WO2015127832A1 - 一种实现高保真音乐播放的移动终端 - Google Patents

一种实现高保真音乐播放的移动终端 Download PDF

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WO2015127832A1
WO2015127832A1 PCT/CN2015/070374 CN2015070374W WO2015127832A1 WO 2015127832 A1 WO2015127832 A1 WO 2015127832A1 CN 2015070374 W CN2015070374 W CN 2015070374W WO 2015127832 A1 WO2015127832 A1 WO 2015127832A1
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digital
processor
mobile terminal
audio signal
analog
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PCT/CN2015/070374
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English (en)
French (fr)
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吴晓光
于猛
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维沃移动通信有限公司
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    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/10—Digital recording or reproducing
    • G11B20/10009—Improvement or modification of read or write signals
    • G11B20/10037—A/D conversion, D/A conversion, sampling, slicing and digital quantisation or adjusting parameters thereof

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  • the present invention relates to the field of mobile terminal technologies, and in particular, to a mobile terminal that implements high fidelity music playback.
  • the music source file is stored in the optical disc, and the high-power audio is driven by the power amplifier after decoding. Because such a device is large in size, it is usually cumbersome and has poor portability;
  • the controller controls the sound source to be transmitted to the decoder for decoding, and then the headphone amplifier is amplified to drive the earphone, and the human-computer interaction interface is simple, which makes the operation complicated, and at the same time, the type of playback The sound quality is poor and the operation response is slow;
  • High-end music playback equipment such as enthusiasts, which are affected by technical limitations and raw material costs, are often expensive, consumers with limited funds cannot match, and the audience is small.
  • a mobile terminal for realizing high fidelity music playback comprising a processor, a memory and a power amplifying device, characterized in that it further comprises a digital to analog converter and a clock generating and distributing device, the processor comprising An application processor or a digital signal processor that reads the memory a music source file and audio decoding the music source file to obtain a digital audio signal, the digital-to-analog converter receiving the digital audio signal, and performing digital-to-analog conversion to obtain an analog audio signal, the power amplifying device is configured to perform the simulation The audio signal is amplified and output; the clock generation and distribution device provides a synchronized clock for the processor and the digital to analog converter.
  • processor SRC and system clock jitter provide clock through clock generation and distribution device, processor and digital-to-analog converter as slave devices, which can output various sampling rates through internal partial frequency and multi-frequency operation.
  • the clock frequency makes the transmission between the processor and the digital-to-analog converter without any SRC processing when playing music, ensuring high-quality music performance;
  • the processor further includes an interface conversion device, the application processor or the digital signal processor converting the music source file into a PCM code stream, and the interface conversion device converting the PCM code stream into a digital to analog converter receivable The data format of the digital audio signal.
  • the interface conversion device described above converts the PCM code stream into a data format of a digital audio signal including I 2 S.
  • the mobile terminal further includes a switch
  • the processor further includes a built-in codec and an amplifier
  • the PCM code stream can be converted by a interface conversion device, and the digital-to-analog converter performs digital-to-analog conversion and The power amplifying device is amplified and output, or the PCM code stream can pass through
  • the built-in codec of the processor performs digital-to-analog conversion and is directly output after being amplified by an amplifier, and the switch is used to select an output mode of the audio signal.
  • the output mode of the digital-to-analog conversion by the digital-to-analog converter is a high-fidelity music playing mode
  • the output mode of the built-in codec is a normal music playing mode
  • the high-fidelity music playing mode has a good sound quality.
  • the characteristics of large power consumption, the ordinary music playback mode has the characteristics of poor sound quality and low power consumption, and seamless switching between two different play modes through the switch, which can meet the music playing needs of different people in different occasions.
  • the clock generation and distribution device described above includes a crystal oscillator for providing a clock reference and a master device for providing a synchronous clock to the processor and the digital to analog converter.
  • the mobile terminal further includes a power supply, and the power supply includes a DC filter and a low dropout linear regulator.
  • the power supply powers each module of the mobile terminal.
  • FIG. 1 is a simplified structural block diagram of a mobile terminal for implementing high fidelity music playback according to the present invention
  • FIG. 2 is a structural block diagram of a mobile terminal for realizing high fidelity music playing according to the present invention.
  • a mobile terminal for realizing high fidelity music playback includes a processor 3, a memory 2 and a power amplifying device 7, which further includes a digital to analog converter 6 and a clock generating device.
  • the processor 3 includes an application processor or a digital signal processor, the processor 3 reads a music source file in the memory 2 and performs audio decoding on the music source file to obtain a digital audio signal,
  • the digital-to-analog converter 6 receives the digital audio signal and performs digital-to-analog conversion to obtain an analog audio signal
  • the power amplifying device 7 is configured to amplify and output the analog audio signal;
  • the clock generating and distributing device is a processor 3 and digital to analog converter 6 provide a synchronous clock.
  • the analog audio signal is amplified by the power amplifying device and output to the earphone interface or the speaker of the mobile terminal, and the user can enjoy the music by wearing the earphone or directly using the speaker.
  • the processor 3 further includes an interface conversion device, the application processor or digital signal processor converts the music source file into a PCM code stream, and the interface conversion device converts the PCM code stream into a digital-to-analog converter 6 to receive The data format of the digital audio signal.
  • the interface conversion device converts the PCM code stream into a data format of a digital audio signal including I 2 S.
  • the mobile terminal further includes a changeover switch 8.
  • the processor 3 further includes a built-in codec and an amplifier.
  • the PCM code stream can be converted by a interface conversion device, and the digital-to-analog converter performs digital-to-analog conversion. After being amplified by the power amplifying device, the PCM code stream can be digital-analog converted by the codec built in the processor 3 and directly amplified by the amplifier, and the switch 7 is used to select the output mode of the audio signal.
  • the output mode of the digital-to-analog conversion by the digital-to-analog converter 6 is a high-fidelity music playing mode.
  • the output mode of the built-in codec is a normal music playing mode, and the high-fidelity music playing mode has a good sound quality.
  • the characteristics of large power consumption, the ordinary music playback mode has the characteristics of poor sound quality and low power consumption.
  • the switch can realize seamless switching between two different play modes, which can meet the music playing needs of different people in different occasions.
  • the clock generation and distribution device includes a crystal oscillator 5 for providing a clock reference and a master device 4 for providing a synchronous clock to the processor and the digital to analog converter.
  • the master device 4 can be any device capable of outputting a clock, including but not limited to an ADC, a PLL, a FLL, an FPGA, and the like.
  • the digital to analog converter 6 may be ES9018, CS4398, or the like.
  • the power amplifying device 7 may be an operational amplifier with a large output current (such as an OPA2604, an AD8260, etc.), a professional headphone power amplifier (such as a Maxim MAX97220), or a combination of the two.
  • a large output current such as an OPA2604, an AD8260, etc.
  • a professional headphone power amplifier such as a Maxim MAX97220
  • the mobile terminal further includes a power supply 1 including a DC chopper and a low dropout linear regulator.
  • the power supply 1 supplies power to each module of the mobile terminal.
  • the digital-to-analog converter, the power amplifying device, and the master device are not limited to the type or model disclosed in the specific embodiment, and the data format of the digital audio signal receivable by the digital-to-analog converter is not limited to I 2 S or the like.
  • the specific embodiments of the present invention are not limited to the above examples without departing from the inventive concept.
  • the specific embodiments may also be There are a number of deductions or optimizations that should be considered as being within the scope of the invention.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Telephone Function (AREA)
  • Amplifiers (AREA)

