WO2022007239A1 - 音质自适应调节方法、相关系统和设备及存储介质 - Google Patents

音质自适应调节方法、相关系统和设备及存储介质 Download PDF

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Publication number
WO2022007239A1
WO2022007239A1 PCT/CN2020/122536 CN2020122536W WO2022007239A1 WO 2022007239 A1 WO2022007239 A1 WO 2022007239A1 CN 2020122536 W CN2020122536 W CN 2020122536W WO 2022007239 A1 WO2022007239 A1 WO 2022007239A1
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pressure level
sound pressure
audio system
noise
frequency
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PCT/CN2020/122536
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English (en)
French (fr)
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孙舒远
黄兴志
张欣
黄翔
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瑞声声学科技(深圳)有限公司
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Publication of WO2022007239A1 publication Critical patent/WO2022007239A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards
    • H04N5/60—Receiver circuitry for the reception of television signals according to analogue transmission standards for the sound signals
    • H04N5/602—Receiver circuitry for the reception of television signals according to analogue transmission standards for the sound signals for digital sound signals
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10L—SPEECH ANALYSIS OR SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING; SPEECH OR AUDIO CODING OR DECODING
    • G10L21/00—Processing of the speech or voice signal to produce another audible or non-audible signal, e.g. visual or tactile, in order to modify its quality or its intelligibility
    • G10L21/02—Speech enhancement, e.g. noise reduction or echo cancellation

Definitions

  • the present invention relates to the field of smart home, in particular to a sound quality adaptive adjustment method applied to a display device, an audio system, a display device and a computer-readable storage medium.
  • the purpose of the present invention is to provide a sound quality adaptive adjustment method, audio system, display device and computer-readable storage medium with high signal-to-noise ratio and good sound quality of output audio.
  • the present invention provides an adaptive adjustment method for sound quality.
  • the method is applied to an audio system.
  • the audio system includes a speaker, a processing module and a power amplification module.
  • the method includes the following steps:
  • Step S1 the audio system collects the background noise of the environment where it is located
  • Step S2 the processing module performs noise analysis on the background noise, and calculates the total output sound pressure level SPL Noise of the background noise according to the analysis result, and the analysis result includes the number of frequency bands, frequency components and the sound pressure level corresponding to each of the frequency components;
  • Step S3 the processing module calculates the gain size of each of the frequency bands that the power amplifying module needs to adjust according to the analysis result
  • Step S4 the processing module calculates the overall output sound pressure level SPL Final (f) that needs to be generated at the target position according to the distance between the target position and the speaker , so as to meet the preset signal-to-noise ratio;
  • Step S5 the power amplifier module for each band adaptive gain G (f) according to the general output sound pressure level SPL Final (f), and according to a preset play mode playback through said speaker.
  • the total output sound pressure level SPL Noise satisfies the following formula:
  • the corresponding output sound pressure level of one frequency f n of the background noise is SPL n , which is expressed as SPL n ( f ) , N is the number of frequency bands included in the background noise, and w ( f ) is in accordance with ISO-226 Weighting coefficient of each frequency component calculated by the specified equal loudness curve.
  • the number of frequency bands is generated by dividing the frequency components according to the number of octaves, and the number of octaves includes 1 octave, 1/3 octave, 1/6 octave, and 1/12
  • the sound pressure level of each of the frequency components of the background noise is calculated by the processing module, and is generated after weighted accumulation according to the equal loudness curve of the human ear for each frequency.
  • the total output sound pressure level SPL Noise is calculated by the processing module, and is generated after weighted accumulation according to the equal loudness curve of the human ear for each frequency.
  • the preset signal-to-noise ratio is satisfied that the overall output sound pressure level SPL Final ( f ) is 35dB higher than the total output sound pressure level SPL Noise.
  • the overall output sound pressure level SPL Final ( f ) satisfies the following formula:
  • G( f ) is the gain of each of the frequencies
  • SPL s ( f ) the sensitivity and frequency relationship function of the speaker of the audio system at 1 meter
  • L is the distance from the audio system to the target position distance.
  • the audio system satisfies the following formula under the condition of a signal-to-noise ratio of 35dB:
  • Target 1 ( f ) is the relationship function between frequency and sound pressure level in high fidelity mode.
  • the audio system satisfies the following formula when the preset playback mode is the high volume mode:
  • Target 2 ( f ) is the relationship function between frequency and sound pressure level in high volume mode.
  • the power amplifying module adaptively adjusts the gain G(f) of each frequency band according to the overall output sound pressure level SPL Final ( f ) by separately adjusting different frequency bands.
  • the present invention also provides an audio system, the audio system is applied to a display device, and the audio system includes:
  • Microphone used to collect background noise of its environment
  • a processing module configured to perform noise analysis on the background noise, calculate the total output sound pressure level SPL Noise of the background noise according to the analysis result, and calculate each of the frequency bands that the power amplification module needs to adjust according to the analysis result According to the distance between the target position and the speaker, the overall output sound pressure level SPL Final (f) that needs to be generated at the target position is calculated to meet the preset signal-to-noise ratio, and the analysis result includes all The number of frequency bands N of the background noise, the frequency components, and the sound pressure level corresponding to each of the frequency components;
  • a power amplifying module for adaptively adjusting the gain of all frequency bands according to the overall output sound pressure level SPL Final (f) to meet the preset signal-to-noise ratio;
  • a speaker used for playing the audio after the playback gain adjustment is performed according to a preset playback mode
  • a storage module for storing the required software code of the processing module, and providing static memory and dynamic memory required during the operation of the processing module;
  • the power management module is used for power management of the audio system.
