US6785261B1
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and system for forward error correction with different frame sizes
Assignee: HP Inc
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Filing: 1999-05-28
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Granted: 2004-08-31
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Expires: 2019-05-28
Abstract
Abstract A mechanism for recovering data associated with lost packets, suitable for use in a VoIP network. The telecommunications network is preferably a packet switched network having IP telephony gateways serving as interfaces between a telephone device and the IP network. The IP telephony gateway receives a conversation signal from the telephone device, and implements an improved forward error correction method. The method includes generating payload information defined by at least two packet sequences from the same audio information, and transmitting those two packet sequences on the IP network for receipt by a remote network device. The packet sequences are transmitted using RTP with two independent data streams or, alternatively, using a single data stream. The first and second data streams are data packet streams each defining a sequence of data packets. The first data stream is preferably formed using a G.711 vocoder, and the second data stream is preferably formed using a G.723.1 vocoder. The receiver inserts the G.711 packets into a receive buffer, and, in the event that G.711 data is missing or corrupted, the receiver will decode the relevant G.723.1 packets and place it in the buffer in the appropriate location. The buffered data is then used to reproduce the audio information at the receiver.
Inventors
- 👤 Guido M. Schuster
- 👤 Ikhlaq S. Sidhu
- 👤 Michael S. Borella
- 👤 Thomas J. Kostas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 10:04
CPC Classifications
H; H04; H04M; H04M7/00; H04M7/006; H04M7/0072; H04L; H04L65/00; H04L65/1066; H04L65/1101; H04L65/60; H04L65/70; H04L65/75; H04L65/764; H04L65/80; H04M7/0066; H04M7/0069; G; G10; G10L; G10L19/00; G10L19/005
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
149 words
In a telecommunications network including a first device and a second device used to transmit multimedia information, an improved method of communicating the multimedia information comprising, in combination: generating a first data stream containing a first version of vocoded audio information derived from original audio information, wherein the first data stream is representative of the entire original audio information; generating a redundant data stream containing a second version of vocoded audio information derived from the same said original audio information, wherein the redundant data stream is representative of the entire original audio information; transmitting said first and redundant data streams in the form of data packets from said first device to said second device; reproducing said original audio information from said first data stream; and reproducing said original audio information from the redundant data stream in the event that missing or corrupted data occurs in said first data stream.
Claim 2
Dependent Claim
149 words
In a telecommunications network including a first device and a second device used to transmit multimedia information, an improved method of communicating the multimedia information comprising, in combination: generating a first data stream containing a first version of vocoded audio information derived from original audio information, wherein the first data stream is representative of the entire original audio information; generating a redundant data stream containing a second version of vocoded audio information derived from the same said original audio information, wherein the redundant data stream is representative of the entire original audio information; transmitting said first and redundant data streams in the form of data packets from said first device to said second device; reproducing said original audio information from said first data stream; and reproducing said original audio information from the redundant data stream in the event that missing or corrupted data occurs in said first data stream.
Claim 3
Dependent Claim
34 words
The method as claimed in claim 1 , wherein: said telecommunications network comprises a packet switched network; said first and redundant data streams comprise data packet streams each defining a sequence of data packets.
Claim 4
Dependent Claim
19 words
The method as claimed in claim 1 , wherein said first data stream is formed using a G.711 vocoder.
Claim 5
Dependent Claim
19 words
The method as claimed in claim 1 , wherein said redundant data stream is formed using a G.723.1 vocoder.
Claim 6
Dependent Claim
25 words
The method as claimed in claim 1 , wherein transmitting said first and redundant data streams includes forming two Real Time Protocol (RTP) packet streams.
Claim 7
Dependent Claim
53 words
The method as claimed in claim 1 , wherein the first data stream is formed using a G.711 vocoder, the redundant data stream is formed using a G.723.1 vocoder, and the step of reproducing said original audio information from said first data stream includes forming an audio signal from the G.711 data stream.
Claim 8
Dependent Claim
23 words
The method as claimed in claim 6 , further comprising the step of inserting data from the G.711 packets into a receive buffer.
Claim 9
Dependent Claim
26 words
The method as claimed in claim 1 wherein the step of reproducing said original audio information from the redundant data stream includes decoding the G.723.1 packets.
Claim 10
Dependent Claim
119 words
The method as claimed in claim 1 , wherein the step of reproducing said original audio information from the redundant data stream in the event that missing or corrupted data occurs in said first data stream includes: monitoring sequence numbers and timestamp values of packets in said first data stream; detecting a gap in the sequence number of packets in said first data stream; determining a missing timestamp value corresponding to the gap in the sequence numbers; decoding a packet corresponding to the missing timestamp value from the redundant data stream; and inserting data from the packet decoded from the redundant data stream into a portion of the original audio information corresponding to the gap in the timestamp values.
Claim 11
Dependent Claim
152 words
In an Internet Protocol (IP) telephony gateway serving as an interface between a telephone device and an IP network, the IP telephony gateway receiving original audio information from the telephone device, an improved forward error correction method comprising, in combination: generating payload information defined by a first packet sequence and a redundant packet sequence containing the same original audio information, wherein the first packet sequence is obtained by vocoding the original audio information using a first vocoding standard and the redundant packet sequence is obtained by vocoding the original audio information using a second vocoding standard; transmitting the first packet sequence and the redundant packet sequence on the IP network, for receipt by a remote network device; reproducing the original audio information from the first packet sequence; and, reproducing the original audio information from the redundant packet sequence in the event that missing or corrupted data occurs in the first packet sequence.
Claim 12
Dependent Claim
152 words
In an Internet Protocol (IP) telephony gateway serving as an interface between a telephone device and an IP network, the IP telephony gateway receiving original audio information from the telephone device, an improved forward error correction method comprising, in combination: generating payload information defined by a first packet sequence and a redundant packet sequence containing the same original audio information, wherein the first packet sequence is obtained by vocoding the original audio information using a first vocoding standard and the redundant packet sequence is obtained by vocoding the original audio information using a second vocoding standard; transmitting the first packet sequence and the redundant packet sequence on the IP network, for receipt by a remote network device; reproducing the original audio information from the first packet sequence; and, reproducing the original audio information from the redundant packet sequence in the event that missing or corrupted data occurs in the first packet sequence.
Claim 13
Dependent Claim
16 words
The method of claim 10 wherein the packet sequences are transmitted using two independent data streams.
Claim 14
Dependent Claim
16 words
The method of claim 10 wherein the packet sequences are transmitted using a single data stream.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2007-08-31 | 2008-03-01 | 2008-08-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2011-08-31 | 2012-03-01 | 2012-08-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2015-08-31 | 2016-03-01 | 2016-08-31 | $7700.00 | Window Closed / Lapsed |