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A. Industrial Application Field The present invention relates to a signal compensation circuit
which branches a signal path into a plurality of paths at a branch portion, assigns the branched
signals to different frequency bands, and combines them again. SUMMARY OF THE INVENTION
B0 The invention is a sound quality compensation circuit for controlling frequency-delay time
characteristics in order to improve sound quality improvement and effects, in which an acoustic
signal is first passed through a common delay line having a plurality of intermediate taps, sound
quality compensation effect A device that connects narrow band filters to the appropriate taps
and adds them together as an output signal. C0 Prior Art Conventionally, in an audio signal
processing circuit (for example, the equalizer of a player, etc.), as shown in FIG. 5, the signal
coming in through the terminal 1 is first branched into a plurality of narrow bands. The
amplitude of its output is controlled by the gain control stage 3 for each channel through the The
splitter 2 is composed of n channels divided into equal bands at a logarithmic frequency (log f),
and a narrow band signal passing through this is given predetermined frequency-gain
characteristics by each gain controller 3, The signal is synthesized again by the synthesizing
circuit 4 and output from the terminal 5 to adjust the frequency-amplitude characteristic of the
signal system, and it is adapted to the reproduction system (speaker), the sound source (record
etc.) and the aural preference. This method has the disadvantage that the frequency-phase
characteristic of the acoustic signal is not taken into consideration. Of course, in general, except
for the phase difference between binaural signals in stereo signals, phase characteristics are not
a problem in acoustic signals, and this has been equally applied to frequency-phase
characteristics in sound quality compensation circuits. It will be a big cause. The inventor of the
present invention has applied the patent application (Japanese Patent Application No. 60144966) entitled "Sound Quality Compensation Circuit for Narrow-band Transmission System"
filed on July 1, 1984, to the frequency of the human auditory system. -Discussed delay time
characteristics. FIG. 6 shows an example thereof. FIG. 6 (a) is an example of experiment of cat's
auditory demand (de Boar: "5 synthetic whole-nerve action potentials" J). ???????
?????????????? NO, 5, (pp, 1034) Nov, 1975) and FIG. 6 (b) are examples
measured by the present inventor and all show that the delay is smaller at high frequencies as
compared to low frequencies. As is apparent from this figure, the delay time of @ sense is largely
different at low and high frequencies, so it is estimated that the phase characteristic hardly
causes a problem in monaural sound (monaural). D1 Problems to be Solved by the Invention In
the system of the above-mentioned Japanese Patent Application, as shown in FIG. 7, a delay line
(system) is required for each channel of the duplexer, which is not only inferior in economic
efficiency but also structure It also becomes complicated.
In FIG. 7, 6 indicates a variable delay system. The object of the present invention is to control the
delay time as well as the gain of each splitter of FIG. To provide. Means for Solving the E0
Problem To achieve the above object, a sound quality compensation circuit of the type mentioned
at the beginning according to the invention is additionally provided at the input side of the
branch and the branched signal is extracted The gist is to include a delay means having a
plurality of intermediate taps. In an advantageous embodiment of the invention, the delay means
is a distributed capacitance delay line or a bucket brigade device. Even if there is only one F3
action delay means, it has a plurality of middle taps, and the signal of each channel extracted
therefrom has a predetermined delay time, and the inverse characteristic of the characteristic
shown in FIG. If delay equalization is performed, the sound in each frequency band is perceived
at the same time in terms of hearing and can have exactly the same effect as that of the abovementioned Japanese Patent Application. G. Examples The invention will now be described in
more detail by way of examples with reference to the drawings, which are by way of example
only, and various modifications and improvements can be made without going beyond the scope
of the invention. Of course it is possible. FIG. 1 is a block diagram showing the configuration of a
sound quality compensation circuit according to an embodiment of the present invention. As
shown, according to the invention, the input signal is first applied to the broadband delay line 7.
