HDTenEightyP/NetNews huggingface dataset:
From: tchannon@cix.compulink.co.uk (Tim Channon)
Newsgroups: comp.dsp
Subject: aliasing (was Re: 1 bit DAC on CD)
Date: 7 Apr 92 20:35:22 GMT
Reply-To: Tim Channon <tchannon@cix.compulink.co.uk>
Organization: Gated to News by demon.co.uk

Looks like 2f + DC to me!

TC.
From: dpkemp@afterlife.ncsc.mil (David P. Kemp)
Newsgroups: comp.dsp
Subject: Re: Reading from CD-ROMs to files??
Date: 10 Apr 92 03:06:13 GMT
Organization: The Great Beyond

In article <1992Mar27.190825.22687@nddsun1.sps.mot.com> jas@wdcsps.mot.com (Jaswinder S. Jandu) writes:
>Does anyone know of a way of reading an audio CD and writing
>the digital information to a file (on a SPARC 2)?

It can't be done using the Sun CD ROM drive (without using the 
audio jack and an A/D :-)

I was told by Silicon Graphics that their CD ROM drives have firmware
that allows digital audio to be read in over the SCSI bus, but that
their application software currently doesn't take advantage of that.


-- 
   Dave Kemp   dpkemp@afterlife.ncsc.mil              "Pave the Bay!"
   #include <std/disclaimer>
Newsgroups: alt.binaries.sounds.d,comp.dsp
From: martinjp@cs.washington.edu (John Martin)
Subject: Re: The audio formats guide (version 1.4)
Organization: Computer Science & Engineering, U. of Washington, Seattle
Date: Fri, 10 Apr 92 03:43:22 GMT

Hi:

I am diving into a new project and I need some pointers...

I am will be designing a system that needs to generate a

'sound', where the frequency of the sound depends on a 6-bit

digital value.  I haven't tried to build a system like this before

so any advice will useful.....


thanks

-john
From: aok@rice.berkeley.edu (Alan Kamas)
Newsgroups: comp.dsp
Subject: PTOLEMY:  via FTP and Tape, how to get the software
Date: 17 Apr 1992 19:13:38 GMT
Organization: University of California, Berkeley
Distribution: world
NNTP-Posting-Host: rice.berkeley.edu
Keywords: software tapes ftp site ptolemy

As several people have asked me how to get the Ptolemy software on
tape, I think a posting to the net is necessary.   Here is the 
complete description of how to get Ptolemy on tape or via FTP.  

Note that even if you receive the program via FTP, you may still
want to order a copy of the printed documentation (see below).


- Alan Kamas
  Ptolemy Project Coordinator

----------------------------------------------------------------------

Ptolemy is available *without* support for no charge to organizations 
on the Internet via FTP.  The procedure for obtaining Ptolemy via FTP 
is as follows:

1.   FTP to Internet host "forney.Berkeley.EDU"
     (128.32.240.77).  Login as "anonymous"; no password is
     needed.  Get the shell archive "ptolemy-license.shar".

2.   The "ptolemy-license.shar" file is a bundle of several
     different files and includes instructions on how to
     unbundle them.  Follow these instructions and sign and
     return the enclosed license agreements.

3.   When we receive your signed license agreements, we will
     contact you to give you an account and password that
     will allow you to FTP the actual Ptolemy software.

Organizations without Internet FTP capability can obtain Ptolemy
without support from:

        EECS/ERL Industrial Liaison Program Office
        Software Distribution
        479 Cory Hall
        University of California, Berkeley
        Berkeley, CA 94720
        Attn: Cindy Manly-Fields
        (510) 643-6687

This includes printed documentation, including installation
instructions, a user's guide, and manual pages.  A handling fee (on
the order of $250) will be charged.  

