SYSTEM AND METHOD FOR ECHO SUPPRESSION IN WEB BROWSER-BASED COMMUNICATION

• US 20110235499A1
• Filed: 02/25/2011
• Published: 09/29/2011
• Est. Priority Date: 02/25/2010
• Status: Active Grant

• Current Assignee: Vonage Business Inc (Telefonaktiebolaget LM Ericsson)
• Original Assignee: Tokbox Incorporated (Telefonaktiebolaget LM Ericsson)
• Inventors: Gupta, Gaurav, Cao, Yang, Chang, Chuo-Ling, Rajasekar, Badri N., Girod, Bernd
• Granted Patent: US 8,553,520 B2
• Time in Patent Office: Days
• US Class Current: 370/201
• CPC Class Codes: H04M 9/082 using echo cancellers echo cancellers per se H04B3/23

Abstract

A system and method for performing echo suppression on a server in browser-based online audio conferences without downloading or installing software on a participant'"'"'s computing device is disclosed. Streams of audio communication data from the participants in an audio conference are received at the server. An echo suppression application determines the first party that speaks by analyzing the streams to locate speech data, and assigns that party as the “owner” of the audio channel. The speech data is sent to the other participants in the conference. The application then determines whether newly received audio from the owner of the channel is new speech; if so, then the party remains the owner of the channel, and the new speech data is also sent to the other parties in the conference. The channel is surrendered if no new speech is received from the owner in a defined period, and the next party that speaks becomes the new owner of the channel. The other audio data from the participants is replaced by silence.

Claims

1. A method of suppressing echoes in an online audio conference, comprising:

receiving at a server a plurality of audio streams from a plurality of users participating in the conference, each user operating a device that has a microphone and that sends to the server a stream of packets of audio data representing the sound received at the microphone;

testing the packets in the order received at the server to identify the first packet that contains audio data indicative of speech by a user;

designating the stream containing the identified first packet containing speech data as the active stream;

setting the streams other than the active stream to silence; and

distributing the streams to the devices of the identified users.

2. The method of claim 1 wherein the device operated by a user comprises a processor running a web browser and a communication application running within the web browser which generates the stream of packets of audio data from the sound received at the microphone of the device.

3. The method of claim 1 further comprising:

testing subsequent packets in the active stream to see if audio data in the subsequent packets represents speech received at the microphone of the user device within a predefined time of the speech represented in the first identified packet;

if the subsequent packets in the active stream represent speech received at the microphone within the predefined time, maintaining the stream as the active stream; and

if the subsequent packets in the active stream do not represent speech received at the microphone within the predefined time, testing the packets received at the server for the next packet that contains audio data indicative of speech by a user and designating the stream containing the next packet containing audio data as the new active stream.

4. The method of claim 3 wherein the predefined time is set to compensate for gaps between words in speech and for the time needed for packets to make a round trip between the device providing the new active stream and the server.

5. The method of claim 1 wherein testing the packets to identify the first packet that contains audio data indicative of speech by a user comprises calculating the level of the sound represented by the data in the packets and comparing it to a threshold.

6. The method of claim 5 wherein the threshold is adjusted based upon the level of ambient sound at the microphone.

7. The method of claim 1 wherein setting the streams other than the active stream to silence comprises replacing the audio data in the received packets in the other streams with data representing a sound level of zero.

8. The method of claim 1 wherein setting the streams other than the active stream to silence comprises replacing the audio data in the received packets in the other streams with data representing a low level of comfort noise.

9. A system for suppressing echoes in an online audio conference, comprising:

an input means for receiving a plurality of streams of packets of audio data, each stream corresponding to the sound generated by one of a plurality of participants in the conference;

a processor configured to;

test the packets in the order received to identify the first packet that contains audio data indicative of speech by a participant;

designate the stream containing the identified first packet containing speech data as the active stream;

replace the streams other than the active stream with streams of packets representing silence; and

an output means for distributing the streams to the participants.

10. The system of claim 9 wherein each of the streams of packets of audio data are generated by a communication application running within a web browser from the sound received at a microphone of a device running the web browser.

11. The system of claim 9 wherein the processor is further configured to:

test subsequent packets in the active stream to see if audio data in the subsequent packets represents speech received at the microphone of the user device within a predefined time of the speech'"'"'represented in the first identified packet;

if the subsequent packets in the active stream represent speech received at the microphone within the predefined time, maintain the stream as the active stream; and

if the subsequent packets in the active stream do not represent speech received at the microphone within the predefined time, test the packets received at the server for the next packet that contains audio data indicative of speech by a user and designate the stream containing the next packet containing audio data as the new active stream.

12. The system of claim 11 wherein the predefined time is set to compensate for gaps between words in speech and for the time needed for packets to make a round trip between the device providing the new active stream and the server.

13. The system of claim 9 wherein the processor is further configured to test the packets to identify the first packet that contains audio data indicative of speech by a user by calculating the level of the sound represented by the data in the packets and comparing it to a threshold.

14. The system of claim 13 wherein the threshold is adjusted based upon the level of ambient sound at the microphone.

15. The system of claim 9 wherein the processor is further configured to replace the streams other than the active stream with streams of packets representing silence by replacing the audio data in the received packets in the other streams with data representing a sound level of zero.

16. The system of claim 9 wherein the processor is further configured to replace the streams other than the active stream with streams of packets representing silence by replacing the audio data in the received packets in the other streams with data representing a low level of comfort noise.

17. A non-transitory computer-readable medium having embodied thereon a program, the program being executable by a processor to perform a method comprising the steps of:

receiving at a server a plurality of audio streams from a plurality of users participating in the conference, each user operating a device that has a microphone and that sends to the server a stream of packets of audio data representing the sound received at the microphone;

testing the packets in the order received at the server to identify the first packet that contains audio data indicative of speech by a user;

designating the stream containing the identified first packet containing speech data as the active stream;

setting the streams other than the active stream to silence; and

distributing the streams to the devices of the identified users.