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DAC+ Erläuterungen zu den verschiedenen Alsa-Controls

Hallöle,

erfreue mich gerade an meinem Neuen RPi 2B und DAC+ über mein 50'er Jahre Röhrenradio ... cool.

Allerdings habe ich nirgendwo etwas Doku zu den vielen Alsa-Controls gefunden ... und da gibt es ja reichlich ... lediglich zwei der Einstellungen erschließen mich mir sofort (s.u. Kommentare in Fett), der Rest klingt wie böhmische Dörfer.

Kann mir jemand nettweise dazu etwas Hintergrund geben?

Simple mixer control 'PCM',0
Capabilities: volume penum

... das ist selbstredend die Lautstärke

Simple mixer control 'DSP Program',0
Capabilities: enum
Items: 'FIR interpolation with de-emphasis' 'Low latency IIR with de-emphasis' 'High attenuation with de-emphasis' 'Fixed process flow' 'Ringing-less low latency FIR'

Simple mixer control 'Playback',0
Capabilities: volume penum
Playback channels: Front Left - Front Right
Capture channels: Front Left - Front Right
Limits: 0 - 1
Front Left: 0 [0%] [-6.00dB]
Front Right: 0 [0%] [-6.00dB]

... hiermit kann ich den Output Level anpassen, auch klar ...

Simple mixer control 'Playback Boost',0
Capabilities: volume penum
Playback channels: Front Left - Front Right
Capture channels: Front Left - Front Right
Limits: 0 - 1
Front Left: 0 [0%] [0.00dB]
Front Right: 0 [0%] [0.00dB]

Simple mixer control 'Auto Mute',0
Capabilities: pswitch penum

Simple mixer control 'Auto Mute Mono',0
Capabilities: pswitch pswitch-joined penum
Playback channels: Mono

Simple mixer control 'Auto Mute Time Left',0
Capabilities: enum
Items: '21ms' '106ms' '213ms' '533ms' '1.07s' '2.13s' '5.33s' '10.66s'

Simple mixer control 'Auto Mute Time Right',0
Capabilities: enum
Items: '21ms' '106ms' '213ms' '533ms' '1.07s' '2.13s' '5.33s' '10.66s'

Simple mixer control 'Clock Missing Period',0
Capabilities: enum
Items: '1s' '2s' '3s' '4s' '5s' '6s' '7s' '8s'

Simple mixer control 'Deemphasis',0
Capabilities: pswitch pswitch-joined penum
Playback channels: Mono
Mono: Playback [on]

Simple mixer control 'Digital',0
Capabilities: pswitch penum
Playback channels: Front Left - Front Right

Simple mixer control 'Volume Ramp Down Emergency Rate',0
Capabilities: enum
Items: '1 sample/update' '2 samples/update' '4 samples/update' 'Immediate'

Simple mixer control 'Volume Ramp Down Emergency Step',0
Capabilities: enum
Items: '4dB/step' '2dB/step' '1dB/step' '0.5dB/step'

Simple mixer control 'Volume Ramp Down Rate',0
Capabilities: enum
Items: '1 sample/update' '2 samples/update' '4 samples/update' 'Immediate'

Simple mixer control 'Volume Ramp Down Step',0
Capabilities: enum
Items: '4dB/step' '2dB/step' '1dB/step' '0.5dB/step'

Simple mixer control 'Volume Ramp Up Rate',0
Capabilities: enum
Items: '1 sample/update' '2 samples/update' '4 samples/update' 'Immediate'

Simple mixer control 'Volume Ramp Up Step',0
Capabilities: enum
Items: '4dB/step' '2dB/step' '1dB/step' '0.5dB/step'

1000 Dank!

Hegi.

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