Vestigial sideband modulator for a baseband input signal

Details Vestigial sideband modulator for a baseband input signal Vestigial sideband modulator for a baseband input signal

1992-04-07

1993-09-07

Mis, David

Modulators

Amplitude modulator

Single or vestigial sideband type

332151, 375 61, 455102, 455109, H03C 100

Patent

active

052433048

ABSTRACT:
In a vestigial sideband modulator, an i.f. signal is modulated with a video input and the extreme part of one of the sidebands is removed to provide the right frequency response shape for transmission. The signal for transmission is usually produced by mixing the i.f. signal with an oscillator signal known as the heterodyne signal which differs from the desired carrier frequency by the i.f. frequency, and filtering the signal with a subsequent channel filter to remove any unwanted heterodyne oscillator components and the unwanted sum or difference product. To avoid the need for such a channel filter, the filtered video-modulated i.f. signal is demodulated to quadrature baseband components using the i.f. oscillator, and quadrature components at carrier frequency are modulated with these baseband components to produce on combination a v.s.b. modulated video output at carrier frequency.

REFERENCES:
patent: 3259692 (1966-07-01), Aspinwall
patent: 4994769 (1991-02-01), Kishi
Tiefenthaler, "Digital modulation using the Hilbert transform", Electronic Engineering, Apr. 1987, pp. 71-80.

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