Title:
INFRARED RAY RECEIVER
Document Type and Number:
Japanese Patent JP3820631
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To reduce the scale of a circuit in which any signals modulated with a plurality of subcarrier frequencies is received, the received modulated signal is converted into a prescribed subcarrier frequency, the converted frequency is fed to a post-stage demodulation circuit for demodulation processing and to decrease the cost.
SOLUTION: The center frequency of variable band pass filters 2, 6 and an oscillated frequency of an oscillator 10 are automatically varied with a frequency control signal S outputted from a frequency discrimination device 11 so as to extract a modulated wave signal with a prescribed subcarrier frequency and multipliers 3, 7 output a modulated wave signal of the subcarrier frequencies of 2.3MHz and 2.8MHz. Thus, the transmission signal by a plurality of subcarrier frequencies is received/demodulated by one system of reception demodulation circuit system corresponding to the audio signals of L and R channels.
Inventors:
Hiroyuki Kawashima
Yuji Okumura
Seiko Imai
Yuji Okumura
Seiko Imai
Application Number:
JP16515796A
Publication Date:
September 13, 2006
Filing Date:
June 06, 1996
Export Citation:
Assignee:
ソニー株式会社
International Classes:
H04B10/11; H03J7/02; H04B10/07; H04B10/516; H04B10/61; (IPC1-7): H04B10/152; H04B10/142; H04B10/04; H04B10/06; H03J7/02; H04B10/105; H04B10/10; H04B10/22
Domestic Patent References:
| JP6303215A | ||||
| JP6245266A | ||||
| JP8126073A | ||||
| JP5244158A |
Attorney, Agent or Firm:
Atsuo Waki
Nobuo Suzuki
Nobuo Suzuki
Previous Patent: OXYGEN REFINING DEVICE
Next Patent: GUTTER COVER FOR U-SHAPED GUTTER BLOCK TO BE CONTINUOUSLY PROVIDED
Next Patent: GUTTER COVER FOR U-SHAPED GUTTER BLOCK TO BE CONTINUOUSLY PROVIDED