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Denoising method and denoising devices for dual tone multi frequency signal

A dual-tone multi-frequency, frequency signal technology, applied in the field of signal processing, can solve problems affecting the recognition efficiency and recognition accuracy of dual-tone multi-frequency signals, and achieve the effect of improving recognition efficiency and recognition accuracy

Active Publication Date: 2015-12-16
XIAOMI INC
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Problems solved by technology

[0003] In related technologies, since environmental noise is unavoidable, the received DTMF signal often contains noise, which will affect the recognition efficiency and recognition accuracy of DTMF signal

Method used

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  • Denoising method and denoising devices for dual tone multi frequency signal
  • Denoising method and denoising devices for dual tone multi frequency signal
  • Denoising method and denoising devices for dual tone multi frequency signal

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Embodiment Construction

[0051] Exemplary embodiments will be described in detail herein, examples of which are illustrated in the accompanying drawings. Where the following description refers to the drawings, the same numerals in different drawings refer to the same or similar elements unless otherwise indicated. The implementations described in the illustrative examples below are not intended to represent all implementations consistent with this disclosure. Rather, they are merely examples of apparatus and methods consistent with some aspects of the present disclosure as recited in the appended claims.

[0052] figure 1 It is a flow chart of a method for denoising a dual-tone multi-frequency signal according to an exemplary embodiment.

[0053] Please refer to figure 1 , the denoising method of the dual-tone multi-frequency signal can be applied to a terminal, and the terminal can include smart devices such as a smart phone, a tablet computer, and a PDA (Personal Digital Assistant, handheld compu...

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Abstract

The invention relates to a denoising method and denoising devices for a dual tone multi frequency signal. The method comprises steps of performing discrete wavelet transform on an original dual tone multi frequency signal so as to obtain a transformation signal; filtering the transformation signal according to a preset filtration condition; and performing inverse discrete wavelet transform on the filtered transformation signal so as to obtain a denoised dual tone multi frequency signal. The disclosed terminal can firstly perform discrete wavelet transform on the original dual tone multi frequency signal so as to obtain the transformation signal, then, the transformation signal is filtered according to the preset filtration condition, and inverse discrete wavelet transform is performed on the filtered transformation signal, so that the noise contained in the original dual tone multi frequency signal is eliminated, and the recognition efficiency and recognition accuracy of the dual tone multi frequency signal are improved.

Description

technical field [0001] The present application relates to the technical field of signal processing, and in particular, to a method and device for denoising a dual-tone multi-frequency signal. Background technique [0002] DualToneMultiFrequency (DTMF), as a technology for fast and reliable transmission of telephone numbers, has been widely used in telephone communication systems. DualToneMultiFrequency is a combined signal composed of a high-frequency signal and a low-frequency signal. Usually used to send the called number. [0003] In the related art, since environmental noise is unavoidable, the received DTMF signal often contains noise, which will affect the recognition efficiency and recognition accuracy of the DTMF signal. SUMMARY OF THE INVENTION [0004] In order to overcome the problems existing in the related art, the present disclosure provides a method and device for denoising a dual-tone multi-frequency signal. [0005] According to a first aspect of the emb...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04M7/12
Inventor 孙荣艳章谨麟张宇鹏
Owner XIAOMI INC
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