sjm@cs.purdue.EDU (Scott J Mark) (08/30/89)
In the graphics users' manual, under the section on porting applications to the Personal IRIS, it mentions that the Personal IRIS has a sound chip. I haven't been able to find any other information on whether this chip indeed exists, and how to use it if it does. We have a complete set of manuals, but no index has an entry for "sound." Can anyone clear this up please? Scott -- sjm@cs.purdue.edu
msc@ramoth.esd.sgi.com (Mark Callow) (08/31/89)
In article <7783@medusa.cs.purdue.edu>, sjm@cs.purdue.EDU (Scott J Mark) writes: > > In the graphics users' manual, under the section on porting > applications to the Personal IRIS, it mentions that the Personal IRIS > has a sound chip. I haven't been able to find any other information > on whether this chip indeed exists, and how to use it if it does. > We have a complete set of manuals, but no index has an entry > for "sound." Can anyone clear this up please? The sound chip exists on all Personal Irises. The only documentation is the man page for the driver /dev/audio. You will need to get a speaker and microphone. The PI has miniature audio jacks in the back. -- -Mark
SERRER@nrcm3.nrc.ca (Martin Serrer - Systems Manager) (08/31/89)
Hi, Scott Mark of Department of Computer Science, Purdue University writes... > In the graphics users' manual, under the section on porting >applications to the Personal IRIS, it mentions that the Personal IRIS >has a sound chip. I haven't been able to find any other information >on whether this chip indeed exists, and how to use it if it does. > We have a complete set of manuals, but no index has an entry >for "sound." Can anyone clear this up please? Try looking in the back of the IRIS-4D System Administrators Reference Manual Section 1M -Section 7 in the special files section under AUDIO(7) The description is somewhat terse and lacking in examples but there is something there. Now if SGI would only document the AUDIO channel on my 4D50 processor card... Martin +------------------------------------------------------------------------------+ | Martin Serrer - Systems Munger | | | +---+ /----\ | | Systems Laboratory, Bldg. M-3 RM.118 | |\ | | | | \ | | Division of Mechanical Engineering | | \ | | | | | | National Research Council of Canada | | \ | |---+ | | | Ottawa, Ontario, Canada K1A-0R6 | | \ | | \ | | | serrer@syslab.nrc.ca (BITNET) | | \| | \ | / | | (613) 993-9442 (Bell) | | | | \ \----/ | +------------------------------------------------------------------------------+ + Software Rusts... Rust never Sleeps... + +------------------------------------------------------------------------------+
tim@zorac.dciem.dnd.ca (Tim Pointing) (08/31/89)
> The sound chip exists on all Personal Irises. The only documentation is > the man page for the driver /dev/audio. You will need to get a speaker > and microphone. The PI has miniature audio jacks in the back. Does anybody have any info on things like leves and impedences for these jacks or are they some "standard"? Thanks in advance, Tim Pointing, DCIEM {decvax,attcan,watmath,...}!utzoo!dciem!tim uunet!csri.toronto.edu!dciem!tim or nrcaer!dciem!tim tim@ben.dciem.dnd.ca or tim@zorac.dciem.dnd.ca
wiltse@oceana.esd.sgi.com (Wiltse Carpenter) (09/01/89)
In article <7783@medusa.cs.purdue.edu>, sjm@cs.purdue.EDU (Scott J Mark) writes: > > In the graphics users' manual, under the section on porting > applications to the Personal IRIS, it mentions that the Personal IRIS > has a sound chip. I haven't been able to find any other information > on whether this chip indeed exists, and how to use it if it does. > We have a complete set of manuals, but no index has an entry > for "sound." Can anyone clear this up please? It's under ``audio'' in section 7 of the IRIS 4D Programmer's Reference Manual. Type: man audio. -Wiltse
rae%alias@csri.utoronto.ca (Reid Ellis) (09/01/89)
Look up /dev/audio. For fun, hook up a mike and some speakers, and type "cat /dev/audio > file" and talk into the mike. When you're finished, hit interrupt [^C, DEL, whatever], and then type "cat file > /dev/audio". Note that the mike and speakers should be heavily shielded. And the speakers should probably be on a ghetto blaster since you use 'line out' jacks. Reid --- Reid Ellis, 264 Broadway Avenue, Toronto ON, M4P 1V9, Canada rae%alias@csri.utoronto.ca, rae@geac.uucp, rae@ziebmef.uucp, rae@gpu.utcs.utoronto.ca, rae@tnir.uucp +1 416 487 1383
sanjay@nirvana.esd.sgi.com (Sanjay Iyer) (09/07/89)
In article <8908311403.AA05313@zorac.DCIEM.DND.CA>, tim@zorac.dciem.dnd.ca (Tim Pointing) writes: > > The sound chip exists on all Personal Irises. The only documentation is > > the man page for the driver /dev/audio. You will need to get a speaker > > and microphone. The PI has miniature audio jacks in the back. > > Does anybody have any info on things like leves and impedences for these > jacks or are they some "standard"? This ought to help: PERSONAL IRIS AUDIO I/O INFORMATION Line input: +/- 2.5 v (input is AC coupled) is full scale to ADC ADC is 8-bit, 2's complement Input impedance is 22K ohms. Input gains not adjustable. Frequency response: 20 Hz - 13 KHz @ 32K/sec sampling rate 20 Hz - 6.6 KHz @ 16K/sec sampling rate 20 Hz - 3.3 KHz @ 8K/sec sampling rate Microphone input: +/- 3.8 mv (input is AC coupled) is full scale to ADC ADC is 8-bit, 2's complement Input impedance 330 ohms. Designed for use with 300 ohm microphone. Input is summed (analog) with line input. Output: With full output gain (0xff) and no load, output swings +/- 4.9 v. Reduced output gain linearly reduces swing. Output is AC coupled (~4 ohms in series with 220 uf). Can directly drive 8 ohm speaker. (By the way there is no single sound chip; the audio circuit is composed of a combined ADC-DAC, another DAC for output gain control, a switched-capacitor filter, and misc amps).