Design of a Studio-Quality Condenser Microphone Using Electret Technology
The performance requirements of a studio-quality condenser microphone are reviewed in light of present recording, broadcast, and sound reinforcement practice. Consideration is given to both electroacoustical performance and environmental stability. A condenser transducer is described which makes use of refined electret technology and demonstrates performance advantages over similar conventional, externally biased configurations. The details of a new RLC -lossy ladder- acoustical phase shift network are presented in basic terms as applied to the design of a cardioid unidirectional microphone. Finally a unique impedance conversion electronics section is described in terms of noise level, load driving capability, distortion, and environmental stability.
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