NMU noise level problem

Jean-Denis Boyer

Other Parts Discussed in Thread: OMAP-L138

Hi Charlie.

When the function nmuTxProcess generates a SID payload, the data is always set to 0x46 (70), no matter what the level format is set. I expect it to be 0x4C (76).

When calling nmutxOpen(), I set the noise_mode (in ifnmutxConfig_t) to ifnmutx_CONFIG_NOISE_MODE_NONE, and the level_format (in nmutxOpenConfig_t) to nmutx_LEVEL_FORMAT_dBov. I tried in dBm also, and the data never changes, it stays 0x46.

The level is supposed to be constant to -76dBov (-70dBm).

What is wrong?

Regards,

Jean-Denis Boyer

over 13 years ago

0 Chad Courtney over 13 years ago

TI__Mastermind 30825 points

Jean-Denis,

I'm not familiar with this function name. Can you provide details such as, SW package your using, the device you're using, etc? This may be posted in the wrong forum as well.

Best Regards,

Chad

0 Jean-Denis Boyer over 13 years ago in reply to Chad Courtney

Prodigy 250 points

NMU is the Noise Matching Unit, a module from the Voice library (VoLIB).

It's probably the wrong forum, yes. I followed a post that was made on it announcing the release of VoLIB. I will use the "BIOS forum" instead.

Regards,

Jean-Denis Boyer

0 CharlieF over 13 years ago

TI__Intellectual 1605 points

Hi Jean-Denis,

How are you determining the level? Are you using the nmutxGetStats() API function? If so, this routine always returns the level in dBm0.

Regards,
Charlie

0 Jean-Denis Boyer over 13 years ago in reply to CharlieF

Prodigy 250 points

Hi Charlie.

No, I don't use this function, which is clearly documented to be in dBm0.

I'm talking about the SID payload generated by function nmutxProcess. It does not seem to respect the level format (dBov), which I specified when calling nmutxOpen, and always output in dBm.

Regards,

Jean-Denis

0 CharlieF over 13 years ago in reply to Jean-Denis Boyer

TI__Intellectual 1605 points

Hi Jean-Denis,

I will try to reproduce this locally. Which platform are you using? C66x?

Regards,
Charlie

0 Jean-Denis Boyer over 13 years ago in reply to CharlieF

Prodigy 250 points

Hi Charlie.

I'm running a OMAP-L138, which has a C674x DSP.

The library I link with is "nmu_c.ae64P" from "volib_C64P_2_0_0_3".

Regards,

Jean-Denis

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NMU noise level problem