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Double talk detector

A detector, double-ended technique, applied in the echo path estimation device, in the field of echo path estimation in telecommunication systems

Active Publication Date: 2012-09-05
TELEFON AB LM ERICSSON (PUBL)
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Problems solved by technology

[0017] Therefore, to achieve improved and accurate double-ended speech detection applicable to coded speech signals, there is still a problem

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Embodiment Construction

[0057] In the following description, specific details are set forth, such as a specific architecture and sequence of steps, in order to provide a thorough understanding of the present invention. However, it will be apparent to those skilled in the art that the present invention may be practiced in other embodiments that may differ from these specific details.

[0058] Furthermore, it can be seen that the described functions can be implemented using software operating in conjunction with a programmed microprocessor or general purpose computer and / or using application specific integrated circuits. Where the invention is described in the form of a method, the invention can also be embodied in a computer program product and in a system comprising a computer processor and memory, where the memory is used in one or more devices capable of performing the described functions. program to encode.

[0059] refer to figure 1 , the concept of the present invention is to detect that a rec...

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Abstract

A double talk, detector (14) for controlling the echo path estimation in a telecommunication system by indicating when a received coded speech signal (6) is dominated by a non-echo signal (5), i.e. that so-called double talk exists. This is determined by extracting the LSPs from a coded speech frame of the received coded speech signal when the signal power exceeds a first threshold value, converting each of said extracted LSPs into LSPs (Line Spectral Frequencies), Qi, and calculating the distance between each two adjacent LSFs. For each distance that is smaller than a second threshold, a spectral peak is located between the two LSF, and it is determined whether said spectral peak is an echo or not. When a predetermined number of non-echo spectral peaks are located in the received speech signal (6), double talk will be indicated, and the echo path estimation may be disabled.

Description

technical field [0001] The invention relates to a method of detecting that a received coded speech signal is dominated by non-echoic signals and a method of estimating echo paths in a telecommunication system. Furthermore, the present invention relates to a double talk detector and an echo path estimation device comprising the double talk detector. Background technique [0002] Speech transmission, such as by mobile phones and IP phones, usually involves speech coding, which is the compression of speech into a code for transmission using a speech codec. CELP (Code Excited Linear Prediction) coding is a commonly used speech coding method, which includes two stages (stage), namely, a linear prediction stage that models the spectral envelope (spectral envelope) and a linear prediction stage that models the remainder of the linear prediction stage. The code-book phase of modeling. [0003] In addition to the actual speech coding of the signal, channel coding can also be used f...

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Application Information

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IPC IPC(8): G10L21/02H04M9/08G10L21/0208
CPCH04M9/082G10L2021/02082G10L25/48G10L21/0208
Inventor T·特朗普
Owner TELEFON AB LM ERICSSON (PUBL)
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