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Additional features include Dialogue Normalization, which maintains
the same volume level when changing to other Dolby Digital and Dolby
TrueHD programming, and Dynamic Range Control (or 'Night Mode'),
reducing peak volume levels to allow late-night viewing of high-energy
surround sound without disturbing others. Dolby TrueHD is an optional
sound format for Blu-ray Disc, and a mandatory format for HD DVD.
DTS-HD Master Audio and DTS-HD High Resolution Audio
Like Dolby's TrueHD, DTS-HD Master Audio is an advanced lossless
audio codec which is an optional sound format for Blu-ray discs, again
delivering the original recorded sound 'bit-for-bit'. It is also an optional
format for HD-DVD disc recordings. DTS-HD Master Audio is compatible
with the HDMI v1.3 connection standard, and supports a maximum of
192kHz sampling at 24-bit depth in two-channel mode, and 24bit/
96KHz resolution for eight channels in multichannel mode. A DTS-HD
capable processor can also decode discs recorded with DTS-HD High
Resolution Audio. This format is not lossless but delivers virtually all of the
original recording, though not literally identical to the studio master.
DSP Music Modes
Unlike all of the formats mentioned above, the RSP-1570 offers four
surround modes that are not part of a specific recording/playback
system. These modes (DSP 1–4) use digital signal processing that
adds special acoustic effects to any signal. DSP processing can be
used with Dolby Surround recordings, Dolby Digital recordings, CDs,
radio broadcasts, or any other source material; however, typically DSP
settings would be used with source material for which there is no specific
surround decoder.
The four DSP MODES in the processor use digital delay and
reverberation effects to simulate progressively larger acoustic
environments with DSP 1 being the smallest type of venue (such as a jazz
club) and DSP 4 being a large venue (such as a stadium). Typically used
to add ambience and a sense of space when listening to music sources
or other sources that lack surround sound encoding..
2CH/5CH/7CH stereo formats
The RSP-1570 also provides four modes that disable all surround
processing and deliver stereo signals to amplifiers and speakers. The
four options are:
2CH Stereo: Turns off the center channel and all surround channels
in the system and delivers a conventional 2-channel signal to the front
speakers. If the system is configured to route bass signals from the front
speakers to the subwoofer, this capability remains in effect.
Analog Bypass: For 2-channel analog inputs, there is a special stereo
mode that bypasses ALL of the RSP-1570's digital processing. The two
front speakers receive pure analog stereo full-range signals with no
subwoofer crossover, no delay, no level adjustments, and no contour
adjustment.
5CH Stereo: Distributes a stereo signal to 5.1 channel systems. The
left channel signal is sent, unchanged, to the front left and surround left
speakers. The right channel is sent to the front right and surround right
speakers. A mono sum of the two channels is sent to the center channel
speaker.
7CH Stereo: This mode is the same as 5CH Stereo described above
except that it also distributes stereo signals to center back speaker(s)
installed in the system.
Other Digital Formats
Several other digital formats are not surround sound formats at all, but
rather systems for digital 2-channel recordings.
PCM 2-channel: This is an uncompressed 2-channel digital signal such
as that used for standard CD recordings and some DVD recordings,
particularly of older films.
DTS Music 5.1 Discs: These discs are a variation of audio CDs that
include a DTS 5.1 channel recording. The processor decodes these discs
just like a DTS movie soundtrack when played on a CD player or DVD
player with a digital output connection.
DVD-A music discs: Taking advantage of the increased storage
capacity of the DVD disc, new high bit rate multichannel audio
recordings are available on DVD-A discs. DVD-A discs may include
multiple versions of the recording including standard PCM stereo,
Dolby Digital 5.1, DTS 5.1, and 96kHz/24 bit (or higher) multichannel
recordings using MLP compression. Several of these formats (standard
PCM, Dolby Digital, and DTS 5.1) can be decoded by the processor
when the DVD player is connected with a digital cable. However, the
existing optical and coax digital audio connection standard does not
provide sufficient bandwidth for multichannel high sampling rate MLP
recordings. Therefore, you must use the HDMI high-definition digital
connection to replay the high-resolution audio soundtrack of DVD-A
discs. Alternatively, the high-resolution audio can be decoded by the
DVD-A player and the resulting analog signals sent to the processor's
MULTI INPUT.
SACD®: This is a proprietary high-resolution audio standard for use on
SACD compatible disc players. As with DVD-A discs, the bandwidth is
too high for today's digital connection. Thus, these discs must be decoded
by a SACD compatible player, with the output sent to the processor's
MULTI INPUTS.
MP3: MP3 format recordings, often downloaded from the Internet, can
be played on portable MP3 players or some disc players that can read
CD-ROM discs. These players can be connected to the processor's digital
inputs, but must output a digital PCM stream.
Automatic Surround Modes
Decoding of digital sources connected to the digital inputs is generally
automatic, with detection triggered by a "flag" embedded in the digital
recording telling the processor what decoding format is required.
For example, when Dolby Digital 5.1 or DTS 5.1 channel surround is
detected, the processor activates the proper decoding.
The unit will also detect DTS-ES Matrix 6.1 or DTS-ES Discrete 6.1
discs and activate DTS-ES
Extended Surround decoding. Dolby Digital
®
Surround EX recordings also trigger automatic decoding (although
not all Surround EX DVDs have the necessary flag and may require
manually activating Surround EX decoding).
Likewise, a digital input from a standard compact disc, a DTS 96/24
disc, or DTS-ES 96/24 disc, will be auto-detected and properly decoded
to 2CH stereo operation.
Dolby Pro Logic IIx or Rotel XS processing can be configured to be
automatically active in all 6.1 or 7.1 channel systems configured with
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