Primer
Crestron
Surround Sound
Peaking EQ
Peaking equalization (EQ) filters permit a precise amplitude adjustment
of a selectable range of frequencies. The range can vary from a small
slice of the frequency spectrum to a two-octave area. EQ filters allow a
fine adjustment to compensate for room acoustics, noise, and speaker
limitations. If, for example, the furniture or floor coverings absorb
sound in the 4 kHz range. The frequency response of the system can be
equalized by increasing the amplitude of the 4 kHz signals. If this
increase in amplitude closely matches the loss of the room, then the
frequency response is flattened, creating a more realistic sound.
In the following example, a parametric filter is used to adjust the
response by boosting the signal by +6 dB at 4 kHz.
The bandwidth (octave) range is also adjustable, which determines the
slope of the affected adjacent frequencies. In this case, the octave range
has been set to 0.6. This affects adjacent frequencies from about 2 kHz
to 8 kHz by gradually increasing the amplitude from 2 to 4 kHz and
gradually decreasing the amplitude from 4 kHz to 8 kHz.
32
•
Surround Sound
Primer – DOC. 6122
