Title:
FREQUENCY COUNTING CIRCUIT
Document Type and Number:
Japanese Patent JPH11234353
Kind Code:
A
Abstract:
To provide a frequency counting circuit capable of more accurately measuring the frequency of modulated IF signals.
By counting the radio of 1/0 of data demodulated by a demodulation circuit (a) coincidentally with the counting of an IF pulse number, the error amount of the IF pulse number within fixed time is measured. This frequency counting circuit uses the measured error amount, corrects an IF count number by a correction circuit (e) and measures an IF frequency. An accurate IF frequency value is obtained without being affected by a count error by modulation.
Inventors:
GOSHIMA TATSUHIRO
MATSUGAKI ISAO
HARADA HIROSHI
MATSUGAKI ISAO
HARADA HIROSHI
Application Number:
JP3246198A
Publication Date:
August 27, 1999
Filing Date:
February 16, 1998
Export Citation:
Assignee:
MATSUSHITA ELECTRIC IND CO LTD
International Classes:
H03K21/02; H03K21/40; H04L27/18; (IPC1-7): H04L27/18; H03K21/02; H03K21/40
Attorney, Agent or Firm:
Tomoyuki Takimoto (1 person outside)