WO2015196434A1 - 一种降噪方法、装置及移动终端 - Google Patents

一种降噪方法、装置及移动终端 Download PDF

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Publication number
WO2015196434A1
WO2015196434A1 PCT/CN2014/080885 CN2014080885W WO2015196434A1 WO 2015196434 A1 WO2015196434 A1 WO 2015196434A1 CN 2014080885 W CN2014080885 W CN 2014080885W WO 2015196434 A1 WO2015196434 A1 WO 2015196434A1
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WO
WIPO (PCT)
Prior art keywords
mobile terminal
signal
vibration waveform
resistor
noise reduction
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Application number
PCT/CN2014/080885
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English (en)
French (fr)
Inventor
赵文龙
Original Assignee
华为技术有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to CN201480046581.0A priority Critical patent/CN105474306A/zh
Priority to US15/321,210 priority patent/US10089972B2/en
Priority to PCT/CN2014/080885 priority patent/WO2015196434A1/zh
Publication of WO2015196434A1 publication Critical patent/WO2015196434A1/zh

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Classifications

    • GPHYSICS
    • G06COMPUTING; CALCULATING OR COUNTING
    • G06FELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/16Sound input; Sound output
    • G06F3/165Management of the audio stream, e.g. setting of volume, audio stream path
    • GPHYSICS
    • G10MUSICAL INSTRUMENTS; ACOUSTICS
    • G10KSOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/16Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/175Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
    • G10K11/178Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
    • G10K11/1785Methods, e.g. algorithms; Devices
    • GPHYSICS
    • G10MUSICAL INSTRUMENTS; ACOUSTICS
    • G10KSOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/16Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/175Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
    • G10K11/178Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
    • G10K11/1785Methods, e.g. algorithms; Devices
    • G10K11/17853Methods, e.g. algorithms; Devices of the filter
    • GPHYSICS
    • G10MUSICAL INSTRUMENTS; ACOUSTICS
    • G10KSOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/16Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/175Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
    • G10K11/178Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
    • G10K11/1787General system configurations
    • G10K11/17873General system configurations using a reference signal without an error signal, e.g. pure feedforward
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04RLOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R3/00Circuits for transducers, loudspeakers or microphones
    • H04R3/02Circuits for transducers, loudspeakers or microphones for preventing acoustic reaction, i.e. acoustic oscillatory feedback
    • GPHYSICS
    • G10MUSICAL INSTRUMENTS; ACOUSTICS
    • G10KSOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K2210/00Details of active noise control [ANC] covered by G10K11/178 but not provided for in any of its subgroups
    • G10K2210/10Applications
    • G10K2210/108Communication systems, e.g. where useful sound is kept and noise is cancelled
    • GPHYSICS
    • G10MUSICAL INSTRUMENTS; ACOUSTICS
    • G10KSOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K2210/00Details of active noise control [ANC] covered by G10K11/178 but not provided for in any of its subgroups
    • G10K2210/10Applications
    • G10K2210/129Vibration, e.g. instead of, or in addition to, acoustic noise
    • GPHYSICS
    • G10MUSICAL INSTRUMENTS; ACOUSTICS
    • G10KSOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K2210/00Details of active noise control [ANC] covered by G10K11/178 but not provided for in any of its subgroups
    • G10K2210/30Means
    • G10K2210/301Computational
    • G10K2210/3044Phase shift, e.g. complex envelope processing
    • GPHYSICS
    • G10MUSICAL INSTRUMENTS; ACOUSTICS
    • G10KSOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K2210/00Details of active noise control [ANC] covered by G10K11/178 but not provided for in any of its subgroups
    • G10K2210/30Means
    • G10K2210/301Computational
    • G10K2210/3056Variable gain
    • GPHYSICS
    • G10MUSICAL INSTRUMENTS; ACOUSTICS
    • G10KSOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K2210/00Details of active noise control [ANC] covered by G10K11/178 but not provided for in any of its subgroups
    • G10K2210/30Means
    • G10K2210/321Physical
    • G10K2210/3226Sensor details, e.g. for producing a reference or error signal
    • GPHYSICS
    • G10MUSICAL INSTRUMENTS; ACOUSTICS
    • G10KSOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K2210/00Details of active noise control [ANC] covered by G10K11/178 but not provided for in any of its subgroups
    • G10K2210/50Miscellaneous
    • G10K2210/501Acceleration, e.g. for accelerometers
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04RLOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2499/00Aspects covered by H04R or H04S not otherwise provided for in their subgroups
    • H04R2499/10General applications
    • H04R2499/11Transducers incorporated or for use in hand-held devices, e.g. mobile phones, PDA's, camera's

Definitions

  • the present invention relates to the field of mobile terminals, and in particular, to a noise reduction method, apparatus, and mobile terminal. Background technique
  • Hearing is that the sound is collected through the external auricle to the external auditory canal, causing the tympanic membrane to vibrate, which in turn drives the hammer bone movement, which is transmitted to the anvil and the tibia, and then transmitted to the auditory nerve.
  • Sounds include the sounds people want to hear, and the sounds that they don't want to hear, noise.
  • the hearing of noise formation often causes problems for people. For example, when people listen to audio output from machines such as mobile terminals, the entry of noise can affect the effect of people listening to audio, making people feel annoyed and even affect people's health.
  • the current noise reduction method only considers the noise transmitted in the environmental space, and does not consider the noise transmitted by other methods. Therefore, the effect of the current noise reduction method has certain limitations, and the effect is not satisfactory. Summary of the invention
  • the present invention provides a noise reduction method, apparatus, and mobile terminal.
  • the technical solution is as follows:
  • the present invention provides a mobile terminal, including a processor, an audio output device for outputting audio, and a sensor for collecting an acceleration signal of the mobile terminal, where the mobile terminal further includes a noise reduction signal determination Circuit and coupling circuit,
  • the noise reduction signal determining circuit is configured to obtain an acceleration signal of the mobile terminal when the audio output device is in an active state, and determine a vibration waveform of the mobile terminal when the vibration occurs according to the acceleration signal, and then Inverting the determined vibration waveform to obtain the same noise reduction signal as the reversed vibration waveform waveform; wherein the acceleration signal is collected by the sensor; The noise reduction signal is superimposed to the audio to be output by the audio output device.
  • the noise reduction signal determining circuit includes:
  • Resistor Rl Resistor Rl, resistor R2, resistor R3, resistor R4, capacitor Cl, capacitor C2, capacitor C3, An amplifier Ul, and an operational amplifier U2;
  • the first end of the resistor R1 is input with the acceleration signal, and the second end of the resistor R1 is electrically connected to the non-inverting input end of the operational amplifier U1 and the first end of the capacitor C1, respectively.
  • the second end is grounded;
  • the first end of the resistor R2 is grounded, and the second end of the resistor R2 is electrically connected to the inverting input end of the operational amplifier U1 and the first end of the capacitor C2, respectively, and the output end of the operational amplifier U1 Electrically connected to the first end of the resistor R3 and the second end of the capacitor C2;
  • the second end of the resistor R3 is electrically connected to the inverting input end of the operational amplifier U2 and the first end of the capacitor C3, the first end of the resistor R4 is grounded, and the second end of the resistor R4 is The non-inverting input terminal of the operational amplifier U2 is electrically connected; the output end of the operational amplifier U2 is connected to the second end of the capacitor C3.
  • the phase shifting circuit comprises a resistor R5 and a capacitor C4;
  • the output terminal of the operational amplifier U1 is electrically connected to the first end of the resistor R3 through the resistor R5;
  • the first end of the resistor R5 is electrically connected to the output end of the operational amplifier U1 and the second end of the capacitor C2, respectively; the second end of the resistor R5 is electrically connected to the first end of the resistor R3, The first end of the capacitor C4 is grounded, and the second end of the capacitor C4 is connected between the resistor R5 and the resistor R3.
  • the hybrid circuit includes a capacitor C5
  • the present invention provides a noise reduction device, which is suitable for a mobile terminal, and the mobile terminal is provided with an audio output device and a sensor for outputting audio, and the device includes:
  • An obtaining module configured to obtain an acceleration signal of the mobile terminal when the audio output device is in an active state, where an acceleration signal of the mobile terminal is collected by the sensor; Determining an acceleration signal to determine vibration of the mobile terminal when vibration occurs Dynamic waveform
  • a reverse module configured to invert the determined vibration waveform to obtain a same noise reduction signal as the reversed waveform waveform
  • the determining module includes: a first calculating unit, configured to calculate a rate signal according to the acceleration signal;
  • a second calculating unit configured to calculate a displacement signal according to the rate signal, and obtain a vibration waveform when the mobile terminal vibrates.
  • the reverse module is further configured to advance or backward the phase of the determined vibration waveform.
  • the determining module is configured to:
  • the present invention provides a noise reduction method, which is applicable to a mobile terminal, where the mobile terminal is provided with an audio output device for outputting audio, and the method includes:
  • the audio output device When the audio output device is in an active state, collecting an acceleration signal of the mobile terminal; determining, according to the acceleration signal, a vibration waveform when the mobile terminal vibrates; and reversing the determined vibration waveform, Obtaining the same noise reduction signal as the inverted waveform waveform;
  • the noise reduction signal is superimposed to the audio to be output by the audio output device.
