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JPH03250900

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DESCRIPTION JPH03250900
[0001]
FIELD OF THE INVENTION The present invention relates to a headphone reproducing apparatus
for realizing localization outside a head of a sound image in headphone reproduction in a
television or the like. Prior Art FIG. 7 shows a block diagram of a conventional headphone
reproduction apparatus. In FIG. 7, 1 is an audio reproducing apparatus such as a CD for
reproducing stereo audio signals, 2 is a stereo amplifier for amplifying stereo audio signals, and
3 is stereo headphones. In FIG. 7, the stereophonic sound signal output from the sound
reproduction apparatus 1 is amplified through the stereo amplifier 2 and reproduced
independently by the stereo headphones 3 to the left and right ears. SUMMARY OF THE
INVENTION However, in the configuration as described above, as is well known, a sound image
generated by an acoustic signal can be formed in the head or in the vicinity of both ears, and has
a sense of unnaturalness and fatigue. The problem was that the The present invention has been
made in view of the above problems, and provides a headphone reproduction device that realizes
localization outside the head of a sound image also in headphone reproduction and can perform
reproduction similar to that in normal speaker reproduction. Means for Solving the Problems In
order to solve the above-mentioned problems, the hesodophone reproducing apparatus of the
present invention comprises an image sound reproducing means for reproducing a stereo sound
signal and an image signal, an image reproducing means for monitoring an image signal, and an
audio signal. To generate a spatial crosstalk signal of the signal and first and second input means
for inputting 2nd. Third. Fourth crosstalk generation means, first and second reflection sound
generation means for generating spatially reflected sound and reverberation sound, signal input
to first input means, and first reflected sound generation means First addition means for adding
the signal output from the second crosstalk generation means, the signal output from the second
crosstalk generation means, and the signal output from the fourth crosstalk generation means,
and the second input means A second addition means for adding the received signal, the signal
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output from the second reflected sound generation means, the signal output from the first
crosstalk generation means, and the signal output from the third crosstalk generation means A
first and a second amplification means for amplifying the added signal, and a headphone for
independently reproducing the output signals of the first and second amplification means to the
left and right ears, respectively. Operation The present invention adds visual effects by
simultaneously reproducing an image synchronized with an audio signal with the abovedescribed configuration, and further produces a normal stereo speaker reproduction and does
not occur in stereo-to-sodophone reproduction, the left channel By compensating the spatial
crosstalk signal of the signal and the right channel signal and the influence of the room (reflected
sound) at the time of headphone reproduction, it is possible to externalize the head of a sound
image in headphone reproduction.
Embodiment A headphone reproduction apparatus according to an embodiment of the present
invention will be described with reference to the drawings. FIG. 1 is a block diagram of a
headphone reproduction apparatus according to an embodiment of the present invention. In FIG.
1, 5 is a stereo audio signal and a video decoder for reproducing a video signal synchronized
therewith, 6 is a television for monitoring video, 7.8 is an input terminal for inputting a stereo
audio signal, and 9.17 is an input terminal A filter circuit that provides an amplitude frequency
characteristic to a signal input at 7 ░ 8. A delay circuit that delays the input signal by a certain
time 10.18. An amplitude frequency characteristic that provides an input signal to the input
signal. A reflected sound generation circuit that delays the signal by a certain time and multiplies
the delayed signal by a value, 12 ░ 15 is a filter circuit that provides an amplitude frequency
characteristic to the input signal, 13.16 is input 19.20 is a delay circuit for delaying a signal by a
certain time, 19.20 is an addition circuit for inputting a plurality of signals, multiplying each
input signal by a certain value, and adding them, 21.22 is An amplifier circuit for amplifying the
force signal, 23 is a headphone to reproduce independently the input audio signal to the left and
right ears. The operation of the headphone reproduction apparatus configured as described
above will be described using the drawings. First, a stereo audio signal (hereinafter, the left signal
of the stereo signal is called Lch and the right signal is called Rch signal) and the video signal
synchronized with the audio signal are reproduced by the video deck 5. The video signal is input
to the television 6 and the video is reproduced. The stereo sound signal is input to the input
terminal 7.8. At this time, it is assumed that the Lch signal is input to the input terminal 7 and
the Rch signal is input to the input terminal 8. Then, the input signals are respectively input to
the reflected sound generation circuit 11.14 and the reflected sound is added. Here, the reflected
sound refers to a reflected sound from a wall or the like generated when the input stereo signal is
reproduced by a speaker in a normal lighting room. FIG. 2 shows an example of a specific
reflected sound generation circuit. In FIG. 2, 24 is a delay element (.tau., .About..tau. N: delay
time) for delaying the signal by a given time respectively, and 25 is a multiplier for multiplying
the output signal of each delay element 24 by a certain value ( A, ~ Ao-squared value, 30 is an
adder. The value of the heat sink and the delay time of the delay element are determined from
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the result of actual measurement of the structure of the reflected sound in a normal lighting
room or the like, and the value of the reflected sound structure obtained by the simulator
simulation.
