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[ALSA] snd-emu10k1: Add a comment explaining the conversion function for dB gain.

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Signed-off-by: James Courtier-Dutton <James@superbug.co.uk>
Signed-off-by: Jaroslav Kysela <perex@suse.cz>
This commit is contained in:
James Courtier-Dutton 2006-07-28 22:27:56 +01:00 committed by Jaroslav Kysela
parent 4e195a7b78
commit 7012b2dac7
1 changed files with 1 additions and 0 deletions
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sound/pci/emu10k1/emufx.c
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@ -267,6 +267,7 @@ static const u32 treble_table[41][5] = {
{ 0x37c4448b, 0xa45ef51d, 0x262f3267, 0x081e36dc, 0xfd8f5d14 }
};
/* dB gain = (float) 20 * log10( float(db_table_value) / 0x8000000 ) */
static const u32 db_table[101] = {
0x00000000, 0x01571f82, 0x01674b41, 0x01783a1b, 0x0189f540,
0x019c8651, 0x01aff763, 0x01c45306, 0x01d9a446, 0x01eff6b8,