Distributed processing of audio signals

• US 5,566,238 A
• Filed: 12/20/1994
• Issued: 10/15/1996
• Est. Priority Date: 11/24/1993
• Status: Expired due to Term

• Current Assignee: Intel Corporation
• Original Assignee: Intel Corporation
• Inventors: Marshall, Robert A., Wagner, Larry
• Primary Examiner(s): Zele, Krista M.
• Assistant Examiner(s): Saint Surin, Jacques M.
• Application Number:
  US08/360,134
• Time in Patent Office: 665 Days
• Field of Search: 379/389, 379/390, 379/391, 379/202, 379/162, 379/406, 379/388, 395/800, 395/162
• US Class Current: 379/388.02
• CPC Class Codes: G06T 1/00 General purpose image data processing
• CPC Class Codes: G06T 2200/16 involving adaptation to the client's capabilities
• CPC Class Codes: H04L 12/1813 for computer conferences, e.g. chat rooms instant messaging H04L51/04; protocols for multimedia communication H04L65/1101; arrangements for multi-party communication H04L65/403; telephonic conference arrangements H04M3/56; television conference systems H04N7/15
• CPC Class Codes: H04L 12/1822 Conducting the conference, e.g. admission, detection, selection or grouping of participants, correlating users to one or more conference sessions, prioritising transmission
• CPC Class Codes: H04M 3/567 Multimedia conference systems
• CPC Class Codes: H04M 3/568 audio processing specific to telephonic conferencing, e.g. spatial distribution, mixing of participants echo suppression in two-way loud-speaking telephone systems H04M9/02; sound field processing per se H04S7/30
• CPC Class Codes: H04M 7/006 Networks other than PSTN/ISDN providing telephone service, e.g. Voice over Internet Protocol (VoIP) , including next generation networks with a packet-switched transport layer H04L65/00 takes precedence; aspects not specific to the type of network H04M3/00; special services in those networks H04M3/42
• CPC Class Codes: H04M 9/08 Two-way loud-speaking telephone systems with means for conditioning the signal, e.g. for suppressing echoes for one or both directions of traffic
• CPC Class Codes: H04N 21/4143 embedded in a Personal Computer [PC]
• CPC Class Codes: H04N 21/643 Communication protocols network streaming protocols, e.g. real-time transport protocol [RTP] or real-time control protocol [RTCP], H04L65/65
• CPC Class Codes: H04N 7/148 Interfacing a video terminal to a particular transmission medium, e.g. ISDN
• CPC Class Codes: H04N 7/15 Conference systems
• CPC Class Codes: H04Q 2213/13003 Constructional details of switching devices
• CPC Class Codes: H04Q 2213/13103 Memory
• CPC Class Codes: H04Q 2213/13106 Microprocessor, CPU
• CPC Class Codes: H04Q 2213/13204 Protocols
• CPC Class Codes: H04Q 2213/13209 ISDN
• CPC Class Codes: H04Q 2213/1324 Conference call
• CPC Class Codes: H04Q 2213/13299 Bus
• CPC Class Codes: H04Q 2213/13337 Picturephone, videotelephony
• CPC Class Codes: H04Q 2213/13389 : LAN, internet

Abstract

Remote audio information corresponding to remote audio signals are received by a controller from a remote node. A level of transmit attenuation and a level of receive attenuation are generated by the controller using the remote audio information. The local audio signals are attenuated with a transmit attenuator at the level of transmit attenuation for transmission to a remote node. Remote audio signals received from the remote node are attenuated with a receive attenuator at the level of receive attenuation for playback at a local speaker.

Claims

1. An apparatus for processing audio signals, comprising:

(a) a transmit attenuator for attenuating local audio signals generated by a local microphone for transmission to a remote node;

(b) a receive attenuator for attenuating remote audio signals received from the remote node for playback at a local speaker; and

(c) a controller, electrically connected to the transmit attenuator and the receive attenuator, for controlling a level of transmit attenuation for the transmit attenuator and a level of receive attenuation for the receive attenuator, wherein;

the controller receives, from the remote node, remote audio information corresponding to the remote audio signals;

the remote audio information is distinct from the remote audio signals;

the remote audio information has been generated by the remote node based on the remote audio signals; and

the controller uses the remote audio information to generate the level of transmit attenuation and the level of receive attenuation without having to implement local processing of the remote audio signals to generate a locally-generated version of the remote audio information.

2. The apparatus of claim 1, wherein the remote audio information comprises remote energy levels corresponding to the remote audio signals.

3. The apparatus of claim 2, wherein the remote audio information further comprises a level of remote background noise.

4. The apparatus of claim 3, wherein the level of remote background noise is received by the controller from the remote node less frequently than the remote energy levels.

5. The apparatus of claim 1, wherein the remote audio information comprises a level of remote background noise.

6. The apparatus of claim 1, wherein the controller generates local audio information corresponding to the local audio signals for transmission to the remote node.

7. The apparatus of claim 6, wherein the local audio information comprises local energy levels corresponding to the local audio signals.

8. The apparatus of claim 6, wherein the local audio information comprises a level of local background noise.

9. The apparatus of claim 1, wherein:

the remote audio information comprises remote energy levels corresponding to the remote audio signals and a level of remote background noise;

the level of remote background noise is received by the controller from the remote node less frequently than the remote energy levels;

the controller generates local audio information corresponding to the local audio signals for transmission to the remote node;

the local audio information comprises local energy levels corresponding to the local audio signals and a level of local background noise; and

the controller uses the local and remote energy levels and the levels of remote and local background noise to generate the levels of transmit and receive attenuation.

10. A computer-implemented process for processing audio signals, comprising the steps of:

(a) receiving, by a controller from a remote node, remote audio information corresponding to remote audio signals, where;

the remote audio information is distinct from the remote audio signals; and

the remote audio information has been generated by the remote node based on the remote audio signals;

(b) generating, by the controller, a level of transmit attenuation and a level of receive attenuation using the remote audio information without having to implement local processing of the remote audio signals to generate a locally-generated version of the remote audio information;

(c) attenuating, with a transmit attenuator at the level of transmit attenuation, the local audio signals for transmission to a remote node; and

(d) attenuating, with a receive attenuator at the level of receive attenuation, remote audio signals received from the remote node for playback at a local speaker.

11. The process of claim 10, wherein step (a) comprises the step of receiving remote energy levels corresponding to the remote audio signals.

12. The process of claim 11, wherein step (a) further comprises the step of receiving a level of remote background noise.

13. The process of claim 12, wherein step (a) comprises the step of receiving the level of remote background noise less frequently than the remote energy levels.

14. The process of claim 10, wherein step (a) comprises the step of receiving a level of remote background noise.

15. The process of claim 10, wherein step (a) further comprises the step of generating local audio information corresponding to the local audio signals for transmission to the remote node.

16. The process of claim 15, wherein step (a) comprises the step of generating local energy levels corresponding to the local audio signals.

17. The process of claim 15, wherein step (a) comprises the step of generating a level of local background noise.

18. The process of claim 10, wherein:

step (a) comprises the steps of;

(1) receiving remote energy levels corresponding to the remote audio signals and a level of remote background noise, wherein the level of remote background noise is received by the controller from the remote node less frequently than the remote energy levels; and

(2) generating local energy levels corresponding to the local audio signals and a level of local background noise for transmission to the remote node; and

step (b) comprises the step of generating the levels of transmit and receive attenuation using the local and remote energy levels and the levels of remote and local background noise.