CN105162998B - The denoising method and device of touch-tone signal - Google Patents
The denoising method and device of touch-tone signal Download PDFInfo
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- CN105162998B CN105162998B CN201510524155.XA CN201510524155A CN105162998B CN 105162998 B CN105162998 B CN 105162998B CN 201510524155 A CN201510524155 A CN 201510524155A CN 105162998 B CN105162998 B CN 105162998B
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Abstract
The disclosure is directed to the denoising methods and device of a kind of touch-tone signal.The method includes：Wavelet transform is carried out to original touch-tone signal, to obtain transformation signal；The transformation signal is filtered according to preset filter condition；Discrete wavelet inverse transformation is carried out to the transformation signal after filtering, to obtain the touch-tone signal after denoising.Disclosure terminal first can carry out wavelet transform to original touch-tone signal, to obtain transformation signal, then the transformation signal is filtered according to preset filter condition, discrete wavelet inverse transformation is carried out to the transformation signal after filtering again, to remove the noise to being included in original touch-tone signal, so as to improve the recognition efficiency of touch-tone signal and recognition accuracy.
Description
Technical field
This application involves signal processing technology field more particularly to the denoising methods and device of a kind of touch-tone signal.
Background technology
Dual-tone multifrequency (Dual Tone Multi Frequency, DTMF) is as the realization fast and reliable transmission of telephone number
A kind of technology, be widely used in telephonic communication system, touch-tone signal is by high-frequency signal and low frequency signal
The combination signal of composition is superimposed, commonly used in sending called number.
In the relevant technologies, since ambient noise is unavoidable, so often being wrapped in the touch-tone signal received
Contain noise, this will influence the recognition efficiency and recognition accuracy of touch-tone signal.
Invention content
To overcome the problems in correlation technique, the disclosure provides a kind of denoising method and dress of touch-tone signal
It puts.
According to the embodiment of the present disclosure in a first aspect, provide a kind of denoising method of touch-tone signal, including：
Wavelet transform is carried out to original touch-tone signal, to obtain transformation signal；
The transformation signal is filtered according to preset filter condition；
Discrete wavelet inverse transformation is carried out to the transformation signal after filtering, to obtain the touch-tone signal after denoising.
Optionally, it is described that the transformation signal is filtered according to preset filter condition, including：
Judge whether the coefficient of frequency that the transformation signal includes is higher than high frequency coefficient or less than low frequency coefficient；
If the coefficient of frequency that the transformation signal includes filters the change higher than high frequency coefficient or less than low frequency coefficient
Change the corresponding frequency signal of coefficient of frequency described in signal.
Optionally, it is described that wavelet transformation is carried out to original touch-tone signal, including：
One-dimensinal discrete small wave transformation is carried out under wavelet basis db3 to the original touch-tone signal.
Optionally, the transformation signal after described pair of filtering carries out discrete wavelet inverse transformation, including：
One-dimensional discrete inverse wavelet transform is carried out under wavelet basis db3 to the transformation signal after filtering.
Optionally, it further includes：
Identify the touch-tone signal after denoising.
According to the second aspect of the embodiment of the present disclosure, a kind of denoising device of touch-tone signal is provided, including：
Conversion module is configured as carrying out wavelet transform to original touch-tone signal, to obtain transformation signal；
Filtering module is configured as being filtered the transformation signal according to preset filter condition；
Inverse transform block is configured as carrying out discrete wavelet inverse transformation to the transformation signal after filtering, after obtaining denoising
Touch-tone signal.
Optionally, the filtering module includes：
Judging submodule is configured as judging whether the coefficient of frequency that the transformation signal includes is higher than high frequency coefficient or low
In low frequency coefficient；
Filter submodule is configured as being higher than high frequency coefficient or less than low frequency in the coefficient of frequency that the transformation signal includes
During coefficient, the corresponding frequency signal of coefficient of frequency described in the transformation signal is filtered.
