Title:
INTERPHONE SYSTEM
Document Type and Number:
Japanese Patent JP3835106
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To add a monitor function which does not accompany the voice output on the slave machine side with resembling even in the case that the base band transmission system is adopted for voice and the FM system is adopted for video.
SOLUTION: A master machine A1 is comprised of a carrier signal generation part 110 besides a multiplexing part 100, a power source part 101, a call detection part 102, a picture reception and demodulation part 103, a monitor TV part 104, a speaker amplifier part 105, a speaker part 106, a microphone part 107, a microphone amplifier part 108, and a power feeding part 109, and a slave machine B1 is comprised of a speaker amplifier power supply control part 210 besides a multiplexing part 200, a power reception part 201, a call control part 202, a camera part 203, a video modulation and transmission part 204, a microphone part 205, a microphone amplifier part 206, a speaker amplifier part 207, a speaker part 208 and a carrier signal detection part 209. The speaker amplifier power supply control part 210 keeps the voice output off till detection of a carrier signal after the change from the power feeding standby state to the operation power feeding state and turns on the voice output by detection of the carrier signal and turns off the voice output at the time of the change to the power feeding standby state.
Inventors:
Kazuyasu Yamane
Hideo Sakamoto
Tomohide Furuya
Naoki Umeda
Hideo Sakamoto
Tomohide Furuya
Naoki Umeda
Application Number:
JP2000056097A
Publication Date:
October 18, 2006
Filing Date:
March 01, 2000
Export Citation:
Assignee:
MATSUSHITA ELECTRIC WORKS,LTD.
International Classes:
H04M9/00; H04N7/18; (IPC1-7): H04M9/00; H04N7/18
Domestic Patent References:
| JP9046696A | ||||
| JP8097920A | ||||
| JP3278652A |
Attorney, Agent or Firm:
Keisei Nishikawa
Atsuo Mori
Atsuo Mori