Documentation:
The printed documentation is available separately for ~$30.00 from 
the ILP office at the above address.  Please contact them for the 
exact fee.  Even users who receive Ptolemy via FTP should consider 
ordering the printed documentation as the bound, double-sided volume 
is worth the small fee.
From: gvokalek@augean.eleceng.adelaide.edu.AU (George Vokalek)
Newsgroups: comp.dsp
Subject: Re: : Auto Gain Control with DSP ??
Date: 11 Apr 92 11:10:23 GMT
Organization: Electrical & Electronic Eng., The University of Adelaide

In comp.dsp you write:

>>I'm working on audio-prothesis and i have to implement an Auto Gain Control
>>algorithm using DSP 56000 and using classical analog chip.

Consult:

"On the design, implementation and performance of a microprocessor
controlled fast AGC system for a digital receiver."

by fred harris (yes, all lower case, he likes it that way) and
Gregory Smith.

Presented at Milcom-88, 1988 IEEE Military Communications Conference.

George 

---
George Vokalek,                                Dept. of Mechanical Engineering,
                                           University of Adelaide, GPO BOX 498, 
gvokalek@augean.eleceng.ua.oz.au                 Adelaide 5001, South Australia
From: sholtzcl@digi.lonestar.org (Steve Holtzclaw)
Newsgroups: comp.dsp
Subject: Wanted - sample rate conversion program
Keywords: sample,prgram
Date: 17 Apr 92 15:36:06 GMT
Organization: DSC Communications, Plano Tx.

I am looking for a interpolation/decimation program to do sample rate conversion.
The program should convert the sampling rate of data by factors of L/M where L and M are
arbitrary positive integers. I plan to use this program on a DSP32C and possibly on an 
IBM PC as well.  I have access to a C compiler for both types of processors, so C source
would be preferred.   Help from anyone would be greatly appreciated...
From: moorthy@saturn.ucsc.edu (Harihara Moorthy)
Newsgroups: comp.dsp
Subject: partitioning gray scale images
Date: 13 Apr 92 03:57:35 GMT
Article-I.D.: darkstar.32744
Organization: University of California, Santa Cruz


	I would like to partition an n-by-n gray scale
image (say 8bit gray scale) into a small number of
rectangles (or any other object like polygons) of
constant gray value.

	Can any one suggest good algorithms?
source code will be great, but references will
help too.

Thanks.

H.Moorthy
moorthy@saturn.ucsc.edu
--
 ___    
/ (_)      o     o        ___
| .   _   ___   ___     _|_  \ Harihara SV Moorthy
| |  | | | |  _|_|_   _|_|_  | Univ. of California, Santa Cruz
Newsgroups: comp.dsp
Subject: Auto Gain Control with DSP ??
From: burdet@eig.unige.ch
Date: 8 Apr 92 10:09:37 +0200
Organization: University of Geneva, Switzerland
Nntp-Posting-User: burdet

Hello

I'm working on audio-prothesis and i have to implement an Auto Gain Control
algorithm using DSP 56000 and using classical analog chip.

Does anyone know something about that...

Thanks to post your answer to the net AND to my EMAIL adress
(BURDET@EIG.UNIGE.CH) because I won't be able to read news these next weeks !

Thanks !
From: sjreeves@eng.auburn.edu (Stan Reeves)
Newsgroups: comp.dsp
Subject: Re: partitioning gray scale images
Date: 14 Apr 92 17:58:20 GMT
Organization: Auburn University Engineering

In article <32744@darkstar.ucsc.edu> moorthy@saturn.ucsc.edu (Harihara Moorthy) writes:
>
>	I would like to partition an n-by-n gray scale
>image (say 8bit gray scale) into a small number of
>rectangles (or any other object like polygons) of
>constant gray value.
>
>	Can any one suggest good algorithms?
>source code will be great, but references will
>help too.

See "Image Partition Using an Iterative Multi-Resolution Smoothing
Algorithm," J. Crespo and R. W. Schafer, in Proceedings of the 1992
IEEE International Conference on Acoustics, Speech, and Signal Processing,
vol. III, pp. 561-564.


