Digital filtering, data rate conversion and modem design

Details Digital filtering, data rate conversion and modem design Digital filtering, data rate conversion and modem design

1994-01-28

1996-03-19

Chin, Stephen

Pulse or digital communications

Equalizers

Automatic

375350, 3647241, H03H 730, H03H 740

Patent

active

055008747

ABSTRACT:
A digital filter 23 receives a control signal which specifies what filter coefficient values should be used. The control signal can be changed repeatedly so as to dynamically select the coefficients in response to the value of a control parameter. The filter 23 can be configured as a data rate converting filter in which the control signal represents the current phase relationship between the input data stream and the output data stream. The phase control signal can be provided as the phase output of a numerically controlled oscillator 67 having an oscillation frequency which is a multiple of one of the data rates and which is clocked at a multiple of the frequency of the other data rate. The data rate converter can be used as part of a data modulator or demodulator, thereby allowing an analog-to-digital converter 19 or a digital-to-analog converter 143 of the modulator or demodulator to run at a fixed arbitrary frequency substantially regardless of the data rate of modulated symbols.

REFERENCES:
patent: 4021738 (1977-05-01), Gitlin et al.
patent: 4599732 (1986-07-01), LeFever
patent: 4856030 (1989-08-01), Batzer et al.
patent: 4953184 (1990-08-01), Simone
patent: 5311546 (1994-05-01), Paik et al.
Sampleport Stereo Asynchronous Sample Rate Converters, AD1890/AD1891, Analog Devices, pp. 1-20.

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