WO2020206629A1 - 音频播放器、降低声音失真的方法以及降低声音失真模组 - Google Patents

音频播放器、降低声音失真的方法以及降低声音失真模组 Download PDF

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Publication number
WO2020206629A1
WO2020206629A1 PCT/CN2019/082031 CN2019082031W WO2020206629A1 WO 2020206629 A1 WO2020206629 A1 WO 2020206629A1 CN 2019082031 W CN2019082031 W CN 2019082031W WO 2020206629 A1 WO2020206629 A1 WO 2020206629A1
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sound
audio signal
audio
reduction module
unit
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PCT/CN2019/082031
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English (en)
French (fr)
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谢冠宏
Bignardi LUCA
邱士嘉
游博丞
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万魔声学科技有限公司
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Priority to PCT/CN2019/082031 priority Critical patent/WO2020206629A1/zh
Publication of WO2020206629A1 publication Critical patent/WO2020206629A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
    • H04R9/06—Loudspeakers

Definitions

  • the present invention relates to the field of electronic equipment, in particular to an audio player, a method for reducing sound distortion, and a sound distortion reducing module.
  • one of the objectives of the present invention is to disclose an audio player, which is used to solve the problem that the amplitude of the sound and the input signal is not linearly changed, which causes harmonic distortion, resulting in poor sound quality. Good question.
  • the second objective of the present invention discloses a method for reducing sound distortion.
  • the third objective of the present invention is to disclose a sound distortion reduction module.
  • An audio player includes an electromagnetically driven sound generating unit, an audio signal receiver, and a sound distortion reduction module. Both the audio signal receiver and the sound distortion reduction module are electrically connected to the electromagnetic driven sound generating unit; The audio signal receiver is used to receive audio signals and input the audio signals to the electromagnetic drive sound generating unit, and the sound distortion reduction module is used to generate an AC bias signal and input the AC bias signal to the Electromagnetic drive sound unit.
  • the sound distortion reduction module is electrically connected to the audio signal receiver, and the sound distortion reduction module is used to detect whether the audio signal receiver inputs an audio signal, and when an audio signal is detected When the signal is input, the AC bias signal is generated.
  • the audio player further includes a housing with an inner cavity, the housing is provided with a sound hole communicating with the inner cavity, and the electromagnetic drive sound generating unit is arranged in the Inside the housing, the electromagnetically driven sounding unit and the housing are enclosed to form a sound channel communicating with the sound outlet; the electromagnetically driven sounding unit is a single moving coil speaker, and the audio player further includes a sound filter The sound filter is arranged at the sound hole or in the sound channel to filter out the AC bias signal.
  • the audio player further includes a housing with an inner cavity, the housing is provided with a sound hole communicating with the inner cavity, and the electromagnetic drive sound generating unit is arranged in the Inside the housing, the electromagnetically driven sounding unit and the housing are enclosed to form a sound channel communicating with the sound hole; the electromagnetically driven sounding unit is a single-action iron speaker, and the audio player further includes a sound filter The sound filter is arranged at the sound hole or in the sound channel to filter out the AC bias signal.
  • the electromagnetically driven sound unit is a double-acting iron speaker
  • the double-acting iron speaker includes a first moving iron unit and a second moving iron unit
  • the audio player further includes a phase flipper
  • the sound distortion reduction module is connected to the first moving iron unit, one end of the phase inverter is electrically connected to the sound distortion reduction module, and the other end is electrically connected to the second moving iron unit; or,
  • the electromagnetically driven sound generating unit is a double moving coil speaker
  • the double moving coil speaker includes a first moving coil unit and a second moving coil unit
  • the audio player further includes a phase flipper
  • the sound distortion reduction module is connected To the first moving coil unit, one end of the phase flipper is electrically connected to the sound distortion reduction module, and the other end is electrically connected to the second moving coil unit.
  • the frequency of the AC bias signal is greater than 20KHz.
  • a method for reducing sound distortion the audio player includes an electromagnetic drive sounding unit and an audio signal receiver, the audio signal receiver is used to receive audio signals and input the audio signals to the electromagnetic drive sounding unit,
  • the audio player further includes a sound distortion reduction module for generating an AC bias signal, and the method for reducing sound distortion includes:
  • the audio signal receiver obtains an audio signal
  • the sound distortion reduction module generates an AC bias signal
  • the AC bias signal and the audio signal are input into the electromagnetic drive sound generating unit.
  • the method for reducing sound distortion further includes:
  • the sound distortion reduction module detects whether the audio signal receiver has acquired the audio signal
  • the AC bias signal is generated.