  • the determining, according to the acceleration signal, the vibration waveform when the mobile terminal vibrates includes:
  • the method further includes:
  • determining, according to the acceleration signal, a vibration waveform when the mobile terminal vibrates Previously the method further includes:
  • the acceleration signal is adjusted such that the amplitude of the adjusted acceleration signal is within a predetermined amplitude range.
  • the technical solution provided by the embodiment of the present invention has the following beneficial effects: when the audio output device is in an active state, obtaining an acceleration signal of the mobile terminal; and determining, according to the acceleration signal, a vibration waveform when the mobile terminal vibrates; the vibration waveform can be used Measuring the vibration waveform of the human skeleton; inverting the determined vibration waveform to obtain the same noise reduction signal as the inverted vibration waveform waveform, and superimposing the noise reduction signal on the audio output device to be outputted; The rear vibration waveform neutralizes the vibration waveform of the human skeleton, thus reducing and eliminating the noise generated by the bone vibration, thereby improving the effect of people listening to audio.
  • FIG. 1 is a flowchart of a noise reduction method according to an embodiment of the present invention
  • FIG. 2 is a schematic structural diagram of a mobile terminal according to an embodiment of the present invention.
  • FIG. 3 and FIG. 4 are flowcharts of still another noise reduction method according to an embodiment of the present invention.
  • FIG. 5 is a schematic structural diagram of a noise reduction device according to an embodiment of the present invention.
  • FIG. 6 is a schematic structural diagram of still another noise reduction device according to an embodiment of the present invention.
  • FIG. 7 is a schematic structural diagram of still another mobile terminal according to an embodiment of the present invention.
  • FIG. 8 is a schematic structural diagram of a noise reduction signal determining circuit and a coupling circuit according to an embodiment of the present invention
  • FIG. 9 is a schematic diagram of a phase shifting circuit according to an embodiment of the present invention.
  • the noise transmitted in the space other than the environmental space is first introduced.
  • a person When a person is in a vibrating environment such as a car or train, the human bones will vibrate.
  • the vibration of the bone is transmitted directly to the anvil and tibia, and is transmitted to the auditory nerve to form a hearing.
  • This kind of hearing is unharmonious with respect to the hearing produced by the audio output by the mobile terminal, and belongs to noise that people do not want to hear. Since the MIC cannot collect the noise generated by the vibration of the bone, the existing noise reduction method cannot reduce and eliminate the noise generated by the bone vibration, and the noise reduction effect is not ideal.
  • the mobile terminal includes a smartphone, a notebook computer, and a tablet computer.
  • the audio output device includes a karaoke, an earpiece, and an earplug provided on the mobile terminal.
  • FIG. 1 shows a noise reduction method provided by an embodiment of the present invention. The noise reduction method is applied to a mobile terminal having an audio output device for outputting audio. Referring to Figure 1, the method flow includes:
  • Step 101 Obtain an acceleration signal of the mobile terminal when the audio output device is in an active state.
  • Step 102 Determine a vibration waveform when the mobile terminal vibrates according to the acceleration signal.
  • Step 103 Invert the determined vibration waveform to obtain the same noise reduction signal as the inverted vibration waveform.
  • Step 104 Superimpose the noise reduction signal to the audio to be output by the audio output device.
  • the acceleration signal of the mobile terminal is obtained; and the vibration waveform when the mobile terminal vibrates is determined according to the acceleration signal; the vibration waveform can be used to measure the vibration waveform of the human skeleton; The determined vibration waveform is reversed, and the same noise reduction signal as that of the reversed vibration waveform is obtained, and the noise reduction signal is superimposed on the audio to be outputted by the audio output device; since the reverse vibration waveform can be used for the human skeleton The vibration waveform is neutralized, thus reducing and eliminating the noise generated by bone vibration, thereby improving the effect of people listening to audio.
  • There are at least two hardware design methods for implementing the noise reduction method of the embodiment of the present invention which are respectively introduced below. Those skilled in the art will appreciate that this does not constitute a limitation thereto.
  • FIG. 2 shows a mobile terminal according to an embodiment of the present invention.
  • the mobile terminal includes at least one processor 201 (for example, a CPU), a memory 202, an audio output device 203, and at least one.
  • Communication bus 204 and at least one sensor 205 are shown in Figure 2, or that some components are combined, or different component arrangements.
  • Processor 201 memory 202, audio output device 203, sensor 205, and communication bus
  • the communication bus 204 is used to implement connection communication between the processor 201, the memory 202, the audio output device 203, and the sensor 205.
  • the sensor 205 is configured to detect the motion state of the mobile terminal, such as collecting the acceleration of the mobile terminal.
  • Sensor 205 includes an acceleration sensor.
  • the memory 202 can be used to store software programs and application modules, and the processor 201 executes various functional applications of the mobile terminal and data processing by running software programs stored in the memory 202 and application modules.
  • the memory 202 can mainly include a storage program area and a storage data area, wherein the storage program area can store an operating system, an application required for at least one function (for example, determining a vibration waveform), and the like; the storage data area can be stored according to the usage of the mobile terminal. Created data (such as storing acceleration signals), etc.
  • the memory 202 may include a high speed RAM (random access memory), and may also include a non-volatile memory such as at least one magnetic disk storage device, a flash memory device, or other volatile solid state. Storage device.
  • the processor 201 is a control center of the mobile terminal that connects various portions of the entire mobile terminal using various interfaces and lines, by running or executing software programs and/or application modules stored in the memory 202, and calling stored in the memory 202.
  • the data performing various functions and processing data of the mobile terminal, thereby performing overall monitoring on the mobile terminal.
  • the noise reduction is implemented on the above mobile terminal in detail based on the method shown in FIG. FIG. 3 shows a noise reduction method provided by an embodiment of the present invention.
  • the noise reduction method is applied to a mobile terminal having an audio output device for outputting audio. Referring to Figure 3, the method flow includes:
  • Step 301 Acquire an acceleration signal of the mobile terminal when the audio output device is in an active state.
  • the acceleration sensor may be used to collect the acceleration of the mobile terminal to obtain an acceleration signal.
  • the mobile terminal Under the action of an external force, the mobile terminal will move to generate acceleration.
  • the mobile terminal will vibrate. Move, produce acceleration. Acceleration can also occur when the mobile terminal is moved linearly. Since the acceleration sensor is three-axis, the acceleration generated by the vibration of the mobile terminal is reflected in the Z-axis direction of the acceleration sensor when it is laid flat. Therefore, the acceleration generated during the vibration can be obtained in the following manner, and the acceleration sensor is sensed in the Z-axis direction.
  • the acceleration ignoring the acceleration induced in the X and Y directions. Obviously, if the mobile terminal is not subjected to external forces, the mobile terminal will be relatively stationary and its acceleration will be zero.
  • the acceleration signal can be sampled at a certain frequency, because the noise frequency of the vibration environment is generally less than 1 kHz, so the frequency of the acceleration signal is generally greater than 2 kHz.
  • Accelerometers also known as accelerometers, include capacitive accelerometers.
  • the capacitive acceleration sensor is a capacitance sensor based on the principle of capacitance. Since the manufacturing process of the capacitive acceleration sensor belongs to the Micro-Electro-Mechanical System (MEMS) process, the capacitive acceleration sensor can be mass-produced, thereby ensuring a low cost, so that the capacitive acceleration sensor can be It is commonly used on mobile terminals.
  • MEMS Micro-Electro-Mechanical System
  • the acceleration sensor can be simultaneously called to collect the acceleration of the mobile terminal.
  • the acceleration sensor is immediately called to collect the acceleration of the mobile terminal.
  • the obtained acceleration signal may be an analog signal or a digital signal.
  • Step 302 Adjust the acceleration signal so that the amplitude of the adjusted acceleration signal is within a predetermined amplitude range.
  • the acceleration signal when the amplitude of the acceleration signal is less than the predetermined amplitude range, the acceleration signal is amplified; when the amplitude of the acceleration signal is greater than the predetermined amplitude range, the acceleration signal is reduced.
  • the predetermined amplitude range may be set by the user through the mobile terminal, or may be set in the mobile terminal before the mobile terminal is shipped from the factory.
  • the suppression intensity of the noise generated by the bone vibration can be adjusted.
  • the amplification factor of the acceleration signal is larger, the suppression of the noise generated by the bone vibration is stronger.
  • the amplification factor of the acceleration signal is smaller or even smaller, the suppression of the noise generated by the bone vibration is weaker.
  • the acceleration signal can be adjusted using an amplifying circuit. It should be noted that the amplifying circuit is suitable for the amplification and reduction of the amplitude of the analog signal. If the acceleration signal to be adjusted is a digital signal, the digital signal can be converted to an analog signal by a digital-to-analog converter (DAC) before the acceleration signal is adjusted by the amplifying circuit.
  • DAC digital-to-analog converter
  • Step 303 Calculate the rate signal according to the adjusted acceleration signal.
  • the rate signal can be calculated according to equation (1).
  • Step 304 Calculate the displacement signal according to the rate signal, and obtain a vibration waveform when the mobile terminal vibrates.
  • the vibration waveform is a graphical representation of the displacement as a function of time (ie, the displacement signal). Therefore, the displacement signal is calculated, that is, the vibration waveform is calculated.
