KR100222838B1 - Trigger device for checking audio signal of TV - Google Patents

Abstract

The present invention relates to a trigger device for inspecting an audio signal of a television.

In the triggering apparatus for inspecting an audio signal of a television according to the present invention, the audio signal inspection of a television depends on the hearing of the inspector, which may cause a fatal damage to the inspector's hearing. As it can be different, it is possible to solve various problems, such as difficulty in expecting a uniform quality, and by implementing an apparatus for generating an audio trigger signal for inspecting an audio signal on a television, The audio signal can be easily measured.

Description

Trigger device for checking audio signal of TV

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a trigger device for inspecting an audio signal of a television. In particular, by implementing an apparatus for generating an audio trigger signal for inspecting an audio signal in a television, an audio signal for the television can be easily measured. The present invention relates to a trigger device for inspecting an audio signal of a television.

In general, a process of producing a television includes a process of inspecting an audio signal. In the conventional method of inspecting an audio signal of a television, an apparatus for measuring an audio signal includes an accurate trigger pointer for a frequency of an audio signal of the television. As shown in FIG. 1, the improvement and problems of the speaker 11 of the television 10 or the prior art which the present invention solves in this prior art are to examine the audio signal inspection of the television. Due to the fact that it depends on the hearing, it can cause serious damage to the inspector's hearing, and there are various problems such as difficulty in expecting uniform quality because the inspector can have different hearing and judgment results. .

The present invention has been made to solve the above problems and to achieve an improvement.

Accordingly, an object of the present invention is to implement an apparatus for generating an audio trigger signal for inspecting an audio signal in a television, so that a trigger device for inspecting an audio signal of a television can be easily measured. To provide.

As a technical means for achieving the above object of the present invention, the triggering apparatus for inspecting an audio signal of a television of the present invention includes a sawtooth wave generator for processing the input audio signal to generate a sawtooth wave signal; A waveform transformation unit configured to output a square wave signal by modifying the sawtooth wave signal from the sawtooth wave generation unit; A maximum / minimum detection unit for detecting a maximum value (SM _MAX ) or a minimum value (SM _MIN ) in the sawtooth wave signal from the sawtooth wave generation unit; A reset unit for outputting a reset signal when an output value of the maximum / minimum detection unit and an output value of the sawtooth wave generation unit are the same; A frequency multiplier which is reset by the reset signal of the reset unit and multiplies the frequency from the waveform transform unit at a predetermined magnification to output a multiplication signal; A monostable multi-vibrator for outputting a single pulse signal by varying the width of the reset signal from the reset unit; A logical operation unit for performing an AND operation on the output signal of the frequency multiplier and the output signal of the monostable multivibrator to output an AND product; And a monostable multivibrator for outputting a trigger signal by varying a width of an output signal of the logic operation unit.

1 is a diagram for explaining a method of inspecting an audio signal of a conventional television.

2 is a circuit diagram of a triggering apparatus for inspecting an audio signal of a television according to the present invention;

3 is a signal timing chart for the output waveform of the main block according to the present invention,

4 is a block diagram of the maximum / minimum detection unit 30 for the maximum value detection in accordance with the present invention,

5 is a block diagram of the maximum / minimum detection unit 30 for the maximum value detection in accordance with the present invention.

* Explanation of symbols for main parts of the drawings

10: saw tooth generating unit 11: pre-treatment unit

13: LPF 14: Amplifier

15: VCO 20: waveform transformation unit

22: sine wave part 24: square wave part

30: maximum / minimum detector 32: comparator

34: counter 36: D / A converter

40: reset section 42: differential amplifier

44: comparator 50: frequency multiplication

60: monostable multivibrator 70: logic operation unit

80: monostable multivibrator

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of a triggering apparatus for inspecting an audio signal of a television according to the present invention will be described with reference to the accompanying drawings. In the drawings referred to in the present invention, components having substantially the same configuration and function will use the same reference numerals.

2 is a circuit diagram of a triggering apparatus for inspecting an audio signal of a television according to the present invention. Referring to FIG. 2, the triggering apparatus for inspecting an audio signal of a television according to the present invention is an audio signal (Sin). The maximum value SM _MAX or the minimum value of the waveform transformation part 20 which transforms the sawtooth wave signal S1 and outputs the square wave signal S3, and the sawtooth wave signal S1 from the sawtooth wave generation part 10. The reset signal S4 is reset when the maximum / minimum detector 30 that detects SM _MIN and the output value of the maximum / minimum detector 30 and the output value of the sawtooth wave generator 10 are the same. Next, the frequency multiplier 50 outputs a multiplication signal S5 by multiplying the frequency from the waveform modifying unit 20 by a predetermined magnification, and the width of the reset signal from the reset unit 40 is varied. To output a single pulse signal (S6) Concentrator 60, and a logic operation unit 70 for outputting a logical product signal (S7) is multiplied by the output signal of the logic output signal and a monostable multivibrator (60) of the frequency distribution body (50); The monostable multivibrator 80 outputs the trigger signal ST by varying the width of the output signal S7 of the logic unit calculating section 70.