  • the method for reducing sound distortion further includes:
  • the sound distortion reduction module continuously detects whether the audio signal receiver has acquired the audio signal
  • the sound distortion reduction module detects that the audio signal receiver has not acquired the audio signal within a preset time range, it stops generating the AC bias signal.
  • a sound distortion reduction module includes a controller and a memory, the memory stores a program, and the controller is configured to execute the program to implement the above-mentioned sound distortion reduction method.
  • the present invention has the following beneficial effects:
  • the audio player provided by the present invention generates an AC bias signal by setting a sound distortion reduction module, and the generated AC bias signal is superimposed with the audio signal when input to the electromagnetic drive sound unit, so that the input audio signal is from positive to negative or from
  • the negative to positive conversion process can reduce the non-linear factors caused by the hysteresis phenomenon, which can effectively improve the harmonic distortion of the audio signal near the positive and negative transition points, and improve the sound quality.
  • Fig. 1 is a schematic block diagram of an audio player disclosed in an embodiment of the present invention
  • Figure 2 is a schematic structural diagram of a single-action iron earphone disclosed in an embodiment of the present invention
  • FIG. 3 is a functional block diagram of the dual-action iron earphones disclosed in an embodiment of the present invention for eliminating AC bias signals;
  • FIG. 4 is a schematic flowchart of a method for reducing sound distortion disclosed in an embodiment of the present invention.
  • FIG. 5 is a schematic flowchart of a modified implementation of the method for reducing sound distortion disclosed in an embodiment of the present invention
  • FIG. 6 is a schematic flowchart of another modified implementation of the method for reducing sound distortion disclosed in an embodiment of the present invention.
  • FIG. 7 is a principle block diagram of a sound distortion reduction module disclosed in an embodiment of the present invention.
  • an embodiment of the present invention discloses an audio player, including an electromagnetic drive sound unit 11, an audio signal receiver 12, a sound distortion reduction module 13, an audio signal receiver 12 and a sound distortion reduction module 13 are electrically connected to the electromagnetic drive sound unit 11; the audio signal receiver 12 is used to receive audio signals and input the audio signals to the electromagnetic drive sound unit 11, and the sound distortion reduction module 13 is used to generate AC bias signals and communicate The bias signal is input to the electromagnetic driving sounding unit 11.
  • the audio player can be earphones or speakers.
  • the electromagnetically driven sound generating unit 11 is used to convert the audio signal into sound through the principle of electromagnetic conversion.
  • the electromagnetically driven sound generating unit 11 may be, but is not limited to, a moving coil speaker or a moving iron speaker.
  • the following takes a single-action iron speaker as an example to explain the principle of electromagnetic conversion.
  • the single-action iron speaker includes a moving iron 111, a pole piece 112, a coil 113, a first magnet 114, a second magnet 115, a diaphragm 116, and
  • the driving rod 117, the moving iron 111 and the pole piece 112 are all U-shaped.
  • the moving iron 111 includes a first side plate 1111 and a second side plate 1112 disposed oppositely, and the pole piece 112 includes a third side plate 1121 and a fourth side plate 1121 disposed oppositely.
  • the first magnet 114 is disposed on the side of the third side plate 1121 facing the fourth side plate 1122, the second magnet 115 is disposed on the side of the fourth side plate 1122 facing the third side plate 1121, and the first magnet 114 and The second magnet 115 has opposite magnetic properties.
  • the end of the second side plate 1112 is located between the first magnet 114 and the second magnet 115, and there is a gap between the second side plate 1112 and the first magnet 114 and the second magnet 115.
  • the coil 113 is wound around the part of the second side plate 1112 outside the first magnet 114 and the second magnet 115, the diaphragm 116 is arranged on the side of the second side plate 1112 away from the first side plate 1111, the diaphragm 116 and
  • the second side plates 1112 are connected through a driving rod 117, and the coil 113 is connected to the audio signal receiver 12 through a wire 118.
  • the audio signal received by the audio signal receiver 12 from the external audio source device is transmitted to the coil 113 through the wire, and the electrical signal is connected to the coil 113 to cause the second side plate 1112 to generate magnetism, and the polarity of the audio signal changes
  • the magnetism of the second side plate changes, the second side plate 1112 shakes up and down under the magnetic attraction of the first magnet 114 and the second magnet 115, and the second side plate 1112 that shakes up and down is driven by the drive rod 117.
  • the diaphragm 116 vibrates to form sound waves.
  • the audio signal receiver 12 may obtain audio signals from the external audio source device 100 in a wired or wireless manner.