  • the displacement signal can be calculated according to equation (2). ( 2 )
  • the acceleration signal is the velocity signal, which is the displacement signal
  • A is the acceleration value of the i-th sample time
  • the time difference between two adjacent sample times, i takes 1, 2 or N, and N is a natural number.
  • the step 302-step 304 is implemented to determine the vibration waveform when the mobile terminal vibrates according to the acceleration signal.
  • the vibration waveform can be determined by the processor (see the embodiment shown in Fig. 2, Fig. 5 or Fig. 6), and the waveform can also be determined using a preset circuit (see the circuit shown in Fig. 7).
  • the processor determines the vibration waveform
  • the acceleration signal input to the processor is a digital signal
  • the vibration waveform is determined by the preset circuit
  • the acceleration signal input to the preset circuit is an analog signal.
  • Step 305 The phase of the determined vibration waveform is moved forward or backward, and the phase-shifted vibration waveform is reversed to obtain the same noise reduction signal as the inverted vibration waveform waveform.
  • the time when the vibration in the vibrating environment is transmitted to the ear through the bone and the time when the vibration waveform is output to the human ear may have a certain deviation, and there is a phase difference from the waveform. If the phase difference is too large, the noise reduction effect will be seriously affected. Therefore, the phase of the calculated vibration waveform can be moved forward or backward, and the phase value of the forward or backward shift can be set in advance. The worker can compare the effect of the test with the effect of the unmoved phase by multiplying the test of the phase forward or backward, and determine whether to advance or backward the phase and determine the phase value of the forward or backward shift.
  • the reverse operation may be performed first, and then the phase shift operation is performed.
  • This embodiment does not limit the sequence of the reverse and phase shift operations.
  • Step 306 Superimpose the noise reduction signal on the audio to be outputted by the audio output device.
  • FIG. 4 shows a noise reduction method provided by an embodiment of the present invention.
  • the noise reduction method is applied to a mobile terminal having an audio output device for outputting audio. It is obvious that the steps similar to those of FIG. 3 are not described in detail in the embodiments of the present invention. Referring to Figure 4, the method flow includes:
  • Step 401 Acquire an acceleration signal of the mobile terminal when the audio output device is in an active state.
  • This step 401 is the same as step 301 in the method shown in FIG. 3, and details are not described herein again.
  • Step 402 Adjust the acceleration signal so that the amplitude of the adjusted acceleration signal is within a predetermined amplitude range.
  • This step 402 is the same as step 302 in the method shown in FIG. 3, and details are not described herein again.
  • Step 403 Convert the adjusted acceleration signal from the time domain to the frequency domain to obtain an acceleration frequency domain signal.
  • the acceleration frequency domain signal is expressed as follows.
  • ⁇ 3 ⁇ 4 cos (w. + Pa + cos (w. + ⁇ + A aN i cos( 3 ⁇ 4 N t + ⁇ ⁇ ⁇ ) ( 3 )
  • a the acceleration frequency domain signal
  • t the time from the first sample
  • the duration from the start to the current sample time, the amplitude of the acceleration collected for the nth sample time, 6 ⁇ is the circular frequency of the acceleration a n at the nth sample time
  • ⁇ ⁇ is the nth
  • n Take 0, 1 or Nl, where N is a natural number.
  • denotes the sampling period, (a k , jb k ) is the kth harmonic component of x( k ).
  • DFT denotes discrete Fourier
  • x ( n ) represents the discrete data composed of the accelerations of each set of time samples. k and n - correspond and k takes 0, 1 or Nl.
  • the complex sequence X ( k ) of X ( n ) can be obtained.
  • x ( k ) the amplitude, circular frequency and initial phase angle of the acceleration at each sampling time can be calculated.
  • Each acceleration is equivalent to each harmonic component of the acceleration signal.
  • the acceleration signal can be The number is expressed as the sum of the harmonic components, as in equation (3).
  • Step 404 Integrate the acceleration frequency domain signal twice to obtain a displacement frequency domain signal.
  • the displacement frequency domain signal is expressed as follows.
  • step 402-step 404 the vibration waveform when the mobile terminal vibrates is determined.
  • Step 405 The phase of the determined vibration waveform is moved forward or backward, and the phase-shifted vibration waveform is inverted to obtain the same noise reduction signal as the inverted vibration waveform waveform.
  • This step 405 is the same as step 305 in the method shown in FIG. 3, and details are not described herein again.
  • Step 406 Superimpose the noise reduction signal on the audio to be outputted by the audio output device.
  • This step 406 is the same as step 306 in the method shown in FIG. 3, and details are not described herein again.
  • the acceleration signal of the mobile terminal is obtained; and the vibration waveform when the mobile terminal vibrates is determined according to the acceleration signal; the vibration waveform can be used to measure the vibration waveform of the human skeleton; The determined vibration waveform is reversed, and the same noise reduction signal as that of the reversed vibration waveform is obtained, and the noise reduction signal is superimposed on the audio to be outputted by the audio output device; since the reverse vibration waveform can be used for the human skeleton The vibration waveform is neutralized, thus reducing and eliminating the noise generated by bone vibration, thereby improving the effect of people listening to audio.
  • the processor 201 can be implemented when the audio output device 203 is in operation.
  • the calling sensor 205 collects the acceleration signal of the mobile terminal; obtains the acceleration signal of the mobile terminal; determines the vibration waveform when the mobile terminal vibrates according to the acceleration signal; reverses the calculated vibration waveform, obtains and reverses
  • the subsequent vibration waveform waveform has the same noise reduction signal; the noise reduction signal is superimposed to the audio to be output by the audio output device 203.
  • the processor 201 can implement, calculating a rate signal according to the acceleration signal; and calculating the displacement signal according to the rate signal.
  • the processor 201 can realize moving the phase of the determined vibration waveform forward or backward.
  • the processor 201 can implement adjusting the acceleration signal such that the amplitude of the adjusted acceleration signal is within a predetermined amplitude range.
  • FIG. 5 shows a noise reduction device provided by an embodiment of the present invention.
  • the device may be disposed on a mobile terminal, and the mobile terminal is provided with an audio output device and a sensor for outputting audio.
  • the apparatus includes an acquisition module 501, a determination module 502, a reverse module 503, and a superposition module 504.
  • the obtaining module 501 is configured to obtain an acceleration signal of the mobile terminal when the audio output device is in an active state.
  • the acceleration signal of the mobile terminal is collected by the sensor.
  • the determining module 502 is configured to determine, according to the acceleration signal, a vibration waveform when the mobile terminal vibrates.
  • the inversion module 503 is configured to invert the determined vibration waveform to obtain the same noise reduction signal as the inverted vibration waveform.
  • the overlay module 504 is configured to superimpose the noise reduction signal on the audio to be output by the audio output device.
  • FIG. 6 shows a noise reduction device provided by an embodiment of the present invention.
  • the device is disposed on a mobile terminal, and the mobile terminal is provided with an audio output device and a sensor for outputting audio.
  • the apparatus includes an acquisition module 601, a determination module 602, a reverse module 603, and an overlay module 604.
  • the obtaining module 601 is configured to obtain an acceleration signal of the mobile terminal when the audio output device is in an active state.
  • the acceleration signal of the mobile terminal is collected by the sensor.
  • the determining module 602 is configured to determine, according to the acceleration signal, a vibration waveform when the mobile terminal vibrates.
  • the reverse module 603 is configured to invert the determined vibration waveform to obtain the same noise reduction signal as the inverted vibration waveform.
  • the determining module 602 includes a first calculating unit 6021 and a second calculating unit 6022.
  • the first calculating unit 6021 is configured to calculate a rate signal according to the acceleration signal.
  • the first calculating unit 6021 can calculate the rate signal according to the formula (4).
  • the second calculating unit 6022 is configured to calculate the displacement signal according to the rate signal. Second computing unit
  • 6022 can be calculated according to formula (5)
  • the velocity signal is the displacement signal
  • A is the acceleration value of the i-th sample time
  • i takes 1, 2 or N
  • N is a natural number.
  • the determining module 602 is configured to convert the acceleration signal from the time domain to the frequency domain to obtain an acceleration frequency domain signal; and integrate the acceleration frequency domain signal twice to obtain a bit shift frequency domain signal.
  • t represents the duration from the first sample time to the current sample time
  • the amplitude of the acceleration a n collected for the nth sample time is the nth sample time ⁇
  • the circular frequency of the set acceleration a n ⁇ ⁇ is the initial phase angle of the acceleration a n collected at the nth sample time
  • n is 0, 1 or N-1
  • N is a natural number.
  • T represents the sampling period
  • (a k , jb k ) is the kth harmonic component in x(k)
  • DFT denotes a discrete Fourier transform operation
  • x ( n ) denotes discrete data composed of accelerations at each sample time
  • k and n - corresponds and k takes 0, 1 or Nl.
  • the determining module 602 is configured to adjust the acceleration signal And the amplitude of the adjusted acceleration signal is within a predetermined amplitude range; and the vibration waveform when the mobile terminal vibrates is determined according to the adjusted acceleration signal.
  • the inverting module 603 is further configured to advance or backward the phase of the determined vibration waveform.
  • the overlay module 604 is configured to superimpose the noise reduction signal to the audio to be output by the audio output device.