Optionally, the conversion module includes：
Transformation submodule is configured as carrying out the original touch-tone signal under wavelet basis db3 one-dimensional discrete small
Wave conversion.
Optionally, the inverse transform block includes：
Inverse transformation submodule is configured as carrying out one-dimensional discrete small echo under wavelet basis db3 to the transformation signal after filtering
Inverse transformation.
Optionally, it further includes：
Identification module, the touch-tone signal being configured as after identification denoising.
According to the third aspect of the embodiment of the present disclosure, a kind of denoising device of touch-tone signal is provided, including：
Processor；
For storing the memory of processor-executable instruction；
Wherein, the processor is configured as：
Wavelet transform is carried out to original touch-tone signal, to obtain transformation signal；
The transformation signal is filtered according to preset filter condition；
Discrete wavelet inverse transformation is carried out to the transformation signal after filtering, to obtain the touch-tone signal after denoising.
The technical scheme provided by this disclosed embodiment can include the following benefits：
Disclosure terminal first can carry out wavelet transform to original touch-tone signal, to obtain transformation signal, so
The transformation signal is filtered according to preset filter condition afterwards, then anti-to the transformation signal progress discrete wavelet after filtering
Transformation, to remove the noise to being included in original touch-tone signal, so as to improve the recognition efficiency of touch-tone signal and knowledge
Other accuracy rate.
Disclosure terminal can be converted by filtering is higher than high frequency coefficient or the coefficient of frequency less than low frequency coefficient in signal
Corresponding frequency signal, with filter high frequency noise and low-frequency noise, so as to fulfill comprehensive filtering to noise.
It should be understood that above general description and following detailed description are only exemplary and explanatory, not
The disclosure can be limited.
Description of the drawings
Attached drawing herein is incorporated into specification and forms the part of this specification, shows the implementation for meeting the disclosure
Example, and for explaining the principle of the disclosure together with specification.
Fig. 1 is the flow chart according to a kind of denoising method of touch-tone signal shown in an exemplary embodiment.
Fig. 2 is the flow chart according to the denoising method of another touch-tone signal shown in an exemplary embodiment.
Fig. 3 is the block diagram according to a kind of denoising device of touch-tone signal shown in an exemplary embodiment.
Fig. 4 is the block diagram according to the denoising device of another touch-tone signal shown in an exemplary embodiment.
Fig. 5 is the block diagram according to the denoising device of another touch-tone signal shown in an exemplary embodiment.
Fig. 6 is the block diagram according to the denoising device of another touch-tone signal shown in an exemplary embodiment.
Fig. 7 is the block diagram according to the denoising device of another touch-tone signal shown in an exemplary embodiment.
Fig. 8 is shown according to an a kind of structure of denoising device for touch-tone signal shown in an exemplary embodiment
It is intended to.
Specific embodiment
Here exemplary embodiment will be illustrated in detail, example is illustrated in the accompanying drawings.Following description is related to
During attached drawing, unless otherwise indicated, the same numbers in different attached drawings represent the same or similar element.Following exemplary embodiment
Described in embodiment do not represent all embodiments consistent with the disclosure.On the contrary, they be only with it is such as appended
The example of the consistent device and method of some aspects be described in detail in claims, the disclosure.
Fig. 1 is the flow chart according to a kind of denoising method of touch-tone signal shown in an exemplary embodiment.
It please refers to Fig.1, the denoising method of the touch-tone signal can be applied in terminal, and the terminal can include
The smart machines such as smart mobile phone, tablet computer, PDA (Personal Digital Assistant, palm PC).The double-tone
The denoising method of multiple-frequency signal may comprise steps of：
In step S101, wavelet transform is carried out to original touch-tone signal, to obtain transformation signal.
In the present embodiment, terminal receives the original touch-tone signal that server-side is sent, the original dual-tone multifrequency letter
Noise has been generally comprised in number.
