Method of transmitting digital HDTV signals

• US 5,430,492 A
• Filed: 05/12/1992
• Issued: 07/04/1995
• Est. Priority Date: 08/02/1991
• Status: Expired due to Fees

• Current Assignee: Rohde & Schwarz GmbH & Company KG
• Original Assignee: Rohde & Schwarz GmbH & Company KG
• Inventors: Dambacher, Paul
• Primary Examiner(s): Peng, John K.
• Application Number:
  US07/881,769
• Time in Patent Office: 1,148 Days
• Field of Search: 358/186, 358/185, 455/103, 370/20, 370/19, 370/37, 370/75, 348/469, 348/487, 348/723, 348/484
• US Class Current: 348/469
• CPC Class Codes: H04B 14/046 Systems or methods for reducing noise or bandwidth
• CPC Class Codes: H04B 7/18523 Satellite systems for providing broadcast service to terrestrial stations, i.e. broadcast satellite service arrangements specially adapted for satellite broadcast receiving H04H40/90; picture transmission via satellite H04N1/00103; television transmission via satellite H04N7/20
• CPC Class Codes: H04H 2201/19 digital satellite radio [DSR]
• CPC Class Codes: H04N 21/2383 Channel coding or modulation of digital bit-stream, e.g. QPSK modulation arrangements for detecting or preventing errors in the information received by adapting the channel coding H04L1/0009; analogue front ends or means for connecting modulators, demodulators or transceivers to a transmission line H04L27/0002
• CPC Class Codes: H04N 21/4382 Demodulation or channel decoding, e.g. QPSK demodulation analog front ends or means for connecting modulators, demodulators or transceivers to a transmission line H04L27/0002
• CPC Class Codes: H04N 7/015 High-definition television systems
• CPC Class Codes: H04N 7/12 Systems in which the television signal is transmitted via one channel or a plurality of parallel channels, the bandwidth of each channel being less than the bandwidth of the television signal H04N7/24 takes precedence
• CPC Class Codes: H04N 7/20 Adaptations for transmission via a GHz frequency band, e.g. via satellite
• CPC Class Codes: H04N 7/54 the signals being synchronous H04N21/23602, H04N21/23614, H04N21/2365, H04N21/2368, H04N21/4341, H04N21/4342, H04N21/4347, H04N21/4348 take precedence

Abstract

For transmitting digital HDTV signals, the HDTV signal, which is either fed with a data rate of ≦20.48 Mbit/s or which is data-reduced to such a data rate of ≦20.48 Mbit/s by means of a method utilizing the psycho-optical phenomena of the human eye, is split at the transmitter side of a broadband transmission link operating on the DSR method into two data streams of ≦10.24 Mbit/s each, and is fed to the I/Q interface of the 4PSK modulator of the DSR transmission link. These two data streams whch are transmitted to the I/Q output of the 4PSK demodulator of the DSR transmission link are then further processed thereat.

Claims

1. A method of transmitting a digital HDTV signal, comprising the steps of:

providing a broadband transmission link which operates on a DSR method and which has a transmitter side and a receiver side;

feeding the HDTV signal at a data rate of ≦

20.48 Mbit/s;

splitting the HDTV signal into two data streams of ≦

10.24 Mbit/s each, and at the transmitter side feeding the two data streams to an I/Q interface of a 4PSK modulator of the DSR broadband transmission link; and

transmitting the two data streams to an I/Q output of a 4PSK demodulator at the receiver side of the DSR transmission link where they are further processed.

2. A method according to claim 1 including the step of feeding the two data streams of ≦

10.24 Mbit/s each at said I/Q output of the 4PSK demodulator to an HDTV decoder in which they are converted to a digital or analog television signal suitable for use in a digital or analog TV receiver.

3. A method according to claim 1 including the step of providing a corresponding re-encoding of the two data streams at said I/Q output of said 4PSK demodulator, and then feeding them to a modulator input of a TV transmitter of a terrestrial TV transmitter network.

4. A method according to claim 1 including the step of providing the broadband transmission link as a satellite link.

5. A method according to claim 1 including the step of providing the broadband transmission link as a coaxial cable transmission link.

6. A method of transmitting digital television signals, comprising the steps of:

providing two data-reduced digital television signals each having a data rate of ≦

10.24 Mbit/s;

feeding said two data-reduced digital television signals to an I/Q interface of a 4PSK modulator at a transmitter side of a DSR broadband transmission link; and

transmitting the two television signals to an I/Q output of a 4PSK demodulator at a receiver side of said DSR transmission link.

7. A method according to claim 6 including the step of providing the broadband transmission link as a satellite link.

8. A method according to claim 6 including the step of providing the broadband transmission link as a coaxial cable transmission link.