  • the acceleration signal of the mobile terminal is obtained; and the vibration waveform when the mobile terminal vibrates is determined according to the acceleration signal; the vibration waveform can be used to measure the vibration waveform of the human skeleton; The determined vibration waveform is reversed, and the same noise reduction signal as that of the reversed vibration waveform is obtained, and the noise reduction signal is superimposed on the audio to be outputted by the audio output device; since the reverse vibration waveform can be used for the human skeleton The vibration waveform is neutralized, thus reducing and eliminating the noise generated by bone vibration, thereby improving the effect of people listening to audio.
  • Way two is neutralized, thus reducing and eliminating the noise generated by bone vibration, thereby improving the effect of people listening to audio.
  • FIG. 7 shows a mobile terminal according to an embodiment of the present invention, which is applicable to the noise reduction method shown in FIG. 1, FIG. 3 and FIG.
  • the mobile terminal includes an audio output device 701 for outputting audio and a sensor 702 for collecting acceleration signals of the mobile terminal.
  • the mobile terminal further includes a noise reduction signal determining circuit 703 and a coupling circuit 704.
  • the noise reduction signal determining circuit 703 is configured to obtain an acceleration signal of the mobile terminal when the audio output device 701 is in an active state, and determine a vibration waveform when the mobile terminal vibrates according to the acceleration signal, and then reverse the determined vibration waveform. , the same noise reduction signal as the inverted waveform waveform is obtained.
  • the noise reduction signal determining circuit 703 includes: a resistor R1, a resistor R2, a resistor R3, a resistor R4, a capacitor C1, a capacitor C2, a capacitor C3, an operational amplifier Ul, and an operation.
  • the first end of the resistor R1 inputs an acceleration signal, and the second end of the resistor R1 is electrically connected to the non-inverting input terminal of the operational amplifier U1 and the first end of the capacitor C1, respectively, and the second end of the capacitor C1 is grounded.
  • the first end of the resistor R2 is grounded, and the second end of the resistor R2 is electrically connected to the inverting input terminal of the operational amplifier U1 and the first end of the capacitor C2, respectively, and the output end of the operational amplifier U1 and the first end of the resistor R3 and the capacitor respectively The second end of C2 is electrically connected.
  • the second end of the resistor R3 is electrically connected to the inverting input terminal of the operational amplifier U2 and the first end of the capacitor C3, the first end of the resistor R4 is grounded, and the second end of the resistor R4 is in phase with the operational amplifier U2.
  • the input is electrically connected; the output of the operational amplifier U2 is connected to the second end of the capacitor C3.
  • the operation of a falling noise signal determining circuit 703 will be briefly described.
  • the resistor R1, the resistor R2, the capacitor C1, the capacitor C2, and the operational amplifier U1 constitute a non-integral integrating circuit.
  • the in-phase integration circuit mainly has the function of in-phase integration.
  • the resistance values of H and R1 and R2 are both R.
  • the capacitance values of capacitor C1 and capacitor C2 are both.
  • the input signal of the first end of resistor R1 is 1 ⁇ , and the output signal of the in-phase integrating circuit is U 0 . Then the output signal U 0 is as shown in the formula (6).
  • the in-phase integration circuit also has the effect of amplifying and reducing the output signal.
  • the resistor R3, the resistor R4, the capacitor C3 and the operational amplifier U2 constitute a reverse integration circuit.
  • the reverse integration circuit mainly performs the second integration and the reverse of the waveform.
  • the input signal of the first end of the resistor R3 is U 0 . It is assumed that the resistance values of the resistor R3 and the resistor R4 are both R', the capacitance value of the capacitor C3 is C, and the output signal of the reverse integration circuit is IV. Then the output signal IV is as shown in equation (7).
  • the mobile terminal further includes a phase shifting circuit for shifting the phase of the determined vibration waveform forward or backward, and the phase shifting circuit includes a resistor R5 and a capacitor C4.
  • the output of operational amplifier U1 is electrically coupled to the first terminal of resistor R3 via resistor R5.
