Verify ANR by using VEU component of VOLIB.

Will,

As you referred to another post:  http://e2e.ti.com/support/embedded/bios/f/355/p/224581/791496.aspx. Did you see the noise reduced? What is your veu_nb_nb.set file?

Regards, Eric

Will,

Another point, do you have noise in your input file? If not, input and output will be similar.

Regards, Eric

Hi Eric,

Did you see the noise reduced?

I saw output file and input file are different, but I am not sure which noise was reduced.

What is your veu_nb_nb.set file?

I got test file from the post, the test file is 0552.anr.zip.

The test case was created by TI employee.

The content of veu_nb_nb.set:

80
0
0x0007
0x0007
1
12

I build and run VEU example of volib_C55_2_0_0_3 on C5535EzDsp by using the test file from the post. 

However, I found the test result are different when I compared the output file which generated by my example with test file.

Moreover, I got the same test result when I change ANR_LEVEL (6,12,18,24) on the veu_nb_nb.set.

My test result :

I have few questions as follow.
1. How could you identify this output file was successful example of noise reduction? 

    Did you use other tools to verify this output file? If yes, can you tell me which tool you use.

2. Why does the example need to read the rin file(ANR_rin_8k.pcm)? Is it necessary for noise reduction?

Thanks for your reply.

Regards,

Will

Hello,

I'm in exactly in the same case of Will Lin1 i have a C5535EZDSP and I test the ANR which seem to do nothing.
(It's not a simulation but a real time test: with Audacity I output the sound of "ALC_male_sin_8k" with white noise into my EZDSP card)
Then i hear output sound from DSP. 

I can clearly hear the white noise in the background when i'm in pathtrough.
When i activate ANR with the same parameter as above :

80
0
0x0007
0x0007
1
12 

It seem nothing change (i can not hear any change on output....)
So I have two question to be clear: 

As it was asked before there is a note in datasheet which say:
"Remarks: veuReceiveIn() should be called before veuSendIn()."

1) It's not the case in the sample program can anyone give a explanation ? 

2) Someone can explain what is the right function call path for sample to be treated?

For example i have input sample from ADC then should i call "veuReceiveIn" then "veuSendIn" (or inverse) and then put sample to output?
What buffer should we put in "veuSendIn"?
For the moment here is my call path:

inBufRx=GetADCSample(); //16bit Sample are in inBufRx

veuReceiveIn (veuInst, inBufRx);

veuSendIn (veuInst, inBufRx, trashBuffer, outputBuffer , NULL);//Trash buffer is an empty buffer is this Okay or do we need to put something?

PutDACSample(outputBuffer);

Is it the right call path?

Thank you,

Max
 

Hi Eric,

I have one more questions.

I want to take VEU example to reduce background noise when audio file with background noise.

Can I use VEU example to do noise reduction on any audio file not just for 8KHz sample rate? 

If not, is there any other example I can try? 

Regards,

Will

Will,

Some answers:

1) "Remarks: veuReceiveIn() should be called before veuSendIn()." Can anyone give me a explanation ?. But in the sample code, the calling order was reversed.

The document is correct, but it is not a very important issue. Receive_in does certain power measurements for the send path decision. Calling receive_in after send_in will cause a delay to the measurements. In most cases, this is not very critical.

2) For sampling rate support:

We have separate libraries for narrow-band (8KHz) and wide-band (16KHz). Narrow-band library only supports 8kHz. Wide-band library supports both, but we do not include unit test for wide-band. The WB library is veu16_c.a55L.

3) The C55x doesn't suppress the noise, the configuration veu_nb_nb.set for C64x+ doesn't work.

We saw this issue on C55x and our engineers are investigate what was wrong.

Regards, Eric 

Hi Eric,

Thanks for your reply.

Does TI have a specific schedule to release the new version VoLib ?

Regards,

Will

Hello Eric,

Thank you for your investigation.
I try to make ANR work on C55 since more one week without success.
Please post here when you find a solution.

Regards,

Max

Will and Max,

Sorry for the late response. I created two ticket SDOCM98494 and SDOCM98495 to track those (documentation and C55x ANR doesn't work). The resolution of these IRs are currently not scheduled but you will be notified once they are flixed in a new release.

https://cqweb.ext.ti.com/cqweb/main?command=GenerateMainFrame&service=CQ&schema=SDO-Web&contextid=SDOWP&entityID=SDOCM00098494&entityDefName=IncidentReport&username=readonly&password=readonly

https://cqweb.ext.ti.com/cqweb/main?command=GenerateMainFrame&service=CQ&schema=SDO-Web&contextid=SDOWP&entityID=SDOCM00098495&entityDefName=IncidentReport&username=readonly&password=readonly

Regards, Eric

Hi Eric,

Dose TI have a schedule to release the new version of VoLib (for the C55x ANR issue)?