What is PCM?
Pules-Code Modulation is one of the most common codecs used for recording audio as digital stream of binary data. PCM relied on a process called sampling to transform a continuous signal into a sequence of discrete measurements occurring at regular intervals. In digital recording, each sample is stored numerically as a binary string of zeros and ones.
The three variables that control the fidelity of a PCM:
- Sample Rate: Specifies the number of samples recorded every second.
- Bit Depth: Specifies the number of bits used to encode the value of each sample.
- Bit Rate: Specifies the number of bits per second transmitted during playback.
Fun Fact!
Since human hearing has a frequency range of 20Hz (Hertz) to 20 kHz, a minimum sample rate of 40kHz is required in order to effectively capture and encode all the frequencies within this range.
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