JPS5819884Y2 - Waveform display device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a waveform display device for displaying a waveform related to an audio signal, for example, on a cathode ray tube of a television receiver. The display position can be adjusted.

An example of a waveform display device that allows a television image and a waveform related to an audio signal to be switched and viewed on a cathode ray tube of a television receiver 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 from the above is supplied to the tuner device 2, and the output signal of this tuner device 2 is supplied to the input side of the video detection circuit 4 via the video intermediate frequency amplifier 3 - the output of this video detection circuit 4. The 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 end of the video amplification circuit 1.The third fixed contact 5d of this switch 5 is connected to each other. Ground.

The output signal of the video amplification circuit 7 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 through the brightness adjustment variable resistor 10a, and the first and second The connection point between the fixed contacts 9b and 9c and the variable resistor 10a is connected to a third fixed contact 9d via a resistor 10b that changes 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 so that the waveform of the audio signal can be easily seen.

Also, 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.The control signal obtained at the output side of this horizontal automatic frequency control circuit 11 is applied to the horizontal oscillator. 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 output to the cathode ray. The horizontal frequency signal obtained from the horizontal deflection output circuit 13 is 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 frequency signal obtained at the horizontal deflection output circuit 13, and responds accordingly to the error signal. The oscillation frequency of the horizontal oscillator 12 is controlled by this control signal.

Also, the vertical synchronization signal obtained at the other output terminal of the synchronization signal separation circuit 6 is supplied to the vertical oscillator 14 as a synchronization 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. and this mixing circuit 1
6 is supplied to the input side of the audio detection circuit 18, and the output signal of this audio detection circuit 18 is supplied to the muting circuit 1.
9f: Supplied to the audio signal output terminal 20 through which the audio signal is supplied to the speaker.

In this case, when the moving contact 21a of the changeover switch 21 is connected to one fixed contact 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 operates to mute this output signal when this continues for a predetermined period of time.

Also, when the movable contact 21a of this switching switch 21 is connected to the other fixed contact 21c, this muting circuit 19
is designed so as not to perform a muting operation.

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 respectively, and the left and right channel recording signals are supplied to one fixed contact 2 of each of the switchers 24 and 25, respectively.
4b and 25b, respectively, and 26a and 26R represent 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; 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 24a of this switch 24 is connected to a mixing circuit 30 via a relatively high resistance resistor 28L and a gain adjuster 29L.
Supplied to one input terminal of L.

This mixing circuit 30L generates a sawtooth wave signal synchronized with the audio signal to display the waveform supplied to one input terminal and the horizontal pulse obtained at the output side of the horizontal deflection output circuit 13. The sawtooth wave signal from the wave signal generation circuit 31 is superimposed.

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 30L is grounded via a variable resistor 32L for adjusting the display position, and this mixing side path 30L
The output side of is connected to the input side of the Schmitt trigger circuit 33I/) constituting the clipper circuit, and the signal obtained at the output side of this Schmitt trigger circuit 33L is connected to the differential circuit 34L.
and is supplied to the input side of the video amplification circuit 7 via the addition circuit 35.

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

Furthermore, the movable contact 25a of the switch 25 is connected to one fixed contact 36b of the multipath signal display switch 36 via a resistor 28R with a relatively high resistance value, and is also connected to the multipath terminal of the FM radio receiver. multipath signal input terminal 37
is connected to the other fixed contact 36c of this switch 36, and the movable contact 36a of this multipath signal display switch 36 is connected to the third fixed contact 38dK of the display content switch 38.
Also, the second fixed contact 38c of this display content switcher 38 is connected to the audio signal output terminal 20, and this second fixed contact 38c is connected to the audio signal output terminal 20.
In addition, the first fixed contact 38b of the display content switch 38 is set in an electrically floating state.

The movable contact 38a of the display content switch 38 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. A signal to be supplied to the other input terminal of the mixing circuit 30R and whose waveform is to be displayed in the mixing circuit 30R is superimposed on a sawtooth wave signal synchronized with the horizontal pulse.

The output side of this mixing circuit 30R 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.
0 movable contact 4Qa is grounded.

The output side of this mixing circuit 30R is connected to the input terminal of a Schmitt trigger circuit 33R constituting a clipper circuit. It is supplied to the input side of the amplifier circuit 1.

