AVI 250 (serv.man9) - Harman Kardon Audio User Guide / Operation Manual. Page 31

Advanced Features

25

Audio/Video Simulcast Recording
It is possible to record the video from one
source along with the audio from a
different input. This is useful in the case
of musical programs where the sound is
being broadcast via FM, or for sports
events where you wish to have the picture
from a TV station, but the play-by-play
from a radio station.

To create a simulcast recording first select
the video source input (

, 

, 

,

) using the input selection buttons

on the remote control or front panel.

78c

Next, select the audio source

(

, 

or 

) 

3456

.

Note that the on screen menu display will
show the split sources (Figure # 7). The
front panel display will show the audio
source in large letters in the main portion
of the Information Display, while the
video source will appear in smaller letters
next to the 

VISUAL

¡

indicator. Once

the split source is configured, select

as the input for VCR1 by

pressing the 

button.

Input sources for 

dubbing

may also be made using the on screen
video menu system.

Delay Time Adjust
One aspect of the surround modes is the
delay of audio signals between the front
speakers and the rear speakers. Each
surround mode is factory preset with a
specific delay time, but it is possible to
individually adjust the delay timing to
custom tailor the sound to your
individual taste and the acoustic
conditions in your listening room or
home theater.

The factory setting is appropriate for most
rooms, but some installations create an
uncommon distance between the front
and surround speakers that may cause
the arrival of front channel sounds to
become disconnected from surround
channel sounds.

To re-synchronize the front and surround
channels, follow these steps:

1. Measure the distance from the
listening/viewing position to the front
speakers. 

2. Measure the distance from the
listening/viewing position to the
surround speakers. 

3. Subtract the distance to the
surround speakers from the distance
to the front speakers and multiply the
figure by three (3). Add fifteen (15) to
the result and round to the nearest
appropriate figure to obtain the delay
time . For example, if the front
speakers are 4 meters from the
listening position and the surround
speakers are 1 meter behind the
listening position, difference between
the fronts and rears is 3. Multiply that
by 3 (which equals 9) and add 15 to
yield a result of 24. Set the delay to
25ms.

NOTE: The delay time may only be
adjusted in certain modes.

If the delay time needs to be changed, 
it may be increased by pressing the

button 

@ p

on the front

panel. The delay time will be briefly 
displayed on the video menus as well as
the front panel.

In addition to the use of the delay time
formula, it is a good idea to understand
the features of each of the AVI250’s
surround modes when entering delay
time. The chart on page 27 provides an
explanation of the suggested for each
mode. The chart also contains the delay
time limits for each of the modes.

Direct Digital Decoding
The AVI250’s digital signal processing
uses sophisticated microprocessors and
advanced digital audio engines that
manipulate sound in the digital domain.
In order to work with sound, these
circuits must first convert the incoming
analog audio input to a digital signal.
After processing, the digital audio signal
must be converted back to analog for
volume control and amplification.

While the digital to analog (D/A) and
analog to digital (A/D) circuits in the AVI
250 are high quality, any time an audio
signal is digitized or reconstructed to
analog there is the possibility of quality
loss. This helps you to avoid un-needed
A/D and D/A conversion from any laser
disc player equipped with a coaxial PCM
digital output.

Engelsk manual AVI250  11/01/98 8:53  Side 25