• State TI Thinks Resolved
  • Locked Locked
  • Replies 5 replies
  • Answers 1 answer
  • Subscribers 30 subscribers
  • Views 464 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

Original question:

TAS2505: When sound volume increase, POP noise occured.

TAS5411-Q1: when change to STANDBY mode, POP noise occured

Amelie Zheng
Genius 10865 points
Part Number: TAS5411-Q1

Hi Team,

My customer now use TAS5411-Q1 in their TCU and now is doing test.

When the TAS5411 worked normal and then add some fault manually (such as open load).

In order to read the register to read out the fault, customer change mode to standy.

During changing to standby mode, there will be POP noise occur  in TAS5411-Q1.

Even though customer first change to mute, after mute mode, change mute to standby, the noise is still occurred.

Could you please offer some advice or guidance?

Thanks!

  • 0
    TI__Genius 10830 points

    Amelie,

    May you check the pop noise of STANDBY->MUTE with EVM board. We need to understand the pop noise level with EVM as comparison data. (If there is ITU-R filter for pop noise measurement in customer side, that would be perfect.)

    Also may you check if there is also similar pop noise from STANDBY to MUTE mode?

    Dylan

  • 0 in reply to Dylan Yao
    TI__Genius 10865 points

    Hi Dylan,

    Customer also use EVM to test. And the EVM also has this kind of noise.

    And when change from STANDBY to MUTE mode, it also has the noise.

    Could you please give some advice?

    Thanks!

  • 0 in reply to Amelie Zheng
    TI__Genius 10865 points

    Hi Dylan,

    May I ask what "ITU-R filter for pop noise measurement" means? Does it mean to add another extra filter?

    As customer feedback, no matter in play or mute mode, when change to Standby, the POP noise will occur.

    Is it possible because of the mosfet off- on?

  • 0 in reply to Amelie Zheng
    TI__Genius 10830 points

    Amelie,

    Consider the message that "Customer also use EVM to test. And the EVM also has this kind of noise."  Then my judgement is the pop noise level is low enough already.  I believe customer is listening the pop noise by put speaker beside ear, which is not a reasonable test scenario.

    The pop noise comes from output DC offset. when switch from MUTE->STANDBY or STANBY->MUTE, the DC offset voltage will be a step voltage applied to speaker.  Out AMP has trimmed the DC offset to make sure pop voltage level is low enough. Please ask customer to use a correct test scenario(based on Car OEM) to test.

    Dylan

  • 0 in reply to Dylan Yao
    TI__Genius 10830 points

    Amelie,

    The same, i will close this topic.