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Description 1, title of the invention
A second amplifier circuit comprising an audio output circuit of an acoustic device, and a
coupling transformer having a middle point output terminal and two output terminals producing
outputs of mutually opposite polarities; A second speaker; One end of the second speaker is
commonly connected to one output terminal of the first amplifier circuit, and the other end of the
first speaker is connected to one output terminal of the coupling transformer of the second
amplifier circuit. The other end of the second speaker is connected to the other output terminal
of the coupling transformer, and the other output terminal of the first amplification circuit is
connected to the middle point output terminal of the coupling transformer. Sound equipment.
3. Detailed Description of the Invention The present invention reproduces stereo sound, converts
a monaural signal into pseudo stereo, lip voice, and reproduces an expanded sound field by two
speakers to produce a sports program etc. It is an object of the present invention to provide an
apparatus capable of increasing the sense of reality in the case, particularly when performing
pseudo stereo reproduction, capable of reproducing with good sound quality with little noise
generation and having a simple configuration. In the prior art, it is known to process monoral
voice into pseudo stereo tone and to process the mono audio signal input from 1 to the right
earphone 2R and left earphone 2L of the headphone 2 respectively and add 0, ie, an input
terminal A part of the input signal from 1 is delayed by the delay circuit 3 to form an echo signal
of a kind, and the right signal phase shift circuit 4R and the left signal phase shift circuit 4L make
up the phase to all appropriate phase of this delay signal. adjust. Next, the adjusted signal is
added to the right signal combining circuit 5R and the left signal combining circuit 6LI / i: the
delay signal and the input terminal 1. ! The headphone input signal is mixed at an appropriate
ratio, and the mixed signal is added to the earphones 2R and 2L via the matching circuits eR and
eL to drive the headphone 2. However, in such a conventional device, the circuits for adding a
signal to the left and right earphones 2R and 2L are both left and right separately for the phase
shift circuits 4R and 4L, the coupling circuits EIR and 5L and the matching circuits SR and eL.
The left signal and the right signal become unbalanced due to various variations such as
variations in parts used in each circuit, variations in adjustment state, and variations in constant
caused by aging over time. There was a drawback that the three-dimensional sound was
impaired. Also, since many left separate circuits have to be used as described above, the circuit
configuration becomes complicated and inevitably becomes expensive, and moreover, most of the
shared circuits are used with audio circuits such as already-made television receivers and the
like. There is also the inconvenience that it is difficult to use these pre-made ones simply by
adding them to a ready-made one, and the audio circuit has to be replaced almost completely.
Therefore, the present invention eliminates such conventional defects and can always obtain a
good three-dimensional sound good feeling without the possibility of variations in signals, and
moreover, it is possible to use most of the sounds of the existing audio circuit as it is. A device
that can be made simple, inexpensive, and can be easily formed by an adapter type, and can also
perform good reproduction close to natural sound, especially in the case of pseudo stereo sound
production. The present invention will first be described with reference to FIGS. 2 to 7 which
show an embodiment implemented in a pseudo stereo reproduction apparatus.
In the apparatus of FIG. 1 of the prior art, when a headphone is used, the delay signal is adjusted
to an appropriate phase relationship by two phase shift circuits 4R and 4L. To obtain a good
sense of pseudo three-dimensional sound, a delayed signal (hereinafter referred to as main
signal) Yc that is not delayed original signal (hereinafter referred to as sub signal) ko '! The
synthesized signal added at the phase of and the synthesized signal added at the phase of 180
'(7) are created and supplied to the speaker in the left corner and the speaker in Ishikawa
respectively. Therefore, we succeeded in obtaining an effective pseudo stereophonic effect. The
apparatus is thus based on adding the phase '11800 of the side signal to the respective signals.
