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Glitches and distortions when Sample Rate is 192khz.


Loweaul
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    Well this issue had been found in last year when I was first using PA in a Android based on MediaTek, which really means I hadn't seeing such an issue when using a Android based on Snapdragon, few months ago I posted this issue in Chinese Form to see if there's anyone had found this issue like I do, but only a few of people did have the issue.

    So to reproduce the issue, first you need a Android based on MediaTek, mine is Dimensity 920, and then using Hi-Res output via Wired HeadSet/AUX, switching Sample Rate to 192khz, eventually you will hear the glitches and distortion when music replaying.

    This issue can't be recorded in video maybe due to Android SRC, but if you need a video I would like to flim it directly.

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Have you tried increasing the buffer size in the Hi-Res Output settings page? If your music is on SD Card (you don't mention the device you are using) does the problem also occur if you put a few songs onto internal memory and play them from there? Have you tried with DVC enabled and disabled?

Andre

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@Loweaul buffer can be increased one-two steps, also you may try AAudio output + 192khz. This may be a bit more stable on the latest Androids (12-13+). You can also try to switch to different sample format.

But from my experience, if it doesn't work smoothly, your device may be never intended to produce hi-res sound, esp. if this is not advertised on the OEM product specifications page.

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3 hours ago, andrewilley said:

Have you tried increasing the buffer size in the Hi-Res Output settings page? If your music is on SD Card (you don't mention the device you are using) does the problem also occur if you put a few songs onto internal memory and play them from there? Have you tried with DVC enabled and disabled?

Andre

I have tried different buffer size before and it doesn't help a bit, the music is on internal storage, and it is the same no matter DVC is on or off.

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3 hours ago, maxmp said:

@Loweaul buffer can be increased one-two steps, also you may try AAudio output + 192khz. This may be a bit more stable on the latest Androids (12-13+). You can also try to switch to different sample format.

But from my experience, if it doesn't work smoothly, your device may be never intended to produce hi-res sound, esp. if this is not advertised on the OEM product specifications page.

    using AAudio Output, sample rate would be forcing to 48khz, and in Hi-Res output I try to switch to different sample format, the issue still exists.

   So personally I would say that is something related to MediaTek SoC, there is still a long way to go for MediaTek, replaying video or audio via MediaTek SoC, issues just coming up frequently 😂.

   Anyway, thanks for explaining and supporting. I see the reasons now.

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  • Solution

@Loweaul actually, MTKs have a long history of supporting Hi-Res without any issues. DVC works fine when it's supported. But while almost all SOCs out there do support hi-res, OEMs choose not to support it across the range of their devices (i.e. phones).

So if OEM claims it's supported for that phone mode, it most probably will work, but if OEM doesn't have such claim, it may work, or may work unreliable, may work on some firmware and fail with updates, etc.

Unfortunately, must having Hi-Res capable SOC in the device does not mean your phone can produce hi-res output - at least on 3.5 output, as USB and Bluetooth audio implementations are software and not dependent on the SOC.

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