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JPH0212299

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DESCRIPTION JPH0212299
[0001]
[Object of the invention] (Industrial field of application) The present invention relates to a sound
field effect adding apparatus for adding sound field effects such as presence (surround effect),
reverberation and echo to an audio program signal, which relates to an audio program unit.
TECHNICAL FIELD The present invention relates to a sound field effect automatic control device
for reducing a sound field effect. (Conventional art) Conventionally, a device for adding the
above-mentioned sound field effect to an input audio program signal has a tone program section
mainly composed of a tone signal and a sound program section mainly composed of an audio
signal. Sound field effect will be applied. If a sound field effect is applied without distinguishing
such signals having different properties, the tone quality etc. of the tone signal will be improved,
but the clarity of the speech signal such as an announcement will be lost. (Problems to be Solved
by the Invention) The present invention eliminates the above-mentioned problems and provides a
sound field effect different from that of the input audio program signal in the musical tone
program and the audio program unit. , II aims to provide equipment. According to the present
invention, there is provided a sound field effect adding device for adding a sound field effect to
an audio program signal, wherein the variable portion and the flat portion of the envelope in the
input audio program signal are shown. Based on the output from the syllable detecting means for
outputting a value signal and the output from the detecting means, it is judged whether the input
audio program signal is a musical tone program signal main body or a voice program signal main
body. When determining the FJJ substitution, the number of arrivals of a signal indicating that it
is a voice program unit is determined by the number of arrivals of a signal indicating that it is a
tone program, and switching from the tone program unit to the voice program unit And logic
circuit means for judging by In the case of an audio signal, the variation of the envelope with
respect to the signal is greater than that of the tone signal. According to the present invention, it
is determined whether the musical tone program unit or the audio program unit is based on the
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number of fluctuating parts of the envelope, and the first and second determination signals are
output. When the musical tone program section is determined from the state that it is determined
to be a voice program [] drum section, the musical tone program in the second determination
signal counts the number of arrivals of the signal, and the sound field is exceeded when the
predetermined value is exceeded. Generate a control signal that switches the effect from weak to
strong. When the voice program section is determined from the state determined to be the
musical tone program section, the number of arrivals of the signal indicating the audio program
in the first determination signal is counted, and the sound field effect is weakened when
exceeding the predetermined value. To generate a control signal that switches from.
As a result, for example, when many audio signals are included in the audio program signal, the
sound field effect is mitigated, and when the opposite sound signal is dominant, the sound field
effect can be fully applied. The present invention will be described by way of the illustrated
embodiments. FIG. 1 is a block diagram showing a basic configuration of a sound field effect
automatic control apparatus according to the present invention. In the figure, TP1 is an input
terminal to which a sound field effect is added and to which the input audio program signal
before it is introduced, and TP2 is an output terminal of an audio program signal to which the
sound field effect is added. 1 is a sound field effect circuit for adding a sound field effect such as
surround, 2 is a syllable detection circuit for outputting a binary signal indicating an envelope
fluctuation part and a flat part in an audio program signal, 3 is a logic circuit according to the
present invention, 4 is a It is a switch circuit configured by an analog multiplexer or the like
having two signal paths whose conduction and non-conduction states are controllable. The
terminal TPI is connected to the sound field effect circuit 1. An audio program signal is led to one
of the signal paths of the syllable detection circuit 2 and the switch circuit 4. Further, an audio
program signal to which the sound field effect from the sound field effect circuit 1 is added is led
to the other signal path of the switch circuit 4. Thus, the logic circuit 3 according to the present
invention performs count operation and logic judgment operation which will be described below
based on the binary signal from the syllable detection 2 to control each signal path of the switch
circuit 4 to be conductive or nonconductive. Control signal is generated. First, a specific example
of the syllable detection circuit 2 will be described with reference to FIG. In FIG. 2, TP3 supplies
an input audio program signal to one of the two input terminals of the analyzer 1] converter 5.
The other input terminal of the analog comparator 5 has a threshold voltage for detecting a
fluctuating portion of the envelope, for example, a trimmer component such as a variable
resistor, in order to distinguish a musical tone program portion and an audio program portion in
the input audio program signal. Is set and applied. As a result, the analog comparator 5 obtains a
signal that distinguishes a flat portion where the amplitude of the input audio program signal is
larger than the threshold voltage and a small variable portion. The output of the analog
comparator 5 is input to the retriggered monostable multivibrator 6. This monostable
multivibrator 6 has two output terminals Q,? The output is taken out, one Q output is supplied to
one input end of the NAND gate 8 through the waveform shaping circuit 6a configured by a
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diode and a capacitor, etc., and the negative output is supplied to one input end of the NAND gate
7.
