How to implement Adaptive Filter in ADAU1701 .

Hi Charles,

Unfortunately there is no support for direct programming of the ADAU1701, or any other SigmaDSP processor. You can read more about this at the FAQ on this page:

FAQ: Can I write C or assembly code for SigmaDSP in SigmaStudio?

It is possible to create fairly complex algorithms using the existing graphical library cells. Perhaps you would be able to implement your adaptive filter that way.

However, since the ADAU1701 SigmaDSP is purely a stream processor (incapable of block processing or frequency-domain processing), I think it is unlikely that you would be able to implement something as complex as a voice codec.

Best Regards,

Brett

HI Brett,

appreciate your reply.

can u suggest me a way to implement block processing and pimitive DSP

functions such as:

1. search max. absolut magitude in a block of data.

2. AMDF fuction

3. cross-corelation function

4. auto scale of buffer.

5. ..

br

charles

2013/9/14 BrettG <analogvm-admin@analog-vm.hosted.jivesoftware.com>

**

EngineerZone <http://ez.analog.com/index.jspa>; Re: How to

implement Adaptive Filter in ADAU1701 . created by BrettG<http://ez.analog.com/people/BrettG>in

SigmaDSP Processors and SigmaStudio Development Tool - View the full

discussion <http://ez.analog.com/message/117495#117495>;

Hi Charles:

Even though Brett is correct, there are other recommendation we can provide. Can describe what type of filter you are thinking of doing and what voice codec were you considering?

Based on the your previous reply, one limitation of the SigmaDSP is the search you mention, all other elements are faily easy to be implemented.

thank you

Miguel

Hello Charles,

It seems like things that are trivial in C are often difficult in the graphical environment. For example, it is possible to search through a short delay for some event (such as a maximum or a zero crossing), but it gets rather cumbersome -- see https://ez.analog.com/thread/18706 . On the other hand, SigmaStudio makes it easy to construct rather complex processing flows without writing a line of code. Although originally intended for audio post-processing, SigmaDSP has found some quite novel applications.

Judging from what smartphone apps are doing, ARM processors are capable of much more than Sigma DSP -- for example, decoding MP3s and FFT spectrum analysis. If you need a dedicated DSP of greater power, perhaps a Sharc or Blackfin would do. SigmaStudio for Sharc allows you to build custom functions in C, then embody them as blocks in a SigmaStudio project. This could provide you with the best of both worlds.

Best regards,

Bob

Hi, Bob,

write in C is rather simple than in assemble .

i wote more than 40 type of assemble lang. experience .

i would like to build my block in assemble / C .and then the other fuction

can be finished with graphical tool .

this would be perfect .

br

charles

2013/9/16 KJBob <analogvm-admin@analog-vm.hosted.jivesoftware.com>

**

EngineerZone <http://ez.analog.com/index.jspa>;

Re: How to implement Adaptive Filter in ADAU1701 .

created by Robert Blowsky <http://ez.analog.com/people/KJBob>; in *SigmaDSP

Processors and SigmaStudio Development Tool* - View the full discussion<http://ez.analog.com/message/117536#117536>;

hi,

i have a question about the adc and dac. is it a single-bit sigma-delta or

multi-bit sigma-delta?

br

charles

2013/9/16 上午10:33 於 "Chau Charlesmic" <charlesmic2013@gmail.com> 寫道：

Hi, Bob,

write in C is rather simple than in assemble .

i wote more than 40 type of assemble lang. experience .

i would like to build my block in assemble / C .and then the other fuction

can be finished with graphical tool .

this would be perfect .

br

charles

>

2013/9/16 KJBob <analogvm-admin@analog-vm.hosted.jivesoftware.com>

>> **

>> EngineerZone <http://ez.analog.com/index.jspa>;

>> Re: How to implement Adaptive Filter in ADAU1701 .

>> created by Robert Blowsky <http://ez.analog.com/people/KJBob>; in *SigmaDSP

>> Processors and SigmaStudio Development Tool* - View the full discussion<http://ez.analog.com/message/117536#117536>;

>>

Hi Charles,

Our parts are multi-bit sigma-delta.

Best regards,

Coleman

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EZ Admin