SigmaDSP Processors

Hello Kevin,

None of the SigmaDSPs have integrated flash, but some can "self-boot" from a small external E2PROM. Unfortunately, the ADAU1761 isn't one of them, so you will need a modest micro to boot the DSP. This means you'll need to do some uC programming, yet the uC can then exercise real-time control over your audio parameters -- a real advantage in some applications.

By ANC, do you mean active noise cancellation as provided by noise-cancelling headphones? Often, applications like this require the very lowest latency (group delay) between the DSP's audio inputs and outputs. The ADAU1787 has the required low latency, and it also self-boots. A quick look at its data sheet suggests it's quite different from the ADAU1761 and other SigmaDSPs I'm familiar with, so I must defer to those who have experience with this DSP.

Best regards,

Bob

Thank you very much for the answer. I will move on to the ADAU1787 processor.

Hello Kevin,

Depending on your needs,... You may be able to use the ADAU1452/1467 family of processors. They have a lot of functionality to operate in a standalone environment. They also can run the Active echo cancellation (AEC) and noise cancellation (NR) algorithms that we developed. It will depend on your application and requirements for size, power and if it is indeed an ANC application.

For ANC the ADAU1787 is a great part but it is a wafer level PGA so it presents some challenge for the PCB layout costs and the max AVDD power is 1.8V which may also be an issue. Since there are two cores in the 1787 and may hardware features the programming using SigmaStudio is a bit more tricky than the older generations of parts.

Dave T

Hi Dave, I also have an acoustic echo cancellation need as part of a medical project.

Is it possible to achieve this: ITU G.167 or better, Full duplex,
Bandwidth 8 kHz, Tail length >= 200 ms, echo cancellation > 40 dB
Noise reduction, howling control, non-linear processor and double-talk detector, signal noise ratio >= 80 dB

It is an intercom, only 2 nodes. Communication is digital, delays over the cable are small enough.

How many MIPS do we need? Can you recommend a SigmaDSP or SHARC with this?

And how does the SigmaStudio work? Purchase price and are there fees per node? What are the fees?

Regards,

Pieter

Hello Pieter,

The AEC block we have may be able to fulfill your requirements. I am not an expert on these standards but I know that our algorithms meets the Skype for Business requirements so it should meet or exceed the ITU standard you cited. We can discuss this in a follow up. I think the SigmaDSP would work well for this application. Have a look at this detailed discussion and there is a link for licensing information. If you do not get very far then send me a private message and I will get the support you need.

https://wiki.analog.com/resources/tools-software/sigmastudio/toolbox/adialgorithms/aec

Dave T