Method and system for reducing the sampling rate of a signal for

Details Method and system for reducing the sampling rate of a signal for Method and system for reducing the sampling rate of a signal for

1998-03-02

2000-07-04

Nguyen, Lee

Telecommunications

Receiver or analog modulated signal frequency converter

Frequency or phase modulation

455 23, 375322, H04B 116

Patent

active

060850736

ABSTRACT:
A method and system for reducing the sampling rate of a signal for use with high modulation index frequency modulated signals reduces the power consumption and processing requirements of the digital signal processing equipment which performs the demodulation. In a preferred embodiment, a high modulation index FM signal is divided into in-phase and quadrature phase components by a downconverter (FIG. 1, 10). These components are sampled by analog to digital converters (20, 21) and input to a delay element (40, 41). The resulting delayed and undelayed samples are conveyed to downsamplers (60-63) where the sampling rate is reduced. The undelayed in-phase and delayed quadrature phase components are multiplied together by a first multiplier (70) while the undelayed quadrature phase and delayed in-phase components are multiplied together by a second multiplier (71). The output of the second multiplier (71) is then subtracted from the output of the first multiplier (70) by a subtractor (80) which outputs baseband audio or data.

REFERENCES:
patent: 4361875 (1982-11-01), Hertz et al.
patent: 5614862 (1997-03-01), Sun
patent: 5631969 (1997-05-01), Hanson

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