SISTEMA,APARELHO E RECEPTOR PARA TRANSMISSAO E RECEPCAO DE UM SINAL
- 申请公布号：
- BR8907351(A)
- 申请号：
- BR19898907351
- 申请日期：
- 1989.03.29
- 申请公布日期：
- 1991.03.19
- 申请人：
- ZENITH ELECTRONICS CORPORATION
- 发明人：
- RICHARD W. CITTA;RONALD B. LEE
- 分类号：
- H04N7/015;H04N7/08;H04N7/085;H04N7/088;H04N7/12;H04N7/26;H04N11/00;H04N11/24;(IPC1-7):H04N7/04
- 主分类号：
- H04N7/015
- 摘要：
- A hybrid television signal of less transmission power or better signal to noise performance is made up by removing low frequency analog components from the video signal, digitizing them and sending them as data in non-active video portions of the transmitted signal. A two step hybridization process, with the first step removing the line averaged value of the video components of the video signal and the second step removing the remainder of the video components under 200 KHz, is described. Temporal filtering, signal pre-emphasis, compression, dispersal and double sideband suppressed carrier modulation about a centered carrier are disclosed for reducing peak signal amplitudes and for minimizing co-channel interference to and from NTSC signals. In an FM implementation, the benefits of the hybrid signal are realized as a reduction in bandwidth and consequent improved noise performance. The hybrid signal system is uniquely adapted to a high definition television signal in a limited frequency channel.
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