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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram of a conventional acoustic
device, FIG. 2 is a block diagram of an acoustic device according to an embodiment of the present
invention, and FIG. 3 is a circuit diagram of the main parts of the device. FIG. 4 is a detailed
circuit diagram of the same device, and FIGS. 5, 6, 7 and 8 are circuit diagrams of main parts of
an acoustic device in another embodiment of the present invention. 7 ииииии Audio signal generation
circuit, 8 ииииии Frequency characteristic compensation circuit, 9 иии Switching circuit, 10 иии Amplifier
circuit, 11 иии и Synthesis circuit, 12 и и и и и и и delay circuit.
DETAILED DESCRIPTION OF THE INVENTION In the present invention, the stereophonic sound is
reproduced on a television receiver, and the seven aural signal is converted to pseudo
stereophonic sound and the expanded sound field is made by two speakers. The present
invention relates to an apparatus capable of enhancing the sense of reality in the case of sports
programs etc. Especially when performing pseudo stereo reproduction, it is possible to perform
good reproduction close to the natural 7 'sound, and the composition is simple. An apparatus is
provided. Conventionally, to reproduce monaural sound as pseudo stereo sound, as shown in FIG.
1, seven aural sound signals input from the input terminal 1 are respectively sent to the right
earphone 2R and the left earphone 2L of the headphone 2 It is known what to process and add.
That is, a part of the input signal from the input terminal 1 is delayed by the delay circuit 3 to
form a kind of echo signal, and this delayed signal is shifted to the appropriate phase by the right
phase shift circuit 4R and the left phase shift. The phase is adjusted by the phase circuit 4L. Next,
this adjusted signal is added to the right signal combining circuit 5R and the left signal
combining circuit 5L, and the delay signal and the human power signal from the input terminal 1
are mixed at an appropriate ratio, and the mixed signal is matched. In addition to the earphones
2R and 2L via the circuits eR and eL, the headphone 2 is driven. However, in such a conventional
apparatus, the circuits for adding the earphones 2R and 2Lv to each of the left and right
earphones are U, and the circuits for the phase shift circuits 4R and 4L, coupling%, sR and sL and
the matching circuits 6R and 6L are all (4) Because they are separate right, the left signal and the
right signal become unbalanced due to various variations such as variations in the used parts of
each circuit, variations in the adjustment state, and further variations in the constant caused by
aging. As a result, there is a drawback that the good three-dimensional sound feeling is impaired.
As a matter of fact, the circuit configuration is also complicated due to the need to use many lefthanded circuits like this, and VCfx is inevitably expensive, and it is almost the same as the audio
circuit of a ready-made television receiver. Since there is no dual purpose part, it is difficult to
use such prefabricated products simply as an adapter, and there is also the inconvenience that
the audio circuit has to be replaced almost completely. Therefore, the present invention solves
the conventional defects and can always obtain a good three-dimensional sound without the
possibility of signal variations, and moreover, most of the existing audio circuits can be used as
they are. Can be simple and inexpensive, and can be easily formed by addition of an adapter, and
can also perform good reproduction close to natural sound, especially in the case of pseudo
stereo sound It is an object to provide an apparatus.
The present invention will be described with reference to FIGS. 2 to 4 which show an
embodiment of the present invention applied to a pseudo stereo reproduction apparatus. In the
prior art apparatus shown in FIG. 1, when using a headphone, the delay signal is adjusted to an
appropriate phase relationship by two phase shift circuits 4R and 4L. When trying to obtain a
sense of pseudo 3D sound using a speaker, a signal (hereinafter referred to as a sub signal)
delayed with respect to the original signal (hereinafter referred to as a main signal) which is not
delayed has a phase of 00. Succeeded in obtaining effective external pseudo three-dimensional
sound effect by creating combined signal and combined signal with phase of 1800 and supplying
it to left speaker and clothes speaker respectively did. Thus, the present apparatus is based on
making the phase of the sub-signal different by 1,800 and add them to the respective signals,
and the above object is achieved by performing this addition by a special combining circuit. First,
in FIG. 2, reference numeral 7 denotes an audio signal generation circuit using an audio detection
circuit of a television receiver, and the low frequency television audio signal obtained here is
transmitted via the frequency characteristic compensation circuit 8 and the switching circuit 9.
