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JPH05206772

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DESCRIPTION JPH05206772
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
loudness apparatus, and more particularly to a car audio system and a home audio system, which
can cope with individual differences when compensating for deterioration of the feeling
characteristic at low volume. About.
[0002]
2. Description of the Related Art The sound sensing characteristics of the human ear have the
property that it is difficult to hear low and high frequencies at low volume levels, and sounds as
sounds of the same magnitude based on the sound pressure level of pure sound at 1000 Hz.
When the sound pressure level at each frequency is measured, an equal loudness curve (equal
sensitivity curve) as shown in FIG. 11 is drawn. In FIG. 11, the lower curve corresponds to the
case where the volume is smaller, and the lowermost curve A1 is the minimum audible limit
(MAF). It can be seen from FIG. 11 that as the volume decreases, the low and high frequencies
become more difficult to hear.
[0003]
The audio system is equipped with a loudness device to compensate for the deterioration of the
sense of touch characteristics at low volume, and when the volume is reduced by volume, the low
and high frequencies are automatically raised appropriately, thus the audio source It makes it
possible to listen with flat frequency characteristics.
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1
[0004]
FIG. 12 shows a conventional audio system with a loudness device.
The audio signal output from the audio source device 10 is subjected to volume adjustment by
the volume adjustment volume 12 and then input to the equalizer 14. The equalizer 14 is
externally controlled to provide audio bands, for example, the first to ninth nine bands (the
center frequencies of the bands are 64 Hz, 125 Hz, 250 Hz, 500 Hz, 1 kHz, 2 kHz, 4 kHz, 8 kHz,
16 kHz, respectively). ) To equalize for loudness control. A volume position signal is output from
the volume 12 to the loudness controller 16 having a microcomputer configuration.
[0005]
In the memory 18 of the loudness controller 16, reference loudness control data (see LD1 to LD9
in FIG. 13) created from the minimum audible limit (MAF) A1 in FIG. However, subscripts are
stored corresponding to the first band to the ninth band, and according to the volume position of
the volume 12, the reference loudness control data of the memory 18 is a coefficient k
(1.gtoreq.k) according to the volume position. ≧ 0, k = 1 if the volume position is from MIN to a
predetermined minimum audible position, and k becomes smaller than 1 as the volume increases
from the minimum audible position. The minimum audible position is a volume position
corresponding to point a in FIG. Is output to the equalizer 14 to perform frequency characteristic
adjustment control to compensate for the deterioration of the sense characteristic that occurs
according to the volume position of the volume 12 at the time of small volume. The audio signal
whose frequency characteristic has been corrected by the equalizer 14 is amplified by the
amplifier 20 and then supplied to the speaker 22 for acoustic reproduction.
[0006]
As a result, when the volume is reduced by the volume 12, the loudness control according to the
volume is automatically applied, so that the user can listen to the audio source under a flat
frequency characteristic even at a small volume.
[0007]
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2
However, in the above-described conventional loudness apparatus, the reference loudness
control data stored in the memory 18 is generally generated based on a person having an
average feeling characteristic. The individual characteristics of the user, such as those who are
better off ear or worse than average, are not considered at all.
It is known that there are large individual differences in the sense of touch characteristics due to
gender differences, age differences, differences in the growth environment, and the like.
[0008]
For example, for a person having a minimum audibility as shown by the broken line B in FIG. 11,
in the loudness control performed by the reference loudness control data based on the solid line
A1, the frequency characteristic flat by the difference between A1 and B in FIG. The sound
reproduction is performed based on the shifted characteristic (see FIG. 14) or the characteristic
similar to the characteristic, and there is a problem that the user can not listen to the music
faithful to the audio source.
[0009]
From the above, it is an object of the present invention to provide a loudness apparatus capable
of coping with individual differences when compensating for deterioration of the sense of touch
characteristics at low volume.
