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1 и Name of the invention ? inventor и Japan Patent Office published patent gazette и Japanese
Patent Application Laid-Open No. 51-2910 j-0 Japanese patent application 51. (1976) 3.12
Japanese Patent Application No. 4 q-702394, Specification 1, Title of Invention 1, Name of
Invention, Stereo Signal Forming Circuit for Dophone
3. Detailed description of the invention In this invention Fi, when listening to the head 7 on of the
stereo signal, between the source and the old, I head 7 on, in order to obtain the same listening
effect as the sound field listening by the general speaker system. The present invention relates to
a stereo signal forming circuit for turning on a head 7 which is used by being inserted. Although
a speaker system is generally used as reproduction means such as a stereo reproduction
apparatus, the head 7 on is also widely used in accordance with various purposes. General stereo
sources are premised on sound field hearing by speakers, but this state not only incidents but
also incident on the left ear as crosstalk ? Takeda R ', and the same can be said for the left
speaker In this case, R 'and L' are 1R and L respectively, and the time difference At (about 100 to
500 pSeC) corresponding to the arrangement angle ? of the speaker at that time, the
arrangement angle-and the frequency of the sound Level difference ?L corresponding to (Q ~
tsdBi! Degree). However, since there is no processing loss talk signal in general head 7 on
reception, listening to a stereo source like the above with a headphone causes localization of the
sound image to be different from that in the case of speaker listening. Not only the intention of
the producer is not properly reproduced, but also the increase in feeling of fatigue due to the
unnatural and natural sound image localization makes it extremely difficult to use for a long time.
As a method to solve this problem, it is considered to supply by means of some means such as a
loss talk signal tube, but several proposals have been made in the past, mainly to the level
difference ?L and the phase difference ?? of crosstalk signals. What has been focused on-And,
a system which uses a phase difference rL, C, R element corresponding to a fixed time difference
is proposed (for example, U.S. Pat. No. 3,088,997). However, using L, C and R elements to
accurately simulate phase difference and audio frequency over the entire spectrum
corresponding to a fixed time difference is difficult from the viewpoint of circuit design
technology. Most of the proposed tl and phase difference stains. It is only performed in the low
frequency range (less than 1-degree). Also, the phase difference simulation has a limit that it can
not realize the original meaning of the time difference and the j- "of the origin of one signal. This
-4: Simulated phase difference simulation, phase difference simulation, and t ? ? conducted to
introduce a crossed-to-the-seconds signal. In hearing by a headphone #i, a head 7-on-prior
without a cross-daughter signal is easy to hear However, since the sense of distance of the sound
image is poor and the sound image seems to be separated into the high range and the low range,
the outline of the sound image becomes unclear, and so on.
The present invention has been made in view of such circumstances, and it is possible to obtain a
clear sound image and an extra-head electric potential, $ t-, 1 plus a sense of presence increase,
and a head not feeling fatigue llA 7 The object of the present invention is to provide a stereo for
on-line, a signal forming circuit, and an embodiment of the present invention, in which both
channels of a stereo source, an input element ? stage for inputting a signal in the signal source,
and The delay means for delaying each by a predetermined amount, the mixing means for mixing
the output signals t and n of the respective delay means, and the original signal of the opposite
channel, and 1, the output tube of the mixing means to the stereo of each Output means for
sending to the right and to the left, t means for delaying means t, storage means, и и и и и и и Gate
means for transferring the charge of the storage means for L-1 and gate means To a charge
transfer system comprising pulse control means for controlling It is characterized by comprising.
Hereinafter, an embodiment of the present invention will be described with reference to the
drawings. FIG. 2 is a block diagram showing an embodiment, wherein left and right channel input
terminals 1, 2, and 3 for inputting both channel original signals of a stereo source. Sound quality
adjustment circuits 3, 4 both-channels l Delay circuit for delaying the east signal by a
predetermined amount 5.6 Both-channels level adjustment circuits 7, 8,. Mixers 9, 10, which mix
the delayed and level-adjusted signal with the original signal. Output of mixer 9, 10? It consists
of the left, right channel output terminals 1i, '12, etc., which are sent to the right and left of the
stereo headphone. It is for correcting the difference in sound quality due to the difference in the
method of supplying sound to both ears of the sound quality adjustment circuit 3 and 4ff
speakers and the head 7 on! It is preferable to connect to the input stage as shown in g2; even if
the sound quality adjustment circuit is equipped with a preamplifier etc. to which the input
terminal 1.2 of FIG. и Communication circuit 5, 61! It is configured in the form of one Kvt loadtransmission type to be described later, and has an r filter circuit at its front stage and rear stage.
