Effect Of Delay - Sony SRP-X500P System Integration Manual

SRP-X500P System Integration Guide
Response time
As mentioned on the previous page, the AGC changes the
gain in response to the input level. However, sound from a
loudspeaker may be unnatural when the volume is rapidly
changed by the AGC. ATTACK, HOLD TIME, and RELEASE
adjustments reduce unnatural sounding level changes.

Effect of Delay

When configuring a multiple speaker system, you should
take the "hass effect" (see below) into consideration.
Using the hass effect, the delay processor makes
adjustments to locate signal sources in the desired
locations.
Speed of sound
Sound speed is calculated as: sound speed · = · 331.5 + 0.6t
(m/s). When the temperature is 14 °C, the speed of sound
is usually described as 340 m/s.
Hass effect
When the sound is amplified from multiple speakers, we
feel as if the sound comes from the direction where the
signal first arrives at our ears. This phenomenon is called
the "hass effect." Using this effect, we can control the
source of sound by adding delay on any speakers.
Sound localization
In a stereo speaker system, a listener identifies that the
source of sound is located in the middle of the L and R
speakers. This effect is called "the origin of sound located
at the mid-point between two speakers."
Sound image of satellite speakers
In a sound system incorporating satellite speakers, sound
from a satellite speaker can reach the listeners in the back
of the room faster than sound coming from the front
speakers. So human ears misinterpret the sound source,
thinking it is the mid-point between satellite speakers not
the front screen. This makes our ears feel uncomfortable.
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Response time of the attack
Time to maintaining the gain
Response time of the attenuation
Compensation with delay
The delay function controls the timing of the sound
reaching the listener. By delivering the sound from main
speakers 10 to 20 ms faster than satellite speakers, the
source of the sound can be appropriately located on the
screen. As a result, listeners will hear a more natural
sound.
R ch
Sound source
L ch
R ch
Sound source
L ch
DELAY
R ch
Sound source
L ch
DELAY
Delay Compensation
: Sound image localization