JPS57208773A - Television receiver - Google Patents
Television receiverInfo
- Publication number
- JPS57208773A JPS57208773A JP56094966A JP9496681A JPS57208773A JP S57208773 A JPS57208773 A JP S57208773A JP 56094966 A JP56094966 A JP 56094966A JP 9496681 A JP9496681 A JP 9496681A JP S57208773 A JPS57208773 A JP S57208773A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- vertical synchronizing
- erase
- synchronizing signal
- television
- 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
- H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards
- H04N5/60—Receiver circuitry for the reception of television signals according to analogue transmission standards for the sound signals
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Television Receiver Circuits (AREA)
Abstract
PURPOSE:To surely erase sound at the absence of a signal, by detecting a vertical synchronizing signal from a composite synchronizing signal, converting it into a DC voltage signal, controlling an output of a television signal and discriminating the presence/absence of the television signal. CONSTITUTION:When a normal tlevision signal is applied to an input terminal 1 and inputted to an integration circuit 2, a vertical synchronizing signal component only is picked up and applied to a peak detection circuit 5. An output corresponding to the peak voltage of an integration circuit output is introduced from the peak detection circuit 5 and applied to the base of a PNP transistor 9. In this case, the transistor 9 is non-conductive at the vertical synchronizing signal part, and since a diode 11 is non-conductive accordingly, a control signal zeroing the attenuation is inputted to an electronic attenuator circuit 16 and the audio signal can be outputted without erase. When the input signal is a signal other than the television signal and includes no vertical synchronizing signal, a control signal attenuating sound is applied to the attenuator 16 to erase the audio signal.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP56094966A JPS57208773A (en) | 1981-06-18 | 1981-06-18 | Television receiver |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP56094966A JPS57208773A (en) | 1981-06-18 | 1981-06-18 | Television receiver |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS57208773A true JPS57208773A (en) | 1982-12-21 |
Family
ID=14124655
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP56094966A Pending JPS57208773A (en) | 1981-06-18 | 1981-06-18 | Television receiver |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS57208773A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6090476A (en) * | 1983-10-24 | 1985-05-21 | Sony Corp | Automatic shut-off device of television set |
JPS62187A (en) * | 1985-03-09 | 1987-01-06 | ドイチエ・トムソン−ブラント・ゲゼルシヤフト・ミツト・ベシユレンクテル・ハフツング | Receiver for television signal to be transmitted through cable |
JPS62188A (en) * | 1985-03-09 | 1987-01-06 | ドイチエ・トムソン−ブラント・ゲゼルシヤフト・ミツト・ベシユレンクテル・ハフツング | Receiver for tv signal to be transmitted through cable |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS4990038A (en) * | 1972-12-27 | 1974-08-28 |
-
1981
- 1981-06-18 JP JP56094966A patent/JPS57208773A/en active Pending
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS4990038A (en) * | 1972-12-27 | 1974-08-28 |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6090476A (en) * | 1983-10-24 | 1985-05-21 | Sony Corp | Automatic shut-off device of television set |
JPS62187A (en) * | 1985-03-09 | 1987-01-06 | ドイチエ・トムソン−ブラント・ゲゼルシヤフト・ミツト・ベシユレンクテル・ハフツング | Receiver for television signal to be transmitted through cable |
JPS62188A (en) * | 1985-03-09 | 1987-01-06 | ドイチエ・トムソン−ブラント・ゲゼルシヤフト・ミツト・ベシユレンクテル・ハフツング | Receiver for tv signal to be transmitted through cable |
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