  • the first end of the resistor R5 is electrically connected to the output end of the operational amplifier U1 and the second end of the capacitor C2 respectively; the second end of the resistor R5 is electrically connected to the first end of the resistor R3, the first end of the capacitor C4 is grounded, and the capacitor C4 The second end is connected between the resistor R5 and the resistor R3.
  • the effective value f / 2 of the response voltage t / 2 is as shown in the formula (9).
  • ⁇ 2 Z-arctan «RC.
  • the coupling circuit 704 is configured to superimpose the noise reduction signal to the audio to be output by the audio output device.
  • the coupling circuit 704 includes a capacitor C5.
  • the first end of the capacitor C5 is electrically connected to the output end of the operational amplifier U2 and the second end of the capacitor C3, respectively.
  • the second end is connected to the audio output device 701.
  • the acceleration signal of the mobile terminal is obtained; and the vibration waveform when the mobile terminal vibrates is determined according to the acceleration signal; the vibration waveform can be used to measure the vibration waveform of the human skeleton; The determined vibration waveform is reversed, and the same noise reduction signal as that of the reversed vibration waveform is obtained, and the noise reduction signal is superimposed on the audio to be outputted by the audio output device; since the reverse vibration waveform can be used for the human skeleton The vibration waveform is neutralized, thus reducing and eliminating the noise generated by bone vibration, thereby improving the effect of people listening to audio.
  • noise reduction device in the noise reduction device provided by the foregoing embodiment, only the division of each functional module described above is used for example in the case of noise reduction. In actual applications, the function distribution may be completed by different functional modules as needed. The internal structure of the device is divided into different functional modules to perform all or part of the functions described above.
  • the noise reduction device and the noise reduction method embodiment provided by the foregoing embodiments are in the same concept, and the specific implementation process is described in detail in the method embodiment, and details are not described herein again.

Abstract

本发明实施例提供了一种降噪方法、装置及移动终端,涉及移动终端领域,方法包括:当音频输出设备处于工作状态时,获得该移动终端的加速度信号;根据加速度信号,确定移动终端发生振动时的振动波形;将确定出的振动波形反向,得到与反向后振动波形波形相同的降噪信号,并将降噪信号叠加至音频输出设备待输出的音频。装置包括获取模块、确定模块、方向模块和叠加模块。移动终端包括处理器、存储器、音频输出设备和传感器。该移动终端包括音频输出设备、传感器、降噪信号确定电路和耦合电路。本发明通过确定振动波形,该振动波形可以将人体骨骼的振动波形中和,因此降低以及消除了骨骼振动产生的噪声,从而改善人们在听音频时的效果。

Description

说 明 书 一种降噪方法、 装置及移动终端 技术领域
本发明涉及移动终端领域, 特别涉及一种降噪方法、 装置及移动终端。 背景技术
听觉是声音经过外耳廓收集到外耳道,引起鼓膜振动,随之带动锤骨运动, 传向砧骨、 镫骨, 然后传给听觉神经产生的。 声音包括人们希望听到的声音、 以及不希望听到的声音, 即噪声。噪声形成的听觉往往给人们造成困扰。例如, 当人们在聆听移动终端等机器输出的音频时, 噪声的进入会影响人们听音频的 效果, 使人们感到烦躁, 甚至影响人们的健康。
目前的降噪方法仅考虑了环境空间中传递的噪声, 没有考虑其他方式传递 的噪声, 因此, 目前的降噪方法的效果有一定的局限性, 效果还不够理想。 发明内容
为了提高降噪效果, 本发明提供了一种降噪方法、 装置及移动终端。 所述 技术方案如下:
第一方面, 本发明提供了一种移动终端, 包括处理器、 用于输出音频的音 频输出设备和用于釆集所述移动终端的加速度信号的传感器, 所述移动终端还 包括降噪信号确定电路和耦合电路,
所述降噪信号确定电路用于, 当所述音频输出设备处于工作状态时, 获得 所述移动终端的加速度信号, 并根据所述加速度信号, 确定所述移动终端发生 振动时的振动波形, 再将确定出的所述振动波形反向, 得到与反向后的所述振 动波形波形相同的降噪信号; 其中, 所述加速度信号是所述传感器釆集的; 所述輛合电路用于, 将所述降噪信号叠加至所述音频输出设备待输出的音 频。
结合第一方面, 在第一方面的第一实施方式中, 所述降噪信号确定电路包 括:
电阻 Rl、 电阻 R2、 电阻 R3、 电阻 R4, 电容 Cl、 电容 C2、 电容 C3、 运 算放大器 Ul、 以及运算放大器 U2;
所述电阻 R1的第一端输入所述加速度信号, 所述电阻 R1的第二端分别 与所述运算放大器 U1的同相输入端和所述电容 C1的第一端电连接, 所述电 容 C1的第二端接地;
所述电阻 R2的第一端接地, 所述电阻 R2的第二端分别与所述运算放大 器 U1的反相输入端和所述电容 C2的第一端电连接,所述运算放大器 U1的输 出端分别与所述电阻 R3的第一端和所述电容 C2的第二端电连接;
所述电阻 R3的第二端分别与所述运算放大器 U2的反相输入端和所述电 容 C3的第一端电连接, 所述电阻 R4的第一端接地, 所述电阻 R4的第二端与 所述运算放大器 U2的同相输入端电连接; 所述运算放大器 U2的输出端与所 述电容 C3的第二端连接。
结合第一方面和第一方面的第一实施方式, 在第一方面的第二实施方式 相电路,
所述移相电路包括电阻 R5和电容 C4;
所述运算放大器 U1的输出端通过所述电阻 R5与所述电阻 R3的第一端电 连接;
所述电阻 R5的第一端分别与所述运算放大器 U1的输出端和所述电容 C2 的第二端电连接; 所述电阻 R5的第二端与所述电阻 R3的第一端电连接, 所 述电容 C4的第一端接地, 所述电容 C4的第二端连在所述电阻 R5和所述电阻 R3之间。
结合第一方面、 第一方面的第一实施方式和第一方面的第二实施方式, 在 第一方面的第三实施方式中, 所述輛合电路包括电容 C5,
所述电容 C5的第一端分别与所述运算放大器 U2的输出端和所述电容 C3 的第二端电连接; 所述电容 C5的第二端与所述音频输出设备连接。 第二方面, 本发明提供了一种降噪装置, 适用于移动终端, 所述移动终端 上设有用于输出音频的音频输出设备和传感器, 所述装置包括:
获取模块, 用于当所述音频输出设备处于工作状态时, 获得所述移动终端 的加速度信号, 其中, 所述移动终端的加速度信号是由所述传感器釆集的; 确定模块, 用于根据所述加速度信号, 确定所述移动终端发生振动时的振 动波形;
反向模块, 用于将确定出的所述振动波形反向, 得到与反向后的所述振动 波形波形相同的降噪信号;
叠加模块, 用于将所述降噪信号叠加至所述音频输出设备待输出的音频。 结合第二方面, 在第二方面的第一实施方式中, 所述确定模块包括: 第一计算单元, 用于根据所述加速度信号, 计算速率信号;
第二计算单元, 用于根据所述速率信号, 计算位移信号, 得到所述移动终 端发生振动时的振动波形。
结合第二方面, 在第二方面的第二实施方式中, 所述反向模块还用于, 将确定出的所述振动波形的相位前移或后移。
结合第二方面、 第二方面的第一实施方式和第二实施方式, 在第二方面的 第三实施方式中, 所述确定模块用于,
对所述加速度信号进行调节,使调节后的加速度信号的幅度在预定幅度范 围;