--
Stan Reeves
Auburn University, Department of Electrical Engineering, Auburn, AL  36849
INTERNET: sjreeves@eng.auburn.edu
From: rkarlqu@hpscit.sc.hp.com (Rick Karlquist)
Date: Fri, 10 Apr 1992 03:47:22 GMT
Subject: Motorola DSP54601 digital audio interface
Organization: Hewlett-Packard, Santa Clara, CA
Newsgroups: comp.dsp

See the March 30 issue of EDN for an announcement of Motorola's
DSP56401 chip which will interface digital audio (both pro
and consumer formats) to the DSP56001 DSP engine.  This topic
is a FAQ in this group.  Price is $25 for samples and immediate
availability is implied.

Rick Karlquist
rkarlqu@scd.hp.com
From: uclydvh@ucl.ac.uk (Mr David John Howells)
Newsgroups: comp.dsp
Subject: Good C compiler for TMS320C25 and TMS320C5x
Date: 14 Apr 92 15:51:24 GMT
Organization: Bloomsbury Computing Consortium, London

I'm after a really good C compiler for the above CPU's.

Does anyone know of/use one?

David
From: psilsbee@ccwf.cc.utexas.edu (Peter Silsbee)
Newsgroups: comp.dsp
Subject: Re: aliasing (was Re: 1 bit DAC on CD)
Date: 13 Apr 92 13:13:36 GMT
Organization: The University of Texas at Austin, Austin TX

In article <1992Apr07.203522.23393@demon.co.uk> Tim Channon <tchannon@cix.compulink.co.uk> writes:
>Looks like 2f + DC to me!
>
>TC.

The point is, 2f is greater than half the sampling frequency. If you 
send the signal through standard D/A hardware, i.e. a converter and a
low-pass filter, you will get DC and 2f/3 (if the original sine wave
had frequency f).

Peter
From: galley@eig.unige.ch
Newsgroups: comp.dsp
Subject: MULTI MC56001, BUS ARBITER WANTED
Date: 7 Apr 92 11:11:14 GMT
Article-I.D.: eig.1992Apr7.131114.1
Organization: University of Geneva, Switzerland
Nntp-Posting-User: galley

I'm designing a multi-DSP card featuring 2 to 8 MC56001. The comunication
between the processors is done using a shared memory. So I've to build an
arbiter.
Does someone know if there is any circuits doing this jobs ?

Thanks

Patrick Galley, student at the Engineering School of Geneva
galley@eig.unige.ch
Xref: sparky comp.dsp:1131 sci.engr.biomed:258 sci.electronics:8530
From: larryd@milton.u.washington.edu (Larry Desoto)
Newsgroups: comp.dsp,sci.engr.biomed,sci.electronics
Subject: Re: Polhemus ISOTRACK/3-SPACE and VIRTUAL REALITY
Date: 15 Apr 92 02:36:51 GMT
Organization: University of Washington

drues@iastate.edu (Michael E Drues) writes:

>In <1992Apr7.031033.19729@njitgw.njit.edu> andrews@rehab.njit.edu (John Andrews) writes:
>>     I am looking at using a 3-SPACE digitizer from Polhemus
>>     (also called ISOTRACK, Kaiser Aerospace) and am looking
>>     for any information on this system or perhaps similar
>>     systems from competing companies.

>I bought one of these systems for my research several months ago.
>It works well but is very sensitive to electronics/metal objects in the
>area.  The software that comesw with it is pretty lame.  You have to 
>write your own code (in C) to use it to do anything useful.  It is being
>used in a variety of applications, not just VR.

>The Isotrak gives location (x,y,z) AND orientation (pitch, roll, yaw) for 
>a total of 6 degrees of freedom.  I don't see how you could get all that
>using ultrasound (especially the 3 angles).

>>     Has anyone any experience with this? Somethign similar?
>>     A better way to locate and track something in 3 dimen-
>>     sions? This system will run me over $10,000, so any and
>>     all responses greatly appreciated.

>No way. The base system (1 source and 1 probe) goes for about $3300.  
>If you ask them right, who can buy a used sytem (same warantee) for half
>that.  

>If you want more info, let me know.