In this step, in order to effectively distinguish the useful signal and noise signal in touch-tone signal, terminal can be right
The original touch-tone signal carries out wavelet transformation, optionally, includes for frequency signal each in touch-tone signal
The characteristics of one high frequency coefficient and a low frequency coefficient, terminal can carry out discrete wavelet to the original touch-tone signal
Transformation, as much as possible to detach the noise signal in touch-tone signal.For purposes of illustration only, after wavelet transform being carried out
Obtained touch-tone signal is known as converting signal.Optionally, terminal can carry out the original touch-tone signal one-dimensional
Wavelet transform, terminal can also carry out two-dimensional discrete wavelet conversion to the original touch-tone signal.For another example：Terminal
Wavelet transform can be carried out under wavelet basis dbN to the original touch-tone signal, N can also take using value as 3
It is 4 etc. to be worth, and the disclosure is not particularly limited this.
In step s 102, the transformation signal is filtered according to preset filter condition.
Based on abovementioned steps S101, terminal is obtaining transformation signal to original touch-tone signal progress wavelet transform
Afterwards, the noise in the transformation signal can be filtered according to preset filter condition.
In the present embodiment, the filter condition can be configured by developer, such as：It can be by the filtering rod
Part is set as the frequency that filtration frequencies coefficient is less than low frequency coefficient more than the frequency signal and filtration frequencies coefficient of high frequency coefficient
Signal, then in this step, terminal can be filtered in the transformation signal higher than high frequency coefficient or the frequency less than low frequency coefficient
The corresponding frequency signal of rate coefficient.
In step s 103, discrete wavelet inverse transformation is carried out to the transformation signal after filtering, to obtain the double-tone after denoising
Multiple-frequency signal.
Based on abovementioned steps S102, after being filtered to the transformation signal, terminal can be to the transformation signal after filtering
Carry out discrete wavelet inverse transformation processing.In this step, the discrete wavelet contravariant is changed to discrete wavelet in abovementioned steps S101
The inverse process of transformation.If using one-dimensinal discrete small wave transformation in step S101, in this step, using it is one-dimensional from
Inverse wavelet transform is dissipated, if using the wavelet transform carried out under wavelet basis dbN in step S101, in this step
In rapid, using the discrete wavelet inverse transformation carried out under wavelet basis dbN.
The application terminal first can carry out discrete wavelet transformer to original touch-tone signal it can be seen from above description
It changes, to obtain transformation signal, then the transformation signal is filtered, then to the change after filtering according to preset filter condition
It changes signal and carries out discrete wavelet inverse transformation, it is more so as to improve double-tone to remove the noise to being included in original touch-tone signal
The recognition efficiency and recognition accuracy of frequency signal.
Fig. 2 is the flow chart according to the denoising method of another touch-tone signal shown in an exemplary embodiment.
It please refers to Fig.2, the denoising method of the touch-tone signal can be applied in terminal, and the terminal can include
The smart machines such as smart mobile phone, tablet computer, PDA (Personal Digital Assistant, palm PC).The double-tone
The denoising method of multiple-frequency signal may comprise steps of：
In step s 201, one-dimensinal discrete small wave transformation is carried out under wavelet basis db3 to original touch-tone signal, with
To transformation signal.
In the present embodiment, calling terminal to the server-side of service provider after call request is sent, service provider
Server-side the call request can be transmitted to the server-side of operator, the server-side of operator is connected being established with called terminal
Afterwards, the called number of called terminal can be sent to calling terminal by touch-tone signal, calling terminal identifies the double-tone
Multiple-frequency signal is to obtain called number.
In the present embodiment, the touch-tone signal comprising called number that calling terminal receives is known as original double-tone
Multiple-frequency signal has generally included noise in the original touch-tone signal.Calling terminal is to receive the original double-tone more
After frequency signal, one-dimensinal discrete small wave transformation can be carried out under wavelet basis db3 to the original touch-tone signal, so as to institute
It states original touch-tone signal and carries out denoising.In the present embodiment, for purposes of illustration only, one will be carried out under wavelet basis db3
The obtained touch-tone signal after wavelet transform is tieed up to be known as converting signal.
