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JP2003092798

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DESCRIPTION JP2003092798
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
apparatus having an audio reproduction function in an information apparatus or electronic
apparatus driven by a battery other than an AC power source such as a portable information
terminal, and an audio reproduction control method thereof. is there.
[0002]
BACKGROUND OF THE INVENTION Conventional PDAs, so-called portable information tools
(terminals), manage personal information such as schedules, addresses, memos, ToDos (lists of
items to be done: action list), etc. There are almost all forms in which tools (terminals), personal
computers, and external networks are communicably connected and their information is shared.
In other words, it was mainly used to manage personal information.
[0003]
However, with the progress of various device technologies, users are increasing the screen size,
making the device itself thinner and lighter, increasing the storage capacity, and making the
battery thinner, larger and longer in life, etc. In addition to the diversification of tastes, the
demand for various applications has been required.
[0004]
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For example, with a portable information tool (terminal), "Can I not see a book?" Or "Can I listen
to music?", "Reservation of various tickets through the Internet, shopping, acquisition of various
information, personal information Requests such as "can't be managed" etc. correspond to it.
[0005]
In particular, music information is stored (recorded) on a cassette tape, a CD (compact disc), an
MD (mini disc) or the like, which is reproduced by a small device (small stereo) to be used as an
earphone or the like. Conventionally, listening via headphones has been made, and with advances
in technology, there has been a demand for the above-mentioned portable information tool
(terminal) for managing personal information to realize such a function.
[0006]
Therefore, the technology of a small music player (only playable, both play and recordable) can
be incorporated into a portable information tool (terminal) to manage personal information and
an information device or equipment that satisfies personal preferences. Development of
electronic devices has come to be done.
[0007]
At the time of development, there was no problem by simply combining the two functions
without any restriction conditions. However, in order to realize functions requested by the user,
such as lightness, thinness, smallness, and sound quality, various problems may occur. An issue
has occurred.
[0008]
In recent years, with regard to music, stereo-compatible audio encoding method MP3 (MPEG
(Moving Picture Experts Group) 1 AudioLayer III), which achieves high quality and high
compression ratio as compared to the conventional audio compression encoding method, has
been developed. It is adopted.
As a result, music distribution via a single recording medium or a network such as the Internet
has been easily realized.
Although this MP3 uses perceptual coding and the code data in the original signal and the
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reproduced signal are different, when it is heard by the human ear, the frequency band and the
height of the sound that can be handled by the human ear are It is a coding processing method
that makes it sound the same by making effective use of it.
[0009]
In order to realize music reproduction in accordance with the stereo compatible audio coding
method such as MP3, it is necessary to have a dedicated chip for sound reproduction.
Such a chip for voice reproduction (IC chip) has been expensive, but recently, it has been
installed in small devices, and the price has been lowered.
[0010]
Therefore, the portable information tool (terminal) is also being mounted.
[0011]
At the present time, in the information apparatus including the portable information tool
(terminal) as described above, the MP3 technology has become an indispensable function for
performing voice reproduction. .
Therefore, when playing back MP3, it can be said that the stereo function is essential.
[0012]
However, a chip for stereo sound reproduction (IC chip) for stereo reproduction of MP3 is not
suitable for reproduction of "effect sound such as key input sound or touch input sound" which
consumes a large amount of current and is usually used. is there.
[0013]
However, since the conventional apparatus emphasizes the lightness, thinness, and smallness,
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particularly in terms of size and cost, it has been necessary to devise measures to reduce the
power consumption in the peripheral circuits.
Therefore, even when playing key sounds and touch input sounds that do not require sound
quality, only a chip for stereo playback (IC chip) with a large current consumption is mounted,
and this chip is driven to function as an audio playback function. Was realized.
[0014]
The present invention has been made to solve the problems of the above-mentioned prior art in
view of the above situation, and the object of the present invention is to use a battery-powered
portable telephone instead of an AC power supply. For information equipment including
information tools (terminals), when playing a sound requiring sound quality, the chip for stereo
playback (IC chip) is driven to reproduce the sound, and the key sound or the like which does not
require the sound quality An information device having an audio reproduction function of a
power saving design capable of reducing the consumption current which can be reproduced
without driving a stereo reproduction chip (IC chip) which consumes a large amount of current at
the time of reproduction of touch input sound etc. It is to provide a method.
