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Pink noise as a source (mode "pink")

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Core: aes67_tx_pink_noise(), a ready-made TX source: xorshift32 white noise
through Paul Kellet's pink filter, -18 dBFS RMS (peaks about -6 dBFS), same
on L and R. The player uses it like the tone (straight to TX, no volume or
gain). Checked on the board: -18 dBFS RMS, octave bands 63 Hz-4 kHz flat
within +-0.4 dB, L = R.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
Ben Nicholson
2026-09-25 23:37:05 +10:00
parent bbeb7d3fd2
commit 122e46e862
8 changed files with 58 additions and 16 deletions
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main/project_cfg.c
+1 -1
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@@ -12,7 +12,7 @@ static const char SOURCE_DEFAULTS[] =
static bool source_validate(const cJSON *g, char *err, size_t n)
{
static const char *const modes[] = { "spotify", "hls", "auto", "tone", "off", NULL };
static const char *const modes[] = { "spotify", "hls", "auto", "tone", "pink", "off", NULL };
static const double bitrates[] = { 96, 160, 320 };
return cfg_check_enum(g, "mode", modes, err, n) &&
cfg_check_str(g, "spotify_name", 1, 63, err, n) &&