Cosine signal correction circuit

Details Cosine signal correction circuit Cosine signal correction circuit

1982-09-30

1985-04-02

Smith, Jerry

Boots, shoes, and leggings

364851, 455202, H03K 3023

Patent

active

045091358

ABSTRACT:
A cosine signal corrector circuit as for use in a decoder for a system wherein an information signal is transmitted in the form of one trigonometric transform function of that signal. The second trigonometric transform function signal, required for decoding the information signal, required for decoding the information signal, is obtained by first deriving the Hilbert transform of the transmitted signal and phase inverting it, producing an approximate second transform function signal. The decoder produces the sum of the squares of the two transform function signals, and the difference between that decoder output and 1.0 is an "error" signal. Under the control of the signum signal of the approximate second transform function signal, the error signal is added to the approximate second transform function signal to produce an accurate second transform function signal. Even if the first transform function signal and its Hilbert transform approach zero at the same time, the circuit provides the correct polarity for the error signal.

REFERENCES:
patent: 3300720 (1967-01-01), Kowols
patent: 3800131 (1974-03-01), White
patent: 4303837 (1981-12-01), Ansaldi et al.
patent: 4397039 (1983-08-01), McAuliffe
patent: 4430620 (1984-02-01), Fisher et al.

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