JPS5819883Y2 - television receiver - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a television receiver in which a television image and a waveform related to other signals such as an audio signal can be viewed on a cathode ray tube. When displaying related waveforms, this waveform is made easier to see.

An example of a television receiver according to the present invention in which television images and waveforms related to audio signals can be viewed on a cathode ray tube will be described below with reference to the drawings.

In Fig. 1, 1 indicates an antenna, and this antenna 1
The television broadcast signal obtained in the above is supplied to the tuner device 2, and the output signal of the tuner device 2 is supplied to the input side of the video detection circuit 4 via the video intermediate frequency amplifier 3. The output signal is supplied to the movable contact 5a of the switch 5, and the output signal of the video detection circuit 4 is supplied to the input side of the synchronization signal separation circuit 6.

The first fixed contact 5b and the second fixed contact 5c of this switch 5 are connected to each other, this connection point is connected to the input side of the video amplification circuit 70, and the third fixed contact 5d of this switch 5 is connected to each other. Ground.

The output signal of this video amplification circuit γ is supplied to the cathode of the cathode ray tube 8.

Further, the brightness control terminal of this image amplifying circuit 7 is connected to the first and second fixed contacts 9b and 9c of the brightness switching device 9 via a variable resistor 10a for brightness adjustment, respectively, and the variable resistor 10a and The connection point between fixed contacts 9b and 9c is connected to a third fixed contact 9d via a resistor 10b for changing the brightness adjustment standard, and the movable contact 9a of this brightness switch 9 is grounded.

This brightness switch 9 is used to adjust the brightness of the cathode ray tube 8 to make it easier to see the waveform of the audio signal.

Further, the horizontal synchronizing signal obtained at one output terminal of the synchronizing signal separation circuit 6 is supplied to one input terminal of the horizontal automatic frequency control circuit 11, and the control signal obtained at the output side of the horizontal automatic frequency control circuit 11 is applied to the horizontal The output signal is supplied to the oscillation frequency control terminal of the oscillator 12, the output signal obtained at the output terminal of the horizontal oscillator 12 is supplied to the horizontal deflection output circuit 13, and the horizontal deflection signal obtained at the output side of the horizontal deflection output circuit 13 is supplied to the cathode ray. A horizontal pulse signal is supplied to the deflection coil 8a of the tube 8, and the horizontal pulse signal obtained from the horizontal deflection output circuit 13 is connected to the connection switch 4.
6 are respectively supplied to the other input terminal of the horizontal automatic frequency control circuit 11.

As is well known, this horizontal automatic frequency control circuit 11 compares the horizontal synchronizing signal obtained at the output side of the synchronizing signal separation circuit 6 with the horizontal pulse signal obtained at the horizontal deflection output circuit 13, and responds to the error signal. The oscillation frequency of the horizontal oscillator 12 is controlled by this control signal.

Further, the vertical synchronizing signal obtained at the other output terminal of the synchronizing signal separation circuit 6 is supplied to the vertical oscillator 14 as a synchronizing signal, and the output signal of this vertical oscillator 14 is supplied to the vertical deflection output circuit 15. The vertical deflection signal obtained at the output side of 15 is supplied to the deflection coil 8a of the cathode ray tube 8.

Further, the output signal of the tuner device 2 is supplied to one input terminal of an audio signal mixing circuit 16 for obtaining an audio signal, and the output signal of the audio signal local oscillator 17 is supplied to the other input terminal of this audio signal mixing circuit 16. the output signal of this mixing circuit 16 to the input side of the audio detection circuit 18;
The output signal of this audio detection circuit 18 is
9 to an audio signal output terminal 20 which supplies the audio signal to a speaker.

In this case, when the movable contact 21a of the changeover switch 21 is connected to one of the fixed contacts 21b, when the output signal of this audio detection circuit 18 disappears for a predetermined time, and when the output signal of this audio detection circuit 18 is below a predetermined level, This muting circuit 19 is designed to operate and mute this output signal when a predetermined period of time has elapsed.

