Record carrier having an encoded wide-band digital audio signal recorded thereon

• US 7,565,298 B2
• Filed: 12/08/2004
• Issued: 07/21/2009
• Est. Priority Date: 06/02/1989
• Status: Expired due to Fees

• Current Assignee: TDF SAS (Fluor Corporation)
• Original Assignee: Koninklijke Philips Electronics N.V. (Koninklijke Philips N.V.)
• Inventors: Stoll, Gerhard Josef, Theile, Gunther, Lokhoff, Gerardus C. P., Dehery, Yves-Francois
• Primary Examiner(s): MCFADDEN, SUSAN IRIS
• Application Number:
  US11/007,377
• Publication Number:
  US 20060206341A1
• Time in Patent Office: 1,686 Days
• Field of Search: 704/500
• US Class Current: 704/500
• CPC Class Codes: G10L 19/0204 using subband decomposition
• CPC Class Codes: G11B 20/00007 Time or data compression or expansion audio compression based on psychoacoustics G10L19/00; data processing for reproducing audio data at different playback speeds G10L21/04; video compression H04N19/00; data compression per se H03M7/30
• CPC Class Codes: G11B 20/00086 Circuits for prevention of unauthorised reproduction or copying, e.g. piracy indicating unauthorised use of record carriers in general G11B23/28; scrambling for television signal recording H04N5/913; network architectures or network protocols for network security H04L63/00; cryptographic mechanisms or cryptographic arrangements for secret or secure communication H04L9/00
• CPC Class Codes: G11B 20/10 Digital recording or reproducing
• CPC Class Codes: G11B 20/10527 Audio or video recording; Data buffering arrangements G11B20/12 - G11B20/18 take precedence
• CPC Class Codes: G11B 20/12 Formatting, e.g. arrangement of data block or words on the record carriers within interface between computers and data recorders G06F3/06
• CPC Class Codes: G11B 2020/10592 specifically adapted for recording or reproducing multichannel signals
• CPC Class Codes: G11B 2020/10601 surround sound signal
• CPC Class Codes: G11B 2220/90 Tape-like record carriers
• CPC Class Codes: G11B 2220/913 Digital audio tape [DAT] format
• CPC Class Codes: G11B 2220/93 Longitudinal format, wherein tracks are in the direction of the tape, read with a static head, e.g. DCC
• CPC Class Codes: G11B 27/3027 used signal is digitally coded
• CPC Class Codes: H04B 1/665 using psychoacoustic properties of the ear, e.g. masking effect
• CPC Class Codes: H04B 1/667 using a division in frequency subbands for TV signals H04N19/63
• CPC Class Codes: H04H 20/88 Stereophonic broadcast systems multiplex system in general H04J
• CPC Class Codes: H04H 40/27 specially adapted for broadcast systems covered by groups H04H20/53 - H04H20/95

Abstract

Reproduction accuracy of a digital signal, representing, for example, stereo audio signals, is improved by transmitting sample data which have been encoded to form transmission signals. The stereo audio signals are coded into sub(band) signals. Corresponding sub(band) signals of the stereo audio signals may be processed to obtain composite sub(band) signals, which are recorded on a record carrier. To identify whether corresponding sub(band) signals have been processed or not, a mode indicator control signal, indicating whether a corresponding sub signal of the at least two signal components have or have not been processed into a composite sub-signal, is also being recorded on the record carrier.

Claims

1. A computer-readable storage medium having an encoded wide-band digital audio signal recorded on it, the wide-band digital audio signal comprising at least a first and a second signal component, the at least first and second signal components being filtered into sub-signals for the at least first and second signal components, a sub-signal comprising sample information,

the computer-readable storage medium having recorded thereon sub-signals of the at least first and second signal components that have not been processed into a composite sub-signal, and further, a mode indicator control signal, indicating whether a corresponding sub-signal of the at least first and second signal components have or have not been processed into a composite sub-signal, also being recorded on the computer-readable storage medium.

2. The computer-readable storage medium as claimed in claim 1, characterized in that further a sub-signal indicator control signal, indicating which at least one corresponding sub-signal of the at least first and second signal components have been processed, also is recorded on the computer-readable storage medium.

