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JPS5642495

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DESCRIPTION JPS5642495
Description 1, title of the invention
Sound reproduction device
3. Detailed Description of the Invention The present invention relates to an audio reproduction
apparatus for reproducing stereo and monaural signals with a narrow speaker interval such as a
stereo cassette with two speakers or an audio multiplex receiver with two speakers. In the abovedescribed sound reproducing apparatus with narrow speaker intervals, good stereo feeling and
realism can not be obtained by the normal reproduction method due to the restriction of the
outer dimensions and the like. The present invention is, for example, in an apparatus that
reproduces stereo signals and monaural signals such as audio multiplex television sound, the
presence of the reproduced sound of monaural signals, and clearer sound image localization in
the sound field expansion effect at the time of stereo signal reproduction. A sense of reality can
be obtained, and most of the signal control circuits for both monaural and stereo signals can be
made compatible, so that it is rationally monaural, as shown in FIGS. 1, 2 and 3 of the
conventional stereo. A sound image enlargement circuit dedicated to the signal EndPage: 1 is
shown. Fig. 1 shows the simplest sound image enlargement circuit, with both left and right
channels L. A phase inversion signal of the main channel signal level ratio α (α <1) is created
from each of H, added to the other channel, and the crosstalk sound component generated in the
listener's both ears at the time of two-speaker reproduction is cancelled. To reduce or reduce the
sound image enlargement effect. The circuit is composed of the amplifiers 1, 2 and the adders 3,
4 of the phase inversion type amplifier α, but in this system, the low-pass component of the
stereo signal is mainly input in the same phase Therefore, at the time of mixing by the adders 3
and 4, the low frequency component decreases, and the ratio becomes as large as increasing the
enlargement amount (α 1). The sound image enlarging circuit shown in FIG. 2 is devised for the
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purpose of eliminating the drawbacks of the circuit of FIG. The circuit shown in FIG. 2 is a circuit
in which an I-pass filter 5, 6 is inserted before or after the amplifiers 1, 2 in FIG. 7 and 8 and
adders 9 and 1 o are used to prevent −; ′ cancellation of the in-phase low-frequency
component. This method improves the frequency balance of the reproduced sound compared to
the method shown in FIG. It is not perfect, and the resolution of sound image localization is not
as good as that of the system shown in FIG. FIG. 3 further improves the system of FIG. 2. In FIG.
3, 11.12 is a bypass filter for blocking low frequency signal cancellation, and 13 'and 14 are
inverting amplifiers of amplifier α, Low pass filters 15 and 16 are inserted after the inverting
amplifiers 13.14. 17.18 is an adder. The low-pass filter 15.16 brings the frequency
characteristics of the crosstalk sound of the listener's ears close to those in the middle to high
tone signal region to enhance the cancellation effect and at the same time improve the frequency
characteristic balance of the reproduced sound somewhat.
Therefore, the resolution of sound image localization is also improved as compared with the
method shown in FIG. 2 and is highly practicable as a sound image enlargement method for
stereo signals, but in this method, considering the difference in arrival time of sounds between
both ears, The resolution of sound image localization is improved and becomes more complete.
Generally, in order to obtain an enlargement of the sound image for a monaural signal, it is
necessary to perform an operation on correlation of amplitude and phase (or time) on the
listener's both ears, and FIG. An example is shown. In FIG. 4, 19 is an input signal terminal to
which a monaural signal is input, and 20 is a delay circuit having an initial delay time of usually
several ms to several tens of mg. The delayed signal outputs are mixed with the input signals of
opposite phases (sometimes with phase characteristics) in the adders 21 and 22 and are output
to the output terminals 0UT1.0UT2, respectively, the frequency characteristics of this mixed 2
signal For example, as shown in FIG. 5, the output amplitudes alternate between peaks and dips
with respect to the frequency as shown in the figure, and the relationship between the amplitude
characteristics of 0UT1 ° 0UT2 is completely symmetrical. Is reproduced by two speakers, this
characteristic relationship is maintained at the point of both ears when listening at the center of
the speaker. This means that the sound pressure relationship between both ears always changes
according to the frequency change of the monaural input signal, and the listener has a larger
effect on the monaural component in the higher sound pressure level. But has no effect on the
left / right separation localization component. じないものである。 Therefore, in the case of
reproducing two stereo signals such as audio multiplex television, in order to realize the
respective enlargement, separately from the stereo enlargement circuit as shown in FIG. 1 to FIG.
