Title:
SIGNAL MULTIPLEX TRANSMISSION SYSTEM
Document Type and Number:
Japanese Patent JP2780630
Kind Code:
B2
Abstract:
PURPOSE: To form the signal multiplex transmission system in which an identification signal is sent in a time slot only used for sending a main signal with respect to the signal multiplex transmission system where an analog signal such as a voice signal is sent together with the identification signal.
CONSTITUTION: Analog voice signals A, B extracted from band pass filters 3a, 3b and 1st and 2nd reference voltages corresponding to identification signals IDA, IDB extracted from low pass filters 4a, 4b are respectively frequency- division-multiplexed respectively and the result is fed to a time division multiplex circuit 6 via A/D converters 5a, 5b. The obtained time division multiplex signal is sent to a transmission line 7. Thus, the voice signal A and the 1st reference voltage being the identification signal and the voice signal B and the 2nd reference voltage being the identification signal are in existence in a same time slot of the time division multiplex signal to be sent.
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Inventors:
Hiroshi Araki
Application Number:
JP2736194A
Publication Date:
July 30, 1998
Filing Date:
January 31, 1994
Export Citation:
Assignee:
NEC
International Classes:
H04J4/00; (IPC1-7): H04J4/00
Domestic Patent References:
| JP5276132A | ||||
| JP6370748U |
Attorney, Agent or Firm:
Matsuura