Modulation and demodulation of plural channels using analog and

Details Modulation and demodulation of plural channels using analog and Modulation and demodulation of plural channels using analog and

1994-03-01

1995-08-22

Grimm, Siegfried H.

Demodulators

Frequency shift keying or minimum shift keying demodulator

Input signal combined with local oscillator or carrier...

329303, 332101, 327106, 375274, 375305, 375328, 375336, H03B 100, H04L 2712, H04L 2714

Patent

active

054444152

ABSTRACT:
In the modulation and demodulation of a plurality of frequency separated channels on a radio frequency carrier by digitally coded speech or data, the speech or data is modulated on a digitally generated sub-carrier by quadrature phase shift keying and after conversion to analogue form the modulated sub-carrier is mixed with an RF carrier of fixed frequency to produce the signal for transmission. Reception and demodulation of the transmitted signal are effected by the reverse processes. Frequency multiplication is effected after the digital to analogue conversion by producing analogue samples of very short duration and applying them to a suitable filter. Frequency division during the analogue to digital conversion is effected by sub-sampling.

REFERENCES:
patent: 3783385 (1974-01-01), Dunn et al.
patent: 3824498 (1974-07-01), McBride
patent: 5084681 (1992-01-01), Kovalick et al.

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