Title:
DIGITAL DEMODULATOR
Document Type and Number:
WIPO Patent Application WO/1993/010596
Kind Code:
A1
Abstract:
A digital demodulator for frequency modulated, pulse-width modulated and other temporally modulated signals uses a sign detector (14) to determine zero-crossings of the modulated signal. The periods between zero-crossings are determined by at least one gate circuit (16, 18) and at least one counter (22, 24) which counts clock pulses from a high-speed clock (20) gated by the gate circuit in response to zero-crossings. The period information is converted to a demodulated signal by a numerical processor (12), or a signal processor (12') or a digital-to-analog converter (12'').
Inventors:
HEDSTROM MARK D (US)
PORTER ROBERT B (US)
CREGO CHARLES R (US)
PORTER ROBERT B (US)
CREGO CHARLES R (US)
Application Number:
PCT/US1992/009857
Publication Date:
May 27, 1993
Filing Date:
November 17, 1992
Export Citation:
Assignee:
NSI PARTNERS (US)
International Classes:
H03M1/86; H03D3/00; H03D3/04; H03K9/06; H03K9/08; H04L27/14; (IPC1-7): H03D3/00
Foreign References:
| US4596022A | 1986-06-17 | |||
| US4412339A | 1983-10-25 | |||
| US4696018A | 1987-09-22 | |||
| US4707666A | 1987-11-17 | |||
| US4992748A | 1991-02-12 |
Other References:
See also references of EP 0613595A4
Attorney, Agent or Firm:
Schurgin, Stanley M. (Schurgin, Gagnebin & Hayes, Ten Post
Office Square, Boston, MA, US)
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