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The choice of format affects the signal-to-noise ratio. The smaller the track width, the more the signal-to-noise ratio will deteriorate. A stereo machine has two tracks available at a time for recording. A common field practice is to feed the signal from the single microphone to the two tracks thereby doubling the recording area. What is gained is not double the usable playback area but redundancy. It is virtually impossible to sum the two outputs of a stereo recorder without distorting the signal.

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. 1. Output Level and Sensitivity For avian recording, the efficiency of a microphone is of major importance, since the sound level is in many cases extremely low.

It is offered as an accessory item, and is designed to accommodate a wide range of micro­ phones. The parabola was fitted with a Sennheiser MKH-104 omnidirectional condenser microphone. The polar pattern and axial frequency response are shown in Figs. 6 and 7. At the same time, the microphone's axial response was tested without the reflector (Fig. 8). Band-limited pink noise was fed through the source (200-8000 Hz, 18 dB/octave) and the output level of the microphone was noted. The difference between the microphone alone and with the reflector is Fig.

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