After being added to the amplification circuit 1 o and amplified, the signal is supplied to the
synthesis circuit 11. On the other hand, when the pseudo three-dimensional sound effect is to be
obtained, a part of the signal is taken out from the switching circuit 9 and added to the delay
circuit 12, delayed for a predetermined time, and then added to the synthesis circuit 11. As
means for delaying this signal, the BBD element 7 is implemented by its clock circuit. First, the
signal from the switch circuit 9 is added to the BBD element 14 via the pre-stage filter 13 for
removing beat interference with the clock pulse and delayed by a predetermined time, and then
the post-stage filter for removing the clock frequency component In addition to 15, the signal is
further amplified by an amplifier circuit ?, 16 and then added to the synthesis circuit 11. 17A is
a clock pulse generating circuit. In the case of implementation in a television receiver, in order to
avoid beat noise between the horizontal pulse for horizontal deflection and the clock pulse for
the BBD element 14, for example, the output pulse of the horizontal circuit 17 'of the television
receiver is used. When the clock frequency for the BBD element 14 is synchronized, it is effective
to improve the S / N. The concrete circuit of the synthetic | combination circuit 11 is shown in
FIG. Here, a coupling circuit of two transformers 18.19 for signal coupling and two speakers 2OR
and 2OL is shown. In the figure, the main signal is added from the amplifier circuit 10 to the
primary winding of the first transformer 18 as a first audio output circuit, and the auxiliary
signal from the delay circuit 12 as a second audio output circuit 19 Add to the primary winding
Then, one end of each of the two speakers 2OR and 2OL is connected in common and connected
to one end A of the secondary winding of the first transformer 18, and the other end of the first
swing force 20R is a second The other end of the second speaker 2OL is connected to one end C
of the secondary winding 8 of the transformer 19 and the other end E of the secondary winding
of the second transformer 19 respectively. The other end B of the first transformer 18 and the
center tap D of the secondary winding of the second transformer 19 are connected. If connected
in this manner, the main signal applied from the amplification circuit 1o through the first
transformer 18 flows in the polarity as shown by the solid arrow in the figure and is supplied to
the speakers 20R and 2OL in phase. . Further, the sub-signals added from the delay circuit 12
through the second transformer 18 flow in the polarity as shown by the broken line arrows in
the figure, and have phases different from each other by 18o0 in each of the speakers 2OR and
2OL, ie, It is supplied in reverse phase. Therefore, the first speaker 20R is thereby pronounced by
the addition synthesis signal of the main signal and the auxiliary signal delayed for a
predetermined time, and the second speaker 2OL delays the main signal and this for a
predetermined time, and 1800 The sound is produced by the synthesized signal with the subsignal of which the phase is different, so that the synthesis of the sign as described above can be
satisfied and the sense of stereophonic sound can be effectively obtained. Furthermore,
according to such a synthesis circuit 11, in the secondary winding of the first transformer 18, the
main signals from the second transformer 19 flow in opposite directions around the midpoint
tazob D and cancel each other. Therefore, it is also possible to perform good external signal
synthesis without mutual interference by adversely affecting the side signal paths of the delay
circuit 12 or the like or not. Therefore, in this circuit, the second transformer 19 can be regarded
as absent or high impedance viewed from the main signal path, and conversely, the first
transformer 18 is absent from the secondary signal path. Since it can be regarded as a thing or a
thing of common impedance, both can be supplied to each speaker 2OR, 2OL without loss.
Among them, here the first. Assuming that the impedance of the second speakers 20R and 20L is
2, the ivavidance between AB of the secondary winding of the first transformer 18 is Z / 2, and a
secondary winding C of the second transformer 19 , And E, if the impedance is 22, the matching
condition can be optimized. In this circuit, only one normal transformer is used, and one extra
transformer is inserted compared to the correct speaker circuit, so its DC resistance (o, about 6 to
1 ?) is extra in series. Although the loss is slightly increased due to being connected, in the
present apparatus, since the signal amplitude is increased by combining the sub signal with the
main signal, such loss can be almost ignored.