  • the present invention also provides an audio system, the system includes a processing module and a storage module, the processing module is configured to read a program in the storage module, and execute the sound quality adaptive adjustment method described in any one of the above steps in .
  • the present invention also provides a display device comprising the audio system as described above.
  • a sound quality adaptive adjustment method, an audio system, a display device and a computer-readable storage medium of the present invention include the following steps: Step S1, the audio system collects the background noise of the environment in which it is located. Step S2, the processing module performs noise analysis on the background noise, and calculates the total output sound pressure level SPL Noise of the background noise according to the analysis result, and the analysis result includes the frequency band number N of the background noise, frequency component and the sound pressure level corresponding to each of the frequency components; step S3, the processing module calculates the gain size of each of the frequency bands that the power amplification module needs to adjust according to the analysis result; step S4, the processing module According to the distance between the target position and the speaker, calculate the overall output sound pressure level SPL Final (f) that needs to be generated at the target position to meet the preset signal-to-noise ratio; Step S5, the power amplifying module The overall output sound pressure level SPL Final ( f ) adaptively adjusts the gain G(f) of each frequency band, and plays
  • aspects of the present invention is carried out by the processing module of the above-described step background noise noise analysis, and calculate the output of the overall sound pressure level SPL Final (f), to meet the predetermined SNR, then amplified by the power
  • the module adaptively adjusts the gain G(f) of each frequency band, thereby improving the signal-to-noise ratio of the output audio and making the output audio sound good.
  • Fig. 1 is the flow chart of the self-adaptive adjustment method of sound quality of the present invention
  • FIG. 2 is a diagram showing the relationship between the frequency and the sound pressure level of the background noise of the present invention.
  • Fig. 3 is the sensitivity and frequency relation function of the audio frequency system of the present invention at 1 meter;
  • Fig. 4 is the relational function diagram between the frequency-sound pressure level of the overall output sound pressure of the audio system of the present invention.
  • FIG. 5 is a structural block diagram of the audio system of the present invention.
  • the present invention provides an adaptive adjustment method for sound quality.
  • the method is applied to an audio system, and the audio system includes a speaker, a processing module and a power amplifying module.
  • the audio system may be a circuit integrated in the host of the display device, or may be set apart from the host and externally and independently.
  • the display device is a smart TV.
  • the method for self-adapting sound quality includes the following steps:
  • Step S1 the audio system collects the background noise of the environment in which it is located.
  • Step S2 the processing module performs noise analysis on the background noise, and calculates the total output sound pressure level SPL Noise of the background noise according to the analysis result.
  • the analysis result includes the number of frequency bands, frequency components of the background noise, and a sound pressure level corresponding to each of the frequency components.
  • the noise analysis is to calculate the sound pressure level of each of the frequency components of the background noise through the processing module, and according to the equal loudness curve of the human ear for each frequency, the total generated by the weighted accumulation Output sound pressure level SPL Noise .
  • FIG. 2 is a diagram showing the relationship between the frequency of the background noise and the sound pressure level of the present invention.
  • the curve W1 is represented by SPL n ( f ), and in this step S2, the total output sound pressure level SPL Noise satisfies the following formula:
  • the corresponding output sound pressure level of one frequency f n of the background noise is SPL n , which is expressed as SPL n ( f ) , N is the number of frequency bands included in the background noise, and w ( f ) is in accordance with ISO-226 Weighting coefficient of each frequency component calculated by the specified equal loudness curve.
  • the frequency band number N is generated by dividing the frequency components according to the octave number, and the octave number includes 1 octave, 1/3 octave, 1/6 octave and 1/12 octave Procedure.
  • Step S3 the processing module calculates the gain of each of the frequency bands to be adjusted by the power amplification module according to the analysis result.
  • Step S4 the processing module calculates the overall output sound pressure level SPL Final ( f ) that needs to be generated at the target position according to the distance between the target position and the speaker , so as to satisfy the preset signal-to-noise ratio.
  • FIG. 3 is a function of the relationship between sensitivity and frequency of the audio system of the present invention at a distance of 1 meter.
  • Curve W2 is represented as SPL s ( f ). This is a relational curve determined by the acoustic performance of the loudspeaker components of the audio system itself.
  • G( f ) is the gain of each of the frequencies
  • SPL s ( f ) the sensitivity and frequency relationship function of the speaker of the audio system at 1 meter
  • L is the distance from the audio system to the target position distance. It can be seen from this that after the SPL Final ( f ) is determined, the audio system can adaptively adjust the gain G ( f ) of each of the frequencies.
  • the parameter L is preferably provided by the smart TV manufacturer for each product with corresponding suggestions.
  • the preset signal-to-noise ratio is satisfied that the overall output sound pressure level SPL Final ( f ) is 35dB higher than the total output sound pressure level SPL Noise. This setting is beneficial for the smart TV to ensure a sufficient signal-to-noise ratio under the specified viewing distance.
