System and method for enhanced streaming audio

• US 7,987,281 B2
• Filed: 10/02/2007
• Issued: 07/26/2011
• Est. Priority Date: 12/10/1999
• Status: Expired due to Fees

• Current Assignee: DTS, Inc. (Xperi Inc.)
• Original Assignee: SRS Labs Incorporated (Xperi Inc.)
• Inventors: Cortright, Charles R. Jr., Claar, Jeffrey M., Kraemer, Alan D., Yuen, Thomas C. K.
• Primary Examiner(s): Lin; Kenny S
• Assistant Examiner(s): LI, GUANG W
• Application Number:
  US11/866,327
• Publication Number:
  US 20080022009A1
• Time in Patent Office: 1,393 Days
• Field of Search: 709/231
• US Class Current: 709/231
• CPC Class Codes: H04S 2400/01 Multi-channel, i.e. more than two input channels, sound reproduction with two speakers wherein the multi-channel information is substantially preserved
• CPC Class Codes: H04S 3/002 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 7/307 Frequency adjustment, e.g. tone control H04S7/301 takes precedence

Abstract

A system and method for enhancement and management of streaming audio is disclosed. In one embodiment, the system provides a client-side decoder that is compatible with numerous audio formats, so that a user can enjoy relatively high-quality audio from various sources, even from sources that do not provide multi-channel or high-quality audio data. The system and method also include a management system for managing and controlling the use of licensed signal processing software to further enhance an audio stream. In one embodiment, the management system is used to manage a signal processing module that provides psychoacoustic audio processing to create a wider soundstage, an acoustic correction process to increase the perceived height and clarity of the audio image, and bass enhancement processing to create the perception of low bass from the small speakers or headphones typically used with multi-media systems and portable audio players.

Claims

1. A method of enhancing a surround-sound audio signal delivered over a network, the method comprising:

receiving streaming audio at a client location;

converting the streaming audio into at least two channels of receive audio; and

enhancing the at least two channels of receive audio for playback by the client with one or more processors, said enhancing comprising;

correcting a perceived height of an apparent sound stage associated with the at least two channels of receive audio by at least applying one or more high pass filters to the at least two channels of receive audio to create vertically-corrected audio;

enhancing a bass response associated with the vertically-corrected audio to produce vertically-corrected and bass-enhanced audio, said enhancing the bass response comprising;

filtering the at least two channels of receive audio at a first bass frequency with a first band pass filter;

filtering the at least two channels of receive audio at a second bass frequency with at least a second band pass filter, wherein the second bass frequency is different than the first bass frequency; and

filtering the at least two channels of receive audio at a third bass frequency with a third band pass filter, wherein the third bass frequency is different than the first and second bass frequencies; and

correcting a perceived width of the apparent sound stage of the vertically-corrected and bass-enhanced audio by at least equalizing a difference signal present in the vertically-corrected and bass-enhanced audio such that lower and higher difference signal frequencies are boosted relative to mid-band difference signal frequencies between the lower and higher difference signal frequencies.

2. The method of claim 1, wherein the client represents an individual personal computer user.

3. The method of claim 1, further comprising decoding the at least two channels of receive audio into a 5.1 channel audio output signal.

4. The method of claim 3, wherein that said enhancing the at least two channels of receive audio comprises enhancing the 5.1 channel audio output signal.

5. The method of claim 4, wherein said decoding comprises decoding using a Circle Surround 5.1 decoder.

6. An apparatus for enhancing a surround-sound audio signal delivered over a network, the apparatus comprising:

a receiver configured to receive streaming audio at a client location;

a converter configured to convert the streaming audio into at least two channels of receive audio;

a sound enhancement system comprising one or more processors, the sound enhancement system configured to enhance the at least two channels of receive audio for playback by the client, the sound enhancement system comprising;

an image correction module configured to correct a perceived height of an apparent sound stage associated with the at least two channels of receive audio by at least applying one or more high pass filters to the at least two channels of receive audio to create vertically-corrected audio;

a bass enhancement module configured to enhance a bass response associated with the at least two channels of receive audio, the bass enhancement module comprising;

a first band pass filter configured to filter the at least two channels of receive audio at a first bass frequency;

a second band pass filter configured to filter the at least two channels of receive audio at a second bass frequency, wherein the second bass frequency is different than the first bass frequency; and

a third band pass filter configured to filter the at least two channels of receive audio at a third bass frequency, wherein the third bass frequency is different than the first and second frequencies; and

an image enhancement module configured to enhance a perceived width of the apparent sound stage associated with the at least two channels of receive audio by at least equalizing a difference signal associated with the at least two channels of receive audio such that lower and higher difference signal frequencies are boosted relative to mid-band difference signal frequencies between the lower and higher difference signal frequencies.

7. The apparatus of claim 6, wherein the client represents an individual personal computer user.

8. The apparatus of claim 6, further comprising a decoder configured to decode the at least two channels of receive audio into a 5.1 channel audio output signal.

9. The apparatus of claim 8, wherein the sound enhancement system is further configured to enhancing the at least two channels of receive audio by at least enhancing the 5.1 channel audio output signal.

10. The apparatus of claim 9, wherein said decoding comprises decoding using a Circle Surround 5.1 decoder.

11. An apparatus for enhancing a surround-sound audio signal delivered over a network, the apparatus comprising:

means for receiving streaming audio at a client location;

means for converting the streaming audio into at least two channels of receive audio; and

means for enhancing the at least two channels of receive audio for playback by the client with one or more processors, said means for enhancing comprising;

means for correcting a perceived height of an apparent sound stage associated with the at least two channels of receive audio by at least applying one or more high pass filters to the at least two channels of receive audio to create vertically-corrected audio;

means for enhancing a bass response associated with the at least two channels of receive audio comprising;

means for filtering the at least two channels of receive audio at a first bass frequency with a first band pass filter;

means for filtering the at least two channels of receive audio at a second bass frequency with at least a second band pass filter, wherein the second bass frequency is different than the first bass frequency; and

means for filtering the at least two channels of receive audio at a third bass frequency with a third band pass filter, wherein the third bass frequency is different than the first and second frequencies; and

means for correcting a perceived width of the apparent sound stage associated with the at least two channels of receive audio by at least equalizing a difference signal associated with the at least two channels of receive audio such that lower and higher difference signal frequencies are boosted relative to mid-band difference signal frequencies between the lower and higher difference signal frequencies.

12. The apparatus of claim 11, wherein the client represents an individual personal computer user.

13. The apparatus of claim 11, further comprising means for decoding the at least two channels of receive audio into a 5.1 channel audio output signal.

14. The apparatus of claim 13, wherein said means for enhancing the at least two channels of receive audio is further configured to enhancing the 5.1 channel audio output signal.

15. The apparatus of claim 14, wherein said means for decoding is further configured to decode the at least two channels of receive audio using a Circle Surround 5.1 decoder.