  • the audio signal receiver 12 can be, but is not limited to, an audio signal line or a Bluetooth module.
  • the sound distortion reduction module 13 includes one or more processors, and the processor may be a central processing unit (CPU), or other general-purpose processors, or digital signal processors (DSP). , Application Specific Integrated Circuit (ASIC), Field-Programmable Gate Array (FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components, etc.
  • the general-purpose processor can be a microprocessor or the processor can also be any conventional processor.
  • the processor is the control center of the sound distortion reduction module 13 and uses various interfaces and lines to connect the electromagnetic drive sound unit 11.
  • the audio player provided in this embodiment generates an AC bias signal by setting the sound distortion reduction module 13, and the generated AC bias signal is superimposed with the audio signal when input to the electromagnetic drive sound unit 11, so that the audio signal input into the coil During the transition from positive to negative or from negative to positive, non-linear factors caused by hysteresis can be reduced, which can effectively improve the harmonic distortion of audio signals near the positive and negative transition points and improve sound quality.
  • the frequency of the AC bias signal is greater than 20KHz.
  • the audio frequency above 20KHz belongs to the ultrasonic range, and the human ear cannot perceive it, which can reduce the influence of AC bias signal on sound quality.
  • the AC bias signal is 50-60KHz.
  • the AC bias signal is a sine wave, a square wave or a triangle wave.
  • the frequency of the AC bias signal is 60KHz, and the amplitude is -18dBFS to 0dBFS.
  • the 60KHz AC bias signal is superimposed with the 250Hz sound wave signal, the amplitude of the AC bias signal is set to 0dBFS, and it is attenuated to -18dBFS at a rate of 2dB per second. It is found that when the amplitude of the AC bias signal is 0dBFS, the harmonic distortion of the acoustic signal is the least obvious. When the amplitude of the AC bias signal attenuates from 0dBFS to -18dBFS, the harmonic distortion of the acoustic signal gradually increases with time. After the -18dBFS demarcation point, the AC bias signal basically has no effect on the harmonic distortion of the acoustic signal.
  • the sound distortion reduction module 13 is electrically connected to the audio signal receiver 12.
  • the sound distortion reduction module 13 is used to detect whether the audio signal receiver 12 inputs an audio signal, and when the audio signal is detected When the signal is input, an AC bias signal is generated.
  • the AC bias signal is generated by reducing the sound distortion module 13 when the audio signal is detected, which can save power, especially when the audio player is provided with an independent power storage module to provide the required power, this setting method Can significantly improve the endurance of the audio player.
  • the sound distortion reduction module 13 is also used to generate the AC bias signal, if the audio signal receiver 12 detects that the audio signal receiver 12 does not obtain the audio signal within the preset time range, it stops generating the AC bias signal to further save power.
  • the audio player is also provided with a sound filter, which is used to filter out the AC offset signal mixed in the sound played by the audio player, and reduce the impact of the AC offset signal on the sound quality. influences.
  • a sound filter which is used to filter out the AC offset signal mixed in the sound played by the audio player, and reduce the impact of the AC offset signal on the sound quality. influences.
  • the following takes the audio player as a single-action iron earphone as an example to specifically describe the arrangement of the sound filter in the audio player.
  • the earphone 20 includes a housing 21, and the housing 21 has an inner cavity 22.
  • the housing 21 is provided with a sound hole 23 communicating with the inner cavity 22, the electromagnetically driven sounding unit 11 is arranged inside the housing 21, and the electromagnetically driven sounding unit 11 and the housing 21 are enclosed to form a sound channel 24 communicating with the sounding hole 23.
  • the sound filter 14 is arranged at the sound hole 23 or the sound channel 24 to filter out AC bias signals.
  • the setting method of the sound filter can refer to the above setting method, which will not be repeated here.
  • the setting method of the sound filter can also refer to the above setting method, which will not be repeated.
  • the electromagnetically driven sounding unit 11 can also adopt a double-acting iron speaker 30, which includes a first moving iron unit 31 and a second moving iron unit 32.
  • the audio player also includes a phase flipper 15.
  • the sound distortion reduction module 13 is connected to the first moving iron unit 31.
  • One end of the phase flipper 15 is electrically connected to the sound distortion reduction module 13 and the other end is electrically connected to the second moving iron. Unit 32.
  • the AC bias signal input to the first moving iron unit 31 and the AC bias signal input to the second moving iron unit 32 have opposite phases.
  • the two AC bias signals are in the double moving iron speaker 30.
  • the sound output terminal can be superimposed to cancel, avoiding the influence of AC bias signal on sound quality.
