JP2007228445

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DESCRIPTION JP2007228445
PROBLEM TO BE SOLVED: To prevent reproduction failure in all reproduction devices while
maintaining constant reproduction quality even if reproduction devices are installed in a plurality
of places in an audio data communication system. SOLUTION: An audio data transmitting
apparatus 1 for transmitting audio data through a power line L, and a plurality of reproduction
speaker apparatuses 2a to 2f capable of receiving and reproducing audio data are provided, and
the reproduction speaker apparatuses 2a to 2f A communication quality data transmission unit
10 that detects the communication quality of the power line L and transmits the communication
quality data to the audio data transmission apparatus 1, and the audio data transmission
apparatus 1 receives the transmitted communication quality data Based on the quality data
receiving unit 11 and the communication quality data, the upper limit of the transmission rate of
audio data reproducible by the reproduction speaker devices 2a to 2f of the minimum number of
reproduction devices set in advance is set, and the transmission rate is less than the upper limit It
has the transmission speed setting part 12 which can be set arbitrarily. [Selected figure] Figure 2
Audio visual data communication system, audio visual data communication method and audio
visual data communication program
[0001]
The present invention relates to an audio visual data communication system, an audio visual data
communication method, and an audio visual data communication program for reproducing audio
visual data through a power line.
[0002]
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1
Conventionally, a speaker system described in Patent Document 1 is known as a technique for
outputting data from an audio data transmitting apparatus to an audio data reproducing speaker
and reproducing the data.
In this speaker system, audio data is transmitted from a single audio data transmitting apparatus
to a plurality of audio data reproducing speakers installed wirelessly. This makes it possible to
play different types of audio data on each speaker.
[0003]
JP 2001-275194 A
[0004]
The following problems remain in the above-mentioned prior art.
That is, the above-mentioned conventional speaker system is premised on reproduction from a
plurality of reproduction speakers in one room, and does not consider that reproduction
speakers are installed in a plurality of rooms and simultaneous reproduction is performed in
each room. For this reason, when the reproduction speaker is installed in a room where the
wireless reception condition is poor, there is a disadvantage that good reproduction can not be
performed. For this reason, there is a technology in which audio data is transmitted to
reproduction speakers of each room and reproduced by power line communication that performs
data communication via a power line arranged in each room, but in this case, It is necessary to
set the transmission speed of audio data low according to the playback speaker installed at the
place with the lowest communication quality because the communication quality of the
transmission line in the power line is not constant due to the influence of other electrical and
electronic devices. The However, when setting to a low transmission rate corresponding to the
lowest communication quality, there has been a problem that the audio reproduction speed is
lowered and the overall audio reproduction quality is lowered. Also, depending on the state of
noise etc., the communication quality may be degraded overall, and if audio data is transmitted at
a higher transmission rate than the communication quality in this state, reproduction failure may
occur in all reproduction devices. .
[0005]
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2
The present invention has been made in view of the above-described problems, and can prevent
reproduction failure in all reproduction devices while maintaining a constant reproduction
quality even if the reproduction devices are installed at a plurality of locations. An audio visual
data communication system, an audio visual data communication method, and an audio visual
data communication program are provided.
[0006]
The present invention adopts the following configuration in order to solve the problems.
That is, the audio-visual data communication system according to the present invention can
transmit audio-visual data through a power line, receive the audio-visual data through the power
line, can reproduce the audio-visual data, and can be installed in multiple places. And a
communication quality data transmission unit that detects communication quality of a power line
at a place where the reproduction apparatus is installed and transmits the communication quality
data to the transmission apparatus. A communication quality data receiving section for receiving
the communication quality data transmitted from the plurality of reproduction devices, and the
reproduction device having the minimum number of reproduction devices set in advance based
on the received communication quality data. Set the upper limit of the transmission rate of the
audio / visual data that can be set, and set the transmission rate arbitrarily below the upper limit
Characterized in that it has a transmission rate setting unit of capacity, the.
[0007]
In the audio-visual data communication method of the present invention, the transmitting device
transmits the audio-visual data through the power line, and the reproducing device receives the
audio-visual data through the power line. Detecting the communication quality of the power line
at the specified location and transmitting it as the communication quality data to the
transmission device, the transmission device receiving the communication quality data from the
plurality of reproduction devices, and the transmission device Sets an upper limit of the
transmission rate of the audio / visual data that can be reproduced by the reproduction device of
the minimum number of reproduction devices set in advance based on the received
communication quality data, and the transmission rate is arbitrary below the upper limit And
setting the
[0008]
In the audio-visual data communication program of the present invention, the transmitting device
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transmits the audio-visual data through the power line, and the reproducing device receives the
audio-visual data through the power line. Detecting the communication quality of the power line
at the specified location and transmitting the communication quality data to the transmission
device; the transmission device receiving the communication quality data transmitted from the
plurality of reproduction devices; and the transmission Based on the received communication
quality data, the apparatus sets an upper limit of the transmission speed of the audio / visual
data that can be reproduced by the reproduction apparatus of the minimum number of
reproduction apparatuses set in advance, and the transmission speed below the upper limit And a
step of arbitrarily setting the computer.
