The sonic boom flight test program conducted at Jackass Flats, Nevada, during the summer and fall of 1970 consisted of 121 sonic-boom-generating flights over the 1500 ft instrumented BREN tower. This result implies that a supersonic transport designed to yield minimized sonic booms may be substantially more acceptable than an unconstrained design.įlight test measurements and analysis of sonic boom phenomena near the shock wave extremity A comparison of the calculated loudness values indicates that shaped booms may have significantly reduced loudness relative to N-waves having the same peak overpressure. The loudness of shaped booms is highly dependent on the characteristics of the initial shock. The loudness of N-waves is controlled by overpressure and the associated rise time. The procedure is applied to a wide range of sonic booms, both classical N-waves and a variety of other shapes of booms. Plotkin, Kenneth J.Ī loudness calculation procedure applied to shaped sonic boomsĭescribed here is a procedure that can be used to calculate the loudness of sonic booms. As part of this demonstration, evanescent waves also will be recorded. A novel flight demonstration technique that generates low overpressure N-waves using conventional military aircraft is outlined, in addition to initial quantitative flight data. The loudness of these evanescent waves can be computed, but flight measurement validation is needed. Supersonic flight slower than the cutoff Mach number, which generates evanescent waves, also prevents loud sonic booms from impacting the ground. Until now, molecular relaxation effects on low overpressure rise time had never been compared with flight data. Past efforts have concentrated on the use of sonic boom simulators to assess human response, but simulators often cannot reproduce a realistic sonic boom sound. To successfully design quiet supersonic aircraft, the upper limit of an acceptable noise level must be determined through quantitative recording and subjective human response measurements. The recent flight demonstration of shaped sonic booms shows the potential for quiet overland supersonic flight, which could revolutionize air transport. The Operators will potentially confuse some users, but flicking random switches creates good results and is great fun.Flight Demonstration Of Low Overpressure N-Wave Sonic Booms And Evanescent Waves MTM MTM VerdictĪ truly original plug-in that excels at glitch edits and dirty, la-fl sounds. Just don't expect it to make sense immediately, and be prepared to spend some time finding your way around. However, what sets this plug-iri apart are the sounds that it can generate - it's quite unlike anything else we've heard, and if you like circuit-bent glitch sounds it's an absolute no-brainer. Another superb feature is the ability to control the switches, frequency or program changes via a MIDI keyboard. This is a unique approach that may be baffling to some, but flicking random switches can lead to happy accidents. Things get more confusing when you come to the two Operators, which have 16 switches each for changing and modulating the read position. A Clock Frequency knob controls both the speed of the playback and the audio quality, making it possible to do some brain-melting pitch-dives or build-ups by sweeping with the sync switched off. The main part of the plug-in, however, is the 12-bit memory, displayed as an LED array at the bottom, with red dots showing incoming audio written to memory and green dots representing the playback position. These controls alone are enough to give any sound that you pass through the plug-in a gritty, distorted vibe. On the left you have the Analog section, which has controls for input level, a soft clipper and brickwall limiter, a high-/low-pass filter that can be placed at several points in the chain, a feedback control with Flip L/R and Invert switches, an output control with another soft clipper and, finally, a dry/wet control. The first thing you notice about Permut8 is the striking GUI, which has been designed to give the plug-in the feel of a piece of hardware. The latest is Sonic Charge's Permut8 - a digital delay plug-in that can be programmed to produce a wide range of effects, from standard delay lines and flangers to beat-repeats and bit-crushers. Each has a different sounds, layout and techniques for creating controlled chaos. We've seen a number of fun glitch-based effects plug-ins released over the last couple of years, from BT and iZotope's Stutter Edit to Sugar Bytes' Turnado. Ĝreate unigue, complex glitch effects and lo-fi, bit crushed sounds.Ěnalogue sounding input and output with soft clipper.Operator switches for adjusting the read position.đ2-bit digital delay with variable clock speed.
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