JPS645189A - Digital iq demodulating system - Google Patents
Digital iq demodulating systemInfo
- Publication number
- JPS645189A JPS645189A JP16039787A JP16039787A JPS645189A JP S645189 A JPS645189 A JP S645189A JP 16039787 A JP16039787 A JP 16039787A JP 16039787 A JP16039787 A JP 16039787A JP S645189 A JPS645189 A JP S645189A
- Authority
- JP
- Japan
- Prior art keywords
- clock
- burst signal
- color burst
- subcarrier
- phase
- 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
Abstract
PURPOSE:To eliminate the need for a special delay element by generating a clock in phase with a color burst signal and delaying an I-axis subcarrier and a Q-axis subcarrier by specific quantities corresponding to the color burst signal respectively. CONSTITUTION:As for the format of the clock, a PLL circuit 18 outputs pulses P of frequency fsc in phase with the color burst signal according to the color burst signal of a composite video signal supplied from an input terminal 1 and a frequency converting circuit 19 generates the clock CP of 4fsc according to those pulses. Then the Q-axis subcarrier is only 90 deg., i.e. one clock delayed behind the I-axis subcarrier, so a one-clock delay circuit 27 only delays the output of an I-axis subcarrier generator 26 by one clock to generate the subcarrier. Thus, the clock is generated in phase with the color burst signal, so the phase of the clock need not be shifted and adjusted from the color burst signal, and no delay element is therefore required.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62160397A JP2535543B2 (en) | 1987-06-27 | 1987-06-27 | Digital IQ demodulation system |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62160397A JP2535543B2 (en) | 1987-06-27 | 1987-06-27 | Digital IQ demodulation system |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS645189A true JPS645189A (en) | 1989-01-10 |
JP2535543B2 JP2535543B2 (en) | 1996-09-18 |
Family
ID=15714062
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP62160397A Expired - Lifetime JP2535543B2 (en) | 1987-06-27 | 1987-06-27 | Digital IQ demodulation system |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP2535543B2 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2000054514A1 (en) * | 1999-03-08 | 2000-09-14 | Matsushita Electric Industrial Co. Ltd. | Color demodulating device |
WO2005088814A1 (en) * | 2004-03-15 | 2005-09-22 | Hitachi Medical Corporation | Power converter, inverter x-ray high voltage unit, fluoroscopic system, x-ray ct system, mri system |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6051387A (en) * | 1983-08-31 | 1985-03-22 | Sony Corp | Digital color decoder |
JPS60223278A (en) * | 1984-04-19 | 1985-11-07 | Nec Home Electronics Ltd | Digital color correcting device |
-
1987
- 1987-06-27 JP JP62160397A patent/JP2535543B2/en not_active Expired - Lifetime
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6051387A (en) * | 1983-08-31 | 1985-03-22 | Sony Corp | Digital color decoder |
JPS60223278A (en) * | 1984-04-19 | 1985-11-07 | Nec Home Electronics Ltd | Digital color correcting device |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2000054514A1 (en) * | 1999-03-08 | 2000-09-14 | Matsushita Electric Industrial Co. Ltd. | Color demodulating device |
US6567129B1 (en) | 1999-03-08 | 2003-05-20 | Matsushita Electric Industrial Co., Ltd. | Color demodulating device |
WO2005088814A1 (en) * | 2004-03-15 | 2005-09-22 | Hitachi Medical Corporation | Power converter, inverter x-ray high voltage unit, fluoroscopic system, x-ray ct system, mri system |
Also Published As
Publication number | Publication date |
---|---|
JP2535543B2 (en) | 1996-09-18 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
EXPY | Cancellation because of completion of term |