  • FIG. 4 is a graph showing the relationship between the frequency and the sound pressure level of the overall output sound pressure of the audio system of the present invention.
  • the smart TV generates two SPL Final ( f ) predetermined trends of the overall output sound pressure level at the parameter L.
  • W3 is Target 2 ( f )
  • W4 is Target 1 ( f ).
  • the audio system satisfies the following formula under the condition that the preset playback mode is high-fidelity mode and satisfies the signal-to-noise ratio of 35dB:
  • Target 1 ( f ) is the relationship function between frequency and sound pressure level in high fidelity mode.
  • the output sound pressure level of the smart TV is required to be consistent in both high and low frequency bands, so that the entire curve has a good balance in the whole frequency band.
  • the high-fidelity output of the high-fidelity mode is to adjust the gain of the high and low frequency bands of the power amplifier of the audio system under the condition that the maximum output capacity of the audio system and the maximum bearing capacity of the speakers of the audio system are not exceeded, Make the sound spectrum of the smart TV reach the most balanced state in the high and low frequency bands.
  • the audio system satisfies the following formula when the preset playback mode is the high volume mode:
  • Target 2 ( f ) is the relationship function between frequency and sound pressure level in high volume mode.
  • the calculated SPL Final ( f ) when the background noise is not large, the calculated SPL Final ( f ) is within the maximum output range of the entire audio system and the maximum bearing range of the speaker system of the audio system, and when the background noise gradually becomes larger , the calculated SPL Final ( f ) will gradually increase beyond the maximum output range of the audio system or beyond the maximum bearing capacity of the speaker system. In this case, the effect of the low frequency band is the most obvious. Therefore, when the background noise is large, in the high volume mode, since the human ear is more sensitive to high frequency sound, the low frequency band is not improved, and the output sound pressure level of the high frequency band is mainly increased.
  • the high volume output of the high volume mode is to suppress the gain of the power amplification module of the audio system in the low frequency band under the condition that the maximum output capacity of the audio system and the maximum bearing capacity of the speakers of the audio system are not exceeded, Increasing the gain of the power amplifying module of the audio system in the high frequency band allows the sound spectrum of the smart TV to have a certain imbalance in the high and low frequency bands.
  • Step S5 the power amplifier module for each band adaptive gain G (f) according to the general output sound pressure level SPL Final (f), and according to a preset play mode playback through said speaker.
  • step S5 the way that the power amplifying module adaptively adjusts the gain G(f) of each frequency band according to the overall output sound pressure level SPL Final ( f ) is to adjust the different frequency bands separately.
  • the audio system processing module by the background noise of the noise analysis, and calculate an overall output sound pressure level SPL Final (f), to meet the predetermined SNR, then amplified by the power
  • the module adaptively adjusts the gain G(f) of each frequency band, thereby improving the signal-to-noise ratio of the output audio and making the output audio sound good.
  • the present invention also provides an audio system, which includes a processing module and a storage module, wherein the processing module is configured to read a program in the storage module and execute the steps in the method for self-adapting sound quality.
  • the present invention also provides a computer-readable storage medium, where the computer-readable storage medium stores a program of the sound quality adaptive adjustment method, and when the program of the sound quality adaptive adjustment method is executed by a processor, the sound quality self-adaptation is realized Steps of the adjustment method.
  • the present invention further provides an audio system 100, and the audio system is applied to a display device.
  • the audio system 100 may be a circuit integrated in the host of the display device, or may be set apart from the host and externally and independently.
  • the display device is a smart TV.
  • the audio system 100 is integrated with the main body of the smart TV.
  • the audio system 100 can also be separated from the main body of the smart TV to independently form a set of external devices.
  • the audio system 100 includes a microphone 1 , a processing module 2 , a power amplification module 3 , a speaker 4 , a storage module 5 and a power management module 6 .
  • the microphone 1, the processing module 2, the power amplification module 3, the speaker 4, the storage module 5 and the power management module 6 are all commonly used components in the technical field.
  • the processing module 2, the power amplification module 3, the speaker 4, the storage module 5 and the power management module 6 are all commonly used components in the technical field.
  • the microphone 1 is used to collect the background noise of the environment in which it is located.
  • the microphone 1 is located at the center of the top of the smart TV, and the speakers 4 are located on both sides of the bottom of the smart TV.
  • the microphone 1 includes two, and the two microphones 1 are spaced apart and isolated. Specifically, the two microphones 1 are practically designed to be as far apart as possible to prevent howling in the entire audio system.
  • the processing module 2 is used to perform noise analysis on the background noise, and calculate the total output sound pressure level SPL Noise of the background noise according to the analysis result, and calculate each of the power amplifying module 3 needs to be adjusted according to the analysis result.
  • the overall output sound pressure level SPL Final ( f ) that needs to be generated at the target position is calculated to satisfy the preset signal-to-noise ratio.
  • the analysis result includes the number of frequency bands N of the background noise, the frequency components, and the sound pressure level corresponding to each of the frequency components.
  • the power amplifying module 3 is configured to adaptively adjust the gain of all frequency bands according to the overall output sound pressure level SPL Final ( f ) to meet the preset signal-to-noise ratio.
