diff options
| author | Mark Brown <broonie@opensource.wolfsonmicro.com> | 2010-10-21 21:24:49 -0700 |
|---|---|---|
| committer | Arve Hjønnevåg <arve@android.com> | 2011-11-17 17:51:31 -0800 |
| commit | a7f7af3ac651cddd95d26508cd9ec186e9e96c51 (patch) | |
| tree | 1ca7e9331b3756c21622f089afc4d63220b372f0 /sound | |
| parent | a3022a489d100be357fbcf748eca8056adb06767 (diff) | |
| download | kernel_samsung_crespo-a7f7af3ac651cddd95d26508cd9ec186e9e96c51.zip kernel_samsung_crespo-a7f7af3ac651cddd95d26508cd9ec186e9e96c51.tar.gz kernel_samsung_crespo-a7f7af3ac651cddd95d26508cd9ec186e9e96c51.tar.bz2 | |
ASoC: Tweak gains for voice recognition
The signal level was observed to be very low when doing recordings for
voice recognition from headphone sources, and also from main microphone.
Change this by:
- Increasing the gain for headphone case, applying an additional 3dB in
the mic preamp and +30dB from the input mixer.
- Removing +6dB digital gain for main mic (since digital gain will only
increase the signal level, not recover extra information after ADC has
quantized the data).
- Updating main mic analogue settings to match normal record for an
aggregate change from 21dB to 40.5dB.
The most observable user level effect of the above being that the signal
meter displayed by the voice search application registers a fairly clear
signal while previously the signal levels appeared very flat.
Change-Id: I3beaf70ab7649f678e105fa75cd09f2a80749f99
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Diffstat (limited to 'sound')
| -rw-r--r-- | sound/soc/codecs/wm8994_herring.c | 12 |
1 files changed, 6 insertions, 6 deletions
diff --git a/sound/soc/codecs/wm8994_herring.c b/sound/soc/codecs/wm8994_herring.c index 68dcf18..0650755 100644 --- a/sound/soc/codecs/wm8994_herring.c +++ b/sound/soc/codecs/wm8994_herring.c @@ -408,32 +408,32 @@ struct gain_info_t recording_gain_table[RECORDING_GAIN_NUM] = { .mode = RECORDING_REC_MAIN, .reg = WM8994_LEFT_LINE_INPUT_1_2_VOLUME, /* 18h */ .mask = WM8994_IN1L_VOL_MASK, - .gain = WM8994_IN1L_VU | 0x1C + .gain = WM8994_IN1L_VU | 0x12 /* 10.5dB */ }, { .mode = RECORDING_REC_MAIN, .reg = WM8994_INPUT_MIXER_3, /* 29h */ .mask = WM8994_IN1L_MIXINL_VOL_MASK | WM8994_MIXOUTL_MIXINL_VOL_MASK, - .gain = 0x0 + .gain = 0x10 /* 30dB */ }, { .mode = RECORDING_REC_MAIN, .reg = WM8994_AIF1_ADC1_LEFT_VOLUME, /* 400h */ .mask = WM8994_AIF1ADC1L_VOL_MASK, - .gain = WM8994_AIF1ADC1_VU | 0xD0 /* +6dB */ + .gain = WM8994_AIF1ADC1_VU | 0xc0 /* +0dB */ }, { .mode = RECORDING_REC_MAIN, .reg = WM8994_AIF1_ADC1_RIGHT_VOLUME, /* 401h */ .mask = WM8994_AIF1ADC1R_VOL_MASK, - .gain = WM8994_AIF1ADC1_VU | 0xD0 /* +6dB */ + .gain = WM8994_AIF1ADC1_VU | 0xc0 /* +0dB */ }, { /* RECOGNITION_HP */ .mode = RECORDING_REC_HP, .reg = WM8994_RIGHT_LINE_INPUT_1_2_VOLUME, /* 1Ah */ .mask = WM8994_IN1R_VOL_MASK, - .gain = WM8994_IN1R_VU | 0x10 + .gain = WM8994_IN1R_VU | 0x12 /* +10.5dB */ }, { .mode = RECORDING_REC_HP, .reg = WM8994_INPUT_MIXER_4, /* 2Ah */ .mask = WM8994_IN1R_MIXINR_VOL_MASK | WM8994_MIXOUTR_MIXINR_VOL_MASK, - .gain = 0x0 + .gain = 0x10 /* +30dB */ }, { .mode = RECORDING_REC_HP, .reg = WM8994_AIF1_ADC1_LEFT_VOLUME, /* 400h */ |