In this case, on the output side of the differentiating circuit 34R, one display pulse signal, for example, 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, a display signal such as an audio signal supplied to the input side of the gain adjusters 29L and 29H is mixed with a mixing circuit 30L.

30R, mixes the signal with a sawtooth wave signal synchronized with the horizontal pulse from the sawtooth wave generation circuit 31, and supplies this to the Schmitt trigger generators 33L and 33R, thereby generating, for example, audio signals. The phase of the clipping point changes in proportion to the amplitude of the signal, that is, it undergoes phase modulation, and this phase-modulated waveform is supplied to differentiating circuits 34L and 34R.

One positive-side phase-modulated pulse signal obtained at the output side of 34R per horizontal period is supplied to the input side of the video amplification circuit I via the adder circuit 35, and is applied to the cathode ray tube 8 in the horizontal direction. Display fluctuating vertical emission lines.

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
b, the third fixed contact 42d is connected to the power supply terminal B to which positive DC voltage is supplied via the stereo display rung 44, and the movable contact 42a of this switch 42 is grounded. .

In this case, the movable contacts 4a=9a, 38a-40a and 42a of the switching devices 5, 9, 38, 40 and 42 are made to interlock with each other.

That is, when displaying only a television image on the screen of the cathode ray tube 8, the second movable contacts 5a, 9a, 38a, 40a and 42a are replaced with the first fixed contacts 5b and 9b, respectively.

38b, 40b and 42b, respectively.

At this time, the output sides of the differentiating circuits 34L and 34R are grounded via diodes 43L and 43R, respectively, and the output signals of the differentiating circuits 34L and 34R are connected to the video amplification circuit 1.
so as not to be supplied to

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 causes the video amplification circuit 7 to operate normally.

Also, at this time, the output sides of the differentiating circuits 34L and 34R are grounded via diodes 43L and 43R.

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 at the same temple, the movable contacts 5a, 9a, etc.
38a, 40a and 42a as respective second fixed contacts 5c
, 9cm38c.

40c and 42c, respectively.

At this time, the output signal of the video detection circuit 4 is supplied to the video amplification circuit 7 via the switch 5, and the video amplification circuit I operates normally depending on the switch 9. The audio signal of the signal is passed through the switch 38 to the gain controller 29.
The input terminal of the differential circuit 34L is supplied to the input terminal of the differential circuit 34L, and the output signal of the differentiating circuit 34L is connected to the diode 41 so that the bright line position according to the audio 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.

Also, a switch 24 is displayed on the screen of the cathode ray tube 8 as shown in FIG. 2B.
and 25 movable contacts 5as9a, 38a, 40a and 4 when displaying two waveforms SL and SR based on the stereo signals obtained at the respective movable contacts 24a and 25a.
2a to the respective third fixed contacts 5a, 9as 38d, 4
0d and 42d, respectively, and the movable contact 36a of the multipath signal display switch 36 is connected to the two fixed contacts 36b.

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

At this time, since the brightness adjustment terminal of the video amplification circuit 1 is grounded via the resistor 10, the background of the screen of the cathode ray tube 8 becomes relatively dark, making the bright lines easier to see.

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

Also, the movable contacts 5a, 9a = 38a-40a and 42a are connected to the respective third fixed contacts 5d, 9d, 38d, 40d and 4
2d 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, and this television reception The machine can be used as a measuring device.

In the example shown in FIG. 1, the waveform is displayed on the screen of the cathode ray tube 8 by the display pulse signal obtained only in the even field or only in the odd field, and the waveform is distorted due to the phase difference between the even field and the odd field. It is designed to eliminate the

For this reason, in FIG. 1, the vertical pulse obtained from the vertical deflection output circuit 15 is supplied to the trigger pulse input terminal 45a of the flip-flop circuit 45, and the output terminal of this flip-flop circuit 45 is connected to each of the diodes 43L and 43R. diodes 43L and 43R are made conductive every l field, and at this time, the differentiating circuit 34
The output signals of L and 34R are not supplied to the adder circuit 35.