You may want to check out a company called Ascension Technology, P.O.
Box 527, Burlington, VT  05402. Phone (802)655-7879, FAX (802)655-5904.

They also make an electronic 6-degree of freedom tracker.  I used one
of their prototypes for a demo and I give pretty good accuracy.  It 
is also insensitive to large conducting surfaces (I put an aluminum
pop can right in the middle of the setup without problems).  It is 
still sensitive to ferrous material though.


--
Larry                                   |   Thunder makes all the noise;
                                        |   lightning gets the job done.
larryd@milton.washington.edu
I have my opinion; the university has its own.
Newsgroups: comp.dsp
From: sepehr@falstaff.dev.cdx.mot.com (Sepehr Mehranbanzad)
Subject: Re: How to get to Dr. Bub ?
Keywords: DSP, Dr BuB, Motorola, DSP56000, DSP56001
Organization: Motorola Codex, Canton, Massachusetts
Date: Thu, 16 Apr 1992 23:39:36 GMT

In article <sjb3vINN32d@agate.berkeley.edu> izumi@pinoko.berkeley.edu writes:
>In article <1992Apr15.101754.27694@cs.tu-berlin.de> leon@opal.cs.tu-berlin.de (Leon Schmidt (  
>Barmixer )) writes:
>> Please help me, I need application notes for a digital mixing
>> panel. A friend of mine told me to watch out for Dr. Bub and

sorry I can not help you with the FTP site, but I can tell you about the dial-up lines. 
This is right out of the Motorola DSP56000/56001 Reference Material.

"Dr. Bub is the name of the electronic bulletin board dedicated to DSP at Motorola.
This bulletin board offers the DSP community information on Motorola's DSP products,
including:	Current Documentation (new products, improvements to existing
products), Application Notes (new, updates to existing notes), DSP Contest Information,
Question and Answer Forum, and Confidential Mail Service.

A user can dial up Dr. BuB by dialing (512) 440-3771 using a Bell 212A modem or 
(512) 440-3772 using a V.22 modem (it is possible that they have higher speed modems
now, It has been while since I 've called them last).  Be sure you set the character
format to 7 data, even parity, and 1 stop bit.

Use the user name 'guest' and a carriage return for the password. After your successful
login everything should be menu driven. "

I hope this would work for you.


=======================================================================================
Sepehr Mehrabanzad				e-mail:sepehr@falstaff.dev.cdx.mot.com
Signal Processing R&AD Group			v-mail:(617) 821-7523
Motorola/Codex

=======================================================================================
Newsgroups: comp.dsp
From: DSPWorld@world.std.com (Amnon Aliphas)
Subject: Morse Code Recognizer
Followup-To: Looking for Morse Code Recognizer
Organization: The World Public Access UNIX, Brookline, MA
Date: Tue, 7 Apr 1992 14:24:51 GMT



A paper titled:

"A Neural Network Recognizer for Hand Keying Morse Codes"
H. C. Fu, Y. Lin,    National Chiao-Tung University, Taiwan R.O.C.

was presented during the last International Conference on DSP Applications
and Technology - Berlin ' 91 -     Proceedings     pp760-770


From: leichner@hplred.HP.COM (Robert Leichner)
Date: Mon, 13 Apr 1992 17:25:31 GMT
Subject: PC audio card - Recommendations???
Organization: Hewlett Packard Labs, Palo Alto CA
Newsgroups: comp.dsp

        Recommendations needed: audio card for PC

I'm looking for a fairly high-end card (card set?) with the following
general characteristics and would appreciate recommendations from the
net.  In addition, are there particular cards to stay clear of?

1. Codecs for stereo 16-bit samples at programmable sampling rates up
   to 48kHz. Minimum sample rates would be around 5K samples/second.
   Filtering should be appropriate to the sample rate selected.

2. User programmable DSP on card. We would like significant audio DSP
   capability on the card. The DSP will be used for a variety of
   compression algorithms as well as other audio processing. 
   Availability of software tools and existing libraries is critical.
   In particular,  a variety of audio compression algorithms should 
   be available "off the shelf". Floating point would be nice...

