Talk:C5000 eZDSP

Comments on Ezdsp -

Wa4fyn said ...
The Softrock Radio community was alerted to this product release. Currently, our software defined radios are dependent on computers to provide the dsp function as a quadrature signal is sent to the computer audio input from the receiver. The quadrature bandwith is 96 kc, or 48~kc.

Can this be the component that will enable us to build a stand alone radio? (see yahoo groups "Softrock40" for details on the radio.

We were just beginning to look for something like this.

tom - wa4fyn

--Wa4fyn 19:16, 17 September 2009 (CDT)

Perhaps TI would prefer we use the E2E Forum for these sorts of questions, but I think the answer to your question is possibly "Yes."

Your radio interface hardware would connect to the Stereo in jack of the eZdsp, but the quadrature calculations would happen in the C5515 or C5505 DSP. Your DSP firmware would read from the codec, calculate the quadrature, and then implement USB functions to pass the resulting data on to the computer. Both versions of the eZdsp have the TLV320AIC3204 32-bit stereo codec, which is limited to 48 kHz, so I'm not sure that you would have the necessary signal bandwidth for your processing. The C55x5 DSP should have plenty of processing power, though. I have used the C5506, which has plenty of power, and I believe the C55x5 has even more. If the 48 kHz sample rate (and therefore 24 kHz signal bandwidth) is sufficient for your quadrature processing, then another challenge will be to implement a USB-Audio function for the eZdsp. There may be sample code from Texas Instruments for this, but it may be incomplete. It can be quite challenging to develop USB-Audio firmware on a custom USB device, and you might find this to be a significant distraction from your focus on radio.

Rsdio 19:18, 5 January 2011 (CST)

Correction: I looked closer at the eZdsp codec, and by page 32 they mention 192 kHz, so perhaps these inexpensive boards would meet all of your hardware requirements after all.

Rsdio 23:47, 6 January 2011 (CST)