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| mixer_settings [2012/01/22 07:50] – created paulf | mixer_settings [2012/02/03 23:03] – Add other usecases paulf |
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| Understanding it doesn't require any special knowledge, here's a short legend: | Understanding it doesn't require any special knowledge, here's a short legend: |
| * ''DAC'' is [[http://en.wikipedia.org/wiki/Digital-to-analog_converter|Digital to Analog Converter]], ''DACs'' module gets digital stereo signal via ''I2S'' bus from the CPU and the ''VoiceDAC'' module gets mono signal from a digital microphone (placed somewhere inside near the webcam) | * ''DAC'' is [[http://en.wikipedia.org/wiki/Digital-to-analog_converter|Digital to Analog Converter]], ''DACs'' module gets digital stereo signal via ''I2S'' bus from the CPU (''VoiceDAC'' module is left unconnected an ac100) |
| * ''ADC'' does the reverse and can be used to convert sound from inputs to digital form which is then sent over ''I2S'' to the CPU | * ''ADC'' does the reverse and can be used to convert sound from inputs to digital form which is then sent over ''I2S'' to the CPU |
| | * DMIC is a digital microphone, connected to special pins of the integrated webcam |
| * A triangle on the diagram means a sound amplifier | * A triangle on the diagram means a sound amplifier |
| * A square marked ''Vol'' is an [[http://en.wikipedia.org/wiki/Attenuator_(electronics)|attenuator]] that a user can tweak to reduce the volume of the signal | * A square marked ''Vol'' is an [[http://en.wikipedia.org/wiki/Attenuator_(electronics)|attenuator]] that a user can tweak to reduce the volume of the signal |
| * ''DACR2HP Playback Switch'' | * ''DACR2HP Playback Switch'' |
| * ''Int Spk'' | * ''Int Spk'' |
| | * ''Speaker Playback Switch'' (i.e. unmute ''Speaker'') |
| Should be set: | Should be set: |
| * ''SpeakerOut Mux'' to ''HPOut Mix'' | * ''SpeakerOut Mux'' to ''HPOut Mix'' |
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| Proper mono sound via MONO mixer or Speaker mixer is impossible to produce on unmodified hardware, see [[hw_problems#reversed_polarity_of_one_of_the_integrated_speakers]] for details. Luckily most usage scenarios do not require that anyway. You can swap polarity of connection of one of the speakers but then ''RN/-R'' would need to be used for the stereo output. | Proper mono sound via MONO mixer or Speaker mixer is impossible to produce on unmodified hardware, see [[hw_problems#reversed_polarity_of_one_of_the_integrated_speakers]] for details. Luckily most usage scenarios do not require that anyway. You can swap polarity of connection of one of the speakers but then ''RN/-R'' would need to be used for the stereo output. |
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| | ==== Stereo playback on headphones ==== |
| | Same as stereo playback on integrated speakers but with |
| | Enabled: |
| | * ''Headphone Playback Switch'' (i.e. unmute ''Headphone'') |
| | Set: |
| | * ''Left Headphone Mux'' to ''HP Left Mix'' |
| | * ''Right Headphone Mux'' to ''HP Right Mix'' |
| | |
| | To mute the internal speakers you can disable ''Int Spk'' or mute ''Speaker''. |
| | |
| | ==== Recording sound from integrated DMIC ==== |
| | This can be used to record sound from the digital microphone integrated in the webcam module, useful for e.g. VoIP |
| | Selected for capture: |
| | * ''DMIC En Capture Switch'' |
| | * ''DMIC PreFilter Capture Switch'' |
| | * ''DMICL Mix DMICL2ADC Capture Switch'' |
| | Set: |
| | * ''I2SOut Mux'' to ''ADC LR'' |
| | Tweak ''DMIC Boost Volume'' and ''Rec Capture Volume'' to your needs. |
| | |
| | ==== Recording from external microphone ==== |
| | Selected for capture: |
| | * ''Left Capture Mix MIC12REC_L Capture Switch'' |
| | Tweak ''Mic 1 Boost Volume'', ''Mic1 Capture Volume'' and ''Rec Capture Volume'' to your needs. |