Also, when the movable contact 21a of this changeover switch 21 is connected to the other fixed contact 21c, this muting circuit 19
is designed so that it does not perform muting operations.

Further, 22L and 22R indicate recording signal input terminals for left and right channels, respectively, and secondary recording signal input terminals 22L and 2
The left and right channel recording signals supplied to 2R are output to left and right channel recording signal output terminals 23L and 23, respectively.
R, and the left and right channel recording signals are supplied to one fixed contact 2 of each of the switching devices 24 and 25, respectively.
4b and 25b respectively, and 26L and 26R indicate left and right channel signal input terminals to which left and right channel signals of a stereo signal from, for example, a tape recorder are supplied, respectively, and 26L and 26R are respectively supplied with secondary input terminals 26L and 26R. The supplied left and right channel signals are supplied to the left and right channel signal output terminals 27L and 27R, respectively, which supply signals to the speakers, and the left and right channel signals are supplied to the other fixed contacts 24c of the switches 24 and 25, respectively. and 25c, respectively.

In this case, each movable contact 24 of this switch 24 and 25
a and 25a are linked.

That is, when the movable contact 24a is connected to one fixed contact 24b, the movable contact 25a is connected to one fixed contact 25b, and when the movable contact 24a is connected to the other fixed contact 24C, the movable contact 25a is connected to the other fixed contact 24C. Other fixed contact 2
Make it so that it is connected to 5c.

The movable contact 24ak of this switch 24 is connected to the input terminal of a signal forming circuit 45L via a resistor 28L having a relatively high resistance value, and the output signal is connected to the control terminal of this signal forming circuit 45L every vertical period. Changing flip-flop circuit 4
Connect the output terminal of 7.

A vertical pulse signal obtained from the vertical deflection output circuit 15 is supplied to a trigger pulse supply terminal 47a of this flip-flop circuit 47.

This signal forming circuit 45L is configured as shown in FIG. 3, for example.

That is, in FIG. 3, 45a indicates an input terminal, and this input terminal 45a is connected to the base of an npn transistor 45c constituting an emitter follower amplifier through a capacitor 45b, and the base bias voltage of this transistor 45c is It is connected to a power supply terminal 45e to which a positive DC voltage is supplied through a resistor 45d for determining the base bias voltage, and is grounded through a variable resistor 45f for determining the base bias voltage, and the collector of this transistor 45c is connected to the power supply terminal 45e. and connect the emitter of this transistor 45c to resistor 4
5g to ground and connect this emitter to resistor 45.
The collector of this transistor 45i is connected to the power supply terminal 45e, and the emitter of this transistor 45i is grounded through a resistor 45j. An output terminal 45k is led out from the emitter of the transistor 45i.

The connection point between the resistor 45h and the base of the transistor 45i is connected to the collector of an npn transistor 45t constituting a switching element.
The emitter of t is grounded through a Zener diode 45m that keeps the DC bias of the signal constant, and this emitter is connected to a power supply terminal 45e through a resistor 45n, and this emitter is connected to a transistor 45t through a resistor 450.
A control signal input terminal 45p is derived from the base of this transistor 45t, and the output signal of the flip-flop circuit 47 is supplied to this control signal input terminal 45p.

In the signal forming circuit 45 shown in FIG. 3, an AC signal such as an audio signal as shown in FIG. 4A is supplied to an input terminal 45a, and an AC signal such as a voice signal as shown in FIG. 4B is supplied to a control signal input terminal 45p. When the output signal of the flip-flop circuit 47 is inverted every vertical period V, the signal obtained at the output terminal 45k is as shown in FIG. 4C. During the vertical period when the output signal of the flip-flop circuit 47 is at a low level, the transistor 45t conducts and maintains a constant DC level determined by the Zener diode 45m.
becomes non-conductive, and a human-powered AC signal with a DC bias level of 2 is obtained at the output terminal 45k.

An output terminal 45k of this signal forming circuit 45L is supplied to one input terminal of a mixing circuit 30L via a gain adjuster 29L.