  • the double moving coil speaker includes a first moving coil unit and a second moving coil unit.
  • the connection relationship between the sound distortion reduction module 13, the phase flipper 15, the first moving coil unit, and the second moving coil unit can refer to the connection relationship between the double-acting iron speaker 30 and the phase flipper 15 described above, and will not be repeated here.
  • an embodiment of the present invention discloses a method for reducing sound distortion.
  • the audio player includes an electromagnetic drive sounding unit and an audio signal receiver.
  • the audio signal receiver is used to receive audio signals and input the audio signals to the electromagnetic drive for sound.
  • the audio player further includes a sound distortion reduction module for generating an AC bias signal, and the method for reducing sound distortion includes:
  • Step S11 the audio signal receiver obtains the audio signal
  • Step S12 the sound distortion reduction module generates an AC bias signal
  • Step S13 input the AC bias signal and the audio signal to the electromagnetic drive sound generating unit.
  • the method for reducing sound distortion generates an AC bias signal by setting the sound distortion reduction module 13, and the generated AC bias signal is superimposed with the audio signal when it is input into the electromagnetic drive sound unit 11, which can effectively improve the audio signal in the positive and negative poles. Harmonic distortion problems that occur near the switching point improve the sound quality.
  • the method for reducing sound distortion further includes:
  • Step T11 the sound distortion reduction module detects whether the audio signal receiver has acquired the audio signal
  • Step T12 If the audio signal receiver obtains the audio signal, generate the AC bias signal.
  • the method S10 for reducing sound distortion further includes:
  • Step M11 the sound distortion reduction module continuously detects whether the audio signal receiver has acquired the audio signal
  • Step M12 if the sound distortion reduction module detects that the audio signal receiver has not acquired the audio signal within a preset time range, stop generating the AC bias signal.
