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Old 05-07-2012, 07:15 AM
Lone Learner
 
Default Why does Audacity show me internal mics: "Internal Mic: 0" and "Internal Mic: 1"?

I have AlsaMixer v1.0.24.2 and if I press F6 to select sound card after running alsamixer, I get two options:
* - *(default)* 0 *HDA Intel
If I select "- (default)", the card name and chip name are displayed as "PulseAudio" in the top left corner. If I select "HDA Intel" the card name is displayed as "HDA Intel" and chip name is displayed as "Realtek ACL268".

When I launch Audacity 1.3.14-beta (Unicode), I see the following options for each pulldown menu.
Audio Host:
* ALSA* OSS

Output Device (when ALSA is selected as audio host):
* pulse* default
Input Device (when ALSA is selected as audio host):
* HDA Intel: ALC268 Analog (hw:0,0)
* HDA Intel: ALC268 Analog (hw:0,2): Mic:0* HDA Intel: ALC268 Analog (hw:0,2): Internal Mic:0* HDA Intel: ALC268 Analog (hw:0,2): Line:0* HDA Intel: ALC268 Analog (hw:0,2): Mic:1
* HDA Intel: ALC268 Analog (hw:0,2): Internal Mic:1* HDA Intel: ALC268 Analog (hw:0,2): Line:1* pulse: Mic:0* pulse: Internal Mic:0* pulse: Line:0* pulse: Mic:1
* pulse: Internal Mic:1* pulse: Line:1* default: Mic:0* default: Internal Mic:0* default: Line:0* default: Mic:1* default: Internal Mic:1* default: Line:1

I can set the input device to any one of the following and record my voice successfully:
* pulse: Internal Mic:0* pulse: Internal Mic:1* default: Internal Mic:1
* default: Internal Mic:1
But if I set the input device to anything else, I can't record my voice. *I want to know why I have got two internal mics? As far as I know, my laptop has got only one internal mic. Why do I see two in Audacity?

Here is some more output. I hope it will help you to answer my questions. If you need more output, please tell me.
lone@learner:~$ arecord -l**** List of CAPTURE Hardware Devices ****
card 0: Intel [HDA Intel], device 0: ALC268 Analog [ALC268 Analog]* Subdevices: 0/1* Subdevice #0: subdevice #0card 0: Intel [HDA Intel], device 2: ALC268 Analog [ALC268 Analog]
* Subdevices: 1/1* Subdevice #0: subdevice #0
lone@learner:~$ arecord -Ldefault* * Playback/recording through the PulseAudio sound serverpulse
* * Playback/recording through the PulseAudio sound serverfront:CARD=Intel,DEV=0* * HDA Intel, ALC268 Analog* * Front speakerssurround40:CARD=Intel,DEV=0* * HDA Intel, ALC268 Analog
* * 4.0 Surround output to Front and Rear speakerssurround41:CARD=Intel,DEV=0* * HDA Intel, ALC268 Analog* * 4.1 Surround output to Front, Rear and Subwoofer speakerssurround50:CARD=Intel,DEV=0
* * HDA Intel, ALC268 Analog* * 5.0 Surround output to Front, Center and Rear speakerssurround51:CARD=Intel,DEV=0* * HDA Intel, ALC268 Analog* * 5.1 Surround output to Front, Center, Rear and Subwoofer speakers
surround71:CARD=Intel,DEV=0* * HDA Intel, ALC268 Analog* * 7.1 Surround output to Front, Center, Side, Rear and Woofer speakers
lone@learner:~$ aplay -l**** List of PLAYBACK Hardware Devices ****
card 0: Intel [HDA Intel], device 0: ALC268 Analog [ALC268 Analog]* Subdevices: 0/1* Subdevice #0: subdevice #0
lone@learner:~$ aplay -Ldefault* * Playback/recording through the PulseAudio sound server
pulse* * Playback/recording through the PulseAudio sound serverfront:CARD=Intel,DEV=0* * HDA Intel, ALC268 Analog* * Front speakerssurround40:CARD=Intel,DEV=0
* * HDA Intel, ALC268 Analog* * 4.0 Surround output to Front and Rear speakerssurround41:CARD=Intel,DEV=0* * HDA Intel, ALC268 Analog* * 4.1 Surround output to Front, Rear and Subwoofer speakers
surround50:CARD=Intel,DEV=0* * HDA Intel, ALC268 Analog* * 5.0 Surround output to Front, Center and Rear speakerssurround51:CARD=Intel,DEV=0* * HDA Intel, ALC268 Analog
* * 5.1 Surround output to Front, Center, Rear and Subwoofer speakerssurround71:CARD=Intel,DEV=0* * HDA Intel, ALC268 Analog* * 7.1 Surround output to Front, Center, Side, Rear and Woofer speakers
 

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