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JPS5164309

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DESCRIPTION JPS5164309
Chief of Patent Office (others 1) 3, Patent applicant 49-082296 '鑞 14)-' '-°' [phase] Japan
Patent Office 0 JP 51-64309 日 Published Japan 51 51. (1976 ) E, 3 in-house serial number
(70753624253 specification 1, the name of the invention
Noise removal device
3. Detailed description of the invention In accordance with the invention, the noise reduction
device compresses / decompresses the signal to be transmitted before and after the transmission
system in order to reduce the influence of the noise generated in the 411 transmission system.
The present invention relates to a noise removal device suitable for integration and capable of
combining compression and decompression operations with one circuit device when
compression and decompression circuit devices are incorporated in the same device.
Conventionally, in order to reduce the influence of noise generated in the transmission system,
the signal to be transmitted is compressed with low level changes of the signal according to the
recording rule, and a noise removal device that performs decompression on the reproduction
side is generally one compander "Toshite is well known. And there exists automatic noise
reduction system (ANf'L8) which used such a system for discrete 4-channel record universal
expression. That is, FIG. 1 shows a schematic configuration of the ANR 8 in the discrete 4
channel record system, and the input terminal tl (a difference signal supplied to 1 is via the
variable frequency circuit +11 having high frequency rising characteristics). Thus, the voltage
control variable gain circuit t1 is supplied. In this voltage control variable gain circuit (in 121, a
filter of a predetermined band (high band) EndPage: 1 (! (The signal is controlled by the output%
rc by the level detection circuit 114 that detects the bell of the good signal through, does not
operate when the signal is low level, and the repe is lowered only when the high level and high
frequency region). work. Therefore, when the high frequency region of the low level is obtained
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by the rising characteristics of the high frequency region of the variable frequency circuit ru>
and the falling characteristics of the high frequency region of the voltage control-variable gain
circuit +13, Only the level is above. It produces an annoying or compressed signal. 9) The voltage
control variable gain circuit on the reproduction side also has the same band as that of the
recording signal], and is controlled by the signal output XrJ of the level detection circuit 11B that
detects the level of the signal Ru. That is, the # 1 circuit on the voltage side does not operate
when the signal is at a low level, and works so that the level rises only in the high frequency
region only when the signal is at a high level. Then, the output of this voltage control variable
gain circuit 16) is such that the level is lowered in the high frequency area via K11 <variable
frequency circuit OIJ so that the level is lowered only in the high frequency area at the low level
To obtain an output signal (2) having a level change. As described above, the recording side
compresses the level change of the low level signal in the high frequency region, and in the
reproduction mode, it obtains VcIIlIJ <so that the compressed level change is expanded, so that
linear characteristics are obtained through the recording and reproduction. Can.
However, since the circuit configuration of the ANR 8 configured as described above is
individually configured as individual circuit components, the mechanism is relatively
complicated, which causes a cost increase. That is, in these circuits, a filter, a detector, an
electrical I-gain circuit, a variable frequency characteristic circuit, etc. are included. In addition,
when using semiconductor diodes, bipolar transistors, field effect transistors, etc. as Lohe
variable resistance elements to obtain low gain variable circuits and variable frequency
characteristic circuits, when performing strict control to determine the operating point etc. Is
essential. Alternatively, such a variable resistance element has poor temperature stability, so
compensation must be performed in some way. Moreover, this town change resistance M, the
element is not so good in linearity, and has disadvantages such as a relatively narrow dynamic
range. Then, circuit integration may be considered to solve the above-mentioned factors.
However, the field effect transistor used as the variable resistance element described above is
difficult to integrate, and it is necessary to use a special process. Furthermore, in the case where
field effect transistors and the like are integrated on +1 'lines, it is difficult to obtain desired
characteristics, and there is a disadvantage that Q adjustment must be made because the
variation is large. The present invention has been made in view of the above-described problems,
and it is an integration that is rationally configured with a minimum number of external
connection terminals and external parts without using an OF variable resistance element such as
a field effect transistor. Fc1Ik is also suitable to provide a suitable noise canceller. This will be
described in detail with reference to the following five drawings. FIG. 2 is a block diagram of a
noise removal apparatus according to the present invention. That is, the human power signal is
supplied to the amplifier (2) having the inverted fist non-inverted output terminal that converts
the voltage change of the input signal into the current change through I7 through the first input
premoisture. This amplifier is a differential amplifier (a common-emitter amplifier if a differential
output is not required) and is supplied to the second adder to this inverted output and to the
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adder of the non-inverted output HIIEI. Ru. 17t, this tweet at has another input terminal 61), and
this manual power via an F9r-fixed filter C32 for dividing and processing the compression /
expansion operation into several bands as necessary. It is supplied to 1 child 6 beds Such a filter
is necessary at least one or more, and includes a band pass filter or a high pass filter.
