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DAD 意为数字音频唱片,又称 PCM 唱片,是采用脉冲编码调制(PCM)方式实现的,它与模拟唱片有着本质的不同。模拟唱片上刻录的是模拟信号(信号的振幅随时间而变化)。在刻录、制版、压片过程中很容易将失真成份带入声迹。在放唱过程中,唱片与唱针磨损、拾音器失真、唱盘转动不平稳等均会造成音质恶化。而数字音频唱片上刻录的是脉冲编码调制(PCM)信号,它是以脉冲的有无(有脉冲为“1”,无脉冲为“0”)来表示音频信息的。上述模拟方式各个环节
DAD means digital audio record, also known as PCM record, is realized by Pulse Code Modulation (PCM), which is different from analog record. Analog recordings are recorded on analog recordings (the amplitude of the signal changes over time). In the burning, plate making, tabletting process is very easy to bring the distortion components into the soundtrack. In the singing process, the record and needle wear, pickup distortion, disc rotation is not stable, etc. will result in deterioration of sound quality. Digital audio recording on the pulse-code modulation (PCM) signal, which is based on whether the pulse (pulse “1”, no pulse “0”) to represent the audio information. The simulation of all aspects