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A prototype for five-channel surround sound, then dubbed "quintaphonic sound", was used in the 1975 film Tommy. [6]5.1 dates back to 1976, [7] when Dolby Labs modified the track usage of the six analogue magnetic soundtracks on Todd-AO 70 mm film prints.
Different bit depth/sampling rate/channel combinations can be used on a single disc. For instance, a DVD-Audio disc may contain a 96 kHz/24-bit 5.1-channel audio track as well as a 192 kHz/24-bit stereo audio track. Also, the channels of a track can be split into two groups stored at different resolutions.
Audio stereo power amplifier made by McIntosh The internal view of a Mission Cyrus 1 Hi Fi integrated audio amplifier (1984) [1]. An audio power amplifier (or power amp) amplifies low-power electronic audio signals, such as the signal from a radio receiver or an electric guitar pickup, to a level that is high enough for driving loudspeakers or headphones.
The audio system requires at least a stereo power amplifier and two speakers, for stereo sound; most systems have multi-channel surround sound power amplifier and six or more speakers (a 5.1 surround sound system has left and right front speakers, a centre speaker, left and right rear speakers and a low-frequency subwoofer speaker enclosure ...
Stereo amplifiers imply two channels of output (left and right), though the term simply means "solid" sound (referring to three-dimensional)—so quadraphonic stereo was used for amplifiers with four channels. 5.1 and 7.1 systems refer to Home theatre systems with 5 or 7 normal spatial channels, plus a subwoofer channel. Buffer amplifiers ...
Channel number 3 0–3 Sampling frequency: 0000 2: 44.1 kHz, 0100 2: 48 kHz, 1100 2: 32 kHz 4–5 Clock accuracy: 10 2: 50ppm, 00 2: 1100ppm, 01 2: variable pitch (requires compatible receiver) 6–7 Undefined 4 0 Word length 20 bits Word length 24 bits 1–3 Sample length (0: undefined, 1–4: word length minus 1-4 bits, 5: full word length) 4–7