For example, FIG. 3 shows a reflected sound structure obtained by computer simulation, in which
the vertical axis is amplitude and the horizontal axis is time. As shown in FIG. 3, when the delay
time of the reflected sound is T1 to T4 and the amplitude is 81 to B4, .tau.l.noteq.T1, A1-B. +2
"'T2 Tl, A2" "B2?B" "+ 1" 2, A8 "BBr2" +4 "8"! "Set as Bt. The output signals of the reflected
sound generation circuit 11.14 are each branched into two, one being input to the addition
circuit 19.20 and the other being input to the filter circuit 12.15. Since the filter circuit 12
generates a signal corresponding to the reflected sound signal reproduced from the left speaker
and reaching the right ear at the time of normal speaker reproduction with respect to the Lch
signal, the crosstalk characteristic measured in the anechoic chamber etc. Filtering is performed.
Similarly, in the filter circuit 15, filtering is performed on the Rcll signal to create a signal
corresponding to a reflected sound signal that is reproduced from the right speaker and reaches
the left ear during normal speaker reproduction. The output signal of the filter circuit 12.15 is
input to the delay circuit 13.16 and delayed by the delay time of the crosstalk signal, and the
output signal of the delay circuit 13 is added to the adding circuit 20 and the output signal of the
delay circuit 16 is added It is input to the circuit 19. In FIG. 4, 26 indicates the left signal
speaker, 27 indicates the right signal speaker, 2B indicates the human head, and DLL indicates
the left ear to the left ear. Direct sound + DLl reaches left ear to right ear Direct sound DIlN
reaches right ear from right speaker Direct sound DIL reaches right ear from right speaker Direct
sound RLL reaches left ear from left speaker sound. RLI is a reflected sound that reaches the
right ear from the left speaker. R111 is a reflected sound that reaches the right ear from the right
speaker RIL is a reflected sound that reaches the left ear from the right speaker, and FIG. 5 shows
the delay time of the crosstalk signal set in the delay circuits 13.16 and 10.18. It is a figure
explaining quantity. In FIG. 5, 29 is a human head, point F is the position of the speaker, the point
is the left ear, and point E is the right ear. In this figure, assuming that the sound is radiated from
the point F, the point F is round and the difference in distance of H to the ear is DG when the
point having a distance equivalent to the distance 11EF on the straight line DF is G. Therefore,
assuming that the speed of sound is C, the delay amount T for crosstalk is T?1 / C (seconds).
The delay time of each delay circuit is set in this way.
