JPS5021801

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DESCRIPTION JPS5021801
■ Conversion device of monaural signal to stereo signal App. No. 41-214 ■ Japanese Patent
Application No. 39-20042 [Phase] Application No. 39 (1964) Apr. 10 @ Inventor 厨 守 川 崎 小
小 Komukai Toshiba Town 1 Tokyo Shibaura Electric Co., Ltd. Central Research Institute @
applicant Tokyo Shibaura Electric Co., Ltd. Kawasaki City, Kawasaki-ku Horikawacho, 72 [Fa]
third-party buried patent attorney Akira Tomioka 3 people
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a circuit diagram showing an embodiment of
the apparatus for converting a mono signal to a stereo signal according to the present invention,
FIG. 2 is a specific circuit diagram of a phase volume controller according to the present
invention, 3 The figure is an actual characteristic diagram of the filter circuit in FIG.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for
converting a mono signal into a stereo signal. Conventionally, as a device for pseudomonolithically forming a mono signal, the mono signal is separated into a high frequency
component and a low frequency component, and thereafter the high frequency component is
supplied to the high frequency component volume enhancement circuit. The low frequency
component is supplied to the low frequency component volume enhancement circuit in a
commercial machine, and the balance between the high frequency and the low frequency is
adjusted by separating the low frequency and high frequency, and the stereo signal of the
monaural signal is formed. There was a converter. The device can be rendered relatively well in
the case of an instrument that produces narrow band sounds. However, for example, in the case
where an orchestra is recorded as seven-noral and the mono signal is converted into a stereo
signal by applying the conversion device of the mono signal to the stereo signal, there are the
following disadvantages. If the sound source includes a musical instrument that generates a wide
frequency band such as a piano or a violin, the conversion device to this stereo signal [111111]
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simply divides the monaural signal into low and high frequencies. Since it only emphasizes each
frequency band, for example, it divides the sound of the low-pass component of the violin and the
sound of the high-pass component, emphasizes each component, and uses only the so-called
volume change reproduced using a speaker In this case, even if you emphasize the high
frequency sound of the left speaker by saying that the violin was at the left end, you can only
hear the treble from the left and the bass of the violin will also be heard from the right . Also,
especially when playing from high to low sounds continuously in the piano performance, the
sound of the piano will run sideways and be heard. That is, sound images are created on the left
and right of one musical instrument, and localization of the musical instrument can not be
obtained, so a three-dimensional effect is not obtained. Also, in order to obtain a stereo effect by
binaural, it is necessary to form a sound image by a volume effect, a phase effect, etc. In the case
of a normal human ear, the volume effect becomes higher sensitivity as the frequency of the
sound becomes higher (phase effect As for the sound frequency of the sound is low (the
sensitivity becomes high as it becomes, and any effect is not possible (it is impossible to
reproduce a three-dimensional sound). For this reason, the above-described apparatus for
converting a mono signal into a stereo signal has a disadvantage that even the condition of the
above-mentioned stereo effect is not satisfied because it is only the volume effect. The present
invention has been made to eliminate the above-mentioned drawbacks, and is a stereo of a
monaural signal that separates a monaural original signal into three frequency components and
three-dimensionally locates a sound image by the difference in volume or sound quality of these
components. It provides a conversion device to a signal.
Hereinafter, an embodiment of the present invention will be described in detail with reference to
the drawings. The output of the monaural sound source 1 is divided into four, and each has a
variable cut-off frequency type high-pass separation p-wave unit 2 high band side cut-off
frequency variable type mid-range separation F wave unit 3 low-pass side cut-off frequency The
E wave device 4 is connected in parallel to the cutoff frequency variable low pass separation p
wave device 5. [111111] EndPage: The outputs of the low frequency separation mud wave device
5 and the high frequency separation separation wave device 2 are respectively branched into two
and connected in parallel to the sound quality controllers 6 and 7, respectively. The tone
controller 6 is connected to the mixers 8 and 9, and the tone controller 7 is also connected to the
mixers 8 and 9. On the other hand, the outputs of the midrange separation F-wave devices 3 and
4 are respectively connected to the mixer 10, and the output of the mixer 10 is branched into
two and connected to the mixer 8 and the mixer 9. The outputs of the mixers 8 and 9 are
connected to a respective amplifier 11.12, and the output of the amplifier 11.degree. 12 is
connected to an output terminal 13.14, respectively, to construct a conversion device of a mono
signal to a stereo signal. ing. Next, the operation of the converter will be described. For example,
if an orchestra performance is received by a monophonic electrical signal converter (not shown),
the seven aural sounds obtained by the converter are divided into three components: high
frequency components, medium frequency components and low frequency components. 2, 3 and
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4 5 separate. Each Oki wave has the following performance. That is, the high frequency
separation F wave device 2 can continuously change the lower limit cutoff frequency in the range
of 3 KO / S to 8 KO / S, and the high frequency side cutoff frequency variable middle frequency
separation wave absorber 3 The upper limit cutoff frequency is continuously variable in the
range of 3 KO / S to 8 KO / S as in the case of the high-pass separating wave device. Further, the
lower cut-off frequency variable type middle band separation E-wave filter 4 can be continuously
varied within the range of 2000 / S to 6000 / S at the lower limit, and the low band separation Ewave filter 5 The upper limit cutoff frequency is variable in the range of 2000 / S to 600 C / S.
