On Sat, Apr 25, 2009 at 01:15:33PM +0200, Jan Stary wrote:
> Hi all,
>
> I am doing some trivial sound-recording on my Compaq Armada 110 laptop
> (dmesg and mixerctl below). The sound device is
>
> auvia0 at pci0 dev 7 function 5 "VIA VT82C686 AC97" rev 0x20: irq 9
> audio0 at auvia0
for ac97 devices, the codec is also very important. although the
AD1881A looks pretty standard. no jack sense or anything.
> and it works without problems.
>
> Now, the laptop has an internal microphone - that tiny little hole
> you have seen on some laptops. It records fine, set up as
>
> inputs.mic=255
> inputs.mic.mute=off
> inputs.mic.preamp=on
> inputs.mic.source=mic0
> record.source=mic
>
> The laptop also has an input for an external mike (the usual small jack,
> just next to the headphones output). When you plug in an external mike,
> the audio chip is smart enough to record from that one, and no longer
> record from the internal mike. (I use Shure SM57 as the external mike,
> which I believe is irrelevant.) Recording with the external mike plugged
> in works fine too, EXCEPT the signal level from the external mike is
> much weaker, and I wonder why.
maybe there is a separate preamp on the internal mic pin?
> Can it be that the (one) audio input the laptop has is meant as an
> "universal" audio input for both mic and line-in, expecting a much
> stronger signal?
maybe ... what does inputs.line* affect? or record.source=line?
> For the internal mike, having
>
> inputs.mic.preamp=off/on
>
> makes a difference of recording just fine vs. recording a dog barking
> two blocks away. With the external mike, it makes a difference of
> barely audible recording vs. fine recording. With headphones on,
> you can hear the signal strength drop when you plug in the external
> mike.
does changing inputs.mic.source have any effect?
> Thanks
>
> Jan
>
>
> OpenBSD 4.4-stable (GENERIC) #0: Sun Mar 8 18:49:45 CET 2009
> r...@armada.stare.cz:/usr/src/sys/arch/i386/compile/GENERIC
> cpu0: Intel Pentium III ("GenuineIntel" 686-class, 128KB L2 cache) 847 MHz
> cpu0:
> FPU,V86,DE,PSE,TSC,MSR,PAE,MCE,CX8,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,MMX,FXSR,SSE
> real mem = 259551232 (247MB)
> avail mem = 242520064 (231MB)
> User Kernel Config
> UKC> disable acpi
> 429 acpi0 disabled
> UKC> enable apm
> 330 apm0 enabled
> UKC> quit
> Continuing...
> mainbus0 at root
> bios0 at mainbus0: AT/286+ BIOS, date 08/20/01, BIOS32 rev. 0 @ 0xfd720,
> SMBIOS rev. 2.3 @ 0xe9f90 (17 entries)
> bios0: vendor Phoenix Technologies LTD version "0F08" date 08/20/2001
> bios0: Compaq 110 series
> apm0 at bios0: Power Management spec V1.2
> apm0: AC on, battery charge unknown
> acpi at bios0 function 0x0 not configured
> pcibios0 at bios0: rev 2.1 @ 0xfd720/0x8e0
> pcibios0: PCI IRQ Routing Table rev 1.0 @ 0xfdf70/112 (5 entries)
> pcibios0: PCI Interrupt Router at 000:07:0 ("VIA VT82C596A ISA" rev 0x00)
> pcibios0: PCI bus #2 is the last bus
> bios0: ROM list: 0xc0000/0xc000 0xcc000/0x1800
> cpu0 at mainbus0
> pci0 at mainbus0 bus 0: configuration mode 1 (no bios)
> pchb0 at pci0 dev 0 function 0 "VIA VT8601 PCI" rev 0x05
> ppb0 at pci0 dev 1 function 0 "VIA VT82C601 AGP" rev 0x00
> pci1 at ppb0 bus 1
> vga1 at pci1 dev 0 function 0 "Trident CyberBlade i1 AGP" rev 0x6a
> wsdisplay0 at vga1 mux 1: console (80x25, vt100 emulation)
> wsdisplay0: screen 1-5 added (80x25, vt100 emulation)
> agp0 at vga1: v2, aperture at 0xf8000000, size 0x10000000
> drm at vga1 unsupported
> pcib0 at pci0 dev 7 function 0 "VIA VT82C686 ISA" rev 0x22
