. Elements of acoustical engineering. Electro-acoustics; Sound. 202 MICROPHONES shown in Fig. It will be seen that this force leads the particle velocity by 90° for small values of R/\. The phase angle between the voltage out- put of the ribbon and the particle velocity is also shown in Fig. For small values of R/\ the voltage output of a mass controlled dynamic ribbon microphone with a baffle corresponds to the particle velocity in the sound wave. The above analysis has been concerned with a ribbon located in a cir- cular baffle. Irregular baffles instead of circular baffles are u
. Elements of acoustical engineering. Electro-acoustics; Sound. 202 MICROPHONES shown in Fig. It will be seen that this force leads the particle velocity by 90° for small values of R/\. The phase angle between the voltage out- put of the ribbon and the particle velocity is also shown in Fig. For small values of R/\ the voltage output of a mass controlled dynamic ribbon microphone with a baffle corresponds to the particle velocity in the sound wave. The above analysis has been concerned with a ribbon located in a cir- cular baffle. Irregular baffles instead of circular baffles are used in com-. FiG. The phase angle, in degrees, between the actuating force and the particle velocity for a mass controlled ribbon with a circular baffle as a function of R/X. The phase angle between the voltage output of a mass controlled electrodynamic ribbon located in a mag- netic field as a function of R/X. mercial microphones for two reasons: first, a suitable magnetic field results in an irregular baffle and, second, the sound path lengths between the two sides of an irregular baffle differ and, as a consequence, it is possible to obtain uniform directional response characteristics over a wider frequency range. An analytical solution of the irregular plate is difficult. However, the graphical method may be used and is very effective. In well-designed velocity microphones which have been built in the past the effective sound path introduced by the baffle has been made less than one half wavelength for all frequencies within the useful range. There are two reasons for this selection of sound path: first, the response up to this frequency is quite uniform, while above this frequency the response falls off rapidly with increase of the frequency; second, in the case of an irregular baffle the directional characteristics are of the cosine type to within a few per cent of this frequency limit. A commercial microphone. Please note that these images are extracted from scann
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