Harman Kardon AVI 250 - Advanced Features; Simulcast Recording Procedure; Delay Time Adjustment; Direct Digital Decoding

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 (TV, LD,
VCR2, AUX) using the input selection
buttons on the remote control or front
panel. FAEI@> Next, select the audio
source (Tuner, CD or TAPE)
EILIEG. 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 SOURCE as
the input for VCR1 by pressing the
VCR1 COPY button.
Input sources for VCR1 COPY 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 sur-
round mode is factory preset with a spe-
cific delay time, but it is possible to
individually adjust the delay timing to
custom tailor the sound to your individ-
ual taste and the acoustic conditions in
your listening room or home theater.
The factory setting is appropriate for
most rooms, but some installations cre-
ate 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.
Advanced Features
25
To re-synchronize the front and surround
channels, follow these steps:
1. Measure the distance from the lis-
tening/viewing position to the front
speakers.
2. Measure the distance from the lis-
tening/viewing position to the sur-
round speakers.
3. Subtract the distance to the sur-
round 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 listen-
ing position and the surround speak-
ers 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
DELAY button {4 @ 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 sur-
round modes when entering delay time.
The chart on page 27 provides an expla-
nation 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 cir-
cuits 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 vol-
ume 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.
If your player has this type of output,
connect the LD player to the AVJ250 with
a high quality digital interconnect (110
HSINONA