The output of the NAND gate 8 is supplied to a retrigger monostable multivibrator 9, which feeds
back the negative output to the other input of the NAND gate 8. From the monostable
multivibrator 9 having this configuration, it is possible to obtain a binary signal in which all the
variable parts are detected regardless of the time width of the variable part of the input audio
program signal. This binary signal also enters 11 at the other input of the NAND gate 7 and is
logically compared with the output from the monostable multivibrator 6. The monostable
multivibrator 9 is set to have a metastable period longer than that of the monostable
multivibrator 6, whereby the output of the NAND gate 7 represents a binary signal in which only
the fluctuation part longer than a predetermined time is picked up. It will be. The reason for
picking up the variable part indicated by the binary signal longer than a predetermined time
width is based on the nature of the h recovery signal. Next, the configuration of the logic circuit 3
will be described. In FIG. 3, terminal TP5- derives a binary signal from terminal TP4 which is J3
in FIG. The binary signal from the terminal TP5 is composed of the flip flop circuits 11a and 11b
and the AND gate 11c and is input to the falling edge detection circuit 11. The falling edge
detection circuit 11 is configured such that each of the seven chips 70a and 11b operates in
response to a clock signal from the clock generator 10. The detection pulse indicating the falling
of the binary Shintan is derived from the AND gate 11C and enters the (first) counter 13. The
counter 13 supplies the count output to the (first and second) comparators 15.1G through the
latch function flip-flop array 14. The comparators 15.1B compare the resist value from the
register 17.18, which has been set in advance, with the count value from the flip 70 slide row 14.
Then, these comparison results are input to the one end of the latch circuit 21 and the AND gate
24 through the knot gate 25 and the output of the comparator 16 is transmitted through the
AND gate 23 (second ) Is input to the counter 19. The counter 19 counts the output of the
comparator 16 through the ant gate 23, using the register value set in the register 20 as an
overflow value. Therefore, when the register value set in the output register 20 of the
comparator 16 is exceeded, the counter 19 outputs an output as a carry signal to the other end
of the latch circuit 21 and the ange 1-24 via the knot gate 26, respectively. Supply.
On the other hand, the counter 12a and the flip flop 12b. The circuit configured by 12c is a clock
from the clock generator 10 (a timing signal generation circuit operated by the rffi number). The
timing signal generation circuit 12 outputs a signal for clearing the force 1 limiter 13 from the
flip 70 tab 12 b and a signal for causing the flip flop 14 to latch the signal from the flip flop 12 C
and supplies it to a predetermined circuit. There is. The audio program signal is divided into
predetermined unit sections by the outputs of the flips 70b 12b and 12c. The output of the flip
flop 12 c is also supplied to the other input end of the AND gate 23. The clock generator 10 also
drives the counters 13 and 19. Thus, the latch circuits 21 are respectively connected to the
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comparators 15. An output based on the counter 19 is led to the terminal TP6 through the flip
flop 22. The signal derived from the terminal TP6 serves as a control signal for controlling the
switch circuit 4 in FIG. Next, the operation of the above configuration will be described with
reference to FIG. 4 and FIG. FIG. 4 is a timing chart showing the operation of the syllable
detection circuit 2. In the figure, the signal SO represents an input audio program signal, S1
represents the output of the comparator 5, S1 represents the Q output of the monostable
multivibrator 6, S2 'represents the output of the waveform shaping circuit 6a, and S3 represents
a monostable multi S4 represents the output of the vibrator 6, S4 represents the output of the
monostable multivibrator 9, and S0 represents the output of the NAND gate 7, which is a binary
signal of the present invention. The input audio program signal has a waveform such as a portion
X where the amplitude is flat, a portion Y where the amplitude is intermittently interrupted, a
portion X 'where the distance is small but which is more continuous than Y as indicated by SO.
Present a part. In this embodiment, the portions X and X 'are determined to be a tone program
portion, and the portion Y is determined to be a voice program portion. Based on this, the
comparator 5 outputs a pulse each time the amplitude of the input audio program signal exceeds
a predetermined level. Therefore, the signal S1 becomes a pulse train signal Y continuous or
interrupted in the form of burst corresponding to each cycle waveform of the input audio
program signal. And, the portion of the pulse train corresponds to the portion of the input audio
program signal whose amplitude is larger than a predetermined level.