The signal from the input terminal C1.eta. Is supplied to a voltage controlled variable gain circuit
(d) which converts a human power change into a current change, including a differential
amplifier having an inverted / non-inverted output, and the non-inverted output is the first To the
adder, the inverted output-is supplied to the second adder 1. The output of the above-described
second adder is connected to the output terminal-, and the output of the first adder () to the
output terminal @. The voltage control OT variation gain (b) gain 4 is controlled by the output vci
of a detector (d) that receives an EndPage: 2 signal from the input terminal 6D and detects the
width level of the signal. . That is, control is performed so as to reduce the gain when the signal
level of the signal passed through the predetermined filter is small, and to increase the gain as
the signal level becomes thicker rx. When the filter t32 is a high-pass filter and, for example, a
separate band pass filter is provided, a differential amplifier is similarly included from the input
terminal of the filter 介 through the band pass filter '37 J and the output of the detector The noninverted output r! Is supplied to the voltage controlled variable gain circuit 1 which controls the
gain by Xr, and to the second adder j at the inverted output of this voltage controlled variable
gain circuit. It is supplied to the first adder. This voltage controlled variable gain circuit a)
includes a differential amplifier as described in “i. 1− described above, and controls the gain by
controlling the current source connected to this circuit or the current division λ 2 circuit. There
is. Also, separately input one thousand C! To these circuit configurations. A variable frequency
circuit (d) that obtains a signal to which high frequency rise characteristics are given by
supplying a signal to υ at the output terminal 1 and a high frequency fall characteristic by
giving signals to an input terminal O A variable frequency circuit and an example are provided to
obtain an output terminal 1m. By arbitrarily switching the variable frequency circuit of the noise
eliminator configured as described above, or by connecting a manual signal of the cabinet 1261
to the input terminal 141m of the filter (or) or an example of a 1 tl power terminal, This circuit
configuration can be used as either a compression or decompression operation. That is, for
example, when used as a compression circuit device, the rt town variable frequency circuit (the
output terminal 1 of 241 is connected to the input terminal of the amplifier [with], and the
output terminal @ is connected to the input terminal +1 of the filter) Further, by supplying the
human power signal to be compressed to the variable-wave number ro] g + input terminal 121+
of the example, a signal in which the level change of the low level signal in the high band of the
output terminal (ch) human power signal is compressed is obtained.
In addition, when used as an expansion circuit device, the input signal is supplied to the input
terminal-of the amplifier (d), and the input terminal-of the input terminal filter G2 is connected to
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connect the output terminal C4. A signal obtained by compressing the level change of the low
level signal in the high band and restoring the original signal is obtained as a signal in which the
level change in the high band is expanded and controlled. FIG. 3 is a connection configuration
diagram when the circuit configuration shown in FIG. 2 is used as a compression / expansion
circuit device by the above connection, and in this case, a band pass filter is omitted E7 and only
a high pass filter is used. The case will be described. That is, when used as a compression circuit
device, the human power signal is supplied to the variable frequency circuit @ having a high
frequency frequency rising characteristic, and the output terminal (2) is connected to the input
terminal 4I of the filter. Accordingly, it has J-band frequency rising characteristics. If the signal
supplied to the second adder G4 from the inverted output of the amplification 4 via the J variable
frequency circuit 冴 is, for example, positive in polarity, the inverted output of the voltage
controlled variable gain circuit (至) is transmitted from the second addition The signals supplied
to the appliance 1 are summed with negative polarity to obtain at the output terminal (b) a
compressed signal of the level change of the low level signal at the high frequency of the human
power signal. In addition, when used as an expansion circuit device, the human power signal has
a high frequency frequency drop characteristic. The output of this circuit is supplied to the input
terminal +/− when the J variable frequency circuit 128) is supplied. Accordingly, the human
power of the circuit layer having the delocalization wave number drop characteristic is reduced
by the if variable gain control circuit (33% ift!) Through the filter. After being filled, the amplifier,
along with the non-inverted output of the pole, are registered in the first addition 4 fields, and
the input signal is controlled to be extended at the output terminal. Gain power. By performing
recording / reproduction using the above-described Wang's work expansion cycle @ 裟 injection,
perfect reproduction of human power is possible, and the # sound level generated in green leaf
media can be reduced. . Next, it will be described in detail that expansion / compression of level
change is performed by the circuit configuration shown in FIG. FIG. 4 illustrates the variable gain
control according to the present invention as shown in FIG. 1 for illustrating that the variable
gain control portion functions as a voltage control variable gain circuit 11 (in FIG. 4). Only part
was shown out! である。 EndPage: When the level change of the power of the wax with the gain
α at 3 changes, that is, the level of the large force signal is changed, α =-0, 1 + 7) 4Cr x B =
0.099A, α = Q, 9 (il In the case where B == o, 52A, it works so that the output level drops as the
signal level increases in the high region.
