System and method for enhanced streaming audio

• US 7,277,767 B2
• Filed: 12/11/2000
• Issued: 10/02/2007
• Est. Priority Date: 12/10/1999
• Status: Active Grant

• Current Assignee: DTS, Inc. (Adeia Inc.)
• Original Assignee: SRS Labs Incorporated (Adeia Inc.)
• Inventors: Kraemer, Alan D., Yuen, Thomas C. K., Cortright, Charles R. Jr., Claar, Jeffrey M.
• Primary Examiner(s): Tran; Sinh
• Assistant Examiner(s): Flanders; Andrew C
• Application Number:
  US09/734,475
• Publication Number:
  US 20020129151A1
• Time in Patent Office: 2,486 Days
• Field of Search: 381/1, 381/119, 381/20, 381/22, 381/310, 381/80, 700/94, 704/500, 704/501, 709/217, 709/219, 709/231
• US Class Current: 700/94
• 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 delivering a surround-sound audio signal over the Internet to a client using Internet stereo sound streaming techniques, the method comprising:

providing a 5.1 channel audio input signal at an Internet broadcast location;

encoding the 5.1 channel audio input signal into two channels of transmit audio;

converting the two channels of transmit audio into a streaming format for transmission over the Internet;

transmitting the streaming format to a client location;

reconverting the streaming format into two channels of receive audio;

decoding the two channels of receive audio into a 5.1 channel audio output signal;

processing the 5.1 channel audio output signal into a two-channel audio output signal, wherein the two-channel audio output signal is configured to simulate 5.1 channel audio when played on a pair of loudspeakers; and

enhancing the two-channel audio output signal for playback by the client, said enhancing comprising;

correcting a perceived height of an apparent sound stage associated with the two-channel audio output signal;

enhancing a bass response associated with the two-channel audio output signal comprising;

filtering the two-channel audio output signal at a first frequency with a first band pass filter;

filtering the two-channel audio output signal at a second frequency with at least a second band pass filter, wherein the second frequency is different than the first frequency; and

filtering the two-channel audio output signal at a third frequency with a third band pass filter, wherein the third frequency is different than the first and second frequencies; and

correcting a perceived width of the apparent sound stage associated with the two-channel audio output signal.

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

3. The method of claim 1 wherein encoding comprises encoding using a Circle Surround 5.1 encoder.

4. The method of claim 1 wherein decoding comprises decoding using a Circle Surround 5.1 decoder.

5. The method of claim 1 wherein providing a 5.1 channel audio input signal comprises providing a Circle Surround encoded 5.1 audio input signal.

6. The method of claim 1 further comprising:

determining whether the Internet location is a licensed broadcast location prior to processing the 5.1 channel audio output signal into the two-channel audio output signal and prior to enhancing the two-channel audio output signal; and

permitting the processing of the 5.1 channel audio output signal into the two-channel audio output signal and the enhancing of the two-channel audio output signal when the Internet location is a licensed broadcast location.

7. The method of claim 1 further comprising downloading to the client location a browser interface comprising audio enhancement.

8. An apparatus for delivering a surround-sound audio signal over the Internet to a client using Internet stereo sound streaming techniques, the apparatus comprising:

an encoder to encode a 5.1 channel audio input signal at an Internet broadcast location into two channels of transmit audio;

a first converter to convert the two channels of transmit audio into a streaming format for transmission over the Internet;

a transmitter to transmit the streaming format to a client location;

a second converter to reconvert the streaming format into two channels of receive audio;

a decoder to decode the two channels of receive audio into a 5.1 channel audio output signal;

a processor to process the 5.1 channel audio output signal into a two-channel audio output signal, wherein the two-channel audio output signal is configured to simulate 5.1 channel audio when played on a pair of loudspeakers;

a sound enhancement system to enhance the two-channel audio output signal for playback by the client, the sound enhancement system comprising;

an image correction module to correct a perceived height of an apparent sound stage associated with the two-channel audio output signal;

a bass enhancement module to enhance a bass response associated with the two-channel audio output signal comprising;

a first band pass filter that filters the two-channel audio output signal at a first frequency;

a second band pass filter that filters the two-channel audio output signal at a second frequency, wherein the second frequency is different than the first frequency; and

a third band pass filter that filters the two-channel audio output signal at a third frequency, wherein the third frequency is different than the first and second frequencies; and

an image enhancement module to enhance a perceived width of the apparent sound stage associated with the two-channel audio output signal.

9. The apparatus of claim 8 wherein the client represents an individual personal computer user.

10. The apparatus of claim 8 wherein the encoder comprises a Circle Surround 5.1 encoder.

11. The apparatus of claim 8 wherein the decoder comprises a Circle Surround 5.1 decoder.

12. The apparatus of claim 8 wherein the 5.1 channel audio input signal comprises a Circle Surround encoded 5.1 audio input signal.

13. The apparatus of claim 8 further comprising a licensed broadcast location, wherein the 5.1 channel audio output signal is processed into the two-channel audio output signal and the two-channel audio output signal is enhanced when the Internet location is a licensed broadcast location.

14. The apparatus of claim 8 further comprising a browser interface comprising audio enhancement at the client location.

15. An apparatus for delivering a surround-sound audio signal over the Internet to a client using Internet stereo sound streaming techniques, the apparatus comprising:

means for encoding a 5.1 channel audio input signal into two channels of transmit audio;

means for converting the two channels of transmit audio into a streaming format for transmission over the Internet;

means for transmitting the streaming format to a client location;

means for reconverting the streaming format into two channels of receive audio;

means for decoding the two channels of receive audio into a 5.1 channel audio output signal;

means for processing the 5.1 channel audio output signal into a two-channel audio output signal, wherein the two-channel audio output signal is configured to simulate 5.1 channel audio when played on a pair of loudspeakers; and

means for enhancing the two-channel audio output signal for playback by the client, said enhancing comprising;

means for correcting a perceived height of an apparent sound stage associated with the two-channel audio output signal;

means for enhancing a bass response associated with the two-channel audio output signal comprising;

means for filtering the two-channel audio output at a first frequency;

means for filtering the two-channel audio output at a second frequency, wherein the second frequency is different than the first frequency; and

means for filtering the two-channel audio output at a third frequency, wherein the third frequency is different than the first and second frequencies; and

means for correcting a perceived width of the apparent sound stage associated with the two-channel audio output signal.

16. The apparatus of claim 15 wherein the client represents an individual personal computer user.

17. The apparatus of claim 15 wherein the means for encoding comprises a means for Circle Surround 5.1 encoding.

18. The apparatus of claim 15 wherein the means for decoding comprises a means for Circle Surround 5.1 decoding.

19. The apparatus of claim 15 wherein the 5.1 channel audio input signal comprises a Circle Surround encoded 5.1 audio input signal.

20. The apparatus of claim 15 further comprising:

a means for determining whether the Internet location is a licensed broadcast location prior to processing the 5.1 channel audio output signal into the two-channel audio output signal and prior to enhancing the two-channel audio output signal; and

a means for permitting the processing of the 5.1 channel audio output signal into the two-channel audio output signal and the enhancing of the two-channel audio output signal when the Internet location is a licensed broadcast location.