The filter circuit connected in the previous stage is a component I which is aJ ? ? 19 higher
than the rc original signal in order to prevent interference between the clock pulse described
later and the original signal from the input terminal 1.2. . For delay circuits 5 and 6! , 7 crosstalk
of the time difference ?t of the crosstalk signal. The same pel adjusting circuits 7 and 8 are
subjected to 7 pairs of level differences ?L of n 1 crossed signals 411 from the attenuator and
the frequency characteristic adjusting circuit.
The characteristics of the filter circuit connected to the latter stage of the delay circuit described
above should be J: 5 for the frequency characteristic adjustment circuit, and the characteristics of
this frequency characteristic-adjustment circuit should be omitted. , And level adjustment circuits
8 and 7. And, the sound EndPage: 2 и I 'ipJ quality adjustment circuit 3.4 output respectively
mixer 9, 10fX * mixed and synthesized ti, te output terminal 11.12ff lead n и therefore, the left
channel Input terminal IK transmission 1t Also the original signal of left channel of stereo source
through tone control circuit 3t-left channel delay [send to circuit 5 n delayed by predetermined
time n, left left channel level adjustment i circuit 7 Thus, after being attenuated by a
predetermined level j, t, the right channel mixer 10 [send n, the original signal island of the right
channel is synthesized. The same operation is performed on the original signal of the right
channel sent to the right channel output terminal 2 to be synthesized with the original signal of
the left channel. Thus, from the left-channel output terminal] 1, a composite signal of the W
signal of the left channel and the original signal of the delayed and attenuated right channel is W
power n. The same operation n * composite signal is output from the right channel output
terminal 12 as well j. Now, according to the present invention, such delay circuits 5 and 6 have
fc! As shown in FIG. The load transfer method achieved by N, N, N3 delay circuit is an analog gate
wing. An analog gate 33, which is constituted by an electric storage @ 34.2 phase clock
generator 3sfk K, is controlled by clock pulses P and Q of the two phase clock generator shown
in FIG. The signal applied to the audio signal input terminal 31 is firstly stored as charge in the
first stage capacitor 34 through the first stage analog gate 33. And this charge is an analog gate
33t- every clock pulse. The signal is sequentially transmitted through n, and finally output to the
audio signal output terminal 32. Therefore, if the analog gate (and the number of capacitor
stages is N and the clock frequency is fc) is a two-phase clock in FIG. 3 f> f jj J, the delay time
?tfl, ?t is input to input terminal 31. It is represented by -N / 2f6. It is preferable to configure
using a charge transfer device such as' + evapsa, a nose blob (bucket brigade device), a CCD
(charge coupled device), a dual charge transistor, etc., and miniaturization is also possible. In
general, the circuit according to the present invention is convenient for adapting to the existing
one if it is mf- as an independent adapter used continuously between the preamp output terminal
and the main amplifier input terminal, but the Pg internal circuit It is also possible to incorporate
it into a pre-main amplifier etc.
Furthermore, in addition to the one or more mentioned large single-delays, the signal formation
circuit KLt L according to the invention is also capable of synthesizing a plurality of delayed
sounds. That is, if a plurality of delay circuits and level adjustment circuits are connected in
parallel, and the original signal of the stereo source and a plurality of delayed signals delayed by,
for example, ttm, 550 and 750 ?sec are synthesized, HtC 1) Advanced stains and crosstalk of
the crosstalk signal including sound diffraction and the like. It is also possible to simulate the
arrangement angle tube of several types of speakers. This is because the signal forming circuit
according to the present invention can be controlled independently of the time difference and the
level difference left pipe, and the delay time (time difference) can be arbitrarily set by the
number of stages of the delay unit. N5 Figure is the delay time of the circuit in Figure 2 and
Figure 3. 20 shows an example of the characteristic of the level attenuation amount with respect
to the frequency. Set the clock to 8 kHz and 25 KHz '. In order to confirm the first effect of the
present invention in which the delay time .DELTA.t-400 .mu.sec is obtained, the following
experiment was conducted using a circuit having a scale factor of 1 d. In the experiment of Jin,
the mixing is fl, so that the three instruments are at the center of the left and right speakers
respectively when one speaker is recorded and played back with one speaker as the original
signal as the original signal. The signal was nailed. T condition d1 (1) If X signal (2) One original
signal & C operation shown in FIG. 5 (a), (b) by the circuit according to the present invention?