That is, for example, a speaker (not shown) is provided at the output terminal 13.14. When the
arrangement of the sound source (musical instrument) of the orchestra is such that the violin is
on the left and the contra path is on the right, the left speaker reproduces the sound of the violin
In the speaker of (2), the tone range (bandwidth) of the violin and the tone range (bandwidth) of
the contrapath are determined by varying the cutoff frequency of the E wave device 2, 3, 4 to
reproduce the sound of the contrapath. That is, for example, the sound of a violin is branched by
the high frequency separation E-wave device 2 and the middle frequency separation offshore
wave devices 3 and 4, and the sound of the contrapath is branched by the low frequency
separation mud wave device 5. Adjust each one.
Among the signals obtained in this way, the output signals of the high frequency separation wave
equalizer 2 and the low frequency separation wave E 5 are controlled by the sound quality
controller 6 in order to simultaneously control the phase and the volume. , 7 supply. The tone
controllers 6, 7 are configured as shown in FIG. That is, it has two input ends 21 and 22 and is
manually input to the mixer 25 via the variable function such as the attenuator 23.24. The
signals set to the desired level by the attenuator 23.24 are mixed by the mixer 25 into one signal.
Then, this signal is output through the source wave unit 26. For example, this F wave device 26
has a source wave device that emphasizes gradually as the frequency decreases to 200 to 6007
S, and as the frequency increases to 3 to 8 KO / S. By combining with a source waver that
attenuates, in addition to having a flat characteristic in the middle frequency band, in the bass
band, the emphasis amount is gradually increased (the Has a characteristic that the amount of
attenuation gradually increases as the frequency increases. Moreover, the emphasis and
attenuation characteristics of the sound quality controllers 6 and 7 configured in this way can
control the amount of emphasis and attenuation in conjunction with each other in a reciprocal
manner. For example, in the tone controller 6 having the characteristic of controlling the low
band l flat to the enhancement state and the high band from the flat to the attenuation state, as
shown in FIG. It is possible to enhance the signal 32 and attenuate the signal 31 by manpowering
the signal 31 and the signal 32 from the low-pass separating mud wave 5 to the two input ends.
Also, in general, by emphasizing or attenuating the volume of the signal with respect to the
frequency characteristic, the phase of this signal is changed. Therefore, it is possible to
simultaneously change the phase of the bass range and the treble range by emphasizing or
attenuating the bass range and the treble range. That is, only the low frequency and high
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frequency components of the sound quality controllers 6, 7 are mutually interlocked with the
sound quality controllers 6, 7 in the reverse direction with respect to the band in which the mid
band separation source wave units 3, 4 can be obtained. The phase "advance" and "delay" can be
adjusted. For example, as shown in the figure (when the tone controller 6 is controlled so as to
make the low range into a single digit) and the high range is made to be "delayed", the low tone is
"delayed" and the high range is advanced "How do you move back and forth? That is, if the high
frequency component from the high frequency separation wave separator 2 advances in phase
by the sound quality control unit 7 (controlled rl 111 111 EndPage: 2, the high frequency
component is emphasized.
