Sony SRP-X700P - Manual (Page 42)

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Delay
The difference in time between one arrival signal and another arrival signal, causes delay.
In sound system for conference and lecture hall, for example, a delay function is used to
adjust audio signal reproduced from satellite speaker being ahead of one from main
speaker.
The delay time is related to velocity of sound and distance between speakers.
The speed of sound wave in air at 21 degrees C (70 degrees F) is given by the formula as
follows.
C=344 m/second C=1130 ft/second
Feedback Reduction
In sound system incorporating microphones and speakers to reproduce microphone’s
source, feedback (the returning of a loudspeaker signal back into a microphone which
routes the signal to the loudspeaker) of some frequencies occurs when microphone ’s gain
level becomes higher. (The feedback can occur too, when recorder’s IO are plugged to a
mixer, in between the recorder and mixer.)
A feedback reduction function in SRP-X700P is to reduce the feedback by applying notch
filters (up to 5) to the frequencies of each microphone signal independently, in order for
the system to take higher voice sound level in listening area. It automatically generates
and detects the frequencies and applies the filters with operation on Manager GUI.
Advantage of independent applying to the each microphone input, is not to change sound
of the other channel’s sources such as line inputs. Feedback reducer connected to before
power amplifier, changes sound of line sources in particular.
Frequency Response
It is the ratio of the input signal to output signal for devices, component or system with
regard to signal frequency. It is a fundamental specification fo r those.
(It is commonly considered that the frequency range of human hearing is 20-20,000Hz.)
Gate
It fully attenuates a signal that falls to below a per-set up threshold level.
It is, for example, used to reduce noise.
In SRP-X700P, the gate is applied to automatic mixing function to switch an input
channel on or off.
Equalizer
It is to control the relative amplitude of various frequencies in audio signal.
It is, for example, used to correct frequency response of picked up sound, to adjust
reproduced frequency response of sound system, to control tone timbre as effect, etc.
Graphic Equalizer
It enables to boost or attenuate (cut) the level of certain frequencies with vertical
slide volumes. Its advantage is to be able to see the controlled curve of frequency
response by connecting positions of the volumes.
Parametric Equalizer
It enables to control the bandwidth and frequency of certain frequencies as well as
boosting or cutting the level of the frequencies. Its advantage is to enable flexible
equalization with less number of bands.