ES2021536A6 - Vestigial-band modulator for television - Google Patents
Vestigial-band modulator for televisionInfo
- Publication number
- ES2021536A6 ES2021536A6 ES9001277A ES9001277A ES2021536A6 ES 2021536 A6 ES2021536 A6 ES 2021536A6 ES 9001277 A ES9001277 A ES 9001277A ES 9001277 A ES9001277 A ES 9001277A ES 2021536 A6 ES2021536 A6 ES 2021536A6
- Authority
- ES
- Spain
- Prior art keywords
- signal
- frequency
- vestigial
- integrated circuit
- amplifier
- 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.)
- Expired - Fee Related
Links
Landscapes
- Amplitude Modulation (AREA)
Abstract
Vestigial-sideband modulator for television, characterised in that it comprises an integrated circuit through one of the pins of which a video signal enters the modulator, an audio signal entering via another connector, in that it uses a transistor in common-emitter mode for amplifying the signal, being pre-emphasised then later entering the abovementioned integrated circuit into which a TV IF oscillator signal and a signal originating from the resonant network also enter, in that an IF amplifier compiles the modulated TV signal input then entering a surface-wave filter, a transistor having been provided for amplifying the vestigial signal appearing out of the filter, the output frequency being determined by a PLL of adjustable frequency which can be matched to that from a VCO, in that an active low-pass filter is provided for filtering the resulting oscillation, a pre- scaling circuit being present and another integrated circuit for the purpose of successively reducing this frequency, in that it uses a diode bridge for the purposes of mixing the frequency from the CO and the video signal, the low-frequency signals being selected by means of a low-pass filter, in that it uses a variable attenuator before the signal is input into the amplifier, and the amplifier unit being of the plug-in type.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ES9001277A ES2021536A6 (en) | 1990-05-07 | 1990-05-07 | Vestigial-band modulator for television |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ES9001277A ES2021536A6 (en) | 1990-05-07 | 1990-05-07 | Vestigial-band modulator for television |
Publications (1)
Publication Number | Publication Date |
---|---|
ES2021536A6 true ES2021536A6 (en) | 1991-11-01 |
Family
ID=8267196
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
ES9001277A Expired - Fee Related ES2021536A6 (en) | 1990-05-07 | 1990-05-07 | Vestigial-band modulator for television |
Country Status (1)
Country | Link |
---|---|
ES (1) | ES2021536A6 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
ES2046113A2 (en) * | 1992-05-04 | 1994-01-16 | Tagra Sa | Modulator with variable output channel |
-
1990
- 1990-05-07 ES ES9001277A patent/ES2021536A6/en not_active Expired - Fee Related
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
ES2046113A2 (en) * | 1992-05-04 | 1994-01-16 | Tagra Sa | Modulator with variable output channel |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
RD1A | Patent seized |
Effective date: 19951115 |
|
FD1A | Patent lapsed |
Effective date: 20000301 |