SSB digital modulator

Details SSB digital modulator SSB digital modulator

1990-05-09

1992-05-19

Shaw, Dale M.

Electrical audio signal processing systems and devices

One-way audio signal program distribution

Public address system

381 38, 36472417, 375 61, G10L 302

Patent

active

051154684

ABSTRACT:
A digital SSB modulator in which an analog signal such as a vocal signal is temporarily converted to a digital signal, which is then subjected to SSB modulation using digital phase shifters and digital orthogonal amplitude modulators, and the resulting signal is converted back to an analog modulated signal. A digital filter may be provided after each digital phase shifter for eliminating direct-current signal components. Another digital filter may be provided after each digital orthogonal amplitude modulator for eliminating carrier signal components.

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patent: 3212008 (1965-10-01), Kahn
patent: 3359496 (1967-12-01), Burnsweig et al.
patent: 3825834 (1974-07-01), Stuart et al.
patent: 3868601 (1975-02-01), MacAfee
patent: 4297533 (1981-10-01), Gander et al.
patent: 4302817 (1981-11-01), Labedz
patent: 4586174 (1986-04-01), Wong
Hirano et al., "Design of Digital Notch Filters", IEEE Trans. on Communications, vol. COM-22, No. 7, Jul. 1974, pp. 964-967.
Abu-el-Haija, "A Structure for Digital Notch Filters", IEEE Trans. on ASSP, vol. ASSP-27, No. 2, Apr. 1979, pp. 193-195.

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