Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!iuvax!rutgers!orstcs!mist!jasmerb
From: jasmerb@mist.cs.orst.edu (Bryce Jasmer)
Newsgroups: comp.sys.next
Subject: Re: Sampling rate question
Message-ID: <9433@orstcs.CS.ORST.EDU>
Date: 15 Mar 89 03:09:17 GMT
References: <2884@eos.UUCP> <7699@polya.Stanford.EDU>
Sender: usenet@orstcs.CS.ORST.EDU
Reply-To: jasmerb@mist.UUCP (Bryce Jasmer)
Organization: Oregon State University - CS - Corvallis, Oregon
Lines: 95

I found this at the anonymous ftp site at Oregon State University
(cs.orst.edu in the directory ~ftp/pub/next/announcements):

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

NeXT IS PLEASED TO ANNOUNCE THE FIRST 3RD PARTY HARDWARE PRODUCT

PRODUCT NAME: Digital Ears

MODEL: Audio Input Device DE-1

OVERVIEW

The Digital Ears(TM) audio input device provides the means to record
compact disk quality sound on the NeXT(TM) computer.  The DE-1 accepts
stereo line input form any source, including CD players, tape decks and
studio mixing consoles.  In addition, DE-1 can quantize laboratory
signals down to DC, allowing for high precision measurements.  Signals
are converted to true compact disk format, 16 bit, 44.1 kHz stereo.
This information is then sent to the Digital Signal Processor (DSP)
port on the NeXT computer.  The DE-1 is a stand-alone device, drawing
its power from the DSP port.

APPLICATIONS

The Digital Ears device is suitable for creating disk sound files in
standard NeXT format.  These sounds files can be used within
developers' applications.  Example applications are:

   o Low cost, high quality digital recording studio
   o Voice and speech analysis
   o Inclusion of sound in application interfaces
   o Quantization of laboratory data (DC mode)
   o Harmonic and signal analysis

FEATURES

   o True CD quality format (16 bit, 44.1 kHz stereo)
   o Deposits sound information onto disk via the DSP
   o Draws power form the DSP port
   o Self-calibrating A/D converter
   o Stereophonic and monaural recording modes
   o Input level gain adjust for each channel
   o accurate DC response in DC mode

OPERATING MODES

   o Stereo/Monaural:  The DE-1 can act as either a stereo or monaural
     recording device.  If used in monaural mode, over-sampling occurs at
     double stereo rate.

   o AC/DC: Determines whether to input either AC (audio) or DC signals
     into the NeXT.  The mode is selected with an internal jumper.

   o Variable Input Gain: 0 to 10X, independent channel adjustments.

TECHNICAL SPECIFICATIONS

Frequency Response            DC-19 kHz (-3db)
Sampling Rate (stereo)        44.1 kHz
Signal to Noise Ratio         +98db
Total Harmonic Distortion     -90db
A/D Input Voltage Range       +/-5.0 V
Input Impedance               100k Ohms
Gain Stage Noise Equivalent   24 nV/Hz, @10Hz
                              8 nV/Hz, >1kHz
Linearity Error (DC mode)     +/- LSB (4 parts in 65,000)

ORDERING INFORMATION

The Digital Ears package, order number DE-1 includes:

   o Digital Ears audio input device
   o DSP connector cable
   o Input level adjustment screwdriver
   o User manual

SUPPLIER

Metaresearch, Incorporated
516 SE Morrison
Portland, Oregon 97214
(503) 238-5728
Contacts:  Kim Orumchian or Lee Buhler

COST: $825.00
 
Digital Ears and DE-1 are trademarks of Metaresearch, Incorporated.  NeXT
is a registered trademark of NeXT, Incorporated.


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

Bryce Jasmer
jasmerb@hobbes.cs.orst.edu