VINCENT SV-122 Manuel D'utilisation page 55

3 SETTINGS THE DELAY TIMES OF THE SPEAKER
CHANNELS („DELAY" BUTTON)
In order to achieve a homogeneous sound field at your position in the room, it is necessary to adjust the delay
time values for the rear speaker channels and the Center speaker channel. This is necessary, because in a spea-
ker arrangement typical for a living room the front speaker distance to the listening position is usually larger
than the rear speaker distance to the listeners. Irritations of the perception of direction by early surround signals
are avoided by delaying the signal for the rear speakers. In some speaker arrangements a delay time must also
be adjusted for the center speaker. As the result the sound signals of all speakers arrive at the listener at the
same time. In the mode „PROLOGIC", additional 15ms (milliseconds) of delay cause the back channel sound
to arrive later than the front channel sound. This is part of the "Dolby Surround Prologic" specification and redu-
ces audibility of sound fractions crosstalked from the front channel signals and makes sure that the audio infor-
mation, that is important for sensual location of acoustic sources, is first obtained from the front channels. This
receiver allows Surround delay times from 0ms to 15ms (milliseconds) in the „Dolby Digital" mode and from
15ms to 30ms in the „Prologic" mode. Additionally, in the „Dolby Digital" mode, a Center delay time in the
range 0ms...5ms must be set. All this has to be done after first installation of the system and to be repeated
everytime the speaker distances are changed.
Calculating the delay time values
Surround delay for Dolby Digital mode:
right speaker. Substract from this value the distance from the listener's position to the rear speakers. Each
30cm of this difference should be related with a delay time of 1ms. Round to the closest multiple of 30cm.
For example, a length difference of 120cm results in a required delay time of 4ms. The maximum value is
15ms.
Center delay for Dolby Digital mode:
ker and to one of the front speakers. Substract the Center distance from the Front speaker distance. Again,
30cm of this difference should be related with a delay time of 1ms. Round to the closest multiple of 30cm.
If the Center speaker is about 50cm closer to the listener, 2ms of delay time should be applied. The maxi-
mum value is 5ms.
Surround delay for Dolby Prologic II mode:
Setting the Dolby Digital delay times
Choose one of the receiver inputs with digital sound (OPTICAL, COAXIAL (14)). Use the button "LISTEN"
(3)(37) to enter playback mode "Dolby Digital". Press the „DELAY" (42) button.
SDLY - -ms Use the „SET" buttons (38) to change the parameter for the rear (surround) speaker channels
to the calculated value for Dolby Digital. Press the „DELAY" (42) button again and enter the
calculated value for the center channel delay using "SET" (38).
CDLY - -ms If no input is given for a couple of seconds, the settings mode is quit into normal operation.
Measure the distance from your listening position to the front left or
Measure the distance from your listening position to the Center spea-
Add 15ms to the Surround delay time in Dolby Digital mode.
Vincent
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