Filter
Top Products
Latency
• The difference in time between the first input sample entering the DP564
and the output of the first PCM sample representing that input is known
as Latency.
• The latency for inputs flagged as “consumer” is dependent on the
sample and data rates, and conforms to the IEC 61937 specification.
When receiving a consumer stream, the DP564's latency matches that
of a consumer decoder. Generally, the latency of a Dolby Digital data
stream flagged as “consumer” is about 1/3 of that of a stream flagged as
“professional.”
• Decode latency values for inputs flagged as “professional” are:
• The current Decode and additional Processing latency through the
DP564 can be viewed in the System Status menu.
Silent Switch Mode increases PCM latency by one Dolby Digital data
frame period to minimize artifacts when “crash” switching between PCM
and Dolby Digital streams.
Decoding Modes
• Pro Logic II: Pro Logic II (five-channel) matrix decoding of either a 2/0
Dolby Digital bitstream or stereo PCM.
• Pro Logic: Pro Logic (four-channel) matrix decoding of either a 2/0
Dolby Digital bitstream or stereo PCM.
Note: Manual selection of Pro Logic or Pro Logic II decoding on 2/0
Dolby Digital data streams is only possible when the Pro Logic
Monitor Control is set to “Manual.”
Note: Dolby Digital bitstreams containing more than two channels
can be downmixed to Pro Logic or Pro Logic II by first engaging
either the Stereo or Lt/Rt downmix button.
• EX: Surround EX™ decoding of a Dolby Digital bitstream creating a
Center Rear or Back Surround channel. EX decoding is valid only on
Dolby Digital bitstreams with stereo surround channels.
• If all decoding mode buttons are dark, no decoding modes are active,
and the DP564 will pass through a PCM signal or Dolby Digital
bitstream.
Compression Modes
Compression Modes allow the user to select how much
Dynamic Range Control or compression is applied to a
Dolby Digital bitstream during decoding. The DP564
includes four Compression modes selected through a
combination of the three front-panel buttons. These
compression settings emulate all possible compression
choices available on consumer home theater equipment.
The diagram below shows how the Compression mode can
control the dynamic range of an audio signal.
• Custom
A consumer compression mode available on more fully
featured consumer decoders: low- and high-level scaling
of light (Line mode) dynamic range compression
parameters of 0-100% is allowed and dialogue
normalization is applied. To activate the scaling
parameters, hold down the Custom button for three
seconds, until the scaling menu appears. When
downmixing to Lo/Ro or Lt/Rt, high-level cut scaling is
automatically set to 100%.
• Line
A consumer compression mode found on most DVD
players, TV receivers, and as an option (e.g., late-night
mode) within most A/V receivers: light (Line mode)
dynamic range compression is applied at 100%; dialogue
normalization is also applied.
• RF
A consumer emulation mode found on some DVD
players (particularly PC-based) and the RF output of set-
top boxes: moderate to heavy (RF mode) compression is
applied at 100%; dialogue normalization is also applied.
When all three compression mode buttons are dark, the
DP564 is in the Custom mode with 0% scaling. This is
equivalent to the “full range” mode on a consumer decoder:
no compression is applied except during downmixing;
dialogue normalization is applied. During downmixing, high-
level cut compression is applied at 100%, emulating a
consumer product.
Downmix Modes
• Stereo (Lo/Ro): A two-channel downmix designed for stereo listening.
The Left and Right channels are sent to the Left and Right outputs
respectively; the Center channel is added equally to the Left and Right
outputs; the Left Surround is added to the Left output; and the Right
Surround to the Right output*. The level at which these signals are
combined is controlled by downmix level metadata generated in the
Dolby
®
Digital encoder.
• Lt/Rt: A two-channel downmix (Lt, Rt) that is compatible with Pro Logic
®
and Pro Logic II decoding. The Center channel is added equally to the
Lt and Rt outputs* and the Left and Right surround channels are
summed to make a mono surround that is then added, with a phase
difference, to the Lt and Rt outputs. The level at which these signals are
combined is controlled by metadata generated in the Dolby Digital
encoder.
• Mono: All channels' signals are sent to the Center speaker*. On Dolby
Digital bitstreams containing more than two channels, the Mono
downmix is created by combining the outputs from the selected Stereo
downmix mode.
* Note: When decoding 5.1 Dolby Digital bitstreams, the Low-
Frequency Effects (LFE) channel is muted in Stereo, Lt/Rt, or
Mono downmix modes.
Listening Modes
There are three listening modes: Full, 3 Stereo, and Phantom. These
provide a method to preview the consumer's listening experience by
providing a variety of different home theater speaker setups.
• Full: Every channel (depending on the number of input channels and
the decoding mode selected) is reproduced in its appropriate location.
• 3 Stereo: The left and right surround signals are sent to the Left and
Right front speakers, respectively.
• Phantom: The center channel signal is sent equally to the Left and
Right front speakers.
Network Configuration for Remote
Control or Streaming
• Connect the DP564 to your Ethernet switch.
