It is also one of the few companies with its own musuem, featuring some of the first commercial oscilliscopes, sound level meters, precision microphones and strobe lights.
32.
As Francisco Rodriguez warmed up for the bottom of the eighth inning at Pacific Bell Park on Wednesday night, the scoreboard showed something called a Sound Level Meter.
33.
The A-weighting curve has been widely adopted for environmental noise measurement, and is standard in many sound level meters ( see ITU-R 468 weighting for a further explanation ).
34.
A-weighting is also used, especially in the USA, though this is only really valid for the measurement of tones, not noise, and is widely incorporated into sound level meters.
35.
The standard sound level meter can be called an " exponentially averaging sound level meter " as the ms ) originally called Fast and'I'( 35 ms ) originally called Impulse.
36.
Sound level readings were taken with an Extech 407735 sound level meter reading on the A scale, with the sensor located behind the helmsman to reduce with and hull noise.
37.
The standard sound level meter can be called an " exponentially averaging sound level meter " as the ms ) originally called Fast and'I'( 35 ms ) originally called Impulse.
38.
The sound level meter is useless for properly assessing noise levels, since the commonly used A-weighting is based on equal-loudness contours for pure tones, and is not valid for the random noise.
39.
An exponentially averaging sound level meter, which gives a snapshot of the current noise level, is of limited use for hearing damage risk measurements; an integrating or integrating-averaging meter is usually mandated.
40.
Pitch generators are typically used in conjunction with sound level meters, when measuring the acoustics of a room or a sound reproduction system, and / or with oscilloscopes or specialized audio analyzers.
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