[0010]
According to one aspect of the present invention, the above-mentioned subject is provided by an
equalizer which is provided on the front or rear side of a volume for adjusting the volume of an
audio signal to adjust the frequency characteristic, and the volume. In a loudness apparatus
provided with a loudness controller for performing frequency characteristic adjustment control
to an equalizer using predetermined loudness control data in conjunction with volume
adjustment, measurement instruction means for instructing measurement of individual's feeling
characteristic, and measurement After an instruction to measure an individual's feeling
characteristic is issued by the instruction means, a pure tone generation means for switching and
generating a plurality of pure tone signals relating to a plurality of predetermined frequencies in
the audio band in order every predetermined time To the amplifier while continuously increasing
the level of each pure tone signal output from the inaudible level The audible level reaching
means, the audible level reaching means for indicating that each pure tone reproduced from the
speaker has reached the audible level, and the time when the audible level reaching means is
instructed by the audible level reaching means There is provided a determination means for
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determining personal loudness control data from the level of each pure tone signal, and the
loudness controller performs normal sound reproduction, interlocking with volume adjustment
by volume, the personal loudness at low volume. This is achieved by performing frequency
characteristic adjustment control for the equalizer using the control data.
[0011]
In another embodiment of the present invention, a memory storing predetermined generalpurpose loudness control data for correcting frequency characteristics at low volume, and a front
side or rear side of a volume for volume control of an audio signal. A loudness apparatus
provided with an equalizer for adjusting frequency characteristics, and a loudness controller for
performing frequency characteristic adjustment control on the equalizer using predetermined
loudness control data at a small volume in conjunction with volume adjustment by volume. After
the measurement instruction means for instructing measurement of the individual's feeling
characteristic of the sound and the measurement instruction of the individual's feeling
characteristic are instructed by the measurement instruction means, a plurality of predetermined
frequency in the audio band are sequentially provided at predetermined time intervals A pure
tone generating means for switching and generating a pure tone signal, and a switching from the
pure tone generating means Variable level means for outputting to the amplifier while
continuously increasing the level of each pure tone signal from the inaudible level and an audible
level attainment means for indicating that each pure tone reproduced from the speaker has
reached the audible level The minimum audible limit is determined from the level of the pure
tone signal at each time when the audible level reaching instruction means indicates that the
audible level is reached, and the general-purpose loudness control data stored in the memory
using the minimum audible limit The loudness controller performs frequency characteristic
adjustment control to the equalizer using the corrected loudness control data at the time of small
volume in conjunction with volume adjustment by volume when performing normal sound
reproduction. It is achieved by doing so.
[0012]
According to one aspect of the present invention, when an instruction to measure the feeling
characteristic of an individual is issued, a plurality of pure tone signals relating to a plurality of
predetermined frequencies in the audio band are sequentially generated every predetermined
time. Output to the amplifier while continuously increasing the level of each pure tone signal
from the inaudible level.
Then, personal loudness control data is determined from the level of the pure tone signal at each
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time when it is instructed that each pure tone reproduced from the speaker has reached the
audible level.
Thereafter, when normal sound reproduction is performed, frequency characteristic adjustment
control on the equalizer is performed using personal loudness control data at low volume in
conjunction with volume adjustment by volume.
As a result, loudness control is performed in accordance with the individual user's sense of touch
characteristics, so that the user can listen to music faithful to the audio source under flat
frequency characteristics even at low volume.
[0013]
Further, according to another one of the present invention, when an instruction to measure the
feeling characteristic of an individual is issued, a plurality of pure tone signals relating to a
plurality of predetermined frequencies in the audio band are sequentially generated every
predetermined time. Output to the amplifier while continuously increasing the level of each pure
tone signal from the inaudible level.
Then, the minimum audible limit is obtained from the level of the pure tone signal at each time
when it is instructed that each pure tone reproduced from the speaker has reached the audible
level, and the general-purpose loudness stored in the memory using the minimum audible limit
Correct the control data. When normal sound reproduction is performed, frequency
characteristic adjustment control for the equalizer is performed using the corrected loudness
control data at the time of small volume in conjunction with the volume adjustment by the
volume. Also in this case, loudness control can be performed in accordance with the individual
user's sense of touch characteristics, and the user can listen to music faithful to the audio source
under flat frequency characteristics even at low volume.
[0014]
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is an overall block diagram
of an audio system with a loudness device according to a first embodiment of the present
invention. The same components as in FIG. 12 are denoted by the same reference numerals.
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[0015]
In the figure, 10A is a CD player which is an example of an audio source device, 12 is a volume
for adjusting the volume of the audio signal outputted from the CD player, and also has a
function of outputting a volume position signal representing a volume position. ing. 14 performs
equalization for loudness control on the audio signal after volume adjustment. The equalizer 14
externally controls the audio band, for example, the first to ninth nine bands (the center
frequency of each band is 64 Hz, 125 Hz, 250 Hz, 500 Hz, 1 kHz, 2 kHz, 4 kHz, 8 kHz, 16 kHz).