3. The computer-readable storage medium as claimed in claim 1, characterized in that, if the mode indicator control signal indicates that a corresponding sub-signal of the at least first and second signal components have been processed, the composite sub-signal obtained from processing said corresponding sub-signals of the at least first and second signal components also is recorded on the computer-readable storage medium.

4. The computer-readable storage medium as claimed in claim 1, wherein a sub-signal also comprises scale factor information in addition to the sample information,

characterized in that, if the mode indicator control signal indicates that a corresponding sub-signal of the at least first and second signal components have been processed into a composite sub-signal, the composite sub-signal obtained from processing said corresponding sub-signals of the at least first and second signal components also is recorded on the computer-readable storage medium, as well as information representative of the respective scale factors of all the sub-signals of the at least first and second signal components.

5. The computer-readable storage medium as claimed in claim 1, characterized in that the mode indicator control signal is a 2-bit signal, where the bit combination ‘

01’

indicates that the corresponding sub-signal of the at least first and second signal components have been processed.

6. The computer-readable storage medium as claimed in claim 5, characterized in that the bit combination ‘

00’

indicates that no sub-signals have been processed into composite sub signals.

7. The computer-readable storage medium as claimed in claim 2, characterized in that the sub-signal indicator control signal indicates which m₁ corresponding sub-signals of the at least first and second signal components have been processed, where m₁ is larger than 1.

8. The computer-readable storage medium as claimed in claim 7, characterized in that m₁ can vary over time.

9. The computer-readable storage medium as claimed in claim 7, the m₁ sub-signals are the signals corresponding to the highest frequency bands in the frequency range of the wide-band digital audio signal.

10. The computer-readable storage medium as claimed in claim 9, characterized in that the sub-signal indicator control signal is a 2-bit signal.

11. The computer-readable storage medium as claimed in claim 10, characterized in that the bit combination ‘

11’

indicates a predetermined value for m₁, and the bit combination ‘

10’

indicates a value for m₁ which equals the value for m₁ with the bit combination ‘

11’

plus 4.

12. The computer-readable storage medium as claimed in claim 11, characterized in that the bit combination ‘

01’

indicates a value for m₁ which is the value for m₁ with the bit combination ‘

11’

plus 8.

13. The computer-readable storage medium as claimed in claim 12, characterized in that the bit combination ‘

00’

indicates a value for m₁ which is the value for m₁ with the bit combination ‘

11’

plus 12.

14. The computer-readable storage medium as claimed in claim 11, characterized in that the value for m₁ with the bit combination ‘

11’

is 16.

15. The computer-readable storage medium as claimed in claim 2, characterized in that, if the mode indicator control signal indicates that a corresponding sub-signal of the at least first and second signal components have been processed, the composite sub-signal obtained from processing said corresponding sub-signals of the at least first and second signal components also is recorded on the computer-readable storage medium.

16. The computer-readable storage medium as claimed in claim 2, wherein a sub-signal also comprises scale factor information in addition to the sample information,

characterized in that, if the mode indicator control signal indicates that a corresponding sub-signal of the at least first and second signal components have been processed into a composite sub-signal, the composite sub-signal obtained from processing said corresponding sub-signals of the at least first and second signal components also is recorded on the computer-readable storage medium, as well as information representative of the respective scale factors of all the sub-signals of the at least first and second signal components.

17. The computer-readable storage medium as claimed in claim 9, the m₁ sub-signals are the signals corresponding to the highest frequency bands in the frequency range of the wide-band digital audio signal.

18. The computer-readable storage medium as claimed in claim 17, characterized in that the sub-signal indicator control signal is a 2-bit signal.

19. The computer-readable storage medium as claimed in claim 18, characterized in that the bit combination ‘

11’

indicates a predetermined value for m₁, and the bit combination ‘

10’

indicates a value for m₁ which equals the value for m₁ with the bit combination ‘

11’

plus 4.

20. The computer-readable storage medium as claimed in claim 19, characterized in that the bit combination ‘

01’

indicates a value for m₁ which is the value for m₁ with the bit combination ‘

11’

plus 8.

21. The computer-readable storage medium as claimed in claim 20, characterized in that the bit combination ‘

00’

indicates a value for m₁ which is the value for m₁ with the bit combination ‘

11’

plus 12.

22. The computer-readable storage medium as claimed in claim 19, characterized in that the value for m₁ with the bit combination ‘

11’

is 16.