Title:
METHOD FOR THE COMMON TRANSMISSION OF DIGITAL AND ANALOGUE MODULATED RADIO BROADCASTING AND/ OR TELEVISION BROADCASTING SIGNALS
Document Type and Number:
WIPO Patent Application WO1997011539
Kind Code:
A3
Abstract:
A method is described that is used for common transmission of digital- and analog-modulated radio and/or television signals, in particular over a broad band cable system (30). The method includes transmitting at least one digital radio and/or television signal along with an analog television signal in one and the same channel, in which the frequency spectrum of the at least one digital radio and/or television signal is limited to a frequency range that is less than the width of the at least one channel. To lessen the influence of the at least one digital radio and/or television signal on the analog television signal, the at least one digital radio and/or television signal must fall below a predetermined signal level, and the peak level of the analog television signal must exceed a predetermined value, which is markedly higher than the predetermined signal level of the at least one digital radio and/or television signal. To prevent cross-modulation between analog- and digital-modulated radio and/or television signals, the amplitude of the frequency spectrum of the at least one digital radio and/or television signal must fall below a predetermined value, which is markedly lower than the amplitude of the video carrier of the analog television signal.
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Inventors:
SIEGLE GERT (DE)
AMOR HAMED (DE)
MAHN HENDRICK (DE)
AMOR HAMED (DE)
MAHN HENDRICK (DE)
Application Number:
PCT/DE1996/001776
Publication Date:
May 15, 1997
Filing Date:
September 19, 1996
Export Citation:
Assignee:
BOSCH GMBH ROBERT (DE)
SIEGLE GERT (DE)
AMOR HAMED (DE)
MAHN HENDRICK (DE)
SIEGLE GERT (DE)
AMOR HAMED (DE)
MAHN HENDRICK (DE)
International Classes:
H04H20/31; H04N7/08; H04J1/00; H04J1/05; H04J7/00; H04J11/00; H04L5/02; H04L27/18; H04L27/34; H04N7/06; H04N7/081; H04N7/10; (IPC1-7): H04J/
Foreign References:
| EP0576797A2 | 1994-01-05 | |||
| US4937821A | 1990-06-26 |
Other References:
MOENECLAEY M ET AL: "DIGITAL HDTV BROADCASTING OVER THE CATV DISTRIBUTION SYSTEM", SIGNAL PROCESSING. IMAGE COMMUNICATION, vol. 5, no. 5/06, 1 December 1993 (1993-12-01), pages 405 - 415, XP000426712
LAFLIN N J ET AL: "THE PROVISION OF CIRCUITS TO OUTSIDE BROADCAST LOCATIONS USING SPECTRUM WITHIN THE UHF BROADCASTING BANDS", BBC RESEARCH AND DEVELOPMENT REPORT, no. 12, 1 January 1990 (1990-01-01), pages A - C, 1 - 21, XP000175800
LAFLIN N J ET AL: "THE PROVISION OF CIRCUITS TO OUTSIDE BROADCAST LOCATIONS USING SPECTRUM WITHIN THE UHF BROADCASTING BANDS", BBC RESEARCH AND DEVELOPMENT REPORT, no. 12, 1 January 1990 (1990-01-01), pages A - C, 1 - 21, XP000175800
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