When the gain becomes larger than the gain α ri1, the oscillation state is established, and
therefore, it is used in a state not larger than one. Further, in FIG. 3bl, the output -CtiC = 8 (1 +
α) for the input B is obtained. Here, the gain α changes with the input B. That is, in the case of
α = 0.1, Kr1c = o, l, in the case of α = 0.9 [rtC = 1, 8], and the output level increases with the
increase of gl @ at the high frequency. To work. As described above, in the case of the 46th
through the variable frequency circuit having the high frequency rising characteristic in the
recording f @, the vCri town change gain control circuit does not operate when the signal level is
small in the high frequency, and the signal level becomes large. The level drops with the signal,
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and the signal through the tiJ variable frequency circuit with high frequency frequency drop
property in the reproduction signal does not operate the variable gain control circuit when the
signal level is small at the high frequency and the signal 'Works to increase the level as the pell
grows. That is, it is possible to perform the same control as that of the voltage-controlled variable
gain circuit +1 in FIG. 1 (1e. In this way, in the circuit configuration shown in FIG. 2, by making
the town transient wave-number circuit (d) and the ring 32 having high frequency rise or d fall
characteristics as an external part, a broken line The circuit component part 141 shown can be
integrated, and an integrated circuit of the circuit configuration having four input / output
terminals 15 (31 (34) C (51) can be obtained. FIG. 5 is another connection configuration example
using the integrated circuit shown by a broken line in FIG. 2, in which a circuit for obtaining
high-frequency rising or falling characteristics is connected so as to be present in a loop. In the
case of a compression circuit device, a human power signal is supplied to the input terminal of
the amplifier (d), the output terminal of the first addition 6 (a variable frequency circuit @ is
connected to 、, In the case of the expansion circuit device, the human power signal of the
variable frequency circuit (2) and the human power of the filter C3a are connected If the output
terminal surface is connected to the input terminal of the amplifier (1), the operation is similar to
that of the circuit configuration of FIG. In the configuration example shown in FIGS. 3 and 5,
although compression / decompression is performed only for the tll filter bands, compression /
decompression is performed over each band using a plurality of filters as described above. It can
also be done. By integrating the circuit components except O, the filter and the variable
frequency circuit by configuring the circuit in this way, the connection between the input and
output terminals is merely switched, and the circuit can be used for both compression and
expansion. Integrated circuit can be obtained.
Therefore, the integrated circuit device according to the present invention can be used, for
example, in the case where the integrated circuit of this circuit configuration includes the
recording and reproducing circuits in the same unit and in the unit and does not have to be
operated simultaneously. Can be used for O compression / expansion, and a rational circuit
configuration can be obtained. At the two output terminals CA (C) of this circuit, a positive
polarity signal of manual power can be output to the output terminal-and a negative polarity
signal of the input is output to the output terminal C 匈. be able to. That is, when, for example, a
difference signal (R-L) is supplied to the intermediate terminal of the switching means, a signal of
positive polarity of (R-L) is output to the output terminal-. A signal of negative polarity R-L) can
be obtained. Also, in the discrete 4 channel record system, the difference signal (for example, left
front-left rear) is supplied as human power, and the sum signal (left front + left rear) is
transmitted to the other channels. It must be converted to a signal. In this case, the sum signal
and the difference signal are added to obtain the previous signal, and the sum signal and the
polarity-inverted difference signal are added to obtain the front and rear signals. As described
above, in the case of obtaining the signal after the front fist at 1 m of reproduction, the positive
polarity signal of the difference signal and the negative polarity signal EndPage: 4 are required.