In addition, the sawtooth wave generation unit 10 feeds back through the VCO 15 from the pre-processing unit 11 and the output value of the pre-processing unit 11 to adjust the size of the input audio signal (Sin) to be processed later. LPF 13 for subtracting the subtracted value and leveling the subtracted signal to DC level, an amplifier 14 for amplifying and outputting the output signal of the LPF 13 to a predetermined level, and an output signal of the amplifier 14 It consists of a VCO (15) for feeding back a frequency according to.

The waveform transform unit 20 includes a square wave unit 22 for converting an input sawtooth signal into a sinusoidal wave signal, and a square wave unit 24 for converting the sinusoidal wave signal of the sinusoidal wave unit 22 into a square wave signal.

The maximum / minimum detection unit 30 compares the input sawtooth wave signal with a reference value set therein, and outputs a high level when it is not the same, and outputs a low level when it is the same, and the comparator 32. If a high level is provided, the counter 34 repeats the counting operation, and if a low level is provided, the counter 34 stops the counting operation and outputs the value. After the counting value is converted into an analog value, a D / A converter 30 is provided to the comparator 32 as a reference value.

The reset unit 40 is a differential amplifier 42 for amplifying and outputting a difference between the output value from the maximum / minimum detector 30 and the sawtooth signal, and when there is no output signal of the differential amplifier 42 The comparator 44 outputs short pulses.

4 is a configuration diagram of the maximum / minimum detection unit 30 for the maximum value detection according to the present invention, and FIG. 5 is a configuration diagram of the maximum / minimum detection unit 30 for the minimum value detection according to the present invention. Referring to FIG. 5, when the reference value is set to zero level by the maximum / minimum detection unit 30, the counter 34 is configured as an up counter, and the reference value is larger than the maximum value of the input signal. When the value is set to a large value, the counter 34 is configured as a down counter.

Operation according to the device of the present invention configured as described above will be described in detail below based on the accompanying drawings. Referring to FIG. 2, FIG. 3, FIG. 4, and FIG. 5, the audio signal Sin shown in FIG. 3 has a constant amplitude and the frequency ranges from 20 Hz to 20 KHz. It is a signal that gradually increases in frequency and then suddenly decreases to low frequency. In the present invention using this signal Sin instead of the audio signal of the television, the trigger pointer can be caught at a desired point with respect to the audio signal of the television, which will be described below.

The sawtooth wave generator 10 shown in FIG. 2 outputs the sawtooth wave signal S1 according to the frequency of the input audio signal Sin. The sawtooth wave signal S1 becomes larger in size as the frequency increases. , When suddenly lowered to a low frequency, the magnitude suddenly drops and becomes a sawtooth wave signal S1 as shown in FIG.

The sawtooth wave signal S1 of the sawtooth wave generator 10 is transformed from the waveform transform unit 20 to the square wave signal S3 for accurate and stable operation of the circuit block with respect to the signal. The sinusoidal wave section 22 is transformed into a sinusoidal wave signal S2, which is transformed from the sinusoidal wave section 22 of the waveform transformation unit 20 into a sinusoidal wave signal S2 and then the square wave section 24 in the square wave signal S3. Is transformed into the frequency multiplier 50.

On the other hand, the maximum / minimum detection unit 30 detects the maximum value (SM _MAX ) with the configuration shown in FIG. 4 with respect to the sawtooth wave signal S1 from the sawtooth wave generation unit 10 by the reference value setting and the counter. After detecting the minimum value SM _MIN with the configuration shown in FIG. 5, the detected maximum value or minimum value is provided to the reset unit 40. The operation will be described.

First, referring to FIG. 4, the operation of detecting the maximum value of the sawtooth wave signal S1 will be described. The comparator 32 compares the input signal S1 with an initially set reference value SF _MIN : ZERO level. When the two values are different from each other, a high level is output, and according to the high level, the up counter 34 performs an up counting operation, and the counting value is converted into an analog value by the D / A converter 36. The comparator 32 is inputted to the comparator 32 through a reference value setting step, and the comparator 32 performs a re-comparison with the input signal and the preset reference value. When it is determined that the input signal S1 and the reference value are the same and the low level is output, the up counter 34 stops the counting operation and resets the maximum value, which is the last count value of the up counter 34, to the maximum value. To provide.

Next, referring to FIG. 5, the operation of detecting the minimum value of the sawtooth wave signal S1 will be described. The comparator (S _MAX ) and the preset reference value (SF _MAX : a value larger than the maximum value of the sawtooth wave signal) 32, when the two values are different from each other, a high level is output. According to the high level, the down counter 34 performs a down counting operation, and the counting value is an analog value in the D / A converter 36. After the conversion to the input value is input to the comparator 32 through the reference value setting stage, the comparator 32 performs a re-comparison with the input signal and the reset reference value, and repeats this process If it is determined at 32 that the low level is output, the up counter 34 stops the counting operation and provides the reset unit 40 with the minimum value, which is the last count value of the down counter 34.