[0009]
In these audio-visual data communication system, audio-visual data communication method, and
audio-visual data communication program, the transmitter sets the minimum number of
reproduction devices set in advance based on communication quality data received from a
plurality of reproduction devices. By setting the upper limit of the transmission rate of audio /
visual data that can be reproduced by the reproduction device and arbitrarily setting the
transmission rate below the upper limit, reproduction is maintained in at least the minimum
number of reproduction devices, and It is possible to arbitrarily set the reproduction quality
while securing the number of reproduction devices.
That is, in the reproduction apparatus having low communication quality which can not cope
with the set transmission rate, reproduction failure occurs and the state is masked, but in the
reproduction apparatus having communication quality compatible with the set transmission rate,
transmission is performed. Good reproduction is performed at audio reproduction quality
(reproduction speed) corresponding to the speed.
At this time, since the transmission speed is set so as not to exceed the upper limit that can
secure the minimum number of reproduction devices, reproduction failure occurs in all the
reproduction devices even if the overall communication quality is deteriorated due to noise or the
like. It can prevent. The audio / visual data refers to at least one of audio data and visual data.
[0010]
In the audio-visual data communication system according to the present invention, the
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reproduction apparatus further includes a minimum transmission rate input unit capable of
inputting the minimum transmission rate of the audio-visual data, and the communication quality
data transmission unit is the minimum transmission The communication quality data receiving
unit has a function of transmitting the minimum transmission rate input by the rate input unit to
the transmission device via a power line, and the communication quality data reception unit
receives the minimum transmission rate transmitted from the reproduction device. The
transmission rate setting unit may have a function of sending the minimum transmission rate to
the transmission rate setting unit, and the transmission rate setting unit may set the transmission
rate above the minimum transmission rate that has been sent. That is, in this audio-visual data
communication system, the minimum transmission rate can be input on the playback device side,
and the input minimum transmission rate is sent to the transmission device via the power line,
whereby the transmission rate is set above the minimum transmission rate. Therefore, the viewer
on the playback apparatus side can set an arbitrary minimum playback quality below the upper
limit transmission rate based on the minimum number of playback apparatuses. Therefore, it is
possible to maintain the reproduction quality of the level required by the viewer on the
reproducing apparatus side while avoiding the reproduction failure of the entire reproducing
apparatus.
[0011]
According to the present invention, the following effects are achieved. That is, according to the
audio-visual data communication system, the audio-visual data communication method, and the
audio-visual data communication program according to the present invention, the minimum
reproduction device set in advance based on communication quality data received from a
plurality of reproduction devices By setting the upper limit of the transmission speed of audio /
visual data that can be reproduced by a number of reproduction devices, and optionally setting
the transmission speed below the upper limit, constant communication can be performed while
securing the minimum number of reproduction devices required Good reproduction can be
performed in another reproduction apparatus in a state in which the reproduction apparatus
installed at a location lower than the quality is masked. Therefore, even if the playback devices
are installed at a plurality of locations, it is possible to prevent a playback failure in all the
playback devices while maintaining an arbitrary playback quality.
[0012]
Hereinafter, one embodiment of an audio visual data communication system, an audio visual data
communication method, and an audio visual data communication program according to the
present invention will be described with reference to FIGS. 1 to 3.
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[0013]
As shown in FIG. 1, the audio data communication system according to the present embodiment
is, for example, audio data of a CD player or the like through a power line L which is wired in a
general house or the like and supplies electric power to electronic appliances such as a plurality
of home appliances. The audio data transmitted from the transmission device (transmission
device) 1 is reproduced by reproduction speaker devices (reproduction devices) 2a to 2f installed
in a plurality of rooms (locations).
[0014]
The audio data communication system is provided in an audio data transmitting apparatus 1 for
transmitting audio data via a power line L, capable of receiving and reproducing audio data via
the power line L, and installed in a room partitioned by a wall W. And a plurality of reproduction
speaker devices 2a to 2f.
[0015]
In each of the above-mentioned rooms, a plurality of outlets 4 for obtaining power from the
power line L are installed.