Abstract

本发明涉及移动终端技术领域，尤其涉及一种实现高保真音乐播放的移动终端，它包括一处理器、一存储器和一功率放大装置，它还包括一数模转换器和一时钟产生与分配装置，所述处理器包括一应用处理器或一数字信号处理器，所述处理器读取存储器中的音乐源文件并对音乐源文件进行音频解码得到数字音频信号，所述数模转换器接收所述数字音频信号，并进行数模转换以得到模拟音频信号，功率放大装置用于对所述模拟音频信号进行放大并输出；所述时钟产生与分配装置为处理器和数模转换器提供同步时钟。它具有高保真的音乐播放音质，成本低廉。

Description

一种实现高保真音乐播放的移动终端 技术领域：
本发明涉及移动终端技术领域，尤其涉及一种实现高保真音乐播放的移动终端。
背景技术：
随着现代生活节奏的加快以及日常事务的繁琐，现代用户的压力也逐渐增大，音乐能将用户从繁忙的工作、学习中暂时抽离出来，使身心得到舒缓，成为一种减压的良药，然而现有的音乐播放设备有着诸多不足：
1.如CD唱机、蓝光播放器等，其音乐源文件存储在光盘中，解码后通过功率放大器驱动大功率音响工作，由于此类设备体型较大，通常较为笨重，便携性较差；
2.如普通MP3播放器，通过闪存存储器存储音源，控制器控制将音源传输到解码器进行解码，后经耳机放大器放大后驱动耳机，人机交互界面简单，使得操作复杂，同时，该类播放器音质较差，操作响应慢；
3.如发烧级的高端音乐播放设备，受技术限制及原材料成本影响，往往价格高昂，资金有限的消费者无法企及，受众面小。
发明内容：
本发明的目的在于提供了一种实现高保真音乐播放的移动终端。它具有高保真的音乐播放音质，成本低廉。
本发明所述的一种实现高保真音乐播放的移动终端的技术方案是这样实现的：
一种实现高保真音乐播放的移动终端，它包括一处理器、一存储器和一功率放大装置，其特征在于：它还包括一数模转换器和一时钟产生与分配装置，所述处理器包括一应用处理器或一数字信号处理器，所述处理器读取存储器中 的音乐源文件并对音乐源文件进行音频解码得到数字音频信号，所述数模转换器接收所述数字音频信号，并进行数模转换以得到模拟音频信号，功率放大装置用于对所述模拟音频信号进行放大并输出；所述时钟产生与分配装置为处理器和数模转换器提供同步时钟。
本发明所述的一种实现高保真音乐播放的移动终端与现有技术相比具有如下优点：
1.将高保真音乐系统集成到移动终端内部，在满足音乐播放系统小型化、提高其便携性的同时，增强了移动终端的音质效果，提升了用户使用体验，降低了高保真播放设备的成本；
2.解决处理器的SRC及系统时钟抖动的问题，通过时钟产生与分配装置提供时钟，处理器及数模转换器作为从设备，可通过内部分频、倍频操作输出合适各种采样率的时钟频率，使得播放音乐时，处理器和数模转换器之间的传输不需经过任何SRC处理，保证高品质的音乐性能；
3.随着移动终端的迅猛发展，各种智操作系统的移动终端的操作便利性及智能化高于现有的高保真音乐播放设备，将高保真系统与移动终端结合，通过丰富的功能面板来实现对音乐播放的操作，增强了高保真系统的人性化界面，提升了其易用性。
上述所述处理器还包括一接口转换装置，所述应用处理器或数字信号处理器将音乐源文件转换为PCM码流，所述接口转换装置将PCM码流转换为数模转换器可接收的数字音频信号的数据格式。
上述所述接口转换装置将PCM码流转换为包括I2S在内的数字音频信号的数据格式。