Next, since the monostable multivibrator 6 has a metastable period set based on the maximum
frequency of the input audio program signal, it exhibits a high level during a period in which the
pulse train of the signal S1 continues and does not generate a pulse. Believe low level 5? Derivate
S2 as Q output. The mutual output S3 is a signal obtained by inverting S1. Further, the signal 82
'is a pulse train in which the rising of the signal S2 is detected. On the other hand, the output 84
of the NAND gate 8 will be the same signal as 82 'if the fluctuating portion of the amplitude
occurs at an interval longer than the metastable period of the monostable multivibrator 9, but
like the X' portion, When it occurs at an interval shorter than the metastable period of the
monostable multivibrator 9, the monostable multivibrator 9 is inverted with a pulse
corresponding to the first portion, and the interglacial strip and the subsequent pregnancy piece
are not detected. Thus, from the NAND gate 7, a binary signal S6 which changes to a high level
and a low level corresponding to the amplitude fluctuation part longer than a predetermined time
width and the continuous part of the amplitude is obtained. Next, the binary signal generated as
described above enters the falling edge detection circuit 11. In FIG. 5, the same signals as in FIG.
4 are assigned the same reference numerals. S7 indicates the output of the rising edge detection
circuit 11, 88.89 indicates the output of the flip 70 tab 12c and 12b, 810 indicates the output
value of the counter 13, 311 indicates the output of the comparator 15, and 812 indicates the
output of the comparator 16. 313 is an output of the AND gate 23, 314 is an output of the AND
gate 824, S15 is an output of the knot gate 25, 816 is an output of the knot gate 26, and 317 is
an output of the flip 70 tab 2 of this invention Respectively. Now, since the signal $ 7 output
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from the falling detection circuit 11 detects falling of the binary signal, it is a signal that exhibits
a pulse each time the amplitude fluctuation part is generated. This signal S7 is input to the
counter 13 and counted. In this case, the counter 13 is cleared by the signal @ S9 from the flip
flop 12b. Thus, the counter 13 counts the number of amplitude fluctuation parts in a fixed unit
period. The count value thus counted is transferred to and output from the 7-rip flow buffer 14
at the timing of the signal S8. The comparators 15 and 16 compare the count value from the flip
flop 14 with the resist value set in each register 17.18.
Here, the value set in the register 17 is determined based on the occurrence frequency of the
amplitude fluctuation unit that can be determined as the audio program unit. Further, the
register 18 is determined based on the frequency of occurrence of the amplitude fluctuation
section which can be determined to be a musical tone program section. Specifically, if the
number of pulses in the signal S7 in the unit period is within one, it is determined that the Tomei
program unit, and if it is two or more, it is determined that it is an audio program. In the figure,
the tone program section generates O91... 1, 0, and the voice program section generates
4.degree. Now, temporarily, the musical tone program section is input, and the talk proceeds
from a state where the 1111 sub-signal S17 exhibits a high level and the sound field effect is
applied largely. In the musical tone program section, the signal 315.316 is at the high level, and
the control signal 817 is at the high level. In the musical tone program section, the output 311 of
the comparator 15 indicates the low level and the output 312 of the comparator 16 indicates the
high level because the frequency of occurrence of the amplitude fluctuation section is low. When
the tone program section changes to an audio program section and four pulses in the signal S7
are counted, the output 311 of the comparator 15 changes to high level and the output 812 of
the comparator 16 changes to low level. Here, since the pulse of the signal 811 enters the latch
circuit as the signal 815 through the not gate 25 and enters the latch circuit, the input of the flip
flop 22 is the signal 816 as it is when the tone program is changed to the audio program portion.
Change to low level. Therefore, it is determined that the audio program unit has input, and the
control signal 817 changes from high level to low level, and switches so that the sound field
effect is reduced. Next, the switching operation from the voice program unit to the musical tone
program unit will be described. The signal 812 is at low level during the audio program section.
Since AND gate 23 derives the AND output of signal 812 and signal S8, the pulse in signal S8
passes through 1 ° during a period determined by comparator 15.16 as a musical tone program
section, so the output of AND gate 23 The signal 313 supplies the pulse P1 in the signal 813
generated in the period of the unit period to the counter 19 in the easy & programmed section
determination period based on the signal 812. Here, the counter 19 is brought into a loading
state by the signal 815 and the AND output -C signal qs1n of the signal 816, so the counter 19
counts the pulse P1 in a period determined to be a musical tone program section, and this count
value When the value of R exceeds the value of the register 20, a predetermined carry signal is
output to make the signal 316 full level.