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Therefore, by using the integrated circuit device according to the present invention in the
discrete 4-channel record system, it is possible to easily obtain a signal of the positive / negative
polarity of the difference signal from the output end -T- (2). The matrix circuit for forming the
post-mortem signal on the side becomes extremely simple. FIG. 6 shows a specific example of the
apparatus according to the present invention. In this circuit device, it is a circuit configuration
that performs compression / decompression only for one band of r11, and is a circuit device
integrated without a filter or a variable frequency circuit. That is, the input signal is completely
supplied to the input terminal 61, and the transistor Q1. The differential amplification amplifier
is constituted by Qz and has a function of voltage-current conversion. Further, the input terminalis a second input terminal, and is connected to the detector 4 which is constituted by the
terminals 11m) transistors Qta to Qts. The signal rtv81 supplied to the input terminal 6υ is
amplified by the ratio of the resistors all and R12 around the potential of the signal rtv81 to
obtain a detected output at the emitter of the transistor Q13. In order to detect a small signal
faithfully to this sequence @ configuration, such a platform 1-function is possessed.
This transverse wave output is supplied to a direct current amplifier (@) configured by the
transistor Qll9Qtz * Dlvl. The output from this DC amplifier (63) is supplied to a type soil control
CIT variable gain circuit composed of transistors Q3 to Q1o. In this voltage side n'a variable gain
circuit, the i output of the transistor Qo = Qto, which is a differential pair for current division
connected with Tota at its pole, is the output of the injector. Controlled by the control voltage
X.sub.rc, which is added to the output currents of the transistors Qa, Qss, and continuously
changing the gain from zero to a finite value determined by the resistor R + 21. Bias 11 E
pressure “B 19 ¥ Bza ′ xl 1 K pressure cuff JDL ′) b (S ′ CC), ¥ B 1 X ′ st an 0). The output
terminal is connected so that the non-inverted output of the differential amplifier 回路 and the
non-inverted output of the voltage controlled variable gain circuit are added together. The output
terminal cs41 is connected such that the inverted output of the differential amplifier 4 'and the
inverted output of the voltage control variable gain circuit are added and combined. As described
above, according to the present invention, an amplifier having an inverted / non-inverted output
terminal for converting a voltage change of a signal into a change of current, and a first addition
means to which the inverted output of the amplifier is supplied The first summing means output
or the human power of an amplifier is supplied through a predetermined band-pass filter to
convert a human power signal change into a current change and its inverted output is used in an
Ilki X1 blade calculation means. Voltage side 4i1oT variable gain means having an inverted /
non-inverted output terminal to be supplied, a detector to which an input of the voltage
controlled variable gain means is supplied and the gain is controlled by this output signal, and
the voltage division variable It is possible to obtain a noise removal device comprising a noninverted output of the gain means and a second 7 JO calculating means supplied / delivered to
the non-inverted side of the amplifier, so that the circuit with minimal external connection
terminals and external components The It can be physically integrated. In addition, it is possible
to use a variable resistance element such as a semiconductor diode or F] 13T as a voltage control
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variable gain circuit, and it is possible to configure with high accuracy because the operating
point is not adjusted, and linearity is good. / N can be taken large. When 7 is used in the discrete
4 channel system, the difference signal is supplied to the input] 7 When it is possible to obtain
the IE · negative signal of the difference 1 'f from the output terminal C34) field, In addition to
simplifying the matrix in the case of conversion to the front and back igniters, it is necessary to
integrate recording and reproduction into the same device and to operate compression /
decompression simultaneously at one circuit configuration in one circuit configuration. Have the
effect of being able to double as
4. Brief description of the drawings. FIG. 1 is a schematic block diagram of a conventional noise
eliminator, FIG. 2 is a circuit diagram showing a basic configuration of the present invention, and
FIG. 3 is a connection of the noise eliminator according to the present invention. Fig.4, Fig. 4 fa)
A circuit diagram for explaining the voltage controlled variable gain circuit according to the
present invention, and Fig. 5 is another connection block diagram of the noise eliminator
according to the present invention, Fig. These are the figures which showed the specific circuit
Example of the circuit structure of this invention. 25.31 Input terminal 26 Amplifier 29 First
adder 30 Second adder 33 Voltage controllable End Page: 5 variable gain circuit 34. 35 · · ·
output terminal, 36 · · · · · · detector power / closing Δ figure (l, n (b) EndPage: 6 L ~ attached
document "1 record (1) commission letter 1 1 '(2) specification 1 (3) Drawing 1-(4) Request
Subsidiary 1 Energization \ Inventors other than the above, patent applicants or agents EndPage:
7
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