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Friday, April 05, 2013
Pat Brown 04/05/13 08:04 AM,For most humans, there is nothing easier than breathing, seeing, smelling and hearing. We do these things without thought, and even take them for granted. Our senses were given to us to help us exist in a physical universe. They are transducers that allow physical stimuli to be converted into a form recognized by the brain. We are bombarded with stimuli every waking moment, and our brains are continuously processing the information to help us function in our environment. Of… View this story
Filed in: Church Sound • Feature • Blog • Study Hall • Education • Installation • Measurement • Signal • Sound Reinforcement • System -
Friday, March 15, 2013
Charlie Hughes 03/15/13 04:29 PM,We are all familiar (or at least should be) with a low-pass and high-pass filter. As the name implies, they pass one part of the audio spectrum while attenuating the others. They are the basis for loudspeaker crossovers. As with any analog filter there is phase shift associated with the change in output magnitude of these filters. Examples of these are shown in Figure 1 (below) as fourth-order Linkwitz-Riley filters. If we were to add the output of these filters… View this story
Filed in: AV • Feature • Blog • Study Hall • AV • Line Array • Loudspeaker • Measurement • Processor • Sound Reinforcement • System -
Tuesday, February 26, 2013
John Eargle & Chris Foreman 02/26/13 05:12 PM,Audio signals are, of course, speech and music, and in this article we will examine the nature of those signals in terms of their requirements in bandwidth, dynamic range and normal operating levels. The nature of peak and average levels of music and speech will be discussed. In addition, we’ll look at the standard methods of dealing with signal peaks and required shifts in signal operating levels. AUDIO SPECTRA The data of Figure 1 shows the approximate limits of bandwidth… View this story
Filed in: AV • Feature • Blog • Study Hall • AV • Loudspeaker • Measurement • Processor • Sound Reinforcement -
Thursday, January 31, 2013
Ken DeLoria 01/31/13 01:30 PM,This is the first installment in a series that will explain how various types of audio analyzers function, how they differ in capability and usage, and the way that the test and measurement industry has evolved over the past five decades. Way, way back in time, graphical acoustic measurements were acquired by means of chart recorders. A chart recorder looks a lot like the lie detector seen in old-time movies and is analogous to a mechanical version of a CRT… View this story
Filed in: AV • Feature • Blog • Study Hall • Production • Audio • AV • Engineer • Loudspeaker • Measurement • Processor • Signal • Sound Reinforcement -
Friday, January 18, 2013
Vance Breshears 01/18/13 06:37 PM,“Hi, my name is Bob. I’m with “xyz” church and we’re designing a new worship center,” says a voice on the other end of the phone. “The architect told us it’s time to get a sound guy involved, so I’m calling you.” “Oh no,” I think, “this is the first sign of trouble.” After talking with him to get initial information about the scope of the project, we get to the heart of the problem: “Most of the building design… View this story
Filed in: Church Sound • Feature • Blog • Study Hall • Business • Installation • Measurement • Processor • Software • Sound Reinforcement -
Thursday, January 17, 2013
Pat Brown 01/17/13 10:27 AM,The human auditory system is equipped with two inputs - left and right ears. This “binaural” processing system provides us with the ability to localize where sound is coming from, something that a one-eared listener would have difficulty in doing. Playback systems may utilize any number of channels to surround the listener with sound, but two channels is always enough to simulate the human listener. Recording enthusiasts have long discovered the benefits of stereo microphones. While not necessarily “human-like,” they… View this story
Filed in: AV • Feature • Poll • Study Hall • Production • Audio • AV • Installation • Measurement • Signal • Sound Reinforcement • System • Technician -
Wednesday, January 16, 2013
Charlie Hughes 01/16/13 09:39 AM,While it’s nothing new to place a limiter immediately in front of a power amplifier to keep it from clipping, there is more that can be accomplished with a limiter to squeeze a bit more low-frequency performance out of a loudspeaker while keeping it within its safe operating area. Most loudspeaker systems have a limited excursion capability. The voice coil and cone assembly can travel only so far before the motor strength significantly decreases, the suspension (surround and/or spider) reaches… View this story
Filed in: AV • Feature • Study Hall • Amplifier • AV • Education • Loudspeaker • Processor • Sound Reinforcement -
Thursday, December 13, 2012
Pat Brown 12/13/12 07:35 PM,When most people think of sound reinforcement systems, or audio systems in general, they rarely do so with regard to speech intelligibility (SI). It’s usually about the music, with the assumption that if a system sounds good for music, it should work for speech. While this can be true in small, well-behaved rooms, it is seldom true in large spaces. My first sound system disaster was the design and installation of a large, expensive sound system that failed to produce… View this story
Filed in: AV • Feature • Blog • Study Hall • AV • Education • Measurement • Signal • Sound Reinforcement -
Wednesday, December 05, 2012
Charlie Hughes 12/05/12 10:26 AM,The specification of a loudspeaker’s sensitivity is probably one of the most common, yet perhaps one of the most misunderstood. It’s common to see the magnitude response of a loudspeaker system reduced to a single number as a sensitivity rating. This is perhaps at the heart of the confusion. One would think that this metric should give some indication as to how loud a particular loudspeaker will be when reproducing a signal. One may also think that two loudspeakers with… View this story
Filed in: AV • Feature • Study Hall • AV • Loudspeaker • Measurement • Sound Reinforcement -
Wednesday, October 10, 2012
Jamie Anderson 10/10/12 04:03 PM,Feed The Brain. The primary job of a measurement rig is to acquire electrical and acoustical signals and feed them to the processor so that it can analyze, compare, slice, dice, fold, spindle and mutilate those signals and produce multi-colored charts, graphs and the all-important squiggly lines. “But my software can produce squiggly lines all by itself without all those bothersome wires, preamps and microphones. Isn’t that enough?” Maybe. It depends on whether you are getting paid to pose or… View this story
Filed in: AV • Feature • Study Hall • AV • Digital • Measurement • Microphone • Signal • Software • Sound Reinforcement • System
Articles Tagged Acoustic Measurement
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