Claims
- 1. A broadcast transmitter system comprising:
signal provision means for providing an information signal; power amplifier means for amplifying the information signal to a broadcast transmission power level; post-amplification processing means for conditioning the information signal after the information signal is amplified by said power amplifier means, said post-amplification conditioning means being located downstream of said power amplifier means, and said post-amplification conditioning means subjecting the information signal to distortion shifts away from intended values; and compensating means for modifying the information signal to compensate for the distortion shifts imposed by said post-amplification processing means, said compensating means being located upstream of said power amplifier means.
- 2. A system as set forth in claim 1 wherein said post-amplification processing means includes filter means for filtering an output of the power amplifier means.
- 3. A system as set forth in claim 1 wherein said filter means includes a band-limiting filter.
- 4. A system as set forth in claim 3 wherein said band-limiting filter shapes the band of the output of the power amplifier means.
- 5. A broadcast transmitter system comprising:
a signal source that provides an information signal; a power amplifier that amplifies the information signal to a broadcast transmission power level; a post-amplification filter that conditions the information signal after the information signal is amplified by said power amplifier, said post-amplification filter being located downstream of said power amplifier, and said post-amplification filter subjecting the information signal to distortion shifts away from intended values; a linear equalizer that modifies the information signal to compensate for the distortion shifts imposed by said post-amplification filter, said linear equalizer being located upstream of said power amplifier.
- 6. A system as set forth in claim 5 wherein said post-amplification filter filters an output of the power amplifier.
- 7. A system as set forth in claim 5 wherein said post-amplification filter includes a band-limiting filter.
- 8. A system as set forth in claim 7 wherein said band-limiting filter shapes the band of the output of the power amplifier.
- 9. A broadcast transmitter system comprising:
a signal source that provides an information signal; a power amplifier that amplifies the information signal to a broadcast transmission power level, said power amplifier subjecting the information signal to distortion shifts away from intended values; a pre-amp filter that conditions the information signal before the information signal is amplified by said power amplifier, said pre-amp filter being located upstream of said power amplifier, and said pre-amp filter subjecting the information signal to distortion shifts away from intended values; a post-amplification filter that conditions the information signal after the information signal is amplified by said power amplifier, said post-amplification filter being located downstream of said power amplifier, and said post-amplification filter subjecting the information signal to distortion shifts away from intended values; a first linear equalizer that modifies the information signal to compensate for the distortion shifts imposed by said post-amplification filter, said first linear equalizer being located upstream of said pre-amp filter; a non-linear corrector that modifies the information signal to compensate for the distortion shifts imposed by said power amplifiers, said non-linear corrector being located downstream of said first linear equalizer and upstream of said pre-amp filter; and a second linear equalizer that modifies the information signal to compensate for the distortion shifts imposed by said pre-amp filter, said second linear equalizer being located downstream of said non-linear corrector and upstream of said pre-amp filter.
- 10. A system as set forth in claim 9 including a first sample coupling that couples off a first sample of the information signal after said pre-amp filter and before said power amplifier, and a controller that utilizes the first sample to determine the modification to be imposed by said second linear equalizer on the information signal.
- 11. A system as set forth in claim 10 including a second sample coupling that couples off a second sample of the information signal after said power amplifier and before said post-amplification filter, and wherein said controller utilizes the second sample to determine the modification to be imposed by said non-linear corrector on the information signal.
- 12. A system as set forth in claim 11 including a third sample coupling that couples off a third sample of the information signal after said post-amplification filter, and wherein said controller utilizes the third sample to determine the modification to be imposed by said first linear equalizer on the information signal.
- 13. A system as set forth in claim 9, wherein the information signal is provided as a complex format signal, said system includes a first converter that converts the information signal from complex format to real format, said first converter is located upstream of said first linear equalizer, said first linear equalizer modifies the information signal in real format.
- 14. A system as set forth in claim 13 including a second converter that converts the information signal from real format to complex format, said second converter is located downstream of said first linear equalizer and upstream of said non-linear corrector, said non-linear corrector modifies the information signal in complex format.
- 15. A system as set forth in claim 14 including a third converter that converts the information signal from complex format to real format, said third converter is located downstream of said non-linear corrector and upstream of said second linear equalizer, said second linear equalizer modifies the information signal in real format.
RELATED APPLICATION
[0001] This application claims benefit of U.S. patent application Ser. No. 09/105,824, filed Jun. 26, 1998, allowed, and U.S. patent application Ser. No. 09/312,344, filed May 14, 1999, allowed.
Continuations (2)
|
Number |
Date |
Country |
Parent |
09105824 |
Jun 1998 |
US |
Child |
09905560 |
Jul 2001 |
US |
Parent |
09312344 |
May 1999 |
US |
Child |
09905560 |
Jul 2001 |
US |