Title:
FM MULTIPLEX DEMODULATOR
Document Type and Number:
Japanese Patent JP3837008
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide an FM multiplex demodulator that can keep a stereophonic sense and reduce an offensive sound noise to ears.
SOLUTION: The FM multiplex demodulator is provided with a filter that separates a signal multiplexed by using a 38 kHz sub carrier from an FM detected signal, a ratio change section that changes a synthesis ratio between an output signal from the filter and the FM-detected signal and provides an output of the result, a noise detection section that detects a noise from the FM-detected signal and changes the synthesis ratio of the ratio change section corresponding to the detected noise, a demodulation section that multiplies the subcarrier with the output signal from the ratio change section to demodulate a multiplexed signal, an adder section that sums the FM-detected signal and an output signal from the demodulation section, and a subtractor section that subtracts the output signal of the demodulation section from the FM-detected signal.
Inventors:
Yuji Yamamoto
Application Number:
JP2000099767A
Publication Date:
October 25, 2006
Filing Date:
March 31, 2000
Export Citation:
Assignee:
Pioneer Corporation
International Classes:
H04L27/144; H04B1/16; H04H40/45; H04H40/63; H04H1/00; (IPC1-7): H04H5/00; H04L27/144
Domestic Patent References:
| JP3179828A | ||||
| JP51115706A | ||||
| JP2206230A | ||||
| JP60019336A | ||||
| JP6315016A | ||||
| JP7023010A | ||||
| JP6224866A | ||||
| JP6350466A | ||||
| JP8023317A | ||||
| JP2000332710A |
Attorney, Agent or Firm:
Hideo Takino