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As described above, since the signal 316 delays the next switching to the low level, the operation
of the flip flop 22 does not change even if the signal 815 is determined to be the musical tone
program section by the comparator 15 and the signal 815 indicates the high level. S17 remains
low level. On the other hand, when the signal 316 goes low, the signal S15 is high, so the flip-flop
22 inverts and switches the control signal 817 to high level. As a result, the sound field effect can
be applied strongly again. That is, when the voice program unit is finished and the tone program
unit is turned on again, it is not switched to the sound field effect of the tone program unit. After
the unit period to be determined is detected a plurality of times (here, 2I1 order period), the
control signal 817 is set to the high level. Thus, in this embodiment, immediately after switching
from the tone program unit to the voice program, the sound field effect is switched from strong
to weak and when the voice program is switched to the tone program unit, the sound field effect
is performed after a predetermined time has elapsed. Can be switched to automatically select the
field effect suited to each program. In the above embodiment, after it is determined that the
program is a speech program unit, the number of amplitude fluctuation units determined to be a
program to be identified as a Tonmei program unit is small, although it is determined to be a
tone program and the sound field effect is 1 The system is switched from the voice program unit
to the control of the tone program unit by being counted over the unit period of time. Such an
idea implies that the reverse operation is also possible. That is, the above-mentioned buffer
period is set () until it is determined that it is a tone program section and it is determined that it
is a voice program section. In the above embodiment, the functions of the comparators 15 and
16 may be replaced, that is, the signal S11 may be supplied to the AND gate 23 and the signal
j3s12 may be supplied directly to the latch circuit 21. FIG. 6 shows a method of reliably
performing the operation of the comparator 5 in the syllable detection circuit 2. In FIG. 6, the
input signal ei directly enters the comparator 5 'and also enters the comparator 5' via the
envelope detection circuit 31 degree coefficient circuit 32. Such a configuration is convenient
when the sound field is varied. FIG. 7 shows the operation of the circuit of FIG. 6. The input
signal ei is detected as an envelope signal E + of a normalized level by an envelope detection
circuit 31 such as average value detection and peak value detection.
Thereafter, by multiplying the coefficient α by the coefficient circuit 32, level comparison is
performed with αEi as a reference voltage. Thus, even when the input signal ei fluctuates, αEi
follows it, and the amplitude fluctuation part can be detected reliably. In FIG. 7, (A> shows the
operation waveform of the envelope detection circuit 31 and (B) corresponds to the signal S1 in
FIG. In addition, as a method of control of the sound field effect, only the method by the switch
circuit 4 can be used, and it is possible to switch the post effect by electronic volume etc. e, fade
in by VCA (li pressure control umbrella) It can also fade out. As described above, according to the
present invention, it is possible to automatically select and apply different sound field effects to
the audio program signal in the tone program section and the voice program section.
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[0002]
Brief description of the drawings
[0003]
FIG. 1 is a block diagram showing a basic configuration of a sound field effect automatic control
v device according to an embodiment of the present invention, FIG. 2 is a circuit diagram
showing an example of a concrete circuit of a syllable detection circuit, and FIG. 4 and 5 are
timing charts for explaining the present invention in detail, and FIGS. 6 and 7 are explanatory
diagrams for explaining a method for reliably performing syllable detection according to the
present invention. is there.
DESCRIPTION OF SYMBOLS 1 ... sound field effect circuit, 2 ... syllable detection circuit, 3 ... logic
circuit, 4 ... switch circuit, 5 ...] comparators 6 and 9 ... monostable multi-bibreak, 7, 8 ... Nantes
gate, 10 ... Clock generator, 11 ... Falling detection circuit, 12 ... Timing signal generation circuit,
13 ... (First) counter, 14 ... Fritsbuff [ ], 15 ... (first) comparator, 16 ... (second) comparator, 17.18
... register, 1 o ... (second) counter, 20 ... register, 21: latch circuit, 22: flip flop, S6: binary signal,
811: first determination signal, 812: second determination signal, S16: third determination Signal
817: control signal. Susumu Itoh (伊 tJ-2; Figure 6)
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