根据调节后的加速度信号, 确定所述移动终端发生振动时的振动波形。 第三方面, 本发明提供了一种降噪方法, 适用于移动终端, 所述移动终端 上设有用于输出音频的音频输出设备, 所述方法包括:
当所述音频输出设备处于工作状态时, 釆集所述移动终端的加速度信号; 根据所述加速度信号, 确定所述移动终端发生振动时的振动波形; 将确定出的所述振动波形反向,得到与反向后的所述振动波形波形相同的 降噪信号;
将所述降噪信号叠加至所述音频输出设备待输出的音频。
结合第三方面,在第三方面的第一实施方式中,所述根据所述加速度信号, 确定所述移动终端发生振动时的振动波形, 包括:
根据所述加速度信号, 计算速率信号;
根据所述速率信号, 计算位移信号, 得到所述移动终端发生振动时的振动 波形。
结合第三方面, 在第三方面的第二实施方式中, 在所述将确定出的所述振 动波形反向之前, 所述方法还包括:
将确定出的所述振动波形的相位前移或后移。 结合第三方面、 第三方面的第一实施方式和第二实施方式, 在第三方面的 第三实施方式中, 在所述根据所述加速度信号, 确定所述移动终端发生振动时 的振动波形之前, 所述方法还包括:
对所述加速度信号进行调节,使调节后的加速度信号的幅度在预定幅度范 围。 本发明实施例提供的技术方案的有益效果是: 当音频输出设备处于工作状 态时, 通过获得该移动终端的加速度信号; 根据加速度信号, 确定移动终端发 生振动时的振动波形; 该振动波形可以用于衡量人体骨骼的振动波形; 将确定 出的振动波形反向, 得到与反向后的振动波形波形相同的降噪信号, 并将降噪 信号叠加至音频输出设备待输出的音频; 由于反向后的振动波形可以将人体骨 骼的振动波形中和, 因此降低以及消除了骨骼振动产生的噪声, 从而改善人们 在听音频时的效果。 附图说明
为了更清楚地说明本发明实施例中的技术方案, 下面将对实施例描述中所 需要使用的附图作简单地介绍, 显而易见地, 下面描述中的附图仅仅是本发明 的一些实施例,对于本领域普通技术人员来讲,在不付出创造性劳动的前提下, 还可以根据这些附图获得其他的附图。
图 1是本发明实施例提供的一种降噪方法的流程图;
图 2是本发明实施例提供的一种移动终端的结构示意图;
图 3和图 4是本发明实施例提供的又一种降噪方法的流程图;
图 5是本发明实施例提供的一种降噪装置的结构示意图;
图 6是本发明实施例提供的又一种降噪装置的结构示意图;
图 7是本发明实施例提供的又一种移动终端的结构示意图;
图 8是本发明实施例提供的降噪信号确定电路和耦合电路的结构示意图; 图 9是本发明实施例提供的移相电路的原理示意图。 具体实施方式
为使本发明的目的、 技术方案和优点更加清楚, 下面将结合附图对本发明 实施方式作进一步地详细描述。 为了便于理解本发明实施例提供的技术方案, 首先对除环境空间之外的空 间传递的噪声进行介绍。 当人处于汽车或火车等震动环境中时, 人体骨骼会随 之发生振动。骨骼的振动会直接传递到砧骨、镫骨,并传给听觉神经形成听觉。 这种听觉相对于移动终端输出的音频产生的听觉是不和谐的, 属于人们不希望 听到的噪声。 由于 MIC无法釆集到骨骼振动产生的噪声, 因此, 现有的降噪 方式无法降低和消除骨骼振动产生的噪声, 降噪效果不够理想。
此外, 在本发明实施例中, 移动终端包括智能手机、 笔记本电脑和平板电 脑。 音频输出设备包括移动终端上设置的喇八、 听筒、 以及耳塞。 图 1示出了本发明实施例提供的一种降噪方法。 该降噪方法适用于移动终 端, 该移动终端上设有用于输出音频的音频输出设备。 参见图 1, 该方法流程 包括:
步骤 101 : 当音频输出设备处于工作状态时, 获得该移动终端的加速度信 号。
步骤 102: 根据加速度信号, 确定移动终端发生振动时的振动波形。
步骤 103: 将确定出的振动波形反向, 得到与反向后的振动波形波形相同 的降噪信号。
步骤 104: 将该降噪信号叠加至音频输出设备待输出的音频。
本发明实施例当音频输出设备处于工作状态时, 通过获得该移动终端的加 速度信号; 根据加速度信号, 确定移动终端发生振动时的振动波形; 该振动波 形可以用于衡量人体骨骼的振动波形; 将确定出的振动波形反向, 得到与反向 后的振动波形波形相同的降噪信号, 并将降噪信号叠加至音频输出设备待输出 的音频; 由于反向后的振动波形可以将人体骨骼的振动波形中和, 因此降低以 及消除了骨骼振动产生的噪声, 从而改善人们在听音频时的效果。 实现本发明实施例的降噪方法, 有至少两种硬件设计方式, 下面分别进行 介绍。 本领域技术人员可以理解, 这并不构成对其的限定。
方式一
A
图 2示出了本发明实施例提供的一种移动终端, 参见图 2, 该移动终端包 括至少一个处理器 201 (例如 CPU )、 存储器 202、 音频输出设备 203、 至少一 个通信总线 204和至少一个传感器 205。 本领域技术人员可以理解, 图 2中示 少的部件, 或者组合某些部件, 或者不同的部件布置。
处理器 201、 存储器 202、 音频输出设备 203、 传感器 205以及通信总线
204。
通信总线 204用于实现处理器 201、 存储器 202、 音频输出设备 203和传 感器 205之间的连接通信。
传感器 205用于检测移动终端的运动状态, 比如釆集移动终端的加速度。 传感器 205包括加速度传感器。
存储器 202可用于存储软件程序以及应用模块, 处理器 201通过运行存储 在存储器 202的软件程序以及应用模块,从而执行移动终端的各种功能应用以 及数据处理。 存储器 202可主要包括存储程序区和存储数据区, 其中, 存储程 序区可存储操作系统、至少一个功能(例如确定振动波形)所需的应用程序等; 存储数据区可存储根据移动终端的使用所创建的数据 (例如存储加速度信号 ) 等。 此外, 存储器 202可以包括高速 RAM ( Random Access Memory, 随机存 取存储器), 还可以包括非易失性存储器 (non-volatile memory ), 例如至少一 个磁盘存储器件、 闪存器件、 或其他易失性固态存储器件。
处理器 201是移动终端的控制中心, 利用各种接口和线路连接整个移动终 端的各个部分, 通过运行或执行存储在存储器 202 内的软件程序和 /或应用模 块, 以及调用存储在存储器 202内的数据, 执行移动终端的各种功能和处理数 据, 从而对移动终端进行整体监控。 下面在图 1所示的方法基础上, 详细介绍在上述移动终端上实现降噪。 图 3示出了本发明实施例提供的一种降噪方法。 该降噪方法适用于移动终 端, 该移动终端上设有用于输出音频的音频输出设备。 参见图 3, 该方法流程 包括:
步骤 301 : 当音频输出设备处于工作状态时, 获得该移动终端的加速度信 号。
作为本实施例的可选方式, 可以釆用加速度传感器釆集该移动终端的加速 度, 得到加速度信号。移动终端在外力作用下, 将发生运动,从而产生加速度。 例如, 当移动终端处于汽车或火车等震动环境中时, 平放的移动终端将发生振 动, 产生加速度。 而当直线移动移动终端时, 也能产生加速度。 由于加速度传 感器是三轴的, 在平放时, 移动终端振动产生的加速度会反映在加速度传感器 的 Z轴方向, 因此, 可以按照以下方式得到振动时产生的加速度, 识别加速度 传感器在 Z轴方向感应的加速度, 忽略在 X和 Y轴方向感应的加速度。 显然, 假若移动终端未受外力, 移动终端将相对静止, 其加速度将为 0。
加速度信号可以按照一定的频率进行釆样, 因为震动环境的噪声频率一般 小于 lkHz, 所以加速度信号的釆样频率一般要大于 2kHz。
加速度传感器, 又称加速度计, 包括电容式加速度传感器。 电容式加速度 传感器是基于电容原理的极距变化型的电容传感器。 由于电容式加速度传感器 的制造工艺属于微机电系统( Micro-Electro-Mechanical System, 简称 MEMS ) 工艺, 因此, 电容式加速度传感器能够大量生产, 从而保证了较低的成本, 使 得电容式加速度传感器能够被普遍应用在移动终端上。
在实际应用中, 移动终端在调用音频输出设备输出音频时, 可以同时调用 加速度传感器釆集该移动终端的加速度。 比如, 当检测到智能手机上运行了通 话功能(通话功能的实现将调用听筒, 以播放与用户通话的对端用户的声音) 时, 立即调用加速度传感器釆集移动终端的加速度。
其中, 得到的加速度信号可以是模拟信号, 也可以是数字信号。
步骤 302: 对加速度信号进行调节, 使调节后的加速度信号的幅度在预定 幅度范围。
其中, 当加速度信号的幅度小于预定幅度范围时, 放大加速度信号; 当加 速度信号的幅度大于预定幅度范围时, 缩小加速度信号。 该预定幅度范围可以 是用户通过移动终端设置, 也可以在移动终端出厂前设置在移动终端中。
通过将加速度信号的幅度调节至预定幅度范围, 可以实现对骨骼振动产生 的噪声的抑制强度进行调节。 当加速度信号的放大倍数越大, 则对骨骼振动产 生的噪声的抑制越强, 当加速度信号的放大倍数越小甚至是缩小的情况, 则对 骨骼振动产生的噪声的抑制越弱。
可以釆用放大电路对加速度信号进行调节。 需要说明的是, 放大电路适用 于模拟信号的幅度的放大和缩小。 若需调节的加速度信号为数字信号, 则在釆 用放大电路对加速度信号进行调节之前, 可以釆用数 /模转换器 (DAC )将加 速度数字信号转换为模拟信号。
步骤 303: 根据调节后的加速度信号, 计算速率信号。 可以按照公式(1 )计算速率信号。
v(t) = [a(t)dt = f[ai + ai l ]At
" ^ 2 ( 1 )
步骤 304: 根据速率信号, 计算位移信号, 得到移动终端发生振动时的振 动波形。
其中, 由于振动波形是位移随时间变化(即位移信号)的图形表示。 因此, 计算出位移信号, 就是计算出振动波形。 可以按照公式(2 )计算位移信号。
Figure imgf000010_0001
( 2 )
其中, 为加速度信号, 为速率信号, 为位移信号, A为第 i个釆 样时刻的加速度值, v '为第 i个釆样时刻的速率值, "。=0; v。=0, 为相邻两 次釆样时刻之间的时间差, i取 1、 2 或N, N为自然数。
通过步骤 302-步骤 304实现了, 根据加速度信号, 确定移动终端发生振动 时的振动波形。 可以釆用处理器确定振动波形 (参见图 2、 图 5或图 6示出的 实施例), 也可以釆用预置电路确定振动波形 (参见图 7示出的电路)。 在釆用 处理器器确定振动波形时, 输入处理器器的加速度信号为数字信号, 在釆用预 置电路确定振动波形时, 输入预置电路的加速度信号为模拟信号。
步骤 305: 将确定出的振动波形的相位前移或后移, 并将移相后的振动波 形反向, 得到与反向后的振动波形波形相同的降噪信号。
其中, 由于震动环境中的震动通过骨骼传到耳朵的时间与振动波形输出至 人耳的时间可能存在一定的偏差, 从波形上看就会有相位差。 如果相位差过大 则会严重影响降噪效果。 因此, 可以将计算出的振动波形的相位前移或后移, 其中, 可以预先设置前移或后移的相位值。 工作人员可以通过多次前移或后移 相位的试验, 并将试验效果与未移动相位的效果进行比较, 确定是否前移或后 移相位, 并确定出前移或后移的相位值。
