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
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.
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?
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.
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
