Digital broadcast transmission system comprising a power...

H - Electricity – 04 – B

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

H04B 7/005 (2006.01) H03G 3/00 (2006.01) H03G 3/30 (2006.01) H04N 5/38 (2006.01)

Patent

CA 2374255

A high definition television broadcast transmission system includes a feature of maintaining a constant transmission output power. A system includes components, such as a digital encoder (12), for providing an information signal. A pilot source (30) provides a pilot signal. A combiner (26) combines the information and pilot signals. A power amplifier (50) amplifies the combined information and pilot signals to a broadcast transmission power level. An automatic gain control (38), located upstream of the amplifier (50), increases gain of the information signal in response to a control signal. The broadcast transmission power level of the information signal is dependent upon the gain applied by the gain control. A sample signal contains the combined information and pilot signals, is derived from an output of the power amplifier (50). A pilot-indicative signal is isolated from the sample signal. The control signal for the gain control (38) is determined using the pilot- indicative signal.

La présente invention concerne un système d'émission pour TVHD comportant un dispositif permettant d'entretenir une puissance de sortie d'émission constante. Ce système comporte des composants tels qu'un codeur numérique (12) fournissant un signal d'information. Une source de pilote (30) fournit un signal pilote. Un combineur (26) combine l'information et les signaux pilotes. Un amplificateur de puissance (50) amplifie l'information et les signaux pilotes combinés jusqu'à un niveau de puissance d'émission de radiodiffusion. Une commande automatique de gain (38) située en amont de l'amplificateur (50) augmente le gain du signal d'information en réaction à un signal de commande. Le niveau de puissance d'émission de radiodiffusion du signal d'information est fonction du gain appliqué par la commande de gain. Un signal échantillon qui contient l'information et les signaux pilotes combinés est déduit d'une sortie de l'amplificateur de puissance (50). Un signal caractéristique du pilote est isolé du signal échantillon. Pour déterminer le signal de commande de la commande de gain (38), on utilise le signal caractéristique du pilote.

LandOfFree

Say what you really think

Search LandOfFree.com for Canadian inventors and patents. Rate them and share your experience with other people.

Rating

Digital broadcast transmission system comprising a power... does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Digital broadcast transmission system comprising a power..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Digital broadcast transmission system comprising a power... will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFCA-PAI-O-2071542

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.