Adjust the frequency characteristics separately.
[0016]
A loudness controller 16A performs frequency characteristic adjustment control to the equalizer
14, performs general loudness control for a person having an average sound feeling
characteristic, and measures an individual's sound feeling characteristic according to a user's
instruction, It also has a function to perform loudness control according to the individual's sense
of touch characteristics. Reference numeral 18A denotes a memory, and in the memory 18A,
general reference loudness control data (see LD1 to LD9 in FIG. 13) prepared from the average
minimum audible limit (MAF) shown in the curve A1 in FIG. However, the subscripts correspond
to the first band to the ninth band) are stored. In the memory 18A, personal reference loudness
control data matching the user's individual feeling characteristic is also stored, as described later.
[0017]
In accordance with the control of the loudness controller 24, predetermined levels of nine
frequencies of f1 = 64 Hz, f2 = 125 Hz, f3 = 250 Hz, f4 = 500 Hz, f5 = 1 kHz, f6 = 2 kHz, f7 = 4
kHz, f8 = 8 kHz, f9 = 16 kHz A pure tone generator for switching and generating a pure tone
signal, and a level variable circuit for increasing the level of each pure tone signal switched and
output from the pure tone generator by one step unit from the predetermined inaudible level
under control of the loudness controller , 28 is a changeover switch for switching between the
equalizer output and the level variable circuit output for output, and switching control is
performed by the loudness controller. An amplifier 20 amplifies the output of the changeover
switch, and a speaker 22 is driven by the amplifier output to perform an acoustic output.
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[0018]
Reference numeral 30 is an operation unit, 32 is a measurement instruction key for instructing
measurement of the individual's feeling characteristic, 34 is a pure tone generation instruction
key, 36 is an audible level arrival instruction key, and 38 is for switching the loudness control
mode between general purpose and personal use It is a mode switching key. When the
measurement instruction key 32 is pressed and the measurement of the individual feeling
characteristic of the individual is instructed, the loudness controller 16A measures the individual
feeling characteristic of the individual, and personal reference loudness control data (see PLD1 to
PLD9 in FIG. 5). ) Is registered in the memory 18A. Then, when the mode is switched to the
personal loudness control mode with the mode switching key 38, the coefficient k corresponding
to the volume position is added to the personal reference loudness control data of the memory
18A (where 1 ≧ k ≧ 0, the volume position Is from MIN to a predetermined minimum audible
position, k becomes smaller than 1 as the volume increases from the minimum audible position.
The minimum audible position is a volume position corresponding to point a in FIG. Is output to
the equalizer 14 to perform frequency characteristic adjustment control.
[0019]
When the loudness controller 16A is switched to the general purpose loudness control mode
with the mode switching key 38, the equalizer control data created by multiplying the general
purpose loudness control data for the general purpose memory 18A by the coefficient k
according to the volume position is Output and perform frequency characteristic adjustment
control.
[0020]
2 to 4 are flowcharts showing the operation of the loudness controller 16A, and FIG. 5 is an
explanatory view of the personal reference loudness control data, which will be described below
according to these figures.
[0021]
It is assumed that predetermined general-purpose standard loudness control data LD1 to LD9
(see FIG. 13) are stored in the memory 18A in advance, and the personal standard loudness
control data PLD1 to PLD9 are not yet registered.
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In the initial setting process after power on, the loudness controller 16A first sets the loudness
control mode to general use and switches the changeover switch 28 to the side of the equalizer
14 (step 101 in FIG. 2).
Then, the audio signal output from the CD player 10A is adjusted in volume according to the
volume position in the volume 12, then input to the amplifier 20 via the equalizer 14 and the
changeover switch 28, and amplified by the amplifier 20 and then the speaker It is output to 22
and sound is reproduced.
[0022]
Thus, during normal sound reproduction with the loudness control mode set to general use, the
loudness controller 16A receives the volume position signal from the volume 12 (step 102), and
the volume position is set to the standard loudness control data for memory 18A. The coefficient
k according to (where 1 ≧ k ≧ 0 and the volume position is from MIN to a predetermined
minimum audible position, k = 1), and k becomes smaller than 1 as the volume increases from
the minimum audible position. The minimum audible position is a volume position corresponding
to point a in FIG. Is output to the equalizer 14 to perform frequency characteristic adjustment
control (steps 103 and 104). As a result, an audio signal whose loudness is controlled according
to a person having an average feeling characteristic is outputted from the equalizer 14, and the
user has a certain degree of deterioration of the low range and high range feeling at low volume.
