论文部分内容阅读
数字音频信号的取样频率规定为三种,32kHz,44.1kHz和48kHz。三种取样频率各用于不同的场合,CD使用的取样频率为44.1kHz,卫星音频数字广播的取样频率有两种,A模式为32kHz、B模式为48kHz。数字录音机采用的取样频率为48kHz或32kHz。由于数字音频信号的取样频率不同,在有的场合必须对数字音频信号的取样频率加以变换,例如想将CD重放的数字信号录入到数字录音机的磁带上,就必须作取样频率变换。取样频率变换是在数字信号领域中进行
The sampling frequency of the digital audio signal is stipulated as three kinds, 32kHz, 44.1kHz and 48kHz. The three sampling frequencies are used for different occasions. The sampling frequency used by the CD is 44.1 kHz. There are two sampling frequencies for satellite audio digital broadcasting. The A sampling rate is 32 kHz and the B sampling rate is 48 kHz. The digital recorder uses a sampling frequency of 48kHz or 32kHz. Due to the different sampling frequencies of digital audio signals, the sampling frequency of digital audio signals must be changed in some cases. For example, when digital signals of CD playback are recorded on the tape of digital audio recorder, the sampling frequency must be changed. Sampling frequency conversion is carried out in the field of digital signals