09-18-2018, 08:00 AM
The white noise is a known issue. It seems more obvious on some builds than others. One thing that "solves" it for some people is to play with the balance between software volume and hardware (thumb wheel) volume. You can set the software volume from the main menu (tap START after bootup, IIRC). Try turning it down or up and then rebooting.
The fix of playing a splash bootup video is also a good one. What happens is that the software tells the Raspberry Pi to set these outputs to PWM for audio, but it doesn't necessarily initialize them to anything until the first audio is played. Prior to that they are just "floating" and are more susceptible to outside noise influencing them.
The HDMI uses a different output, so that's unaffected by this.
The headphones actually use the same output, but they are un-amplified. It's the amplification of the noise that you are likely hearing.
The fix of playing a splash bootup video is also a good one. What happens is that the software tells the Raspberry Pi to set these outputs to PWM for audio, but it doesn't necessarily initialize them to anything until the first audio is played. Prior to that they are just "floating" and are more susceptible to outside noise influencing them.
The HDMI uses a different output, so that's unaffected by this.
The headphones actually use the same output, but they are un-amplified. It's the amplification of the noise that you are likely hearing.
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Neo Geo Pocket Flash Cart and Linker Project ( http://www.flashmasta.com/ )
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