In step S202, judge whether the coefficient of frequency that the transformation signal includes is higher than high frequency coefficient or less than low frequency
Coefficient.When the coefficient of frequency that the transformation signal includes is higher than high frequency coefficient or less than low frequency coefficient, step S203 is performed.When
When the coefficient of frequency that the transformation signal includes is not higher than high frequency coefficient and is not less than low frequency coefficient, step S204 is performed.
In the present embodiment, include can include in a complete original touch-tone signal of called number it is more
A frequency signal, wherein, there are one coefficient of frequencies for each frequency signal correspondence.As an example it is assumed that the called number is
The number of two, for dual-tone multifrequency technology, a number is corresponded to there are two frequency signal, that is, there are two frequency systems for correspondence
Number then in theory, is included in the original touch-tone signal comprising two called numbers there are four frequency signal, this four
There are four coefficient of frequencies for a frequency signal correspondence.Due to having further included noise in the original touch-tone signal, so described
Include the frequency signal that quantity is more than four in original touch-tone signal.And based on the conversion process of abovementioned steps S201,
Also include the frequency signal that quantity is more than four in the transformation signal of the obtained original touch-tone signal.
In this step, it can judge whether the corresponding coefficient of frequency of each frequency signal is high in the transformation signal successively
In high frequency coefficient or whether it is less than low frequency coefficient.Wherein, the high frequency coefficient and the low frequency coefficient can be by developers
It is configured.Optionally, with reference to international standard, the high frequency coefficient can be set as 1633, the low frequency coefficient is set
It is 697.Certainly, those skilled in the art can also set the high frequency coefficient and low frequency coefficient of other numerical value, and the disclosure is to this
It is not particularly limited.
In this step, when in the transformation signal there are coefficient of frequency higher than the high frequency coefficient or low less than described
During the coefficient of frequency of frequency coefficient, step S203 is performed.To be higher than the high frequency system when there is no coefficient of frequencies in the transformation signal
When number or the coefficient of frequency less than the low frequency coefficient, step S204 is performed.
In step S203, the corresponding frequency signal of coefficient of frequency described in the transformation signal is filtered.
Based on the judging result of abovementioned steps S202, to be higher than the high frequency system when there are coefficient of frequencies in the transformation signal
When number or the coefficient of frequency less than the low frequency coefficient, in this step, filtering is higher than the high frequency coefficient or less than institute
State the corresponding frequency signal of coefficient of frequency of low frequency coefficient.
As an example it is assumed that high frequency coefficient is 1633, low frequency coefficient 697, described convert in signal includes 5 frequencies
Signal, this corresponding coefficient of frequency of 5 frequency signals are respectively：720、840、160、1600、1628.Wherein, coefficient of frequency 160
Less than the low frequency coefficient, then in this step, the frequency signal that coefficient of frequency is 160 is filtered out, then the transformation after filtering
Include 4 frequency signals in signal.
In the present embodiment, terminal can be converted by filtering is higher than high frequency coefficient or the frequency less than low frequency coefficient in signal
The corresponding frequency signal of rate coefficient, with filter high frequency noise and low-frequency noise, so as to fulfill comprehensive filtering to noise.
In step S204, one-dimensional discrete inverse wavelet transform is carried out under wavelet basis db3 to the transformation signal after filtering, with
Obtain the touch-tone signal after denoising.
In this step, the inverse process of wavelet transform in abovementioned steps S201 is performed, to the transformation signal after filtering
One-dimensional discrete inverse wavelet transform is carried out under wavelet basis db3, to obtain the touch-tone signal after denoising.
In step S205, the touch-tone signal after denoising is identified.