In the present invention, description will be made using the maximum / minimum detector 30 for detecting the maximum value shown in FIG. 4 as a basic circuit diagram.

The reset unit 40 generates a reset signal when the maximum value detected by the maximum / minimum detection unit 30 is equal to the input sawtooth signal, that is, when the maximum value of the sawtooth signal S1 is detected. 50), the differential amplifier 42 of the reset unit 40, when the two signals are the same, that is, there is no output signal at the maximum value of the input sawtooth wave signal (almost zero level level), the comparator of the rear stage 44 outputs a reset signal when no signal is input.

The frequency multiplier 50 is reset by the reset signal, and then multiplies the frequency from the waveform 20 by a predetermined magnification, and outputs the result to the logic operator 70. The width of the reset signal of the reset unit 40 is varied in accordance with a predetermined time constant in the monostable multivibrator 60, and then provided to the logic operation unit 70. The two signals shown in FIG. 3 are logically multiplied and then output to the monostable multivibrator 80. The monostable multivibrator 80 width modulates the pulse by the logical product to a predetermined width to trigger a signal. (ST) is finally output.

As described above, in the present invention, as shown in FIG. 3, the trigger signal can catch the trigger pointer at the point in time at which the frequency of the input audio signal is the highest. With the configuration shown in Fig. 1, the trigger pointer can be caught at the lowest frequency point. The present invention enables the accurate trigger pointer to be caught with respect to the audio signal of the television. The basis for automatic measurement of audio signals is provided.

According to the present invention as described above, there is a special effect of making it possible to easily measure an audio signal for a television by implementing an apparatus for generating an audio trigger signal for inspecting an audio signal in a television.

The above description is only a description of one embodiment of the present invention, the present invention is capable of various changes and modifications within the scope of the configuration. In addition, one of ordinary skill in the art will readily recognize that the trigger device for inspecting an audio signal of the television is not limited to the above-described embodiment.

Claims (6)

Sawtooth wave generation unit 10 for processing the input audio signal (Sin) to generate a sawtooth wave signal (S1); The sawtooth wave generator 10; A waveform modification unit 20 for outputting a square wave signal S3 for generating a sawtooth wave signal S1 from the sawtooth wave generation unit 10; A maximum / minimum detection unit 30 for detecting a maximum value SM _MAX or a minimum value SM _MIN from the sawtooth wave signal S1 from the sawtooth wave generation unit 10; A reset unit 40 for outputting a reset signal S4 when the output value of the maximum / minimum detection unit 30 and the output pack of the sawtooth wave generation unit 10 are the same; The frequency multiplier 50 which is reset by the reset signal S4 of the reset unit 40 and then multiplies the frequency from the waveform modifying unit 20 by a predetermined magnification to output a multiplication signal S5. ); A monostable multivibrator (60) for varying the width of the reset signal from the reset unit (40) and outputting a single pulse signal (S6); A logic operation unit (70) for performing an AND operation on the output signal of the frequency multiplier (50) and the output signal of the monostable multivibrator (60) to output a logical product signal (S7); And a monostable multivibrator (80) for varying the width of the output signal (S7) of the logic operation unit (70) to output the trigger signal (ST). According to claim 1, wherein the sawtooth wave generator 10 is a pre-processing unit 11 for adjusting the size of the audio signal (Sin) to be processed at the rear end, and VCO (15) in the output value of the pre-processing unit (11) LPF 13 for subtracting the value fed back through the circuit, and leveling the subtracted signal to DC level, an amplifier 14 for amplifying and outputting the output signal of the LPF 13 to a predetermined level, and the amplifier 14 And a VCO (15) for feeding back a frequency according to the output signal of the apparatus. [2] The waveform wave forming unit (20) of claim 1, wherein the waveform transform unit (20) includes: a square wave unit (22) for converting an input sawtooth signal into a sine wave signal; Trigger device for audio signal inspection of the TV, characterized in that consisting of. The comparator 32 according to claim 1, wherein the maximum / minimum detection unit 30 outputs a high level when it is not the same as compared with an input sawtooth signal and a reference value set therein, and outputs a low level when it is the same. And a counter 34 which repeats the counting operation when the high level is provided from the comparator 32 and outputs the value after stopping the counting operation when the low level is provided. And a D / A converter (36) which converts the counting value from the counter (34) into an analog value and then provides it to the comparator (32) as a reference value. The differential amplifier 42 and the output of the differential amplifier 42 according to claim 1, wherein the reset unit 40 amplifies and outputs a difference between the output value from the maximum / minimum detection unit 30 and the sawtooth wave signal. And a comparator (44) for outputting short pulses in the absence of a signal. 5. The method of claim 4, wherein when the reference value is set to zero level by the maximum / minimum detection unit 30, the counter 34 is configured as an up counter, and the reference value is set to a value larger than the maximum value of the input signal. The trigger device for testing the audio signal of the television, characterized in that the counter 34 is configured as a down counter.