This is Sampling-rate-question in view mode; [Up]
Date: Sun 14-Mar-1989 18:25:43 From: Unknown Subject: Re: Sampling rate question In article <2884@eos.UUCP> phil@eos.UUCP (Phil Stone) writes: > ... From what I have heard so far, >the highest sampling rate supported (without additional hardware - we need >this now, not 7 months from now!) is 44Khz. Since most of the work in this >field uses 50khz data, this could be a big problem. Metaresearch, Inc has a box that will send 16 bit samples to the DSP port on the cube. The box, named "Digital Ears," can apparently sample at 44.1kHz in stereo or 88.2kHz in mono. I hope this will be enough for what you want to do. Availability is "March 1989." For more info contact: Metaresearch Inc, 516SE Morrison Suite M-1, Portland, OR 97214 I don't know any more about this box; please contact the above address for details. Ali Ozer >From: jasmerb@mist.cs.orst.edu (Bryce Jasmer)
Date: Sun 15-Mar-1989 03:09:17 From: Unknown Subject: Re: Sampling rate question 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 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 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 >From: phil@eos.UUCP (Phil Stone)
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