You can listen to compensated music. However, since the loudness control that is optimum for
the user's sense of sound characteristics is not applied, a person with the sound sense
characteristics out of the average can not listen to the audio source under a flat frequency at low
volume.
[0023]
On the other hand, when the user wants to listen to music with optimum loudness control in
accordance with his / her own feeling characteristic, he first presses the measurement
instruction key 32 of the operation unit 30 to instruct the measurement of the individual's
feeling characteristic. Do. Then, the loudness controller 16A switches the changeover switch 28
to the side of the level variable circuit 26 (steps 201 and 202 in FIG. 3). Then, the level variable
circuit 26 is set to the lowest level which is the inaudible level (step 203). The pure tone
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8
generation circuit 24 is assumed to be in a stopped state in advance. At this time, the speaker
output is silent.
[0024]
Here, when the user depresses the pure tone generation instruction key 34, the loudness
controller 16A controls the pure tone generation circuit 24 to generate the first pure tone signal
of the predetermined level f1 = 64 Hz (steps 204 to 206). Subsequently, the level variable circuit
26 is controlled to raise the level of the pure tone signal generated by the pure tone generation
circuit 24 by one step from the lowest level and output it (step 207). The pure tone signal is
input to the amplifier 20 through the changeover switch 28, amplified by the amplifier 20, and
then acoustically output from the speaker 22.
[0025]
When the pure tone output from the speaker 22 has not been heard yet, and the given time
elapses without pressing the audible level attainment instruction key 36, the loudness controller
16A controls the level variable circuit 26 to raise the level of the pure tone signal by one more
step. (Steps 208, 209, 207). Then, if the audible level attainment instruction key 36 is not
pressed within the fixed time, the level of the pure tone signal is further raised by one step (steps
208, 209, 207). Hereinafter, the same processing is repeated. As a result, the sound pressure of
the pure sound of 64 Hz output from the speaker 22 is continuously increased. At some point in
time, when a pure tone becomes audible, the user presses the audible level reaching key 36 to
indicate that the audible level has been reached. Then, the loudness controller 16A converts the
level of the pure tone signal output from the level variable circuit 26 at that time into the sound
pressure level, and indicates the lowest audibility data PU1 (subscript 1 indicates that the
frequency is 64 Hz) (Steps 208 and 210), the level variable circuit 26 is set to the lowest level,
and the pure tone generation circuit 24 is stopped (steps 211 and 212).
[0026]
Since there are still unprocessed pure tones (NO in step 213), the loudness controller 16A waits
for the user to operate the pure tone generation instruction key 34 (steps 214 and 205). Here,
when the user depresses the pure tone generation instruction key 34 again, the loudness
controller 16A controls the pure tone generation circuit 24 to generate a second pure tone signal
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9
of f2 = 125 Hz at a predetermined level (step 206). The variable circuit 26 is controlled to
continuously raise the level of the pure tone signal generated by the pure tone generating circuit
24 one step at a time from the lowest level (repetition of steps 207 to 209). As a result, the
sound pressure of the pure tone of 125 Hz output from the speaker 22 is continuously increased.
When a pure tone becomes audible at a certain point in time, when the user depresses the
audible level attainment indication key 36 to indicate that the audible level is reached, the
loudness controller 16A causes the level variable circuit 26 at that time to change. Convert the
level of the pure tone signal output from the signal to the sound pressure level, and temporarily
register it in the memory 18A as the lowest audible data PU2 (subscript 2 indicates that the
frequency is 125 Hz) (steps 208 and 210) The level variable circuit 26 is set to the lowest level,
and the pure tone generation circuit 24 is stopped (steps 211 and 212).
[0027]
Hereinafter, according to the operation of the pure tone generation instruction key 34 and the
audible level reaching instruction key 36, pure tones of 250 Hz, 500 Hz, 1 kHz, 2 kHz, 4 kHz, 8
kHz, 16 kHz are successively increased from the inaudible level in order. However, the minimum
audible limit data PU3 to PU9 obtained from the output level of the level variable circuit 26 when
the audible level is reached are temporarily registered in the memory 18A.
