Receiving apparatus and decoder

Details Receiving apparatus and decoder Receiving apparatus and decoder

1997-10-27

1999-05-18

Ghebretinsae, Temesghen

Pulse or digital communications

Receivers

Angle modulation

329300, H04L27/14

Patent

active

059057637

ABSTRACT:
In an FSK receiving apparatus, a quadrature FSK-modulated signal is received at an I/F unit and demodulated, the state of the frequency eccentricity is detected at a comparator, and the signal as the result thereof is input to a decoder. In the decoder, a clock generation unit generates a sampling signal of a frequency of a predetermined number of times the rate of transfer of one bit of data under the control of a clock control unit, a shift register samples the signal output from the comparator based on this signal and successively records the bits of the sampling, and a data decision unit ignores bits of the sampling at the beginning and end and reads the remaining bits of the sampling at a point of time when one bit of data worth of bits of the sampling are stored, counts the number of bits of the value "1" in this, and decides that the bit of the transferred data is "1" when the count is at least a specific number while decides that the bit of the transferred data is "0" when it is less than the specific number, whereby correct decoding can be carried out even if the frequency is eccentric.

REFERENCES:
patent: 4486715 (1984-12-01), Maas et al.
patent: 4574247 (1986-03-01), Jacob

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