EndPage: 2 to 7 In FIG. 2, 7 is an audio signal generation circuit such as an audio detection
circuit of a radio receiver or a television receiver, and the low frequency signal obtained here is
an OTL using a 5 EPP circuit etc. In addition to the amplification circuit 8 of the form, after
amplification, it is supplied as a main signal to the synthesis circuit 9 including a speaker. On the
other hand, when the pseudo three-dimensional sound effect is to be obtained, a part of the
signal from the audio signal generation circuit 7 is taken out and added to the sub signal
generation circuit 10 and delayed by the delay circuit 11 for a predetermined time and then
synthesized as a sub signal. Add to The illustrated embodiment shows an example in which the
EED element and its clock circuit are used as the delay circuit 11 for delaying the entire signal to
generate the sub-signal. First, the signal from the audio signal generation circuit 7 is added to the
BBD element 14 via the pre-stage filter 12 for removing beat interference with the clock pulse
and the pre-emphasis circuit 13 for S / N improvement and delayed for a predetermined time.
Thereafter, the signal is taken out via the post-stage filter 16 for removing the clock frequency
component and the de-emphasis circuit 16f for improving the S / N, and is applied to the
synthesizing circuit 9 through 19 via the switching circuit 17. 20 is a clock pulse generation
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, using the output pulse of the horizontal circuit 21 of the television receiver.
Synchronizing the clock frequency for the BBD element 14 is effective in improving the S / N.
FIG. 3 shows a specific circuit of the synthesis circuit 9 and its peripheral portion. Here, in FIG.
10, which shows a coupling and combining circuit with two speakers 22R and 22L, from the
main signal 1 OTL type amplifying circuit 8 and adding an auxiliary signal from the coupling
transformer 19 of the delay circuit 10, 0 and 2 speakers 22R and 22L are commonly connected
at one end to connect one end 1c of the output terminal of the amplifier circuit 8, and the other
end of the first speaker 22R is connected to one end C of the secondary winding of the coupling
transformer 19 at the second end. The other end of the speaker 22L is a coupling transformer
Connect the other end Evc of the secondary winding respectively. The other end B of the output
terminal of the (9) amplifier circuit 8 and the center tap D of the secondary winding of the
coupling transformer 19 are connected. When connected in this manner, the main signal added
from the amplifier circuit 8 flows with the polarity as shown by the solid line arrow in the figure
and is supplied in the same phase as the speakers 22R, 22LIC. Also, the sub-signals applied from
the sub-signal generation circuit 10 through the coupling transformer 19 flow with the polarity
as shown by the broken arrows in the figure, and are in the positions different from each other
by 18 o 0 in each speaker 22R 122 L, Supplied with Accordingly, the first speaker 22R is
sounded by the addition synthesis signal of the main signal and the auxiliary signal delayed for a
predetermined time, and the second speaker 22L delays the main signal and this for a
predetermined time, and 180 ░. Since the sound is generated by processing the synthesis signal
with the sub-signal having a different phase, the synthesis of the signal as described above can
be satisfied, and a good three-dimensional sound good feeling can be obtained. Furthermore,
according to such a synthesis circuit 9, as shown in FIG. 3, the auxiliary signal from the company
combination transformer 19 in the amplifier circuit 8 flows in the opposite direction to each
other and the cancellation -10. Since the main signal from the amplifier circuit 8 flows in the
opposite direction around the center tap D and cancels out in the secondary winding of the
coupling transformer 19 without adversely affecting the main signal path It is possible to
perform good signal synthesis without mutual interference without fear of adversely affecting the
path. Therefore, in this circuit, the coupling transformer 19 can be regarded as absent or high
impedance in view of the main signal path, and conversely, the amplification circuit 8 is absent or
not observed in view of the sub signal path. Since both can be regarded as impedances, both can
be supplied to the respective speakers 22R and 22L without loss. Here, in the first. Assuming that
the impedance 2z of the second speakers 22R and 22L is set, the output impedance between the
output terminals AB of the amplifier circuit 8 is set as 4 impedances and stored as the impedance
22z between C and E of the secondary winding of the coupling transformer 19. , The alignment
state can be made the best. However, since an extra transformer is inserted in this circuit as
compared with the OTL speaker circuit that does not use a transformer in EndPage: 311, its
direct-weight resistance (about 0, 6 to 10) is additionally in series In this device, the loss of the
signal increases slightly, but since the signal amplitude is increased by combining the sub signal
with the main signal in this device, such a loss can be almost ignored. FIG. 4 is a circuit diagram
of a specific example of the device described in FIG.