值得注意的是, 在本步骤 305中, 也可以先进行反向的操作, 再进行移相 的操作, 本实施例不对反向与移相操作的先后顺序进行限定。
步骤 306: 将该降噪信号叠加至音频输出设备待输出的音频。
本发明实施例当音频输出设备处于工作状态时, 通过获得该移动终端的加 速度信号; 根据加速度信号, 确定移动终端发生振动时的振动波形; 该振动波 形可以用于衡量人体骨骼的振动波形; 将确定出的振动波形反向, 得到与反向 后的振动波形波形相同的降噪信号, 并将降噪信号叠加至音频输出设备待输出 的音频; 由于反向后的振动波形可以将人体骨骼的振动波形中和, 因此降低以 及消除了骨骼振动产生的噪声, 从而改善人们在听音频时的效果。 图 4示出了本发明实施例提供的一种降噪方法。 该降噪方法适用于移动终 端, 该移动终端上设有用于输出音频的音频输出设备。 很显然, 与附图 3相似 的步骤, 本发明实施例不再赘述。 参见图 4, 该方法流程包括:
步骤 401 : 当音频输出设备处于工作状态时, 获得该移动终端的加速度信 号。
本步骤 401同图 3示出的方法中步骤 301, 在此不再赘述。
步骤 402: 对加速度信号进行调节, 使调节后的加速度信号的幅度在预定 幅度范围。
本步骤 402同图 3示出的方法中步骤 302, 在此不再赘述。
步骤 403: 将调节后的加速度信号从时域转换为频域, 得到加速度频域信 号。
加速度频域信号表示如下。
α = Λ¾ cos(w。 + Pa + cos(w。 +〜 + AaN i cos(¾ N t + φαΝ ΐ ) ( 3 ) 其中, a为加速度频域信号, t表示从首个釆样时刻开始到当前釆样时刻的 时长, 为第 n个釆样时刻釆集的加速度 。的幅值, 6 ^为第 n个釆样时刻釆 集的加速度 an的圓频率, φα为第 η个釆样时刻釆集的加速度 an的初相角。 n 取 0、 1 或 N-l, N为自然数。
其中, = 2 + ¾2ωαη = ^ Ψα = arctan-^ ,
Τ表示釆样周期,(ak,jbk)为 x( k )中第 k个谐波分量。 x( k )=DFT[x(n)]=[(ao, jb0), (al 5 jb , ..., (aN-1, jbN-1)]。 DFT表示离散傅里叶变换运算, x ( n )表示 每个釆样时刻釆集的加速度构成的离散数据。 k与 n——对应且 k取 0、 1 或 N-l。
其中, 经过离散傅里叶变换运算, 可以得到 X ( n )的复数序列 X ( k )。 根 据 x ( k ), 可以计算出每个釆样时刻的加速度的幅值、 圓频率及初相角。 每个 加速度相当于加速度信号的各谐波分量, 根据信号叠加原理, 可以将加速度信 号表示为各谐波分量的和, 如公式(3 )。
步骤 404: 对加速度频域信号进行两次积分, 得到位移频域信号。
位移频域信号表示如下。
d = 。 cos(i¾。t + <¾。) + Adi cos(¾ + +〜 + AdN― cos(¾w i ϊ + ) 其中, d表示位移频域信号, = ^, Ψάί = φαί - π , = 。 其中, 对加速度频域信号进行一次积分, 可得到速率频域信号, 再对速率 频域信号进行一次积分, 得到位移频域信号。
通过步骤 402-步骤 404实现了, 根据加速度信号, 确定移动终端发生振动 时的振动波形。
步骤 405: 将确定出的振动波形的相位前移或后移, 并将移相后的振动波 形反向, 得到与反向后的振动波形波形相同的降噪信号。
本步骤 405同图 3示出的方法中步骤 305, 在此不再赘述。
步骤 406: 将该降噪信号叠加至音频输出设备待输出的音频。
本步骤 406同图 3示出的方法中步骤 306, 在此不再赘述。
本发明实施例当音频输出设备处于工作状态时, 通过获得该移动终端的加 速度信号; 根据加速度信号, 确定移动终端发生振动时的振动波形; 该振动波 形可以用于衡量人体骨骼的振动波形; 将确定出的振动波形反向, 得到与反向 后的振动波形波形相同的降噪信号, 并将降噪信号叠加至音频输出设备待输出 的音频; 由于反向后的振动波形可以将人体骨骼的振动波形中和, 因此降低以 及消除了骨骼振动产生的噪声, 从而改善人们在听音频时的效果。
具体地, 本发明实施例中, 通过运行或执行存储在存储器 202内的软件程 序和 /或应用模块,以及调用存储在存储器 202内的数据,处理器 201可以实现, 当音频输出设备 203处于工作状态时, 调用传感器 205釆集该移动终端的加速 度信号; 获得该移动终端的加速度信号; 根据加速度信号, 确定移动终端发生 振动时的振动波形; 将计算出的振动波形反向, 得到与反向后的振动波形波形 相同的降噪信号; 将降噪信号叠加至音频输出设备 203待输出的音频。
在本实施例的第一实施方式中, 处理器 201可以实现, 根据加速度信号, 计算速率信号; 根据速率信号, 计算位移信号。
在本实施例的第二实施方式中, 处理器 201可以实现, 将确定出的振动波 形的相位前移或后移。 在本实施例的第三实施方式中, 处理器 201可以实现, 对加速度信号进行 调节, 使调节后的加速度信号的幅度在预定幅度范围。
B
图 5示出了本发明实施例提供的一种降噪装置, 该装置可以设置在移动终 端上, 该移动终端上设有用于输出音频的音频输出设备和传感器。 参见图 5, 该装置包括获取模块 501、 确定模块 502、 反向模块 503和叠加模块 504。
获取模块 501用于, 当音频输出设备处于工作状态时, 获得该移动终端的 加速度信号。 其中, 该移动终端的加速度信号是由传感器釆集的。
确定模块 502用于, 根据加速度信号, 确定移动终端发生振动时的振动波 形。
反向模块 503用于, 将确定出的振动波形反向, 得到与反向后的振动波形 波形相同的降噪信号。
叠加模块 504用于, 将降噪信号叠加至音频输出设备待输出的音频。
本发明实施例当音频输出设备处于工作状态时, 通过获得该移动终端的加 速度信号; 根据加速度信号, 确定移动终端发生振动时的振动波形; 该振动波 形可以用于衡量人体骨骼的振动波形; 将确定出的振动波形反向, 得到与反向 后的振动波形波形相同的降噪信号, 并将降噪信号叠加至音频输出设备待输出 的音频; 由于反向后的振动波形可以将人体骨骼的振动波形中和, 因此降低以 及消除了骨骼振动产生的噪声, 从而改善人们在听音频时的效果。 图 6示出了本发明实施例提供的一种降噪装置,该装置设置在移动终端上, 该移动终端上设有用于输出音频的音频输出设备和传感器。 参见图 6, 该装置 包括获取模块 601、 确定模块 602、 反向模块 603和叠加模块 604。
获取模块 601用于, 当音频输出设备处于工作状态时, 获得该移动终端的 加速度信号。 其中, 该移动终端的加速度信号是由传感器釆集的。
确定模块 602用于, 根据加速度信号, 确定移动终端发生振动时的振动波 形。
反向模块 603, 用于将确定出的振动波形反向, 得到与反向后的振动波形 波形相同的降噪信号。
在本实施例的第一实施方式中, 确定模块 602包括第一计算单元 6021和 第二计算单元 6022。 第一计算单元 6021用于, 根据加速度信号, 计算速率信号。 第一计算单 元 6021可以按照公式( 4 )计算速率信号。
Figure imgf000014_0001
第二计算单元 6022用于, 根据速率信号, 计算位移信号。 第二计算单元
6022可以按照公式(5)计
Figure imgf000014_0002
其中, 为加速度信号, 为速率信号, 为位移信号, A为第 i个釆 样时刻的加速度值, v '为第 i个釆样时刻的速率值, "。=0; v。=0, At为相邻两 次釆样时刻之间的时间差, i取 1、 2 或N, N为自然数。
在本实施例的第二实施方式中, 确定模块 602用于, 将加速度信号从时域 转换为频域, 得到加速度频域信号; 对加速度频域信号进行两次积分, 得到位 移频域信号。
其 中 , 加 速 度 频 域 信 号 为 , a = An cos(o„ t + n ) + An cos(<¾„ t + φη ) + ... + An cos(o„ t + n ) , a为力口速度频域信 号, t表示从首个釆样时刻开始到当前釆样时刻的时长, 为第 n个釆样时刻 釆集的加速度 an的幅值, 为第 n个釆样时刻釆集的加速度 an的圓频率, φαη 为第 η个釆样时刻釆集的加速度 an的初相角, n取 0、 1 或 N-1, N为自 然数。
其中, Kn
Figure imgf000014_0003
0。„=2;rn =arctan
k。
T表示釆样周期,(ak,jbk)为 x(k)中第 k个谐波分量, x(k)=DFT[x(n)]=[(ao, jb0), (a" jbi), ..., (aN-1, jbN-1)], DFT表示离散傅里叶变换运算, x ( n )表示 每个釆样时刻釆集的加速度构成的离散数据, k与 n——对应且 k取 0、 1 或 N-l。
其 中 , 位 移 频 域 信 号 为 , d = do cos(¾ot + ¾o) + Adi (^ ^ + ^^…+ ^^ , cos(i¾w it + <¾w ,), d表示位移频域信 号。
=^Τ' = (Pak - , = 。 在本实施例的第三实施方式中, 确定模块 602用于, 对加速度信号进行调 节,使调节后的加速度信号的幅度在预定幅度范围;根据调节后的加速度信号, 确定移动终端发生振动时的振动波形。
在本实施例的第四实施方式中, 反相模块 603还用于, 将确定出的振动波 形的相位前移或后移。
叠加模块 604用于, 将降噪信号叠加至音频输出设备待输出的音频。
本发明实施例当音频输出设备处于工作状态时, 通过获得该移动终端的加 速度信号; 根据加速度信号, 确定移动终端发生振动时的振动波形; 该振动波 形可以用于衡量人体骨骼的振动波形; 将确定出的振动波形反向, 得到与反向 后的振动波形波形相同的降噪信号, 并将降噪信号叠加至音频输出设备待输出 的音频; 由于反向后的振动波形可以将人体骨骼的振动波形中和, 因此降低以 及消除了骨骼振动产生的噪声, 从而改善人们在听音频时的效果。 方式二
图 7示出了本发明实施例提供的一种移动终端, 适用于图 1, 图 3和图 4 示出的降噪方法。参见图 7,该移动终端包括用于输出音频的音频输出设备 701 和用于釆集移动终端的加速度信号的传感器 702。 该移动终端还包括降噪信号 确定电路 703和耦合电路 704。
降噪信号确定电路 703用于, 当音频输出设备 701处于工作状态时, 获得 移动终端的加速度信号, 并根据加速度信号, 确定移动终端发生振动时的振动 波形, 再将确定出的振动波形反向, 得到与反向后的振动波形波形相同的降噪 信号。
在本实施例的第一实施方式中, 参见图 8, 降噪信号确定电路 703包括: 电阻 Rl、 电阻 R2、 电阻 R3、 电阻 R4, 电容 Cl、 电容 C2、 电容 C3、 运算放 大器 Ul、 以及运算放大器 U2。