> pciide0 at pci0 dev 7 function 1 "VIA VT82C571 IDE" rev 0x10: ATA66, channel
> 0 configured to compatibility, channel 1 configured to compatibility
> wd0 at pciide0 channel 0 drive 0: <IC25N015ATDA04-0>
> wd0: 16-sector PIO, LBA, 14403MB, 29498112 sectors
> wd0(pciide0:0:0): using PIO mode 4, Ultra-DMA mode 4
> atapiscsi0 at pciide0 channel 1 drive 0
> scsibus0 at atapiscsi0: 2 targets, initiator 7
> cd0 at scsibus0 targ 0 lun 0: <QSI, CD-ROM SCR-242, CCA1> ATAPI 5/cdrom
> removable
> cd0(pciide0:1:0): using PIO mode 4, DMA mode 2
> uhci0 at pci0 dev 7 function 2 "VIA VT83C572 USB" rev 0x10: irq 11
> viaenv0 at pci0 dev 7 function 4 "VIA VT82C686 SMBus" rev 0x30: HWM disabled:
> 24-bit timer at 3579545Hz
> auvia0 at pci0 dev 7 function 5 "VIA VT82C686 AC97" rev 0x20: irq 9
> ac97: codec id 0x41445348 (Analog Devices AD1881A)
> ac97: codec features headphone, Analog Devices Phat Stereo
> audio0 at auvia0
> fxp0 at pci0 dev 9 function 0 "Intel 8255x" rev 0x09, i82559S: irq 11,
> address 00:d0:59:80:c6:e5
> inphy0 at fxp0 phy 1: i82555 10/100 PHY, rev. 4
> "AT&T/Lucent LTMODEM" rev 0x00 at pci0 dev 9 function 1 not configured
> cbb0 at pci0 dev 10 function 0 "TI PCI1410 CardBus" rev 0x01: irq 11
> isa0 at pcib0
> isadma0 at isa0
> com0 at isa0 port 0x3f8/8 irq 4: ns16550a, 16 byte fifo
> com1 at isa0 port 0x2f8/8 irq 3: ns16550a, 16 byte fifo
> pckbc0 at isa0 port 0x60/5
> pckbd0 at pckbc0 (kbd slot)
> pckbc0: using irq 1 for kbd slot
> wskbd0 at pckbd0: console keyboard, using wsdisplay0
> pms0 at pckbc0 (aux slot)
> pckbc0: using irq 12 for aux slot
> wsmouse0 at pms0 mux 0
> pcppi0 at isa0 port 0x61
> midi0 at pcppi0: <PC speaker>
> spkr0 at pcppi0
> lpt0 at isa0 port 0x378/4 irq 7
> npx0 at isa0 port 0xf0/16: reported by CPUID; using exception 16
> fdc0 at isa0 port 0x3f0/6 irq 6 drq 2
> fd0 at fdc0 drive 0: 1.44MB 80 cyl, 2 head, 18 sec
> usb0 at uhci0: USB revision 1.0
> uhub0 at usb0 "VIA UHCI root hub" rev 1.00/1.00 addr 1
> cardslot0 at cbb0 slot 0 flags 0
> cardbus0 at cardslot0: bus 2 device 0 cacheline 0x0, lattimer 0x20
> pcmcia0 at cardslot0
> biomask ed65 netmask ed65 ttymask fdff
> mtrr: Pentium Pro MTRR support
> wi0 at pcmcia0 function 0 "Wireless, LAN Adapter, Version 01.02" port
> 0xa000/64
> wi0: PRISM2.5 ISL3873 (0x800c), Firmware 1.1.1 (primary), 1.8.4 (station),
> address 00:e0:98:a9:65:af
> umass0 at uhub0 port 1 configuration 1 interface 0 "Prolific Technology Inc.
> Mass Storage Device" rev 2.00/1.00 addr 2
> umass0: using SCSI over Bulk-Only
> scsibus1 at umass0: 2 targets, initiator 0
> sd0 at scsibus1 targ 1 lun 0: <ST980815, A, 3.AL> SCSI0 0/direct fixed
> sd0: 76319MB, 9729 cyl, 255 head, 63 sec, 512 bytes/sec, 156301488 sec total
> softraid0 at root
> root on wd0a swap on wd0b dump on wd0b
>
> outputs.master=231,231
> outputs.master.mute=off
> outputs.mono=255
> outputs.mono.mute=on
> outputs.mono.source=mixerout
> outputs.headphones=255,255
> outputs.headphones.mute=off
> inputs.speaker=15
> inputs.speaker.mute=on
> inputs.phone=191
> inputs.phone.mute=on
> inputs.mic=255
> inputs.mic.mute=off
> inputs.mic.preamp=on
> inputs.mic.source=mic0
> inputs.line=7,7
> inputs.line.mute=on
> inputs.cd=7,7
> inputs.cd.mute=on
> inputs.video=191,191
> inputs.video.mute=on
> inputs.aux=7,7
> inputs.aux.mute=on
> inputs.dac=231,231
> inputs.dac.mute=off
> record.source=mic
> record.volume=255,255
> record.volume.mute=off
> outputs.spatial=off
> outputs.spatial.center=0
> outputs.spatial.depth=0
> outputs.extamp=off
>
--
jake...@sdf.lonestar.org
SDF Public Access UNIX System - http://sdf.lonestar.org
