Homodyne down-converter with digital Hilbert transform filtering

Details Homodyne down-converter with digital Hilbert transform filtering Homodyne down-converter with digital Hilbert transform filtering

1989-03-10

1990-02-20

LaRoche, Eugene R.

Demodulators

Frequency modulation demodulator

Input signal converted to and processed in pulse form

375102, 455311, H03D 300

Patent

active

049029797

ABSTRACT:
A homodyne down-converter, for use in an IF signal demodulator and the like, includes an analog-to-digital converter (ADC) which receives the IF analog signal for conversion to a digital data stream by sampling at a sampling rate frequency substantially equal to four times the IF signal frequency. A digital mixer controllably inverts the sampled data to convert the data to baseband, before a circuit removes the effects of DC offset in the analog IF signal applied to the ADC. A discrete Hilbert Transform filter is used for generating streams of sequential in-phase I' and quadrature-phase Q' data words, which are resampled to temporally align the two data word streams at a new data rate, thus effectively removing sample offset without the need for separate misalignment correction circuitry.

REFERENCES:
patent: 4647864 (1987-03-01), Rafferty et al.
patent: 4755761 (1988-07-01), Ray, Jr.
patent: 4814715 (1989-03-01), Kasperkovitz
"Discrete Hilbert Transform Filters", R. L. Lavallee, M.S. Thesis, Syracuse University, 1971.

Affiliated with

Also associated with

Rating

Homodyne down-converter with digital Hilbert transform filtering does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Homodyne down-converter with digital Hilbert transform filtering, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Homodyne down-converter with digital Hilbert transform filtering will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1618439