3. The card should support high performance I/O to the system disk. We 
   would like some host processor (486) cycles to be available while doing 
   high rate disk transfers. I would hope for software I/O drivers on the 
   PC side of the link.

MANY THANKS IN ADVANCE!

Bob Leichner

Please email replies to leichner@hplabs.hp.com
From: rouet@vlsi.polymtl.ca (Marc Andre Rouet)
Newsgroups: comp.dsp
Subject: Re: algorithms for special effects on sound
Keywords: Sound effects, sound processing.
Date: 8 Apr 92 18:45:15 GMT
Organization: Ecole Polytechnique de Montreal


I am looking for algorithms of popular musical instruments' sound effects
(distorsion, chorus, fazer, flanger, bender, reverb ...)

Can someone suggest me references on that topic ?

Please mail a copy to my mailbox (rouet@info.polymtl.ca)

thanks!

Marc-Andre Rouet
Newsgroups: alt.binaries.sounds.d,comp.dsp
From: lsmichae@immd4.informatik.uni-erlangen.de (Lars Michael)
Subject: Re: The audio formats guide (version 1.4)
Organization: CSD., University of Erlangen, Germany
Date: Tue, 14 Apr 1992 09:14:06 GMT

Hi folx!

I'm *very* interested in info about the sun audio format, but I've
missed the original posting (see topic). Could someone be so kind
and email the guide?

Thanx in advance,
								Larry
---
----------------------------- cut here ------------------------------
----------------------------- cut here ------------------------------
								Larry

+--------------------------------------------+-----------------------+
| lsmichae@faui43.informatik.uni-erlangen.de |  IRC: Pit  (Mr. GIF)  |
|          Lars "Larry" Michael          +---+-----------------------+
| Graduate Student of Computer Science   |  Live's a piece of shit,  |
|  at University of  Erlangen/Germany    |   when you look at it.    |
+----------------------------------------+---------------------------+
Newsgroups: comp.dsp,sci.engr.biomed,sci.electronics
From: bhanafee@deimos.ads.com (Brian Hanafee)
Subject: Re: Polhemus ISOTRACK/3-SPACE and VIRTUAL REALITY
Organization: Advanced Decision Systems, Mountain View, CA 94043, +1 (415)
	960-7300
	<drues.703291186@pv320a.vincent.iastate.edu>
	<1992Apr17.000653.4251@ee.ubc.ca>
Date: Fri, 17 Apr 1992 18:29:01 GMT

In article <1992Apr17.000653.4251@ee.ubc.ca> jthornto@ee.ubc.ca (Johan Thornton) writes:
>In article <drues.703291186@pv320a.vincent.iastate.edu> drues@iastate.edu writes:
>>
>>The Isotrak gives location (x,y,z) AND orientation (pitch, roll, yaw) for 
>>a total of 6 degrees of freedom.  I don't see how you could get all that
>>using ultrasound (especially the 3 angles).
>>
>Actually, it's quite simple.  Using three sound sources located sufficiently far apart
>will tell you the object's location and orientation.  And if you only need the 
>orientation of a plane, two sources are sufficient.

The key difference with the Isotrak, an electromagnetic system, is
that the three sources are co-located on different perpendicular
axes.  The sensor has the same arrangement (reciprocity applies).
Thus, in each sampling cycle, nine measurements are taken to determine
position and location.

--
Brian Hanafee                         Advanced Decision Systems
bhanafee@ads.com                      1500 Plymouth Street
(415) 960-7300                        Mountain View, CA 94043-1230
From: jpcampb@afterlife.ncsc.mil (Joe Campbell)
Newsgroups: comp.dsp
Subject: Re: aliasing (was Re: 1 bit DAC on CD)
Keywords: aliasing
Date: 6 Apr 92 15:09:26 GMT
Organization: The Great Beyond

Peter:
Thanks for all the nice examples of how to digitally create spectral folding.
As you show, there are all sorts of ways to create aliasing via
nonlinear DSP (I believe that I mentioned this as a possibility
previously in this thread).  I see that a low resolution A/D could be
modeled as a high resolution A/D followed by nonlinear DSP (e.g., sign(x))
to simulate the low res A/D and could, therefore, exhibit aliasing.
Unless we're dealing with a multirate system and/or one without a fixed
reconstruction LPF at pi, the maximum freq output is pi and attempting to
exceed pi will result in spectral folding.

