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JPS508922

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DESCRIPTION JPS508922
■ Level indication device ■ Japanese Patent Application No. 45-102261 [Phase] Application No.
45 (1970) November 19 @ inventor Nakamura Tadashi-Tokyo 20 Tokyo's 20 five-same Kimano
Konosuke Adachi-ku Adachi-ku Nakamago Tokyo Ota-ku 3 of 4 70 Applicants Sony Corporation
Tokyo Parts for the District Kita Goods 6 of 7 35 [Present] Attorney Attorney Minoru Ito
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a connection diagram of an embodiment of a
level indication device according to the present invention, FIG. 2 is a schematic structural view
for explaining a display unit of an embodiment of the present invention, FIG. FIG. 7 is a waveform
diagram for explaining an embodiment of the present invention.
Detailed Description of the Invention The present invention combines, for example, a tape
recorder and a television receiver, displays the reproduction signal level of the tape recorder on
the video surface of the television receiver, and knows the optimum recording level of the tape
recorder. In particular, it is intended to provide a level indication device suitable for use in the
present invention, which can display the levels of a plurality of audio signals at the same time
and has a higher operating speed than a mechanical indication device such as four meters. An
embodiment of the present invention will now be described with reference to FIG. In FIG. 1,
reference numeral 1 denotes a terminal to which a horizontal output signal is supplied from a
television receiver. The terminal 1 is connected to an integrating circuit 4 composed of a resistor
2 and a capacitor 3, and the output terminal of the integrating circuit 4 is grounded via the
variable resistor 5. The mover of this variable resistor 5 is connected to the base of the transistor
6a. The emitters of the transistor 6a and the transistor 6b are connected to each other, and the
Schmitt circuit 6 is configured. Further, 7 is a [111111] power supply terminal to which a DC
voltage of, for example, +12 V is supplied. An output terminal of the Schmitt circuit 6 is
connected to a base of a transistor 80 for phase inversion, and a collector of the transistor 8 is
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derived through a capacitor to form an output terminal 9. The output terminal 9 is connected to
the base of the video output transistor of the television receiver. Further, a terminal 1 to which a
horizontal output signal is supplied is connected to an integrating circuit 12 composed of a
resistor 10 and a capacitor 11, and an output terminal of the integrating circuit 12 is grounded
via a variable resistor 13, this variable resistor 13 The movable element is connected to the
Schmitt circuit 140 input terminal, and the output terminal of the Schmitt circuit 14 is connected
to the differentiating circuit 15. The output terminal of the differentiating circuit 15 is connected
to the input terminal of the Schmitt circuit 16, and the output terminal of the Schmitt circuit 16
is connected to the base of the phase inverting transistor 80. Further, in FIG. 1, reference
numeral 17 denotes a television receiver (a terminal to which a horizontal output signal is
supplied from the collector of the D horizontal output transistor, this terminal 17 is connected to
the integrating circuit 18, and the output of the integrating circuit 18 is The terminal is grounded
via the variable resistor 19. The mover of this variable resistor 19 is connected to the base of the
transistor 6c. The emitter of the transistor 6c is connected to the emitter of the transistor 6b
described above, and a Schmitt circuit 6 'is formed by the transistors 6c and 6b. Further, in FIG.
1, a terminal 20 indicates a terminal to which a vertical output signal is supplied from a
television receiver.
The terminal 20 is connected to the integrating circuit 21 and the output terminal of the
integrating circuit 21 is connected to the transistor 22 and the base of the transistor 230 via
capacitors. The collector of the transistor 22 is grounded via a capacitor and a variable resistor
24, and the emitter is grounded via a capacitor and a variable resistor 25. The mover of this
variable resistor 24 is connected to the base of the transistor 26a, and the mover of the variable
resistor 25 is connected to the base of the transistor 26c, and the emitter [111111] EndPage of
the two transistors 26a and 26c: one and the collector Are connected to each other, the emitter
connection point is connected to the emitter of the transistor 26b, and the collector connection
point is connected to the base of the transistor 26b. The secondary transistor 26a, the transistors
2 and 6b, and the transistors 26c and 26b form a Schmitt circuit 26, respectively. The output
terminal of the Schmitt circuit 26 is connected to the base of a transistor 80 for phase inversion.
