Title:
AUTOMATIC FREQUENCY CONTROL CIRCUIT
Document Type and Number:
Japanese Patent JP2755210
Kind Code:
B2
Abstract:
PURPOSE: To provide an automatic frequency control circuit capable of preventing the occurrence of malfunction even at the time of moving the circuit.
CONSTITUTION: A quadrature demodulation part 1 orthogonally demodulates a received GMSK signal S1 and generates an in-phase signal I and a reverse phase signal Q and a conversion part 2 converts the signals I, Q ad an electric field intensity signal RSSI into digital signals and outputs the digital signals to a quality judging part 3. The judging part 3 judges the signal quality of the signal S1 based upon the signals I, Q, RSSI and generates an AFC data signal S3 indicating a correction value corresponding to the signal quality. Then the conversion part 2 converts the signal S3 into an analog signal and the frequency of the signal S1 is corrected based upon the correction value of the signal S3.
More Like This:
| WO/1993/012578 | APPARATUS AND METHOD FOR DIRECT PHASE DIGITIZING |
| WO/1996/011527 | QUADRATURE SAMPLING SYSTEM AND HYBRID EQUALIZER |
Inventors:
MYASHITA TOSHIICHI
Application Number:
JP11004095A
Publication Date:
May 20, 1998
Filing Date:
April 11, 1995
Export Citation:
Assignee:
NIPPON DENKI KK
International Classes:
H03D3/00; H03J7/02; H04N5/50; H04L27/14; H04L27/227; H04N5/60; H03D7/16; H04L27/00; (IPC1-7): H03J7/02; H04L27/14; H04N5/50; H04N5/60
Domestic Patent References:
| JP4264851A | ||||
| JP5308385A | ||||
| JP63290437A | ||||
| JP4345246A | ||||
| JP189833A | ||||
| JP63169856A |
Attorney, Agent or Firm:
Kihei Watanabe
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