JPS6184133A - Device for managing quality of radio broadcast - Google Patents

Abstract

PURPOSE:To obtain a broadcast managing device with small size while coping with a change in a delay time by coding a sound signal to retard it, monitoring the sound to discriminate whether or not it is to be broadcast and applying fade-in, fade-out to the coded sound. CONSTITUTION:An input sound signal 11 is converted into a digital value 12 by an A/D converter 1, written into a memory 19 by an address 20 from a write address circuit 4 of a delay circuit 2, a delayed signal 13 is read from the memory 19 at an address 18 made by subtracting a variable delay data 9 from the address 20, and the result is inputted to a muting circuit 6. When a switch SW1 is turned off, a coefficient 8 from a counter 3 outputs a digital signal 14 with 1 level and outputs a sound signal 15 subjected to D/A conversion. The signal 11 is monitored by a monitor circuit 23 and when it is discriminated that the sound signal is not suitable for broadcasting, the SW1 is turned on to bring the coefficient 8 to 0 level thereby fading out the output sound signal 15. In turning off the SW1, the coefficient 8 is brought into 1 level and the sound signal is subject to fade-in.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a radio broadcast quality control device, and particularly to a radio broadcast quality control device using a digital delay circuit.

[Conventional technology]

In order to monitor and eliminate sudden garbled audio or prohibited words for broadcasting during live broadcasting, a delay device is required to delay the audio for about 10 seconds or more. Conventionally, this delay device has been implemented by using a tape recorder to widen the distance between the recording head and the reproducing head. For example, the tape running speed is 38
When ~-, an interval of 3805I is required to delay for 10 seconds. However, in this case, due to the structure of the tape recorder, the device itself is large and the delay amount of the audio signal is fixed.

[Problems to be solved]

The present invention solves the conventional problem that the delay device is structurally large and the delay amount of the audio signal is fixed. It is something to do.

[Means for solving problems]

The radio broadcasting quality control devices of the present invention include an A/D and D/A converter that encodes and decodes audio signals, a delay circuit that delays encoded digital data, and a monitor that monitors input audio signals. By adopting a configuration consisting of a monitor circuit for deleting the digital audio signal, a switch for deleting the audio signal, and a muting circuit equipped with a fade-in/fade-act circuit for deleting the digital audio signal based on the signal, the above-mentioned problem can be achieved. It solves the conventional problems.

〔Example〕

Next, an embodiment of the present invention will be described using FIGS. 1 and 2. As shown in FIG. 1, this radio broadcasting quality control device has an A/D and a D/A for encoding audio signals:
It is composed of ff inverters 1 and 5, a delay circuit 2, a muting circuit 6 for erasing audio, a SW1 for erasing audio, and a monitor circuit 13 for monitoring an input audio signal. Delay circuit 2fi digital memory 19
, a write address generator 4, and read address generators 9 and 21 to enable variable delay. The voice cancellation circuit 6 is an up/down counter 3
and a multiplier 7. Input audio signal 11ri,A
/D converter l converts it into a digital value of 12,
The data is written into the address 20 specified by the write address circuit 4 of the memo+319. Data reading from the memory 19 was generated by subtracting variable delay data 9 from the write address 20. This is done by the address 18 and is input to the muting circuit 6 through the signal line 13. This delay circuit 2#i has a memory sufficient to obtain an audio delay of at least 10 seconds, and can be varied in steps from 0 seconds to the maximum delay allowed by the memory capacity by varying the delay data. In the erase circuit 6,
A multiplier 7 calculates a coefficient 8 generated from a counter 3 on the input digital data 13 and outputs the result. Coefficient 8 is a digital value from 0 to 1, and is the oN of switch SWI.
- controlled by orp. Output data from the muting circuit 6 passes through the signal line 14 to the D/A
It is input to the co/parter 5. Further, it is decoded by a D/A:t noverter 5 to obtain an output audio signal 15. The audio signal is erased by turning on the switch SWI. The operation at this time will be explained with reference to FIG. switch S
When WI is in the OFF state, the signal line 16 is )(i gh
level, counter 3 is in UP mode, coefficient 8 is l
is being held.

(Second worst ■ switch 5 WION state period) At this time, when switch SWI is turned ON, the switch connection section 16 goes to L.
When the OW level is not reached, the counter switches to the DUWN mode and the coefficient 8 changes from 1 to 0 in small increments of 22 clocks and is held at 0 (indicates the period ■ in Figure 2). The output audio signal 15 fades out. If you continue to hold the switch SWI in this state, the audio will remain deleted (period ■ in Figure 2) 6 When you turn off the switch SW1 again, the signal line 16 will go to the light level again and the counter will switch to FiUP mode. changes from 0 to 1 by the clock 22 and is held at 1. Due to the change in this coefficient, the output audio signal 15 fades in (as shown in the period ``■'' in FIG. 2).

this! ! At any time, the monitor listens to the human-powered audio signal through the speaker 10, and adjusts the switch SWI to 0NA.
It is possible to erase the audio in IR without clicking.

〔Effect of the invention〕

As explained above, the radio broadcasting quality control device of the present invention includes an A/D and D/A converter that encodes and decodes an audio signal, a delay circuit that delays encoded digital data, and an input It is made up of a monitor circuit for monitoring the audio signal, a switch for erasing the audio signal, and a muting circuit with a fade-in/fade-act circuit for erasing the digital audio signal using the signal. By monitoring the input audio signal with a monitor circuit, it is possible to judge whether or not it can be broadcast, and use an audio switch that is unsuitable for broadcasting to eliminate it.Compared to its predecessor, it is possible to be more compact, and it has zero delay time. Able to cope with change,
Furthermore, there is an effect that no clicks occur.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram showing an embodiment of the present invention, and FIG. 2 is a diagram showing the output signal state when the switch is ON-OFF. It is A1m. 1...A/D converter 2...Delay circuit 5...
・D/A converter 6...muting circuit 1
1... Input audio signal 23... Monitor circuit SW
I...Switch

Claims (1)

[Claims] A/D and D/A converters for encoding and decoding audio signals, a delay circuit for delaying encoded digital data, a monitor circuit for monitoring input audio signals, and a circuit for erasing audio. A radio broadcast quality control device consisting of a switch and a muting circuit equipped with a fade-in/fade-out circuit that erases a digital audio signal using the switch.