Also, the collector of the transistor 23 to which the vertical output signal of the television
receiver described above is supplied is grounded via the variable resistor 27 and to ground via
the variable resistor 28. The mover of the variable resistor 27 is connected to the input terminal
of the Schmitt circuit 29, and the output terminal of the Schmitt circuit 29 is connected to the
output terminal 9 through the transistor 30 for phase inversion and the resistor. The 28 movers
are connected to the Schmitt circuit 310 input terminal, the output terminal of the Schmitt circuit
31 is connected to the differentiating circuit 32, and the output terminal of the differentiating
circuit 32 is connected to the base of the transistor 8 for phase inversion. Further, in FIG. 1, a
terminal 33 indicates a terminal to which a stereo left signal obtained by, for example, a twochannel stereo system is supplied, a terminal 34 indicates a terminal to which a stereo right
signal is supplied, The left signal and the stereo right signal are supplied to, for example, a tape
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recorder and recorded. The terminal 33 is connected to the voltage doubler rectifier circuit 36
via the transistor 35 configured in the emitter follower configuration. Also, the output terminal of
the voltage doubler rectifier circuit 36 is connected in the emitter-follower-type transistor 390,
and the emitter is connected to the collector of the transistor 40 in the emitter-grounded form.
The output terminal of the Schmitt circuit 41 is connected to the base of the transistor 40. The
Schmitt circuit 410 is connected to the integrating circuit 43 through the variable resistor 42,
and the integrating circuit 43 is supplied with a horizontal output signal from the terminal 1
described above.
Therefore, the transistor 40 is turned on / off according to the output of the Schmitt circuit 41,
and the DC component of the stereo left signal is supplied to the Schmitt circuit 290 input
terminal described above via the diode 44 and the variable resistor 45 only when the transistor
40 is off. Ru. On the other hand, the stereo right signal supplied to the terminal 34 is also
subjected to double voltage rectification in the same manner as the stereo left signal as described
above and supplied to the collector of the transistor rlllllll. The transistor 470 base is connected
to the collector of the transistor 49. The base of the transistor 490 is connected to the output
terminal of the Schmitt circuit 4 B to which the horizontal output signal is supplied from the
input terminal 1 via the integrating circuit 43. Therefore, the DC component of the stereo right
signal is supplied to the Schmitt circuit 290 input terminal described above via the diode 50 and
the variable resistor 45 only when the transistor 47 is off. Thus, the DC component of the stereo
left signal and the stereo right signal is alternately supplied to the Schmitt circuit 29 within one
horizontal scan. Further, in the above configuration, switching means is provided in the signal
path to which the horizontal output signal and vertical output signal are supplied from the
television receiver, and the television receiver can be used as needed according to this switching
means. To be used as a level indicator. According to an embodiment of the present invention
having such a configuration, as shown in FIG. 2 (a black frame 52 is formed on the peripheral
portion and the central portion of the image surface 51 of the television receiver; For example,
the reference recording level indication line 54 is drawn at a predetermined position of the
display portions 53L and 53R, and the gray portions move up and down in the display portions
54L and 54R according to the magnitude of the levels of the stereo left signal and stereo right
signal. . The operation of such an embodiment of the present invention will be described with
reference to FIGS. 3 to 7. From the television receiver, the terminal 1 receives the horizontal
output signal shown in FIG. 3A (FIG. 5A). Is supplied, the terminal 17 is supplied with the
horizontal output signal shown in FIG. 4A, and the terminal 20 is supplied with the vertical
output signal shown in FIG. 7A. The horizontal output signal supplied from the terminal 1 is
made to be a signal shown in FIG. 3B by the integrating circuit 4 and is supplied to the Schmitt
circuit 6. At the output terminal of the Schmitt circuit 6, the signal shown in FIG. 3B is sliced at a
level determined by the variable resistor 5, and a pulse signal shown in FIG. 3C is obtained. The
pulse signal is phase-inverted by the transistor 8, and the pulse signal S1 shown in the third
scheme is made equal to the black level and supplied from the terminal 9 to the video output
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circuit of the television receiver.
