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.
1.1 FM 1.2 AM
2.1 NTSC 2.2 PAL 2.3 SECAM
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.
There are several methods in AM, including Motorola's C-QUAM, and Leonard Kahn's independent sideband.
The main audio is on a separate carrier, but the stereo difference is a subcarrier of the video carrier. See multichannel television sound.
