CN214707870U - Broadcasting system capable of automatically controlling loudness - Google Patents

Abstract

The utility model discloses an automatic broadcast system of control loudness, including input signal source, a plurality of director signal sources, signal selector, audio loudness controller, encoder and customer end, a plurality of director signal sources all are connected with signal selector's input through the data transmission line and the director signal source all is connected with signal selector communication, input signal source and light receiver communication are connected, and light receiver passes through the data line communication with signal selector's input; the automatic loudness control broadcasting system can automatically carry out automatic loudness operation processing on embedded audio in high-definition digital signals according to a preset loudness value through the audio loudness controller, carries out real-time loudness calculation on the audio signals by utilizing a digital signal processing technology, and carries out audio compression, expansion, amplitude limiting control, a noise gate and gain adjustment on the loudness of the audio, thereby ensuring that the loudness of the broadcast sound is kept stable and bringing better experience to users.

Description

Broadcasting system capable of automatically controlling loudness

Technical Field

The utility model relates to a media instructor in broadcasting field, concretely relates to broadcasting system of automatic control loudness.

Background

In the current social development, television programs are very important entertainment modes for most people, the experience of viewers is directly determined by the quality of the television program broadcasting quality, the viewing experience of the viewers is greatly influenced by the inconsistent sound loudness in the actual program broadcasting process, and the viewing of the viewers and the improvement of the program effect and quality of television stations are not facilitated.

SUMMERY OF THE UTILITY MODEL

The loudness control problem is always a very key control link in the process of broadcasting television programs, once the loudness of sound is inconsistent, the watching experience of audiences can be seriously influenced, in order to carry out strict and standard requirements on the broadcasting quality of the television programs, the loudness control method is used as a broadcast television station which must strictly strengthen the control on the loudness of sound in the process of broadcasting the television programs, and the poor watching experience caused in the actual watching process of the audiences is avoided.

Therefore, the present application provides a broadcasting system for automatically controlling loudness in response to the above-mentioned requirement of loudness control.

In order to achieve the above purpose, the following scheme is provided: the utility model provides an automatic broadcasting system of control loudness, includes input signal source, a plurality of director signal sources, signal selector, audio loudness controller, encoder and customer end, a plurality of director signal sources all are connected through the data transmission line and the director signal source all is connected with the signal selector communication with the input of signal selector, input signal source and light receiver communication are connected, and light receiver passes through the data line communication with the input of signal selector and is connected, the signal selector passes through the data line communication with the audio loudness controller and is connected, and the audio loudness controller passes through the data line communication with the encoder and is connected, and the encoder passes through the data line communication with the customer end and is connected.

Further, the audio loudness controller comprises an RS422 interface, an SDI input interface, a first SDI output interface and a second SDI output interface, the RS422 interface is connected with an external control panel, the SDI input interface is connected with the signal selector through a data line, and the first SDI output interface and the second SDI output interface are connected with the client through data lines.

The utility model discloses a theory of operation and advantage lie in: the automatic loudness control broadcasting system can automatically carry out automatic loudness operation processing on embedded audio in high-definition digital signals according to a preset loudness value through the audio loudness controller, carries out real-time loudness calculation on the audio signals by utilizing a digital signal processing technology, and carries out audio compression, expansion, amplitude limiting control, a noise gate and gain adjustment on the loudness of the audio, thereby ensuring that the loudness of the broadcast sound is kept stable and bringing better experience to users.

Drawings

FIG. 1 is a schematic diagram of the system of the present invention;

fig. 2 is the utility model audio loudness controller.

Reference numerals in the drawings of the specification include:

1. input signal source, 2 optical receiver, 3 director signal source, 4 signal selector, 5 audio loudness controller, 6 encoder, 7 client, 51 RS422, 52 SDI input interface, 53 first SDI output interface, 54 second SDI output interface.

Detailed Description

The following is further detailed by the specific embodiments:

as shown in fig. 1, an automatic loudness control broadcasting system includes an input signal source 1, a plurality of broadcast guide signal sources 3, a signal selector 4, an audio loudness controller 5, an encoder 6, and a client 7, where the plurality of broadcast guide signal sources 3 are all connected with an input end of the signal selector 4 through a data transmission line and the broadcast guide signal sources 3 are all connected with the signal selector 4 in communication, the input signal source 1 is connected with an optical receiver 2 in communication, the optical receiver 2 is connected with an input end of the signal selector 4 in communication through a data line, the signal selector 4 is connected with the audio loudness controller 5 in communication through a data line, the audio loudness controller 5 is connected with the encoder 6 in communication through a data line, and the encoder 6 is connected with the client 7 in communication through a data line.

The input signal source 1 is a CCTV signal, the CCTV signal is received and processed by the optical receiver 2 and then transmitted to the signal selector 4, the director signal source 3 is transmitted by the director system and then directly conducted to the signal selector 4, the signal selector 4 is a device for automatically selecting an expected signal from a plurality of signal sources, the signal selector 4 receives the signal and then selectively transmits the signal to the audio loudness controller 5, the loudness controller processes the audio signal and then transmits the processed signal to the client 7, and the client 7 is audio playing equipment or other audio processing equipment.

