Title:
MODEM, IMAGE COMMUNICATION DEVICE, AND COMMUNICATION CONTROL METHOD
Document Type and Number:
Japanese Patent JP3409014
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To precisely identify control signals exchanged through control channels.
SOLUTION: In starting the half duplex communication, pursuant to Recommendation V.34 through control channels, this system acquires the coordinate in the signal space diagram by demodulating the received symbols that were demodulated in crossing amplitude, calculates the products of two vectors from the origin to the respective coordinates regarding two consecutive symbols to see the polarity, and identifies the control signal based on the polarity pattern of consecutive symbols obtained from the calculation.
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Inventors:
Nobuhiko Noma
Application Number:
JP2000099562A
Publication Date:
May 19, 2003
Filing Date:
March 31, 2000
Export Citation:
Assignee:
Panasonic Communications Co., Ltd.
International Classes:
H04N1/32; H04L27/38; (IPC1-7): H04L27/38; H04N1/32
Domestic Patent References:
| JP200022770A | ||||
| JP9130435A | ||||
| JP9130441A |
Attorney, Agent or Firm:
Koichi Washida