ENGLISH

Surround

The AVR-1705/685 is equipped with a digital signal processing circuit that lets you play program sources in the surround mode to achieve the same sense of presence as in a movie theater.

Dolby Surround(1)Dolby Digital

Dolby Digital is the multi-channel digital signal format developed by Dolby Laboratories.

Dolby Digital consists of up to “5.1” channels - front left, front right, center, surround left, surround right, and an additional channel exclusively reserved for additional deep bass sound effects (the Low Frequency Effects – LFE – channel, also called the “.1” channel, containing bass frequencies of up to 120 Hz).

Unlike the analog Dolby Pro Logic format, Dolby Digital’s main channels can all contain full range sound information, from the lowest bass, up to the highest frequencies – 22 kHz. The signals within each channel are distinct from the others, allowing pinpoint sound imaging, and Dolby Digital offers tremendous dynamic range from the most powerful sound effects to the quietest, softest sounds, free from noise and distortion.

2 Dolby Digital and Dolby Pro Logic

Comparison of home surround systems

Dolby Digital

Dolby Pro Logic

 

 

 

No. recorded channels (elements)

5.1 ch

2 ch

 

 

 

No. playback channels

5.1 ch

4 ch

 

 

 

Playback channels (max.)

L, R, C, SL, SR, SW

L, R, C, S (SW - recommended)

 

 

 

Audio processing

Digital discrete processing

Analog matrix processing Dolby Surround

Dolby Digital encoding/decoding

 

 

 

 

 

High frequency playback limit of surround

20 kHz

7 kHz

channel

 

 

 

 

 

2Dolby Digital compatible media and playback methods

Marks indicating Dolby Digital compatibility: .

The following are general examples. Also refer to the player’s operating instructions.

Media

Dolby Digital output jacks

 

Playback method (reference page)

 

 

 

 

 

LD (VDP)

Coaxial Dolby Digital RF output jack

1

Set the input mode to “AUTO”.

(Page 35)

 

 

 

 

 

 

 

 

DVD

Optical or coaxial digital output

 

Set the input mode to “AUTO”.

(same as for PCM)

2

 

(Page 35)

 

 

 

 

 

 

Others

Optical or coaxial digital output

 

Set the input mode to “AUTO”.

(satellite broadcasts, CATV, etc.)

(same as for PCM)

 

 

(Page 35)

 

 

 

 

 

1 Please use a commercially available adapter when connecting the Dolby Digital RF output jack of the LD player to the digital input jack. Please refer to the instruction manual of the adapter when making connection.

2 Some DVD digital outputs have the function of switching the Dolby Digital signal output method between “bit stream” and “(convert to) PCM”. When playing in Dolby Digital surround on the AVR-1705/685, switch the DVD player’s output mode to “bit stream”. In some cases players are equipped with both “bit stream + PCM” and “PCM only” digital outputs. In this case connect the “bit stream + PCM” jacks to the AVR-1705/685.

(2)Dolby Pro Logic IIx

•Dolby Pro Logic IIx furthers the matrix decoding technology of Dolby Pro Logic II to decode audio signals recorded on two channels into up to 6.1 playback channels, including the surround back channel. Dolby Pro Logic IIx also allows 5.1-channel sources to be played in up to 6.1 channels.

The mode can be selected according to the source. The Music mode is best suited for playing music, the Cinema mode for playing movies, and the Game mode for playing games. The Game mode can only be used with 2-channel audio sources.

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