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| author | James Courtier-Dutton <James@superbug.co.uk> | 2006-07-29 01:27:56 +0400 |
|---|---|---|
| committer | Jaroslav Kysela <perex@suse.cz> | 2006-09-23 12:39:37 +0400 |
| commit | 7012b2dac71988f61b520b33c70c63be372b5994 (patch) | |
| tree | f6dd2ee18b2d2604b3822e5c14331ad60e126e0e | |
| parent | 4e195a7b78618c89b06547f3140e67a69ec23272 (diff) | |
| download | linux-7012b2dac71988f61b520b33c70c63be372b5994.tar.xz | |
[ALSA] snd-emu10k1: Add a comment explaining the conversion function for dB gain.
Signed-off-by: James Courtier-Dutton <James@superbug.co.uk>
Signed-off-by: Jaroslav Kysela <perex@suse.cz>
| -rw-r--r-- | sound/pci/emu10k1/emufx.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/sound/pci/emu10k1/emufx.c b/sound/pci/emu10k1/emufx.c index 00fc904c251d..13cd6ce89811 100644 --- a/sound/pci/emu10k1/emufx.c +++ b/sound/pci/emu10k1/emufx.c @@ -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, |