subchanneln.
/ˈsʌbˌtʃanl/, U.S. /ˈsəbˌtʃæn(ə)l/ 1. A secondary or minor channel of a river, stream, etc.; a subsidiary channel conveying water.
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society > communication > telecommunication > [noun] > signal > frequency or band of frequencies > channel
subchannel1825
channel1923
voice channel1924
1825 tr. C. Dupin Commerc. Power Great Brit. II. iv. v. 235 The water filtering through these strata falls into the sub-channels, which, by a well-adapted inclination, convey it to the reservoir of purified water.
1887 Overland Monthly June 622/2 Open ditches, water distributed over the fields by sub-channels.
1956 Geografiska Annaler 38 204 A system of sub-channels that diverge and converge again is formed—a braided river.
1992 Cambr. Encycl. Human Evol. (1994) v. iv. 187/2 Sands and gravels are found in the deposits left by an active river channel or subchannels.
2. Telecommunications. A distinct division of a channel or frequency band. Cf. channel n.1 17a.
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1934 U.S. Patent 1,963,238 3/1 To receive any desired sub-channel, the heterodyne oscillator is tuned to provide a 2200 cycle beat with the desired sub-channel.
1959 Wall St. Jrnl. 30 June 1/4 Multiplexing…is a technique by which a radio station can divide its regular channels into subchannels and transmit two or more sound signals at the same time.
1970 J. Earl How to choose Tuners & Amplifiers i. 24 A low-pass filter for reducing the stereo sub-channel noise when the aerial signal is not quite strong enough for noise-free stereo reception.
2010 Daily Variety (Nexis) 10 Nov. 12 Some affiliates are carving up their spectrum into subchannels and using it to provide other services.
This entry has been updated (OED Third Edition, June 2012; most recently modified version published online March 2022).
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n.1825