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JPS5266403

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DESCRIPTION JPS5266403
f8 栃 O'Nov 29 November 2006 Managing Director Patent Office 1, Name of Invention & Patent
Applicant Address Aobadai 8 chome Aobadai Meguro-ku Tokyo Tokyo ■ Japan Patent Office 0
JPA 52-64 030 published Japanese Patent 52 . (1977) 6.1 Internal agency number 7 ♂yl, l! -3
Specification 1, Title 1 of the Invention, Name of the Invention Sound Signal Generator for Sound
Image Position Measurement
Higakigishi Yu
3. Detailed Description of the Invention The present invention relates to an acoustic signal
generator for measuring a sound image position of reproduced sound in a stereo reproduction
apparatus. When the stereo playback device is operated and the playback sound is heard, the
sound image is not determined in a certain range of the playback sound, the sound image
position moves, or the stereo feeling is insufficient, and the spatial spread of the playback sound
is felt. I can not get 4 matches. Such a phenomenon faithfully transmits, amplifies and reproduces
the level difference and the phase difference between the right channel signal and the left
channel signal manually input to the stereo reproduction device in each range, but does not This
is because the phase difference is lost. Conventionally, tests such as sound image localization or
stereo feeling of a stereo reproduction apparatus as described above are mainly performed by a
method of judging on hearing by a hearing test in an operation state of the stereo reproduction
apparatus using seven aural signals or the like. Therefore, the present invention generates an
audio frequency double No. 9 in which the sound image position is quantitatively grasped in
advance, and the signal is input more in stereo reproduction apparatus and more quantitative
than in the audibility judgment of the stereo reproduction apparatus. An object of the present
invention is to provide an apparatus for obtaining an acoustic signal for sound image position
measurement that can be determined. Sound image position measurement river sound according
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to the present invention based on the following drawings. One embodiment of a reverberation
signal generator will be described. FIG. 1 is a block diagram showing the basic configuration of
an audio signal for generating a sound image position turbidity according to the present
invention EndPage: 1 main unit, which generates an oscillation output of the same frequency at
the same level from the audio frequency oscillator l. Add to channel's iJ 'variable delay circuit 2
and left channel's variable delay circuit 3. The variable delay circuit 2.3 can set its delay time in
advance by means of the delay time adjusting knob 4. When this knob 4 is set at the center
position a, the delay time of the output signal of the both-port j variable delay circuits 2 and 3 is
zero, and turning the knob 4 clockwise turns the output signal of the variable delay circuit 2 Be
delayed. Conversely, when turned to the left, the output signal of the variable delay circuit 3 is
delayed. In other words, only one or the other of the nine signals for the left and right channels is
delayed by the knob 4. The outputs of variable delay circuits 2 and 3 are simultaneously applied
to left and right signal level adjustment circuits 5 and 6 and phase difference detection circuit 7,
respectively. The signal level adjusting circuits 5.6 are respectively attenuators, and the amount
of attenuation thereof is varied by the knob 8. When the knob 8 is positioned at the center
position, the signal level transmitted to the signal output end 9 for the right channel and the
signal output end 10 for the left channel / channel is the same, and the knob 8 is set. When the
right IIK is turned, the signal level adjustment circuit 5 attenuates the signal level for the right
channel, and when the reverse busy knob 8 is turned to the left, the signal level adjustment
circuit 61C attenuates the signal level for the left channel.
The output of the signal level adjustment circuit 5.6 converted by the knob 8 in this manner is
applied to the signal level difference detection circuit 11 at the same time as the power of the
stereo reproduction apparatus A of the system under test. The signal level difference detection
circuit 11 detects the level difference between the left and right channels, and the output is
manually input to the addition / subtraction amplifier 12. On the other hand, the phase
difference detection circuit 7 receiving the output of the variable delay circuit 2 ° 3 detects the
phase difference between the left and right channels and applies the output to the addition /
subtraction amplifier 12. The indicator 13 is shaken. The indicator 13 indicates that the zero
position is at the center of the sound image, the positive shake is at the right position of the
sound image, and the negative shake is at the left position of the sound image. You can know the
sound image position in advance. The first figure shows a block diagram showing an operation
example of the stereo reproduction apparatus A of the measured system by the sound signal
position measurement acoustic signal generator B according to the present invention shown in
FIG. The output signal of the sound signal generator B is set in advance so that the sound image
is positioned at an arbitrary position in the forward space of the tester facing the speaker 14e15
of FIG. It can be determined whether the sound image is faithfully reproduced by the sound.
Therefore, according to the present invention, stereophonic sound image localization and stereo
feeling test adjustment of the stereo reproduction apparatus of the system to be measured can of
course be performed by the sound source whose sound image position is quantitatively grasped,
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and conventional judgment on auditory sense ' It has the feature that it is possible to judge more
quantitatively than it is-variation due to individual differences in hearing sensation.
il, 4, Brief Description of the Drawings FIG. 1 is a glock diagram showing an embodiment of an
acoustic signal generator for sound image position measurement according to the present
invention. FIG. 2 is a block diagram showing measurement conditions. · · · · · · · · Audio frequency
oscillator, 2.3 · · · variable delay circuit, 4 · · · knob-5, 6 · · · signal level adjustment circuit, 7 · · ·
phase difference detection circuit, 8 · · · · · · · , 9.10 ... output terminal, 11 ... 2 signal level
difference detection circuit, 12 ... addition and subtraction amplifier, 13 ... indicator, EndPage: 2
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