The audio data transmitting apparatus 1 is connected to an outlet 4 in one room, as shown in
FIG. 2, and transmits packets transmitted through the power line L based on audio data read
from a storage medium such as a CD. A data generation unit 5 to be generated, and a data
transmission unit 6 to transmit packets of audio data generated by the data generation unit 5 via
a power line L are provided.
The reproduction speaker devices 2a to 2f are a data reception unit 7 that receives packets of
audio data via a power line L, an audio data reproduction unit 9 that reproduces and outputs
audio data from the speaker unit 8 based on the received packets, Is equipped.
[0016]
Further, the reproduction speaker devices 2a to 2f detect the communication quality of the
power line L at the installation position from the reception state of the test-transmitted audio
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data by the data reception unit 7, and transmit the communication quality data to the audio
transmission device 1. The communication quality data transmission unit 10 is provided.
The audio data transmitting apparatus 1 is the communication quality data receiving unit 11 for
receiving the communication quality data transmitted from the plurality of reproducing speaker
apparatuses 2a to 2f, and the minimum number of reproducing apparatuses set in advance based
on the received communication quality data. The transmission speed setting unit 12 sets the
upper limit of the transmission speed of the audio data reproducible by the reproduction speaker
apparatuses 2a to 2f (the minimum number of reproduction speaker apparatuses), and can
arbitrarily set the transmission speed below the upper limit. doing.
[0017]
Furthermore, the reproduction speaker devices 2a to 2f are provided with a minimum
transmission rate input unit 21 to which the minimum transmission rate of audio data can be
input. Further, the communication quality data transmitting unit 10 has a function of
transmitting the lowest transmission rate inputted by the lowest transmission rate input unit 21
to the audio data transmitting apparatus 1 via the power line L. The minimum transmission rate
input unit 21 can select a transmission rate corresponding to Modes 1 to 5 described later by, for
example, a knob provided on the front of the reproduction speaker devices 2a to 2f. Further, the
communication quality data receiving unit 11 has a function of receiving the minimum
transmission rate transmitted from the reproduction speaker devices 2 a to 2 f and transmitting
the minimum transmission rate to the transmission rate setting unit 12. The transmission rate
setting unit 12 has a function of setting the transmission rate at the minimum transmission rate
or more.
[0018]
Each processing unit of data in this audio data communication system, that is, data transmission
unit 6, data generation unit 5, communication quality data transmission unit 10, communication
quality data reception unit 11, transmission rate setting unit 12, data reception unit 7, The audio
data reproduction unit 9 or the like may be realized by dedicated hardware, and each processing
unit is constituted by a memory and a CPU (central integrated device) as a computer system, and
functions of each processing unit and The function may be realized by loading a program for
realizing the audio data communication method of the present embodiment described later into a
memory and executing the program.
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[0019]
That is, the above program is a computer readable program, and may be for realizing the abovedescribed functions and part of the audio data communication method described later.
Furthermore, the program may be a so-called difference file (difference program) that can realize
the above-described function in combination with a program already recorded in the computer
system.
[0020]
The program may be transmitted from a computer system in which the program is stored in a
storage device or the like to another computer system via a transmission medium or by
transmission waves in the transmission medium. The transmission medium is a medium having a
function of transmitting information, such as a network (communication network) such as the
Internet, a power line, and a communication line (communication line) such as a telephone line.
The memory is a nonvolatile memory such as a hard disk drive, a magneto-optical disk drive, a
flash memory, etc., a recording medium such as a CD-ROM which can only be read, or a volatile
memory such as a random access memory (RAM). Alternatively, a computer readable and
writable recording medium according to a combination of these may be used.
[0021]
Next, a communication method and a reproduction method of audio data by the audio data
communication system of the present embodiment will be described.
[0022]
First, audio data is test-transmitted from the data transmission unit 6 of the audio transmission
device 1 to the reproduction speaker devices 2a to 2f via the power line.
Note that this audio data is for test transmission, and may not be ordinary reproduction audio
data by the data generation unit 5 but may be data dedicated to test transmission. The data
reception units 7 of the reproduction speaker apparatuses 2a to 2f in each room receive the
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audio data subjected to test transmission via the power line, and send the received audio data to
the communication quality data transmission unit 10. Then, the communication quality data
transmission unit 10 detects the communication quality from the reception state of the received
audio data.
[0023]
For example, the transmission quality is changed from the data transmission unit 6 to five levels
(Mode 1 to High Transmission Rate 1 to Mode 5 to Low Transmission Rate), test transmission of
audio data is performed, and the communication quality data transmission unit 10 is shown in
FIG. The communication quality is evaluated in five stages (Mode 1 to Mode 1 of high
communication quality and Mode 5 of low communication quality) from the reception state, and
is used as the communication quality data of the reproduction speaker devices 2a to 2f.
