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JPS55147817

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DESCRIPTION JPS55147817
In the method for correcting acoustic characteristics and auditory sensation described in the first
and second items of the claims (1), (3) and the claims, a general zologronse reproduction system
such as music and a system for correcting acoustic characteristic distortion are described.
Acoustic characteristic auditory correction method: (The acoustic characteristic auditory
correction method characterized in that the reference signal and the comparison signal are
automatically switched one by one.
Acoustic characteristic Audibility correction method In particular, a combination of representing
a band 1ii 11 limited noise signal having a center frequency which is included in one recording
track of a predetermined reference signal sound and which is predetermined at each fixed time
interval The reference signal and the comparison signal are sequentially presented by using the
program north having the comparison signal in the other recording track which is made to
change or repeat all of the center frequencies of the band limited noise signal while providing a
large number of Patented in that the acoustic characteristics of the transmission system
including the sound reproducing apparatus are corrected to be audibly flat by adjusting the level
of each frequency of the equalizer so that these signals become aurally equal volume in hearing.
(2) In the acoustic characteristic audibility correction method according to claim 1, the level of
the band limited noise signal of the comparison signal is determined based on the equal
sensitivity curve Acoustic characteristic auditory correction method characterized by and.
DETAILED DESCRIPTION OF THE INVENTION This invention is for sound at the listening point,
frequency! l′! It relates to an acoustic characteristic aural correction method for useless
correction of F characteristics, and in detail, in particular, a hearing room transmission without
using a special high-pitched music device such as a real time spectrum covered tram analyzer.
The present invention relates to an acoustic characteristic aural correction method in which
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characteristics and acoustic equipment characteristics are determined, and the characteristics of
the equalizer are determined based on the determined results. FIG. 1 is a diagram showing a
conventional acoustic characteristic tracking system, in which the output signal from the pink
noise generator l is amplified by the word amplifier 3 after passing through the equalizer 2 and
the left and right speakers 4, Any one of the four (4) EndPage: One sound is emitted. (1) The
sound of super power 4, 4 is converted to an electric signal by the microphone 5 installed at the
listening point, amplified by the microphone annolo, and applied to the real time spectrum
analyzer 7 to obtain the listening room transmission characteristics and the sound reproduction
The acoustic properties of the device are measured. By adjusting the equalizer 2 based on the
measured result, the listening point sound pressure frequency characteristic is corrected. Such a
listening point sound pressure frequency characteristic correction method is very one as a means
to improve the sound quality (although it is well known that it is an effective means, but
expensive and special measuring devices such as a real time spectral analyzer are indispensable
It becomes a thing. Therefore, a general listener who does not have an expensive and special
measuring device such as a real time spectrum analyzer reproduces a source such as music and
appropriately determines the characteristics of the equalizer according to the listener's
experience and preferences . However, most music sources have a change in frequency
characteristics at the time of recording or at the time of mixdown 7 (3), so the method of
characterizing the equalizer according to such listener's experience or preference K is Not only
has to recompensate the equalizer characteristics for each north, there is also a problem that it
becomes difficult to exhibit the original functions of the equalizer. The object of the present
invention is to solve such problems by using a record carrier on which a norrogram north for
audibility measurement is recorded, and an equalizer capable of changing the level of the center
frequency of a plurality of band limited noises. , And sequentially presenting the reference signal
and the comparison signal to adjust the level of each frequency of the equalizer so that both
signals have equal volume in terms of auditory sense. It is.
Next, an embodiment of the present invention will be described based on the drawings. FIG. 2A
shows the signal waveform of the program north for audibility measurement used in the present
invention, which is one of the tracks, for example, R channel / 14. In the other track, for example,
L channel, the center frequency changes according to the frequency factor f of the equalizer, and
the other track, for example, the L channel, is composed of a band limited noise signal having a
reference center frequency of 1 kHz. A reference signal is recorded whose level is made to
change based on the Lobi / non-Danotonone curve shown in FIG. As can be seen from FIG. 6,
since the characteristic curve also changes according to the sound pressure level, it is desirable
to use program north recorded at several levels in accordance with the average listening sound
pressure level of the listener. FIG. 3 is a view showing the whole of the stem in the case of
implementing the acoustic characteristic auditory sense correction method of the present
invention, and the L channel side of the auditory measurement program source as shown in FIG.
The comparison signal and the reference signal respectively recorded on the L channel side are
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automatically switched sequentially by the switch SW1 in accordance with the contents of the
recording signal of the program source. That is to say, 1 hearing sense 1) The signal is
alternately recorded on the R channel L channel of the regular program north, and to the L
channel side when there is a signal on the L channel side, L channel side (( When the signal is
present (5), it is switched to the L channel side. (The present state indicates the L channel side,
that is, the state where the reference comparison signal is selected. The switch SW1 is
automatically switched by an input signal automatic switching circuit as shown in FIG. That is, as
shown in A of FIG. 2, when the signals recorded on the L channel and R channel of the auditory
measurement program source are reproduced, they are mixed by the resistor 8.9 and input to the
operational amplifier 10, The rectifier 11 performs full wave rectification. Then, a part of this
full-wave output is supplied to the input side of the operational amplifier 10 via the negative
feedback 12 (C is returned to the other output (one capacitor 13. The signal is smoothed by the
resistor 14 and input to the comparator 15, and outputs a waveform signal as shown in FIG. 2B.
