TAS5756M: Right channel biqual no effect for high frequency output

KesTam

Part Number: TAS5756M

Hello Audio Folks, a customer met a strange issue on the biqual filter for the high frequency output. The left channel is OK, but right channel is failed.

Below is the setting and result in PPC2.

Below is the frequency scan with AP using TAS5756 EVM board from TI.

The left and right channel are identical up to 5KHz, then start deviating. Left chanel follow the setting as in PPC2. Right channel seem to be no effect or something wrong there.

For TAS5754/56 and PPC2, there are no separation on the left and right channel for the biqual filter. Why left and right channel are difference. Will it be a bug in PPC2 coding?

Regards,

Kes

over 8 years ago

0 Jeff Kohnle over 8 years ago

TI__Expert 6985 points

Hello Kes! Good to hear from you! I have looped in Roy who should be able to close back with you on this topic. Thanks, Jeff

0 Andy Liu (BMS) over 8 years ago in reply to Jeff Kohnle

TI__Guru 52115 points

Hello Kes,

Could you share with us the tuning file (.xml) so that we can duplicate the same issue?

Andy

0 KesTam over 8 years ago

TI__Genius 9550 points

Hi Andy, I have tried to attached the file at the beginning. But, don't know why, the e2e insert file function is not OK. I will send you through e-mail.

Kes

0 KesTam over 8 years ago in reply to KesTam

TI__Genius 9550 points

Hi Andy, customer finally find it is their AP digital output issue. It is not our IC problem.

Regards,
Kes

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TAS5756M: Right channel biqual no effect for high frequency output