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Articles Tagged Measurement

  • Thursday, June 30, 2016
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    Nigel Redmon 06/30/16 12:45 PM,
    This article is provided by EarLevel Engineering.   Here we lay the foundation. We’ll look at analog to digital conversion, and we’ll look at the spectrum of the resulting digital signal. We’ll use that knowledge to help understand the conversion process back to analog. Though we can build real-world converters that work as described, we’re not building practical converters here; we’re interested in the mathematical concepts involved and their relationships to digital signal processing. Analog To Digital Conversion The sampling… View this story
    Filed in: AVFeatureStudy HallAVDigitalDigital Audio WorkstationsEducationMeasurementSoftware

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    Merlijn van Veen 06/30/16 06:13 AM,
    “It turns out that, within very generous tolerances, humans are insensitive to phase shifts. Under carefully contrived circumstances, special signals auditioned in anechoic conditions, or through headphones, people have heard slight differences. However, even these limited results have failed to provide clear evidence of a “preference” for a lack of phase shift. When auditioned in real rooms, these differences disappear…” – Dr. Floyd Toole As Dr. Toole states, a lot of people, including myself, have a hard time detecting phase… View this story
    Filed in: AVFeatureStudy HallAVEducationLoudspeakerMeasurementSound Reinforcement

  • Wednesday, June 22, 2016
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    PSW Staff 06/22/16 06:18 AM,
    Thousands of fans attending the annual Country Music Association (CMA) Music Festival, held in Nashville June 9-12, enjoyed outdoor entertainment at Ascend Amphitheater featuring a significant change in audio approach and production. Morris utilized its new d&b audiotechnik J-Series system along with the NoizCalc solution to achieve as much noise reduction in the far field as possible while maintaining the concert experience fans are accustomed to when attending a show at an amphitheater. “This was the first year Ascend Amphitheater… View this story
    Filed in: Live SoundNewsAVBusinessConcertLine ArrayLoudspeakerMeasurementSound ReinforcementSubwoofer

  • Tuesday, June 21, 2016
    dennis bohn
    Dennis A. Bohn 06/21/16 11:20 AM,
    This article is provided by Rane Corporation.   This paper discusses the pitfalls (often subtle) of our industry’s failure to define and standardize what “unity gain” means, and the conditions necessary to measure it. It further discusses how people improperly use one piece of misinformation (impedance matching) to correct for this lack of standardization. All done, without knowing discrepancies exist between different pieces of equipment, and without knowing impedance matching is unnecessary, signal degrading, and wasteful. For me, it began… View this story
    Filed in: AVFeatureBlogStudy HallAmplifierAVInterconnectMeasurementPowerSignalSound Reinforcement

  • Friday, June 17, 2016
    amplifiers
    Pat Brown 06/17/16 06:26 AM,
      How much power can an audio amplifier produce? As you might expect, “it depends.” I will approach this from two angles—in theory and in practice. This article will deal with the theory. Part 3 will show how things play out in the real world. Importance Of Efficiency Amplifiers don’t make power. They convert it. Any audio power that comes from your amplifier must in turn come from the utility outlet that it is connected to. This is why the… View this story
    Filed in: AVFeatureBlogStudy HallAmplifierAVMeasurementPowerSound Reinforcement

  • Thursday, June 09, 2016
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    Bruce Main 06/09/16 11:34 AM,
    Trap boxes and line arrays get all the attention. And that’s no surprise – they’re big and loud, and dare I say it, glamorous. But the truck rarely rolls without a complement of two-way loudspeakers sporting a 12-inch or 15-inch woofer and a horn. Whether its monitor wedges, drum fill, front fill or just “speakers on sticks,” small 2-way boxes do many of the everyday jobs that make up a typical sound reinforcement day. We take the performance of these… View this story
    Filed in: AVFeatureStudy HallAVEducationEngineerInstallationLoudspeakerMeasurementSound Reinforcement

  • Thursday, June 02, 2016
    isemic
    Craig Leerman 06/02/16 04:05 AM,
    As an audio technician, my ears have the final say in how a system is tuned, but with the passing of time, they’re not quite as reliable as they used to be. As a result, I’m increasingly relying on measurement systems to help with dialing in the PA. I also utilize SPL apps on my phone and iPad to help monitor volume levels, and that’s worked out well. So when I first saw the iSEMic 725TR measurement microphone from iSEMcon,… View this story
    Filed in: Live SoundFeatureBlogProductAVMeasurementMicrophoneSignalSound Reinforcement

  • Tuesday, May 31, 2016
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    PSW Staff 05/31/16 09:08 AM,
    Audio Precision announces the introduction of the APx1701 Transducer Test Interface. The system integrates instrument-grade amplifiers and microphone power supplies for designers and production test engineers seeking clear insight into the behavior of their electro-acoustic devices. With a signal-to-noise ratio of 134 dB, the APx1701 provides 20 dB of fixed-gain amplification from DC to 100 kHz. In the frequency range of 10 Hz to 20 kHz, the APx1701’s residual THD+N is ≤ -106 dB (80 kHz BW), and frequency response… View this story
    Filed in: AVNewsProductAVMeasurement

  • Thursday, May 26, 2016
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    Curt Taipale 05/26/16 05:58 AM,
    When was the last time that you listened analytically to the loudspeakers in your sanctuary and perhaps other spaces? I mean really, truly listened to them? The reason that I ask is because easily 80 percent of the church loudspeaker systems that I’m invited to evaluate and re-voice (“tune,” “EQ,” “optimize,” etc.) have something seriously wrong with them – something that the church sound techs and pastoral staff are totally unaware of. Sometimes sound techs might be suspicious that things… View this story
    Filed in: Church SoundFeatureBlogStudy HallInstallationLoudspeakerSound ReinforcementTechnician

  • Wednesday, May 18, 2016
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    Dana Troxel 05/18/16 10:48 AM,
    This article is provided by Rane Corporation.   Editor’s Note: This article was originally published through The Rane Library in 2005, yet the information is as relevant now as it was then. Acoustic feedback (also referred to as the Larsen effect) has been roaming around sound reinforcement systems for a very long time, and everyone seems to have their own way to tame the feedback lion. Digital signal processing opened up the microphone to some creative solutions, each with its… View this story
    Filed in: AVFeatureBlogStudy HallAVDigitalInstallationInterconnectMeasurementProcessorSignalSound Reinforcement



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