The main signal is amplified by an OTL type amplifier circuit 8 such as a 5EPP circuit constituted
by an audio output IC element or the like, and is supplied in phase to two speakers 22R and
22LK in parallel at an OTL output. On the other hand, part of the signal supplied from the audio
signal generation circuit 7 is a BBD element (an IC 3003 and the like are commercially available)
via the pre-stage filter 12 composed of an active filter and the pre-emphasis circuit 13 with an
OR configuration VC. The delay time of the delay element 14 applied to the delay element 14
using 22) is determined by the clock frequency and the number of BBD stacks, and is made the
clock frequency kfcp, the BBD element element 2 film 0, and the BBD element 23 having 128
steps. If you use the one with about 4 m5 ec, if you use the one with 512 steps, the delay time of
about 13 ml 1 ec is obtained, the effect is slightly different, but in any case it is possible to obtain
a suitable three-dimensional effect. The delayed signal is removed from the component of the
clock pulse by the post-stage filter 16 formed of an active filter, and is taken out as a sub-signal
through the de-emphasis circuit 16 that compensates for the pre-emphasis. When a pseudo
stereo effect is to be obtained, the switching circuit 17 is closed, the sub signal is taken out, and
after being amplified by the amplifier circuit 18, the two speakers 22R and 22L are connected by
the coupling signal 4 for the sub signal. The clock generation circuit 2 o which is added in the
reverse phase and synthesized with the main signal is constituted by an astable multivibrator or
the like. It is not necessary to trigger with the horizontal sync signal, but since the horizontal
pulse is largely leaked to the audio demodulation signal of the television and the Yon receiver, it
should be synchronized with the clock pulse if it is triggered and synchronized with the water
sync signal. Beat noise with the horizontal pulse component is reduced and effective. The lowpass m1 stage filter 12 is for reducing the generation of beats between the input signal and the
clock pulse, and is not necessarily required when the clock frequency is high. The low pass type
post-stage filter 16 is for removing the component of the clock pulse contained in the output
signal from the BBD element 23. By the way, when a BLED element is used as a delay element of
a signal as described above, there is noise generated inside the element, and the subsignal
delayed through all the BBD elements is slightly degraded and the signal input level is very high.
When it is small, some noise is detected. Since the noise generated by the BBD element 23 has a
tendency of triangular noise which increases in proportion to the frequency in the frequency
spectrum, it is possible to improve the S / N'1 by providing the pre-emphasis circuit 13 and the
de-emphasis circuit 16. can do.
Also, the switching circuit 17 switches the supply of the sub signal 14,. As shown in the figure (if
it is installed at a later stage of the delay element 14 by VC or the like VC, it is possible to open
the switching circuit 17 when the pseudo stereo reproduction is not performed. , 22L, and S / JJdeterioration of reproduction by the main signal does not occur. If a part of the signal from the
amplifier circuit 18 is fed back to the input side of the delay element 14 through the entire
feedback loop 24, an echo can be effectively added, but even if omitted, the effect is essential
There is no When the earphones (headphones) are used in the synthesis circuit 9 to listen to the
voices of the speakers 22R and 22L, as shown in FIG. 6, the switch 25R, which is interlocked with
the earphone jacks, is displayed. 25L '(5 switches to make the main signal via resistance 26R,
26Lf earphone 271R. It only needs to flow in 27 L. That is, the first switch 26EL is inserted in
series to the first spring 22H, and the second switch 25LEndPage: 416-in series to all the second
speakers 22L, so that all of them are interlocked and switched Further, the earphones 27R127Li
are connected between the other contact of the first switch 2SR and the output terminals C and E
of the coupling transformer 19 to be left and right earphones 27R. By supplying a composite
signal to 27 L, a three-dimensional sound effect can be obtained. At this time, the resistors 26R
and 26Lij have the same resistance value, but while selecting the optimum value to optimize the
volume, both resistors 26R and 2eL are inserted in series for the subsignal, and The synthesis
ratio to the signal is modified less when using the speaker. The headphone switching circuit
shown in FIG. 6 may be used because the ratio of the side signal to the main signal of about 2 is
appropriate when using a speaker, while about 1 is appropriate when using a headphone.
