This standard specifies the basic technical requirements for digital sound signal source coding. This standard applies to digital sound signal source coding in radio stations, television studios, recording studios and similar studios. This standard can be used as a technical basis for the design, production and management of digital sound equipment for radio and television. GB/T 14919-1994 Technical Specification for Digital Sound Signal Source Coding GB/T14919-1994 Standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
GB/T14919—1994
Technical Specifications for Digital Audio Source Coding
The specifications for digital audio source codingPublished on 1994-01-26bZxz.net
State Administration of Technical Supervision
Implementation on 1994-09-01
National Standard of the People's Republic of China
Technical Specifications for Digital Audio Source Coding
The specifications for digital audio source codingThis standard is equivalent to the CCIR646 Recommendation "Digital Audio Source Coding for Broadcasting Studios". 1 Subject Content and Scope of Application
This standard specifies the basic technical requirements for digital audio source coding. GB/T14919—1994
This standard applies to digital audio source coding for radio stations, television studios, recording studios and similar studios and recording studios. This standard can be used as a technical basis for the design, production and management of digital audio equipment for radio and television. 2 Terminology
2.1 Digital signaldigital signal
A signal that uses a finite number of digits to represent a continuously changing physical quantity2.2 Samplingsampling
The discrete value of a continuous variable obtained at equal or arbitrary time intervals. 2.3 Sampling frequencysamplingfrequencyThe frequency at which a physical quantity is sampled, that is, the number of samples per unit time. 2.4 Quantization
The sampling value of an analog signal is represented by a set of finite numbers of levels. 2.5 PCM codingPCM coding
Sampling and quantizing analog data signals, and representing binary numbers as pulse sequences. 3 Technical content
3.1 In various applications in broadcast studios, including digital coding of recorded sound signals, the sampling frequency value is 48kHz. 3.2 In television applications, the digital coding of sound signals also has a sampling value of 48kHz. 3.3 When a digital audio device works independently, the maximum error of its internal sampling frequency is ±1X10-5. 3.4 In various applications of sound broadcasting and television, when digital audio devices are interconnected, measures must be taken to lock their internal sampling frequency clock with external sampling frequency (such as television synchronization signal, main clock of broadcast main control room, high-precision clock in telecommunication network). 3.5 The encoding method used is at least equivalent to PCM16bit uniform accuracy. 3.6 No pre-emphasis network is used.
Approved by the State Administration of Technical Supervision on January 26, 1994 and implemented on September 1, 1994
Additional Notes:
GB/T14919
9—1994
This standard is proposed by the Ministry of Radio, Film and Television of the People's Republic of China. The Standardization Planning Institute of the Ministry of Radio, Film and Television is responsible for the technical coordination of this standard. This standard is drafted by the Broadcasting Science Research Institute of the Ministry of Radio, Film and Television. The main drafters of this standard are Zou Feng, Liu Baohua and Ling Sanhua.
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