  • the speaker 4 is used for playing the audio after the playback gain adjustment is performed according to a preset playback mode.
  • the speaker 4 includes a plurality of them.
  • the speakers 4 include three, one of the speakers 4 is arranged in the middle of the display device as a central sound source, and the other two speakers 4 are respectively arranged on both sides of the display device as the left side of the display device. audio source and right audio source.
  • the number of the speakers 4 can also be other numbers, for example, 5, 6, 12 and so on.
  • the storage module 5 is used to store the software codes required by the processing module 2 and provide static memory and dynamic memory required by the processing module 2 during the operation.
  • the power management module 6 is used for power management of the audio system 100 .
  • the present invention also provides a display device, which includes a housing and the audio system 100, and the audio system can be mounted on the inside or the outer surface of the housing.
  • a sound quality adaptive adjustment method, an audio system, a display device and a computer-readable storage medium of the present invention include the following steps: Step S1, the audio system collects the background noise of the environment in which it is located. Step S2, the processing module performs noise analysis on the background noise, and calculates the total output sound pressure level SPL Noise of the background noise according to the analysis result, and the analysis result includes the frequency band number N of the background noise, frequency component and the sound pressure level corresponding to each of the frequency components; step S3, the processing module calculates the gain size of each of the frequency bands that the power amplification module needs to adjust according to the analysis result; step S4, the processing module According to the distance between the target position and the speaker, calculate the overall output sound pressure level SPL Final (f) that needs to be generated at the target position to meet the preset signal-to-noise ratio; Step S5, the power amplifying module The overall output sound pressure level SPL Final ( f ) adaptively adjusts the gain G(f) of each frequency band, and plays
  • aspects of the present invention is carried out by the processing module of the above-described step background noise noise analysis, and calculate the output of the overall sound pressure level SPL Final (f), to meet the predetermined SNR, then amplified by the power