  • a sound distortion reduction module 40 disclosed in an embodiment of the present invention includes a controller 41 and a memory 42.
  • the memory 42 stores a program
  • the controller 41 is configured to execute the program to implement the above-mentioned sound distortion reduction method.
  • the memory 42 may mainly include a program storage area and a data storage area.
  • the program storage area may store an operating system and application programs required by multiple functions (such as audio data detection function, detection signal generation function, AC bias signal generation, etc.) And so on; the data storage area can store temporarily received audio signals, etc.

Abstract

本发明公开了音频播放器、降低声音失真的方法以及降低声音失真模组，其中，音频播放器包括电磁驱动发声单元、音频信号接收器以及降低声音失真模组，音频信号接收器和降低声音失真模组都电性连接至电磁驱动发声单元；音频信号接收器用于接收音频信号并将音频信号输入至所述电磁驱动发声单元，降低声音失真模组用于产生交流偏置信号并将交流偏置信号输入至电磁驱动发声单元。本发明公开的音频播放器通过设置降低声音失真模组生成交流偏置信号，交流偏置信号与音频信号叠加，使得输入的音频信号从正极到负极或者从负极到正极转换过程中可以减少由于磁滞现象产生的非线性因素，可以有效改善音频信号在正负极转换点附近出现的谐波失真问题，提升音质。

Description

音频播放器、降低声音失真的方法以及降低声音失真模组 技术领域
本发明涉及电子设备领域，尤其涉及一种音频播放器、一种降低声音失真的方法以及一种降低声音失真模组。
背景技术
音频播放器的电磁驱动发声单元常见的有动圈和动铁两种方式，这两种方式都采用了电磁转换的原理，而电磁转换的过程中存在着磁滞现象，即磁感应强度的变化总是滞后于磁场强度的变化，导致音频播放器的传输信号从正极导负极或者从负极到正极的转换点附近存在着一些非线性因素，这种声音与输入信号的振幅不是线性变化的现象造成谐波失真，导致音质不好。
发明内容
为了克服现有技术的不足，本发明的目的之一公开一种音频播放器，用以解决现有的音频播放器，声音与输入信号的振幅不是线性变化的现象造成谐波失真，导致音质不好的问题。本发明的目的之二公开一种降低声音失真的方法。本发明的目的之三公开一种降低声音失真模组。
本发明的目的之一采用如下技术方案实现：
一种音频播放器，包括电磁驱动发声单元、音频信号接收器以及降低声音失真模组，所述音频信号接收器和所述降低声音失真模组都电性连接至所述电磁驱动发声单元；所述音频信号接收器用于接收音频信号并将所述音频信号输入至所述电磁驱动发声单元，所述降低声音失真模组用于产生交流偏置信号并 将所述交流偏置信号输入至所述电磁驱动发声单元。
作为一种改进方式，所述降低声音失真模组与所述音频信号接收器电性连接，所述降低声音失真模组用于检测所述音频信号接收器是否输入音频信号，并当检测到音频信号输入时，生成所述交流偏置信号。
作为一种改进方式，所述音频播放器还包括壳体，所述壳体具有内腔，所述壳体上开设有连通所述内腔的出声孔，所述电磁驱动发声单元设置于所述壳体内部，所述电磁驱动发声单元和所述壳体围合形成连通所述出声孔的声道；所述电磁驱动发声单元为单动圈扬声器，所述音频播放器还包括声音滤波器，所述声音滤波器设置于所述出声孔处或者所述声道中以滤除所述交流偏置信号。
作为一种改进方式，所述音频播放器还包括壳体，所述壳体具有内腔，所述壳体上开设有连通所述内腔的出声孔，所述电磁驱动发声单元设置于所述壳体内部，所述电磁驱动发声单元和所述壳体围合形成连通所述出声孔的声道；所述电磁驱动发声单元为单动铁扬声器，所述音频播放器还包括声音滤波器，所述声音滤波器设置于所述出声孔处或者所述声道中以滤除所述交流偏置信号。
作为一种改进方式，所述电磁驱动发声单元为双动铁扬声器，所述双动铁扬声器包括第一动铁单元和第二动铁单元，所述音频播放器还包括相位翻转器，所述降低声音失真模组连接至所述第一动铁单元，所述相位翻转器一端电连接至所述降低声音失真模组、另一端电连接至所述第二动铁单元；或者，
