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Estimating the pitch of a speech signal using a binary signal

A technology of binary signals and voice signals, which is applied in voice analysis, instruments, etc., and can solve problems such as complex calculations and impractical use

Inactive Publication Date: 2005-08-24
TELEFON AB LM ERICSSON (PUBL)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, this known algorithm is quite complex and requires a lot of calculations, these drawbacks make it less usable in real-time environments, such as the small digital signal processors used when they are used in mobile phones and similar devices

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  • Estimating the pitch of a speech signal using a binary signal
  • Estimating the pitch of a speech signal using a binary signal
  • Estimating the pitch of a speech signal using a binary signal

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Embodiment Construction

[0042] figure 1 A block diagram showing an example of a tone detector 1 according to the present invention, in the sampling circuit 3 the speech signal 2 is sampled at a sampling rate of 8KHz, and the samples are divided into segments or frames of 160 consecutive samples. Thus, each segment corresponds to a 20 ms speech signal, which is the sampling and segmentation typically used for speech processing in standard mobile phones.

[0043] Each segment of 160 samples is then processed in filter 4 which will be described in more detail below.

[0044] First, however, the properties of the speech signal will be briefly mentioned. In a classical approach, the speech signal is modeled as the output of a slowly time-varying linear filter excited by either a quasi-periodic pulse train, Or excited by random noise, depending on whether voiced or unvoiced sounds are to be produced. The pulse train that produces the voiced sound is produced by squeezing the air out of the lungs through ...

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Abstract

A method of estimating the pitch of a speech signal (2) comprises the steps of sampling the speech signal to obtain a series of samples, dividing the series of samples into segments, each segment having a fixed number of consecutive samples, calculating for each segment a conformity function, and detecting peaks in the conformity function. The method further comprises the steps of providing an intermediate signal derived from the speech signal, converting the intermediate signal to a binary signal, which is set to logical ''1'' where the intermediate signal exceeds a pre-selected threshold and to logical ''0'' where the intermediate signal does not exceed the pre-selected threshold, calculating the autocorrelation of the binary signal, and using the distance between peaks in the autocorrelation of the binary signal as an estimate of the pitch. The large amount of operations needed in prior art algorithms is thus avoided. A similar device is also provided.

Description

technical field [0001] The invention relates to a method of estimating the pitch of a speech signal, said method being of the type in which the speech signal is divided into segments, a coincidence function of the signal is calculated for each segment, and peaks in the coincidence function are detected. The invention also relates to the use of the method in a mobile phone. The invention also relates to a device for estimating the pitch of a speech signal. Background technique [0002] In many speech processing systems it is desirable to know the pitch period of speech. As an example, many speech augmentation algorithms depend on correct estimation of the pitch period. One application area where speech processing algorithms are widely used is mobile telephony. [0003] A well-known method of estimating the pitch period is to use an autocorrelation function, or a similar coincidence function, on the speech signal. An example of such a method is described in the literature: ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G10L25/90
CPCG10L25/90
Inventor C·安德伦H·约翰尼松
Owner TELEFON AB LM ERICSSON (PUBL)