Science Fair Project Encyclopedia
Stereo generator
A stereo generator is an electronic device designed to encode stereophonic information for transmission over radio or television. It generally only refers to analog audio.
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Radio
FM
FM stereo uses a double-sideband suppressed carrier (DSSC or DSB-SC) on a 38kHz subcarrier. This carries the "left minus right" (stereo difference) signal, while the baseband audio is the monophonic "left plus right" (stereo sum).
The old Soviet system uses polar modulation .
AM
There are several methods in AM, including Motorola's C-QUAM, and Leonard Kahn 's independent sideband.
Televsion
NTSC
The main audio is on a separate carrier, but the stereo difference is a subcarrier of the video carrier. See multichannel television sound.
PAL
SECAM
10-26-2009 08:16:03
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The contents of this article is licensed from www.wikipedia.org under the GNU Free Documentation License. Click here to see the transparent copy and copyright details