By O. Kroodsma (Auth.)
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This dissertation proposes and investigates an isochronous instant community for commercial keep an eye on purposes with assured latencies and jitter. in response to a necessities research of actual commercial purposes and the characterisation of the instant channel, the answer strategy is constructed. It contains a TDMA-based medium entry regulate, a dynamic source allocation and the supply of an international time base for the stressed out and the instant community.
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Wickstrom Fig. 2. Three-dimensional microphone polar patterns. (A) Cardioid. (B) Omnidirec tional. (C) Figure eight. (D) Shotgun. (E) Supercardioid (see pp. 9-12). ) Fig. 2 (continued) David C. Wickstrom 10 Fig. 2 (continued) Fig. 2 (continued) David C. Wickstrom Fig. 2 (continued) 13 1. Recording Avian Sounds microphone should be tested. If stability and consistency of the system's perfor mance are important to a recording project, means of calibrating the system in the field must be obtained.
I o n , ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ~ ' ' y ^ - ^ ^ ^ j * , S " " " ~ • ; GPC24 >/. C ~ L - 1 * 7 . „ _ - - A B O . ^ Swi « 0 / * "~^*NX . ' ; ! _ „ ' \ . Z ' o l ^ i . - Q P 0124 P-A • ~,v>P,>" V Multiply Freq. Scale by . 50. r ........ / ^r ; r Zero l e v e l : . 100 - 'V " 11612/21121 , ' 5 A 8 C Lm. Fig. 15. Record-playback response of a Nagra IV-S tape recorder (left channel) at 0, - 1 0 , - 2 0 , and - 3 0 dB (Nagra IV-S meter). (A) 15 ips. 5 ips. 75 ips. 33 n BrUei & KjoBr Potentiometer Range:—50 dB Rectifier: BMS__ Lower Lim.
F. Collecting Specific S o u n d s in the Field 1. The Parabola A parabola focuses onto a single point incoming sound waves that are parallel to its axis. Its effectiveness is determined by the diameter of the reflector in relation to the wavelength of the sound. Its gain and directivity increase propor tionately with decreasing wavelength. For wavelengths larger than the parabola's diameter, the response is predominantly that of the microphone itself. For a parabola to be minimally effective at 100 Hz, the diameter must be a little over 16 David C.