Audio and Hi-fi Engineer's Pocket Book by Vivian Capel

By Vivian Capel

Now in its third variation, a concise number of functional info for these engaged on, or drawn to, sound structures. up-to-date all through to hide the most recent know-how and security rules

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An integral detector converts these to audio which is fed out via the cable. Apart from a lower supply voltage, the advantage is avoidance of electrostatic tension of the diaphragm and the risk of flashover. c. supply restricts their use mainly to recording and broadcast studios where the highest quality is required at any cost. Electret This is an inexpensive capacitor unit in which a permanent charge equivalent to about 100 V is implanted in the diaphragm during manufacture by heating the plastic between the plates of a charged air-spaced capacitor.

Phasing/flanging Originally achieved by running the same signal on two recorders, one of which was intermittently slowed by an obstruction held against the tape spool. When combined there were alternate cancellations and reinforcements of the two signals. This was termed phasing; an electronic version which did not have quite the same effect was called flanging. ) Pitch changing Pitch can be increased or decreased without altering the timing. One stereo channel can be gradually flattened while the other is made sharp; and the effect can then be changed over.

Another method of specifying noise is as a signal/noise ratio. Unlike an amplifier there is no maximum signal to use as a reference, so it is fixed at 1 Pascal which is a SPL of 94 dB. Conversion of unweighted equivalent noise to signal/noise ratio or vice-versa can thus be simply performed by subtracting from 94. Typical weighted noise values: capacitor, 3-6 μ\ί; moving coil, 0-26 μΥ. 48 100 Hz 200 400 800 1 kHz 2 kHz 4 kHz 8 10 Fig. 45. DIN 45-405 Noise-weighting curve. Hum Dynamic microphones are prone to pick up hum from the magnetic fields of electrical equipment.

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