Audioaccess AVR21EN, Руководство по установке

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Digital signal with a 3/1/0 or 2/0/0 signal is detected, you may select any of the Dolby surround
modes.
When
DS-OFF appears as a message, it indicates that there is no Dolby Surround data flag in the
audio bitstream. Similarly,
EX-OFF
indicates that there is no Dolby Digital EX data flag. In the
case of a DS-OFF message, you may manually select a Dolby Pro Logic mode to add a
multichannel presentation to the stereo material. In the case of the EX-OFF message, when your
system is configured for surround back speakers you may manually select Dolby Digital EX as
the processing mode to add rear surround speakers to the sound field.
It is always a good idea to check the channel data to make certain that it matches the audio logo
information shown on the back of a DVD package. 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 be sure that the player is sending the correct signal to the AVR.
An
UNLOCK message may appear in the AVR Lower Display Line [square 34]. This is your
indication that the digital audio data stream has been interrupted or is no longer present. When
that occurs, the unit’s digital signal processor has no signal to lock onto, and is thus “unlocked.”
You may see this message when a DVD is first started until the stream is playing and the
processor determines which mode to apply; or any time the data stream is stopped or paused,
such as when the menus of some discs are displayed or when the player is switching between
the different sections of a disc.
You may also see the message when a satellite receiver, cable set-top or HDTV tuner is in use if
the digital audio is temporarily interrupted when channels are changed or when a cable box
switches from a channel with a digital data stream to a channel with analog audio only. The
UNLOCK message is normal, and does not indicate any problem with your receiver. Rather, it tells
you that the incoming data has simply been paused or is not present for a variety of possible
reasons.
PCM Playback
PCM is the abbreviation for Pulse Code Modulation, which is the type of digital signal used for
standard CD playback, and other non-Dolby Digital and non-DTS digital sources such as Mini-
Disc. When a PCM signal is detected, the AVR
Lower Display Line [square 34] 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, Pro Logic II or Pro Logic IIx processing is
applied, as described in
AVR21EN Configuration/Audio Mode .
During PCM playback you may select any surround mode except one of the Dolby Digital or
DTS/DTS-ES modes. However, when a CD with HDCD encoding is being played you must select
the Surround Off (stereo) mode to take advantage of the HDCD process.
HDCD Playback
High Definition Compatible Digital,® or HDCD, discs are recorded using a 20-bit encoding and
other proprietary processing for the ultimate in CD listening. When an HDCD-encoded disc is
playing and the CD player is connected using a digital connection, the AVR21EN will
automatically recognize the HDCD encoding and activate the circuits required for proper playback,
provided that the Surround Off mode is selected. An
HDCD message will appear in the AVR
Lower Display Line [square 34] to confirm the HDCD playback. HDCD playback is limited to
two-channel stereo only.