Harman-Kardon AVR80 Delay Time Adjust, Direct Digital Decoding, Advanced Features, digital output

AVR80 manual 11/01/98 13:01 Side 29

Advanced Features

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ENGLISH

To create a simulcast recording first select the video source input (TV, LD, VCR 2, AUX) using the input selection buttons on the remote control or front panel. 78c Next, select the audio source (FM /AM, CD or TAPE 2) 346 . Note that the on screen menu display will show the split sources (Figure # 7). The front panel display will show the audio source in large letters in the main portion of the Information Display, while the video source will appear in smaller letters next to the VISUALÁ indicator. Once the split source is configured, select SOURCE as the input for VCR1 by pressing the VCR1 COPY button ñon front.

Delay Time Adjust

One aspect of the surround modes is the delay of audio signals between the front speakers and the rear speakers. Each surround mode is factory preset with a specific delay time, but it is possible to individually adjust the delay timing to custom tailor the sound to your individual taste and the acoustic conditions in your listening room or home theater.

The factory setting is appropriate for most rooms, but some installations create an uncommon distance between the front and surround speakers that may cause the arrival of front channel sounds to become disconnected from surround channel sounds.

To re-synchronize the front and surround channels, follow these steps:

1.Measure the distance from the listening/viewing position to the front speakers (in meters).

2.Measure the distance from the listening/viewing position to the surround speakers.

3.Subtract the distance to the surround speakers from the distance to the front speakers and add 5. Multiply the result with 3, the resulting number is the ideal delay time (in ms) for your room. For example, if the front speakers are 7 m away and the surround speakers are

2m away, the formula will be (7–2+5)x3 =30. Thus, the correct delay time in this room would be 30ms.

NOTE: The delay time may only be adjusted in certain modes.

If the delay time needs to be changed, it may be increased by pressing the DELAY button @pon the front panel. The delay time will be briefly displayed on the video menus as well as the front panel.

In addition to the use of the delay time formula, it is a good idea to understand the features of each of the AVR80’s surround modes when entering delay time. The chart on a following page provides an explanation of the suggested for each mode. The chart also contains the delay time limits for each of the modes.

Direct Digital Decoding

The AVR80’s digital signal processing uses sophisticated microprocessors and advanced digital audio engines that manipulate sound in the digital domain. In order to work with sound, these circuits must first convert the incoming analog audio input to a digital signal. After processing, the digital audio signal must be converted back to analog for volume control and amplification.

While the digital to analog (D/A) and analog to digital (A/D) circuits in the AVR80 are high quality, any time an audio signal is digitized or reconstructed to analog there is the possibility of quality loss. Thus the Direct Digital input of the AVR 80 helps you to avoid un-needed A/D and D/A conversion at least in Surround modes from any laser disc player equipped with a coaxial

digital output.

If your player has this type of output, connect the LD player to the AVR80 with a high quality digital interconnect (110 ohm cable with RCA plugs). The connection should be made to the LD DIGITAL IN jack Son the rear panel.