Based on abovementioned steps S204, after the touch-tone signal after obtaining denoising, in this step, calling terminal identifies
Touch-tone signal after the denoising, to obtain called number.
The application terminal first can carry out discrete wavelet transformer to original touch-tone signal it can be seen from above description
It changes, to obtain transformation signal, then the transformation signal is filtered, then to the change after filtering according to preset filter condition
It changes signal and carries out discrete wavelet inverse transformation, it is more so as to improve double-tone to remove the noise to being included in original touch-tone signal
The recognition efficiency and recognition accuracy of frequency signal.
Corresponding with the denoising method embodiment of aforementioned touch-tone signal, the disclosure additionally provides touch-tone signal
The embodiment of denoising device.
Fig. 3 is the block diagram according to a kind of denoising device of touch-tone signal shown in an exemplary embodiment.
It please refers to Fig.3, the denoising device 300 of the touch-tone signal can be used in terminal, include：Conversion module
301st, filtering module 302 and inverse transform block 303.
Wherein, the conversion module 301 is configured as：Wavelet transform is carried out to original touch-tone signal, with
To transformation signal；
The filtering module 302 is configured as：The transformation signal is filtered according to preset filter condition；
The inverse transform block 303 is configured as：Discrete wavelet inverse transformation is carried out to the transformation signal after filtering, to obtain
Touch-tone signal after denoising.
In above-described embodiment, terminal first can carry out wavelet transform to original touch-tone signal, to be converted
Signal, then according to preset filter condition to it is described transformation signal be filtered, then the transformation signal after filtering is carried out from
Inverse wavelet transform is dissipated, to remove the noise to being included in original touch-tone signal, so as to improve the identification of touch-tone signal
Efficiency and recognition accuracy.
Fig. 4 is the block diagram according to the denoising device of another touch-tone signal shown in an exemplary embodiment.
It please refers to Fig.4, on the basis of aforementioned embodiment shown in Fig. 3, the filtering module 302 can wrap the embodiment
It includes：Judging submodule 3021 and filter submodule 3022.
Wherein, the judging submodule 3021 is configured as：Judge whether the coefficient of frequency that the transformation signal includes is high
In high frequency coefficient or less than low frequency coefficient；
The filter submodule 3022 is configured as：The coefficient of frequency that includes of transformation signal higher than high frequency coefficient or
During less than low frequency coefficient, the corresponding frequency signal of coefficient of frequency described in the transformation signal is filtered.
In above-described embodiment, terminal can be converted by filtering is higher than high frequency coefficient or the frequency less than low frequency coefficient in signal
The corresponding frequency signal of rate coefficient, with filter high frequency noise and low-frequency noise, so as to fulfill comprehensive filtering to noise.
Fig. 5 is the block diagram according to the denoising device of another touch-tone signal shown in an exemplary embodiment.
Fig. 5 is please referred to, on the basis of aforementioned embodiment shown in Fig. 3, the conversion module 301 can wrap the embodiment
It includes：Transformation submodule 3011.
Wherein, the transformation submodule 3011 is configured as：To the original touch-tone signal under wavelet basis db3 into
Row one-dimensinal discrete small wave transformation.
It should be noted that the transformation submodule 3011 shown in above-mentioned embodiment shown in fig. 5 can also include
In aforementioned device embodiment shown in Fig. 4, the disclosure is not particularly limited this.
Fig. 6 is the block diagram according to the denoising device of another touch-tone signal shown in an exemplary embodiment.
Fig. 6 is please referred to, for the embodiment on the basis of aforementioned embodiment shown in Fig. 3, the inverse transform block 303 can be with
Including：Inverse transformation submodule 3031.
Wherein, the inverse transformation submodule 3031 is configured as：Transformation signal after filtering is carried out under wavelet basis db3
One-dimensional discrete inverse wavelet transform.
