JPS6458150A - Sweep/tracking control circuit for demodulator - Google Patents
Sweep/tracking control circuit for demodulatorInfo
- Publication number
- JPS6458150A JPS6458150A JP62214598A JP21459887A JPS6458150A JP S6458150 A JPS6458150 A JP S6458150A JP 62214598 A JP62214598 A JP 62214598A JP 21459887 A JP21459887 A JP 21459887A JP S6458150 A JPS6458150 A JP S6458150A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- init
- circuit
- counter
- tracking control
- 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
- Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
Abstract
PURPOSE:To exclude a counter counting INIT signal intervals to reduce the scale of hardware by providing a differentiating (shift) circuit and an INIT detection circuit. CONSTITUTION:A differentiation (shift) circuit 68 receives an ICAR signal and a demodulator clock DEM CLK and generates a signal 1 of one bit width (one period of DEM CLK) and uses it as forward/backward protection counters 62, 64. In receiving the INIT signal, the forward protection counter 64 is loaded. The signal 1 is given to an INIT detecting circuit 60 and the said circuit 66 is set by the said signal 1 when the INIT signal comes just before the signal 1. Since the counter clock signal 1 appears just after the INIT signal, then the sweep tracking control signal S/T is changed immediately depending whether the INIT signal by protection stage number comes or does not come.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62214598A JPH0761088B2 (en) | 1987-08-28 | 1987-08-28 | Demodulator sweep / tracking control circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62214598A JPH0761088B2 (en) | 1987-08-28 | 1987-08-28 | Demodulator sweep / tracking control circuit |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS6458150A true JPS6458150A (en) | 1989-03-06 |
JPH0761088B2 JPH0761088B2 (en) | 1995-06-28 |
Family
ID=16658368
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP62214598A Expired - Lifetime JPH0761088B2 (en) | 1987-08-28 | 1987-08-28 | Demodulator sweep / tracking control circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH0761088B2 (en) |
-
1987
- 1987-08-28 JP JP62214598A patent/JPH0761088B2/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
JPH0761088B2 (en) | 1995-06-28 |
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