[0015]
According to the present invention, there is provided an information device having an audio
reproduction function according to the present invention comprising: input means for inputting
data and operation of the device; display means for displaying data and displaying operation
guidance; A storage unit for storing character data and audio data, an audio reproduction unit for
reproducing audio data stored in the storage unit, and an audio output unit for reproducing the
audio by the audio reproduction unit; An information device apparatus comprising an audio
reproduction function, the audio reproduction means comprising: monaural audio reproduction
processing means for reproducing monaural audio; stereo audio reproduction processing means
for reproducing stereo audio; Monaural-stereo audio reproduction selecting means, the input
being performed in a state where the name of the audio data stored in the storage means is
displayed on the display means When the name of the desired audio data is selected and
specified by the stage, the monaural-stereo audio reproduction selecting means searches the
specified audio data for the reproduction type included in the attribute information, and the
search result, When the reproduction type is stereo reproduction type, processing of this audio
data is performed by the stereo sound reproduction processing means to generate stereotype
reproduction sound, and in the case of monaural reproduction type, the monaural sound
reproduction processing means If it is possible to process this audio data, the monaural audio
reproduction processing means processes this audio data to generate a monaural type
reproduction sound, and if this is not possible The present invention is characterized in that a
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monaural type reproduction sound is generated by processing the sound data in the stereo sound
reproduction processing means.
[0016]
The information apparatus having the voice reproduction function according to the present
invention further comprises a headphone use / non-use determination means, in a state where
the name of the voice data stored in the storage means is displayed on the display means. When
the desired audio data name is selected and specified by the input means, the headphone use /
non-use determination means determines whether the headphones are in use and it is
determined that the headphones are not in use. In the case where it is determined that the
playback is cut and the headphones are used, the monaural-stereo audio playback selecting
means searches the specified audio data for a playback type included in the attribute
information. If the search result indicates that the reproduction type is stereo reproduction type,
the stereo sound reproduction processing means processes the sound data. To generate
stereotype reproduction sound, and in the case of monaural reproduction type, the monaural
sound reproduction processing means judges whether or not processing of this sound data is
possible, and when possible, the monaural sound reproduction processing means By processing
the audio data by means, a monaural type reproduction sound is generated, and if not possible,
the monaural type reproduction sound is processed by processing the audio data in the stereo
sound reproduction processing means. It is characterized by generating.
[0017]
The information apparatus having the audio reproduction function of the present invention
further has a reproduction type as a result of searching for the reproduction type included in the
attribute information for the audio data designated by the monaural-stereo audio reproduction
selection means. In the case of stereo reproduction type, the monaural sound reproduction
processing means determines whether or not the processing of the sound data is possible, and
when possible, the monaural sound reproduction processing means performs the processing of
the sound data. In this case, the reproduction of the monaural type is generated, and if it is not
possible, the stereo sound reproduction processing means processes the sound data to generate
the reproduction of the stereotype.
[0018]
The audio reproduction control method in the information apparatus having the audio
reproduction function of the present invention comprises an input step for inputting data and an
operation of the apparatus, a display step for displaying data and displaying operation guidance,
and character data And information storage device having an audio reproduction function
including a storage step of storing audio data, an audio reproduction step of reproducing the
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stored audio data, and an audio output step of reproducing the reproduced audio to produce the
audio The audio reproduction control method according to claim 1, wherein the audio
reproduction step includes a monaural audio reproduction processing step for reproducing
monaural audio, a stereo audio reproduction processing step for reproducing stereo audio, and
monaural-stereo audio reproduction. A selection step, and the name of the audio data stored in
the storage step is displayed in the display step When a desired audio data name is selected and
specified in the input step in the above state, the reproduction included in the attribute
information for the specified audio data in the monaural-stereo audio reproduction selection step
The type is searched, and if the reproduction type is the stereo reproduction type, stereophonic
reproduction sound is generated by processing the audio data in the stereo sound reproduction
processing step, and the monaural reproduction type is generated. In this case, it is determined in
the monaural sound reproduction processing step whether or not processing of the sound data is
possible, and if possible, processing of the sound data is performed in the monaural sound
reproduction processing step. A reproduction sound is generated, and if it is not possible,
processing of the sound data is performed in the stereo sound reproduction processing step.
Generating a reproduced sound Rutaipu, characterized in that.