5 The time constant of the capacitor 13 and the resistor 14 constituting the smoothing circuit is
a comparison reference It is determined by the highest frequency of the signal. If the output of
the computer e 17-15 is input to the inverter 16 and converted into a waveform as shown in FIG.
2C, it is input to the frinosophonop 17.
(6) EndPage: The output 1 of the second flip-flop 7 is a waveform as shown in FIG. 2D, and the
output is a switching that is connected to the solenoid 18 of the Shira 7 nore that switches the
switch SWI. The transceiver 19 is controlled. The resistor 20 is a bias resistor. The input signal
automatic switching circuit configured as described above can detect the reference signal or the
fd comparison signal according to the timing shown in FIG. 2 when the auditory measurement
program signal is applied to the input terminal of this circuit. At the end, the switch SWI is
switched to automatically select a signal supplied to the equalizer or the like. Then, each channel
of the sound reproducer and the transmission system of the listening room whose sound
characteristics are to be corrected is selected by the switch SW 2 (the present state selects the L
channel side to correct the L channel side) ), The switch 5W3−, and the switch 5W3−2 are used
to determine the characteristics of the equalizers 2 and 2 according to the acoustic characteristic
audibility correction method of the present invention, and to select the case of playing North
such as original music. It takes place. (The current state (which is the state in the case of
determining the equalizer characteristic (7)))-Still, by means of the switch 5W4-, and the switch
SW4-2, to insert into the reproduction system The choice is λ selected t L (the current state is
that the equalizer has been inserted into the reproduction system). Next, the method of the
acoustic characteristic correction 15 of the present invention will be described based on FIG. In
the figure, the program for audibility measurement as shown in A of FIG. 2 is reproduced by an
audio reproducer 21 such as a tape recorder, and an output from this (a connection state as
shown in FIG. Then, after fc via the correction system stem 22 held in a state of complementing
the L channel side, the signal is inputted to the speaker 4 via the word anog 3. Then, the
reference comparison signal from the arousal measurement program north reproduced by the
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sound reproducer 21 and the band-by-band noise limiting signal are alternately output from the
L channel side speaker by the input automatic switching circuit shown in FIG. Ru. The listener 23
uses the same frequency (8) wave number J as the center frequency of the band limited noise
signal of the comparison signal output from the L channel side speaker, and uses the level
controller / trailer of the equalizer to obtain the base 1g (ie Adjust the signal to change based on
the non-Danotson curve and the above-mentioned comparison word and the same volume; After
performing this operation as many as the number of band 41jll noise signals of the specific bit or
the number of level-contrator elements of the equalizer, the changeover switch 5w2y of the
complementary E / stem 22 is switched and the R channel side Q is selected. Do the same
operation.
When the adjustment of both tunnels is completed, the changeover switch 5w3- and 5W3-2 are
switched to return to the normal four stems to complete the adjustment. As described above,
according to the acoustic characteristic audibility correction 15 method of the present invention,
it is not necessary to use an expensive measuring device such as a real time spectrum analyzer;
There is an effect that correction can be performed according to the hearing characteristic of
each listener as well as it can be implemented easily if the program n is b.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a diagram showing an outline of the acoustic
characteristic determination / stem of Sueto, and FIG. AH: A sound characteristic correction
method V of the present invention is a diagram showing a signal of a program north for a
hearing aid 1 to be used, B, C, D are diagrams showing waveforms of respective portions of an
input automatic switching circuit FIG. 3 is a diagram showing a correction / stem used in the
acoustic characteristic audibility correction method of the present invention, and an input
automatic switching used in the correction / stem shown in FIG. FIG. 5 is a diagram showing a
circuit, FIG. 5 is a diagram showing a connection relationship of a dam for implementing the
method of sound and sound acuity correction of the present invention, and FIG. 6 is a diagram
showing a robin non-danotronon curve It is. 1. Pink noise generator, 2 equalizers, 3 row
amplifier, 4 ° speaker, 5. Micro-Nino, 6: Mike Anzo, 7 ° Real Spectrum Analyzer, 8. '1.12, 14.20
resistance, 10: operational amplifier, 13. コンデ/す、15:コノノぞレータ、16:インバータ
、17:フリノゾフロノ!、18ニルノイド、19. Switch / gutran nosta, 21: tape recorder,
22: correction / stem, 23 ° listener. (10)EndPage:3くの○0−にEndPage:
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