所述电磁驱动发声单元为双动圈扬声器，所述双动圈扬声器包括第一动圈单元和第二动圈单元，所述音频播放器还包括相位翻转器，所述降低声音失真模组连接至所述第一动圈单元，所述相位翻转器一端电连接至所述降低声音失 真模组、另一端电连接至所述第二动圈单元。
作为一种改进方式，所述交流偏置信号的频率大于20KHz。
本发明的目的之二采用如下技术方案实现：
一种降低音声音失真的方法，所述音频播放器包括电磁驱动发声单元和音频信号接收器，所述音频信号接收器用于接收音频信号并将所述音频信号输入至所述电磁驱动发声单元，所述音频播放器还包括用于产生交流偏置信号的降低声音失真模组，所述降低声音失真的方法包括：
所述音频信号接收器获取音频信号；
所述降低声音失真模组生成交流偏置信号；
将所述交流偏置信号和所述音频信号输入至所述电磁驱动发声单元中。
作为一种改进方式，在生成所述交流偏置信号之前，所述降低声音失真的方法还包括：
所述降低声音失真模组检测所述音频信号接收器是否获取到所述音频信号；
若所述音频信号接收器获取到所述音频信号，生成所述交流偏置信号。
作为一种改进方式，生成交流偏置信号之后，所述降低声音失真的方法还包括：
所述降低声音失真模组持续检测所述音频信号接收器是否获取到所述音频信号；
若所述降低声音失真模组检测到所述音频信号接收器在预设时间范围内未获取到所述音频信号，停止生成所述交流偏置信号。
本发明的目的之三采用如下技术方案实现：
一种降低声音失真模组，包括控制器和存储器，所述存储器存储有程序， 所述控制器用于执行所述程序实现上述降低声音失真的方法。
相比现有技术，本发明的有益效果在于：
本发明提供的音频播放器通过设置降低声音失真模组生成交流偏置信号，生成的交流偏置信号输入至电磁驱动发声单元中时与音频信号叠加，使得输入的音频信号从正极到负极或者从负极到正极转换过程中可以减少由于磁滞现象产生的非线性因素，从而可以有效改善音频信号在正负极的转换点附近出现的谐波失真问题，提升音质。
附图说明
图1为本发明实施例公开的音频播放器的原理框图；
图2为本发明实施例公开的单动铁耳机的结构示意图；
图3为本发明实施例公开的双动铁耳机消除交流偏置信号的原理框图；
图4为本发明实施例公开的降低声音失真的方法的流程示意图；
图5为本发明实施例公开的降低声音失真的方法的一种变形实施方式的流程示意图；
图6为本发明实施例公开的降低声音失真的方法的另一种变形实施方式的流程示意图；
图7为本发明实施例公开的降低声音失真模组的原理框图。
具体实施方式
下面，结合附图以及具体实施方式，对本发明做进一步描述，需要说明的是，在不相冲突的前提下，以下描述的各实施例之间或各技术特征之间可以任意组合形成新的实施例。
请参阅图1和图2，本发明实施例公开一种音频播放器，包括电磁驱动发声单元11、音频信号接收器12、降低声音失真模组13，音频信号接收器12和降低声音失真模组13都电性连接至电磁驱动发声单元11；音频信号接收器12用于接收音频信号并将音频信号输入至电磁驱动发声单元11，降低声音失真模组13用于产生交流偏置信号并将交流偏置信号输入至电磁驱动发声单元11。
其中，音频播放器可以为耳机或者音响。
其中，电磁驱动发声单元11用于通过电磁转换原理将音频信号转换为声音。电磁驱动发声单元11可以为但不限于动圈扬声器或者动铁扬声器。以下以单动铁扬声器为例，解释电磁转换原理，如图2所示，单动铁扬声器包括动铁111、极片112、线圈113、第一磁体114、第二磁体115、振膜116以及驱动棒117，动铁111和极片112都呈U形，动铁111包括相对设置的第一侧板1111和第二侧板1112，极片112包括相对设置的第三侧板1121和第四侧板1122，动铁111与极片112开口相向，第一侧板1111与第三侧板1121搭接，第二侧板1112的端部位于第三侧板1121与第四侧板1122之间，第一磁体114设置于第三侧板1121之朝向第四侧板1122的一侧，第二磁体115设置于第四侧板1122之朝向第三侧板1121的一侧，第一磁体114与第二磁体115磁性相反，第二侧板1112的端部位于第一磁体114与第二磁体115之间，且第二侧板1112和第一磁体114、第二磁体115之间都留存有间隙，线圈113缠绕在第二侧板1112之位于第一磁体114和第二磁体115外的部分，振膜116设置于第二侧板1112之远离第一侧板1111的一侧，振膜116和第二侧板1112之间通过驱动棒117进行连接，线圈113通过导线118与音频信号接收器12连接。单动铁扬声器使用时，音频信号接收器12从外部音源设备接收的音频信号通过导线传递给线圈113，线圈113中通入电信号使得第二侧板1112产生磁性，音频信号的极性发生变化时，第二 侧板的磁性发生变化，这样，第二侧板1112在第一磁体114和第二磁体115的磁吸作用下，上下抖动，上下抖动的第二侧板1112通过驱动棒117带动振膜116振动从而形成声波。
其中，音频信号接收器12可以通过有线或者无线的方式从外部音频源设备100获取音频信号。音频信号接收器12可以为但不局限于音频信号线，或者蓝牙模块。