上述所述移动终端还包括一转换开关，处理器还包括内置的一编译码器和一放大器，所述PCM码流可通过接口转换装置进行数据格式转换、数模转换器进行数模转换并经功率放大装置放大后输出，或所述PCM码流可通过处 理器内置的编译码器进行数模转换并经放大器放大后直接输出，转换开关用于选择音频信号的输出方式。前述所述通过数模转换器进行数模转换的输出方式为高保真音乐播放模式，后述所述通过内置的编译码器的输出方式为普通音乐播放模式，高保真音乐播放模式具有音质好、功耗大的特点，普通音乐播放模式具有音质稍差、功耗较小的特点，通过转换开关实现两种不同播放模式之间的无缝切换，可满足不同人群在不同场合的音乐播放需求。
上述所述时钟产生与分配装置包括一用于提供时钟参考的晶振以及一用于对处理器和数模转换器提供同步时钟的主设备。
上述所述移动终端还包括一供电电源，所述供电电源包括一直流斩波器和一低压差线性稳压器。所述供电电源为移动终端的各模块供电。
附图说明：
下面结合附图对本发明作详细的说明：
图1为本发明所述的一种实现高保真音乐播放的移动终端的简化结构框图；
图2为本发明所述的一种实现高保真音乐播放的移动终端的结构框图。
具体实施方式：
如图1和图2所示，一种实现高保真音乐播放的移动终端，它包括一处理器3、一存储器2和一功率放大装置7，它还包括一数模转换器6和一时钟产生与分配装置，所述处理器3包括一应用处理器或一数字信号处理器，所述处理器3读取存储器中2的音乐源文件并对音乐源文件进行音频解码得到数字音频信号，所述数模转换器6接收所述数字音频信号，并进行数模转换以得到模拟音频信号，功率放大装置7用于对所述模拟音频信号进行放大并输出；所述时钟产生与分配装置为处理器3和数模转换器6提供同步时钟。
所述模拟音频信号经功率放大装置放大后可输出至移动终端的耳机接口或扬声器，用户可通过佩戴耳机或直接使用扬声器欣赏音乐。
所述处理器3还包括一接口转换装置，所述应用处理器或数字信号处理器将音乐源文件转换为PCM码流，所述接口转换装置将PCM码流转换为数模转换器6可接收的数字音频信号的数据格式。
所述接口转换装置将PCM码流转换为包括I2S在内的数字音频信号的数据格式。
所述移动终端还包括一转换开关8，处理器3还包括内置的一编译码器和一放大器，所述PCM码流可通过接口转换装置进行数据格式转换、数模转换器进行数模转换并经功率放大装置放大后输出，或所述PCM码流可通过处理器3内置的编译码器进行数模转换并经放大器放大后直接输出，转换开关7用于选择音频信号的输出方式。前述所述通过数模转换器6进行数模转换的输出方式为高保真音乐播放模式，后述所述通过内置的编译码器的输出方式为普通音乐播放模式，高保真音乐播放模式具有音质好、功耗大的特点，普通音乐播放模式具有音质稍差、功耗较小的特点，通过转换开关实现两种不同播放模式之间的无缝切换，可满足不同人群在不同场合的音乐播放需求。
所述时钟产生与分配装置包括一用于提供时钟参考的晶振5以及一用于对处理器和数模转换器提供同步时钟的主设备4。所述主设备4可以是能够输出时钟的任何器件，包括但不限于ADC、PLL、FLL、FPGA等。
所述数模转换器6可以是ES9018、CS4398等。
所述功率放大装置7可以是输出电流较大的运算放大器(如OPA2604、AD8260等)、专业耳机功率放大器(如美信MAX97220)或二者的组合。
所述移动终端还包括一供电电源1，供电电源1包括一直流斩波器和一低压差线性稳压器。所述供电电源1为移动终端的各模块供电。
以上内容是结合具体实施例对本发明的进一步详细说明，不能认定为具体的实施方案只局限于这些说明。如：所述数模转换器、功率放大装置、主设备不仅限于具体实施例公开的类型或型号、所述数模转换器可接收的数字音频信号的 数据格式不仅限于I2S等。对于本发明所属技术领域的技术人员来说，在不脱离本发明构思的前提下，本发明的具体实施方式不拘泥于上述实例，在本发明的具体实施过程中，具体实施方式还可以做出若干推演或优化，这些推演或优化都应当视为属于本发明的保护范围。