[0028]
When all pure tones have been processed, the loudness controller 16A determines the personal
reference loudness control data PLD1 to PLD9 from the minimum audible limit data PU1 to PU9
temporarily registered in the memory 18A, and the standard for the memory 18A is used. The
loudness data LD1 to LD9 are registered separately (steps 301 and 302 in FIG. 4).
Specifically, in the present embodiment, the personal reference loudness control data PLD1 to
PLD9 are determined by calculating PLDi = PUi-PU7 (i = 1 to 9) with reference to the minimum
audible limit data PU7 of 4 kHz. The standard loudness data for general use LD1 to LD9 are also
determined based on A1 of FIG. 11 in the same manner as the standard loudness control data for
personal use). Personalized reference loudness control data PLD1 to PLD9 in the case where the
user's feeling characteristic is curve B in FIG. 11 are shown in FIG.
[0029]
When the determination and registration of the personal loudness control data PLD1 to PLD9 are
completed, the loudness controller 16A automatically switches the loudness control mode to
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10
personal use (step 303), switches the changeover switch 28 to the equalizer 14, and starts from
the CD player 10A. Normal sound reproduction is resumed based on the output audio signal
(step 304).
[0030]
Then, the loudness controller 16A receives the volume position signal from the volume 12 during
normal sound reproduction, and the coefficient k corresponding to the volume position to the
personal reference loudness control data PLD1 to PLD9 of the memory 18A (however, 1 ≧ k ≧
0) The sound volume position is from MIN to a predetermined minimum audible position, k = 1,
and k becomes smaller than 1 as the volume increases from the minimum audible position.
The minimum audible position is a volume position corresponding to point a in FIG. Is output to
the equalizer 14 to perform frequency characteristic adjustment control (steps 102, 103, 105 in
FIG. 2). As a result, an audio signal whose loudness is controlled in accordance with the user's
individual feeling characteristic is outputted from the equalizer 14, and even if the user has a
feeling characteristic out of average, the audio source is flat at low volume. It becomes possible
to listen under the frequency characteristic.
[0031]
If the user of the set changes to another person, after the user presses the measurement
instruction key 32, the minimum audible limits PU1 to PU9 of each pure sound of 64 Hz to 16
kHz are measured in exactly the same manner as described above. If the personal reference
loudness control data is determined based on the lowest audible limit PU1 to PU9 and registered
as PLD1 to PLD9 in the memory 18A, the loudness control can be performed according to the
new user's feeling characteristic. .
[0032]
Unlike this, when it is desired to return to the general loudness control, the mode switching key
38 may be pressed.
Then, since the loudness controller 16A had been for the personal use in the loudness control
mode, it switched to the general use, and the equalizer was created by multiplying the standard
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11
loudness control data LD1 to LD9 for general use in the memory 18A by the coefficient k
according to the volume position. Control data is output to the equalizer 14 to perform frequency
characteristic adjustment control (steps 106, 107, 108). As a result, an audio signal whose
loudness is controlled in accordance with the average feeling characteristic is outputted from the
equalizer 14, and the low and high frequency compensated sound reproduction is performed to a
certain extent at a small volume. Can.
[0033]
FIG. 6 is an overall block diagram of an audio system with a loudness device according to a
second embodiment of the present invention. The same components as in FIG. 1 are denoted by
the same reference numerals.
[0034]
In FIG. 6, a loudness controller 16B performs frequency characteristic adjustment control to the
equalizer 14, performs general loudness control for a person having an average sound feeling
characteristic, and performs an individual's feeling characteristic according to a user's
instruction. It also has a function of measuring and performing loudness control in accordance
with the user's individual feeling characteristics. In the case of the present embodiment, the
memory 18B includes seven sets of general-purpose loudness control data LD11 to LD19 (LD1 in
FIG. 13) prepared in advance from the sense characteristic curves A1 to A7 in FIG. To LD9), LD21
to LD29,..., LD71 to LD79 are stored. However, LDj7 (j = 1 to 7) is all 0 (dB). As will be described
later, reference correction amount data .DELTA.LD1 to .DELTA.LD9 for correcting the difference
between the average feeling characteristic and the feeling characteristic of the individual user are
also stored in the memory 18B.