In this mixing circuit 30L, a signal as shown in FIG. 4 which is intended to display the waveform supplied to this one input terminal and a sawtooth wave synchronized with the horizontal pulse obtained at the output side of the horizontal deflection output circuit 13. A sawtooth wave signal generation circuit 31 that generates a signal is superimposed with the sawtooth wave signal 31a.
is a horizontal pulse input terminal to which the horizontal pulse obtained at the output side of the horizontal deflection output circuit 13 is supplied.

The output side of this mixing circuit 3GL is grounded via a variable resistor 32L for adjusting the display position, and this mixing circuit 3QL
The output side of is connected to the input side of a Schmitt trigger circuit 33L constituting a clipper circuit, and the signal obtained at the output side of this Schmitt trigger circuit 33L is connected to a differentiating circuit 34L.
and is supplied to the video amplification circuit 70 input signal via the addition circuit 35.

On the output side of the differentiating circuit 34L, one display pulse signal, for example, which is phase-modulated in the positive direction, is obtained in one horizontal period.

The movable contact 25a of the switch 25 is connected to one fixed contact 36b of the multi-pulse signal display switch 36 via a resistor 28R with a relatively high resistance value, and the direction of the antenna of the FM radio receiver is controlled. The multipath signal input terminal 31 connected to the multipath terminal from which the multipath signal for displaying the multipath signal is obtained is connected to the other fixed contact 36c of this switch 36, and the movable contact 36 of this multipath signal display switch 36 is connected to the other fixed contact 36c of this switch 36.
a to the third fixed contact 38d of the display content switch 38, and the second fixed contact 38c of the display content switch 38.
is connected to the audio signal output terminal 20 so that the audio signal of the television broadcast signal is supplied to the second fixed contact 38c, and the first fixed contact 38 of the display content switch 38 is connected to the audio signal output terminal 20.
Let b be electrically floating.

The movable contact 38a of the display content switch 38 is connected to the input terminal 45a of a signal forming circuit 45R configured similarly to the signal forming circuit 45L, and the output of the flip-flop circuit 47 is connected to the control signal input terminal 45p of the signal forming circuit 45R. A signal is supplied to the output terminal 45k of this signal forming circuit 45R.
is supplied to one input terminal of the mixing circuit 30R via the gain adjuster 29R, and a sawtooth wave signal synchronized with the horizontal pulse from the sawtooth signal generation circuit 31 is supplied to the other input terminal of the mixing circuit 30R. In this mixing circuit 30R, a signal whose waveform is to be displayed and a sawtooth wave signal synchronized with the horizontal pulse are superimposed.

The output side of this mixing circuit 3QR is grounded through a series circuit of a variable resistor 32R for adjusting the display position and a resistor 39 for adjusting the display position.
is connected to the second fixed contact 40c of the display position adjustment switch 40, and the first and third fixed contacts 40b and 40d are electrically floating, respectively.
0 movable contact 40a is grounded.

In addition, the output side of this mixing circuit 30R is connected to the input side of a Schmitt trigger circuit 33R constituting a clipper circuit,
The signal obtained at the output side of the Schmitt trigger circuit 33R is supplied to the input side of the video amplification circuit 7 via a differentiator circuit 34R and an adder circuit 35.

In this case, on the output side of the differentiating circuit 34R, for example, one display pulse signal which is phase-modulated in the positive direction is obtained in the horizontal period, similarly to the output side of the differentiating circuit 34L.

In this case, gain adjuster 29L. A display signal such as an audio signal supplied to the input terminal of 29R is supplied to one input side of mixing circuits 30L and 30R, and mixed with a sawtooth wave signal synchronized with the horizontal pulse from the sawtooth wave generation circuit 31. This is supplied to Schmitt trigger circuits 33L and 33R, whereby the phase of the clipping point changes in proportion to the amplitude of the display signal, that is, phase modulated, and this phase modulated waveform is supplied to differentiating circuits 34L and 34R. This differentiating circuit 34L, 3
One positive-side phase-modulated pulse signal obtained at the output side of the 4R is supplied to the input side of the video amplification circuit 7 via the adder circuit 35 during one horizontal period and displayed on the cathode ray tube 8.

