Telephone conferencing system and method

• US 7,505,423 B2
• Filed: 08/14/2002
• Issued: 03/17/2009
• Est. Priority Date: 02/25/2002
• Status: Active Grant

• 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:
  US10/218,761
• Publication Number:
  US 20030161314A1
• Time in Patent Office: 2,407 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

Processing separate audio input packets from each connection of a telephone conference assigns audio input packets from each connection to a sequence of output periods. Each connection is then sequenced a first time during each output period for processing any input packets assigned to that output period. Each connection is then sequenced a second time during each output period for preparing a separate audio output packet for each connection.

Claims

1. A method for processing separate 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 respective output periods for sending audio output packets to all connections;

first sequencing through each of the connections a first time during each respective output period for processing any audio input packets assigned to the respective output period; and

second sequencing through each of the connections a second time during each respective output period for preparing a separate audio output packet for each respective connection during each respective output period based upon said processing any audio input packets in said first sequencing.

2. The method of claim 1, further comprising the steps of:

determining the applicability to each respective output period of using a common audio output packet for a plurality of connections; and

preparing a respective common audio output packet for each said respective output period where a common audio output packet is applicable, based upon said processing any audio input packets in said first sequencing,

wherein said second sequencing through each of the connections a second time during each respective output period for preparing a separate output packet includes using said respective common audio output packet, where applicable.

3. The method of claim 2, wherein said step of first sequencing through each of the connections a first time during each respective output period includes normalizing audio input packets assigned to each respective output period to create normalized audio input packets and identifying a plurality of loudest connections for each respective output period based upon said normalized audio input packets;

and

further wherein said step of preparing a respective common audio output packet includes mixing said normalized input audio packets from said plurality of loudest connections for each respective output period.

4. The method of claim 1, wherein said steps of first sequencing and second sequencing are performed by a high priority, object oriented, process implemented as computer readable code embodied in a computer readable medium.

5. The method of claim 1, further comprising performing said step of assigning and other aspects of a teleconferencing function while the steps of first sequencing and second sequencing are not being performed.

6. The method of claim 1 adapted for handling a plurality of telephone conferences each having a multiplicity of respective participating connections producing individual sequences of audio input packets, further comprising separately initiating said steps of first sequencing and second sequencing for each of the plurality of telephone conferences during a predetermined one of a plurality of processing intervals within each output period for handling different individual conferences during each processing interval.

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

a first sequencing process for sequencing through each of the connections a first time during each respective output period for processing any audio input packets assigned to the respective output period; and

a determining process for determining the applicability to each respective output period of using a common audio output packet for a plurality of connections;

a preparing process for preparing a respective common audio output packet based upon said processing any audio input packets in said first sequencing, for each output period where a common audio output packet is applicable;

a second sequencing process for sequencing through each of the connections a second time during each respective output period for preparing a separate audio output packet for each respective connection, including using said respective common audio output packet, where applicable.

8. The system of claim 7, wherein said first sequencing process, second sequencing process, determining process and preparing process are implemented in high priority, object oriented, computer code stored in a computer readable medium.

9. The system of claim 7, wherein said first sequencing process includes a normalizing process for normalizing audio input packets assigned to each respective output period to create normalized audio input packets and an identifying process for identifying a plurality of loudest connections for each respective output period;

and

further wherein said preparing process for preparing a common audio output packet includes mixing said normalized input audio packets from said plurality of loudest connections for each respective output period.

10. The system of claim 9, wherein said second sequencing process includes:

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

a third preparing process for preparing an audio output packet, for connections not identified as loudest connections for the 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.

11. The system of claim 9, wherein said normalizing process includes:

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

a second determining process for determining a packet energy value for each said audio input packet based upon the multiplied sample values,

and further wherein said identifying process is responsive to determined packet energy values.

12. A method for handling a plurality of respective telephone conferences each having a multiplicity of respective participating connections producing individual sequences of audio input packets, comprising the steps of:

preparing a connection-specific audio output packet for each connection of the multiplicity of respective participating connections of each respective conference of the plurality of telephone conferences during each one of a sequence of respective output periods, wherein said connection-specific audio output packets are based upon audio input packets from one or more connections of the multiplicity of respective participating connections of each respective conference; and

separately initiating said preparing step for each respective conference during a predetermined one of a plurality of processing intervals within each output period for handling different individual conferences during each processing interval of the plurality of processing intervals.

13. The method of claim 12, wherein said steps of preparing and separately initiating are performed by a high priority, object oriented, process implemented as computer readable code embodied in a computer readable medium.

14. The method of claim 12, further comprising processing other aspects of a teleconferencing function for the plurality of telephone conferences while the preparing process is not functioning.

15. The method of claim 12, further comprising assigning audio input packets from each connection to said sequence of respective output periods for each respective conference;

wherein said preparing step includes first sequencing through each connection for each respective conference a first time during each respective output period for processing any audio input packets assigned to the respective output period, and second sequencing through each connection for each respective conference a second time during each respective output period to prepare a separate audio output packet for each connection during each respective output period based upon said processing any audio input packets in said first sequencing.

16. The method of claim 12, further comprising the steps of:

determining the applicability to each respective output period for each respective conference of using a common audio output packet for a plurality of respective participating connections; and

preparing a respective common audio output packet for each said output period and respective conference where a common audio output packet is applicable, based upon said processing any audio input packets in said first sequencing,

wherein said second sequencing through each of the connections a second time during each output period for preparing a separate output packet includes using said respective common audio output packet, where applicable.

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;

a computing process implemented in computer code embodied in a medium readable by the computer, said computing process being adapted to be responsive to the telephone control signals and the audio input packets and to provide conferencing services for a multiplicity of conferences each having a multiplicity of telephone connections; and

a media service process module within the computing process and adapted to receive all audio input packets and to create audio output packets for each telephone connection of the multiplicity of telephone connections for each conference of the multiplicity of conferences in response to the received audio input packets,

wherein the media service process module includes;

an assigning process for assigning audio input packets from each connection to a sequence of output periods for sending separate audio output packets to each telephone connection of the multiplicity of conferences;

a sequencing process for sequencing through each telephone connection a first time during each output period for processing any audio input packets assigned to each respective output period;

a preparing process for preparing a connection-specific audio output packet for each telephone connection of each respective conference during each one of said output periods, based upon said processing of audio input packets in said sequencing process, from one or more connections of each respective conference; and

a timing process for separately initiating said sequencing and preparing processes during a predetermined one of a plurality of processing intervals within each output period for handling different individual conferences during each processing interval.

18. The system of claim 17, wherein said sequencing process, said preparing process and said timing process are performed by a high priority, object oriented software thread within the computer code, and further wherein said computing process and said media service process are adapted to perform said assigning process and other teleconferencing functions while said high priority, object oriented software thread is not functioning.

19. The system of claim 18, wherein said high priority, object oriented software thread further includes

a determining process for determining the applicability to each said output period for each respective conference of using a common audio output packet for a plurality of connections for each respective conference, and

a second preparing process for preparing a respective common audio output packet for each conference and each said output period where a common audio output packet is applicable, based upon said processing any audio input packets in said sequencing process;

and further wherein the first said preparing process uses said respective common audio output packet, where applicable.