On the other hand, the low frequency components from the low frequency separation offshore
wave unit 5 are controlled and emphasized as the phase advances in the sound quality controller
6. In other words, the tone controller 6 reverses high-pass attenuation and low-pass
enhancement and the high-pass boost and low-pass attenuation by the tone controller 7 and
gradually changes the boost or decay by simultaneously changing the phase rotation and the
volume change. It is what you get. That is, the tone range of the violin from the high frequency
separation source wave unit 2 controls the phase and volume with the sound quality controller 7,
and the tone range of the contra path from the low range separation source wave unit 5 with the
sound quality controller 6. Control phase and volume. The range of the contrast path emphasized
by the controller 6 and the range of the violin emphasized by the sound quality controller 7 are
supplied to the mixer 8.9. On the other hand, the middle frequency component of the violin is
determined in the upper and lower limit bands respectively by the high frequency side cutoff
frequency variable type middle frequency separation wave absorber 3 and the low frequency
side cutoff frequency variable type middle frequency separation source wave unit 4. To the mixer
10. The output signal of the mixer 10 is supplied to the mixers 8 and 9. In these mixers 89, a
plurality of manually operated signals are mixed via variable functions, so that the respective
input signals are mixed at a desired volume. That is, for example, if only the sound of the
emphasized violin from the sound quality controller 7 is supplied to the mixer 9 (the volume of
the signal from the sound quality controller 6 is controlled to be zero, the mixer 10 Mixed with
the mid-frequency component of the violin from Thereafter, the signal is amplified to a desired
value by the amplifier 12 and supplied to the left speaker. Further, in the mixer 8, the volume of
the signal from the tone controller 7 is controlled to be zero so that only the sound of the
emphasized contrast path from the tone controller 6 is supplied, and the desired value is set by
the amplifier 11. Amplified and supplied to the right speaker. Although the volume control may
change the gain of the amplifier 1112, a volume controller may be provided at each of the
outputs of the wave filters 2 and 3 ° 4.5. In this way, the tone range of the violin set in the high
frequency range and the tone range of the contra path set in the low frequency range are
determined by varying the cutoff frequency of the source wave units 2 and 34.5 as described
above. In addition, in order to locate the violin on the left side and the contrast path on the right
side, the speaker on the left side emphasizes the phase and volume of the violin's range and
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volume, and the speaker on the right side the phase and contrast range of the contrast path. The
violin and contrapath were localized to the left and right, respectively, by manpowering the
signal that emphasized the volume.
It can play back stereo sound with ideal volume effect and phase effect. As described above,
according to the present invention, according to the frequency band of the musical instrument
included in the monaural sound, the monaural sound is separated into the high frequency
component, the mid frequency component and the low frequency component, respectively. By
controlling the phase and volume of the high frequency signal and the low frequency signal
respectively and then mixing them with the mid frequency signal as appropriate, it is possible to
obtain an apparatus for converting a mono signal into a stereo signal that reproduces a stereo
effect. Therefore, although the above-mentioned fault is eliminated and the middle range is the
same signal, the volume and phase are simultaneously changed with respect to the high range
and the low range to obtain the effect of volume and phase necessary for forming a threedimensional sound image. In the middle range, localization can be performed at the center of the
sound image, and there is an effect that the sound image can be localized with extremely high
fidelity. In the above embodiment, the volume adjustment is adjusted by changing the gain of the
amplifier 11.degree. 12 or by providing volume adjusters at the outputs of the source wave units
2, 3 and 4, respectively. By providing a volume adjuster in the output circuit and configuring one
to operate to increase the volume, the other operates to decrease the volume, which is
advantageous in that the volume can be adjusted only for low frequency components and high
frequency components. In the above embodiment, although the formation of the violin and the
contrast is described, the voice of the singer is included in the mid-frequency component if the
voice of the singer and the musical accompaniment by the musical instrument are further
included as the monaural sound source 1. And separate the accompaniment musical tones into
high frequency components and low frequency components by adjusting the cut-off frequencies
with respective mud wave devices. The separated tones are further divided into right and left by
adjustment of the sound quality controller 67, and localized to the left and right of the voice.
Therefore, if the tone controllers 6, 7 are adjusted in accordance with the tone quality of any
musical instrument, the sound images of the same musical instrument can be dispersed (localized
at a desired position). Furthermore, the device according to the present invention is combined
with, for example, an existing monophonic record, and while reproducing the original record,
rllllllEndPage as a monaural sound source is supplied to the device according to the present
invention and converted to a pseudo stereo signal Recording the signal again has the advantage
of making a very ideal stereo recording board. (1) A method of separating and varying the
bandwidths of the monaural signal into high frequency, mid frequency and low frequency
components according to the frequency band of each sound source included in the monaural
signal, and A means for gradually enhancing and attenuating the high frequency components at
the same time by simultaneously performing phase rotation and volume change, and the low
frequency components in phase rotation and in reverse operation interlocking with the means.
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And means for gradually enhancing and attenuating by simultaneously changing the sound
volume, and mixing the frequency component of the mid range to the enhanced frequency
component of the high region and the attenuated frequency component of the low region to
obtain one of stereo signals Means for generating an output signal, mixing the midrange
frequency component with the high frequency attenuated frequency component and the low
frequency enhanced frequency component to generate the other output signal of the stereo
signal Comprising a stage giving effect effect and the phase volume conversion device into a
stereo signal monaural signal and forming a three-dimensional sound image.
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