| Glossary |
 |
Pick-up pattern |
| |
Also
known as polar pattern, directivity. According to their acoustic
design, microphones differ in their sensitivity towards sound from
different directions. Pressure microphones have a sensitivity that is
largely independent of direction (omni-directional pick-up pattern).
Pressure gradient microphones have the pick-up patterns wide cardioid,
cardioid, super-cardioid or figure-of-eight. Interference microphones
can be used to achieve a further concentration of the pick-up pattern
(lobar pick-up pattern). As a special case, dummy head microphones
achieve the pick-up pattern of the human ear/head (dummy head stereo). |
 |
|
Sensitivity in free field, no load (1kHz) |
| |
Voltage
measured at the unloaded output of a microphone which is exposed to a
sound pressure of 1 Pa and a frequency of 1 kHz in an anechoic chamber. |
|
|
Nominal impedance |
| |
See impedance. |
|
|
Min. terminating impedance |
| |
Impedance
at which the connected unit meets the specified technical data. If the
unit is connected to a lower impedance, it will usually have a lower
output voltage or a greater distortion. |
|
|
Equivalent noise level |
| |
The
output signal of every microphone always includes a low noise signal in
addition to the useful signal. In order to illustrate the extent of the
noise voltage, it is given as a fictitious sound pressure level. In an
ideally noise-free microphone, a sound pressure level of this magnitude
would result in an output voltage of the magnitude of the noise.
Self-noise is measured and weighted either in accordance with CCIR
468-3 or – in order to assimilate the measured result with the
listening impression of the human ear – in accordance with DIN/IEC 651
(so-called A-weighted). Studio condenser microphones generally have an
equivalent noise level of between 20 and 30 dB (CCIR) or between 10 and
20 dB(A). |
|
|
Equivalent noise level weighted as per CCIR 468-3 |
| |
The
output signal of every microphone always includes a low noise signal in
addition to the useful signal. In order to illustrate the extent of the
noise voltage, it is given as a fictitious sound pressure level. In an
ideally noise-free microphone, a sound pressure level of this magnitude
would result in an output voltage of the magnitude of the noise.
Self-noise is measured and weighted either in accordance with CCIR
468-3 or – in order to assimilate the measured result with the
listening impression of the human ear – in accordance with DIN/IEC 651
(so-called A-weighted). Studio condenser microphones generally have an
equivalent noise level of between 20 and 30 dB (CCIR) or between 10 and
20 dB(A). |
|
|
Dimensions |
| |
|
|
|
Weight |
| |
|
|
