Title:
SIGNAL TRANSMISSION METHOD AND DEVICE BY USING COMPRESSION ELONGATION TECHNIQUE
Document Type and Number:
Japanese Patent JPH02119442
Kind Code:
A
Abstract:
PURPOSE: To transmit any decoding waveform digital data by shifting the center frequency of either one of a prescribed frequency band and a control tone band thereby preventing overlapping of both bands. CONSTITUTION: A mixer 100 is used for shifting the frequency of input data frequency spectrum, which is shifted up to high frequency Fc by frequency shift so as not to generate overlapping between an input data band and an envelope signal frequency band. Thereby an oscillator 102 supplies mixed frequency Fosc to a frequency multiplexer, i.e., a mixer 104 and the mixed frequency Fosc is mixed with input data A to generate mixed data B. Consequently any decoded waveform digital data can be transmitted.
Inventors:
JIEIMUZU HAWAADO REBETSUKU
Application Number:
JP23832789A
Publication Date:
May 07, 1990
Filing Date:
September 12, 1989
Export Citation:
Assignee:
EE M EE F IND INC
International Classes:
H04L27/02; H04B1/64; H04B14/00; (IPC1-7): H04B14/00; H04L27/02
Domestic Patent References:
| JP51058607B | ||||
| JPS5147002A | 1976-04-22 | |||
| JPS4948217A | 1974-05-10 | |||
| JPS5730426A | 1982-02-18 | |||
| JPS5146010A | 1976-04-20 | |||
| JPS4911507A | 1974-02-01 | |||
| JPS5713824A | 1982-01-23 |
Foreign References:
| US4271499A | 1981-06-02 |
Attorney, Agent or Firm:
Motohiko Fujimura