It should be noted that the inverse transformation submodule 3031 shown in above-mentioned embodiment shown in fig. 5 can also wrap
It includes in earlier figures 4 or device embodiment shown in fig. 5, the disclosure is not particularly limited this.
Fig. 7 is the block diagram according to the denoising device of another touch-tone signal shown in an exemplary embodiment.
Fig. 7 is please referred to, on the basis of aforementioned embodiment shown in Fig. 3, the touch-tone signal is gone the embodiment
Device 300 of making an uproar can also include：Identification module 304.
The identification module 304 is configured as：Identify the touch-tone signal after denoising.
It should be noted that before the identification module 304 shown in above-mentioned embodiment shown in Fig. 7 can also be included in
It states in any device embodiment shown in fig. 4 to fig. 6, the disclosure is not particularly limited this.
The function of each unit and the realization process of effect specifically refer to and step are corresponded in the above method in above device
Realization process, details are not described herein.
For device embodiment, since it corresponds essentially to embodiment of the method, so related part is referring to method reality
Apply the part explanation of example.The apparatus embodiments described above are merely exemplary, wherein described be used as separating component
The unit of explanation may or may not be physically separate, and the component shown as unit can be or can also
It is not physical unit, you can be located at a place or can also be distributed in multiple network element.It can be according to reality
It needs that some or all of module therein is selected to realize the purpose of disclosure scheme.Those of ordinary skill in the art are not paying
In the case of going out creative work, you can to understand and implement.
Correspondingly, the disclosure also provides a kind of denoising device of touch-tone signal, described device includes：Processor；With
In the memory of storage processor-executable instruction；Wherein, the processor is configured as：Original touch-tone signal is carried out
Wavelet transform, to obtain transformation signal；The transformation signal is filtered according to preset filter condition；After filtering
Transformation signal carry out discrete wavelet inverse transformation, to obtain the touch-tone signal after denoising.
Correspondingly, the disclosure also provides a kind of non-transitorycomputer readable storage medium, when in the storage medium
When instruction is performed by the processor of terminal so that terminal is able to carry out a kind of denoising method of touch-tone signal, the method
Including：Wavelet transform is carried out to original touch-tone signal, to obtain transformation signal；According to preset filter condition to institute
Transformation signal is stated to be filtered；Discrete wavelet inverse transformation is carried out to the transformation signal after filtering, it is more to obtain the double-tone after denoising
Frequency signal.
Fig. 8 is the block diagram according to a kind of denoising device 800 for touch-tone signal shown in an exemplary embodiment.
For example, device 800 can be mobile phone, computer, digital broadcast terminal, messaging devices, game console, tablet sets
It is standby, Medical Devices, body-building equipment, personal digital assistant etc..
With reference to Fig. 8, device 800 can include following one or more components：Processing component 802, memory 804, power supply
Component 806, multimedia component 808, audio component 810, the interface 812 of input/output (I/O), sensor module 814 and
Communication component 816.
The integrated operation of 802 usual control device 800 of processing component, such as with display, call, data communication, phase
Machine operates and record operates associated operation.Processing element 802 can refer to including one or more processors 820 to perform
It enables, to perform all or part of the steps of the methods described above.In addition, processing component 802 can include one or more modules, just
Interaction between processing component 802 and other assemblies.For example, processing component 802 can include multi-media module, it is more to facilitate
Interaction between media component 808 and processing component 802.
Memory 804 is configured as storing various types of data to support the operation in equipment 800.These data are shown
Example includes the instruction of any application program or method for being operated on device 800, contact data, and telephone book data disappears
Breath, picture, video etc..Memory 804 can be by any kind of volatibility or non-volatile memory device or their group
It closes and realizes, such as static RAM (SRAM), electrically erasable programmable read-only memory (EEPROM) is erasable to compile
Journey read-only memory (EPROM), programmable read only memory (PROM), read-only memory (ROM), magnetic memory, flash
Device, disk or CD.
