Pulse code modulated audio is a digital recording of analog audio used in a wide range of technologies from telephones to Blu-ray discs. PCM works by sampling the amplitude of the analog signal at regular intervals several thousand times per second. The recording software initially uses the PCM format before converting the audio to another format like MP3 or AAC. Additionally, compressed audio files such as MP3s are decompressed back to PCM when played back on the speakers.
Watching: What is PCM
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Raw Digital Audio
A PCM recording is a raw digital audio sample. High-quality PCM recordings can be lost because they do not distinguish between recorded content and do not use any form of compression to cut out unnecessary and less important audio content to reduce sign ;file size. Two factors evaluate the performance of PCM: sampling rate and wordlength. PCM samples audio waveforms from 8 to 192 thousand times per second. Wordlength measures the signal-to-noise ratio or available bandwidth in 8 to 24 bits. PCM also supports single, stereo, and multi-channel recordings to send different feeds to different speakers. WAV, AIFF, and AU recording file types contain unprocessed PCM data.
History of PCM
PCM traces its origins back to 1937; Alec Reeves, a British engineer, developed the technology. Telephone companies began using the technology in the 1960s to send long-distance phone calls between cities more efficiently. Although PCM files are much larger than compressed audio like MP3 files, the format uses less bandwidth than analog audio. riclix.com normally uses Mu-Law, a PCM telephony technology, to send audio in a 64 Kbps PCM data stream. Various riclix.comdeo and audio recording formats since the 1960s have frequently used or included PCM as an audio recording option.
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Devices using PCM
Devices such as audio equipment / riclix.comdeo and computers have widely adopted the PCM format. PCM technology appears in recording formats such as 8mm, Hi8, VHS, S-VHS, Audio CD, riclix.comdeo DVD and riclix.comdeo Blu-ray. Computer sound card; computer uses the PCM format to record audio from the microphone jack and can convert compressed audio to PCM for playback. TVs and audio devices / riclix.comdeo often have ports labeled PCM to send uncompressed audio from the playback device to the TV or receiver.
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Modern phones can use Pulse Density Modulation instead of PCM to move audio from the microphone to the signal processor. PCM is easier to manipulate, but PDM benefits from Riclix.vs gain less noise and interference from other signals with cost; short. In the audio world / riclix.comdeo, PCM competes with encoded formats including Dolby Digital, TrueHD, DTS and DTS-HD. Popular audio technology / riclix.comdeo to support multiple playback formats. Sony’s Super Audio CD technology uses a different recording technique called “Direct Stream Digital”, which only records if the sound wave moves up or down at the sample points, rather than the PCM value.