SYSTEM AND A METHOD OF PROCESSING AUDIO DATA, A PROGRAM ELEMENT AND A COMPUTER-READABLE MEDIUM

• US 20090182563A1
• Filed: 09/15/2005
• Published: 07/16/2009
• Est. Priority Date: 09/23/2004
• Status: Abandoned Application

• Current Assignee: Koninklijke Philips Electronics N.V. (Koninklijke Philips N.V.)
• Original Assignee: Koninklijke Philips Electronics N.V. (Koninklijke Philips N.V.)
• Inventors: Schobben, Daniel Willem E., Van De Par, Steven Leonardus J.D.
• Application Number:
  US11/575,510
• Publication Number:
  US 20090182563A1
• Time in Patent Office: Days
• US Class Current: 704/500
• CPC Class Codes: H04R 2420/05 Detection of connection of loudspeakers or headphones to amplifiers
• CPC Class Codes: H04R 5/04 Circuit arrangements, e.g. for selective connection of amplifier inputs/outputs to loudspeakers, for loudspeaker detection, or for adaptation of settings to personal preferences or hearing impairments combinations of amplifiers H03F3/68; stereophonic systems H04S
• CPC Class Codes: H04S 1/002 Non-adaptive circuits, e.g. manually adjustable or static, for enhancing the sound image or the spatial distribution control circuits for electronic adaptation of the sound field H04S7/30
• CPC Class Codes: H04S 1/005 For headphones
• CPC Class Codes: H04S 1/007 in which the audio signals are in digital form data reduction aspects thereof based on psychoacoustics G10L19/02
• CPC Class Codes: H04S 2420/01 Enhancing the perception of the sound image or of the spatial distribution using head related transfer functions [HRTF's] or equivalents thereof, e.g. interaural time difference [ITD] or interaural level difference [ILD]
• CPC Class Codes: H04S 2420/03 Application of parametric coding in stereophonic audio systems
• CPC Class Codes: H04S 7/305 Electronic adaptation of stereophonic audio signals to reverberation of the listening space H04S7/301 takes precedence
• CPC Class Codes: H04S 7/308 Electronic adaptation dependent on speaker or headphone connection

Abstract

A system (100) of processing audio data, comprising a decoding unit (102) and a determining unit (102, 106) having first determining means (102) and second determining means (106). The decoding unit (102) is adapted to decode encoded audio data to generate decoded audio data. The first determining means (102) is adapted to determine properties of the decoded audio data and/or of reproduction conditions under which the decoded audio data is to be reproduced, and the second determining means (106) is adapted to determine an amount of reverberation and/or of cross-talk to be added to the decoded audio data based on the determined properties of the decoded audio data and/or of the determined reproduction conditions under which the decoded audio data is to be reproduced.

Claims

1. A system (100) of processing audio data, comprising:

a decoding unit (102) adapted to decode encoded audio data to generate decoded audio data;

first determining means (102, 105) adapted to determine properties of the decoded audio data and/or of reproduction conditions under which the decoded audio data is to be reproduced;

second determining means (106) adapted to determine on the one hand an amount of reverberation and/or of cross-talk to be added to the decoded audio data based on the determined properties of the decoded audio data and/or on the other hand the determined reproduction conditions under which the decoded audio data is to be reproduced.

2. The system (100) according to claim 1,

wherein the decoding unit (102) comprises a decompression unit adapted to decompress compressed audio data to generate the decoded audio data.

3. The system (100) according to claim 2,

wherein the decompression unit is adapted to decompress compressed audio data having an MP3 format.

4. The system (100) according to claim 1,

wherein the first determining means (102, 105) are adapted such that the properties of the decoded audio data, based on which an amount of reverberation and/or of cross-talk to be added to the decoded audio data is determined, include a quality parameter indicating the quality of the decoded audio data.

5. The system (100) according to claim 4,

wherein the quality parameter is the bit-rate of the audio data.

6. The system (100) according to claim 4,

wherein the quality parameter is derived from the amount and/or the distribution of spectral holes in the audio data.

7. The system (100) according to claim 1,

wherein the first determining means (102) are adapted such that the properties of the decoded audio data, based on which an amount of reverberation and/or of cross-talk to be added to the decoded audio data is determined, include the nature of the decoded audio data.