[0035]
When performing loudness control under the general-purpose loudness control mode, the
loudness controller 16B divides the volume position indicated by the volume position signal
input from the volume 12 into seven stages corresponding to A1 to A7 in FIG. 11 (specifically, , 1
kHz sound pressure level is 10 phon or less the first volume position, 10 to 30 phon the second
volume position, 30 to 50 phon the third volume position, 50 to 70 phon the fourth volume
position, 70 The fifth volume position when ~ 90 phon, the sixth volume position when 90-110
phon, and the seventh volume position when 110 phon or more), for example, when the volume
corresponds to the fourth volume position, general of memory 18B LD41 to LD49 in the
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loudness control data for audio, and the general purpose loudness control data LD41 to LD49 as
it is as equalizer control data. Output to, to perform the frequency characteristic adjustment
control.
[0036]
Also, when the measurement instruction key 32 is pressed to instruct measurement of the
individual's feeling characteristic of the loudness controller 16B, the loudness controller 16B
measures the minimum audibility of the individual, and the minimum audibility and the average
minimum audibility are measured. The difference is determined and the reference correction
amount (see ΔLD1 to ΔLD9 in FIG. 10).
However, the subscripts correspond to the first band to the ninth band) and are registered in the
memory 18B. Thereafter, when performing loudness control under the personal loudness control
mode, the predetermined correction coefficient k '(0 ≦ k' に) is set to the reference correction
amount data ΔLD1 to ΔLD9 according to the volume position indicated by the volume position
signal input from the volume 12. 1, k '= 1 at the first volume position, and k' decreases as the
step of the volume position increases. Then, the loudness control data LDj1 to LDj9 (j is
corresponding to the step j of the volume position) 1) to 1) to obtain corrected loudness control
data LDj1'.about.LDj9 ', and output the corrected loudness control data LDj1'.about.LDj9' as it is
to equalizer 14 as equalizer control data. Perform characteristic adjustment control. The other
components are configured the same as in FIG.
[0037]
7 to 9 are flowcharts showing the operation of the loudness controller 16B, and FIG. 10 is an
explanatory view of the correction amount data, which will be described below in accordance
with these drawings.
[0038]
It is assumed that seven sets of general loudness control data LDj1 to LDj9 corresponding to
seven volume positions are stored in the memory 18B in advance, and the reference correction
amount data .DELTA.LD1 to .DELTA.LD9 are not yet registered.
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13
In the initial setting process after power on, the loudness controller 16B first sets the loudness
control mode to general use and switches the changeover switch 28 to the side of the equalizer
14 (step 401 in FIG. 7). Then, the audio signal output from the CD player 10A is adjusted in
volume according to the volume position in the volume 12, then input to the amplifier 20 via the
equalizer 14 and the changeover switch 28, and amplified by the amplifier 20 and then the
speaker It is output to 22 and sound is reproduced.
[0039]
Thus, during normal sound reproduction with the loudness control mode set to general use, the
loudness controller 16B receives the volume position signal from the volume 12 (step 402), and
sets the general use according to the volume position step j. The loudness control data LDj1 to
LDj9 are output as they are as equalizer control data to the equalizer 14 to perform frequency
characteristic adjustment control (steps 403 and 404). As a result, an audio signal whose
loudness is controlled according to a person having an average feeling characteristic is outputted
from the equalizer 14, and the user has a certain degree of deterioration of the low range and
high range feeling at low volume. You can listen to compensated music. However, since the
loudness control that is optimum for the user's sense of sound characteristics is not applied, a
person with the sound sense characteristics out of the average can not listen to the audio source
under a flat frequency at low volume.
[0040]
On the other hand, when the user wants to listen to music with optimum loudness control in
accordance with his / her own feeling characteristic, he first presses the measurement
instruction key 32 of the operation unit 30 to instruct the measurement of the individual's
feeling characteristic. Do. Then, the loudness controller 16B switches the changeover switch 28
to the side of the level variable circuit 26 (steps 501 and 502 in FIG. 8). Then, the level variable
circuit 26 is set to the lowest level which is the inaudible level (step 503). The pure tone
generation circuit 24 is assumed to be in a stopped state in advance. At this time, the speaker
output is silent.
[0041]
Here, when the user depresses the pure tone generation instruction key 34, the loudness
08-05-2019
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controller 16B controls the pure tone generation circuit 24 to generate the first pure tone signal
of the predetermined level f1 = 64 Hz (steps 504 to 506). Subsequently, the level variable circuit
26 is controlled to raise the level of the pure tone signal generated by the pure tone generation
circuit 24 by one step from the lowest level and output it (step 507). The pure tone signal is
input to the amplifier 20 through the changeover switch 28, amplified by the amplifier 20, and
then acoustically output from the speaker 22.
