System and method for avoiding clipping in a communications system

• US 20060153247A1
• Filed: 01/12/2006
• Published: 07/13/2006
• Est. Priority Date: 01/13/2005
• Status: Abandoned Application

• Current Assignee: Siemens Enterprise Communications, Inc. (Atos SE)
• Original Assignee: Siemens Information And Communication Networks, Inc.
• Inventors: Stumer, Peggy Marie
• Application Number:
  US11/330,483
• Publication Number:
  US 20060153247A1
• Time in Patent Office: Days
• US Class Current: 370/517
• CPC Class Codes: H04J 3/0632 Synchronisation of packets and cells, e.g. transmission of voice via a packet network, circuit emulation service [CES] queuing arrangements in packet switching elements H04L49/90; synchronising systems for the synchronous transmission of a pulse code modulated video signal with one or more other pulse code modulated signals H04N7/56
• CPC Class Codes: H04L 47/10 Flow control; Congestion control
• CPC Class Codes: H04L 47/18 End to end
• CPC Class Codes: H04L 47/2416 Real-time traffic
• CPC Class Codes: H04L 47/283 in response to processing delays, e.g. caused by jitter or round trip time [RTT]
• CPC Class Codes: H04L 47/32 by discarding or delaying data units, e.g. packets or frames
• CPC Class Codes: H04L 65/1101 Session protocols
• CPC Class Codes: H04L 65/1104 Session initiation protocol [SIP]
• CPC Class Codes: H04L 65/613 for the control of the source by the destination control signals issued by the client directed to the server or network components specially adapted for selective content distribution H04N21/637

Abstract

In a communication system, a buffer is provided at or between a transmitting device and a receiving device. When the transmitting device is unable to send a stream of media packets or the receiving device is unable to render the stream of media packets, the buffer stores the media packets, and the size of the buffer is reduced when the transmitting device is able to send the stream of media packets and/or the receiving device is able to render the stream of packets.

Claims

1. A method of eliminating or reducing clipping in a communication system comprising a transmitting device connected remotely to a receiving device where media data is sent in packets from said transmitting device to said receiving device comprising the steps of:

a) providing a buffer at said receiving device, or between said transmitting device and said receiving device;

b) detecting that the receiving device is unable to render a stream of media packets sent from said transmitting device;

c) storing media packets from said stream of media packets in said buffer; and

d) reducing the size of said buffer when said receiving device is able to render said stream until buffer is substantially empty.

2. The method of claim 1, wherein said buffer is part of said receiving device.

3. The method of claim 1, wherein at least one of said transmitting device and said receiving device is a mobile telephone and/or Session Initiation Protocol (SIP) workpoint.

4. The method of claim 1, wherein said stream of media packets comprises multimedia data.

5. The method of claim 1, wherein said reducing the size of said buffer further comprises the steps of:

d1) waiting until said stream of packets contains packets associated with silence or substantially little movement; and

d2) dropping said packets associated with silence or substantially little movement.

6. The method of claim 1, wherein said reducing the size of said buffer further comprises dropping a small number of packets at a time while said stream of packets contains packets associated with speech or motion.

7. The method of claim 6, wherein the rate at which said small number of packets is dropped is adjustable according to preferences.

8. A method of eliminating or reducing clipping in a communication system comprising a transmitting device connected remotely to a receiving device where media data is sent in packets from said transmitting device to said receiving device comprising the steps of:

a) providing a buffer at said transmitting device, or between said transmitting device and said receiving device;

b) detecting that the transmitting device is unable to send a stream of media packets to said receiving device;

c) storing media packets from said stream of media packets in said buffer; and

d) reducing the size of said buffer when said transmitting device is able to send a stream of packets to said receiving device until said buffer is substantially empty.

9. The method of claim 8, wherein said buffer is part of said transmitting device.

10. The method of claim 8, wherein at least one of said transmitting device and said receiving device is a mobile telephone.

11. The method of claim 8, wherein said stream of packets contains multimedia data.

12. A network comprising:

a) a receiving device logically connected to a transmitting device via signaling data; and

b) at least one buffer at said receiving device or between said transmitting device and said receiving device, wherein said at least one buffer contains a group of packets of media data from said transmitting device that cannot be immediately rendered at said receiving device, and wherein the size of said at least one buffer is reduced after said receiving device is able to render said group of packets of media data, until said at least one buffer is substantially empty.

13. The network of claim 12, wherein at least one of said at least one buffer is also a jitter buffer.

14. The network of claim 12, wherein said media data is multimedia data.

15. The network of claim 12, wherein at least one of said transmitting device and said receiving device is a mobile telephone and/or Session Initiation Protocol (SIP) workpoint.

16. The network of claim 12, wherein at least one of said at least one buffer is part of said receiving device.

17. A network comprising:

a) a transmitting device logically connected to a receiving device via signaling data; and

b) at least one buffer at said transmitting device or between said transmitting device and said receiving device, wherein said at least one buffer contains a group of packets of media data from said transmitting device that cannot be immediately streamed to said receiving device, and wherein the size of said at least one buffer is reduced after a media data stream from said transmitting device to said receiving device is established, until said at least one buffer is substantially empty.

18. The network of claim 17, wherein said media data is multimedia data.

19. The network of claim 17, wherein at least one of said transmitting device and said receiving device is a mobile telephone.

20. The network of claim 17, wherein at least one of said at least one buffer is part of said transmitting device.