The delay line 7 is provided with a large number of intermediate taps with small intervals of
delay time, and one output line is taken out from an arbitrary tap to use one delay line as a
variable delay line. The tap output of the delay line 7 is added to the splitter 2, and the output is
level-controlled by the gain controller 3 and added by the combining circuit 4 to be an output.
The configuration is simplified because only one variable delay line is required compared to the
device shown in FIG. FIG. 2 shows a defeet circuit, and in the case where the characteristic of 5
frequency-delay time is kept flat, the input signal is divided without passing the delay line by
turning the switch 8 to the defeet side (broken line in the figure). In addition to the wave device
2, it becomes the conventional system of only frequency-gain control shown in FIG. The tapped
delay line of FIG. 1 makes it possible in principle to achieve the object of the invention. However,
when the delay time is on the order of ms, the delay line consisting of L (inductance) and C
(capacitance) is too large to be practical. An analog signal delay line is referred to as a socket-
bridge device (hereinafter abbreviated as BBD in the present specification).
????? FIG. 3 shows the configuration. The input signal at the left end input terminal IN is
transferred next to the small-capacity capacitor and reaches the right end output terminal 0 [JT1,
0UT2. If a clock signal is added to CPI and CF2 to fix the clock frequency, it becomes a fixed
length delay line, and if the clock frequency is changed, it becomes a variable length delay line. In
order to use it as a tap type delay line, a bumper amplifier for output extraction may be provided
in the middle of the BBD as shown in FIG. In this case, the clock frequency is fixed in principle.
Furthermore, in the case of the configuration in which the digital signal is processed, the delay
line 7 in FIG. 1 may be, for example, a shift register, and the digital signal may be taken out from
a position to be fixed to a tap. In the case of a BBD tapped structure, the delay time of each
narrowband No, 1 to n channels, and thus the position of the taps are determined, and then the
clock frequency for transfer to operate the BBD is changed to change the overall delay. The time
changes in proportion, for example, if the clock frequency is increased, the delay difference
between channels is reduced, and the compensation effect can be increased by / h. When applied
to a stereo signal, the configuration of FIG. 1 is applied to a right ear signal and a left ear signal.
At this time, when the high-frequency delay time is increased, the rising of the sound perceived
by one ear becomes sharp, and the localization of the sound image becomes sharp. Conversely,
when the low frequency delay time is increased, the rise of the sound perceived by one ear
becomes dull, and the localization of the sound image mainly relies on the phase difference in the
low frequency component, and the relatively fused sound field You can get As described in detail
in the H8 invention, according to the present invention, using one tapped delay line instead of
the number n or n-1 variable delay lines corresponding to the narrow band filter group is
equivalent to the former. It is possible to obtain compensation of various frequency-delay time
characteristics. Furthermore, when the BBD tapped delay line is used, the compensation effect
can be adjusted by controlling the clock frequency. In addition, it applied to the stereo signal to
control the sharpness of the sound image, that is, the delay time of the high frequency
component was increased to obtain a clear sound image localization, and the delay time of the
low frequency was increased to expand the sound image. You can get the status.
Brief description of the drawings
FIG. 1 is a block diagram showing the configuration of a sound quality compensation circuit
according to an embodiment of the present invention, FIG. 2 is a circuit diagram of a defeat
circuit of the circuit shown in FIG. 1, FIG. 3 shows an example of B B A Fig. 4 and Fig. 4 are
circuit diagrams of the 880 circuit used in the sound quality compensation circuit according to
the present invention, Fig. 5 shows an example of a conventional equalization circuit, and Fig. 6
shows an example of auditory frequency-delay time characteristics. FIG. 7 shows an example of
the equalization circuit previously proposed.
и и и и и и и и и и и и Output terminal, 7 и и и и и и и и и и delay line with a tap. Miso / 7 honor north turning
distance Q-I 1j Fig. 5 @ Ic K! 7 7 Rn # A L 8 ? 7 ? ?, ? (a) ? = ? ? ? ? 1 ? B ?1 +1 +1 +1
+1 +1 +1 6 +1
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