其中，降低声音失真模组13包括一个或者多个处理器，处理器可以是中央处理单元(Central Processing Unit，CPU)，还可以是其他通用处理器、数字信号处理器(Digital Signal Processor，DSP)、专用集成电路(Application Specific Integrated Circuit，ASIC)、现场可编程门阵列(Field-Programmable Gate Array，FPGA)或者其他可编程逻辑器件、分立门或者晶体管逻辑器件、分立硬件组件等。通用处理器可以是微处理器或者该处理器也可以是任何常规的处理器等，处理器是降低声音失真模组13的控制中心，利用各种接口和线路连接电磁驱动发声单元11。
本实施例提供的音频播放器通过设置降低声音失真模组13生成交流偏置信号，生成的交流偏置信号输入至电磁驱动发声单元11中时与音频信号叠加，使得输入到线圈中的音频信号从正极到负极或者从负极到正极转换过程中可以减少由于磁滞现象产生的非线性因素，从而可以有效改善音频信号在正负极的转换点附近出现的谐波失真问题，提升音质。
优选地，交流偏置信号的频率大于20KHz。20KHz以上的音频属于超声波范围，人耳无法感知，可以降低交流偏置信号对音质的影响。优选地，该交流偏置信号取50-60KHz。
优选地，交流偏置信号为正弦波、方波或者三角波。
优选地，交流偏置信号的频率为60KHz，振幅为-18dBFS～0dBFS。
在本发明提供的一个实验例中：将60KHz的交流偏置信号与250Hz声波信号进行叠加，设置交流偏置信号的振幅为0dBFS，并以每秒2dB的速度衰减至-18dBFS。发现在交流偏置信号的振幅为0dBFS处，声波信号的谐波失真现象最不明显，当交流偏置信号的振幅从0dBFS衰减至-18dBFS，声波信号的谐波失真现象随时间慢慢递增，过了-18dBFS分界点以后，交流偏置信号对声波信号的谐波失真现象基本不起作用。也即，当交流偏置信号的频率为60KHz，将振幅范围设置为-18dBFS～0dBFS之间时，可以改善声波信号的谐波失真现象。作为本实施例的一种改进方式，降低声音失真模组13与音频信号接收器12电性连接，降低声音失真模组13用于检测音频信号接收器12是否输入音频信号，并当检测到音频信号输入时，生成交流偏置信号。该实施方式通过检测到音频信号时降低声音失真模组13才产生交流偏置信号，可以节省电源，特别是当该音频播放器通过设置独立的蓄电模块以提供所需电源时，该设置方式可以明显提升该音频播放器的续航能力。此外，该降低声音失真模组13还用于生成交流偏置信号之后，若检测到音频信号接收器12在预设时间范围内未获取到音频信号，停止生成交流偏置信号，进一步节省电源。
作为本实施例的一种改进方式，音频播放器还设有声音滤波器，该声音滤波器用于滤除音频播放器播放出的声音中夹杂的交流偏置信号，降低交流偏置信号对音质的影响。以下以该音频播放器是单动铁耳机为例具体说明所述声音滤波器在音频播放器中的设置方式，如图2所示，耳机20包括壳体21，壳体21具有内腔22，壳体21上开设有连通内腔22的出声孔23，电磁驱动发声单元11设置于壳体21内部，电磁驱动发声单元11和壳体21围合形成连通出声孔23的声道24，声音滤波器14设置于出声孔处23或者声道24中以滤除交流偏 置信号。当该音频播放器为音响时，声音滤波器的设置方式可以参考上述的设置方式，在此不做赘述。此外，当电磁驱动发声单元11采用单动圈扬声器时，声音滤波器的设置方式也可以参考上述的设置方式，不做赘述。
请参阅图3，作为本实施例的一种改进方式，电磁驱动发声单元11还可以采用双动铁扬声器30，该双动铁扬声器30包括第一动铁单元31和第二动铁单元32，该音频播放器还包括相位翻转器15，降低声音失真模组13连接至第一动铁单元31，相位翻转器15一端电连接至降低声音失真模组13、另一端电连接至第二动铁单元32。通过相位翻转器15的翻转，输入第一动铁单元31的交流偏置信号和输入第二动铁单元32的交流偏置信号的相位相反，两个交流偏置信号在双动铁扬声器30的声音输出端可以进行叠加抵消，避免了交流偏置信号对音质的影响。可以理解地，当电磁驱动发声单元11采用双动圈扬声器时，也可以通过设置上述的相位翻转器15来避免交流偏置信号对音质的影响。该双动圈扬声器包括第一动圈单元和第二动圈单元。降低声音失真模组13、相位翻转器15、第一动圈单元以及第二动圈单元的连接关系可以参考上述的双动铁扬声器30和相位翻转器15的连接关系，在此不做赘述。
请参阅图4，本发明实施例公开的一种降低声音失真的方法，音频播放器包括电磁驱动发声单元和音频信号接收器，音频信号接收器用于接收音频信号并将音频信号输入至电磁驱动发声单元，该音频播放器还包括用于产生交流偏置信号的降低声音失真模组，所述降低声音失真的方法包括：
步骤S11，音频信号接收器获取音频信号；
步骤S12，降低声音失真模组生成交流偏置信号；
步骤S13，将所述交流偏置信号和所述音频信号输入至所述电磁驱动发声单元中。
该降低声音失真的方法通过设置降低声音失真模组13生成交流偏置信号，生成的交流偏置信号输入至电磁驱动发声单元11中时与音频信号叠加，可以有效改善音频信号在正负极的转换点附近出现的谐波失真问题，提升音质。
请参阅图5，作为本实施例的一种改进方式，在生成交流偏置信号之前，所述降低声音失真的方法还包括：
步骤T11，所述降低声音失真模组检测音频信号接收器是否获取到所述音频信号；
步骤T12，若音频信号接收器获取到所述音频信号，生成所述交流偏置信号。
