Method for decoding digital audio with error recognition

• US 7,080,006 B1
• Filed: 11/07/2000
• Issued: 07/18/2006
• Est. Priority Date: 12/08/1999
• Status: Expired due to Fees

• Current Assignee: Robert Bosch GmbH
• Original Assignee: Robert Bosch GmbH
• Inventors: Klein Middelink, Marc, Mlasko, Torsten, Kupferschmidt, Claus
• Primary Examiner(s): Lerner, Martin
• Application Number:
  US10/149,317
• Time in Patent Office: 2,079 Days
• Field of Search: 704/200.1, 704/224, 704/226, 704/228, 704/229, 704/206, 704/500, 714/745, 714/746, 714/747
• US Class Current: 704/200.1
• CPC Class Codes: G10L 19/005 Correction of errors induced by the transmission channel, if related to the coding algorithm
• CPC Class Codes: H04H 2201/20 digital audio broadcasting [DAB]

Abstract

A method is provided for the decoding of digital audio data, which is used to perform an error recognition dependent on transmitted reference values, e.g., scale factors. The method includes the comparison of reference values of a subband with preceding reference values of the same subband, in order to produce a characteristic that is compared with a threshold value, and that, if the characteristic is located above the predetermined threshold value, this is indicated by a signaling. In an example embodiment of the present invention, it is provided that in subbands in which no audio data are transmitted a default value is entered, which leads to the result that no characteristic is produced for this subband.

Claims

1. A method for decoding digital audio data, comprising:

receiving digital audio data in at least one frame;

decoding the digital audio data, wherein during the decoding, scale factors are taken from the current and past frames in the decoding, which are dependent on the digital audio data, so as to generate a characteristic with the aid of the scale factors;

comparing the characteristic with a predetermined threshold value; and

indicating a first error detection by a signaling when the characteristic lies above the predetermined threshold value, wherein the characteristic is generated using a mean value formation by the scale factor having at least one preceding scale factor and a second error detection is performed on the scale factors using a checksum and the first and the second error detection are connected using a logical OR operation in order to detect an error.

2. The method according to claim 1, wherein the digital audio data are subdivided into successive subbands, the digital audio data for each subband being denormed using at least one reference value for the respective subband, and wherein the at least one reference value for the respective subband is compared with at least one preceding reference value for the respective subband to produce the characteristic.

3. The method according to claim 2, wherein the signaling is indicated by a bit sequence as a flag.

4. The method according to claim 3, wherein the bit sequence is compared with a frame for the error recognition.

5. The method according to claim 4, wherein the error recognition is performed for each frame.

6. The method according to claim 5, wherein the at least one frame has a frame head, a field for the error recognition of the at least one frame, a field for a bit allocation, a field for a selection of the reference values, a field for the reference values, a field for the digital audio data, and an additional data field.

7. The method according to claim 6, wherein the additional data field has data for the error recognition for the reference values.

8. The method according to claim 7, wherein an MPEG-1 layer II frame is used as the at least one frame.

9. The method according to claim 2, wherein if, in the at least one subband, a default value is entered as the at least one reference value, the default value is not subjected to comparison with the at least one preceding reference value.

10. The method according to claim 9, wherein the default value is chosen such that the comparison with the at least one preceding reference value results in the characteristic to lie under the predetermined threshold value.