Sound Quality Part 1
Can we quantify it?

    I do not know how many specifications have crossed my desk that said that the sound system or audio has to be of “high quality.”
Published in December 2009
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Now’s a good time to add to your expertise.

    I have been meaning to raise the topic of audio education for awhile. Having been named NSCA Educator of the Year 2009 for my stint at InfoComm in June [see details in News, October], I guess this is as good a time as any to pile in.
Published in November 2009
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On The Level
The A, B and C of sound level measurement.

    For more than 40 years, the “A” weighted sound level, or dBA, has been the universal measure for assessing sound levels. But why dBA? We’re told it corresponds to the way we hear. This, at best, is only partially true; yet, for some reason, dBA has become the globally accepted measure.
Published in October 2009
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Do Architects Actually Hate Good Sound?
Strategies for dealing with the building design team.

    A young colleague of mine recently asked, “Why do architects hate good sound?” We were returning from a three-hour sparring session with the architects and interior designers for a major project for which we are the acoustics and sound system design consultants.
Published in September 2009
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Hearing Matters
FCC actions leave wireless mics in limbo.

    Traveling over to InfoComm, I enjoyed(?) a nine-hour flight. After awhile, boredom set in and, because it was the middle of the day, I didn’t particularly feel like sleeping
Published in August 2009
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Polar Explorations Conclusion
Polar balloons, Isobal plots and coverage plots

    In Part 1 of this two-part review last month, I showed that there is more to loudspeaker coverage than beamwidth diagrams and directivity plots. I finished up by showing a polar balloon for a poorly designed loudspeaker that had severe lobing problems.
Published in July 2009
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Spotlight Of Sound
Bringing audio in retail environments into focus.
    As retail marketing evolves and becomes increasingly competitive, marketers continue to search for new ways to capture and guide the attention of their customers.

Published in July 2009
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700MHz Allocation Stirs Industry Concerns
FCC actions leave wireless mics in limbo.
    The future use of wireless microphones has again raised its ugly hackles. With the impending transition of television transmission from analog to digital by February 2009, the frequency spectrum previously allocated by the Federal Communications Commission (FCC) to certain analog UHF-TV channels will cease to exist. Most of this spectrum has already been auctioned off for sizable sums to bidders who seek to expand their interests in the 700MHz wireless spectrum.

Published in October 2008
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Return To Cultural Buoyancy
Art and musicality intersect at (Le) Poisson Rouge.
    Paul Klimson of Masque Sound, the East Rutherford NJ-based systems integrator that installed the audiovisual systems in (Le) Poisson Rouge, called the Greenwich Village NY venue “the Lamborghini of clubs.”

Published in September 2008
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Assisting the Hearing Impaired, Part 4
MoPix for you and me?

    “A hearing loss is not visible and often it is overlooked and misunderstood.” This sentence summarizes the challenges associated with assisting the hearing impaired. As systems integrators, we primarily focus on developing and providing technologies that help people who can hear to hear better sound. Few of us focus on helping people with hearing loss to hear better sound.
Published in September 2007
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The Sound of Silence
Exploring advanced functions in sound masking.

    Early sound masking systems consisted of small boxes powered by a low-voltage source. As commercial use expanded, centralized systems evolved, giving rise to more control opportunities. As manufacturers learned more about listener responses to masking, these opportunities developed into expanded functions for the equipment. Some functions improve listener acceptance, while others improve system performance.
Published in August 2007
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Assisting the Hearing Impaired, Part 3
A discussion of audio loop systems.

    More than 28 million people in the United States are hearing impaired. Many of these people attend worship services regularly. I am convinced that, in the near future, even more will attend worship services once they are offered technologies that enable them to have a positive worship experience. I say this based on personal research and from wonderful feedback I have received from readers of Sound & Communications.
Published in August 2007
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Assisting the Hearing Impaired, Part 2
'A little thought, some basic equipment and, voila!, communication happens!'

    Critical Distance (Dc) is a concept used in sound system design as it relates to music clarity, speech intelligibility and even avoidance of feedback. Its applicability or relevance increases with increasingly more reverberant spaces. Let’s start with a definition of Dc and a subjective example of how to experience it.
Published in July 2007
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Assisting the Hearing Impaired, Part 1
Awareness is a key element.

    All people are created equal. This is a core belief of most religions that believe in one God.
    Yet, we all know of individuals who were born with mental or physical handicaps. We also know of people who suffer with degenerative diseases that lead to impairment of some kind. In fact, more than 25 million people have hearing impairments. So, are all people created equal? I have studied this philosophical puzzle in-depth. My understanding contains physical and metaphysical properties. For me, stated in very general terms, this statement means that we all are created equal to experience and worship God.
Published in June 2007
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New Challenges In The Wireless Age
The RFI 'gremlin' has crept into AV's backyard.

     Back in the dim, dark age (about 25 years ago), audio, video, telecommunications, control circuits and computer science were distinct and rigidly segregated subjects, all operating on their distinct copper networks. In those days, radio frequency matters were of scant concern to the majority of practitioners in the AV world. In today’s busy, some would say more complicated, world, these previously unrelated disciplines have, by virtue of rampant convergence, become commonplace concerns for AV system designers and integrators.
Published in November 2006
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Previous Articles:

» Digital Dominance In Consoles (Aug'06)

» Acoustic Compromises (Jun'06)

» Unraveling The Mystery (Jun'06)

» DSP: The Common Denominator (Apr'06)

» Disney's Imagination: A History, Part 2 (Apr'06)

» Disney's Imagination: A History, Part 1 (Mar'06)

» Paging Technology for Hospitals (Dec'05)

» Indoor Stadium Design (Nov'05)

» Loudspeaker Directivity - What it’s good for, how you get it. (Sep'05)

» Acoustic ‘Enhancement’ Systems… -…as electronic architecture? (Jul'05)

» Audio in the Courtroom - With the correct use of technology, everyone involved will be able to hear and participate.. (Mar'05)

» 25 Years of DSP in Sound Reinforcement - Digital signal processing revolutionized the market. (Aug'04)

» Class D Is In Session! - There's now a new choice in amp design. (Feb'04)

» Privacy In The Office Environment - Understanding the sound and the silence: applications of sound masking in open- and closed-plan environments, with possible HIPAA requirements. (Dec'03)

» Secure Wireless Microphone Systems - Basic concepts for preventing eavesdropping. (Apr'03)

» Digital Live Performance Audio - Applications of IT/AV from a live-entertainment and performing-arts perspective. (Sep'03)

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