IPC분류정보
| 국가/구분 |
United States(US) Patent
등록
|
| 국제특허분류(IPC7판) |
|
| 출원번호 |
US-0681850
(1991-04-08)
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발명자
/ 주소 |
- Sklar Richard E. (Huntington Beach CA) Rabowsky Irving (Woodland Hills CA)
|
| 출원인 / 주소 |
- Hughes Aircraft Company (Los Angeles CA 02)
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| 인용정보 |
피인용 횟수 :
35 인용 특허 :
0 |
초록
▼
A passenger aircraft video distribution system distributes modulated RF signals provided from a central signal source to be used at each passenger seat. The RF signals are distributed by means of various RF components, including amplifiers (90, 14a, 164, 24a, 24b, 34a), taps (180, 210) and splitters
A passenger aircraft video distribution system distributes modulated RF signals provided from a central signal source to be used at each passenger seat. The RF signals are distributed by means of various RF components, including amplifiers (90, 14a, 164, 24a, 24b, 34a), taps (180, 210) and splitters (108, 182, 214). In order to ensure proper RF levels for best tuner operation, each of a number of stations in the distribution system is provided with a variable gain amplifier (90, 14a, 164, 24a, 24b, 34a) controllable by a microprocessor (92, 50a, 220, 52a, 56a, 216). A separate service line (222, 224, 226, 228, 230, 232, 234) enables a central microprocessor to monitor RF levels at different stations to automatically provide, via the same service line, appropriate gain control signals to obtain proper RF levels. The monitored RF levels are also employed for diagnostic purposes.
대표청구항
▼
In a signal transmission system having first, second and third stations connected successively in a chain of stations by a signal transmission line, each station having a variable gain amplifier for controlling level of signals received thereby and for transmitting and receiving signals, a method of
In a signal transmission system having first, second and third stations connected successively in a chain of stations by a signal transmission line, each station having a variable gain amplifier for controlling level of signals received thereby and for transmitting and receiving signals, a method of controlling level of signals received at said stations comprising the steps of: monitoring the received signal level at the output of said amplifiers, employing the signal level monitored at the output of the amplifier of said second station to vary the gain of the amplifier at said first station, wherein said first station is located upstream relative to said second station, thereby nominally varying the level of signal transmitted to said third station, and adjusting the gain of the amplifier at said third station to compensate for the variation in gain of the amplifier at said first station, wherein said third station is located downstream relative to said second station.
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