Method and system for transmitting audio data together with other data, comprising addressing data, to a receiver

DETAILED DESCRIPTION OF THE INVENTION The example illustrated in connection with the accompanying FIGS.
1 and 2 utilises a DAB receiver which incorporates a GSM mobile telephone.
A DAB transmission system 1 provides an audio information broadcast 2, the broadcast 2 comprising both audio information 3 provided from an audio content provider 4 and addressing data 5 provided by an audio link information system 6.
The audio information and the addressing data are combined at 7 and fed to the DAB transmission system 1.
As is well known, a DAB transmission incorporates a PAD channel and it is the PAD channel which carries the audio link information or addressing data 5.
At a receiver 8 a listener or user is able to activate a key 9 (known as the "Tell Me More" [TMM] key) which causes the addressing information received on the PAD channel to be decoded by a decoder 10 and passed to the GSM telephone 11 which, using the decoded addressing data dials, an appropriate number to a service provider 12.
The service provider maintains a database of audio "clips" 13, each one corresponding to corresponding addressing data 5.
On receiving the transmission from the GSM transmitter 11 the database is scanned for a match and the corresponding audio clip is transferred from the database to a transmitter 14 which transmits information to the receiver 8.
The transmitter 14 may be a separate DAB transmitter or the like, but in the present example it is preferably a GSM transmitter and the information is transmitted back to the receiver through the same call initiated by the user.
The use of the system will now be described in more detail by reference to the table of FIG.
2.
The example shown in the table of FIG.
2 comprises a DAB programme 20 which carries a news item, in the example, describing an (imaginary) incident in the Gaza Strip, a portion of the text of which is shown at 21.
The DAB PAD channel 30 contains addressing or link information which enables the user to find out more information about the Gaza Strip and on receipt of the PAD channel information at a receiver display 8' (see FIG