[0019]
The audio reproduction control method in the information apparatus having the audio
reproduction function of the present invention further includes a step of judging whether or not
headphones are used, and the name of the audio data stored in the storage step is the display
step When a desired audio data name is selected and specified in the input step while displayed
in the step, it is determined whether the headphone is used or not in the headphone used /
unused determination step, and the headphone is determined. Is judged not to be used, playback
is cut, and if it is judged that headphones are used, the attribute for this designated sound data is
selected in the monaural-stereo sound reproduction selection step. Search for the playback type
included in the information, and as a result of the search, if the playback type is stereo playback
type, the stereo sound By processing this audio data in the reproduction processing step, a
stereotype reproduction sound is generated, and in the case of the monaural reproduction type, it
is determined whether or not processing of this audio data is possible in the monaural sound
reproduction processing step. If possible, processing of this audio data is performed in the
monaural sound reproduction processing step to generate monaural type reproduction sound,
and if not possible, the sound data of the audio data is generated in the stereo sound
reproduction processing step. The processing is characterized in that a monaural type of
reproduced sound is generated.
[0020]
According to the audio reproduction control method in the information apparatus having the
audio reproduction function of the present invention, the reproduction type included in the
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attribute information for the audio data designated by the monaural-stereo audio reproduction
selection step is further searched. As a result, when the reproduction type is stereo reproduction
type, it is further judged whether the processing of the audio data is possible in the monaural
audio reproduction processing step, and if possible, the audio is processed in the monaural audio
reproduction processing step. It is characterized in that a monaural type reproduction sound is
generated by processing data, and if it is not possible, a stereotype reproduction sound is
generated by processing this audio data in the stereo sound reproduction processing step. I
assume.
[0021]
BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of an information apparatus
having an audio reproduction function according to the present invention and an audio
reproduction control method thereof will be described in detail with reference to the drawings.
[0022]
In this specification, as an information device having a voice reproduction function, a portable
information tool (hereinafter referred to as a portable information terminal) will be described for
easy understanding. Is not limited to this, and may be another personal computer or other
information processing apparatus.
Further, with regard to the communication function, although it is desirable to include it, it is not
always necessary, so in the drawings used in the following description, the description of the part
of the communication function connectable to the outside is omitted.
[0023]
Further, in the present invention, the target music data for reproduction is intended for general
audio data including data of MPEG audio, but in order to make the explanation easy to
understand, in the following description, recently, A description will be given by taking, as an
example, commonly used MPEG1 audio data (for example, MP3).
[0024]
FIG. 1 is an image diagram showing the appearance of an information apparatus provided with
an audio reproduction function according to the present invention.
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[0025]
As shown in the figure, 1 is an information device and 2 is a headphone.
Reference numeral 11 denotes an input unit such as an input button or a keyboard, and 12
denotes a display unit.
The display unit 12 may be an LCD capable of only displaying, or may be a display integrated
type having a tablet function.
For example, in the case of a display integrated type tablet, an input can be made with a pen or
the like, and this part can be made to function as an input means together with the input unit 11.
[0026]
[0026] In the conventional reproduction of sound, music is mainly reproduced in pursuit of
sound quality (high quality) such as the following two types · MP3 · Sound and alarm by user's
input confirmation There is a connotation of playing a sound by a system that informs the user
such as a sound.
Any of these can hear the sound reproduced from the built-in speaker or headphones, but in the
case of music information using MP3 etc., stereo compatible audio coding that originally achieves
high quality and high compression ratio Because it is recorded by the system, when playing back
and listening to music, use headphones that sound quality (high quality) is good enough for
stereo playback, while playing back rather than sound quality such as an alarm to "notify" It can
be roughly divided into functions requiring only reproduction.
[0027]
FIG. 2 is a system configuration diagram of an information device provided with the audio
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reproduction function of FIG.
The same parts as in FIG. 1 are assigned the same reference numerals.
[0028]
Reference numeral 11 denotes the input unit described above, which is used when the user
inputs data from a button, a keyboard, a tablet (touch panel) or the like.
[0029]
Reference numeral 12 denotes the display unit described above, which displays various
information when inputting or inquiring data of various applications (for example, schedule,
address, memo, communication, etc.) which can be executed by the present information device.
