JPS5828218Y2 - Voice noise measurement device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an audio noise measuring device for measuring S/N characteristics of broadcasting equipment.

Conventionally, when measuring the S/N of audio from broadcast equipment, a method has been used in which the input side is left in a no-signal state after the broadcast ends, the output signal level is measured, and the ratio with the reference audio signal is determined.

However, since S/N is an important characteristic element of audio broadcasting, it is desirable to monitor it even during broadcasting.

Furthermore, if the deterioration state of broadcasting equipment can be detected during broadcasting without waiting until the end of broadcasting, countermeasures can be taken such as immediately switching to a standby equipment.

This invention detects the no-signal state from the program sound being broadcast, and measures the audio signal level of the broadcast equipment output during the no-signal period, making it possible to measure S/H even during the broadcast. The present invention provides a noise measurement device.

That is, according to the present invention, the first level detector detects non-modulation of audio during broadcasting, and the control output signal of the level detector measures the audio signal level of the output of the device under test only during the non-modulation period. It is equipped with a second level detector and a third detector that detects the level of the carrier wave output among the outputs of the equipment under test, and the S/N of the audio signal being broadcast every time there is a non-modulation period.
A speech noise measurement device is obtained which is characterized in that it automatically measures .

Furthermore, by storing the measurement results as digital data in a memory circuit, updating the near data every time a no-signal state is detected, and displaying the stored content on a data output device such as a digital controller, S/O can be used even during broadcasting. N
This makes it possible to measure

Hereinafter, the present invention will be described in detail with reference to the drawings showing an embodiment of the present invention.

The drawing shows an example of a voice noise measurement device applied to a medium wave broadcasting transmitter.The voice noise measurement device 1 surrounded by a broken line receives as input an input voice signal 101 of a system under test 2 and an output of the system under test. A high frequency output 102 is supplied.

In the voice noise measuring device 1, the level of the voice signal 1010 is detected by the level detector 4.

The detected output is supplied to the level comparator 5 as a DC output.

The level comparator 5 determines whether the DC level is below a preset reference level or not, and outputs a low logic level when it is below the reference level and a high logic level otherwise.

The delay timer 6 counts the time from when the voltage falls below the reference level, and after t time has elapsed, the flip-flop circuit 7 is set.

Here, t compensates for the delay of the system under test.

The high frequency output 102 is transmitted to the audio signal 103 by the receiver 10.
and a carrier wave signal 104.

The audio signal 103 is input to the level detector 8, where it becomes a DC output.

The output of the level detector 8 is converted into digital data N by an A/D converter 9.

On the other hand, the carrier wave signal 104 similarly passes through the level detector 16, is converted into digital data S by another A/D converter 11, and is inputted together with the data N to the digital arithmetic circuit 12, 20, /, or- is calculated, and the result of the calculation is stored in the memory 14.

The control for writing the calculation result into the memory 4 is performed by the output signal of the flip-flop circuit 7, which is set by the output of the timer 6 to the high level output of the level comparator 5, that is, the audio signal. is reset when the level becomes greater than the reference level.

In this way, the memory 4 is write-controlled by the output signal of the flip-flop circuit 7 so that writing is possible only during the no-signal detection period.

On the other hand, since the flip-flop 7 is reset via the OR circuit 13 every time the conversion completion control signal from the A/D converter 9 is output, the stored contents of the memory 14 will be changed to the measurement time if no signal continues after . It will be updated.

The contents of the memory 14 are read out by four read signals.
It is displayed on the digital display 15.

As explained above, according to the present invention, it is possible to detect the no-signal state during broadcasting and automatically measure the S/N characteristics of the broadcasting equipment, so it is possible to constantly monitor the characteristics during N broadcasting, and to check the deterioration state of the equipment. It can be detected early and provides great convenience in the operation and maintenance of broadcasting equipment.

[Brief explanation of the drawing]

The drawing is a block diagram showing an embodiment of the present invention. In the figure, 1... speech noise measuring device ~ 2...
...Device to be measured, 3...Antenna, 4.8.
16...Level detector, 5...Level comparator, 6...Delay timer, 7゜13...
... OR circuit, 9.11 ... A/D converter,
10... Receiver, 12... Arithmetic circuit,
14... Memory element, 15... Digital display.

Claims (1)

[Scope of utility model registration request] A first detector receives an audio input signal of broadcast equipment and detects non-modulation; a second detector detects an audio signal level from the output of the broadcast equipment; and a carrier wave signal level from the output of the broadcast equipment. a third detector for detecting , a measuring means for digitally extracting S/N from the outputs of the second and third detectors, a memory for storing the output of the measuring means, and a display for displaying the output of the memory. 1. A speech noise measuring device, comprising: display means, and writing to the memory is controlled by the output of the first detector.