  • the module adaptively adjusts the gain G(f) of each frequency band, thereby improving the signal-to-noise ratio of the output audio and making the output audio sound good.

Abstract

本发明提供了一种音质自适应调节方法，其包括如下步骤：步骤S1、音频系统采集其所处环境的背景噪声；步骤S2、处理模块对背景噪声进行噪声分析，并根据分析结果计算背景噪声的总输出声压级；步骤S3、处理模块根据分析结果计算功率放大模块需要调节的各个频段的增益大小；步骤S4、处理模块根据目标位置与扬声器之间的距离，计算目标位置处所需要产生的总体输出声压级 ，以满足预设信噪比；步骤S5、功率放大模块根据总体输出声压级自适应调节每个频段的增益，并通过扬声器按预设播放模式进行播放。本发明还提供了一种音频系统、显示设备以及计算机可读存储介质。与相关技术相比，采用本发明的技术方案输出音频的信噪比高且音质好。

Description

音质自适应调节方法、相关系统和设备及存储介质 技术领域
本发明涉及智能家居领域，尤其涉及一种应用于显示设备的音质自适应调节方法、音频系统、显示设备以及计算机可读存储介质。
 背景技术
随着智能家居时代的到来，显示设备尤其是智能电视的数量不断上升。目前，智能电视的功能极其多样，其中之一便是高品质的声音。
 技术问题
然而，在在吵杂的环境中，用户期望得到的是高音量的声音；在这种环境下，如果一味的增加智能电视的总体音量输出，一方面会造成超出整个音频系统的输出上限，另一方面会造成超出扬声器本身的承受能力，尤其是低频段的承受能力，导致设备损坏。而在安静的环境下，用户期望得到的是高保真的声音。在这种环境下，音量已经不是首要需求，如果不对智能电视的音频系统做出相应的调整，很难达到用户的预期。
因此，实有必要提供一种新的方法和相关硬件系统来解决上述技术问题。
 技术解决方案
本发明的目的在于提供一种输出音频的信噪比高且音质好的音质自适应调节方法、音频系统、显示设备以及计算机可读存储介质。
为了达到上述目的，本发明提供了一种音质自适应调节方法，该方法运用于音频系统，该音频系统包括扬声器、处理模块和功率放大模块，该方法包括如下步骤：
步骤S1、所述音频系统采集其所处环境的背景噪声；
步骤S2、所述处理模块对所述背景噪声进行噪声分析，并根据分析结果计算所述背景噪声的总输出声压级 SPL Noise ，所述分析结果包括所述背景噪声的频段数、频率成分以及每一所述频率成分对应的声压级；
步骤S3、所述处理模块根据所述分析结果计算所述功率放大模块需要调节的各个所述频段的增益大小；
步骤S4、所述处理模块根据目标位置与所述扬声器之间的距离，计算所述目标位置处所需要产生的总体输出声压级 SPL Final ( f ) ，以满足预设信噪比；
步骤S5、所述功率放大模块根据所述总体输出声压级 SPL Final ( f )自适应调节每个频段的增益G(f)，并通过所述扬声器按预设播放模式进行播放。
优选的，所述步骤S2中，所述总输出声压级 SPL Noise 满足以下公式：
Figure dest_path_image002a
；
其中，所述背景噪声其中一频率 f n 其对应的输出声压级为 SPL n ，表示为 SPL n ( f )，N为所述背景噪声包含的频段数， w( f )是按照ISO-226规定的等响曲线计算的各频率成分的加权系数。
优选的，所述频段数为所述频率成分按照倍频程数进行划分产生，所述倍频程数包括1倍频程、1/3倍频程、1/6倍频程及1/12倍频程。
优选的，所述步骤S2中，所述噪声分析为通过所述处理模块计算所述背景噪声的各个所述频率成分的声压级，按照人耳对各频率的等响度曲线，加权累计后产生的所述总输出声压级 SPL Noise 。
优选的，所述步骤S4中，满足所述预设信噪比为所述总体输出声压级 SPL Final ( f ) 比总输出声压级 SPL Noise 高35dB。
优选的，所述步骤S4中，所述总体输出声压级 SPL Final ( f ) 满足以下公式：
Figure dest_path_image004
；
其中，G( f )为各个所述频率的增益， SPL s ( f )所述音频系统的所述扬声器在1米处的灵敏度与频率关系函数，L为距离所述音频系统至所述目标位置的距离。
优选的，所述音频系统在所述预设播放模式为高保真模式工作时，满足35dB信噪比的条件下，满足以下公式：
Figure dest_path_image006
；
Figure dest_path_image008
；
其中， Target 1 ( f )为高保真模式下的频率-声压级之间的关系函数。
优选的，所述音频系统在所述预设播放模式为高音量模式工作时，满足以下公式：
Figure dest_path_image010
；
Figure dest_path_image012
；
其中， Target 2 ( f )为高音量模式下的频率-声压级之间的关系函数。
优选的，所述步骤S5中，所述功率放大模块根据所述总体输出声压级 SPL Final ( f )自适应调节每个频段的增益G(f)的方式为对不同频率段进行分别调节。
本发明还提供了一种音频系统，所述音频系统应用于显示设备，所述音频系统包括：
麦克风，用于采集其所处环境的背景噪声；
处理模块，用于对所述背景噪声进行噪声分析，并根据分析结果计算所述背景噪声的总输出声压级 SPL Noise ，根据所述分析结果计算所述功率放大模块需要调节的各个所述频段的增益大小，根据目标位置与所述扬声器之间的距离，计算所述目标位置处所需要产生的总体输出声压级 SPL Final ( f ) ，以满足预设信噪比，所述分析结果包括所述背景噪声的频段数N、频率成分以及每一所述频率成分对应的声压级；
功率放大模块，用于根据所述总体输出声压级 SPL Final ( f )自适应调节所个频段的增益，以满足预设信噪比；
扬声器，用于按预设播放模式进行播放播放增益调节后的所述音频；
