MX9604558A - Cerrojo de control automatico de frecuencia, excitado por segmento de datos para bucle acerrojado en fase de frecuencia estable bifasica. - Google Patents
Cerrojo de control automatico de frecuencia, excitado por segmento de datos para bucle acerrojado en fase de frecuencia estable bifasica.Info
- Publication number
- MX9604558A MX9604558A MX9604558A MX9604558A MX9604558A MX 9604558 A MX9604558 A MX 9604558A MX 9604558 A MX9604558 A MX 9604558A MX 9604558 A MX9604558 A MX 9604558A MX 9604558 A MX9604558 A MX 9604558A
- Authority
- MX
- Mexico
- Prior art keywords
- mode
- agc
- coherent
- gain
- data segment
- Prior art date
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
- H04N5/455—Demodulation-circuits
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
- Circuits Of Receivers In General (AREA)
- Television Systems (AREA)
- Synchronisation In Digital Transmission Systems (AREA)
- Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)
Abstract
La presente invencion se refiere a un sistema de control automático de ganancia (ACC) de modo dual para un receptor de television en donde datos en la forma de símbolos ocurren a una velocidad de símbolos fija. Los símbolos se envían en segmentos de datos sucesivos, cada uno tiene un carácter de sincronizacion. La activacion de una señal de superacion control automático de frecuencia (AFC) define un intervalo inicial durante el cual la ganancia de frecuencia intermedia (IF) es máxima. Cuando la señal de anulacion AFC se vuelve inactiva, el receptor se opera en un modo no coherente en el que la ganancia del amplificador IF se reduce de manera incrementada, siempre que la señal IF excede un nivel de recorte por un período de ocho sincronizaciones de símbolo sucesivas. Cuando ocurre una condicion de neclavamiento de sincronizacion de segmento, se accesa a un modo coherente normal, en donde el AGC responde a una característica de señal, es decir sincronizacion de segmento de dato. La velocidad de cambio de ganancia disponible en el modo AGC no coherente es mucho mayor que en el AGC coherente normal.
Applications Claiming Priority (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US223077 | 1981-01-07 | ||
US22307794A | 1994-04-04 | 1994-04-04 | |
US08354408 | 1994-12-12 | ||
US08/354,408 US5627604A (en) | 1994-04-04 | 1994-12-12 | Stabilizing the lock up of a bi-phase stable FPLL by augmenting a recovered DC pilot |
PCT/US1995/003754 WO1995027371A1 (en) | 1994-04-04 | 1995-03-31 | Data segment driven afc latch for bi-phase stable frequency phase locked loop |
Publications (2)
Publication Number | Publication Date |
---|---|
MX9604558A true MX9604558A (es) | 1997-09-30 |
MXPA96004558A MXPA96004558A (es) | 1998-07-03 |
Family
ID=
Also Published As
Publication number | Publication date |
---|---|
WO1995027371A1 (en) | 1995-10-12 |
US5627604A (en) | 1997-05-06 |
TW313742B (es) | 1997-08-21 |
KR970702659A (ko) | 1997-05-13 |
KR100274291B1 (ko) | 2000-12-15 |
JPH09511629A (ja) | 1997-11-18 |
JP3188468B2 (ja) | 2001-07-16 |
CN1145151A (zh) | 1997-03-12 |
CA2186339C (en) | 1999-12-07 |
CN1078794C (zh) | 2002-01-30 |
CA2186339A1 (en) | 1995-10-12 |
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