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The Audio Conference Bridge enables a voice call with multiple (n>2) attendants, as described in Figure 1. The algorithm monitors the voice signals from all attendants, and creates the signals to be transmitted to the attendants.
This application cannot be implemented using solely the DSK6713, as it has only 2 analog ports. Therefore two daughterboards, the TLV320AIC20/20KEVM and the DSP/CODEC development platform, are used. In this example we will integrate an algorithm based on Simulink blocks, with a legacy driver.
This module demonstrates the use of the device driver building blocks together with legacy code integration to implement a custom device driver on the DSK6713. This feature allows the use of the Simulink® environment with user-specific drivers.
A wide range of algorithms exist, in the current chapter a simple algorithm based on finding the maximum level among 3 attendants is implemented
The DSK6713 supports stereo analog inputs and outputs. The Audio Conference Bridge application demands more analog ports. In this example we will use TLV320AIC24EVM An additional board the DSP-CODEC Platform () is also needed. This board mainly interfaces between the TLV320AIC24EVM connector and the peripherals connector in the DSK6713. (). This board contains two TLV320AIC24 () stereo CODECs, thus supporting 4 audio channels. The system is shown in Figure 2.
The TLV320AIC24 implements the smart time division multiplexed serial port (SMARTDM™). The SMARTDM port is a synchronous 4-wire serial port in TDM format for glue-free interface to TI DSPs. The TLV320AIC24 can be gluelessly cascaded to any SMARTDM-based device to form a multichannel CODEC, and up to eight TLV320AIC2x CODECs can be cascaded We will use a single EVM board in this example. .
The SMARTDM port is connected to the Multichannel Buffered Serial Port (McBSP) in the DSP as shown in Figure 3.
The TLV320AIC24 supports various types of analog interfaces, and can operate with sampling rates to 104 KSPS, with 16 bit samples. The block diagram is shown in Figure 4. The TLV320AIC24 features are summarized in Figure 5.
The driver operates in a double-buffering scheme as shown in Figure 6. There are two buffers in each direction (Receive/Transmit). For each frame to processes occur simultaneously:
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