JPS5758480A - De-emphasis circuit - Google Patents
De-emphasis circuitInfo
- Publication number
- JPS5758480A JPS5758480A JP55132860A JP13286080A JPS5758480A JP S5758480 A JPS5758480 A JP S5758480A JP 55132860 A JP55132860 A JP 55132860A JP 13286080 A JP13286080 A JP 13286080A JP S5758480 A JPS5758480 A JP S5758480A
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- level
- synchronizing signal
- tip
- signal
- 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
- H04N5/00—Details of television systems
- H04N5/76—Television signal recording
- H04N5/91—Television signal processing therefor
- H04N5/92—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback
- H04N5/923—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback using preemphasis of the signal before modulation and deemphasis of the signal after demodulation
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Television Signal Processing For Recording (AREA)
Abstract
PURPOSE:To operate a de-emphasis circuit in excellent manner, by detecting the DC level of tip a synchronizing signal to be sampled and adjusting the bias level of a variable bias circuit according to this DC level. CONSTITUTION:A variable bias circuit 2 includes a synchronizing signal and stored on a medium through frequency modulation. The output of this circuit is transmitted to a de-emphasis circuit 3. The synchronizing signal in the output signal of the circuit 3 is sampled with the synchronizing signal from a synchronizing generation circuit 5 and the DC component at the tip of this signal is detected at a sample hold circuit 4. A voltage corresponding to the detected DC level is applied to the circuit 2 through the adjustment of a DC amplifying cirucit 6. Thus, the DC level of the tip of the synchronizing signal to be de-emphasized is kept constant to increase dynamic range and lower the operating voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP55132860A JPS5758480A (en) | 1980-09-26 | 1980-09-26 | De-emphasis circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP55132860A JPS5758480A (en) | 1980-09-26 | 1980-09-26 | De-emphasis circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5758480A true JPS5758480A (en) | 1982-04-08 |
Family
ID=15091219
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP55132860A Pending JPS5758480A (en) | 1980-09-26 | 1980-09-26 | De-emphasis circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5758480A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60231899A (en) * | 1984-04-26 | 1985-11-18 | 株式会社 興人 | Heat resistant sheet and its production |
| JPS6298000A (en) * | 1985-10-25 | 1987-05-07 | 日東紡績株式会社 | Inorganic fiberboard |
| US4806206A (en) * | 1983-07-28 | 1989-02-21 | Kojin Co., Ltd. | Process for preparing ceramic molding |
| US5679433A (en) * | 1991-10-31 | 1997-10-21 | Kabushiki Kaish Tokiwa Denki | Noncombustible sheet, noncombustible laminated sheet, noncombustible honey comb structural material, noncombustible board, noncombustible molded product, and manufacturing method thereof |
-
1980
- 1980-09-26 JP JP55132860A patent/JPS5758480A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4806206A (en) * | 1983-07-28 | 1989-02-21 | Kojin Co., Ltd. | Process for preparing ceramic molding |
| JPS60231899A (en) * | 1984-04-26 | 1985-11-18 | 株式会社 興人 | Heat resistant sheet and its production |
| JPS6298000A (en) * | 1985-10-25 | 1987-05-07 | 日東紡績株式会社 | Inorganic fiberboard |
| JPH0160600B2 (en) * | 1985-10-25 | 1989-12-25 | Nitto Boseki Co Ltd | |
| US5679433A (en) * | 1991-10-31 | 1997-10-21 | Kabushiki Kaish Tokiwa Denki | Noncombustible sheet, noncombustible laminated sheet, noncombustible honey comb structural material, noncombustible board, noncombustible molded product, and manufacturing method thereof |
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