Claims (6)

  1. 一种实现高保真音乐播放的移动终端，它包括一处理器、一存储器和一功率放大装置，其特征在于：它还包括一数模转换器和一时钟产生与分配装置，所述处理器包括一应用处理器或一数字信号处理器，所述处理器读取存储器中的音乐源文件并对音乐源文件进行音频解码得到数字音频信号，所述数模转换器接收所述数字音频信号，并进行数模转换以得到模拟音频信号，功率放大装置用于对所述模拟音频信号进行放大并输出；所述时钟产生与分配装置为处理器和数模转换器提供同步时钟。
  2. 根据权利要求1所述的一种实现高保真音乐播放的移动终端，其特征在于：所述处理器还包括一接口转换装置，所述应用处理器或数字信号处理器将音乐源文件转换为PCM码流，所述接口转换装置将PCM码流转换为数模转换器可接收的数字音频信号的数据格式。
  3. 根据权利要求2所述的一种实现高保真音乐播放的移动终端，其特征在于：所述接口转换装置将PCM码流转换为包括I2S在内的数字音频信号的数据格式。
  4. 根据权利要求2或3所述的一种实现高保真音乐播放的移动终端，其特征在于：所述移动终端还包括一转换开关，处理器还包括内置的一编译码器和一放大器，所述PCM码流可通过接口转换装置进行数据格式转换、数模转换器进行数模转换并经功率放大装置放大后输出，或所述PCM码流可通过处理器内置的编译码器进行数模转换并经放大器放大后直接输出，转换开关用于选择音频信号的输出方式。
  5. 根据权利要求4所述的一种实现高保真音乐播放的移动终端，其特征在于：所述时钟产生与分配装置包括一用于提供时钟参考的晶振以及一用于对处理器和数模转换器提供同步时钟的主设备。
  6. 根据权利要求4所述的一种实现高保真音乐播放的移动终端，其特征在 于：所述移动终端还包括一供电电源，所述供电电源包括一直流斩波器和一低压差线性稳压器。
PCT/CN2015/070374 2014-02-28 2015-01-08 一种实现高保真音乐播放的移动终端 WO2015127832A1 (zh)

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