Further, the output side of the differentiating circuit 34L is connected to the second fixed contact 42c of the switch 42 via a diode 41, and the output side of each of the differentiating circuits 34L and 34R is connected to the switch 42 via diodes 43L and 43R. The first fixed contact 42 of
Connect to b - This third fixed contact 42d is connected to a power terminal B to which a positive DC voltage is supplied via a lamp 44 for stereo display, and the movable contact 42a of this switch 42 is grounded.

In this case, the movable contacts 5a, 9a, 38a of the switching devices 5, 9, 38, 40 and 42 = 408 and 42a
so that they are linked to each other.

Since the present invention is constructed as described above, when displaying only a television image on the screen of the cathode ray tube 8, the secondary movable contacts 5a = 9a-38a are replaced with the respective first fixed contacts 5b, 19b, 38b, 40a and 42a. 40b and 42b, respectively.

At this time, the output sides of the differentiating circuits 34I and 34R are grounded via diodes 43L and 43R, respectively, so that the output signals of the differentiating circuits 34L and 34R are not supplied to the video amplification circuit 7.

The output signal of the video detection circuit 4 is supplied to the video amplification circuit 7 via the switch 5, and the switch 9 allows the video amplification circuit T to operate normally.

Also, at this time, the movable contact 42a of the switch 42 is connected to the first fixed contact 42b, so the diodes 43L and 43
All input signals of the adder circuit 35 are grounded by R.

Therefore, only the television image that depends on the cathode ray tube 8 can be viewed.

Also, on the screen of the cathode ray tube 8, as shown in FIG. 2A, a television image and a waveform S due to the audio signal of this television broadcast are displayed
When displaying 8 at the same time, 2nd class movable contacts 5a, 9a=
38a, 40a and 42a as respective second fixed contacts 5c
, 9c=38c.

40c and 42c, respectively.

At this time, the output signal of the video detection circuit 4 is supplied to the video amplification circuit 7V via the switch 5, and the video amplification circuit 1 is switched to normal operation 'kL-' or television broadcasting by the switch 9. The audio signal of the signal is supplied to the signal forming circuit 45R via the switch 38, and the signal forming circuit 45R generates a signal in which the audio signal and a constant DC signal alternately repeat every vertical period as shown in FIG. 4C. - This signal is applied to the gain controller 29H.
The output signal of the differentiating circuit 34I is supplied to the input terminal of the differentiating circuit 34I, and the output signal of the differentiating circuit 34I is supplied to the diode 41 so that the bright line position according to this signal is shifted to one side of the video screen to the right in FIG. 2A by the switch 40. and ground via the switch 42.

Therefore, at this time, the television image and the waveform of the signal from the differentiating circuit 34R can be displayed.

In this case, according to the present invention, for example, as shown in FIG. This becomes a straight line and becomes a reference line for the waveform associated with the audio signal during the odd field period, and this reference line can serve as a zero scale for the input signal.

Generally, when an audio signal is displayed using both an odd field and an even field, interlaced scanning is performed, so the phase of the display pulse signal shifts during this period, resulting in two bright lines, and this display waveform is difficult to see. According to the invention, in the above example of one field, since the display of the even field becomes a straight reference line, there is an advantage that the displayed waveform becomes easier to see.

Also, a switch 24 is displayed on the screen of the cathode ray tube 8 as shown in FIG. 2B.
and 25 movable contacts 24a and 25a when displaying two waveforms sL and SR based on the stereo signals obtained at the 25 movable contacts 24a and 25a, respectively.

9a, 38a, 40a and 42a are connected to the respective third fixed contacts 5d, 9d, 38d, 40d and 42d, respectively, and the movable contact 36a of the multipath signal display switch 36
is connected to one fixed contact 36b.