存储模块，用于存放所述处理模块所述需要的软件代码，并提供所述处理模块运行过程中所需要的静态内存和动态内存；
电源管理模块，用于对所述音频系统的供电管理。
本发明还提供了一种音频系统，该系统包括处理模块和存储模块，所述处理模块用于读取所述存储模块中的程序，执行如上中的任一项所述的音质自适应调节方法中的步骤。
本发明还提供了一种计算机可读存储介质，所述计算机可读存储介质存储有音质自适应调节方法的程序，所述音质自适应调节方法的程序被处理器执行时实现如上中的任一项所述的音质自适应调节方法的步骤。
本发明还提供了一种显示设备，该设备包括如上所述的音频系统。
 有益效果
与相关技术相比，本发明的一种音质自适应调节方法、音频系统、显示设备以及计算机可读存储介质，该方法包括如下步骤：步骤S1、所述音频系统采集其所处环境的背景噪声；步骤S2、所述处理模块对所述背景噪声进行噪声分析，并根据分析结果计算所述背景噪声的总输出声压级 SPL Noise ，所述分析结果包括所述背景噪声的频段数N、频率成分以及每一所述频率成分对应的声压级；步骤S3、所述处理模块根据所述分析结果计算所述功率放大模块需要调节的各个所述频段的增益大小；步骤S4、所述处理模块根据目标位置与所述扬声器之间的距离，计算所述目标位置处所需要产生的总体输出声压级 SPL Final ( f ) ，以满足预设信噪比；步骤S5、所述功率放大模块根据所述总体输出声压级 SPL Final ( f )自适应调节每个频段的增益G(f)，并通过所述扬声器按预设播放模式进行播放。本发明的技术方案通过上述步骤的所述处理模块对所述背景噪声进行噪声分析，并计算出总体输出声压级 SPL Final ( f ) ，以满足预设信噪比，再通过所述功率放大模块自适应调节每个频段的增益G(f)，从而提高了输出音频的信噪比，并使得输出的音频的音质好。
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它的附图，其中：
图1为本发明音质自适应调节方法的流程框图；
图2为本发明的背景噪声的频率-声压级之间的关系图
图3为本发明的音频系统在1米处的灵敏度与频率关系函数；
图4为本发明的音频系统的总体输出声压的频率-声压级之间的关系函数图；
图5为本发明的音频系统的结构框图。
 本发明的实施方式
下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅是本发明的一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其它实施例，都属于本发明保护的范围。
需要说明的是，各实施例之间的技术方案可相互组合，但必须是以本领域普通技术人员能够实现为基础。
请参阅图1所示，本发明提供了一种音质自适应调节方法。该方法运用于音频系统，该音频系统包括扬声器、处理模块和功率放大模块。所述音频系统可以是集成在显示设备的主机内部的电路，也可以是与该主机分离外部独立设置。本实施方式中，所述显示设备为智能电视。
所述音质自适应调节方法包括如下步骤：
步骤S1、所述音频系统采集其所处环境的背景噪声。
步骤S2、所述处理模块对所述背景噪声进行噪声分析，并根据分析结果计算所述背景噪声的总输出声压级 SPL Noise 。
其中， 所述分析结果包括所述背景噪声的频段数、频率成分以及每一所述频率成分对应的声压级。
本步骤S2中，所述噪声分析为通过所述处理模块计算所述背景噪声的各个所述频率成分的声压级，按照人耳对各频率的等响度曲线，加权累计后产生的所述总输出声压级 SPL Noise 。
请参阅图2所示，图2为本发明的背景噪声的频率率-声压级之间的关系图。曲线W1代表为 SPL n ( f )，本步骤S2中，所述总输出声压级 SPL Noise 满足以下公式：
Figure dest_path_image002aa
；
其中，所述背景噪声其中一频率 f n 其对应的输出声压级为 SPL n ，表示为 SPL n ( f )，N为所述背景噪声包含的频段数， w( f )是按照ISO-226规定的等响曲线计算的各频率成分的加权系数。
所述频段数N为所述频率成分按照倍频程数进行划分产生，所述倍频程数包括1倍频程、1/3倍频程、1/6倍频程及1/12倍频程。
步骤S3、所述处理模块根据所述分析结果计算所述功率放大模块需要调节的各个所述频段的增益大小。
步骤S4、所述处理模块根据目标位置与所述扬声器之间的距离，计算所述目标位置处所需要产生的总体输出声压级 SPL Final ( f ) ，以满足预设信噪比。
请参阅图3所示，图3为本发明的音频系统在1米处的灵敏度与频率关系函数。曲线W2代表为 SPL s ( f )。这是由所述音频系统的扬声器元器件本身的声学性能决定的关系曲线。
本步骤S4中，所述总体输出声压级 SPL Final ( f ) 满足以下公式：
Figure dest_path_image004a
；
其中，G( f )为各个所述频率的增益， SPL s ( f )所述音频系统的所述扬声器在1米处的灵敏度与频率关系函数，L为距离所述音频系统至所述目标位置的距离。由此可以看出，当确定了 SPL Final ( f )以后，所述音频系统就可以自适应的调节每个所述频率的增益G( f )。需要说明的是，参数L优选是由智能电视厂家针对每款产品给出相应建议。
所述步骤S4中，满足所述预设信噪比为所述总体输出声压级 SPL Final ( f ) 比总输出声压级 SPL Noise 高35dB。该设置有利于智能电视在所规定的观影距离下保证足够的信噪比。
请参阅图4所示，图4为本发明的音频系统的总体输出声压的频率-声压级之间的关系函数图。本实施方式中，所述智能电视在参数L处产生的所述总体输出声压级的两种 SPL Final ( f )既定趋势。其中，W3为 Target 2 ( f ) ，W4为 Target 1 ( f )。为了更好说明本发明的应用所述总体输出声压级来调节每个所述频率的增益G( f )的效果，我们从所述音频系统在高保真模式和高音量模式进行分别说明：
所述音频系统在所述预设播放模式为高保真模式工作时，满足35dB信噪比的条件下，满足以下公式：
