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Original question:

TAS2505: HP Pop noise

TAS2505: When sound volume increase, POP noise occured.

Amelie Zheng
Genius 10865 points
Part Number: TAS2505

Hi Team,

My customer now use TAS2505 in their system. CPU→I2S→TAS2505→Speaker.

When the sound volume is normal, it is OK and normal.

But when the sound volume increase, it has POP noise.

Customer has change the speaker, but the noise is still no change.

Could you please give some advice?

Thanks!

  • 0
    TI__Genius 10865 points

    Hi Team,

    Here is the TAS2505 SCH.

  • 0 in reply to Amelie Zheng
    TI__Guru* 84915 points

    Hi, Amelie,

    Thank you for providing the schematic.

    Our team will take a look at this thread and will answer as soon as possible.

    Best regards,
    Luis Fernando Rodríguez S.

  • 0 in reply to Luis Fernando Rodriguez S.
    TI__Genius 15120 points

    Hello Amelie,

    • Can you clarify what you mean by pop?
    • Is the 'pop' noise you hear is when audio is actively playing and you change the volume or when audio is not playing and the volume level is changed.
    • Can you provide the i2c configuration you are using for the TAS2505-Q1?
    • Can you provide a scope shot of your startup sequence (See section 3.1 in TAS2505 Application reference guide http://www.ti.com/lit/ug/slau472/slau472.pdf#page=45)

    Best Regards,

    Luis

  • 0 in reply to Luis Fernandes de Pina
    TI__Genius 10865 points

    Hi Luis,

    Thanks for your reply. I have asked customer to provide more information and will update as soon as I received.

    Could you please offer a standard register configuration about I2S input and SPK output for us to refer?

    Customer also doubt that whether their configuration has problem...

    Thanks!

  • 0 in reply to Luis Fernandes de Pina
    TI__Genius 10865 points

    Hi Luis,

    Here are customers feedback:

    • Can you clarify what you mean by pop? when the volume is large, we can hear cracking voice from the speaker

                    >>>>>when the volume is large, we can hear cracking voice from the speaker

    • Is the 'pop' noise you hear is when audio is actively playing and you change the volume or when audio is not playing and the volume level is changed.

                   >>>>> the latter

    • Can you provide the i2c configuration you are using for the TAS2505-Q1?

                    >>>>>as follow:

        0x00, 0x00,

        0x01, 0x01,

        0x00, 0x01,

        0x02, 0x00,

        0x00, 0x00,

        0x04, 0x07,

        0x05, 0x94,

        0x06, 0x04,

        0x07, 0x00,

        0x08, 0x01, 

        //delay 15ms

        0x0B, 0x84,

        0x0C, 0x82,

        0x0D, 0x00,

        0x0E, 0x80,

        0x1B, 0x00,

        0x1C, 0x00,

        0x3c, 0x02,

        0x00, 0x01,

        0x01, 0x10,

        0x0A, 0x00,

        0x0C, 0x00,

        0x16, 0x00,

        0x18, 0x00,

        //0x09, 0x20,

        //0x10, 0x1C,

        0x2E, 0x00,

        0x30, 0x50,

        0x2D, 0x02,

        0x00, 0x00,

        0x3F, 0x91,

        0x41, 0x0a,//+(0.5x)db

        0x40, 0x04,

  • 0 in reply to Amelie Zheng
    TI__Guru* 84915 points

    Hi, Luis and Amelie,

    Excuse me, what is the current status of this case? Were you able to find the root cause?

    Thank you.

    Best regards,
    Luis Fernando Rodríguez S.

  • 0 in reply to Luis Fernando Rodriguez S.
    TI__Genius 10865 points

    Hi Luis,

    Seems customer has sent me the output waveform. The waveform is cutting roof when increasing the volume.

    That is the reason why have the pop sounds.

    Thanks for your concern!