[0042]
When the pure tone output from the speaker 22 has not been heard yet, and the given time
elapses without pressing the audible level attainment instruction key 36, the loudness controller
16B controls the level variable circuit 26 to raise the level of the pure tone signal by one more
step. (Steps 508, 509, 507). Then, if the audible level attainment instruction key 36 has not been
pressed within a predetermined time, the level of the pure tone signal is further raised by one
step (steps 508, 509, and 507). Hereinafter, the same processing is repeated. As a result, the
sound pressure of the pure sound of 64 Hz output from the speaker 22 is continuously
increased. At some point in time, when a pure tone becomes audible, the user presses the audible
level reaching key 36 to indicate that the audible level has been reached. Then, the loudness
controller 16B converts the level of the pure tone signal output from the level variable circuit 26
at that time into a sound pressure level, and indicates that the lowest audibility data PU1
(subscript 1 indicates that the frequency is 64 Hz) (Steps 508 and 210), the level variable circuit
26 is set to the lowest level, and the pure tone generation circuit 24 is stopped (steps 511 and
512).
[0043]
Since unprocessed pure tones still exist (decision of NO in step 513), the loudness controller 16B
waits for the user to operate the pure tone generation instruction key 34 (steps 514 and 505).
Here, when the user depresses the pure tone generation instruction key 34 again, the loudness
controller 16B controls the pure tone generation circuit 24 to generate a second pure tone signal
of f2 = 125 Hz at a predetermined level (step 506). The variable circuit 26 is controlled to
continuously raise the level of the pure tone signal generated by the pure tone generation circuit
24 one step at a time from the lowest level (repetition of steps 507 to 509). As a result, the
sound pressure of the pure tone of 125 Hz output from the speaker 22 is continuously increased.
When a pure tone becomes audible at a certain point in time, when the user depresses the
audible level attainment indication key 36 to indicate that the audible level is reached, the
loudness controller 16 B causes the level variable circuit 26 at that time to change. Convert the
08-05-2019
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level of the pure tone signal output from the signal to the sound pressure level, and temporarily
register it in the memory 18B as the lowest audible limit data PU2 (subscript 2 indicates that the
frequency is 125 Hz) (steps 508 and 510) The level variable circuit 26 is set to the lowest level,
and the pure tone generation circuit 24 is stopped (steps 511 and 512).
[0044]
Hereinafter, according to the operation of the pure tone generation instruction key 34 and the
audible level reaching instruction key 36, pure tones of 250 Hz, 500 Hz, 1 kHz, 2 kHz, 4 kHz, 8
kHz, 16 kHz are successively increased from the inaudible level in order. However, the minimum
audible limit data PU3 to PU9 obtained from the output level of the level variable circuit 26 when
the audible level is reached are temporarily registered in the memory 18B.
[0045]
When all pure tones have been processed, the loudness controller 16B determines reference
correction amount data ΔLD1 to ΔLD9 from the minimum audible data PU1 to PU9 temporarily
registered in the memory 18B and the general loudness control data LD11 to LD19, The general
loudness control data LDj1 to LDj9 (j = 1 to 7) are separately registered in the memory 18B
(steps 601 to 603 in FIG. 9).
Specifically, in the present embodiment, the minimum audible limit data PU7 of 4 kHz is used as
a reference, and first, PLDi = PUi-PU7 (i = 1 to 9) is calculated to be relative to general loudness
control data LD11 to LD19. After the differences can be compared, the calculation of ΔLDi =
PLDi−LD1i (i = 1 to 9) is performed to determine reference correction amount data ΔLD1 to
ΔLD9, which are registered in the memory 18B. FIG. 10 shows reference correction amount data
.DELTA.LD1 to .DELTA.LD9 in the case where the user's feeling characteristic (lowest audible
limit) is curve B in FIG.
[0046]
When the determination and registration of the reference correction amount data .DELTA.LD1 to
.DELTA.LD9 are completed, the loudness controller 16B automatically switches the loudness
control mode to personal use (step 604), switches the changeover switch 28 to the equalizer 14,
and outputs from the CD player 10A. Normal sound reproduction is resumed based on the
received audio signal (step 605).