While displaying various operation guidances and menus etc. for performing processing of, when
performing music reproduction as MP3-Player, display of the title of the music piece to be
reproduced and various operation guidances and menus etc are displayed .
[0030]
Reference numeral 13 denotes a storage unit, which is a program for executing various
applications (for example, schedule, address, memo, communication, etc.) that can be executed by
the present information device, data necessary for them, and actual data for each application.
(Schedule data, address data, memo data, etc.), a program for reproducing music as an MP3Player, data necessary for them, music data (songs), etc. are stored.
The detailed items will be described later.
[0031]
Reference numeral 14 denotes an audio reproduction unit, which determines whether the music
selected by the user is for stereo reproduction or monaural reproduction, selects which
reproduction function is to be used for reproduction, and is selected The actual audio
reproduction process is performed by the method.
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Actually, the audio reproduction unit 14 is a power-saving monaural sound reproduction
processing unit 141 that reproduces the sound in a monaural system but the sound quality is not
good, and a power-saving function that reproduces an audio in a stereo system. It comprises a
stereo sound reproduction processing unit 142 with high quality, and a stereo-monaural sound
reproduction selection unit 140 which determines and decides which of the monaural system
and the stereo system is to be selected.
In addition to reproducing the sound stored in MP3, the sound reproducing unit 14 reproduces
the corresponding sound also with respect to the generation of the notification sound including
the click sound of the key or button and the alarm sound.
[0032]
An audio output unit 15 is means for externally producing the sound to be reproduced.
As a specific output method, whether the sound is generated from the speaker 151 built in the
main body of the information device 1 or the external output device including the headphone
and the earphone 2 is used.
The headphones and the earphone 2 can be heard by connecting to an external terminal (a
headphone terminal or an earphone terminal, or both terminals may be provided) 152.
It should be noted that whether the sound can be heard from the speaker 151 or from the
headphones 2 is basically the same principle as whether to listen to music from the speakers or
headphones via a conventional sound system such as stereo, and so on Is performed by the
output switching unit 150.
[0033]
A control unit 10 has a function for controlling the above-mentioned various processing units
constituting the information device 1, and the actual control is performed by a program stored in
the storage unit 13. This is realized by the control unit 10 (CPU) performing processing
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according to the following.
For example, when an input is performed by the input unit 11, the control unit 10 instructs the
voice reproduction unit 14 to reproduce a notification sound including click sounds of keys and
buttons by the sound reproduction unit 14, The output unit 15 outputs the sound.
[0034]
FIG. 3 is a conceptual diagram for explaining the main programs and data stored in the storage
unit of FIG.
[0035]
As shown, the storage unit 13 comprises a first memory 131 and a second memory 132.
Here, the first memory 131 is assumed to be a ROM, and the second memory 132 is assumed to
be a RAM.
[0036]
The first memory 131 has a program area and a data area.
[0037]
In the program area, a system control program for controlling the information device itself, an
application program for executing various applications (schedule, address, memo,
communication, etc.) installed in the information device, MP3 Player As various programs such
as an MP3 playback program for executing an application, and a stereo-monaural sound
determination program for determining whether to perform in stereo mode or monaural mode at
the time of audio reproduction of MP3 are stored.
[0038]
In the data area, application-specific fixed data required when executing various applications
(schedule, address, memo, communication, etc.) installed in the information device, when
executing the application as MP3 Player In addition, necessary unique data, various code data
such as characters and symbols, and various data such as a dictionary are stored.
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[0039]
On the other hand, the second memory 132 has a data storage area and a work area.
[0040]
In the data storage area, actual data concerning various applications (schedule, address, memo,
communication, etc.) installed in the information device, alarm data, sound to be reproduced
when executing the application as MP3 Player Data (data of songs) etc. are stored.
[0041]
The work area is a work area for temporarily storing data, executing a system or an application
program, and working area for decoding data when reproducing audio data. used.
[0042]
Although the storage unit 13 is described as being configured by two types of memories in the
above description, the configuration may be one type or three or more types, and has been
described as a ROM and a RAM. Or using a rewritable non-volatile memory.
These are just problems in actual design (it depends on design problems).
[0043]
FIG. 4 is a functional hierarchy diagram hierarchically showing the system of the present
information device.
[0044]
The functional hierarchical structure includes an application layer (application program layer), a
system layer (system software layer), and a hardware layer as shown in the figure.
