TMS320C5517: problem about VoLIB component AEU

user5926475

Part Number: TMS320C5517

Hi,

I am using AEU Automatic Level Control(ALC) to implement automatic gain control in a voice system , when I set ALC target level to -15dBm0(veuConfig.alc_recv_level = -15), the Rxout output level not the expected -15dbm0( I measure the output signal with a level meter).

AEU seting(veuControl) is:

80
0
0x0121
0x0121
2
-15
3
-15

input Rxin signal is in inBufRx and

veuReceiveIn (veuInst,inBufRx );

veuSendIn (veuInst, inBufTx, inBufRx, outBufTx, NULL);

then, the Rxout is in inBufRx..

when the inBufRx is output from DA, the level should be -15dbm0.

but the result is the output level varied with the input level changed.

Is there something wrong?

the Volib version is 2_1_0_1(ti_mas_volib_2_1_0_1_C55_cpu3).

the CCS is Version:5.5.0.00077.

Best Regards!

Dudechao

over 4 years ago

0 Frank Livingston over 4 years ago

TI__Mastermind 30108 points

Hi,

I'm reaching out to internal experts. I'll keep you posted.

Regards,
Frank

0 Frank Livingston over 4 years ago

TI__Mastermind 30108 points

Hi Dudechao,

I spoke with someone familiar with VOLIB. He suggested the following:

Using a sound level meter to measure the sound level is not accurate. The measured level will fluctuate. I would recommend dumping the output of ALC to a file and calculating the level
ALC doesn't adjust the sound level immediately to the desired level. It takes some time. Again, capturing the ALC output can show whether ALC is doing the work or not.

Regards,
Frank

0 user5926475 over 4 years ago

Intellectual 270 points

Hi Frank ,

Thank you for your help!

I 'll check it later.

Best Regard!

Dudechao

0 user5926475 over 4 years ago in reply to Frank Livingston

Intellectual 270 points

Hi Frank ,

Thank you for your help!

"capturing the ALC output can show whether ALC is doning the work or not ",I 'll check it later.

Best Regard!

Dudechao

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TMS320C5517: problem about VoLIB component AEU