FSK data receiving system

Pulse or digital communications – Receivers – Angle modulation

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Details

375272, 329302, 331179, 455208, H03D 300

Patent

active

054147360

ABSTRACT:
An FSK data receiving system is provided which is capable of constituting a direct-conversion receiver suitable for realizing an integrated circuit, is capable of decoding in a wide receiving band width, and is capable of realizing a small-sized and less-electric power consumption data receiving. An FSK-modulated local oscillator signal 3 is applied to a local oscillator 2, and there is provided a decode circuit 15 which obtains the decode signal 14 by judging whether the FSK-modulated frequency deviation of the carrier wave signal 1 is a positive deviation or a negative deviation on the basis of a comparison result of a voltage change in a frequency-voltage conversion circuit 16 for a base-band signal 8; i.e. the output signal of a frequency mixer 6. An offset amount of the local oscillator frequency is judged by a voltage judging circuit 17 to produce a control signal 18 Further, there is provided another decode circuit 22 which makes a judgement of frequency change of the base-band signal 8 and a judgement of in-phase/opposite-phase relationship from the decode signal 14 and the output of the voltage judging circuit 17 so as to obtain a decode signal 23. Moreover, there is provided a decode signal processing circuit 25 which obtains a decode signal 24 from the decode signals 14, 23 in response to the control signal 18.

REFERENCES:
patent: 4462107 (1984-07-01), Vance
patent: 4523324 (1985-06-01), Marshall
patent: 4628518 (1986-12-01), Chadwick et al.
patent: 4669094 (1987-05-01), Van Rumpt
patent: 4672636 (1987-06-01), Marshall et al.
"Performance of Direct Conversion PSK Receiver" by Kohji Chiba et al.; Electronics Information Communication Institution; Spring; 1987; pp. 10-110.

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