[0045]
The application layer includes a schedule application AP-11, an address book application AP-12,
a memo pad application AP-13,..., An MP3 player voice reproduction application AP-2, and the
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system layer includes a schedule and an address book. There is an application processing driver
software AP-DS1 for supporting an application of a memo and a memo, and an audio
reproduction driver software AP-DS2 for supporting an MP3 Player audio reproduction
application.
[0046]
The driver software of the system layer is mainly implemented by the control unit 10 in the case
of the driver software AP-DS1 for application processing as the corresponding hardware, and in
the case of the driver software AP-DS2 for sound reproduction. The actual processing is
performed by the monaural sound reproduction processing unit 141 and the stereo sound
reproduction processing unit 142, respectively.
[0047]
FIG. 5 shows an example of a format in which data items necessary for reproducing MP3 data are
summarized.
[0048]
The audio reproduction application AP2 shown in FIG. 4 has a data bit length, sampling which is
a basic element (information of a header portion of audio data) included from within the data for
audio reproduction including audio data to be reproduced. The format of the data item as shown
in FIG. 5 is generated by checking the rate, stereo-mono type, etc., and the generated items (file
name 5-1, song name 5-2, data bit length, sampling rate 5- 4. Pass the playback type 5-5) as a
parameter to the lower layer audio playback driver software AP-DS2, and the audio playback
driver software AP-DS2 uses the corresponding hardware based on the delivered parameters.
Realize audio playback.
[0049]
Specifically, based on the information of the reproduction type 5-5 shown in FIG. 5, the monaural
sound reproduction processing unit 141 in the monaural type and the stereo sound reproduction
processing unit 141 in the stereo type. By activating each, the target audio is reproduced.
[0050]
Incidentally, the data items shown in FIG. 5 are not limited to the items listed here, and other
items which are originally included in the audio data are included if necessary. May be
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Also, the file name 5-1 here may be data as one of input parameters handled by the application.
Also, the song title 5-2 here may be data as one of the input parameters handled by the
application, or may be data stored in a tag included in the audio data. .
[0051]
Next, the specific process flow will be described in detail.
[0052]
(First Embodiment) FIG. 6 is a diagram showing the flow of processing when deciding which type
of stereo or monaural to use when reproducing speech.
[0053]
When the MP3 Player audio reproduction application shown in FIG. 4 is selected and its software
is activated, the process of actual audio reproduction is carried out (step S6-1).
In step S6-1, the examination of the header portion of the audio data is performed, and here, the
data items included in the header portion (for example, synchronization pattern, ID, layer,
protection bit, bit rate index, sampling frequency, padding bit, mode) Investigate copyright,
original / copy, etc.) and take out the minimum necessary information when playing sound.
In this case, the data length is taken out of the bit rate index, the sampling rate is taken out of the
sampling frequency, and the reproduction type is taken out of the mode.
[0054]
In step S6-1, based on the extracted information, it is determined whether the reproduction type
is monaural or stereo.
[0055]
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If the result of discrimination of the reproduction type is stereotype, the process proceeds to step
S6-3, and the stereo reproduction processing unit 142 is selected.
Thereafter, in step S6-4, the stereo reproduction processing unit 142 reproduces the
corresponding audio data as stereo sound.
[0056]
On the other hand, if the discrimination result of the reproduction type is not stereotype, the
process goes to step S6-5.
In step S6-5, it is determined whether the target sound can be reproduced by the monaural
reproduction processing unit 141 or not.
This determination criterion, that is, the determination as to whether reproduction is possible by
the monaural reproduction processing unit is performed by the sampling rate, the bit width, and
the like.
For example, in the case of sampling rate, it is possible if the frequency is 22 KHz or less, but if
the frequency is higher than that, it can not be processed by the monaural reproduction
processing unit (in the case of an actual audio reproduction component (IC chip) etc. This is
because IC chips for reproduction often do not support high sampling rates.
[0057]
If the result of determination is that reproduction is possible, the process proceeds to step S6-6,
where the monaural reproduction processing unit 141 is selected.
Thereafter, in step S6-7, the monaural reproduction processing unit 141 reproduces the
corresponding audio data as monaural audio.
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[0058]
On the other hand, when the reproduction can not be performed, the process proceeds to step
S6-8, and the stereo reproduction processing unit 142 is selected.
