Method and system for managing time-sensitive packetized data streams at a receiver

• US 8,102,766 B2
• Filed: 11/02/2006
• Issued: 01/24/2012
• Est. Priority Date: 05/03/2001
• Status: Active Grant

• Current Assignee: Cisco Technology, Inc. (Cisco Systems, Inc.)
• Original Assignee: Cisco Technology, Inc. (Cisco Systems, Inc.)
• Inventors: Hahn, Paul S., Knappe, Michael E., Dunlap, Richard A., Surazski, Luke K.
• Primary Examiner(s): HSU, ALPUS
• Application Number:
  US11/555,752
• Publication Number:
  US 20070058652A1
• Time in Patent Office: 1,909 Days
• Field of Search: 370/231, 370/235, 370/252, 370/389, 704/214, 704/215, 704/226
• US Class Current: 370/231
• 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: H04Q 2213/13034 A/D conversion, code compression/expansion
• CPC Class Codes: H04Q 2213/13389 LAN, internet

Abstract

According to one embodiment of the invention, a method for managing time-sensitive packetized data streams at a receiver includes receiving a time-sensitive packet of a data stream, analyzing an energy level of a payload signal of the packet, and determining whether to drop the packet based on the energy level of the payload signal.

Claims

1. A method for managing time-sensitive packetized data streams at a receiver, comprising:

receiving a time-sensitive current packet of a data stream;

determining whether the current packet represents a voice signal;

upon determining that the current packet represents a voice signal, comparing an energy of a frequency band of a payload signal of the current packet to an energy of a frequency band of a payload signal of a previous packet to determine if the current packet and the previous packet represent voice signals that are similar such that dropping the current packet would result in minimal impact on intelligibility to the user; and

dropping the current packet upon determining that the current packet and the previous packet represent voice signals that are similar such that dropping the current packet would result in minimal impact on intelligibility to the user.

2. The method of claim 1, wherein the time-sensitive current packet comprises a real-time packet.

3. The method of claim 1, wherein the payload signal is a voice signal.

4. The method of claim 1, wherein determining whether the current packet represents a voice signal comprises:

determining a short term average energy of the payload signal of the current packet;

determining a noise floor estimate; and

comparing the short term average energy and the noise floor estimate.

5. The method of claim 1, further comprising storing the payload signal of the current packet.

6. A system for managing time-sensitive packetized data streams at a receiver, comprising:

an interface operable to receive a time-sensitive current packet of a data stream; and

a processor coupled to the interface and operable to;

determine whether the current packet represents a voice signal;

upon determining that the current packet represents a voice signal, compare an energy of a frequency band of a payload signal of the current packet to an energy of a frequency band of a payload signal of a previous packet to determine if the current packet and the previous packet represent voice signals that are similar such that dropping the current packet would result in minimal impact on intelligibility to the user; and

drop the current packet upon determining that the current packet and the previous packet represent voice signals that are similar such that dropping the current packet would result in minimal impact on intelligibility to the user.

7. The system of claim 6, wherein the time-sensitive current packet comprises a real-time packet.

8. The system of claim 6, wherein the payload signal is a voice signal.

9. The system of claim 6, wherein a processor operable to determine whether the current packet represents a voice signal is operable to:

determine a short term average energy of the payload signal of the current packet;

determine a noise floor estimate; and

compare the short term average energy and the noise floor estimate.

10. The system of claim 6, wherein the processor is further operable to store the payload signal of the current packet.

11. A set of logic encoded in non-transitory computer-readable media for managing time-sensitive packetized data streams at a receiver, the logic, when executed by a processor, operable to:

receive a time-sensitive current packet of a data stream;

determine whether the current packet represents a voice signal;

upon determining that the current packet represents a voice signal, compare an energy of a frequency band of a payload signal of the current packet to an energy of a frequency band of a payload signal of a previous packet to determine if the current packet and the previous packet represent voice signals that are similar such that dropping the current packet would result in minimal impact on intelligibility to the user; and

drop the current packet upon determining that the current packet and the previous packet represent voice signals that are similar such that dropping the current packet would result in minimal impact on intelligibility to the user.

12. The logic of claim 11, wherein the time-sensitive current packet comprises a real-time packet.

13. The logic of claim 11, wherein the payload signal is a voice signal.

14. The logic of claim 11, wherein logic operable to determine whether the current packet represents a voice signal comprises logic operable to:

determine a short term average energy of the payload signal of the current packet;

determine a noise floor estimate; and

compare the short term average energy and the noise floor estimate.

15. The logic of claim 11, further operable to store the payload signal of the current packet.

16. A system for managing time-sensitive packetized data streams at a receiver, comprising:

means for receiving a current packet of a data stream;

means for determining whether the current packet represents a voice signal;

means for comparing, upon determining that the current packet represents a voice signal, an energy of a frequency band of a payload signal of the current packet to an energy of a frequency band of a payload signal of a previous packet to determine if the current packet and the previous packet represent voice signals that are similar such that dropping the current packet would result in minimal impact on intelligibility to the user; and

means for dropping the current packet upon determining that the current packet and the previous packet represent voice signals that are similar such that dropping the current packet would result in minimal impact on intelligibility to the user.

17. The system of claim 16, further comprising means for storing the payload signal of the current packet.