[0024]
Furthermore, the communication quality data transmission unit 10 of each of the reproduction
speaker devices 2a to 2f transmits the detected communication quality data to the audio
transmission device 1 via the power line L.
The communication quality data receiving unit 11 of the audio transmitting apparatus 1 receives
the communication quality data via the power line L and sends the communication quality data
to the transmission rate setting unit 12. The transmission speed setting unit 12 sets the upper
limit of the transmission speed of audio data that can be reproduced by the reproduction speaker
devices 2a to 2f of the minimum reproduction device number set in advance based on all
communication quality data of the reproduction speaker devices 2a to 2f. And set the
transmission rate arbitrarily below the upper limit. As the minimum number of reproduction
devices, an operator such as a user arbitrarily sets the minimum number of reproduction speaker
devices required for the minimum reproduction.
[0025]
Next, the transmission rate setting unit 12 sends the determined transmission rate data to the
data transmission unit 6, and the data transmission unit 6 transmits the audio data sent from the
data generation unit 5 through the power line L according to the determined transmission rate.
To the reproduction speaker devices 2a to 2f. And in each reproduction | regeneration speaker
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apparatus 2a-2f, although the data receiving part 7 receives audio data via the power line L, the
thing with the communication quality which can respond to the determined transmission rate is
the audio data reproducing part 9 Audio data is satisfactorily reproduced and output from the
speaker unit 8. On the contrary, in each of the reproduction speaker devices 2a to 2f, the data
reception unit 7 can not completely receive the audio data, and the audio data reproduced by the
audio data reproduction unit 9 can not be received. A data reproduction failure occurs and is
masked.
[0026]
For example, as shown in FIG. 3A, the communication quality data is Mode 1 in the reproduction
speaker device 2a, Mode 2 in the reproduction speaker device 2b, Mode 2 in the reproduction
speaker device 2c, Mode 3 in the reproduction speaker device 2d, and the reproduction speaker
device 2e If Mode 3 and Mode 4 of playback speaker device 2f are detected, the user sets at least
the number of playback speaker devices that the user wants to play at least, ie, the minimum
number of playback devices, to three transmission speed setting units 12 The transmission rate
is determined to be Mode 2 so that reproduction can be maintained. As a result, the three
reproduction speaker devices 2a, 2b and 2c can be reproduced, and the three reproduction
speaker devices 2d, 2e and 2f are in a state of being reproduced defectively and masked. In this
case, the transmission speed setting unit 12 is set to be the highest transmission speed while
securing the minimum number of reproduction devices.
[0027]
Also, as shown in FIG. 3B, the communication quality data is Mode 1 for the reproduction
speaker device 2a, Mode 3 for the reproduction speaker device 2b, Mode 3 for the reproduction
speaker device 2c, Mode 3 for the reproduction speaker device 2d, and the reproduction speaker
device 2e. If Mode 3 and Mode 4 of playback speaker device 2f are detected, if the minimum
number of playback devices is set to 3, the transmission speed setting unit 12 sets the
transmission speed so that three or more can be maintained for playback. Move down one rank
to determine Mode 3. As a result, five reproduction speaker devices 2a, 2b, 2c, 2d, and 2e can be
reproduced, and only one reproduction speaker device 2f is in a state of being reproduced
defectively and masked.
[0028]
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If the set minimum number of playback devices can be secured, the user arbitrarily selects the
playback quality on the condition that the minimum number of playback devices is maintained,
and the transmission speed setting unit is set to have communication quality and transmission
speed corresponding to the playback quality. 12 may be set. For example, as shown in FIG. 3A,
when the communication quality in each of the reproduction speaker devices 2a to 2f is detected,
if the user sets the minimum number of reproduction devices as one, the user can select one of
modes 1 to 4 It is possible to select the reproduction quality corresponding to the
communication quality of
[0029]
That is, if the reproduction quality corresponding to the communication quality of Mode 1 is
selected, one of the reproduction speaker devices 2a can be reproduced, and if the reproduction
quality corresponding to the communication quality of Mode 2 is selected, the reproduction
speaker devices 2a, 2b and 2c are selected. Three will be playable. Furthermore, if the
reproduction quality corresponding to the communication quality of Mode 3 is selected, five
reproduction speaker apparatuses 2a, 2b, 2c, 2d and 2e can be reproduced. Furthermore, if
reproduction quality corresponding to the communication quality of Mode 4 is selected,
reproduction becomes possible with all the reproduction speaker devices 2a to 2f. All of these
settings satisfy the minimum number of reproduction devices. In the above setting, since all the
reproduction speaker devices 2a to 2f cause reproduction failure, Mode 5 can not be selected.
