On Apr 25 22:23:21, Jacob Meuser wrote:
> 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?
Well, both mikes do respond to setting
inputs.mic.preamp=off/on
so I suppose either each has its own preamp,
or there is just one mic preamp, pre-amping
the one mike (int/ext) that is currently in use.
> > 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?
nothing, in neither case (int/ext).
> or record.source=line?
silence; only record.source=mic records something.
> > 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?
inputs.mic.source=mic0 is set by default and behaves as described.
inputs.mic.source=mic1 is accepted and results in silence being recorded.
inputs.mic.source=line or line0 or line1 says 'bad enum value'.
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
