Directional coding conversion

Patent metadata

Field	Value
Publication number	US-9489953-B2
Application number	US-201414295841-A
Country	US
Kind code	B2
Filing date	Jun 4, 2014
Priority date	Jun 11, 2013
Publication date	Nov 8, 2016
Grant date	Nov 8, 2016

Abstract

A directional coding conversion method and system includes receiving input audio signals that comprise directional audio coded signals into which directional audio information is encoded according to a first loudspeaker setup and extracting the directional audio coded signals from the received input audio signals. The method and system further includes decoding, according to the first loudspeaker setup, the extracted directional audio coded signals to provide at least one absolute audio signal and corresponding absolute directional information and processing the at least one absolute audio signal and the absolute directional information to provide first output audio signals coded according to a second loudspeaker setup.

First claim

What is claimed is:

1. A directional coding conversion method comprising:
receiving input audio signals that comprise directional audio coded signals into which directional audio information is encoded according to a first loudspeaker setup;
extracting the directional audio coded signals from the received input audio signals;
decoding, according to the first loudspeaker setup, the extracted directional audio coded signals to provide at least one absolute audio signal and corresponding absolute directional information;
processing the at least one absolute audio signal and the absolute directional information to provide first output audio signals that are coded according to a second loudspeaker setup;
extracting first signals other than the directional audio coded signals from the received input audio signals;
processing the first signals other than the directional audio coded signals to provide second output audio signals; and
mixing the first output audio signals with the second output audio signals to provide loudspeaker signals for the second loudspeaker setup.

2. The method of claim 1 , wherein extracting the directional audio coded signals from the received input audio signals comprises band-pass filtering.

3. The method of claim 1 , wherein directional encoding comprises at least one of scaling, normalizing or threshold comparison.

4. The method of claim 1 , wherein processing the first signals other than the directional audio coded signals comprises directionally encoding, according to the second loudspeaker setup, the first signals other than the directional audio coded signals with given directional information to provide the second output audio signals.

5. The method of claim 4 , further comprising using the first signals other than the directional audio coded signals as the at least one absolute audio signal and the directional information to provide the first output audio signals if no directional audio coded signals from the received input audio signals are extracted.

6. The method of claim 1 , wherein processing the first signals other than the directional audio coded signals comprises calculating mean values of the first signals other than the directional audio coded signals to provide gain control signals that control the gain of the second output audio signals for the second loudspeaker setup.

7. The method of claim 1 , wherein extracting the first signals other than the directional audio coded signals from the received input audio signals comprises bandpass filtering.

8. A directional coding conversion system comprising:
input lines configured to receive input audio signals that comprise directional audio coded signals into which directional audio information is encoded according to a first loudspeaker setup;
an extractor block configured to extract the directional audio coded signals from the received input audio signals, wherein the extractor block is further configured to extract first signals other than the directional audio coded signals from the received input audio signals;
a decoder block configured to decode, according to the first loudspeaker setup, the extracted directional audio coded signals to provide at least one absolute audio signal and corresponding absolute directional information;
a first processor block configured to process the at least one absolute audio signal and the absolute directional information to provide first output audio signals that are coded according to a second loudspeaker setup;
a second processor block configured to process the first signals other than the directional audio coded signals to provide second output audio signals; and
a mixer block configured to mix the first output audio signals with the second output audio signals to provide loudspeaker signals for the second loudspeaker setup.

9. The system of claim 8 , wherein the extracting block comprises a band-pass filtering block.

10. The system of claim 8 , wherein the second processor block is configured to calculate mean values of the first signals other than the directional audio coded signals to provide gain control signals that control the gain of the second output audio signals for the second loudspeaker setup.

11. The system of claim 8 , wherein the second processor block comprises a directional encoding block configured to encode, according to the second loudspeaker setup, the first signals other than the directional audio coded signals with given directional information to provide the second output audio signals.

12. The system of claim 11 , wherein the first processor block is configured to use the first signals other than the directional audio coded signals as the at least one absolute audio signal and the absolute directional information to provide the first output audio signals for the second loudspeaker setup if no directional audio coded signals from the received input audio signals are extracted.

13. The system of claim 11 , wherein the directional encoding block is configured to perform at least one of scaling, norming or threshold comparison.

14. A system for performing directional coding conversion, the system comprising:
an extractor block configured to extract directional audio coded signals from input audio signals as received at input lines, the directional audio coded signals including directional audio information that is encoded according to a first loudspeaker setup, wherein the extractor block is further configured to extract first signals other than the directional audio coded signals from the received input audio signals;
a decoder block configured to decode, according to the first loudspeaker setup, the extracted directional audio coded signals to provide at least one absolute audio signal and corresponding absolute directional information;
a first processor block configured to process the at least one absolute audio signal and the absolute directional information to provide first output audio signals that are coded according to a second loudspeaker setup;
a second processor block configured to process the first signals other than the directional audio coded signals to provide second output audio signals; and
a mixer block configured to mix the first output audio signals with the second output audio signals to provide loudspeaker signals for the second loudspeaker setup.

15. The system of claim 14 , wherein the extracting block comprises a band-pass filtering block.

16. The system of claim 14 , wherein the second processor block is configured to calculate mean values of the first signals other than the directional audio coded signals to provide gain control signals that control the gain of the second output audio signals for the second loudspeaker setup.

17. The system of claim 14 , wherein the second processor block comprises a directional encoding block configured to encode, according to the second loudspeaker setup, the first signals other than the directional audio coded signals with given directional information to provide the second output audio signals.

Assignees

• Harman Becker Automotive Systems Gmbh

Inventors

• Christoph Markus
• Wolf Florian

Classifications

• H04R2499/13

  Acoustic transducers and sound field adaptation in vehicles · CPC title

• G10L19/167

  Audio streaming, i.e. formatting and decoding of an encoded audio signal representation into a data stream for transmission or storage purposes · CPC title

• H04S7/30

  Control circuits for electronic adaptation of the sound field · CPC title

• H04S3/02

  of the matrix type, i.e. in which input signals are combined algebraically, e.g. after having been phase shifted with respect to each other · CPC title

• H04S3/008

  in which the audio signals are in digital form, i.e. employing more than two discrete digital channels (data reduction aspects thereof based on psychoacoustics G10L19/02) · CPC title