The Buzz: 20 Years Ago in
Sound & Video Contractor
Sep 1, 2005 12:00 PM, By Mark Johnson
Reverberating with Digital Delay
The September 1985 issue focused on digital delay and reverberation and included articles written by Richard C. Cabot, Keith Worsley, and D.B. Keele, three individuals well known in their fields of expertise.
Cabot kicked it off with “A Closer Look at Digital Delay and Reverberation,” in which he defined some of the terminology, provided an in-depth look at the current state of technology, and gave an idea about what the future held.
Following up with the practical aspects, Keith Worsley contributed “Achieving Naturalness with Digital Delay” detailing how incorporating a digital delay can help to improve intelligibility and localization of the sound source. Worsley also provided “The Multipurpose Hall and Digital Reverberation,” in which he discussed the application of digital reverberations and delay devices for ambience in multipurpose venues. At the time, Worsley was the national sales manager for Klark Teknik.
Industry notable D.B. Keele authored “TDS: Application of Technology,” in which he explained what Time Delay Spectrometry (TDS) was and reviewed some of the advantages and disadvantages of applying TDS acoustical measurement techniques. Keele was with Tecron Industrial Products, a division of Crown International and manufacturers of the TEF system analyzer, which made TDS measurements. TEF is now owned by Gold Line, and the current iteration of TEF systems is TEF25.
Bill Allen, who was the OEM sales manager with dbx in 1985, submitted “The VCA, a Definition of the Voltage-control Amplifier.” Allen described the design and application of the Blackmer VCA and provided information on the practical application of VCAs in audio equipment.
Terry Pennington penned “All-pass Delay for Crossover Systems,” explaining the uses of all-pass networks in small-scale applications such as crossovers. Pennington, a frequent contributor to Sound & Video Contractor, was director of technical marketing and development for Rane and is currently the company's MIS manager.
Penny S. Wiegand dealt with the business end of things in “Understanding Invoicing,” which, of course, helped us to understand invoicing.
The results of a survey concerning employee training programs were provided in the September 1985 issue. Of the respondents, 74.2 percent indicated that they had some kind of employee training program. Thirty-seven percent offered technical training, while 29 percent provided access to manufacturers' seminars or schools.
In people news, Howard K. Pelton joined PMI Acoustics in Dallas as principal consultant, and Innovative Electronic Designs announced the appointment of Tom Roseberry as director of marketing and sales.
Advertisers in the September 1985 issue included Shure for its Automatic Microphone System. Rane declared that conventional crossovers have been phased out by its AC 22 and AC 23 state-variable, time-correcting crossovers. Gerald Williams, president of Williams Sound, challenged us to find a better value in a wireless mic. The current Williams product catalog focuses on assistive and large-area listening systems and related accessories. And RTS promoted its RTS System Series 2500 amplifiers. RTS is now part of the Telex group of companies and specializes in intercom systems.
Some of the products featured in What's New included the 544 quad expander/gate from Symetrix and dbx's 163X compressor limiter. Soundcraft introduced the 200B small mixing console, and Audix brought the OM-1 hypercardioid dynamic mic to market. Blonder Tongue announced the CAVM audio-video modulator to produce a single TV channel for an SMATV or MATV network.
Also offered by popular demand was Sound & Video Contractor's computer tools booklet, a 21-page compendium of John Lanphere's computer tools column.
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