Figure dest_path_image006a
；
Figure dest_path_image008a
；
其中， Target 1 ( f )为高保真模式下的频率-声压级之间的关系函数。
可以看出，在高保真模式下，要求所述智能电视的输出声压级在高低频段均保持一致，使整个曲线在全频段具有良好的平衡性。其中，高保真模式的所述高保真输出是在不超过所述音频系统最大输出能力和所述音频系统的扬声器最大承受能力的情况下，调节所述音频系统的功率放大器的高低频段的增益，使智能电视的声音频谱在高低频段达到最平衡的状态。
所述音频系统在所述预设播放模式为高音量模式工作时，满足以下公式：
Figure dest_path_image010a
；
Figure dest_path_image012a
；
其中， Target 2 ( f )为高音量模式下的频率-声压级之间的关系函数。
由此可见，当背景噪声不大时，计算出来的 SPL Final ( f )在整个所述音频系统的最大输出范围和所述音频系统的扬声器系统的最大承受范围内，当背景噪声逐渐变大时，计算出的 SPL Final ( f )也会逐渐增大至超出所述音频系统的最大输出范围或者超出所述扬声器系统的最大承受能力，这种情况，低频段的效应最为明显。因此在所述背景噪声较大的情况下，在高音量的模式下，由于人耳对高频声音更加敏感，因此对低频段并不做提升，主要提升高频段的输出声压级。高音量模式的高音量输出，是在不超过所述音频系统最大输出能力和所述音频系统的扬声器最大承受能力的情况下，抑制所述音频系统的所述功率放大模块在低频段的增益，提高所述音频系统的所述功率放大模块在高频段的增益，允许智能电视的声音频谱在高低频段出现一定的不平衡。
步骤S5、所述功率放大模块根据所述总体输出声压级 SPL Final ( f )自适应调节每个频段的增益G(f)，并通过所述扬声器按预设播放模式进行播放。
本步骤S5中，所述功率放大模块根据所述总体输出声压级 SPL Final ( f )自适应调节每个频段的增益G(f)的方式为对不同频率段进行分别调节。
综合上述步骤，所述音频系统通过所述处理模块对所述背景噪声进行噪声分析，并计算出总体输出声压级 SPL Final ( f ) ，以满足预设信噪比，再通过所述功率放大模块自适应调节每个频段的增益G(f)，从而提高了输出音频的信噪比，并使得输出的音频的音质好。
本发明还提供了一种音频系统，该系统包括处理模块和存储模块，所述处理模块用于读取所述存储模块中的程序，执行所述音质自适应调节方法中的步骤。
本发明还提供了一种计算机可读存储介质，所述计算机可读存储介质存储有音质自适应调节方法的程序，所述音质自适应调节方法的程序被处理器执行时实现所述音质自适应调节方法的步骤。
请参阅图5所示，本发明还提供了一种音频系统100，所述音频系统应用于显示设备。所述音频系统100可以是集成在显示设备的主机内部的电路，也可以是与该主机分离外部独立设置。本实施方式中，所述显示设备为智能电视。
本实施方式中，所述音频系统100是与智能电视机的主体集成在一起的。当然，不限于此，所述音频系统100也可以是与智能电视机主体分离开，独立形成一套外置设备。
所述音频系统100包括麦克风1、处理模块2、功率放大模块3、扬声器4、存储模块5及电源管理模块6。
需要指出的是，所述麦克风1、所述处理模块2、所述功率放大模块3、所述扬声器4、所述存储模块5及所述电源管理模块6均为本技术领域常用的元器件、电路及模块，本领域的技术人员可以根据自己实际需要选择不同的规格和型号，在此不做详细描述。
所述麦克风1用于采集其所处环境的背景噪声。
本实施方式中，所述麦克风1位于智能电视的顶部的中央位置，所述扬声器4位于智能电视的底部的两侧。所述麦克风1包括两个，两个所述麦克风1 间隔且隔离，具体的，两个所述麦克风1在实际设计上尽量远离以防止整个音频系统出现啸叫。
所述处理模块2用于对所述背景噪声进行噪声分析，并根据分析结果计算所述背景噪声的总输出声压级 SPL Noise ，根据所述分析结果计算所述功率放大模块3需要调节的各个所述频段的增益大小，根据目标位置与所述扬声器之间的距离，计算所述目标位置处所需要产生的总体输出声压级 SPL Final ( f ) ，以满足预设信噪比。所述分析结果包括所述背景噪声的频段数N、频率成分以及每一所述频率成分对应的声压级。
所述功率放大模块3用于根据所述总体输出声压级 SPL Final ( f )自适应调节所个频段的增益，以满足预设信噪比。
所述扬声器4用于按预设播放模式进行播放播放增益调节后的所述音频。所述扬声器4包括多个。本实施方式中，所述扬声器4包括三个，一个所述扬声器4作为中置音源设置于所述显示设备的中间，另两个所述扬声器4分别设置于所述显示设备的两侧作为左音源和右音源。当然，所述扬声器4也可以为其他数量，例如5个、6个、12个等都可以。
所述存储模块5用于存放所述处理模块2所述需要的软件代码，并提供所述处理模块2运行过程中所需要的静态内存和动态内存。
所述电源管理模块6用于对所述音频系统100的供电管理。
本发明还提供了一种显示设备，该设备包括壳体和所述音频系统100，所述音频系统可安装于所述壳体内部或外表面。
与相关技术相比，本发明的一种音质自适应调节方法、音频系统、显示设备以及计算机可读存储介质，该方法包括如下步骤：步骤S1、所述音频系统采集其所处环境的背景噪声；步骤S2、所述处理模块对所述背景噪声进行噪声分析，并根据分析结果计算所述背景噪声的总输出声压级 SPL Noise ，所述分析结果包括所述背景噪声的频段数N、频率成分以及每一所述频率成分对应的声压级；步骤S3、所述处理模块根据所述分析结果计算所述功率放大模块需要调节的各个所述频段的增益大小；步骤S4、所述处理模块根据目标位置与所述扬声器之间的距离，计算所述目标位置处所需要产生的总体输出声压级 SPL Final ( f ) ，以满足预设信噪比；步骤S5、所述功率放大模块根据所述总体输出声压级 SPL Final ( f )自适应调节每个频段的增益G(f)，并通过所述扬声器按预设播放模式进行播放。本发明的技术方案通过上述步骤的所述处理模块对所述背景噪声进行噪声分析，并计算出总体输出声压级 SPL Final ( f ) ，以满足预设信噪比，再通过所述功率放大模块自适应调节每个频段的增益G(f)，从而提高了输出音频的信噪比，并使得输出的音频的音质好。