8. The system (100) according to claim 1,

wherein the first determining means (102, 105) are adapted such that the properties of the decoded audio data, based on which an amount of reverberation and/or of cross-talk to be added to the decoded audio data is determined, include the fact whether a mid-side coding is included in the decoded audio data.

9. The system (100) according to claim 1,

wherein the first determining means (102, 105) are adapted such that the properties of the decoded audio data, based on which an amount of reverberation and/or of cross-talk to be added to the decoded audio data is determined, include an audio bandwidth of the decoded audio data.

10. The system (100) according to claim 1,

wherein the first determining means (102, 105) are adapted such that the properties of the decoded audio data, based on which an amount of reverberation and/or of cross-talk to be added to the decoded audio data is determined, include the fact whether a variable bit-rate is present in the decoded audio data.

11. The system (100) according to claim 1,

wherein the first determining means (102, 105) are adapted such that the properties of the decoded audio data, based on which an amount of reverberation and/or of cross-talk to be added to the decoded audio data is determined, include a time-varying bit stream parameter of the decoded audio data.

12. The system (100) according to claim 1,

wherein the first determining means (102, 105) are adapted such that the reproduction conditions under which the decoded audio data is to be reproduced, based on which an amount of reverberation and/or of cross-talk to be added to the decoded audio data is determined, include the type of reproduction apparatus (214) by which the decoded audio data is to be reproduced.

13. The system (100) according to claim 12,

wherein the first determining means (102, 105) are adapted such that the reproduction conditions under which the decoded audio data is to be reproduced, based on which an amount of reverberation and/or of cross-talk to be added to the decoded audio data is determined, include the fact whether the decoded audio data is to be reproduced by a loudspeaker or by a headphone (214).

14. The system (100) according to claim 1,

wherein the first determining means (102, 105) are adapted such that the reproduction conditions under which the decoded audio data is to be reproduced, based on which an amount of reverberation and/or of cross-talk to be added to the decoded audio data is determined, include the amount of natural reverberation of an environment in which the decoded audio data is to be reproduced.

15. The system (100) according to claim 1,

wherein the second determining means (102, 105) are adapted to determine an amplitude and/or a decay time of reverberation to be added to the decoded audio data.

16. The system (100) according to claim 1,

comprising an adding unit (109) adapted to add the amount of reverberation and/or of cross-talk determined by the second determining means (106) to the decoded audio data to generate output audio data.

17. The system (100) according to claim 16,

comprising a headphone (214) connected to the adding unit (109), the headphone (214) being adapted to generate and emit acoustic waves based on the output audio data.

18. The system (100) according to claim 1,

realized as an integrated circuit.

19. The system (100) according to claim 1,

realized as a portable audio player or as a DVD player or as an MP3 player or as an internet radio device.

20. A method of processing audio data,

comprising the steps of:

decoding encoded audio data to generate decoded audio data;

determining properties of the decoded audio data and/or of reproduction conditions under which the decoded audio data is to be reproduced, and determining on the one hand an amount of reverberation and/or of cross-talk to be added to the decoded audio data based on the determined properties of the decoded audio data and/or on the other hand of the determined reproduction conditions under which the decoded audio data is to be reproduced.

21. The method according to claim 20,

wherein the amount of reverberation and/or of cross-talk to be added to the decoded audio data is determined dynamically.

22. A program element, which, when being executed by a processor, is adapted to carry out a method of processing audio data comprising the steps of:

decoding encoded audio data to generate decoded audio data;

determining properties of the decoded audio data and/or of reproduction conditions under which the decoded audio data is to be reproduced, and determining on the one hand an amount of reverberation and/or of cross-talk to be added to the decoded audio data based on the determined properties of the decoded audio data and/or on the other hand of the determined reproduction conditions under which the decoded audio data is to be reproduced.

23. A computer-readable medium, in which a computer program is stored which, when being executed by a processor, is adapted to carry out a method of processing audio data comprising the steps of:

decoding encoded audio data to generate decoded audio data;

determining properties of the decoded audio data and/or of reproduction conditions under which the decoded audio data is to be reproduced, and determining on the one hand an amount of reverberation and/or of cross-talk to be added to the decoded audio data based on the determined properties of the decoded audio data and/or on the other hand of the determined reproduction conditions under which the decoded audio data is to be reproduced.