Patent EA-003213-B1 (EA)
Title: Embedding a first digital information signal into a second digital information signal for transmission via a transmission medium
Inventor: DE BONT FRANCISCUS M J
IPC: G10L19/02
Filed: 2000-12-19
Abstract: 1. Transmitter for transmitting a first and second digital information signal via a transmission medium, said first digital information signal comprising first frames having at least a first synchronization signal and a data portion stored in them, the transmitter comprising: input means for receiving the first and second digital information signal; processing means for processing the second digital information signal into subsequent second frames, said second frames comprising blocks of information of the second digital information signal; signal combination means for inserting a second synchronisation signal and at least the data portion of a first frame into a second frame of the second digital information signal so as to obtain a composite frame; output means for supplying the composite frames to an output terminal so as to obtain a composite signal to be transmitted; characterized in that said signal combination means are adapted to strip the first synchronization signal from said first frames prior to inserting at least the data portion of the first frames into the second frames. 2. Transmitter as claimed in claim 1, characterized in that the signal combination means are adapted to insert the data portion of a first frame into a second frame of the second digital information signal by using buried data techniques. 3. Transmitter as claimed in claim 1 or 2, characterized in that a second frame represents a portion of the second digital information signal of a predefined duration and a first frame represents a portion of a third digital information signal of a substantially the same duration. 4. Transmitter as claimed in claim 3, characterized in that the first digital information signal is obtained by datacompression of the third digital information signal. 5. Transmitter as claimed in claim 4, characterized in that the first digital information signal is in the form of an MPEG encoded signal. 6. Transmitter as claimed in claim 4 or 5, charaterized in that the transmitter further comprises means for detecting the capacity available in a second frame to insert a first frame and generating a control signal for controlling the datacompression of the third digital information signal, said control signal being indicative for the capacity availabe in said second frame. 7. Transmitter as claimed in any of the preceding claims, characterized in that the second digital information signal comprises at least one PCM signal. 8. Transmitter as claimed in anyone of the preceding claims, the transmitter being in the form of an apparatus for recording the digital information signal on a record carrier. 9. Transmitter as claimed in anyone of the preceding claims, characterized in that the transmitter further comprises channel-encoding means for channel encoding the transmission signal prior to transmission. 10 Method of transmitting a first and second digital information signal via a transmission medium, said first digital information signal comprising first frames having at least a first synchronization signal and a data portion stored in them, the method comprising the steps: receiving the first and second digital information signal; processing the second digital information signal into subsequent second frames, said second frames comprising blocks of information of the second digital information signal; inserting a second synchronization signal and at least the data portion of a first frame into a second frame of the second digital information signal so as to obtain a composite frame; supplying the composite frames to an output terminal so as to obtain a composite signal to be transmitted; characterized in that method further comprises the step stripping the first synchronization signal from said first frames prior to inserting at least the data portion of said first frames into the second frames. 11. Method as claimed in claim 10, characterized in that the at least the data portion of a first frame is inserted into a second frame of the second digital information signal by using buried data techniques. 12. Method as claimed in claim 10 or 11, characterized in that a second frame represents a portion of the second digital information signal of a predefined duration and a first frame represents a portion of a third digital information signal of a substantially the same duration. 13. Method as claimed in claim 12, characterized in that the first digital information signal is obtained by datacompression of the third digital information signal. 14. Method as claimed in claim 13, characterized in that the first digital information signal is in the form of an MPEG encoded signal. 15. Transmission medium in the form of a record carrier carrying a composite signal comprising portions of a first and a second digital information signal, said composite signal being a sequence of composite frames, a composite frame comprises a second synchronization signal and a data portion of a first frame of the first digital information signal, said first frame comprises a first synchronization signal and a data portion, said composite frame being obtained by inserting the second synchronization pattern and at least the data portion of the first digital information signal into a second frame of the second digital information signal, a second frame being obtained by processing the second digital information signal into subsequent second frames, said second frames comprising blocks of information of the second digital information signal, characterized in that prior to inserting at least the data portion of a first frame the first synchronization signal is stripped from said first frame. 16. Transmission medium as claimed in claim 15, characterized in that at least the data portion of a first frame is inserted in a second frame by using buried data techniques. 17. Transmission medium as claimed in claim 15 or 16, characterized in that a second frame represents a portion of the second digital information signal of a predined duration and a first frame represents a portion of a third digital information signal of substantially the same duration. 18. Transmission medium as claimed in claim 17, characterized in that the first digital information signal is obtained by data compression of the third digital information signal. 19. Transmission medium as claimed in claim 15, 16, 17 or 18, wherein the record carrier is of the optical or magnetical recording type. 20. Receiver for receiving a composite signal and generating a first and a second digital information signal therefrom, the receiver comprising: receiving means for receiving the composite signal; first detection means for detecting a second synchronization signal so a to obtain a detection signal; retrieval means for retrieving a composite frame from the composite signal in response to said detection signal; first extraction means for extracting at least a data portion of a first frame of the first digital information signal from the composite frame; second extraction means for extracting at least a part of the second digital information signal from the composite frame so as to obtain a second frame of the second digital information signal; first output means for subsequently supplying the second frames to a second output terminal so as to obtain the second digital information signal; characterized in that the receiver further comprises: synchronization signal generator means for generating a first synchronization signal; signal combination means for combining the first synchronization signal and the at least the data portion of the first digital information signal so as to obtain a first frame of the first digital information signal; second output means for subsequently supplying the first frames of the first digital information signal to a first output terminal so as to obtain the first digital information signal. 21. Receiver as claimed in claim 20, characterized in that a second frame represents a portion of the second digital information signal of a predefined duration and a first frame represents a portion of a third digital information signal of a substantially the same duration. 22. Receiver as claimed in claim 20 or 21, characterized in that the first digital information signal is a data compressed version of the third digital information signal. 23. Receiver as claimed in claim 20, 21 or 22, characterized in that the first digital information signal is in the form of an MPEG encoded signal. 24. Receiver as claimed in claim 20, 21, 22 or 23, characterized in that the composite signal is a PCM signal and the second digital information signal is substantially the composite signal. 25. Receiver as claimed in any one of the claims 20 to 24, which receiving device takes the form of a device for reproducing a composite signal recorded on a record carrier. 26. Receiver as claimed in any one of the claims 20 to 25, characterized in that the receiver comprises channel decoding means accommodated immediately after the recieving means.