Thereafter, in step S6-9, the stereo reproduction processing unit 142 reproduces the
corresponding audio data as monaural audio.
[0059]
Incidentally, "the stereo reproduction processing unit 142 reproduces the corresponding audio
data as monaural sound.
"" Is realized by flowing the same voice to the left (L) and right (R) channels (L channel (Lch) and
R channel (Rch)) of stereo voice.
[0060]
Thus, since stereo sound and monaural sound are reproduced according to the optimum
judgment criteria, a power saving design can be realized in which power consumption is reduced
at the time of sound reproduction (more power saving can be achieved).
[0061]
The means and method for determining whether the reproduction type is monaural or stereo
type is actually executed by the stereo-monaural sound determination program of FIG. 3 by the
control unit 10 shown in FIG. Switching between the reproduction processing unit 142 and the
monaural sound reproduction processing unit 141 is realized by being switched and set by the
stereo-monaural sound reproduction selection unit 140.
[0062]
Second Embodiment FIG. 7 is a diagram showing another processing flow when deciding which
type of stereo or monaural type to use when reproducing audio.
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[0063]
Most information devices including portable information tools (terminals) have a configuration in
which stereo reproduction is performed from the headphone terminal 152 but only monaural
reproduction is possible from the speaker 151.
This makes it physically impossible to incorporate two speakers for stereo reproduction in order
to make the apparatus itself as small as possible, and to install a speaker with a sufficiently high
sound quality on a small information device. Because it is
Therefore, when the headphones 2 are not in use, the reproduction from the headphone terminal
152 can be cut.
[0064]
The flow of processing will be described while comparing the contents of the present
embodiment with the first embodiment.
[0065]
When the MP3 Player audio reproduction application shown in FIG. 4 is selected and its software
is activated, the process of actual audio reproduction is carried out (step S7-1).
In step S7-1, the header part of the audio data is examined, and here, the data items included in
the header part (for example, synchronization pattern, ID, layer, protection bit, bit rate index,
sampling frequency, padding bit, mode) Investigate copyright, original / copy, etc.) and take out
the minimum necessary information when playing sound.
In this case, the data length is taken out of the bit rate index, the sampling rate is taken out of the
sampling frequency, and the reproduction type is taken out of the mode.
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[0066]
Next, in step S7-2, it is determined whether or not the headphones 2 are to be used.
Here, the determination as to whether or not headphones are used is made by the control unit 10
checking whether the external terminal 152 is in a conductive state via the output switching unit
150 of the audio output unit 15.
The above-mentioned judging means and method are based on the same principle as the
conventional audio equipment.
[0067]
When the headphone 2 is not used, the process proceeds to step S7-3, and the reproduction from
the headphone terminal 152 is cut.
On the other hand, when using the headphones 2, the process proceeds to step S7-4.
[0068]
In step S7-4, it is determined whether the reproduction type is monaural or stereo based on the
extracted information.
This is to check whether or not stereo reproduction is made because there is reproduction from
the built-in monaural speaker.
[0069]
If the result of discrimination of the reproduction type is stereotype, the process goes to step S75, and it is determined whether the audio of this stereotype can be reproduced by the monaural
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reproduction processing unit 141 or not.
This is a point in which the power saving monaural reproduction processing unit 141 is
examining whether or not reproduction is possible.
[0070]
The judgment criteria in the above examination, that is, the judgment as to whether or not
reproduction is possible by the monaural reproduction processing unit are made by the sampling
rate, the bit width and the like. For example, in the case of sampling rate, it is possible if the
frequency is 22 KHz or less, but if the frequency is higher than that, it can not be processed by
the monaural reproduction processing unit (in the case of an actual audio reproduction
component (IC chip) etc. This is because IC chips for reproduction often do not support high
sampling rates.
[0071]
Although the process of step S7-5 is not provided in the first embodiment, it can be incorporated
before step S6-3 of the first embodiment if necessary to realize the same function. You may
[0072]
If the result of determination is that reproduction can not be performed, the process proceeds to
step S7-6, and the stereo reproduction processing unit 142 is selected as usual.
Thereafter, in step S7-7, the stereo reproduction processing unit 142 reproduces the
corresponding audio data as stereo sound.
