Operation
To take advantage of the AVR 5550’s MP3 capa- bilities, simply connect the digital (SPDIF) output of a computer sound card able to feed the MP3 format to its digital output, or the digital (SPDIF) output of MP3 compatible CD or DVD players or of a portable MP3 player with a digital output to
either the rear panel Digital Inputs or the front panel Digital Inputs *Ó.
NOTES:
•The AVR 5550 is only capable of playing signals in the MP3 (MPEG 1/Layer 3) format. It is not compatible with other computer audio codecs.
•The MP 3 DSP mode found in the new
AVR 5550 requires an MP3 SPDIF stream. Presently, only a few units provide this but in the coming generations of motherboards and operating system updates this will follow, since SPDIF is the standard for audio & video hardware.
•The digital audio input signal may be either optical or coaxial, but the signal must be in the MP3 SPDIF format. Direct connection of USB or serial data outputs is not possible, even though the signals are in the MP3 format. If you have any questions about the data output format from your computer or a sound card, check with the device’s Owner’s Manual or contact the manufacturer’s technical support area.
•If your computer or sound card’s digital output is not capable of direct connection to the AVR or if the output is not capable of delivering MP3 data stream, you may use an optional, external transcoder, such as those available from Harman Kardon to convert the USB output of a computer to a format compatible with the AVR. Contact your Harman Kardon dealer for additional details.
Selecting a Digital Source
To utilize either digital mode you must have properly connected a digital source to the
AVR 5550. Connect the digital outputs from DVD players, HDTV receivers, satellite systems or CD players to the Optical or Coaxial inputs on the rear or front panel *Ó. In order to provide a backup signal and a source for analog stereo recording, the analog outputs provided on digital source equipment should also be connected to their appropriate inputs on the AVR 5550 rear panel (e.g., connect the analog stereo audio output from a DVD to the DVD Audio inputs on the rear panel when you connect the source’s digital outputs).
To select a digital source such as DVD, first select its input using the remote or front panel Input Selector 4% as outlined in this manual in order to feed its video signal (if any) to the TV monitor and to provide its analog audio signal for recording. When the digital input associated with the input selected (e.g. “DVD”) is not selected automatically (due to the input settings made
earlier during the system configuration, see page 21), select the digital source by pressing the Digital Input Selector button GÛ and then using the ⁄/¤ buttons Don the remote or the Selector buttons 7$ on the front panel to choose any of the OPTICAL or COAXIAL inputs, as they appear in the Upper Display Line A or on-screen display.
When the digital source is playing, the AVR 5550 will automatically detect whether it is a multi- channel Dolby Digital or DTS source or a HDCD, MP3 or conventional PCM signal, which is the standard output from CD players.
Note that a digital input (e.g. coaxial) remains associated with any analog input (e.g. DVD) as soon as it is selected, thus the digital input need not be re-selected each time the appropriate input choice (e.g. DVD) is made.
Digital Bitstream Indicators
When a digital source is playing, the AVR 5550 senses the type of bitstream data that is present. Using this information, the correct surround mode will automatically 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 and LDs and some music DVDs or certain tracks on normal DVDs, it will allow the appropriate surround mode to be select- ed manually. Since the range of available surround modes depends on the type of digital data that is present, the AVR 5550 uses a variety of indicators to let you know what type of signal is present. This will help you to understand the choice of modes and the input channels recorded on the disc.
To help you see which type of digital source is playing, the Surround Mode Indicators ˘ in combination with the Information Display ˜ also serve as bitstream indications to show which type of bitstream is present, as well as the sur- round mode in use, if applicable.
DOLBY D: When the green LED next to the Dolby Digital or Dolby Digital EX mode is lit, a Dolby Digital bitstream is being received.
Depending on the audio track selected on the source player and number of channels on the disc, different surround modes are possible. Note that only one channel without subwoofer, called ”1.0” audio, or all five channels with subwoofer (”5.1” audio) or all steps between can be record- ed on digitally surround encoded audio tracks (see NOTE below). With all those tracks, except ”2.0” audio, only the Dolby Digital and VMAx modes are available. When the Dolby Digital sig- nal is only two channel (”2.0”) these two chan- nels (l and r) often contain Pro Logic surround informations.
With those tracks the AVR 5550 automatically switches to the Dolby Pro Logic II Movie mode (in addition to the Dolby Digital mode), but you may also select the Vmax mode. When the D.D. 2.0 signal contains no Pro Logic information, the pure Dolby Digital mode will be selected auto- matically, but you may also select any Pro Logic II mode (only Music or Emulation should be used then) or any Vmax mode.
DTS: When the green LED next to the DTS logo is lit, a DTS bitstream is being received. When the unit senses this type of data, only the applicable mode may be used.
PCM: When the green LED next to the word DIGITAL is lit, a standard Pulse Code Modulation, or PCM, signal is being received. This is the type of digital audio used by conventional compact disc and laser disc recordings. When a PCM bitstream is present, all modes except Dolby Digital and DTS are available.
®
:When the letters HDCD appear on the Lower Display Line B in conjunction with the PCM indicator, the CD that is playing is encoded using the special High Definition Compatible Digital® process. HDCD® discs use
20-bit encoding and other proprietary processing to provide the ultimate in CD listening. Note that HDCD processing is only available in the Stereo (Surround Off) mode.
MP3: When MP3 appears on the Lower Display Line B, a compatible MPEG 1/Layer 3 digital signal is being received. This is the popular audio format used by many computer programs for recording compressed audio files. When an MP3 bitstream is present, the sound will automatically be played in the stereo (Surround Off) mode. The surround modes are not available during MP3 playback.
Speaker/Channel Indicators
In addition to the Bitstream Indicators, the AVR 5550 features a set of unique channel-input indicators that tell you how many channels of digital information are being received and/or whether the digital signal is interrupted.
(See Figure 9).
Figure 9