JPS5623074A - Modulator for facsimile - Google Patents
Modulator for facsimileInfo
- Publication number
- JPS5623074A JPS5623074A JP9846079A JP9846079A JPS5623074A JP S5623074 A JPS5623074 A JP S5623074A JP 9846079 A JP9846079 A JP 9846079A JP 9846079 A JP9846079 A JP 9846079A JP S5623074 A JPS5623074 A JP S5623074A
- Authority
- JP
- Japan
- Prior art keywords
- waveform
- signal
- circuit
- supplied
- waveforms
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/41—Bandwidth or redundancy reduction
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Facsimile Image Signal Circuits (AREA)
Abstract
PURPOSE:To realize a high-degree band compression by forming the modulation signal via the signal whose polarity is reversed with every minimum and maximum points of the facsimile signal. CONSTITUTION:Base band facsimile signal A supplied through input terminal 1 is supplied to minimum point detecting circuit 2 and maximum point detecting circuit 3 each to deliver rectangular wave type signals C and D which hold the value up to the polarity inversion with every polar point. And signal A and output C are supplied to waveform processing circuit 4 to obtain signal B. Then the output of circuit 4 plus outputs C and D are supplied to waveform separating circuit 5. Circuit 5 holds waveform B during time T0-T1 and the value at time T1 during T1-T2 each. Thus separation waveform E which varies like the waveform produced by subtracting waveform B from the held value during T2-T3 is produced along with separation waveform F from waveforms E and B respectively. Then the orthogonal modulation is given to the carrier wave by waveforms E and F and through orthogonal modulating circuit 10 to carry out the transmission. Waveforms E and F have the band compressed to 1/4 in comparison with signal A.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP9846079A JPS5623074A (en) | 1979-07-31 | 1979-07-31 | Modulator for facsimile |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP9846079A JPS5623074A (en) | 1979-07-31 | 1979-07-31 | Modulator for facsimile |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5623074A true JPS5623074A (en) | 1981-03-04 |
Family
ID=14220302
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP9846079A Pending JPS5623074A (en) | 1979-07-31 | 1979-07-31 | Modulator for facsimile |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5623074A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4949657A (en) * | 1987-11-06 | 1990-08-21 | Janome Sewing Machine Co. Ltd. | Sewing machine with a device for amending thread tightening by needle positions |
-
1979
- 1979-07-31 JP JP9846079A patent/JPS5623074A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4949657A (en) * | 1987-11-06 | 1990-08-21 | Janome Sewing Machine Co. Ltd. | Sewing machine with a device for amending thread tightening by needle positions |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
EP0011464A3 (en) | Circuit and method for generating modulated oscillations and a modulated oscillatory signal generated by the method | |
JPS6481083A (en) | Multiplier | |
MY8200032A (en) | Amplitude limiting circuit for frequency modulated video signal | |
ES422597A1 (en) | Method and apparatus for amplifying signal transmission through transmission lines | |
JPS5623074A (en) | Modulator for facsimile | |
ES337527A1 (en) | Demodulating circuit for waves frequency modulated by signals of the video type | |
JPS6465921A (en) | Waveform shaping circuit | |
SU828371A1 (en) | Amplitude modulator | |
GB1475648A (en) | Narrow band-width compatable single sideband -cssb-transmission system and three tone generator used therein | |
JPS55125743A (en) | Multiplex signal receiver | |
SU809493A1 (en) | M-dm dc amplifier | |
SU575784A1 (en) | Frequency-modulated signal detector | |
SU122783A1 (en) | A device for receiving two-way modulation | |
JPS5494266A (en) | Pulse modulation system | |
JPS5640371A (en) | Drop-out compensating unit | |
SU347004A1 (en) | Reconnaissance station radio receiving device | |
SU566233A1 (en) | Correction apparatus | |
SU708535A1 (en) | Device for compression of facsimile signal frequency band | |
JPS5287933A (en) | Recording method of video signal | |
JPS5271911A (en) | Dc-ac amplitude modulation transmitting system | |
GB898496A (en) | Improvements in or relating to speech-signal transmission systems | |
JPS5631224A (en) | Fulse width modulating circuit | |
JPS5713978A (en) | High frequency switching inverter | |
JPS5530282A (en) | Communication system | |
ES477941A1 (en) | Multiple standard TV receiver - uses difference between audio and video carrier frequencies to select incoming signal standard |