Electric power assembly 806 provides electric power for the various assemblies of device 800.Electric power assembly 806 can include power management system
System, one or more power supplys and other generate, manage and distribute electric power associated component with for device 800.
Multimedia component 808 is included in the screen of one output interface of offer between described device 800 and user.One
In a little embodiments, screen can include liquid crystal display (LCD) and touch panel (TP).If screen includes touch panel, screen
Curtain may be implemented as touch screen, to receive input signal from the user.Touch panel includes one or more touch sensings
Device is to sense the gesture on touch, slide, and touch panel.The touch sensor can not only sense touch or sliding action
Boundary, but also detect duration and pressure associated with the touch or slide operation.In some embodiments, more matchmakers
Body component 808 includes a front camera and/or rear camera.When equipment 800 is in operation mode, such as screening-mode or
During video mode, front camera and/or rear camera can receive external multi-medium data.Each front camera and
Rear camera can be a fixed optical lens system or have focusing and optical zoom capabilities.
Audio component 810 is configured as output and/or input audio signal.For example, audio component 810 includes a Mike
Wind (MIC), when device 800 is in operation mode, during such as call model, logging mode and speech recognition mode, microphone by with
It is set to reception external audio signal.The received audio signal can be further stored in memory 804 or via communication set
Part 816 is sent.In some embodiments, audio component 810 further includes a loud speaker, for exports audio signal.
I/O interfaces 812 provide interface between processing component 802 and peripheral interface module, and above-mentioned peripheral interface module can
To be keyboard, click wheel, button etc..These buttons may include but be not limited to：Home button, volume button, start button and lock
Determine button.
Sensor module 814 includes one or more sensors, and the state for providing various aspects for device 800 is commented
Estimate.For example, sensor module 814 can detect opening/closed state of equipment 800, and the relative positioning of component, for example, it is described
Component is the display and keypad of device 800, and sensor module 814 can be with 800 1 components of detection device 800 or device
Position change, the existence or non-existence that user contacts with device 800,800 orientation of device or acceleration/deceleration and device 800
Temperature change.Sensor module 814 can include proximity sensor, be configured to detect without any physical contact
Presence of nearby objects.Sensor module 814 can also include optical sensor, such as CMOS or ccd image sensor, for into
As being used in application.In some embodiments, which can also include acceleration transducer, gyro sensors
Device, Magnetic Sensor, pressure sensor or temperature sensor.
Communication component 816 is configured to facilitate the communication of wired or wireless way between device 800 and other equipment.Device
800 can access the wireless network based on communication standard, such as WiFi, 2G or 3G or combination thereof.In an exemplary implementation
In example, communication component 816 receives broadcast singal or broadcast related information from external broadcasting management system via broadcast channel.
In one exemplary embodiment, the communication component 816 further includes near-field communication (NFC) module, to promote short range communication.Example
Such as, NFC module can be based on radio frequency identification (RFID) technology, Infrared Data Association (IrDA) technology, ultra wide band (UWB) technology,
Bluetooth (BT) technology and other technologies are realized.
In the exemplary embodiment, device 800 can be believed by one or more application application-specific integrated circuit (ASIC), number
Number processor (DSP), digital signal processing appts (DSPD), programmable logic device (PLD), field programmable gate array
(FPGA), controller, microcontroller, microprocessor or other electronic components are realized, for performing the above method.
In the exemplary embodiment, a kind of non-transitorycomputer readable storage medium including instructing, example are additionally provided
Such as include the memory 804 of instruction, above-metioned instruction can be performed to complete the above method by the processor 820 of device 800.For example,
The non-transitorycomputer readable storage medium can be ROM, random access memory (RAM), CD-ROM, tape, floppy disk
With optical data storage devices etc..