电阻 R1 的第一端输入加速度信号, 电阻 R1的第二端分别与运算放大器 U1的同相输入端和电容 C1的第一端电连接, 电容 C1的第二端接地。
电阻 R2的第一端接地, 电阻 R2的第二端分别与运算放大器 U1的反相输 入端和电容 C2的第一端电连接,运算放大器 U1的输出端分别与电阻 R3的第 一端和电容 C2的第二端电连接。
电阻 R3的第二端分别与运算放大器 U2的反相输入端和电容 C3的第一端 电连接, 电阻 R4的第一端接地, 电阻 R4的第二端与运算放大器 U2的同相输 入端电连接; 运算放大器 U2的输出端与电容 C3的第二端连接。
简单介绍一下降噪信号确定电路 703的工作原理。 电阻 R1、 电阻 R2、 电 容 Cl、 电容 C2和运算放大器 U1构成同相积分电路。 该同相积分电路主要有 同相积分的作用。 H没电阻 R1和电阻 R2的阻值均为 R, 电容 C1和电容 C2 的电容值均为 , 电阻 R1的第一端的输入信号为 1^, 该同相积分电路的输出 信号为 U0。 则输出信号 U0如公式(6 )所示。
dt ( 6 )
0 RC }
从公式(6 ) 可以看出, 该同相积分电路还具有放大和缩小输出信号的作 用。
其中, 电阻 R3、 电阻 R4、 电容 C3和运算放大器 U2构成反向积分电路。 反向积分电路主要有进行第二次积分和进行波形反向的作用。 电阻 R3的第一 端的输入信号为 U0。 假设电阻 R3和电阻 R4的阻值均为 R', 电容 C3的电容 值为 C,,该反向积分电路的输出信号为 IV。则输出信号 IV如公式(7 )所示。
Figure imgf000016_0001
在本实施例的第二实施方式中, 参见图 8, 移动终端还包括用于将确定出 的振动波形的相位前移或后移的移相电路, 移相电路包括电阻 R5和电容 C4。
运算放大器 U1的输出端通过电阻 R5与电阻 R3的第一端电连接。
电阻 R5的第一端分别与运算放大器 U1的输出端和电容 C2的第二端电连 接; 电阻 R5的第二端与电阻 R3的第一端电连接, 电容 C4的第一端接地, 电 容 C4的第二端连在电阻 R5和电阻 R3之间。
电阻 R5和电容 C4构成的移相电路可以简化为图 9示出的电路。 假设该 电路的输入正弦信号电压 ^ = U, 0° V, 电阻 R5的阻值为 Rl 7 电容 C4的电容 值为 d, 则响应电压 t/2如公式( 8 )所示。 ω为输入信号 的角频率, c为电 容 C4的容量。
Figure imgf000016_0002
其中, 响应电压 t/2的有效值 f/2如公式(9 ) 所示。
Figure imgf000016_0003
响应电压 t/2的相位 为: φ2 = Z-arctan«RC。 从( 8 )和( 9 )式可以看出, 响应电压的大小及相位,在输入信号角频率一定时,随电路参数的不同而改变。 若电容 C4的电容值不变, 电阻 R5的电阻值从零至无穷大变化, 则响应电压 的相位从 0。 到 -90。 变化。
耦合电路 704用于, 将降噪信号叠加至音频输出设备待输出的音频。
在本实施例的第三实施方式中, 参见图 8, 该耦合电路 704包括电容 C5, 电容 C5的第一端分别与运算放大器 U2的输出端和电容 C3的第二端电连接; 电容 C5的第二端与音频输出设备 701连接。
通过电容 C5, 可以进行交流信号的耦合。
本发明实施例当音频输出设备处于工作状态时, 通过获得该移动终端的加 速度信号; 根据加速度信号, 确定移动终端发生振动时的振动波形; 该振动波 形可以用于衡量人体骨骼的振动波形; 将确定出的振动波形反向, 得到与反向 后的振动波形波形相同的降噪信号, 并将降噪信号叠加至音频输出设备待输出 的音频; 由于反向后的振动波形可以将人体骨骼的振动波形中和, 因此降低以 及消除了骨骼振动产生的噪声, 从而改善人们在听音频时的效果。
需要说明的是: 上述实施例提供的降噪装置在降噪时, 仅以上述各功能模 块的划分进行举例说明, 实际应用中, 可以根据需要而将上述功能分配由不同 的功能模块完成, 即将设备的内部结构划分成不同的功能模块, 以完成以上描 述的全部或者部分功能。 另外, 上述实施例提供的降噪装置与降噪方法实施例 属于同一构思, 其具体实现过程详见方法实施例, 这里不再赘述。
上述本发明实施例序号仅仅为了描述, 不代表实施例的优劣。
本领域普通技术人员可以理解实现上述实施例的全部或部分步骤可以通 过硬件来完成, 也可以通过程序来指令相关的硬件完成, 所述的程序可以存储 于一种计算机可读存储介质中, 上述提到的存储介质可以是只读存储器, 磁盘 或光盘等。 以上所述仅为本发明的较佳实施例, 并不用以限制本发明, 凡在本发明的 精神和原则之内, 所作的任何修改、 等同替换、 改进等, 均应包含在本发明的 保护范围之内。

Claims

权 利 要 求 书
1、 一种移动终端, 包括处理器、 用于输出音频的音频输出设备和用于釆集 所述移动终端的加速度信号的传感器, 其特征在于, 所述移动终端还包括降噪 信号确定电路和耦合电路,
所述降噪信号确定电路用于, 当所述音频输出设备处于工作状态时, 获得 所述移动终端的加速度信号, 并根据所述加速度信号, 确定所述移动终端发生 振动时的振动波形, 再将确定出的所述振动波形反向, 得到与反向后的所述振 动波形波形相同的降噪信号; 其中, 所述加速度信号是所述传感器釆集的; 所述耦合电路用于, 将所述降噪信号叠加至所述音频输出设备待输出的音 频。
2、 根据权利要求 1所述的移动终端, 其特征在于, 所述降噪信号确定电路 包括:
电阻 Rl、 电阻 R2、 电阻 R3、 电阻 R4, 电容 Cl、 电容 C2、 电容 C3、 运 算放大器 Ul、 以及运算放大器 U2;
所述电阻 R1的第一端输入所述加速度信号, 所述电阻 R1的第二端分别与 所述运算放大器 U1的同相输入端和所述电容 C1的第一端电连接,所述电容 C1 的第二端接地;
所述电阻 R2的第一端接地, 所述电阻 R2的第二端分别与所述运算放大器 U1的反相输入端和所述电容 C2的第一端电连接,所述运算放大器 U1的输出端 分别与所述电阻 R3的第一端和所述电容 C2的第二端电连接;
所述电阻 R3的第二端分别与所述运算放大器 U2的反相输入端和所述电容 C3的第一端电连接, 所述电阻 R4的第一端接地, 所述电阻 R4的第二端与所述 运算放大器 U2的同相输入端电连接; 所述运算放大器 U2的输出端与所述电容 C3的第二端连接。
3、 根据权利要求 2所述的移动终端, 其特征在于, 所述移动终端还包括用 于将确定出的所述振动波形的相位前移或后移的移相电路,
所述移相电路包括电阻 R5和电容 C4;
所述运算放大器 U1的输出端通过所述电阻 R5与所述电阻 R3的第一端电 连接;
所述电阻 R5的第一端分别与所述运算放大器 U1 的输出端和所述电容 C2 的第二端电连接; 所述电阻 R5的第二端与所述电阻 R3的第一端电连接, 所述 电容 C4的第一端接地, 所述电容 C4的第二端连在所述电阻 R5和所述电阻 R3 之间。
4、 根据权利要求 3所述的移动终端, 其特征在于, 所述輛合电路包括电容
C5 ,
所述电容 C5的第一端分别与所述运算放大器 U2的输出端和所述电容 C3 的第二端电连接; 所述电容 C5的第二端与所述音频输出设备连接。
5、 一种降噪装置, 适用于移动终端, 所述移动终端上设有用于输出音频的 音频输出设备和传感器, 其特征在于, 所述装置包括:
获取模块, 用于当所述音频输出设备处于工作状态时, 获得所述移动终端 的加速度信号, 其中, 所述移动终端的加速度信号是由所述传感器釆集的; 确定模块, 用于根据所述加速度信号, 确定所述移动终端发生振动时的振 动波形;
反向模块, 用于将确定出的所述振动波形反向, 得到与反向后的所述振动 波形波形相同的降噪信号;
叠加模块, 用于将所述降噪信号叠加至所述音频输出设备待输出的音频。
6、 根据权利要求 5所述的装置, 其特征在于, 所述确定模块包括: 第一计算单元, 用于根据所述加速度信号, 计算速率信号;
第二计算单元, 用于根据所述速率信号, 计算位移信号, 得到所述移动终 端发生振动时的振动波形。
7、 根据权利要求 5所述的装置, 其特征在于, 所述反向模块还用于, 将确定出的所述振动波形的相位前移或后移。
8、 根据权利要求 6或 7所述的装置, 其特征在于, 所述确定模块用于, 对所述加速度信号进行调节, 使调节后的加速度信号的幅度在预定幅度范 围;
根据调节后的加速度信号, 确定所述移动终端发生振动时的振动波形。
9、 一种移动终端, 包括处理器、 存储器、 音频输出设备和传感器, 其特征 在于,
所述传感器用于釆集所述移动终端的加速度信号;
所述音频输出设备用于输出音频;
所述处理器用于执行如下指令:
在所述音频输出设备处于工作状态时, 获取所述传感器釆集的所述移动终 端的加速度信号;
根据所述加速度信号, 确定所述移动终端发生振动时的振动波形; 将确定出的所述振动波形反向, 得到与反向后的所述振动波形波形相同的 降噪信号;
将所述降噪信号叠加至所述音频输出设备待输出的音频。
10、 根据权利要求 9所述的移动终端, 其特征在于, 所述处理器用于, 根据所述加速度信号, 计算速率信号;
根据所述速率信号, 计算位移信号, 得到所述移动终端发生振动时的振动 波形。
11、 根据权利要求 9所述的移动终端, 其特征在于, 所述处理器还用于, 将确定出的所述振动波形的相位前移或后移。
12、 根据权利要求 10或 11所述的移动终端, 其特征在于, 所述处理器用 于,
对所述加速度信号进行调节, 使调节后的加速度信号的幅度在预定幅度范 围;
根据调节后的加速度信号, 确定所述移动终端发生振动时的振动波形。
13、 一种降噪方法, 适用于移动终端, 所述移动终端上设有用于输出音频 的音频输出设备, 其特征在于, 所述方法包括:
当所述音频输出设备处于工作状态时, 釆集所述移动终端的加速度信号; 根据所述加速度信号, 确定所述移动终端发生振动时的振动波形; 将确定出的所述振动波形反向, 得到与反向后的所述振动波形波形相同的 降噪信号;
将所述降噪信号叠加至所述音频输出设备待输出的音频。
14、根据权利要求 13所述的方法, 其特征在于, 所述根据所述加速度信号, 确定所述移动终端发生振动时的振动波形, 包括:
根据所述加速度信号, 计算速率信号;
根据所述速率信号, 计算位移信号, 得到所述移动终端发生振动时的振动 波形。
15、 根据权利要求 13所述的方法, 其特征在于, 在所述将确定出的所述振 动波形反向之前, 所述方法还包括:
将确定出的所述振动波形的相位前移或后移。
16、 根据权利要求 14或 15所述的方法, 其特征在于, 在所述根据所述加 速度信号, 确定所述移动终端发生振动时的振动波形之前, 所述方法还包括: 对所述加速度信号进行调节, 使调节后的加速度信号的幅度在预定幅度范 围。
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