Denon AVR-2803/983 manual Dolby Surround, Dolby Digital and Dolby Pro Logic

The AVR-2803/983 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, Doiby 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.

•Dolby Digital and Dolby Pro Logic

Comparison		of	home	surround	systems	Dolby	Digital	Do]by Pro Logic
No	recorded	channels		(elements)		51	ch	2	ch
No	playback	channels				51	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 Do]by Surround
					Dolby	Diggal encoding/decoding
High	frequency		playback limit		of surround	20	kHz	7 kHz
channel

• Dolby Digital compatible media and playback methods
Marks indicating Dolby Digital compatibility:	I'_n_	.
	DI G i'r&l.

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			iack	Set the input mode to "AUTO"
							_ 1	{Page 42)
DVD	Optical	or coaxial		digital	output		Set the	input mode to	"AUTO"
	(same as for		PCM)		_	2		{Page 42)
Others	Optical	or coaxial		digital	output		Set the	input mode to	"AUTO"
{satellite broadcasts, CATV, etc)	(same as for			PCM)				{Page 42)

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-2803/983, 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-2803/983.

(2)Dolby Pro Logic I1

•Dolby Pro Logic II is a new multi-channel playback format developed by Dolby Laboratories using feedback logic steering technology and offering improvements over conventional Dolby Pro Logic circuits.

•Dolby Pro Logic I] can be used to decode not only sources recorded in Do]by Surround (-_ ) but also regular stereo sources into five channels (front left, front right, center, surround left and surround right) to achieve surround sound.

•Whereas with conventional Dolby Pro Logic the surround channel playback frequency band was limited, Dolby Pro Logic I1 offers a wider band range (20 Hz to 20 kHz or greater). In addition, the surround channels were monaural {the surround left and right channels were the same) with previous Dolby Pro Logic, but Dolby Pro Logic II they are played as stereo signals.

•Various parameters can be set according to the type of source and the contents, so it is possible to achieve optimum decoding (see page 5O).

Sources recorded in Dolby Surround

These are sources in which three or more channels of surround have been recorded as two channels of signals using Dolby Surround encoding technology.

Dolby Surround is used for the sound tracks of movies recorded on DVDs, LDs and Video cassettes to be played on stereo VCRs, as well as for the stereo broadcast signals of FM radio, TV, satellite broadcasts and cable TV.

Decoding these signals with Dolby Pro Logic ]I makes it possible to achieve multi-channel surround playback. The signals can also be played on ordinary stereo equipment, in which case they provide normal stereo sound.

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