Further, FIG. 6 shows an example in the case of adding a tweeter. In this case, since the output
terminal input of the amplifier circuit 8 is connected in series between the B via the tweeter 2B
and the 28Li capacitor 29, no side signal component flows in the tweeters 28R and 28LvC, but
the side signal is practically low. There is no difference because a pseudo stereo effect can be
obtained with only frequency components. 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 all sum and difference signals.
FIG. 4 shows a circuit diagram of one embodiment for that purpose. In that case, it is assumed
that the audio signal generation circuit 7 demodulates the stereo broadcast signal or the like to
create all the sum (R + L) signals of the right audio signal and the left audio signal. 3 ░ is a
difference signal / generation circuit that similarly demodulates a stereo broadcast signal to
create an (LR) signal of a difference from the right audio signal, 31 aligns the level of the
difference signal to the level of the sum signal It is a level adjustment circuit. The difference
signal is switched by a switch in the switching circuit 17 and applied to the amplifier circuit 18.
With such a configuration, when the sum signal is supplied from the amplifier circuit 8 to the
combining circuit 9 and the difference signal is supplied from the coupling transformer 19, both
signals are added together in the first speaker 22R and only the right audio signal is produced. In
the second speaker 22L "c, both signals are subtracted so that only the left sound is produced,
and stereo reproduction is performed. Further, in this circuit, even when imbalance occurs in the
amplification degree of the amplifier circuits 8 and 18, crosstalk between both the left and right
voices is generated, but the balanced state of the size of the generated voice is maintained. In the
case of stereo reproduction as described above, the switch 17 may be manually switched or may
be switched automatically by a relay or the like by removing a pilot signal included in the stereo
broadcast signal. It is needless to say that the above-described circuit modification can be used
also when performing stereo reproduction in this way. However, it is necessary to remove or
appropriately select the resistors 26R and 26L in FIG. 6 so that the current of the sum signal and
the current of the difference signal are the same. As described above, according to the noninvention, the connection of the two speakers 187 (or headphones) is realized so as to be
mutually interference-free and allow the signal total synthesis to be performed. The main signal
and the side signal can be processed independently, and it is a circuit because it does not need an
extra emitter-for-lobe circuit for combining both signals, a resistor network, an attenuation
compensation amplifier, a phase inversion circuit of the side signal, etc. Is extremely simplified,
and all main signal systems can be used as they are in the conventional circuit. Therefore, there
is little change in design when introducing the effects of this device into the speaker system, and
additional design can be configured independently. Therefore, the ease of introduction on design
and manufacturing is excellent. In addition, when the two speakers are separately driven by the
two power amplifiers after adding the main signal and the sub signal, the two signals are
separated. Adjustment is necessary, and there is a concern that the balance changes with age, but
with this device, the balance between the left and right volume can be made without adjustment
as before, and only the ratio adjustment with the secondary signal can be made If the user does
not know the difference in effect even if the setting of this ratio is not as exact as the balance
between left and right, it has an advantageous effect such as being advantageous with EndPage:
By providing a pre-emphasis circuit and a de-emphasis circuit before and after the BBD element
in Sarah, it is possible to reproduce a sound without noise and good sound quality, and using an
OTL type as the main signal amplifier circuit. It is possible to obtain a device with good sound
4. 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
detailed circuit diagram of the whole apparatus, and Fig. 6 and Fig. 6 are circuit diagrams of
essential parts of an acoustic device according to another embodiment of the present invention. 7
иииииии Voice signal generating circuit, 8 иии и и и и и и и и и и и и и и и и и и и и synthesis circuit, 1 o и и и и и и и и и и и и и
и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и Delay circuit, 12 ? 1 и 1 front
and rear filter, 13 ... ? pre-emphasis circuit, 14 и @ 1111 и delay element, 15 и и и Q post-stage
filter, 16 ? ? ? ? ? ... de-emphasis circuit, 17, dispute, - ... switching circuit, 1a, и и и и и clock
pulse generation circuit, 21 ииииии horizontal circuit, 22R, 22L ... ... - speaker, 23 ... top .. BBD
element . Name of agent Attorney Nakao et al. 1 person Fig. 1 Fig. 1 Fig. 3 "l 4 4 [, 22R22L11i3;
+, 8" knee 10. , 19 j-one gate. 1B = EndPage: 6 FIG. 89 EndPage: ?
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