Method and device for transmitting audio data

A technology for audio data and audio equipment, applied in the field of IIS-based audio data transmission methods and equipment, can solve problems such as complex caching, and achieve the effect of saving SRAM
CN101446932AInactive Publication Date: 2009-06-03VIMICRO CORP
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Patent Information

Authority / Receiving Office
CN Β· China
Current Assignee / Owner
VIMICRO CORP
Publication Date
2009-06-03
Estimated Expiration
Not applicable Β· inactive patent

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Abstract

The invention provides a method and a device for transmitting audio data, wherein, the method enables an audio device to conduct the audio transmission by utilizing a pre-applied cache, and the cache is divided into at least two spaces. The method comprises a data prewriting step, a data writing step and a data reading step, wherein, during data pre-writing step, the audio data coming from a source device is prewritten into the cache; during the data writing step, the residual audio data is written in to a first free space of the two spaces; during the data reading step, the written data is read from a second space according to the written sequence of the audio data, and sent to a target device. In the invention, only one cache is applied and divided into a plurality of spaces, so that the flexibility of data processing is enhanced; and an FIFO memory which is originally arranged on an SRAM of an external device is arranged in a DMA, so that the SRAM of an internal chip of the external device is saved.
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Description

technical field

[0001] The invention relates to the audio field, in particular to an audio data transmission method and device based on IIS (Inter-IC Sound Bus, integrated circuit internal audio bus). Background technique

[0002] In order to solve the problem of audio delay, a double buffer design is adopted in the prior art, and data is transmitted between the memory and the audio device through the double buffer. refer to figure 1 , figure 1 Schematic diagram of the existing audio system. The SRAM (Static Random Access Memory, static random access memory) of the audio device includes a FIFO (First In First Out) memory, and all audio devices share a DMA (Direct Memory Access, memory direct access). DMA refers to a high-speed data transfer operation that allows direct reading and writing of data between external devices and memory. When DMA processes audio files from one buffer area, CPU (Central Processing Unit, central processing unit) can process another buffer area....

Claims

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