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[0047]
Then, the loudness controller 16B inputs a volume position signal from the volume 12 during
normal sound reproduction, and the reference correction amount data ΔLD1 to ΔLD9 of the
memory 18B have a predetermined coefficient k '(0 ≦ k' ≦) according to the step of the volume
position. 1, k '= 1 at the first volume position, and k' decreases as the step of the volume position
increases), and then loudness control data LDj1 to LDj9 (j is 1 to 7) corresponding to the volume
position To obtain corrected loudness control data LDj 1 ′ to LDj 9 ′, and output the corrected
loudness control data LDj 1 ′ to LDj 9 ′ as it is as equalizer control data to the equalizer 14 to
control the frequency characteristic adjustment. (Steps 402, 403, 405 in FIG. 7).
As a result, an audio signal whose loudness is controlled in accordance with the user's individual
feeling characteristic is outputted from the equalizer 14, and even if the user has a feeling
characteristic out of average, the audio source is flat at low volume. It becomes possible to listen
under the frequency characteristic.
[0048]
If the user of the set changes to another person, after the user presses the measurement
instruction key 32, the minimum audible limits PU1 to PU9 of each pure sound of 64 Hz to 16
kHz are measured in exactly the same manner as described above. If the reference correction
amount data is determined using the lowest audible limit PU1 to PU9 and the general-purpose
loudness control data LD11 to LD19 and registered as ΔLD1 to ΔLD9 in the memory 18B, it is
adapted to the new user's feeling characteristic. Loudness control can be performed.
[0049]
Unlike this, when it is desired to return to the general loudness control, the mode switching key
38 may be pressed.
Then, since the loudness controller 16B has been for the personal use in the loudness control
mode, it switches to the general purpose, and the general purpose loudness control data LDj1 to
LDj9 of the memory 18B corresponding to the volume position step j is used as the equalizer
control data as it is. It outputs to 14 and performs frequency characteristic adjustment control
(steps 406, 407, 408). As a result, an audio signal whose loudness is controlled in accordance
with the average feeling characteristic is outputted from the equalizer 14, and the low and high
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frequency compensated sound reproduction is performed to a certain extent at a small volume.
Can.
[0050]
In each of the above-described embodiments, the pure tone generation instruction key is pressed
to switch the pure tone after pressing the measurement instruction key, but when the
measurement instruction key is pressed, the pure tone of 64 Hz is automatically generated. As a
result, the next pure tone may be automatically generated each time the audible level reaching
instruction key is pressed.
[0051]
Furthermore, although the equalizer has been described by way of example in which the
frequency characteristics can be adjusted in nine bands, it may be adjustable in more than ten
bands or eight bands or less, and loudness control is performed over the entire audio band
Although the case has been shown, only the low frequency side of 1 kHz or less may be used.
Furthermore, although the equalizer is provided on the rear side of the volume, it may be
provided on the front side.
[0052]
As described above, according to one of the present invention, when an instruction to measure
the feeling characteristic of an individual is issued, a plurality of pure tone signals relating to a
plurality of predetermined frequencies in the audio band are sequentially displayed at
predetermined time intervals. When switching occurs, the level of each pure tone signal is output
to the amplifier while continuously increasing from the inaudible level to the amplifier, and it is
instructed that each pure tone reproduced from the speaker has reached the audible level.
Determine personal loudness control data from the level, and then, when performing normal
sound reproduction, perform frequency characteristic adjustment control on the equalizer using
personal loudness control data at low volume in conjunction with volume adjustment by volume
With this configuration, loudness control is performed according to the individual user's sense of
touch characteristics. It is possible to listen to faithful music audio sources under flat frequency
characteristic.
[0053]
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Further, according to another one of the present invention, when an instruction to measure the
feeling characteristic of an individual is issued, a plurality of pure tone signals relating to a
plurality of predetermined frequencies in the audio band are sequentially generated every
predetermined time. And output to the amplifier while continuously increasing the level of each
pure tone signal from the inaudible level to the minimum level from the level of the pure tone
signal at each time when it is instructed that each pure tone reproduced from the speaker has
reached the audible level. The audibility limit is determined, and the minimum audibility limit is
used to correct general-purpose loudness control data stored in the memory, and when
performing normal sound reproduction, correction is made at the time of small volume in
conjunction with volume adjustment by volume. Because it was configured to perform frequency
characteristic adjustment control for the equalizer using the loudness control data of Control is
possible, the user is also a time of small volume, it is possible to listen to the faithful music to the
audio source under the flat frequency characteristics.
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