At this time, the output signal of the video detection circuit 4 is transmitted to the video amplification circuit 7.
is not supplied.

At this time, the brightness adjustment terminal of the video amplification circuit 1 is grounded through the resistor 10, and the background of the screen of the 1 m pole ray tube 8 is relatively dark 9, making the bright lines easier to see.

Also, at this time, the stereo display lamp 44 lights up.

In this case, the input side of each of the gain adjusters 29L and 29R is connected to an audio signal in one of the odd or even fields as shown in FIG. Since a DC signal is supplied and displayed on the cathode ray tube 8, the display of the even field period becomes a vertical straight line and also serves as a reference line for the waveform related to the audio signal of the odd field period. The displayed waveform becomes easier to see and this reference line can be used as a zero scale of the input signal.

Also, the movable contacts 5a, 9a, 38a = 40a and 42a are replaced by third fixed contacts 5d, 9d, 38d, respectively.

40d and 42d, respectively, and when the movable contact 36a of the multipath signal display switch 36 is connected to the other fixed contact 36C, the multipath signal can be displayed on the screen of the cathode ray tube 8 in the same manner as described above. , this television receiver can be used as a measuring device.

In this case as well, the display based on one field serves as the reference line, which is extremely convenient, as described above.

Further, in this example, a connection switch 4 is connected between the horizontal deflection output circuit 13 and the other input terminal of the horizontal automatic frequency control circuit 11.
6, and normally this connection switch 46 is closed.
Movable contacts 5 of each of the switching devices 5, 9, 38, 40 and 42
a=9a-38a-40a and 42a are the respective third fixed contacts 5d.

9at 38d, 40d and 42d, respectively, and when viewing the waveform of the stereo signal etc. obtained at the movable contacts 24a and 25a of the switching devices 24 and 25, on the screen of the cathode ray tube 8, this connection switch 46 is used. Make it open.

By doing so, the land connection switch 46 is normally closed, so that this television receiver operates in the same manner as before.

Also, the movable contacts 5a = 9a, 38a of the switching devices 5, 9, 38° 40 and 42, respectively.

40a and 42a are respective third fixed contacts 5d.

9dt 38d, 40d and 42d, respectively, and when viewing the waveform of the stereo signal etc. obtained at the movable contacts 24a and 25a of the switching devices 24 and 25, respectively, on the screen of the cathode ray tube 8, open the connection switch 46. horizontal oscillator 12
is in a free oscillation state and oscillates at the natural frequency of this horizontal oscillator 12, that is, the horizontal frequency, so when the television broadcast signal disappears, the horizontal automatic frequency control circuit 11
Even when the horizontal synchronizing signal supplied to one input terminal of the cathode ray tube 8 disappears, the waveform on the screen of the cathode ray tube 8 is not disturbed because it is not affected by the noise supplied to this one input terminal. , can display good waveforms.

Note that the present invention is not limited to the above-described embodiments, and various other configurations may be adopted without departing from the gist of the present invention.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram showing an embodiment of a television receiver according to the present invention, FIG. 2 is a diagram for explaining the present invention, and FIG.
The figure is a connection diagram showing an example of the main parts of the present invention, and FIG. 4 is a diagram for explaining the same. 4 is a video detection circuit; 5, 9, 38, 40, and 42 are respective switchers; 6 is a synchronization signal separation@wo; 1 is a video amplification circuit; 8
is a cathode ray tube, 20 is an audio signal output terminal, 22L or 22R
26L and 26R are left and right channel signal input terminals, 45L and 45R are signal forming circuits, 46 is a connection switch, 41 is a flip-flop circuit, and 47a is a vertical pulse input terminal.

Claims (1)

[Scope of utility model registration request] When displaying waveforms related to television images and other signals in a television receiver that allows the waveforms associated with the above-mentioned other signals to be viewed on a cathode ray tube, odd or even field A television receiver characterized in that one field displays a waveform and the other field displays a reference line of the waveform.