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Implementation of an object audio system based on MPEG-4 audio lossless coding on DSP

机译:基于MPEG-4音频无损编码的目标音频系统在DSP上的实现

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In this paper, we propose an object audio system on digital signal processor (DSP) that consists of MPEG-4 audio lossless coding (ALS) to provide high-quality audio. The complexity reduction in the designed object audio system is very critical issue because the system requires several MPEG-4 ALS decoders, as many as the number of objects. A method to efficiently use internal memory on DSP is suggested to overcome the high-complexity situation that happens with the use of external memory. A low-complexity finite impulse response (FIR) filter is also proposed because the short-term prediction filter in the MPEG-4 ALS decoder has the highest complexity in MPEG-4 ALS decoder blocks. A method for efficient use of internal memory is designed so that the critical data of MPEG-4 ALS decoders use internal memory as much as the size of the data for a decoder, and the internal memory is shared with the MPEG-4 ALS decoders. The proposed FIR filter reduces the complexity of the short-term prediction filter by 25% compared to direct convolution. A proposed method for an object audio system is evaluated on DSP; it consists of 12 objects. The proposed audio system has a reduction of complexity by 83% with the application of the two proposed methods, and the audio system operates in real time on DSP. This means that high-quality object audio can be serviced for multimedia products.
机译:在本文中,我们提出了一种在数字信号处理器(DSP)上的目标音频系统,该系统由MPEG-4音频无损编码(ALS)组成,可提供高质量的音频。设计的目标音频系统的复杂性降低是非常关键的问题,因为该系统需要几个MPEG-4 ALS解码器,数量与目标数量一样多。为了克服使用外部存储器时发生的高复杂性情况,建议了一种在DSP上有效使用内部存储器的方法。还提出了一种低复杂度的有限脉冲响应(FIR)滤波器,因为MPEG-4 ALS解码器中的短期预测滤波器在MPEG-4 ALS解码器块中具有最高的复杂性。设计一种有效利用内部存储器的方法,以使MPEG-4 ALS解码器的关键数据使用内部存储器的大小与解码器的数据大小相同,并且内部存储器与MPEG-4 ALS解码器共享。与直接卷积相比,拟议的FIR滤波器将短期预测滤波器的复杂度降低了25%。在DSP上评估了一种目标音频系统的方法。它由12个对象组成。所提出的音频系统通过两种所提出的方法的应用使复杂度降低了83%,并且该音频系统在DSP上实时运行。这意味着可以为多媒体产品提供高质量的目标音频。

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