The signal input to the input terminal 7.8 is input to the filter circuit 9.17. The filter circuit 9
generates a signal corresponding to crosstalk of Lch direct sound, and the filter circuit 17
generates A signal corresponding to the crosstalk of Rch's direct sound is generated. That is, in
the filter circuit 9, filtering of crosstalk characteristics of direct sound reproduced from the left
speaker and reaching the right ear in normal speaker reproduction is reproduced in the filter
circuit 17 from the right speaker in normal speaker reproduction to the left ear. Filtering of the
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crosstalk characteristics of the arriving direct sound is performed. The output signals of the filter
circuits 9 and 17 are respectively input to the delay circuit 10 ░ 18 and delayed by the delay
time of the crosstalk signal, and the output signal of the delay circuit 10 is output to the charge
circuit 20 and the output signal of the delay circuit 18 Are input to the charge circuit 19. In the
charging circuit 19, the Lch input signal is plus one, the output signal of the reflected sound
generation circuit 11 minus one, the output signal of the delay circuit 16 minus one, and the
delay circuit one day The output signal is multiplied by plus one, each of which is weighted and
output to the amplifier circuit 21. In the charging circuit 20, the Rch input signal is plus one, the
output signal of the reflected sound generation circuit 15 is plus one, the output signal of the
delay circuit 13 is plus one, and the output of the delay circuit 1o. The signal is multiplied by
plus one, each of which is weighted and output to the amplification circuit 22. However, since the
signs of the multiplication values of the input signals in the charging circuits 19 and 20 are for
changing the phases of the Lch signal and the Rch signal and making them uncorrelated, they
may be opposite to each other. Next, the amplification circuit 21.22 amplifies each input signal
and outputs the signal to the headphone 23, and the headphone 23 reproduces the acoustic
signal to the left and right ears. The crosstalk characteristics of the filter circuit 12.15 and the
filter circuit 9.17 are assumed to be different from each other in sound incident direction, for
example, direct sound is incident from 30 degrees direction and indirect sound is incident from
60 degrees direction. Set as. As a matter of course, the localization of the sound image differs
depending on this characteristic, and various acoustic image localization can be realized by
making this characteristic variable. Similarly, the delay times of the delay circuits 13.16 and
10.18 are set to different values. In addition, the reflected sound generation circuit 11.14 adds a
reverberation signal generated by combining circuits in which the input signal is feedbanked as
in the all-bus filter as shown in FIG. It will be close and you will be able to show more effects.
In FIG. 6, 31, 35, 36 are multipliers, 32. 33 are electric generators, and 34 is a delay unit.
Further, g represents a gain and ? represents a delay time. Further, in this embodiment, in the
charging circuit 19.20, the input signals are multiplied by values different from each other in the
code, but instead of performing multiplication, the phase characteristics of the input signals are
controlled to be different. The correlation can be made variable, and the localization of the sound
image can be controlled more finely. Although the sound signal is stereo, it goes without saying
that the effect is the same even if the monaural signal is branched into two and input. As
described above, according to the present invention, the image sound reproducing means for
reproducing the stereo sound signal and the image signal, the image reproducing means for
monitoring the image signal, and the first one for inputting the sound signal. A second input
means and a spatial crosstalk signal of the signal; 2nd. Third. The fourth crosstalk generation
means and the spatial reflection sound and the reverberation sound are generated. A second
reflected sound generation means, a signal input to the first input means, a signal output from
the first reflected sound generation means, a signal output from the second crosstalk generation
means, First addition means for adding the signals output from the crosstalk generation means of
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No. 4; a signal input to the second input means; a signal output from the second reflected sound
generation means; A visual signal consisting of a signal output from the crosstalk generation
means and a second addition means for adding the signals output from the third crosstalk
generation means, by simultaneously using an image signal synchronized with the acoustic signal
By adding an effect and by adding a signal such as crosstalk, it becomes possible to reproduce
the state in normal speaker reproduction at the time of headphone reproduction and to realize
the out-of-head localization also in the case of headphone reproduction.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a block diagram of a headphone reproduction apparatus according to an embodiment of
the present invention, FIG. 2 is a block diagram of a reflected sound generation circuit according
to an embodiment of the present invention, and FIG. 3 is a reflected sound generation according
to the embodiment of the present invention Amplitude characteristic diagram of the circuit, FIG.
4 shows the relationship of the radiation signal at the time of normal speaker reproduction, FIG.
5 explains the delay time set in the delay circuit in one embodiment of the present invention, FIG.
FIG. 7 is a block diagram of a reflected sound generation circuit according to another
embodiment of the present invention, and FIG. 7 is a block diagram of a conventional headphone
reproduction apparatus.
5 иии Video и и и и и и и и и и и Television 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 filter
circuit 10.18 и и и и и Delay circuit 11.14 иииииииии Reflected sound generation circuit, 12.15 иииииии Filter
circuit, 13 ░ 16 иии Delay circuit, 19.20 ииииии Addition circuit, 21.22 и и и и и и и и и и и и и и и и и
Headphones.
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