以上所述的仅是本发明的实施方式，在此应当指出，对于本领域的普通技术人员来说，在不脱离本发明创造构思的前提下，还可以做出改进，但这些均属于本发明的保护范围。

Claims (13)

  1. 一种音质自适应调节方法，该方法运用于音频系统，该音频系统包括扬声器、处理模块和功率放大模块，其特征在于，该方法包括如下步骤：
    步骤S1、所述音频系统采集其所处环境的背景噪声；
    步骤S2、所述处理模块对所述背景噪声进行噪声分析，并根据分析结果计算所述背景噪声的总输出声压级 SPL Noise ，所述分析结果包括所述背景噪声的频段数、频率成分以及每一所述频率成分对应的声压级；
    步骤S3、所述处理模块根据所述分析结果计算所述功率放大模块需要调节的各个所述频段的增益大小；
    步骤S4、所述处理模块根据目标位置与所述扬声器之间的距离，计算所述目标位置处所需要产生的总体输出声压级 SPL Final( f ) ，以满足预设信噪比；
    步骤S5、所述功率放大模块根据所述总体输出声压级 SPL Final( f ) 自适应调节每个频段的增益G(f)，并通过所述扬声器按预设播放模式进行播放。
  2. 根据权利要求1所述的音质自适应调节方法，其特征在于，所述步骤S2中，所述总输出声压级 SPL Noise 满足以下公式：
    Figure 550961dest_path_image002
    ；
    其中，所述背景噪声其中一频率 f n 其对应的输出声压级为 SPL n ，表示为 SPL n( f ) ，N为所述背景噪声包含的频段数， w( f )是按照ISO-226规定的等响曲线计算的各频率成分的加权系数。
  3. 根据权利要求2所述的音质自适应调节方法，其特征在于，所述频段数为所述频率成分按照倍频程数进行划分产生，所述倍频程数包括1倍频程、1/3倍频程、1/6倍频程及1/12倍频程。
  4. 根据权利要求1所述的音质自适应调节方法，其特征在于，所述步骤S2中，所述噪声分析为通过所述处理模块计算所述背景噪声的各个所述频率成分的声压级，按照人耳对各频率的等响度曲线，加权累计后产生的所述总输出声压级 SPL Noise 。
  5. 根据权利要求1所述的音质自适应调节方法，其特征在于，所述步骤S4中，满足所述预设信噪比为所述总体输出声压级 SPL Final( f ) 比总输出声压级 SPL Noise 高35dB。
  6. 根据权利要求1所述的音质自适应调节方法，其特征在于，所述步骤S4中，所述总体输出声压级 SPL Final ( f ) 满足以下公式：
    Figure 999260dest_path_image004
    ；
    其中，G( f )为各个所述频率的增益， SPL s ( f )所述音频系统的所述扬声器在1米处的灵敏度与频率关系函数，L为距离所述音频系统至所述目标位置的距离。
  7. 根据权利要求6所述的音质自适应调节方法，其特征在于，所述音频系统在所述预设播放模式为高保真模式工作时，满足35dB信噪比的条件下，满足以下公式：
    Figure 310155dest_path_image006
    ；
    Figure 970944dest_path_image008
    ；
    其中， Target 1 ( f )为高保真模式下的频率-声压级之间的关系函数。
  8. 根据权利要求6所述的音质自适应调节方法，其特征在于，所述音频系统在所述预设播放模式为高音量模式工作时，满足以下公式：
    Figure 50895dest_path_image010
    ；
    Figure 913504dest_path_image012
    ；
    其中， Target 2 ( f )为高音量模式下的频率-声压级之间的关系函数。
  9. 根据权利要求1所述的音质自适应调节方法，其特征在于，所述步骤S5中，所述功率放大模块根据所述总体输出声压级 SPL Final( f ) 自适应调节每个频段的增益G(f)的方式为对不同频率段进行分别调节。
  10. 一种音频系统，所述音频系统应用于显示设备，其特征在于，所述音频系统包括：
    麦克风，用于采集其所处环境的背景噪声；
    处理模块，用于对所述背景噪声进行噪声分析，并根据分析结果计算所述背景噪声的总输出声压级 SPL Noise ，根据所述分析结果计算所述功率放大模块需要调节的各个所述频段的增益大小，根据目标位置与所述扬声器之间的距离，计算所述目标位置处所需要产生的总体输出声压级 SPL Final( f ) ，以满足预设信噪比，所述分析结果包括所述背景噪声的频段数N、频率成分以及每一所述频率成分对应的声压级；
    功率放大模块，用于根据所述总体输出声压级 SPL Final( f ) 自适应调节所个频段的增益，以满足预设信噪比；
    扬声器，用于按预设播放模式进行播放播放增益调节后的所述音频；
    存储模块，用于存放所述处理模块所述需要的软件代码，并提供所述处理模块运行过程中所需要的静态内存和动态内存；
    电源管理模块，用于对所述音频系统的供电管理。
  11. 一种音频系统，其特征在于，该系统包括处理模块和存储模块，所述处理模块用于读取所述存储模块中的程序，执行如权利要求1至9中的任一项所述的音质自适应调节方法中的步骤。
  12. 一种计算机可读存储介质，其特征在于，所述计算机可读存储介质存储有音质自适应调节方法的程序，所述音质自适应调节方法的程序被处理器执行时实现如权利要求1至9中的任一项所述的音质自适应调节方法的步骤。
  13. 一种显示设备，其特征在于，该设备包括如权利要求11所述的音频系统。
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