Multiplex TV signal processing apparatus
US4985769A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 23, 1988 |
| Grant date | Jan 15, 1991 |
| Priority date | — |
| Expiry date | Mar 23, 2008 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N11/30
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Disclosed are multiplex television signal processing apparatuses in a television signal transmitting and receiving system. An apparatus at the transmitting side comprises: a signal separator to separate a multiplex signal into a first and a second part; a time-multiplexer to time-multiplex a main television signal and the first part of the multiplex signal to obtain a time-multiplexed main signal; a first amplitude-modulator for modulating a first carrier by the multiplexed main signal to obtain a vestigial side band signal, amplitude-modulated main signal; a second amplitude-modulator for modulating a second carrier which is same in frequency as but different in phase by 90 degrees from the first carrier by a second multiplex signal; an inverse Nyquist filter for filtering this signal to obtain a vestigial side band, amplitude-modulated multiplex signal; and an adder for adding the vestigial side band, amplitude-modulated main and multiplex signals to obtain a multiplexed signal. An apparatus at the receiving side comprises: a Nyquist filter for filtering the multiplexed signal; a carrier regenerator for regenerating the first and second carriers from the multiplexed signal; a mai…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.