JPS5555664A - Frequency detector for analog facsimile - Google Patents
Frequency detector for analog facsimileInfo
- Publication number
- JPS5555664A JPS5555664A JP12789478A JP12789478A JPS5555664A JP S5555664 A JPS5555664 A JP S5555664A JP 12789478 A JP12789478 A JP 12789478A JP 12789478 A JP12789478 A JP 12789478A JP S5555664 A JPS5555664 A JP S5555664A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- circuit
- pulse
- synchronizing
- given
- 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.)
- Granted
Links
Landscapes
- Facsimile Transmission Control (AREA)
Abstract
PURPOSE: To enable digital processing, by picking up the sum of binary signal of input signal and the reference binary signal in synchronizing with a given phase point, and discriminating whether it is a given procedure signal or not through the count of the number of times.
CONSTITUTION: The input signal converted into binary signal ai is inputted to the code converter 1 and the gate circuit 2. The modulator 1 performs code conversion for it, and the signal Ai is outputted to the addition circuit 5. On the other hand, the gate circuit 2 outputs the operation start signal S in synchronizing with the rising phase of the signal ai. The frequency division circuit 3 divides the clock pulse CP based on the frequency dividing data D to produce the reference binary signal bi. The code converter 4 performs code conversion for the signal bi into the signal Bi. In this case, the circuit 3 produces the sampling pulse SP in synchronizing with a given phase point, and the circuit 5 performs the addition of the signals Ai and Bi every input of the pulse SP. The circuit 5 outputs pulse to the counter 6 when the result of addition is 10 and to the counter 7 when 00. Further, if the count values c1 and c2 are more than given values, they are discriminated as procedure signal.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP53127894A JPS6031381B2 (en) | 1978-10-19 | 1978-10-19 | Analog facsimile frequency detection device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP53127894A JPS6031381B2 (en) | 1978-10-19 | 1978-10-19 | Analog facsimile frequency detection device |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5555664A true JPS5555664A (en) | 1980-04-23 |
JPS6031381B2 JPS6031381B2 (en) | 1985-07-22 |
Family
ID=14971281
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP53127894A Expired JPS6031381B2 (en) | 1978-10-19 | 1978-10-19 | Analog facsimile frequency detection device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6031381B2 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS60194650A (en) * | 1984-03-15 | 1985-10-03 | Ricoh Co Ltd | Frequency signal discriminating circuit of communication system |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS4956523A (en) * | 1973-05-15 | 1974-06-01 |
-
1978
- 1978-10-19 JP JP53127894A patent/JPS6031381B2/en not_active Expired
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS4956523A (en) * | 1973-05-15 | 1974-06-01 |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS60194650A (en) * | 1984-03-15 | 1985-10-03 | Ricoh Co Ltd | Frequency signal discriminating circuit of communication system |
JPH0531862B2 (en) * | 1984-03-15 | 1993-05-13 | Ricoh Kk |
Also Published As
Publication number | Publication date |
---|---|
JPS6031381B2 (en) | 1985-07-22 |
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