[0073]
On the other hand, if the reproduction is possible, the process proceeds to step S7-8, and the
monaural reproduction processing unit 141 is selected. Thereafter, in step S7-9, the monaural
reproduction processing unit 141 reproduces the corresponding audio data as monaural audio.
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[0074]
In this case, since the original audio data is stereo audio data, only the L channel (Lch) is
reproduced, or both L channel (Lch) and R channel (Rch) audio (data) Are synthesized, divided
into halves, pseudo-processed into monaural data, and reproduced as this data to obtain
monaural sound. The hardware is realized by adding digital data of L channel (Lch) and R
channel (Rch) by OR processing and dividing into half using a shift register.
[0075]
By adding this judgment process, in order to realize a power saving design in which the current
consumption is reduced at the time of reproducing the sound, the key input sound and the input
sound of the touch use monaural data as much as possible. It is necessary to prepare rate data.
[0076]
On the other hand, if it is determined in step S7-4 that the reproduction type discrimination
result is not stereotype, the process proceeds to step S7-10.
In step S7-10, it is determined whether the target sound can be reproduced by the monaural
reproduction processing unit 141 or not. The judgment criteria here are considered to be the
same as in the case of step S7-5.
[0077]
If the result of determination is that reproduction is possible, the process proceeds to step S7-11,
and the monaural reproduction processing unit 141 is selected. Thereafter, in step S7-12, the
monaural reproduction processing unit 141 reproduces the corresponding audio data as
monaural audio.
[0078]
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On the other hand, when the reproduction can not be performed, the process proceeds to step
S7-13, and the stereo reproduction processing unit 142 is selected. Thereafter, in step S7-14, the
stereo reproduction processing unit 142 reproduces the corresponding sound data as monaural
sound.
[0079]
Incidentally, “the stereo reproduction processing unit 142 reproduces the corresponding audio
data as monaural sound. "" Is realized by flowing the same voice to the L channel (Lch) and R
channel (Rch) of stereo voice.
[0080]
As described above, even if the type of audio to be reproduced is stereo or monaural, the stereo
audio and monaural audio are reproduced based on the optimal judgment criteria. Power design
can be realized (more power saving can be achieved).
[0081]
The means and method for determining whether the reproduction type is monaural or stereo
type is actually executed by the stereo-monaural sound determination program of FIG. 3 by the
control unit 10 shown in FIG. Switching between the reproduction processing unit 142 and the
monaural sound reproduction processing unit 141 is realized by being switched and set by the
stereo-monaural sound reproduction selection unit 140.
[0082]
An information apparatus having an audio reproduction function for realizing the embodiment
described above, that is, the audio reproduction control method thereof actually corresponds to
reproduction by stereo sound and reproduction by monaural sound in terms of hardware. An
audio reproduction process is performed via the IC chip.
However, in reality, these IC chips are equipped with a firmware function, and play a role in DSP
(digital signal processor) and ROM.
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That is, in reality, the intended function is realized by a program.
[0083]
Therefore, the object of the present invention may be a program itself that is functioned by these
devices, or a recording medium in which this program is stored in a computer readable recording
medium.
[0084]
In the present invention, as this recording medium, the processing is performed by the
microcomputer included in the control unit 10 as the control means shown in FIG. 2, the
monaural sound reproduction processing unit 141 or the stereo sound reproduction processing
unit 142. The memory (not shown) such as a ROM, which is necessary to be read, may itself be a
program medium, and a program reader is provided as an external storage device (not shown).
The program medium may be readable by inserting the recording medium into the.
In any case, the stored program may be configured to be accessed and executed by the
microcomputer included in the control means, or in any case the program is read and the read
program is Alternatively, the program may be loaded into a not-shown program storage area of a
microcomputer included in the control means, and the program may be executed. It is assumed
that the loading program is stored in advance in the main device.
[0085]
Here, the program medium is a recording medium configured to be separable from the main unit,
and is a tape system such as a magnetic tape or cassette tape, a magnetic disk such as an FD
(flexible disk) or an HD (hard disk), or a CD- Disk system of optical disk such as ROM / CD-RW /
MO / MD / DVD, card system such as IC card (including memory card) / optical card etc, or
semiconductor memory such as mask ROM, EPROM, EEPROM, flash ROM etc. It may be a
medium fixedly carrying the program.