In this way, pseudo stereo sound can be reproduced from a thousand aural sound signals, but the
delay circuit 12 used here to generate one signal generally has a bandwidth that can be generally
processed. Since the high frequency component can not be generated, the ratio of the high
frequency component is smaller in the pseudo stereo reproduction state than in the case where
the switching circuit 9 is switched to the 1000 aural reproduction state. And there is a
disadvantage that the feeling when they hear it changes. Therefore, in this device 3, the
frequency characteristic compensation circuit 8 of sieve area emphasis type is used, and when
performing seven aural reproduction, the signal supply to the delay circuit 12 is stopped by the
switching circuit 9 and the frequency characteristic compensation circuit 8 is shorted. Then, the
signal is supplied to the delay circuit 12 by the switching circuit 9 and the frequency
characteristic compensation circuit 8 is operated when pseudo-stereo reproduction is to be
performed. The high frequency component which is lost in the delay circuit 12 is included in the
main signal at an extra ratio so that the overall frequency characteristics at the time of pseudo
stereo reproduction are almost equal to the frequency characteristics at the time of seven aural
reproduction By doing this, it is possible to obtain good reproduction sound in any case, by
making the feeling when heard not different between the two. For example, if a BBD element is
used as a delay element and the clock frequency is about 15 KHz to obtain a delay time of 5 to
15 m5 ecfj degrees, i and D elements are transmitted including the characteristics of the filter
inserted before and after Since the highest frequency that can be achieved is approximately 5
KHz '12, the frequency characteristic compensation circuit 9 may be of a characteristic that
emphasizes components of approximately 5 KHz or more. FIG. 4 is a circuit diagram of a specific
outside-example of the apparatus described in FIG. The signal supply to the delay circuit 12 is
switched by the changeover switch 21 in the switch circuit 9, and the frequency characteristic
compensation circuit 8 is inserted in the main signal path in the case of pseudo stereo
reproduction to add a stereophonic effect, and attenuated by the side signal. It emphasizes the
high-frequency component in the main signal by the energy equivalent of the high-frequency
portion to be adjusted so that it feels almost the same sound as it is heard by the ear. The
tweeters 26R and 25L may be connected in parallel to the speakers 2OR and 2OL via the
capacitors 26R and 26L, respectively. On the other hand, at the time of pseudo stereo
reproduction, a signal is inputted to a delay element using a BBD element through a filter 13
consisting of a resistor and a capacitor.
When the BBD element 14 is used in 256 steps and driven by the chrono 13 synchronized with
the horizontal period of the television receiver as a clock, an audio signal, that is, an auxiliary
signal delayed by 63.5 ?sec О 256-16.25 m5 ec from the main signal is formed. It is possible to
obtain an appropriate three-dimensional effect. In the illustrated example, the clock circuit 17 is
an astable multivibrator that generates the necessary waveform and frequency for driving the
BBD element 14, and is incorporated in the integrated circuit element (MN3003) together with
the BBD element 14, This element is commercially available. Next, the delayed sub signal drives
the second transformer 19 through the post-stage filter 5 and the power amplification circuit 16.
Although a part of the side signal can be fed back to the delay element again from the post-stage
filter 15 to more effectively add an echo, there is no essential difference in the effect even if it is
omitted. Incidentally, in the synthesis circuit 11, when using the earphones to erase and listen to
the voice of the speaker as shown in FIG. 5, the switches 27R and 27L are switched in
conjunction with the earphone jacks, and 14 main signals Flow through the resistor 28 to the
earphone 29. That is, the first switch 27R is inserted in series to the first speaker 2OR, the
second switch 27L is inserted in series to the second speaker 2OL, and these are interlocked to
switch, and the first switch 27R is further switched. The earphone 29 may be connected between
the other contact point of the second terminal 19 and the intermediate output terminal of the
second transformer 19. In addition, when using stereo headphones, as shown in FIG. 6, using
switches 3oR and aoL that can be switched by the insertion of the handphone janok, left and
right earphones 32R via resistors 31R and 31L. , 32L can provide a three-dimensional sound
effect. At this time, the resistors 31R and 31L have the same resistance value, but the optimum
value is selected to optimize the volume, and for the subsignal, inserting both the resistors 31R
and 31L in series results in the main of the subsignal The combining ratio to the signal is made
smaller than the ratio when using the speaker. The headphone switching circuit as shown in FIG.
6 may be used because the ratio of the side signal to the raw signal is preferably around 2 when
using a speaker, while around 1 is suitable when using a headphone. Furthermore, FIG. 7 shows
another example in the case of inserting a tweeter.
