Technical Data Of The 1/1 Octave Filter; Glossary - sauter KERN SW 1000 Instruction Manual

7.5 Technical data of the 1/1 octave filter

The 1/1 octave filter was developed from a Butterworth filter with base 10. The
technical specifications of each filter are shown in the figure below.
10,0
0,0
-10,0
-20,0
-30,0
-40,0
-50,0
-60,0
-70,0
-80,0
-90,0
-100,0
1 10
31.5Hz
10,0
0,0
-10,0
-20,0
-30,0
-40,0
-50,0
-60,0
-70,0
-80,0
-90,0
-100,0
10 100
1kHz

7.6 Glossary

⚫ Frequency weighting
level of the frequency weighted signal on the display unit and the corresponding
level of a constant sinusoidal input signal. The difference in level is expressed in
decibels (dB). Frequency weighting usually involves A, B, C and D weighting,
which can simulate the frequency response of the human ear. The A and C
weighting are more commonly used and are defined in the IEC standard and GB/T
standard. The B weighting is only defined in the ANSI standard. The D weighting
refers to an international standard that has already been withdrawn. Only some old
devices have the D-weighting. No frequency weighting, i.e. a so-called flat
characteristic curve is always referred to as Z weighting, flat or linear characteristic
curve.
⚫ Time weighting1: Exponential function of time of a certain time constant, which
weights the square of a sound pressure signal. The weighting of the sound
pressure is higher if it corresponds more strongly to the current time and vice
versa. The time weightings "fast" and "slow" are used most often. "Impulse" should
not be used and was only provided for historical reasons.
⚫ SPL: The sound level SPL calculated in the sound level meter is the largest time-
weighted sound level within one second.
SW-BA-e-2020
31.5Hz~500Hz octave filter
100
63Hz 125Hz
1kHz~16kHz Octave Filter
1000
2kHz 4kHz
1
: The difference as a function of frequency between the
1000 10000
250Hz 500Hz
10000 100000
8kHz 16kHz
53