Sound reproducing device

Abstract

A sound reproducing device comprises a decoding unit (1200) for decoding an audio signal bit stream inputted from outside and generating a decoded PCM signal, a control unit (1100) for specifying a reproduction condition according to reproduction instruction information acquired from outside and decoding information acquired from the decoding unit (1200) and issuing a reproduction instruction, and an additive audio adding unit (1500) for processing additive audio data inputted from outside, adding the processed additive audio data to the decoded PCM signal, and outputting the sum signal as a PCM output signal. The additive audio adding unit (1500) has an additive audio crating section (1510) for processing the additive audio data so that the additive audio data can be added to the decoded PCM signal and outputting the processed additive audio data as an additive audio PCM signal, and an adder (1520) for mixing the additive audio PCM signal and the decoded PCM signal. The additive audio generating section (1510) is composed of a plurality of processing means (1511, 1512) corresponding to the trade-off between the magnitude of the load of the processing computational complexity and the sound characteristic of the processing result. The control unit (1100) specifies one of the processing means (1511, 1512) according to the reproduction instruction information and decoding information. The additive audio generating section (1510) processes the additive audio data by using the specified processing means.

Description

technical field [0001] The present invention relates to a digital signal processing technology, in particular to decoding an externally input sound signal bit stream to generate a decoded PCM signal, and then processing additional sound data input from outside to add to the above-mentioned decoded PCM signal Calculate and output to an external audio reproduction device. Background technique [0002] In recent years, due to the popularization and technical progress of various digital media reproduction devices such as digital televisions and optical disc devices, various functions have been mounted on media reproduction devices involving digital processing. As one of the functions in such a background, for example, a function of mixing and outputting an external sound such as a guide sound or a warning sound with a digital TV broadcast sound or an optical disc reproduction sound may be provided. Furthermore, in the case of performing such external sound mixing processing on ...

AI Technical Summary

Problems solved by technology

[0017] However, when performing these processes, since the properties of the stream to be decoded, the required audio processing functions, and the processing of additional audio data, etc. are included, when the above processes are implemented on the same device, The processing capability required varies depending on the attributes of the stream or playback conditions

First, when the sampling frequency for reproducing PCM is increased due to the properties of the bit stream or the reproduction request for high-quality sound processing, the processing amount of the processing of the external sound may be increased accordingly, and the processing of the entire audio reproduction device may be overwhelmed. Amount of flaws

[0018] Moreover, in order to avoid this, it is necessary to increase the sampling frequency of the reproduced PCM, but in this case, the sound quality of the decoded PCM may be deteriorated or the high-quality sound processing required from the outside may not be realized.

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