Impulse response characterization of anechoic and hemi-anechoic chambers.

Traditional engineering design practice seeks to create reliable systems that maintain a desired minimum performance when subjected to a defined set of impulses. To manage impulses, designers implement techniques to specify systems that are resilient or robust to impulses. Resilient systems perform with degraded capacity when subjected to impulses while robust systems remain unaffected by impulses. In this paper we examine antifragility, a complement to resilience and robustness, to manage the impulse response of complex cyber systems. Where fragile systems fracture when subjected to impulses, antifragile systems become stronger. We discuss why this strengthening characteristic makes antifragility attractive for managing impulse response in complex cyber systems and develop a measure for antifragility that differentiates it from fragility, resiliency and robustness. We then discuss an antifragile cyber system to demonstrate the benefits of antifragility in an impulse-rich environment.

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Computing Impulse Response of Room Acoustics Using the Ray-Tracing Method in Time Domain

Archives of Acoustics ◽

10.2478/v10168-010-0039-8 ◽

2010 ◽

Vol 35 (4) ◽

pp. 505-519 ◽

Cited By ~ 4

Author(s):

Adil Alpkocak ◽

Malik Sis

Keyword(s):

Impulse Response ◽

Linear Time ◽

Simulation Software ◽

Room Acoustics ◽

New Approach ◽

Linear Time Invariant ◽

Linear Time Invariant System ◽

Time Invariant ◽

Time Invariant System

AbstractThis paper proposes a new approach for calculating the impulse response of room acoustics. Impulse response provides unique characterization of any discrete lineartime invariant (LTI) systems. We assume that the room is a linear time-invariant system and the impulse response is calculated simply by sending a Dirac Impulse into the system as input and getting the response from the output. Then, the output of the system is represented as a sum of time-shifted weighted impulse responses. Both mathematical justifications for the proposed method and results from simulation software developed to evaluate the proposed approach are presented in detail.

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Calculation and characterization of the impulse response of ultrasonic broad-band transducers

NDT & E International ◽

10.1016/0963-8695(92)90440-r ◽

1992 ◽

Vol 25 (3) ◽

pp. 154

Author(s):

A. Lhemery ◽

D. De Vadder

Keyword(s):

Impulse Response ◽

Broad Band

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A perfusion-based event-related brain activation paradigm: Characterization of CBF impulse-response function and comparison to BOLD

NeuroImage ◽

10.1016/s1053-8119(00)91407-1 ◽

2000 ◽

Vol 11 (5) ◽

pp. S476

Author(s):

Yihong Yang ◽

Wolfgang Engelien ◽

Hong Pan ◽

Su Xu ◽

David Silbersweig ◽

...

Keyword(s):

Impulse Response ◽

Response Function ◽

Impulse Response Function ◽

Brain Activation

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Construction and Characterization of a Portable Sound Booth for Onsite Voice Recording

Medical Problems of Performing Artists ◽

10.21091/mppa.2011.3022 ◽

2011 ◽

Vol 26 (3) ◽

pp. 140-145

Author(s):

Christophe E Jackson ◽

John T Tarvin ◽

Paul A Richardson ◽

Stephen A Watts ◽

Paul F Castellanos

Keyword(s):

Frequency Change ◽

Negative Effects ◽

High Quality ◽

Professional Literature ◽

Modified Method ◽

Acoustic Characterization ◽

Intensity Response ◽

Anechoic Chambers ◽

Voice Recording

The negative effects of environmental noise on sound recordings are recognized in the professional literature. Sound booths and anechoic chambers are examples of controlled acoustical environments widely used in research. However, both enclosures are expensive, require substantial space, and are not portable. Our research has been directed to measuring vocal endurance and voice characteristics of singers before and after sustained voice use. Our desire to acquire high-quality onsite recordings necessitated the development of a portable recording environment. In this article, we report the design, construction, and acoustic characterization of a prototype portable sound box (PSB) to acquire high-quality voice recordings in a controlled, portable acoustical measurement. Simulations were conducted to model the intended use of the PSB by voice users, using two acoustic characterization procedures. The first method showed higher intensity variations by region and depth as frequency changed. For the modified method, intensity response was more uniform and displayed less variation with frequency change. Both methods enabled us to (1) refine the onsite recording procedure, (2) provide insight into potential sources of analysis errors, and (3) develop detailed analysis of frequency intensity response affected by equipment variability. We found that it is possible to construct a PSB for onsite high-quality voice recording.

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