In this case, since the tweeters 33L and 33R are connected between the terminals A and B of the
first transformer 18 via the capacitors, no sub-signal component flows in the tweeters 33L and
33R, but the sub-signals have low frequency in practice. There is no difference because it is
possible to obtain a pseudo stereo effect with only the components. The configuration shown in
FIG. 8 supplies the auxiliary signal from the delay circuit 11 to the first transformer 11 and
supplies the main signal from the amplifier circuit 9 to the second transformer 19 contrary to the
above embodiment. It is In this case, the connection polarity of one of the speakers 20L must be
reversed as shown. Above this, if connected, the first one. A main signal can be supplied in series
to the second speakers 20R and 20L16, and two speakers 2OR and 2OL can be driven by one
with the same current. Furthermore, although all of the embodiments described above are
devices for obtaining a pseudo stereo reproduction effect from a monophonic audio signal, the
present invention can also be used for a stereo reproduction device using sum and difference
signals. FIG. 4 shows a circuit diagram of one embodiment for that purpose. Here, the audio
signal generation circuit demodulates the stereo broadcast signal to create a signal of the sum of
the right audio signal and the left audio signal, and 34 demodulates the stereo broadcast signal in
the same manner. A difference signal generation circuit that generates a difference signal
between the signal and the left audio signal, and a level adjustment circuit that adjusts the level
of the difference signal to the level of the sum signal. The difference signal is switched by a
switch 36 in the switching circuit 9 and applied to the amplifier circuit 16. At this time, the
switch 21 switches the frequency characteristic compensation circuit 8 to short circuit. With
such a configuration, when a sum signal is applied to the first transformer 18 and a difference
signal is applied to the second transformer 19, both signals are added together in the first
speaker 17OR, and only the right audio signal is produced. In the second speaker 20L, both
signals are subtracted and only the left audio signal is produced, and stereo reproduction is
performed. Then, in this circuit, even when imbalance occurs in the amplification degree of the
amplifier circuit 10.16, crosstalk between both the left and right voices is generated, but the
balanced state of the magnitude of the generated voice is maintained. In the case of stereo
reproduction in this manner, the switch 21. 36 may be configured to remove the pilot signal
included in the stereo broadcast signal and automatically switch using a relay or the like. In
addition, even when performing stereo reproduction in this way, it goes without saying that the
circuit modification as shown in FIGS. 3-8 can be used.
However, resistance 28.31 R in FIGS. 31 L should be eliminated or appropriately selected to
make the current of the sum signal equal to the current of the difference signal. Furthermore, in
the above embodiment, the first one. Since the second, as an 18 voice output circuit 1st. The one
using the second transformer 18 ░ 19 has been described. As the second audio output circuit,
any other circuit such as an output circuit by an OTL circuit may be used. Moreover, according to
the present invention, it is needless to say that any delay element other than the BBD element
may be used as a signal delay means. (2) is connected in series and in parallel by two
transformers to realize an interference-free connection, so that the main signal and the sub signal
can be processed independently as a complete signal before driving the speaker, and both signals
are combined The circuit is extremely simplified because there is no need for an extra emitter
follower circuit, a resistor network, an amplifier for attenuation compensation, a phase inversion
circuit for the auxiliary signal, etc., and all the main signal systems are conventional circuits. As it
can be used as it is, there is little change in design when introducing the effect of this device to
the speaker system, and since additional design can be configured independently, the ease of
introduction on design and manufacturing is excellent. ing. If the two power amplifiers drive the
two sneakers separately after adding the main and side signals, it is necessary to adjust the
balance of the two signals and there is a concern that the aging will lead to an imbalance
However, with this device, the balance between the left and right volume can be performed
without adjustment as before, and only the ratio adjustment with the secondary signal can be
performed by the listener in the manufacturing process, and the setting of this ratio is also
balanced with the left and right. Even if it is not strictly strict, the difference in effect is not
known, and so it has an advantageous effect such as being advantageous. Furthermore, since the
frequency characteristic compensation circuit is provided, even when switching between
thousand aural reproduction and pseudo stereo reproduction, it is possible to change the
frequency characteristic when listening to the ear, and reproduce the sound favorably in any
reproduction. It is possible to Furthermore, the television audio signal is delayed using the BBD
element, and the clock pulse for driving the BBD element is generated in synchronization with
the pulse of the television shore signal Cr), In the BBD element, the horizontal synchronous
frequency component of the television sound signal and the clock pulse do not interfere with
each other to generate beat noise, and sound reproduction with good S / N characteristics can be
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