Uniform discrete fourier transform filter parameter encoder

Details Uniform discrete fourier transform filter parameter encoder Uniform discrete fourier transform filter parameter encoder

1997-01-02

1999-02-09

Pham, Chi H.

Pulse or digital communications

Receivers

375204, 370210, H03K 900, H04L 2906

Patent

active

058704361

ABSTRACT:
The invention is embodied in a parameter encoder for identifying selected parameters of a digitally sampled incoming signal lying within a receiver bandwidth, wherein the receiver bandwidth is divided into plural contiguous frequency channels, each channel having a channel bandwidth, whereby the incoming signal is divided into plural channelized signals lying in respective ones of the plural frequency channels, the parameter encoder includes plural channel processors connected to receive respective ones of the channelized signals, each of the channel processors including Fourier transform apparatus for producing a frequency value and an amplitude value for each sample of the respective channelized signal. The parameter encoder embodying the invention further includes a channel arbitrator including comparator apparatus for comparing the amplitude value with a predetermined threshold, comparing the amplitude value with the corresponding amplitude values of adjacent ones of the channels and comparing the frequency value with corresponding frequency values of adjacent ones of the channels, and processor apparatus for sensing whether a detected signal lies in the respective channel based upon at least one of: (a) determination of a corresponding amplitudes values of the respective channel and its adjacent neighbor channels relative to the predetermined threshold, (b) determination of predominance of the frequency value over corresponding frequency values of adjacent neighbor channels, (c) determination of a difference between the frequency value and that of an adjacent neighbor channel exceeding a predetermined frequency threshold.

REFERENCES:
patent: 4893266 (1990-01-01), Deem
patent: 5323391 (1994-06-01), Harrison
patent: 5537435 (1996-07-01), Carney et al.
patent: 5602876 (1997-02-01), Noneman et al.

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