Those skilled in the art will readily occur to the disclosure its after considering specification and putting into practice disclosure disclosed herein
Its embodiment.This application is intended to cover any variations, uses, or adaptations of the disclosure, these modifications, purposes or
Person's adaptive change follows the general principle of the disclosure and including the undocumented common knowledge in the art of the disclosure
Or conventional techniques.Description and embodiments are considered only as illustratively, and the true scope and spirit of the disclosure are by following
Claim is pointed out.
It should be understood that the present disclosure is not limited to the precise structures that have been described above and shown in the drawings, and
And various modifications and changes may be made without departing from the scope thereof.The scope of the present disclosure is only limited by appended claim.
Claims (9)
1. a kind of denoising method of touch-tone signal, which is characterized in that including：
Wavelet transform is carried out to original touch-tone signal, to obtain transformation signal；
The transformation signal is filtered according to preset filter condition；
Discrete wavelet inverse transformation is carried out to the transformation signal after filtering, to obtain the touch-tone signal after denoising；
It is described that the transformation signal is filtered according to preset filter condition, including：
Judge whether the coefficient of frequency that the transformation signal includes is higher than high frequency coefficient or less than low frequency coefficient；
If the coefficient of frequency that the transformation signal includes filters the transformation letter higher than high frequency coefficient or less than low frequency coefficient
The corresponding frequency signal of coefficient of frequency described in number.
2. denoising method according to claim 1, which is characterized in that described that small echo change is carried out to original touch-tone signal
It changes, including：
One-dimensinal discrete small wave transformation is carried out under wavelet basis db3 to the original touch-tone signal.
3. denoising method according to claim 2, which is characterized in that the transformation signal after described pair of filtering carries out discrete small
Wave inverse transformation, including：
One-dimensional discrete inverse wavelet transform is carried out under wavelet basis db3 to the transformation signal after filtering.
4. denoising method according to claim 1, which is characterized in that further include：
Identify the touch-tone signal after denoising.
5. a kind of denoising device of touch-tone signal, which is characterized in that including：
Conversion module is configured as carrying out wavelet transform to original touch-tone signal, to obtain transformation signal；
Filtering module is configured as being filtered the transformation signal according to preset filter condition；
Inverse transform block is configured as carrying out discrete wavelet inverse transformation to the transformation signal after filtering, double after denoising to obtain
Sound multiple-frequency signal；
The filtering module includes：
Judging submodule is configured as judging whether the coefficient of frequency that the transformation signal includes is higher than high frequency coefficient or less than low
Frequency coefficient；
Filter submodule is configured as being higher than high frequency coefficient or less than low frequency coefficient in the coefficient of frequency that the transformation signal includes
When, filter the corresponding frequency signal of coefficient of frequency described in the transformation signal.
6. denoising device according to claim 5, which is characterized in that the conversion module includes：
Transformation submodule is configured as carrying out one-dimensional discrete small echo change under wavelet basis db3 to the original touch-tone signal
It changes.
7. denoising device according to claim 6, which is characterized in that the inverse transform block includes：
Inverse transformation submodule is configured as carrying out one-dimensional discrete small echo contravariant under wavelet basis db3 to the transformation signal after filtering
It changes.
8. denoising device according to claim 7, which is characterized in that further include：
Identification module, the touch-tone signal being configured as after identification denoising.
9. a kind of denoising device of touch-tone signal, which is characterized in that including：
Processor；
For storing the memory of processor-executable instruction；
Wherein, the processor is configured as：
Wavelet transform is carried out to original touch-tone signal, to obtain transformation signal；
The transformation signal is filtered according to preset filter condition；
Discrete wavelet inverse transformation is carried out to the transformation signal after filtering, to obtain the touch-tone signal after denoising；
It is described that the transformation signal is filtered according to preset filter condition, including：
Judge whether the coefficient of frequency that the transformation signal includes is higher than high frequency coefficient or less than low frequency coefficient；
If the coefficient of frequency that the transformation signal includes filters the transformation letter higher than high frequency coefficient or less than low frequency coefficient
The corresponding frequency signal of coefficient of frequency described in number.
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