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Updated GB_set_highpass_filter_mode (markdown)

Lior Halphon 2024-11-28 22:48:21 +02:00
parent 9037d3dc54
commit 8a3cfb769b
1 changed files with 10 additions and 2 deletions
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GB_set_highpass_filter_mode.md

@ -9,14 +9,22 @@ typedef enum {
} GB_highpass_mode_t;
```
<tt>void GB_set_highpass_filter_mode([[GB_gameboy_t]] *gb, [[GB_highpass_mode_t]] mode);</tt>
<tt>void GB_set_highpass_filter_mode([[GB_gameboy_t]] *gb, GB_highpass_mode_t mode);</tt>
In `apu.h`
## Description
TBD
A real Game Boy has its audio output going through a high-pass filter before reaching the built-in speaker or headphones, which removes the variable DC-offset the digital output generates. This function controls the high-pass filter the emulator instance uses:
* `GB_HIGHPASS_OFF`: No high-pass filter is used, the DC offset remains
* `GB_HIGHPASS_ACCURATE`: A simple high-pass filter is applied; this setting best represents the hardware behavior
* `GB_HIGHPASS_REMOVE_DC_OFFSET`: The DC offset is separated from the actual wave form, and a simple high-pass filter is only applied to the DC offset part
## Thread Safety
`GB_set_highpass_filter_mode` is thread-safe and can be called from any thread and context.
## Notes
Keep in mind that the DC offset is not constant prior to applying the high-pass filter.