The right half of the pulse signal S1 shown in the third scheme is as shown in FIG. 6 (as it occurs
within the horizontal flyback period, the left side of the video surface 51 of the television receiver
(viewed toward FIG. 2) The edge of is black. [111111] EndPage: 2 The horizontal output signal
shown in FIG. 4A supplied from the terminal 17 is delayed in phase by the integrating circuit 18
to obtain the signal shown in FIG. 4B, and a variable resistor Sliced at a level determined by 19,
the pulse signal shown in FIG. 4C is obtained at the output of the Schmitt circuit 6 ', this pulse
signal is inverted in phase by the transistor 8, and the pulse signal S2 shown in FIG. 9, the video
output circuit of the television receiver is supplied. The left half of the pulse signal S2 is
generated as shown in FIG. 6 (due to the horizontal blanking period, the right edge of the image
surface 51 of the television receiver becomes black. Also, the horizontal output signal from
terminal 1 is made the signal shown in FIG. 5B by the integrating circuit 12, sliced at a level
determined by the variable resistor 13, and the square wave shown in FIG. 5C at the output
terminal of the Schmitt circuit 14. Is obtained. The square wave is differentiated by the
differentiating circuit 15, the differentiated waveform shown in the fifth aspect is supplied to the
Schmitt circuit 16, and the pulse signal S5 shown in FIG. 5F obtained by inverting the phase of
the pulse signal shown in FIG. Supplied to the video output circuit of the television receiver.
Therefore, a black band is drawn at the center of the image plane 51 of the television receiver. In
this case, the variable resistor 13 is adjusted so that the black band is located at the center of the
image plane 51. Further, the vertical output signal shown in FIG. 7A supplied from the terminal
20 is made into a sawtooth wave shown in FIG. 7B in the integrating circuit 21 and supplied to
the base of the transistor 22. Accordingly, the sawtooth wave shown in FIG. 7B is obtained at the
emitter of the transistor 22 and the signal shown in FIG. 7C having an opposite phase to that of
the collector is obtained. The sawtooth waves are sliced at levels determined by the variable
resistors 24 and 25, respectively, and the pulse signal shown in the seventh scheme from the
Schmitt circuit 26 is supplied to the video output circuit of the television receiver, Black frames
are drawn on the upper and lower edges. Also, the vertical output signal supplied from the
terminal 20 is made into a sawtooth wave as shown in FIG. 7B by the integrating circuit 21, is
inverted in phase by the transistor 23, and is sliced at the center of the sawtooth wave by the
variable resistor 28. It is supplied to the Schmitt circuit 31. The square wave obtained by the
Schmitt circuit 31 is differentiated by the differentiating circuit 32 and supplied to the base of
the transistor 8.
Reference recording level finger rl111 111 water line 54 is drawn at the center of image plane
51 accordingly. Further, the vertical output signal is supplied to the Schmitt circuit 29 through
the variable resistor 27. The output of the Schmitt circuit 29 is led to the output terminal 9
through the transistor 30 and the resistor. Here, if the transistor 8 is on, the direct current level
of the output terminal 9 is black level as described above, and if the transistor 8 is off, the direct
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current level of the output terminal 9 is white level. Even when the transistor 30 is turned on,
however, the DC level of the output terminal 9 falls below the white level and becomes gray level.
Therefore, a gray band is drawn on the lower edge of the image surface 51 of the television
receiver. In this case, the variable resistor 27 is adjusted to change the width of the gray band so
that this gray band can be seen slightly from the black frame at the lower edge of the image
surface 51. Here, DC components of the stereo left signal and the stereo right signal from the
terminals 33 and 34 are alternately supplied to the base of the Schmitt circuit 29 in one
horizontal scan. For this reason, the DC level of the stereo left signal or the stereo right signal is
superimposed on the level at which the slice level of the Schmitt circuit 29 is determined by the
variable resistor 27, and the video is changed according to the change in the level of the 2nd
stereo left signal and the stereo right signal. The gray part moves up and down on the surface 51.
The stereo signal from the 2-channel stereo device can be recorded on the tape recorder while
monitoring this level indication. As apparent from the above, according to the present invention,
it is possible to simultaneously display the levels of a plurality of audio signals such as stereo left
signal and stereo right signal on the image surface of a television receiver. Therefore, it becomes
easy to compare the levels of a plurality of audio signals with one another, for example, it is
possible to immediately know the balance between the left and right of a stereo signal, and if
used to record this stereo signal in a tape recorder It has the benefit of being a dog, such as being
able to record. Further, according to the present invention, the level display is performed with the
time constant of 1/60 seconds or less of the vertical oscillation cycle in the television receiver, so
operation compared to mechanical indication devices such as a meter etc. Speed is fast (and
accurate level indication can be done. Of course, the level indication device according to the
present invention does not lose the function of the ordinary black and white or color television
receiver itself [1111111 EndPage: 3 mag etc., and when the level indication is unnecessary, the
television receiver can It can be used as well as things.
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