Clock drift compensation method and apparatus

A time stamp and signal technology, applied in interconnection devices, voice analysis, telephone communication, etc., can solve the problems of sampling rate far-end signal and near-end signal drift, echo cancellation effect, and inability to converge estimation, etc.

Inactive Publication Date: 2014-03-26
GOOGLE LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The mismatch of sampling rate will cause drift between the far-end signal and the near-end signal reaching the AEC
Linear graded filters have to accommodate this drift delay and may not converge to good estimates
This can greatly affect the echo cancellation effect

Method used

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  • Clock drift compensation method and apparatus
  • Clock drift compensation method and apparatus
  • Clock drift compensation method and apparatus

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Embodiment Construction

[0062] The following detailed description of embodiments of the invention will refer to these drawings. The following detailed description is not intended to limit the scope of the invention, which is determined by the appended claims and their equivalents.

[0063] figure 1 The working principle of the acoustic echo canceller (AEC) 100 is illustrated according to an exemplary embodiment of the present invention.

[0064] The AEC100 is a high quality echo canceller designed for voice and audio communications over packet switched networks. Specifically, the AEC 100 is designed to cancel acoustic echoes 130 that are generated by sound waves emitted by the emitting device 10 reflecting back to the proximal capture device 20 from interfaces and other objects. Another reason for the echo 130 is that the path from the emitting device 10 to the capturing device 20 is a direct path.

[0065] Emitting device 10 may be any audio output device, including a speaker or a set of speakers...

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PUM

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Abstract

A method and system to compensate for a drift between a first signal (110) and a second signal (120) is disclosed. The system includes a drift estimator (600) and a resampler (602). The drift estimator (600) receives, as input, for a predetermined amount of time, a first data set containing information related to a sample rate of the first signal (110) and a second data set containing information related to a sample rate of the second signal (120), and produces a one-time estimate of a drift between the first signal (110) and the second signal (120) based on the first data set and the second data set during the predetermined amount of time. The resampler (602) resamples the first signal (110) according to the estimated drift to compensate for the drift between the first signal (110) and the second signal (120).

Description

technical field [0001] Aspects of the invention relate generally to a method and system that compensates for drift between sampling rates applied to far-end and near-end signals. The inventive technique can be used for acoustic echo cancellation in telecommunication systems. The invention also relates to a method and system aimed at compensating for drift between far-end and near-end signals arriving at an acoustic echo canceller. Background technique [0002] Voice quality is an important concern for phone system providers. As customer demands for voice quality continue to increase, it is critical that phone system providers continue to improve. Echo is a delayed manifestation of the original transmission, and if the delay is long, it can seriously disrupt the speaker. If the short-range round-trip delay is less than 20 milliseconds, the talker cannot distinguish echoes and sidetones in the handset of the telephone. However, for long-range communications, such as satell...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04M9/08
CPCG10L19/005G10L21/01G10L21/02H04M9/082
Inventor A·J·麦克唐纳德J·斯科格伦德
Owner GOOGLE LLC
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