System and method for processing digital audio packets for telephone conferencing

• US 7,177,286 B2
• Filed: 08/14/2002
• Issued: 02/13/2007
• Est. Priority Date: 02/25/2002
• Status: Expired due to Fees

• Current Assignee: Sonexis Technology, Inc. (Compunetix, Inc.)
• Original Assignee: Sixenos, Inc. (Compunetix, Inc.)
• Inventors: Koschella, James J, Flowers, Jeffry C
• Primary Examiner(s): HO, DUC CHI
• Application Number:
  US10/218,819
• Publication Number:
  US 20030161345A1
• Time in Patent Office: 1,644 Days
• Field of Search: None
• US Class Current: 370/260
• CPC Class Codes: H04M 3/56 Arrangements for connecting several subscribers to a common circuit, i.e. affording conference facilities video conference systems H04N7/15
• 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

Abstract

Telephone conferencing with processing of sequential audio input packets from connections of the conference with assignment of input packets from each connection to a sequence of output sending periods, determination of applicability to each output period of using a common audio output packet for a plurality of connections, preparing and using a common audio output packet where applicable for multiple connections and further output packets for selected connections, combined where applicable for selected connections.

Claims

1. A telephone conferencing system which processes sequential audio input packets from each of one or more connections of a telephone conference having a multiplicity of connections participating therein, comprising:

an assigning process for assigning audio input packets from each connection to a sequence of output periods for sending separate audio output packets to all connections;

a normalizing process for creating normalized audio input packets from the audio input packets and for identifying a plurality of loudest connections from the normalized audio input packets assigned to each respective output period;

a determining process for determining the applicability to each respective output period of using a common audio output packet for a plurality of connections, based upon said normalized audio input packets assigned to said each respective output period;

a first preparing process for preparing a common audio output packet for each output period where a common audio output packet is applicable, from said normalized audio input packets of said plurality of loudest connections from each respective output period; and

a second preparing process for preparing a separate audio output packet specifically for each connection during each output period including use of said respective common audio output packet where applicable.

2. The system of claim 1, wherein said normalizing process includes a sequencing process for sequencing through each of the connections a first time during each output period to normalize only audio input packets assigned to the respective output period.

3. The system of claim 1, wherein said first preparing process for preparing a common audio output packet includes a mixing process for mixing any conference wide announcements with said normalized audio input packets from said plurality of loudest connections for each respective output period.

4. The system of claim 3, wherein said second preparing process for preparing a separate audio output packet for each connection during each output period includes a third preparing process for preparing an audio output packet for each said loudest connection of each output period, by mixing said normalized audio input packets from any other said loudest connections identified for each respective output period.

5. The system of claim 4, wherein said second preparing process for preparing an audio output packet for each connection during each output period further includes a fourth preparing process for preparing an audio output packet for connections not identified as loudest connections for each respective output period, using one or more selections from the group of:

said respective common audio output packet;

a conference wide announcement; and

a connection specific announcement.

6. The system of claim 1, wherein the normalizing process includes:

a multiplying process for multiplying sample values within each audio input packet by a gain factor;

a second determining process for determining a packet energy value for each said audio input packet based upon respective multiplied sample values; and

an identifying process for identifying a plurality of loudest connections having the highest said packet energy values for each respective output period.

7. A method for processing audio input packets from each of one or more connections of a telephone conference having a multiplicity of connections participating therein, comprising the steps of:

assigning audio input packets from each connection to a sequence of output periods for sending separate audio output packets to all connections;

normalizing audio input packets from the connections to create normalized audio input packets;

determining the applicability to each output period of using a common audio output packet for a plurality of connections, based upon said normalized audio input packets assigned to each respective output period;

preparing a common audio output packet from one or more of said normalized audio input packets assigned to each output period where a common audio output packet is applicable; and

preparing a separate audio output packet specifically for each connection during each output period including use of said respective common audio output packet where applicable.

8. The method of claim 7, wherein said step of assigning includes reading any transmission time data contained in each of the audio input packets and assigning sequential audio input packets from each connection to corresponding sequential output periods in response to read transmission time data, wherein the input packets assigned to each output period are from different connections.

9. The method of claim 8, wherein said step of normalizing includes sequencing through each of the connections a first time during each output period to normalize only audio input packets assigned to the respective output period.

10. The method of claim 8, wherein said step of normalizing audio input packets, includes the steps of:

multiplying sample values within each audio input packet by a gain factor;

determining a packet energy value for each audio input packet based upon respective multiplied sample values; and

identifying a plurality of loudest connections having the highest determined said packet energy values for each respective said output period.

11. The method of claim 10, wherein said step of creating a common audio output packet includes mixing said normalized input audio packets from said plurality of loudest connections for each respective output period.

12. The method of claim 11, wherein said step of creating a common audio output packet includes mixing any conference wide announcements with said normalized audio input packets from said plurality of loudest connections for each respective output period.

13. The method of claim 11, wherein said step of preparing a separate audio output packet for each connection during each output period includes preparing an audio output packet for each said loudest connection of each output period, by mixing said normalized audio input packets from any other said loudest connections identified for each respective output period.

14. The method of claim 13, wherein said step of preparing a separate audio output packet for each connection during each output period further includes preparing an audio output packet, for connections not identified as loudest connections for each respective output period, using one or more selections from the group of:

said respective common audio output packet;

a conference wide announcement; and

a connection specific announcement.

15. The method of claim 14, wherein the step of preparing a separate audio output packet for each connection during each output period includes sequencing through each of the connections a second time during each output period.

16. A computer readable medium containing instructions when excecuted by a computer causes the practice of the method according to claim 7.

17. A telephone conferencing system, comprising:

a computer being adapted to receive digitized telephony signals from a significant number of telephone connections including telephone control signals and audio input packets;

means for effecting a computing process responsive to the telephone control signals and the audio input packets and being adapted to provide conferencing services to a multiplicity of conferences each having a multiplicity of connections; and

means for effecting a media service process provided as a media service module within the means for effecting a computing process and adapted to receive all audio input packets and to create audio output packets in response to the received audio input packets,

the media service module is constructed and arranged to assign audio input packets from each connection in a sequence of output periods for sending separate audio output packets to all connections and to normalize audio input packets from the audio input packets and to identify a plurality of loudest connections from the normalized audio input packets assigned to each respective output period and to determine the applicability to each respective output period of using a common audio output packet for a plurality of connections, based upon said normalized audio input packets assigned to said each respective output period;

first means for preparing a common audio output packet for each output period where a common audio output packet is applicable, from said normalized audio input packets of said plurality of loudest connections from each respective output period; and

second means for preparing a separate audio output packet specifically for each connection during each output period including use of said respective common audio output packet where applicable.

18. The system of claim 17, wherein said media service module normalizing includes mean for sequencing through each of the connections a first time during each output period to normalize only audio input packets assigned to the respective output period.

19. The system of claim 17, wherein said second means for preparing a separate audio output packet for each connection during each output period includes:

third means for preparing an audio output packet for each said loudest connection of each output period, by mixing said normalized audio input packets from any other said loudest connections identified for each respective output period; and

fourth means for preparing an audio output packet for connections not identified as loudest connections for each respective output period, using one or more selections from the group of;

said respective common audio output packet;

a conference wide announcement; and

a connection specific announcement.