• Configure Network Settings.
If your network has a DHCP server, set the IP Config to Automatic.
Otherwise, set the IP Config to Manual and enter IP and Subnet Mask
addresses. Contact your network administrator for these values and the
Route and DNS settings, if necessary.
• Reboot the DP564.
• The System Status menu should now show valid addresses for IP and
Mask, and will show Route and/or DNS, if the network supports it.
• Install DolbyRemote 564 and the Streaming Server from the CD-ROM
provided.
• Place the DP564 in Remote mode by pressing Shift and then <.
• Launch DolbyRemote 564 and enter the IP address of your DP564 when
prompted.
Clock Reference
The digital audio outputs of the DP564 can be referenced to the input
signal (the default setting) or to an external reference, presented at the
Ref In connector. When externally referenced, an optional sample rate
converter can be enabled to re-sample the output to match the
Reference sample rate.
Room Calibration
• It is essential that the monitoring environment is correctly calibrated
to allow proper evaluation of content quality. The following steps
outline the calibration process. For more information see Section 5
of the User's Manual.
• Use the Speaker Config menu to configure the DP564 to match
your listening system. Set the number of loudspeakers, their sizes,
and the subwoofer crossover frequency. These settings determine
how the DP564 distributes low frequencies to your speakers.
• Set the speaker delays by measuring the distance (in feet) from the
reference listening position to each speaker. The delay is calculated
as follows: C delay = L–C, S delay = C–S, and Bs delay = C–Bs
(where delays are set as 1 foot = 1 ms)
• Set the Digital Reference Level to match your studio digital
reference level.
• Set the master volume to Ref and enable the internal Test Noise.
Adjust the level of each channel using the Master and Channel
Trims so that the measured SPL from each of the main speakers, at
the reference listening position, is identical. This should be done
using an SPL meter set to C weighted, slow.
• The level of the Subwoofer speaker (if present) should be set to
provide +10 dB of gain over the center channel in the frequency
range between 25 Hz and 120 Hz. This measurement should be
made using an RTA.
Bypass Mode
When Bypass Mode is active, the DP564 passes through the input
signal with minimal processing. A PCM input signal passes straight to
the Left and Right outputs. A Dolby Digital bitstream is decoded but no
metadata is applied during the decoding process. Downmixing,
Decoding, and Listening modes are all bypassed. This mode is
intended for testing, station alignment, and troubleshooting. Bypass
mode should not be used during mixing or mastering, as it does not
represent a valid consumer environment. Pressing Shift and then ESC
controls the selection of Bypass mode.
Front-Panel Hardware Reset
Press, hold and release these three buttons simultaneously.
DP564 Reference Decoder Quick Start Guide
www.dolby.com
DP564 Professional Reference Decoder Quick Start Guide Version 1 Dolby, Pro Logic, and the double-D symbol are registered trademarks of Dolby Laboratories. Surround EX is a trademark of Dolby Laboratories. © 2003 Dolby Laboratories, Inc. All rights reserved. S03/14587 Part Number 91834
Bass Management
Bass management allows bass frequencies within a Dolby Digital
signal to be directed to the speakers that are most able to handle
them. Within the DP564, it is controlled by appropriate selection of
speaker sizes in the Speaker Configuration setup menu.
Choosing a small speaker re-directs low frequencies from the smaller
speakers to the subwoofer speaker (if one is present) or to the Left
and Right speakers. A channel set to large does not have any
redirection.
For example, in the case of a 5.1 system consisting of five small
speakers plus a subwoofer, all low frequencies are redirected and low-
pass filtered according to the setting of the Subwoofer Crossover
parameter, summed with the LFE channel and output to the subwoofer
speaker. The current settings can be seen in the Monitor Status menu.
Using the Timecode Output
When playing a Dolby Digital bitstream that contains time stamps
(timecode information), the DP564 generates a Linear Timecode (LTC)
output locked to that bitstream. This output can then be used to lock the
Dolby Digital audio to other sources, for example, a VTR for checking A/V
sync. The DP564 must be the master, so it may be necessary to use a
synchronizer.
Dolby Headphone Processing
Dolby Headphone processing offers listeners the effect of a five-channel
surround sound system over conventional headphones. There are four
modes of processing available: Off (traditional stereo), DH1 (Small
Room), DH2 (Medium Room), and DH3 (Large Room).
Timecode/TS Delay Word Display
Timecode derived from embedded time stamps or the Time Stamp Delay
Word value can be displayed on the main status screen. The Time Stamp
Delay Word is a setting within a Dolby Digital encoder that carries delay
information to downstream devices, such as broadcast transmission
equipment. The delay word is read in milliseconds, where a positive value
indicates an advance and a negative value, a delay.
Shift
Esc
Sample Dolby Digital
Rate Latency Normal Silent Switch
48 kHz 32 ms 2.7 ms 34.7 ms
44.1 kHz 34.8 ms 2.9 ms 37.7 ms
32 kHz 48 ms 4 ms 52 ms
PCM