请参阅图6，作为本实施例的一种改进方式，生成交流偏置信号之后，所述降低声音失真的方法S10还包括：
步骤M11，所述降低声音失真模组持续检测所述音频信号接收器是否获取到所述音频信号；
步骤M12，若所述降低声音失真模组检测到音频信号接收器在预设时间范围内未获取到所述音频信号，停止生成所述交流偏置信号。
请参阅图7，本发明实施例公开的一种降低声音失真模组40，包括控制器41和存储器42，存储器42存储有程序，控制器41用于执行程序实现上述的降低声音失真的方法。
其中，存储器42可主要包括程序存储区和数据存储区，程序存储区可存储操作系统、多个功能所需的应用程序(比如检测音频数据功能、生成检测信号功能、生成交流偏置信号等)等；数据存储区可存储临时接收的音频信号等。
上述实施方式仅为本发明的优选实施方式，不能以此来限定本发明保护的范围，本领域的技术人员在本发明的基础上所做的任何非实质性的变化及替换均属于本发明所要求保护的范围。

Claims (10)

  1. 一种音频播放器，其特征在于，包括电磁驱动发声单元、音频信号接收器以及降低声音失真模组，所述音频信号接收器和所述降低声音失真模组都电性连接至所述电磁驱动发声单元；所述音频信号接收器用于接收音频信号并将所述音频信号输入至所述电磁驱动发声单元，所述降低声音失真模组用于产生交流偏置信号并将所述交流偏置信号输入至所述电磁驱动发声单元。
  2. 根据权利要求1所述的音频播放器，其特征在于，所述降低声音失真模组与所述音频信号接收器电性连接，所述降低声音失真模组用于检测所述音频信号接收器是否输入音频信号，并当检测到音频信号输入时，生成所述交流偏置信号。
  3. 根据权利要求1所述的音频播放器，其特征在于，所述音频播放器还包括壳体，所述壳体具有内腔，所述壳体上开设有连通所述内腔的出声孔，所述电磁驱动发声单元设置于所述壳体内部，所述电磁驱动发声单元和所述壳体围合形成连通所述出声孔的声道；所述电磁驱动发声单元为单动圈扬声器，所述音频播放器还包括声音滤波器，所述声音滤波器设置于所述出声孔处或者所述声道中以滤除所述交流偏置信号。
  4. 根据权利要求1所述的音频播放器，其特征在于，所述音频播放器还包括壳体，所述壳体具有内腔，所述壳体上开设有连通所述内腔的出声孔，所述电磁驱动发声单元设置于所述壳体内部，所述电磁驱动发声单元和所述壳体围合形成连通所述出声孔的声道；所述电磁驱动发声单元为单动铁扬声器，所述音频播放器还包括声音滤波器，所述声音滤波器设置于所述出声孔处或者所述声道中以滤除所述交流偏置信号。
  5. 根据权利要求1所述的音频播放器，其特征在于，所述电磁驱动发声单元为双动铁扬声器，所述双动铁扬声器包括第一动铁单元和第二动铁单元，所 述音频播放器还包括相位翻转器，所述降低声音失真模组连接至所述第一动铁单元，所述相位翻转器一端电连接至所述降低声音失真模组、另一端电连接至所述第二动铁单元；或者，
    所述电磁驱动发声单元为双动圈扬声器，所述双动圈扬声器包括第一动圈单元和第二动圈单元，所述音频播放器还包括相位翻转器，所述降低声音失真模组连接至所述第一动圈单元，所述相位翻转器一端电连接至所述降低声音失真模组、另一端电连接至所述第二动圈单元。
  6. 根据权利要求1-5任一项所述的降低声音失真的方法，其特征在于，所述交流偏置信号的频率大于20KHz。
  7. 一种降低声音失真的方法，音频播放器包括电磁驱动发声单元和音频信号接收器，所述音频信号接收器用于接收音频信号并将所述音频信号输入至所述电磁驱动发声单元，其特征在于，所述音频播放器还包括用于产生交流偏置信号的降低声音失真模组，所述降低声音失真的方法包括：
    所述音频信号接收器获取音频信号；
    所述降低声音失真模组生成交流偏置信号；
    将所述交流偏置信号和所述音频信号输入至所述电磁驱动发声单元中。
  8. 根据权利要求7所述的降低声音失真的方法，其特征在于，在生成所述交流偏置信号之前，所述降低声音失真的方法还包括：
    所述降低声音失真模组检测所述音频信号接收器是否获取到所述音频信号；
    若所述音频信号接收器获取到所述音频信号，生成所述交流偏置信号。
  9. 根据权利要求8所述的降低声音失真的方法，其特征在于，生成交流偏置信号之后，所述降低声音失真的方法还包括：
    所述降低声音失真模组持续检测所述音频信号接收器是否获取到所述音频信号；
    若所述降低声音失真模组检测到所述音频信号接收器在预设时间范围内未获取到所述音频信号，停止生成所述交流偏置信号。
  10. 一种降低声音失真模组，其特征在于，包括控制器和存储器，所述存储器存储有程序，所述控制器用于执行所述程序实现如权利要求7-9任意一项所述降低声音失真的方法。
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US20160241962A1 (en) * 2013-10-25 2016-08-18 Kaetel Systems Gmbh Headphones and method for producing headphones
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