Since two signal control circuits such as the monaural expansion circuit as shown in FIG. 4 are
required, the circuit configuration becomes complicated and extremely disadvantageous in cost.
In view of the above, the present invention constitutes a stereo signal enlargement circuit to
which a monaural signal enlargement circuit can be easily added, and further measures the
transfer function of sound between a stereo sound source using an artificial head and a listener
By utilizing the measurement data, a practical monaural, stereo compatible sound image
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enlargement circuit with high sound image localization accuracy is realized. The present
invention is applied to a stereo with narrow speaker intervals, a monaural playback device such
as an audio multiplex television, etc. An example of the audio multiplex television will be
described below. EndPage: In a 27-TV television, there is an appropriate viewing distance, and
the ratio of the playback sound listening distance to the stereo speaker spacing is large, so the
listening angle for the sound source speaker is several degrees to several tens of degrees, The
stereo standard listening angle is very small relative to ± 30 degrees.
For this reason, when stereo reproduction is performed in a normal state, a sufficient stereo
feeling can not be obtained. For this purpose, a stereo sound image enlargement circuit is
required. FIG. 6 shows a schematic view of a stereo listening state. In this case, the speaker 7 SPY
and the speaker SP2 are stereo speakers with built-in sound multiplex television. As described
above, in the case of audio multiplex television, the listening angle θ is small, and in this case it
is assumed that θ = 15 °. A and B are transfer functions between the speaker 5P1 (speaker
5P2) and the listener's ears 23.24, respectively. The speaker SP3 is assumed to be the position of
the sound source expansion localization of the speaker SP + due to the sound image enlargement
action, and the listening angle is' -1 number unique to the sound source position, to realize the
sound source position of the listening angle φ. The transfer functions c and n must be realized in
each of the listeners' ears 23 ° 24 by the speaker SP +, the transfer functions A and B of the
speaker SP2, and the signal control circuit in the second stereo channel system. What is the
response of the transfer function of each person, B, G, D, θ 2 15 °. φ = 9 o '? An example of
measurement using an artificial head for the case is shown in FIG. 8 and FIG. (Swing
characteristics only) This measurement data is obtained by correcting the sound source speaker
and the transmission characteristic of the transducer only to flat, then inputting an impulse into
the sound source speaker, and Fourier transforming the output of the 6 頭 microphone The
spatial amplitude characteristics of the sound source speaker and the artificial ear and ear canal
are shown as the main system amplitude characteristics for the listening angle θ = 15 ° and the
90′Ilj constant distance 1 ° 6 m. Next, as shown in FIG. 7) and (b), in the stereo listening
system (B) of the listening angle θ, a sound image localization of the listening angle φ of (A) is
obtained 9 ′. Therefore, the listener's binaural sound pressure in the above equation (1)? In
order to make the listener's binaural sound pressure equivalent from (2), (1,) = <px ') l (PL) = (PL'
:) control circuit H1 obtained from equation (3) , E2 ′, Fig. 7 Signal control pro by electric
circuit. Can be converted into a pro shown in FIG. 10, and in the case of a stereo system, it
becomes the control system of FIG. A sound signal enlargement and reproduction system based
on a stereo signal system can be realized as shown in FIG. 11 from more than 1010, −E, A *
C−D * B, but in the present invention, a sound image enlargement control system for monaural
signals and its control circuit To realize the compatibility of FIG. 12 as a monaural, stereo signal
sound image enlargement control system. In FIG. 12, I'i N, LIN are R-channel and L-channel
signal input terminals, and Fl and 30 G designated 25.26 are signal control circuits.
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27 ° 28 is a phase inverter, and 29 and 31. 32 are adders. Here, when comparing the output
signals of the control system of FIG. 11 and the control system of FIG. 12, assuming that the RCH
input signal is I and I and the CH input signal are l, FIG. On the other hand, in FIG. 12, EndPage:
311 Bm-.RouT = (1 + G) * F * T-F * G *. 1l-(9) LL) UT = (1 + G) * F * 1-F * G * γ-Q 10) Therefore,
the condition for equalizing ('7) and (9), (8) and (1o) is If F and G 'in FIG. 12 are obtained from E
+ = (1 + G) * F (11) E2 knee F and * G (12) (11) + (12), F = E1 + shame □ (13) 9 It becomes.
