Method of and device for demodulating biphase modulated signal

Details Method of and device for demodulating biphase modulated signal Method of and device for demodulating biphase modulated signal

1991-08-01

1992-12-29

Grimm, Siegfried H.

Demodulators

Phase shift keying or quadrature amplitude demodulator

375 80, 375 87, H04L 2720

Patent

active

051755076

ABSTRACT:
A method of demodulating a biphase modulated signal is implemented by first establishing a reference phase angle level. The biphase modulated signal contains a series of bits, each bit having first and second half-bits. The half-bits are represented by opposite phase angle levels. First and second phase angle levels correspond to the first and second half-bits respectively. After the levels associated with first and second half-bits are measured, the two levels are compared. A binary value is assigned to each pair of first and second half-bits based on the relationship of their respective levels. For example, a high phase angle level followed by a low level, can represent the binary value "1", and vice versa.

REFERENCES:
patent: 3514706 (1970-05-01), Dupraz et al.
patent: 4763338 (1988-08-01), Barndt, Sr.
patent: 5001728 (1991-03-01), Fuldner
European Broadcasting Union, "Specifications of the Radio Data System RDS for VHF/FM Sound Broadcasting", Mar. 1984, pp. 5-10, 58.

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