the digital source by pressing the Digital Select Button q# and then using the ⁄/¤ Buttons n on the remote or the ‹/› Selector Buttons ) on the front panel to choose any of the OPTICAL or COAXIAL inputs, as they appear in the Upper Display Line ˜ or
AVR 135 will automatically detect which type of digital data stream is being decoded and display that infor- mation in the Upper Display Line ˜.
Digital Bitstream Indications
When a digital source is playing, the AVR 135 senses the type of bitstream data that is present. Using this information, the correct surround mode will automati- cally be selected. For example, 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 standard surround modes, such as Dolby Pro Logic II or Logic 7. Since the range of available surround modes is dependent on the type of digital data that is present, the AVR 135 uses a variety of indicators and messages to let you know what type of signal is present. These messages will appear shortly after an input or surround mode is changed, and they will remain in the Lower Display Line ¯ for about five seconds before that portion of the display returns to the normal surround mode indication.
Surround Mode Types
For Dolby Digital and DTS sources, a three digit indi- cation will appear, showing the number of channels present in the data. An example of this type of display is 3/2/.1.
The first number indicates how many discrete front channel signals are present.
•A “3” tells you that separate front left, center and front right signals are available. This will be displayed for Dolby Digital 5.1 and DTS 5.1 programs.
•A “2” tells you that separate front left and right signals 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 indicates how many discrete sur- round channel signals are present.
•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
The last number indicates whether there is a discrete
•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,
•The information in the right side of the display will tell you if the digital audio data contains a special flag signal that will automatically activate the appro- priate 6.1 or 7.1 mode. This will be shown as
When Dolby Digital 3/2/.1 or DTS 3/2/.1 signals are being played, the AVR will automatically switch the proper surround mode, and no other processing may be selected. When a Dolby Digital signal with a 3/1/0 or 2/0/0 signal is detected you may select any of the Dolby surround modes.
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 indication for “2/0/0” even when the disc contains a full 5.1, or 3/2/.1 sig- nal. When this happens, check the audio output set- tings 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.
An UNLOCK message may appear in the Lower Display Line ¯. 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 proces- sor 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
OPERATION
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 nor- mal, 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 Indications
PCM is the abbreviation for Pulse Code Modulation, which is the type of digital signal used for standard CD playback and other
In most cases this will be 48kHz, though in the case of specially mastered,
Some DVD discs are recorded with both “5.1” and “2.0” versions of the same
Speaker/Channel Indicators
In addition to the bitstream indicators, the AVR 135 features a set of unique
Figure 9
These indicators are the L/C/R/LFE/SL/SR/SBL/SBR letters that are inside the center boxes of the Speaker/ Channel Input Indicators ˆ on the front panel. Remember that the AVR 135 is capable of processing a
