Invention Grant
US07668968B1 Closed-loop voice-over-internet-protocol (VOIP) with sender-controlled bandwidth adjustments prior to onset of packet losses
有权
在分组丢失发生之前，具有发送器控制的带宽调整的闭环语音互联网协议（VOIP）
- Patent Title: Closed-loop voice-over-internet-protocol (VOIP) with sender-controlled bandwidth adjustments prior to onset of packet losses
- Patent Title (中): 在分组丢失发生之前，具有发送器控制的带宽调整的闭环语音互联网协议（VOIP）
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Application No.: US10248002Application Date: 2002-12-09
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Publication No.: US07668968B1Publication Date: 2010-02-23
- Inventor: Shawn W. Smith
- Applicant: Shawn W. Smith
- Applicant Address: US CA San Francisco
- Assignee: Global IP Solutions, Inc.
- Current Assignee: Global IP Solutions, Inc.
- Current Assignee Address: US CA San Francisco
- Agent Mark Rodgers
- Main IPC: G06F15/16
- IPC: G06F15/16
Abstract:
A closed-loop voice-over-Internet-Protocol (VoIP) system has a local and a remote VOIP application. Each VOIP application monitors incoming packet arrival times and durations of audio data in the incoming packets to estimate bandwidth. The bandwidth estimates are forwarded to the other VOIP application. The forwarded bandwidth estimates are compared to a sending bandwidth. When the bandwidth estimate is above the sending bandwidth, compression and audio-frame decimation are reduced to improve voice quality. When the bandwidth estimate falls below the sending bandwidth, audio compression and decimation are increased to improve efficiency. Packet size can also be increased. Congestion estimates can also be sent with the audio data, causing packet transmission to pause until congestion ends. Incoming packet latencies are compared to a moving average to determine the congestion estimate, while bandwidth estimates are made by comparing packet audio duration to time between packet arrivals.
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