Therefore, while securing the minimum number of reproduction devices, it is possible to
reproduce with any number of reproduction speaker devices and sound quality.
[0030]
When a user (viewer) on the reproduction speaker devices 2a to 2f obtains a reproduction
quality of a certain level or more, the user corresponds to the reproduction quality at the
minimum transmission speed input unit 21 on the reproduction speaker devices 2a to 2f. When
the transmission rate is input, the communication quality data transmission unit 10 transmits the
input lowest transmission rate to the audio transmission apparatus 1 via the power line L as
transmission data. In the audio transmitting apparatus 1, the communication quality data
receiving unit 11 receives the lowest transmission rate via the power line L and sends
information on the lowest transmission rate to the transmission rate setting unit 12. Then, the
transmission rate setting unit 12 sets the mode corresponding to the transmission rate higher
than the minimum transmission rate sent below the upper limit Mode (transmission rate) based
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on the minimum number of reproduction apparatuses, thereby making the user's request The
minimum reproduction quality can be maintained.
[0031]
As described above, since the transmission rate is set above the lowest transmission rate, the user
who is on the reproduction speaker devices 2a to 2f does not have any lowest reproduction
under the upper limit Mode (transmission speed) based on the minimum number of reproduction
devices. You can set the quality. Therefore, it is possible to maintain the reproduction quality of
the level requested by the user on the reproduction speaker devices 2a to 2f while avoiding the
reproduction failure of the entire reproduction speaker devices 2a to 2f.
[0032]
As described above, in the present embodiment, in the audio data transmitting apparatus 1,
reproduction can be performed by the reproduction speaker apparatuses 2a to 2f having the
minimum number of reproduction apparatuses set in advance based on the communication
quality data received from the plurality of reproduction speaker apparatuses 2a to 2f. By setting
the upper limit of the audio data transmission rate and optionally setting the transmission rate
below the upper limit, the reproduction is maintained at least in the reproduction speaker devices
2a to 2f having the minimum number of reproduction devices, and the minimum number of
reproduction devices The reproduction quality can be set arbitrarily while securing the
[0033]
That is, among the reproduction speaker devices 2a to 2f, the communication quality which can
not correspond to the set transmission speed causes a reproduction failure and is in a masked
state, but among the reproduction speaker devices 2a to 2f, it is set If the communication quality
is compatible with the transmission speed, good reproduction is performed with the audio
reproduction quality (reproduction speed) corresponding to the transmission speed.
At this time, since the transmission speed is set so as not to exceed the upper limit that can
ensure the minimum number of reproduction devices, reproduction failure occurs in all
reproduction speaker devices 2a to 2f even if the overall communication quality is degraded due
to noise or the like. Can be prevented.
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[0034]
In addition, since the mode (transmission speed) is set above the minimum transmission speed
corresponding to the minimum reproduction quality by the user of the reproduction speaker
apparatuses 2a to 2f selecting the minimum reproduction quality, the mode is set based on the
minimum number of reproduction apparatuses. Below the upper limit Mode, any minimum
playback quality can be set. Therefore, it is possible to maintain the reproduction quality of the
level requested by the user on the reproduction speaker devices 2a to 2f while avoiding the
reproduction failure of the entire reproduction speaker devices 2a to 2f.
[0035]
The technical scope of the present invention is not limited to the above embodiment, and various
modifications can be made without departing from the scope of the present invention.
[0036]
Although the above embodiment has described the case of transmitting and receiving audio data
via the power line L, not only audio data but also visual data may be transmitted and received via
the power line L.
In this case, a visual data reproduction apparatus such as a DVD player is employed instead of
the audio data transmission apparatus 1, and a reproduction apparatus such as a liquid crystal
display apparatus is employed instead of the reproduction speaker apparatuses 2a to 2f.
[0037]
FIG. 1 is an overall configuration diagram showing an audio data communication system in an
audio-visual data communication system, an audio-visual data communication method, and an
audio-visual data communication program according to an embodiment of the present invention.
FIG. 2 is a block diagram showing an audio data communication system in the present
embodiment. In this embodiment, it is an explanatory view for showing an audio data
communication method.
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Explanation of sign
[0038]
DESCRIPTION OF SYMBOLS 1 audio data transmitting apparatus (transmitting apparatus) 2a-2f
reproduction speaker apparatus (reproducing apparatus) 10 communication quality data
transmitting section 11 communication quality data receiving section 12 transmission rate
setting section 21 minimum transmission Speed input unit, L: Power line
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