Furthermore, in this example, a connection switch 46 is inserted between the horizontal deflection output circuit 13 and the other input terminal of the horizontal automatic frequency control circuit 11, and the connection switch 46 is normally closed and the switch 5 is closed. , 9, 38° 40 and 42, the respective movable contacts 5a = 9a, 38a, 40a and 42a are connected to the respective third
Fixed contact 5d.

9d, 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, turn on this connection switch 46. Make it open.

According to this configuration, since the connection switch 46 is normally closed, this television receiver operates in the same manner as before.

In addition, the movable contacts 5a, 9a = 38a, 40a, and 42a of the switching devices 5, 9, 38, 40, and 42 are connected to the husband's third fixed contacts 5d, 9d, 38d, 40d, and 42d, respectively, and switching is performed. When viewing the waveforms of the stereo signals etc. obtained at the movable contacts 24a and 25a of the oscillators 24 and 25 on the screen of the cathode ray tube 8, the connection switch 46 is opened to set the horizontal oscillator 12 in a free oscillation state. 1
Since it oscillates at the natural frequency of 2, that is, the horizontal frequency, the television broadcast signal disappears and the horizontal automatic frequency control circuit 11
Even when the horizontal periodic 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.

The present invention relates to such a waveform display device, and is designed to effectively adjust the display position of the waveform on the cathode ray tube.

An embodiment of the waveform display device of the present invention will be described below with reference to FIG.

In this example, gate circuits 47L and 4 are provided between gain adjusters 29L and 29R and mixing circuits 30L and 30R, respectively.
7R is inserted, and the gate circuits 47L and 47R are controlled by the output signals of gate control circuits 48L and 48H, respectively.

That is, the gate circuits 47L, 47R are normally in a conductive state, and are made non-conductive when a control signal is present on the output side of the gate control circuits 48L, 48R.

The gate control circuits 48L and 48R are configured to output a control signal when they grip and touch the heirs of the variable resistors 32L and 32R, respectively, for adjusting the display position.

Since the present invention is constructed as described above, the variable resistor 32L or 32 is used to adjust the display position of the waveform on the cathode ray tube 8.
When holding R's legitimate child, gate control circuit 48L or 48R
A control signal is obtained at the output of the gate circuit 47L or 47R, and the gate circuit 47L or 47R is rendered non-conductive by this control signal.

Therefore, at this time, no AC signal is applied to one input side of the mixing circuit 30L or 30R.

For this reason, the signal supplied to the input side of the Schmitt trigger circuit 33L or 33R is a sawtooth wave signal with a horizontal period on which a constant DC bias determined by the variable resistor 32L or 32R is superimposed. The upper display is a vertical straight line at the zero level of the displayed waveform, as shown by the broken line in FIG.

As described above, according to the present invention, when the heirs of the variable resistors 32L and 32R for adjusting the waveform position are contacted, there is no signal and the waveform to be displayed becomes a straight line at the zero level, making position adjustment easy. There is a profit.

Also, variable resistors 32L and 32R are used for position adjustment when adjusting the position.
The cathode ray tube displays a straight line, allowing extremely effective positioning.

In the above embodiment, the variable resistor 32L for position adjustment is used.
By touching the heirs of variable resistors 32L and 32R, the display on the cathode ray tube was set to the zero level line of the waveform.Instead, when the heirs of variable resistors 32L and 32R are activated, the display on the cathode ray tube becomes Of course, even if the waveform is set to a zero level line, the same effect as described above can be obtained.

Furthermore, 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 the drawing]

FIG. 1 is a configuration diagram showing an embodiment of the waveform display device of the present invention;
FIG. 2 is a diagram for explaining FIG. 1. 4 is a video detection circuit, 5, 9, 38, 40, and 42 are switching devices, 6 is a synchronization signal separation circuit, 7 is a video amplification circuit, 8
is a cathode ray tube, 20 is an audio signal output terminal, 22L and 22
R are recording signal input terminals, 26L and 26R are left and right channel signal input terminals, 32L and 32R are variable resistors for position adjustment, 47L and 47R are gate circuits, and 48L and 48R are gate control circuits, respectively. It is.

Claims (1)

[Scope of utility model registration request] In a waveform display device configured to display a waveform on a cathode ray tube, when a position adjusting heir of the waveform is touched or activated, the display of the cathode ray tube becomes the zero level line of the waveform. A waveform display device characterized in that: