DE4006933A1 - Universal decoder for program-accompanying data - is of modular type usable in VHF and TV receivers for wide range evaluation - Google Patents

Abstract

The decoding system is of modular design, with a facility for subsequent incorporation in prepared VHF and TV receivers. Thus the receivers can evaluate program-accompanying, or program-simulating RDS, NICAM, D2-MAC etc. data. Pref. the system contains a Prager decoder so that the entire system is suitable for transmission of Alpha numeric messages, switching signals, tuning data etc. to a classifiable USW or TV receiver, using radio, cable, link and/or satellite paths. The used systems are typically fitted in housings with an outer dimension of a commercial audio cassette. ADVANTAGE - Enables data instead of audio signals to be fed and evaluated at reception side.

Description

New digital technologies make it possible to inaudibly accompany the program Broadcast data in radio and audio channels of TV broadcasting to be able to. On the other hand, it is - for the purpose of building a data transmission system - possible to feed in data instead of the audio signal and evaluate on the reception side.

RDS

The Radio Data System RDS according to specification 3244-E of the European Broadcasting Union EBU offers a data transfer rate of 1187.5 bits / s on FM radio. RDS to EBU enables the transfer of data for Voting aids, alphanumeric messages and switching signals to everyone FM receiver. As further explained, RDS can also be incorporated into the TV being integrate.

Examples of program-related information on FM radio:

• - Name of the broadcaster - for display purposes -
• - Information on completing the credit card block list
  Patent application P 39 43 202.5 v. December 28, 89
• - Signals for navigation aid
  Patent application P 39 43 187-8 v. December 28, 89

NICAM 728

The NICAM 728 system according to EBU enables the transmission of an accompanying program Data rate of 11 kbits / s in the audio part of the TV signal

• - on the radio,
• - in cable systems or
• - Link u. Satellite routes

to all receivers who set the corresponding transmission frequency to have.

If one or more binary-coded RDS Data streams into the NICAM system can use the RDS features inventive way to be integrated into the TV being.

MAC

The MAC system family - as an alternative to television transmission systems PAL, SECAM, etc. - also offers program-accompanying data transmissions. Example D2-MAC: max. 872 kbps.

The innovation according to claim 1 relates to retrofitting of a recipient with a

RDS or
RDS / NICAM or
RDS / NICAM / D2-MAC or
RDS / D2-MAC or
NICAM / D2-MAC-

or similar decoder. Since the decoding systems then in larger numbers can be produced, there are cost advantages.  

The VHF or TV receiver industry, these with little effort Prepare for armament then has the option of being confusing To reduce product diversity. This can u. U. whole Production lines can be saved. Example: the production of a Car radios with RDS are no longer required.

RDS RADIO PAGING

RDS radio paging according to supplement 2 of the EBU 3244-E enables one Addressability of the VHF receiver (paging system). So z. B. Systems according to claim 2. with the help of FM Broadcasting conveniently

• - Remote control of all traffic lights in a city
• - Driving orders displayed to taxi drivers or
• - Various one-way point-to-point data connections being constructed.

The feeding of the RDS radio paging data stream into the NICAM or NICAM / D2 MAC system in turn enables wireless or wired Data transmission to individually addressable or classifiable TV receivers. So z. B. with this system of descramblers of a paying TV subscriber (Pay-TV) can be switched off remotely (patent application Rohde & Black v. 8. 12. 89). Claim 2 enables the simple receiver side Realization of this system.

By skilful planning of the address list, one can also Classification of the recipients are made, e.g. B .:

• - Addresses beginning with 4: military applications
• - Addresses with 5 u. 6 begin: public
• - Addresses beginning with 7: postal
• - addresses starting with 8: descrambler, etc.

The invention according to claim 3 offers the possibility of existing Cassette slots to accommodate the decoder use.

It shows Fig. 1, the solution according to claim 3. A tape-shaped decoder 1 is located in a layer 7 of a home or car receiver. The distinction from a normal cassette is determined with a mechanical or electrical sensor 2 , thus interrupting the motor voltage and switching on other functions. The electrical interface to the receiver is implemented using a plug 3 or the like. For a home receiver, the 8 or multi-digit display 4 is placed in the clear area of the cassette cover. In the case of car radio, the 8- or multi-digit display 5 can be added using plug-in technology, e.g. B. via a flat cable 6 .

The decoder according to claim 3 can be used when not in use - e.g. B. at Play a cassette in the cassette compartment.

Claims (3)

1. Data decoder system, characterized in that it has a modular structure and can be retrofitted into prepared FM and TV receivers, so that these receivers can evaluate the program-accompanying / program-simulating data from RDS, NICAM, D2-MAC, or the like can. 2. System according to claim 1, characterized in that it contains a Prague decoder and thereby the entire system for the transmission of alphanumeric messages, switching signals, Data on the voting aid or similar to classifiable VHF or TV receiver using radio or cable, link or / and satellite routes. 3. Systems according to claim 1 or 2, characterized in that they are housed in housings that have the external dimensions a commercially available audio cassette.