As shown in fig. 2, the audio loudness controller 5 includes an RS422 interface 51, an SDI input interface 52, a first SDI output interface 53, and a second SDI output interface 54, the RS422 interface 51 is connected to an external control panel, the SDI input interface 52 is connected to the signal selector 4 by a data line, and both the first SDI output interface 53 and the second SDI output interface 54 are connected to the client 7 by a data line.

The RS422 interface 51 is used for connecting an external audio control panel, the SDI input interface 52 is used for inputting a high-definition digital signal into the audio loudness controller 5 (the audio loudness controller 5 can automatically adjust the loudness of embedded audio in the high-definition digital signal), the first SDI output interface 53 and the second SDI output interface 54 are both used for outputting the processed high-definition digital signal to the client 7, and the first SDI output interface 53 has a power-down through function.

The specific implementation process is as follows:

the working process of the broadcast system capable of automatically controlling the loudness is as follows, an input signal source 1 and a multi-channel director signal source 3 are simultaneously input into a signal selector, the signal selector 4 selects and outputs one high-definition digital signal according to a preset program and transmits the signal to an audio loudness controller, the high-definition digital signal output by the audio loudness controller 5 is compiled by an encoder 6 and then transmitted to a client 7, and the loudness control of the signal source embedded audio can be completed.

After a high-definition digital signal of an input signal source 1 or a director signal source 3 is input to an audio loudness controller 5, the high-definition digital signal passes through an ALC audio automatic loudness control module and is based on international standards such as BS.1770 (1-4) EBU R128, ATSC A/85, ARIB TR-B32 and the like, a K prefilter and an RLB loudness algorithm are used for acquiring loudness parameters of input audio, and a QC algorithm is used for gradually adjusting gain according to the current input loudness parameters and gain parameters to approach the target loudness. And then the output loudness is ensured to be below the protection threshold through the limiter soft protection threshold, so that unexpected popping can be prevented, and the post-stage equipment is protected. When the input audio frequency is larger than the protection threshold, the module can immediately attenuate the output audio frequency to be below the threshold, and due to the adoption of the soft threshold design, the output audio frequency is ensured not to have amplitude limiting and noise stopping, and the sound is maximally and really restored. And finally, entering a Compressor & Expander audio Compressor or an audio Expander according to the loudness of the audio signal (the audio Compressor is used for starting the Compressor when the loudness of the input audio signal exceeds a critical threshold, and suppressing the volume so as to stabilize the overall volume, and the Compressor is used for stopping the action if the loudness of the audio signal falls below the critical threshold, so that the post-stage equipment is protected and the tone is adjusted.

This broadcasting system of automatic control loudness can be automatically according to predetermineeing the loudness arithmetic processing to the embedding audio frequency in the high definition digital signal through audio loudness controller 5, utilizes digital signal processing technique, carries out real-time loudness calculation to the embedding audio frequency of signal to carry out audio compression, expansion, amplitude limiting control, noise gate and gain adjustment to the loudness of audio frequency, thereby guarantee to broadcast the loudness of sound and keep stable, bring better experience for the user.

The foregoing are merely exemplary embodiments of the present invention, and no attempt is made to show structural details, features, or other details of the present invention in the form of a more detailed description, which is presented for the purpose of illustration only, the more detailed description being taken by way of example only, and the more detailed description being presented for the purpose of illustrating the principles of the invention as embodied in the form of a more complete and readily available computer-readable medium. It should be noted that, for those skilled in the art, without departing from the structure of the present invention, several modifications and improvements can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the applicability of the patent. The scope of the claims of the present application shall be determined by the contents of the claims, and the description of the embodiments and the like in the specification shall be used to explain the contents of the claims.

Claims (2)

1. A broadcasting system for automatically controlling loudness is characterized in that: the system comprises an input signal source, a plurality of broadcasting guide signal sources, a signal selector, an audio loudness controller, an encoder and a client, wherein the broadcasting guide signal sources are connected with the input end of the signal selector through a data transmission line, the broadcasting guide signal sources are in communication connection with the signal selector, the input signal sources are in communication connection with an optical receiver, the optical receiver is in communication connection with the input end of the signal selector through a data line, the signal selector is in communication connection with the audio loudness controller through a data line, the audio loudness controller is in communication connection with the encoder through a data line, and the encoder is in communication connection with the client through a data line.

2. The automatically controlled loudness playout system of claim 1, wherein: the audio loudness controller comprises an RS422 interface, an SDI input interface, a first SDI output interface and a second SDI output interface, the RS422 interface is connected with an external control panel, the SDI input interface is connected with the signal selector through a data line, and the first SDI output interface and the second SDI output interface are connected with the client through data lines.

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