[0086]
Further, although not shown in the present invention, assuming that the system configuration is
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connectable to a communication network including the Internet, it is a medium that carries the
program in a fluid manner so as to download the program from the communication network. It is
also good.
When the program is downloaded from the communication network as described above, the
download program may be stored in advance in the apparatus main body or may be installed
from another recording medium.
[0087]
The content stored in the recording medium is not limited to the program, and may be data.
[0088]
Next, in the present invention, the program itself is executed by the microcomputer included in
the control unit 10 as the control means shown in FIG. 2, the monaural sound reproduction
processing unit 141 or the stereo sound reproduction processing unit 142. The processing itself
may be performed, or may be acquired or acquired by accessing a communication network
including the Internet, or may be transmitted from here.
Furthermore, it may be the result of processing in the information device of the present
invention, that is, the one generated based on the taken program. Alternatively, it may be
processed as a result of processing in the information device of the present invention when it is
sent out from here, that is, generated.
[0089]
Note that these are not limited to programs, and may be data.
[0090]
From the above contents, the information apparatus having the audio reproduction function and
the audio reproduction control method according to the present invention, 1) the audio
reproduction processing unit, here the parts for audio reproduction corresponding to stereo
sound and monaural sound (IC chip The automatic use of the information equipment device can
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be prolonged by automatically selecting.
That is, since consumption current can be reduced, battery consumption can be reduced, and the
usage time of the entire device can be extended. 2) A reproduction method requiring only a small
amount of current consumption, except when it is really necessary to reproduce in stereo sound,
in which monophonic sound reproduction processing is applied, so that the use time of the
information device is further extended Can. That is, even if audio data of the stereo reproduction
type is capable of monaural reproduction processing, the audio is reproduced by synthesizing the
stereo sound to make monaural sound and performing reproduction processing in the monaural
reproduction processing unit. Can be realized.
[0091]
The contents of the above-described embodiments are not limited to the contents described
above as long as the gist of the present invention is not changed.
[0092]
Industrial Applicability The following effects can be obtained by the information apparatus
having the audio reproduction function and the audio reproduction control method according to
the present invention.
[0093]
There are two types of voices from the conventional "music that pursues sound quality (high
quality) like MP3" and "sound by system to notify user such as sound by user input confirmation
and alarm sound" In any case, it is possible to hear the sound reproduced from the built-in
speakers and headphones, but in the case of music information using MP3 etc., an audio coding
method compatible with stereo that realizes originally high quality and high compression ratio
Because it is recorded in, when playing back and listening to music, use headphones that sound
quality (high quality) is good enough for stereo playback, and play while playing on a sound
quality like alarm etc. It can be roughly divided into functions that require only
[0094]
From the viewpoint of an actual device, for information equipment including portable
information tools (terminals) driven by batteries rather than AC power, a chip for reproducing
stereo (IC chip) when reproducing sound that requires sound quality. When playing back a key
sound or a touch input sound that does not require sound quality, drive a stereo playback chip
(IC chip) that consumes a large amount of current without using it. It is possible to provide an
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information device having an audio reproduction function of power saving design with reduced
power consumption.
[0095]
Brief description of the drawings
[0096]
1 is an image view showing the appearance of an information device provided with an audio
reproduction function according to the present invention.
[0097]
2 is a system configuration diagram of an information device having an audio reproduction
function according to the present invention.
[0098]
3 is a conceptual diagram for explaining the main programs and data stored in the storage unit
shown in FIG.
[0099]
4 is a functional hierarchy diagram hierarchically showing a system of information equipment
provided with an audio reproduction function according to the present invention.
[0100]
<Drawing 5> It is the figure which shows one example of the format which collected the data
item which is necessary for playback with the data of MP3.
[0101]
6 is a flowchart showing the flow of processing when deciding which type of stereo or monaural
to use when playing back audio.
[0102]
FIG. 7 is a flowchart showing another process flow when deciding which type of stereo or
monaural to use when playing back audio.
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[0103]
Explanation of sign
[0104]
Reference Signs List 1 information device 10 control unit 11 input unit 12 display unit 13
storage unit 131 first memory 132 second memory 14 audio reproduction unit 140 stereomonaural audio reproduction selection unit 141 monaural audio reproduction processing unit
142 stereo audio reproduction processing unit 15 audio output Unit 150 Output switching unit
151 Speaker 152 External terminal 2 Headphones
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