Circuit Cellar Ink 61
August 1995

Table of Contents

2 Ken Davidson	Editor's INK Digital Sound Processing
6	Reader's INK Letters to the Editor
8 Harv Weiner	New Product News
14 Do-While Jones	Digital Filter Alchemy Turning Circuits into Code Do-While assumes you've picked your microprocessor and hardware circuitry. He just wants to help you with the digital-filtering techniques. He offers closeups on actual digital-filter implementation.
24 Sebastien Roy	Speech Compression Techniques and the CDV-1 Digital Voice Box None of the methods for storing digitally recorded speech met project needs. After summarizing verious methods, Sebastien refines the companded differential PCM method, a solution which fit the bill.
34 Matt Park	Real-Time Digital Signal Processing with a PC and Sound Card A Windows-compatible sound card and a 486 PC are all you need to experiment with real-time digital signal processing. Here, Matt introduces us to Digitize, a real-time software DSP alternative. Download: DIGIT1_1.ZIP DIGIT_SC.ZIP
42 Eric Ambrosino	PC-based Equalizer Multimedia on the PC has given new dimensions to the importance of PC sound. In this article, Eric presents an equalizer with a graphical interface comparable to what you would find on a home stereo. Download: PCEQ.ZIP
50 Paul Rubinfeld	Digital's Alpha 21164: Performance Drives Design Choices With the Alpha chip, Digital blew open the desktop computing world. In this article, Paul specifically looks at how Alpha achieves its high performance. As with much of life, it appears that cache is the secret.
56 Ed Nisley	Firmware Furnace Journey to the Protected Land: Of Characters and Keystrokes Continuing last month's keyboard discussion, Ed set out to convert Scan Code Set 3 codes into those expected by the real-mode BIOS. He also looks at how the numerous shift keys are handled.
64 Jeff Bachiochi	From the Bench Decontaminating the Atmosphere FCC testing may strike fear in the hearts of engineers, but going in armed with the knowledge that you've done your own pretesting can be a comfort. Jeff checks out some inexpensive EMI probes that can help.
70 Tom Cantrell	Silicon Update PLDCONfusion A PAL is a PAL, right? Not these days. Programmable logic has taken off, and with it comes many of the same dilemmas faced when trying to select a microprocessor. Tom tries to make some sense of the confusion.
76 John Dybowski	Embedded Techniques Power Managment with the DS87C530: Part 1: The Hardware Instead of regulating power by turning the micro on and off, the DS87C530 can drop into a virtual zero-power state by shunting its minimal activities to internal oscillators. Even its real-time clock can go into an almost no-power mode.
81	Advertiser's Index
84 Ken Davidson	ConnecTime -- Excerpts from the Circuit Cellar BBS
96 Steve Ciarcia	Steve's Own INK Under the Covers

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