Abbreviation for Pulse Code Modulation. A method for encoding and decoding analog audio data, used in music CDs and WAV files. An analog signal is sampled at regular intervals, quantized, and converted into a digital signal. PCM is expressed by the sampling frequency (unit: kHz) and the number of quantization bits (unit: bits). The higher the value, the better the quality. A device that plays PCM is called a PCM sound source. Source: ASCII.jp Digital Dictionary About ASCII.jp Digital Dictionary Information |
パルス符号変調の略。アナログの音声データを符号化、復号化する方式のひとつで、音楽CDやWAVファイルなどで利用されている。アナログ信号の音を一定時間ごとにサンプリングし、量子化してデジタル信号化したもの。PCMは、標本化周波数(単位kHz)、量子化ビット数(単位bits)で表される。それぞれ数値が大きいほど、品質がよい。PCMを再生する装置をPCM音源と呼ぶ。
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