I think we pretty much agree on what you wrote.  My original point was that
aliasing does not occur in the D/A process, but during sampling, resampling,
or nonlinear signal processing and, therefore, the D/A's output filter should
be called a "reconstruction filter" instead of an antialiasing filter.
Joe
-- 
.............................................................................
; Joe Campbell  N3JBC  jpcampb@afterlife.ncsc.mil  74040.305@compuserve.com ;
; My opinions are mine!   Happiness = Reality - Expectations, Click & Clack ;
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Newsgroups: comp.dsp
From: news@massey.ac.nz (USENET News System)
Subject: Re: image restoration 
Organization: Massey University
Date: Mon, 13 Apr 92 23:31:11 GMT

In article <1992Apr13.133510.5562@iplmail.orl.mmc.com>, jeanv@iplmail.orl.mmc.com (Jean Vasicek) writes:
> 
> Has anyone tried applying neural nets to solving the inverse problem?
>  
Yes, it is, I believe, a very active area of research. I haven't been 
involved myself. As far as I know, this approach has been taken for
pattern recognition rather than for low level vision.

For example, neral nets have been used to recognise hand written zip-codes.

Terry Moore Massey University
Newsgroups: comp.dsp,sci.engr.biomed,sci.electronics
From: jthornto@ee.ubc.ca (Johan Thornton)
Subject: Re: Polhemus ISOTRACK/3-SPACE and VIRTUAL REALITY
Organization: University of BC, Electrical Engineering
Date: Fri, 17 Apr 1992 00:06:53 GMT

In article <drues.703291186@pv320a.vincent.iastate.edu> drues@iastate.edu writes:
>
>The Isotrak gives location (x,y,z) AND orientation (pitch, roll, yaw) for 
>a total of 6 degrees of freedom.  I don't see how you could get all that
>using ultrasound (especially the 3 angles).
>


Actually, it's quite simple.  Using three sound sources located sufficiently far apart
will tell you the object's location and orientation.  And if you only need the 
orientation of a plane, two sources are sufficient.


-- 
Johan Thornton
(but my friends call me jthornto@ee.ubc.ca)
Newsgroups: comp.dsp
From: jimb@hpmcaa.mcm.hp.com (Jim Belesiu)
Subject: Re: 1 bit DAC on CD
Organization: HP McMinnville - OR
Date: Mon, 06 Apr 1992 17:12:41 GMT


john@anasaz (John Moore) writes:
> 
> For example, consider synthesis of a 10 KHz sine wave with a sampling
> rate of 44 KHz. In our case, we used an 8 bit representation of the
> signal. This quantizing process produces harmonic distortion (it wouldn't
> with an infinite bit representation). This means there are components
> at 20, 30, 40, etc KHz (assuming evens or odds not cancelled). This
> will mix with the sample rate and produce an alias at 4 KHz and 14 KHz.
> It doesn't make any difference how good your LPF is - the mixing has
> occurred before you get to it.
> 
Well not exactly right.  The "harmonic distortion" as it is called here is not
from the the quantization of the signal but from the sampling.  For example
the output from a sample and hold circuit can be consisdered to be an
infinite precision A/D converter.  But if you look at the spectrum you'll
see the original signal's spectrum plus images of the original spectrum
centered around multiples of the sample frequency (or the "harmonics").

Quanitazation can be modeled as a noise added to the signal.  It really
doesn't add distortion although I can't imagine a quantization process
without sampling.


Newsgroups: comp.dsp,sci.engr.biomed,sci.electronics