Substituting (4) and (5) into (13) + (14) gives From the above, in order to obtain the '' -teleo
sound image enlargement effect in the signal control system of FIG. 12, the transmission shown
by F (and G) signal 121, and the% (15) + (16) I know that it is good if I give characteristics. The
circuit F is an element mainly for determining the directionality of the sound image, and the
circuit G is an element mainly for creating a difference in amplitude of sound to both ears and a
phase difference (time difference). That is, it can be realized by the signal control system of FIG.
Therefore, the transfer function take 1 measured earlier. The calculation results in the case
where θ 2 16 ° and φ = 90 are set according to A, B, C and D are shown in FIGS. 14 to 17. FIG.
14 shows an amplitude characteristic of F, FIG. 15 shows a phase characteristic of F, FIG. 16
shows an amplitude characteristic of G, and FIG. 17 shows a phase characteristic of G. As a result
of differentiating the phase characteristic of FIG. 17G by frequency, a delay time τ 5-170 [μS]
was obtained in this calculation example. As described above, in the control program shown in
FIG. 13, if the transfer characteristics shown in FIGS. 14 to 17 are realized by an electric circuit,
an ideal stereophonic sound image enlarging circuit can be realized. Next, a circuit to which a
monaural signal sound image enlargement circuit is added will be described. FIG. 18 shows a 13bit, stereo-compatible sound image enlargement circuit according to the present invention, and
illustrates signal paths of a monaural signal sound image enlargement circuit. An adder 33 is
added from RCH and LCH by the adder 33 and given an initial delay of several s to several tens
of ms by the analog signal delay element (BBD) 34 and is input to the low pass filter 35 and is
input to the switch 36 Then, in the mode of the contact point a, they are input to the adder 37.
39 in an inverted phase, and are synthesized here with the direct signal from the arithmetic
circuit.
38.42 is a phase inverter. The output signal of the adder 37. 39 has the amplitude characteristic
as shown in FIG. 5, and the sound image enlargement effect can be obtained by the same
principle as the conventional monaural signal sound image enlargement circuit shown in FIG. In
the monaural sound image enlargement circuit of the present invention, since the human-power
signal of BBD is taken from the output side of the directionality determination circuit of RCH and
LCH, the clock pulse of BBD can be obtained by configuring a low-pass filter with the reverse
characteristic to The removal and flatness of the output signal can be realized, and the flatness of
the frequency characteristic of the combined output signal of the adders 37 and 39 can also be
improved 14- '. Further, according to the present invention shown in FIG. 18, if the output signal
of the binaural difference generating circuit 41 and the output signal of the low pass filter 35 are
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added by the adder 40, the switch 36 contacts. The sound image enlargement effect is emitted to
the signal component. This is effective when the left and right independent localization signals
and the center localization in-phase signal are mixed as in a normal stereo source and the like,
and a sense of distance is added to the center localization sound image and the effect is enhanced
by the sound image enlargement effect. As described above, according to the present invention, a
monaural delay unit is separately provided, and a monaural or stereo sound image enlargement
effect can be easily obtained by the switch circuit. FIG. 19 is practically sufficient with the
simplest circuit constituted by the capacitor C resistance H. 4
3 is the signal input terminal,
and 44 is the output terminal. Frequency 1 and wave number characteristics increasing by 6 ds
10 Ct from the frequency determined by CR1 at T are obtained. The frequency characteristics are
shown in FIG. 1 knee T1. R + -1-12 EndPage: 415-A * D-1 * B Next, a circuit of a differential-aural
generating circuit, -B * (+ D) is shown. FIG. 21 shows an example of the transistor 2 and OR, 46 is
an input terminal, R1 and R2 are bias resistors, Q 'is a transistor, the emitter of this transistor Q1,
and resistors R3 and R4 are inserted in the collector. To form a phase inversion circuit. The
transistor Q2 is an emitter follower and a 7-lid output signal is 02.. The frequency is corrected by
R7 and C3. More specifically, frequency characteristics are determined with time constants
determined by C8, that is, C2Ry-T11R, R8T1-T21, and RyXRsR7 + R8C2-T3. The delay time of the
stereo signal is created by the phase shifter and the low pass filter, and is obtained by TS cattle
C1R5 + T3. FIG. 22 shows the characteristic.
