Harman Kardon AVR 745 Service Manual page 24

AVR745
Selecting a Digital Source
To utilize either digital mode, you must have properly
connected a digital source to the AVR 745. Connect
the digital outputs from DVD players, HDTV receivers,
satellite systems or CD players to the Optical or
Coaxial Inputs KM
. In order to provide a
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backup signal and a source for analog stereo recording,
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the analog outputs provided on digital source equipment
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should also be connected to their appropriate inputs on
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the AVR 745 rear panel (e.g., connect the analog stereo
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audio output from a DVD to the DVD Audio Inputs
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on the rear panel when you connect the source's 31
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digital outputs).
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If you have not already configured an input for a
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digital source using the on-screen menus, as shown
on page 22, first select the input using the remote or
front-panel controls, as outlined in this manual. Next,
press the Devices Button 4, followed by the
Screen Button 6 at the top of the row of buttons
on the left side of the TC 30, to the left of the A/V
receiver image on the LCD screen. After the list of
options displayed in the LCD Screen 7 changes,
press the Screen Button 6 to the left of Setup
Menu. After the options change, press the Screen
Button 6 to the right of Digital Input
‹ › Navigation Buttons D on
and then press the /
‹ ›
the TC 30 remote or the / Navigation Button
H on the front panel to choose any of the OPTI-
CAL or COAXIAL inputs, as they appear in the
Upper Display Line # or on-screen display. When
the digital source is playing, the AVR 745 will automat-
ically detect which type of digital data stream is being
decoded and display that information in the Upper
Display Line #.
When both a digital and an analog connection are
made between a source device and the AVR, the digi-
tal input is the default. If the digital stream is not pres-
ent or is interrupted, the unit will automatically switch
over to the analog inputs for the selected source.
If you wish to disable the auto-polling feature, you
may do so by following the instructions shown for the
IN/OUT SETUP menu (Figure 2), as shown
on page 22.
Digital Bitstream and Surround Mode Indications
When a digital source is playing, the AVR 745 senses
the type of bitstream data that is present, and auto-
matically selects the proper surround mode. For exam-
ple, DTS bitstreams will cause the unit to switch to
DTS decoding, and Dolby Digital bitstreams will enable
Dolby Digital decoding. When the unit senses PCM
data from CDs or LDs, you may select any of the stan-
dard Dolby or DTS surround modes or Logic 7. Since
the range of available surround modes is dependent
on the type of digital data that is present, the AVR 745
shows you what type of signal is present to help you
understand the choice of modes.
When a digital source is first detected, the AVR 745
will display a message to indicate the type of bitstream
being received. It will remain in the Lower Display
Line $ for about 5 seconds before that portion of the
display returns to the normal surround mode indication.
For Dolby Digital and DTS sources, a numerical indica-
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tion (such as 3/2/2.1) will appear, showing the
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number of channels present in the data.
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The first number in the display message indicates how
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many discrete front-channel signals are present.
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• A "3" tells you that separate front left, center and
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front right signals are available. This will be displayed
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for Dolby Digital 5.1, Dolby Digital EX and DTS 5.1
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or DTS-EX programs.
• A "2" tells you that separate front left and right sig-
nals are available, but there is no discrete center
channel signal. This will be displayed for Dolby
Digital bitstreams that have stereo program material.
• A "1" tells you that there is only a mono channel
available in the Dolby Digital bitstream.
The middle number in the display message indicates
how many discrete surround channel signals are present.
• A "3" tells you that separate, discrete left surround,
center surround and right surround signals are pres-
ent. This is available only on discs with DTS-ES
digital audio.
• A "2" tells you that separate surround left and right
signals are available. This will be displayed for Dolby
Digital 5.1 and DTS 5.1 programs.
• A "1" tells you that there is only a single, surround-
encoded surround channel. This will appear for
Dolby Digital bitstreams that have matrix encoding.
• A "0" indicates that there is no surround channel
information. This will be displayed for two-channel
stereo programs.
The last number indicates whether there is a discrete
low-frequency effects (LFE) channel. This is the ".1" in
the common abbreviation of "5.1" sound and it is a
special channel that contains only bass frequencies.
• A ".1" tells you that an LFE channel is present. This
will be displayed for Dolby Digital 5.1 and DTS 5.1
programs, as available.
• A "0" indicates that there is no LFE channel infor-
mation available. However, even when there is no
dedicated LFE channel, low-frequency sound will be
present at the subwoofer output when the speaker
configuration is set to show the presence of a
subwoofer.
• The information on the right side of the display will
tell you whether the digital audio data contains a
special flag signal that will automatically activate the
appropriate 6.1 or 7.1 mode. This will be shown as
EX-ON or EX-OFF for Dolby Digital bitstreams and
ES-ON or ES-OFF for DTS bitstreams.
When a 2.0 or 5.1 digital source is playing on a sys-
tem configured for 5.1 operation, you may use Dolby
Digital EX, DTS-ES, Logic 7/7 or Dolby Pro Logic IIx
to add rear channels for full 7.1 sound fields. Note,
however, that the availability of specific modes for
postprocessing is dependent on the format of the
incoming source material. While some combinations
(e.g., a Dolby Digital or DTS 5.1 source with Logic 7/
7 or Dolby Pro Logic IIx postprocessing) are allowable,
others (e.g., a Dolby Digital 5.1 source with DTS
Neo:6) are not. If you wish to add surround back
channels to a 2.0 or 5.1 source, we recommend that
you experiment with the various options to see which
may be available and which are best suited to your
taste and listening environment.
It is always a good idea to check the readout for the
channel data to make certain that it matches the audio
logo information shown on the back of a DVD pack-
age. In some cases, you will see an indication for
"2/0/0" even when the disc contains a full 5.1, or
3/2/.1, signal. When this happens, check the audio
output settings for your DVD player or the audio menu
selections for the specific disc being played to make
certain that the player is sending the correct signal
to the AVR.
PCM Playback
PCM is the abbreviation for Pulse Code Modulation,
the digital signal format used for standard CD play-
back, and other non-Dolby Digital and non-DTS digital
sources such as MiniDisc. When a PCM signal is
detected, the Lower Display Line $ will briefly
show a message with the letters PCM, in addition to a
readout of the sampling frequency of the digital signal.
In most cases, this will be PCM 44 . 1kHz or
PCM 48kHz, though in the case of specially
mastered, high-resolution audio discs, you will see a
PCM 96kHz indication. Note that the sampling
rate displayed is that of the incoming digital signal, and
not the upsampled rate that may be applied to PCM
sources when Dolby Pro Logic or Pro Logic II pro-
cessing is applied, as shown on page 27.
During PCM playback, you may select any surround
mode except Dolby Digital or DTS/DTS-ES mode.
USB Playback
The AVR 745 is among the very few A/V receivers
capable of direct connection to a computer for audio
playback. Once the AVR is connected, audio streams
and playback are possible through your AVR, with all
the power and performance of the high-current amplifi-
er, your own speakers, and the enhanced multichannel
playback made possible through the use of Logic 7,
Dolby Pro Logic II/IIx or DTS Neo:6 processing.
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harman/kardon
OPERATION
OPERATION OPERATION 43 43