Mixed signal to the same signal of the added signal to the same channel-MixedEnd 5EndPage: 3,.
. (8) One original signal has no delay time! s The signal to which only the operation of the
attenuation characteristic shown in FIG. 7B is added is mixed with the original signal of the
opposite channel. Three kinds of set. The subjects were 11 men and women aged 18 to 50 years
without hearing impairment in daily life. Fig. 6 is a summary of what the subjects of Ton et al.
Listened to the above three streaks with the head 7 on, and drawn the localization positions of
three musical instruments under each condition-(with the exception of two) A, fi , C ? f 1
potentials of the 13 musical instruments 1i 1 t-are shown и As is clear from this experimental
result, when the present invention Ex, a signal delay and mixing operation are performed
(condition (S)) In K, there is a sense of potential of the sound image in front of the head. Also, the
subject's answer and the degree of comfort in the atmosphere are in the order of condition '(Th
condition (8) 1 condition (1)' The fact that you are the inventor of the invention is TSE.
[,-Phase difference corresponding to foot time difference? ?? When compared to the
conventional example in which phase difference simulation is performed using C and R
confections, sound images subject to VC potential on the left and right% speakers are listened to
by the method of t, j by t j, and when it is large Is the localization position when no operation is
added to the eaEL pERu original signal shown in FIG. 17, and PmFL is a localization position # by
the phase difference simulation 4-7. GR2GL and HR, HL show the localization position when
listening to the signal operated by WfIK at a time according to the present invention, GR-, GL are
early-delay, output, 1-it, 16 delays with multiple delays . L, Rij, fl, jerk, sound of the right
channel? It shows. As described above, according to the present invention, the limitation of the
phase difference, as described above, is overcome. In other words, one shot jll? "Since the time
difference original meaning ? и tf '1" of 1 Buddha Buddha is simulated over the entire audible
range n-1 point of sound image CI) clear "░" sense of distance In the phase difference stains,
Rage, and LD also become r's or VC 'f's (happiness). And, in the case of multiple delays, it is also
possible to simulate many delayed sounds through the head and the back and above the head. As
it can, the best result shown in Figure 7 is obtained. As described above, as shown in the
examples and experimental results, the effects of the invention are as follows. (1,) A sense of
potential of the sound image is felt in front of the head. (2) The contour of the sound image
becomes clear, and subtle positional differences of the instrument can be classified. Presence is
increased as a result of (&) (lee). (4) The feeling of fatigue at the time of listening is reducedFurthermore, it is a matter of course that the present invention is not limited to the abovementioned one embodiment.
4. Brief description of the drawings. FIG. 1 is an explanatory diagram at the time of sound field
listening, FIG. 2 to FIG. 7 show the present invention [: $ 1 an embodiment, FIG. 2 is a schematic
block diagram, m3 FIG. 4 is a circuit diagram, FIG. 4 is a waveform diagram, FIG. 5 is a graph
showing delay and attenuation characteristics, and FIG. 6.7 is a localization diagram showing
experimental results of the present invention. 1.2 и и и и и и и Input means (left and right channel
input terminals) 3.4 и и и и и и и и tone control circuit 5.6 и и и delay means (left and right channel delay
circuit) 11. 12 и и и ... output means (the left and right channels mechanic force terminal) ? .........
Anamigugeto M иииииииии dormitory the Utsuwaa ......... 2-phase Kurotsu Kuji Enoya ''; applicants
Sakurai Nita Ryokushi Agent agent patent attorney Yui Arai,-,. ??? ? 1 EndPage: 4 Ц 1 Tough
I Ц 3 6 to tC 14) V5 Ц 6 ? ? Article (cow rnjk <+ tx) j! zn (M, End Page: 5 = = draft = = person
set) Patent applicant address Tokyo direct ? и и 2 1-10 substitute-person September 2 , Patent
applicants 1) Haradabathiko Higashi Tobu Setagaya-ku Kitayamayama 4-31-10 cherry blossoms,
Ihito. Title of the invention "Stereo signal formation circuit for headphones" For the above E
invention described in the attached specification and drawings, A * June June 1 Please be sure to
prove that there are any documents that you have announced in the attached document. Title of
the invention "Stereo signal formation circuit for headphones" For the above E invention
described in the attached specification and drawings, A * June June 1 Please be sure to prove
that there are any documents that you have announced in the attached document. Prove the
above. "September 2, 1974 EndPage: ?
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