Data demodulator device

Details Data demodulator device Data demodulator device

1997-04-21

2000-09-12

Ghebretinsae, Temesghen

Pulse or digital communications

Receivers

Particular pulse demodulator or detector

375324, 329304, H04L 2706

Patent

active

06118831&

ABSTRACT:
An RDS signal is binarized by a comparator (2) and the output is sampled by a regeneration clock in synchronism with a regeneration carrier to provide sampled data. Then, by means of an accumulator (an adder 6 and a D-FF7) or a low pass filter (12), an integration result of the sampled output is obtained for each biphase symbol and by means of a biphase decoder circuit (9), the integration results are subjected to a subtraction between two symbols making up a pair. A differentially coded RDS data can be obtained using the sign of the subtraction result, which is differentially decoded in a differential decoder circuit (11) to provide an RDS data. In addition, the absolute value of the subtraction result is compared with a predetermined threshold value to provide reliability data for each differentially coded RDS data using the comparison result. The lower one of the consecutive reliability data may be assumed to be the reliability data for the RDS data.

REFERENCES:
patent: 5436591 (1995-07-01), Henze
patent: 5777511 (1998-07-01), Masumoto et al.

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