Stereophonic coder employing a multilevel switching system for t

Details Stereophonic coder employing a multilevel switching system for t Stereophonic coder employing a multilevel switching system for t

1979-01-24

1981-04-28

Olms, Douglas W.

Modulators

Amplitude modulator

Nonlinear device controlled by modulating signal

332 40, H04H 500

Patent

active

042647843

ABSTRACT:
In order to obtain a stereophonic coder, the levels of the signals S.sub.1, S.sub.2 relative to the two channels of a stereophonic system are modified and combined so as to generate a waveform in which the harmonics up to the 6th included have been suppressed; this is achieved by switching actions which occur at intervals of 1/8 f (f being the frequency of the subcarrier) and are such that a signal is obtained which in the successive intervals is proportional to: ##EQU1## then to the above values repeated in reverse order, then again to the values repeated in the direct order, and so on. The invention concerns also the coder performing such a process.

REFERENCES:
patent: 3711652 (1973-01-01), Metro
patent: 3789323 (1974-01-01), Andersen et al.
"FM Stereo: Time-Division Approach" by Eilers in Audio, Aug. 1961; pp. 20-22 and 96.

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