When the enlargement effect of the circuit of FIG. 18 composed of these circuits is confirmed, the
sound image localization in stereo is sufficient for the sound image enlargement effect even in
the conventional case “mono” = gL / s16, especially the song of television broadcasting It was
very effective in the program and sports broadcast. The present invention is configured as
described above, and according to the present invention, the following effects can be obtained.
(1) A stereophonic sound image enlargement effect can be obtained which is clearer in sound
image localization and less discordant than the prior art. (2) There is little deterioration of the
sound quality by enlarging the sound image expansion width. (3) Add a monaural delay circuit, a
monaural, stereo compatible enlargement circuit. It can be configured. (4) By combining two
delayed output signals, the expansion effect of a stereo source can be further enhanced.
4. Brief description of the drawings Figs. 1 to 3 are pros and schematics of the conventional
stereo sound image enlarging circuit, Fig. 4 is a block diagram of the conventional monaural
sound image expanding circuit, and Fig. 6 is an output of the same circuit. FIG. 6 is a schematic
view of -m-, and FIG. 7 (A) is a listening state of a listening angle .phi. In Fig. 7 (B) is a schematic
diagram of a 2-channel 171 =-control system equivalent to Fig. 7 (m), and Fig. 8 is a transfer
function equation of a listening angle of 15, B Fig. 9 shows the amplitude characteristics of
transfer functions C and D at listening angle 90, Fig. 1o shows a block diagram of the monaural
control system equivalent to Fig. 7 (B), Fig. 11 shows Fig. 11 7 is a block diagram of a stereo
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sound image enlargement control system equivalent to FIG. 7F, FIG. 12 is a block diagram
showing the basic configuration of the sound reproducing apparatus of the present invention,
FIG. 13 is a block diagram showing the same apparatus by transfer function, The figure shows
the calculation result of the amplitude characteristic of the directionality judgment circuit of the
same device, FIG. 15 shows the calculation result of the phase characteristic of the same circuit,
and FIG. 16 shows the vibration of the binaural difference generating circuit of the same device.
FIG. 17 shows the calculation result of the width characteristic, FIG. 17 shows the calculation
result of the phase characteristic of the same circuit, and FIG. 18 is a block diagram of another
embodiment of the present invention. Fig. 19 is an electric circuit diagram of the directionality
determination circuit of the same device, Fig. 20 is the same frequency characteristic diagram,
Fig. 21 is an electric circuit diagram of the binaural difference generating circuit of the same
device, and Fig. It is the same frequency characteristic figure. 25.26 ...... directional decision
circuit, 27.28 ...... phase inverter, 29 ..... adder 30 ...... binaural difference 1, to depression , An
adder 33, an adder 18, an adder 34, an analog signal delay element 35, a low pass filter 36 .......
42 · · · · Phase inverter. Name of agent Attorney Nakao Toshio and others 2 people · · · · -1 鄭; Z'r+1, g, / EndPage: 5 Figure 1 Figure 2 Figure 6 Figure 7 End page: 6 FIG. 10 FIG. 11 FIG. 12 FIG.
14 FIG. 15 FIG. 15- to 02-End Page: 7 FIG. 21 FIG. "Display of the case in October z 2 1 1 Showa
641 許 Patent No. 106 368 Bow 2 Title of the invention 2 Name of the invention Person making
the sound reproduction device 3 correction-month; j · (· ·) Seki (system 11 Assigned to the
applicant) 7 · “Odayama Kadoma city Ogata Kadoma name 1002 Name (582) Matsushita
Electric Industrial Co., Ltd. Representative-tlr Toshihiko Shimo 4 agent address 571 Osaka
Kadoma city Ozad Kadoma address 1006 Matsushita Electric Industrial Co., Ltd. The target of the
correction within the company 6, the content of the correction (1) “In order to be input mainly
in the same phase,” page 3 line 10 to line 11 of the specification In order to be input to, it
corrects to ".
(2) Correct the “several degrees to number degrees” on the same page 7, line 4 to “several
degrees to several tens of degrees”. (3) On page 16, line 9, "Only add" is corrected to "only add".
ゝ 一 シ ー シ ー, ゾ ー-EndPage: 9 Warning: Page Discontinuity
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