Method for retransmitting a speech packet

• US 7,505,764 B2
• Filed: 10/28/2003
• Issued: 03/17/2009
• Est. Priority Date: 10/28/2003
• Status: Active Grant

• Current Assignee: Google Technology Holdings LLC (Alphabet Inc.)
• Original Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Inventors: Ashley, James Patrick, Proctor, Lee Michael
• Primary Examiner(s): Opsasnick; Michael N
• Application Number:
  US10/695,009
• Publication Number:
  US 20050089003A1
• Time in Patent Office: 1,967 Days
• Field of Search: 370/352, 455/423, 704/201, 704/221
• US Class Current: 455/423
• CPC Class Codes: H04L 1/0014 by adapting the source coding
• CPC Class Codes: H04L 1/1877 for semi-reliable protocols, e.g. for less sensitive applications like streaming video buffer level management for video bitstream control arrangements H04N21/44004
• CPC Class Codes: H04W 84/00 Network topologies

Abstract

The invention provides a method of retransmitting a speech packet. In one embodiment, the method includes receiving (S702) at a transmitting device (140) a first negative acknowledgement (NACK) from a receiving device (120). The NAK indicates a corrupted first speech packet transmission. The transmitting device then retrieves (S706) a first speech packet associated with the first NACK and compresses (S714-S720) the speech packet to form a replacement speech packet. Next, a current segment of speech is encoded (S808) to form a current speech packet and current speech packet is combined with the replacements speech packet. The combined speech packet is then transmitted (S814) to the receiving device.

Claims

1. A method for retransmitting a speech packet, the method comprising:

receiving at a speech transmitting device a first negative acknowledgement from a receiving communication device indicative of a corrupted first speech packet transmission;

retrieving a first speech packet associated with the first negative acknowledgement;

compressing the first speech packet to form a replacement speech packet;

encoding a current segment of speech responsive to the first negative acknowledgement to form a current speech packet;

combining the current speech packet with the replacement speech packet to form a combined speech packet; and

transmitting the combined speech packet.

2. The method of claim 1, wherein the current segment of speech is encoded at a second rate.

3. The method of claim 1, wherein the first speech packet is encoded at a first rate and the replacement speech packet is compressed at a second rate that is different from the first rate.

4. The method of claim 1, wherein receiving a first negative acknowledgement from the receiving communication device indicative of a corrupted first speech packet transmission further comprises:

determining the first speech packet is corrupted at a receiver buffer of the receiving communication device; and

transmitting the first negative acknowledgement to an initiating communication device.

5. The method of claim 1, wherein encoding a current segment of speech responsive to the first negative acknowledgement to form a current speech packet further comprises:

triggering a control signal to initiate a recompression/rate reduction algorithm responsive to the first negative acknowledgement;

sending the control signal to a speech encoder; and

encoding the current speech packet by applying a rate reduction algorithm.

6. The method of claim 1 wherein transmitting the combined speech packet further comprises:

embedding traffic type information to indicate the presence of the replacement speech packet and the current speech packet.

7. The method of claim 6, wherein the traffic type information comprises of primary traffic indication and secondary traffic indication.

8. The method of claim 1, wherein retrieving the first speech packet associated with the first negative acknowledgement further comprises:

determining a sequence number m of the corrupted speech packet referenced by the first negative acknowledgement;

retrieving the first speech packet from a buffer in an initiating communication device; and

determining if a data rate of the retrieved first speech packet is a first rate.

9. The method of claim 8 wherein determining the sequence number m further comprises:

determining a receive time of the first negative acknowledgement.

10. The method of claim 8, further comprising:

determining whether a preceding speech packet has been received at the receiving communication device.

11. The method of claim 10, wherein determining whether a preceding speech packet has been received at the receiving communication device further comprises:

determining if a second negative acknowledgement was received for the preceding speech packet having a sequence number m−

1; and

recovering speech parameters for the preceding packet if the second negative acknowledgement was not received for the preceding speech packet.

12. The method of claim 11, wherein compressing the first speech packet to form a replacement speech packet, further comprises:

stripping speech parameters from the retrieved first speech packet;

generating replacement speech parameters from the stripped speech parameters from the retrieved first speech packet and the recovered speech parameters from the preceding speech packet; and

applying the generated replacement speech parameters to the stripped retrieved first speech packet to form the replacement speech packet.

13. The method of 12, wherein the stripped parameters include line spectral pairs.