PCM time slot interchange method capable of directly carrying out voice interchange with voice codec

Abstract

The invention relates to a PCM time slot interchange method capable of directly carrying out voice interchange with a voice codec, which comprises the following steps of: taking equipment with a PCM interface as main equipment and a PCM time slot interchange controller module as the auxiliary equipment of PCM; meanwhile, taking the PCM time slot interchange controller module as an IIS main equipment interface and a voice encoder / decoder as an IIS auxiliary equipment interface; designing a time slot switch for a VHDL code, controlling concrete time slots ascending and descending from the PCM by the time slot switch, finishing the reception and the maintenance of the data of the concrete time slots of the PCM by a PCM time slot interchange controller module, forming a novel IIS bus timing and transmitting the novel IIS bus timing to the voice encoder / decoder; and meanwhile, transmitting voice data transmitted from the voice encoder / decoder to the ascending concrete time slots after carrying out frequency-conversion processing on the voice data, thereby finishing real-time interchange. The invention can solve the problem of real-time transmission of voice without the participation of a CPU and a memory and also does not need to compile an IIS driver.

Description

【Technical field】 [0001] The invention belongs to network switching products such as gateways and routers, and specifically refers to a PCM time slot switching method that can directly perform voice switching with a voice codec. 【Background technique】 [0002] In the wireless home gateway project, voice services need to be processed. The audio interface of some wireless modules is in PCM stream format. However, many audio codecs do not support direct interface with PCM voice data, and these codecs have compatibility problems when they are connected with various devices with PCM voice. Therefore, it is necessary to solve the problem of voice exchange between PCM voice data and voice codec. [0003] In the prior art, the common practice is to connect the PCM voice data to the CPU, and the CPU completes the uplink and downlink processing of the time slot, and at the same time, the IIS bus of the CPU and the voice codec complete the communication of the voice data. The disadv...

AI Technical Summary

Problems solved by technology

[0004] 1) Because voice data needs to be processed in real time, this method will inevitably take up a lot of CPU time

[0005] 2) The amount of voice data is large, and buffering these data needs to occupy memory resources. In embedded systems, memory resources are also relatively precious

[0006] 3) It is necessary to solve the driver problem of the IIS bus. In some CPUs, such as the CPU7130 of ATHEROS, since the IIS bus driver is not provided

To complete this driver, it will take more time for software personnel to explore

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