TRANSMITTER

Japanese Patent JP3008651

B2

PURPOSE: To provide the transmission reception system in which a problem that a transmission information quantity cannot be increased is solved when the frequency band is limited in the transmitter sending a digital signal and much more information is sent within the same frequency band.
CONSTITUTION: The transmitter 1 uses a modulator 4 implementing m-value QAM modulation to allocate data of n-value of a 1st data string to a signal point group formed by grouping signal points on a signal space diagram comprising the 1st data string of n-value and 2nd and 3rd data strings of p-value and to send the modified m-value QAM modulation signal. A 1st receiver 23 uses a demodulator 25 to demodulate the 1st data string of n-value, a 2nd receiver 33 demodulates the 1st data string and the 2nd data string, and a 3rd receiver 43 demodulates the 1st data string, the end data string and the 3rd data string, and then even the receiver having only a demodulation capability of n-value in the case of n<m when the m-value modified multi-value modulation wave demodulates the data of the 1st data string of n-value in the transmitter.

Mitsuaki Ohshima

JP6893592A

February 14, 2000

March 27, 1992

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Matsushita Electric Industrial Co., Ltd

H04J3/00; H04J11/00; H04L1/00; H04L27/02; H04L27/18; H04L27/26; H04L27/34; H04L27/36; H04L27/38; H04N5/44; H04N7/015; H04N7/045; H04N7/20; H04N7/24; H04N7/54; H04N19/00; H04N19/42; H04N19/51; H04N19/625; H04N19/635; H04N19/65; H04N19/70; H04N19/80; H04N21/2383; H04N21/438; (IPC1-7): H04L27/36; H04J3/00; H04L27/38; H04N7/015; H04N7/20; H04N7/24

JP53137657A
JP53132927A
JP5147311A
JP6328145A
JP57159148A
JP5276211A
JP645135A
JP8506473A

【文献】“B-ISDNの総合映像サービスのための階層符号化”,1991年電子情報通信学会秋季大会,社団法人電子情報通信学会,1991年8月15日,B-330

Fumio Iwahashi (2 others)

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