Denon AVR-2805 manual 57

DTS 96/24

The sampling frequency, number of bits and number of channels used for recording of music, etc., in studios has been increasing in recent years, and there are a growing number of high quality signal sources, including 96 kHz/24 bit 5.1-channel sources.

For example, there are high picture/sound quality DVD video sources with 96 kHz/24 bit stereo PCM audio tracks. However, because the data rate for these audio tracks is extremely high, there are limits to recording them on two channels only, and since the quality of the pictures must be restricted it is common to only include still pictures.

In addition, 96 kHz/24 bit 5.1-channel surround is possible with DVD audio sources, but DVD audio players are required to play them with this high quality.

DTS 96/24 is a multi-channel digital signal format developed by Digital Theater Systems Inc. in order to deal with this situation.

Conventional surround formats used sampling frequencies of 48 or 44.1 kHz, so 20 kHz was about the maximum playback signal frequency. With DTS 96/24, the sampling frequency is increased to 96 or 88.2 kHz to achieve a wide frequency range of over 40 kHz.

In addition, DTS 96/24 has a resolution of 24 bits, resulting in the same frequency band and dynamic range as 96 kHz/24 bit PCM.

As with conventional DTS Surround, DTS 96/24 is compatible with a maximum of 5.1 channels, so sources recorded using DTS 96/24 can be played in high sampling frequency, multiple channel audio with such normal media as DVD videos and CDs.

Thus, with DTS 96/24, the same 96 kHz/24 bit multi-channel surround sound as with DVD-Audio can be achieved while viewing DVD-Video images on a conventional DVD-Video player ( 1). Furthermore, with DTS 96/24 compatible CDs, 88.2 kHz/24 bit multi-channel surround can be achieved using normal CD/LD players ( 1).

Even with the high quality multi-channel signals, the recording time is the same as with conventional DTS surround sources.

What’s more, DTS 96/24 is fully compatible with the conventional DTS surround format, so DTS 96/24 signal sources can be played with a sampling frequency of 48 kHz or 44.1 kHz on conventional DTS or DTS-ES surround decoders ( 2).

1 A DVD player with DTS digital output capabilities (for CD/LD players, a player with digital outputs for conventional DTS CDs/LDs) and a disc recorded in DTS 96/24 are required.

2 The resolution is 24 or 20 bits, depending on the decoder.

AL24 Processing

2Pure Direct Mode/AL24 Processing

The AVR-2805 is equipped with a pure direct mode allowing the effects of the video and digital circuitry to be shut down when playing CDs or records to achieve the ideal environment for analog playback, resulting in extremely high quality music playback. It is also equipped with AL24 processing which compensates the input digital data to produce the near analog waveforms which would be in a nature with 24 bits quality. AL24 processing operates when PCM data such as CD is inputted.

ENGLISH

System setup items and default values (set upon shipment from the factory)

1. Auto Setup/Room EQ

Auto Setup/Room EQ

Default settings

1

Power Amp

Set this to switch the surround

Auto Setup

back channel’s power amplifier

SURROUND BACK

Assignment

for use for zone2.

2

Manual EQ

This parameter is for optimizing the Room EQ with

which the audio signals are produced

from the

All Channel and Frequency=0 dB

Setup

speakers.

3

Room EQ

Set the Room EQ setting with All or Assign for

All

Setup

each surround mode.

4

Direct Mode

Set the ON/OFF setting of Room EQ, in the case of

OFF

Setup

the surround mode is in Direct or Pure Direct.

5

Mic Input

Set this to switch the Mic Input jack for use for Mic

Mic

Select

or V.Aux L-channel input jack.

2. Speaker Setup

Speaker Setup

Default settings

Input the combination of speakers

in your

Front Sp.

Center Sp.

Subwoofer

Surround Sp.

Surround Back

system and their corresponding sizes (SMALL for

Sp.

Speaker

regular speakers, LARGE for full-size, full-range) to

1

Configuration

automatically set the composition of the signals

output from

the speakers

and the frequency

Large

Small

Yes

Small

Small / 2spkrs

response.

This parameter is for optimizing the timing with

Front L & R

Center

Subwoofer

Surround L & R

SBL & SBR

2

Delay Time

which the audio signals are produced

from the

speakers and subwoofer according to the listening

3.6 m (12 ft)

3.6 m (12 ft)

3.6 m (12 ft)

3.0 m (10 ft)

3.0 m (10 ft)

position.

Channel

This adjusts the volume of the signals output from

Front L

Front R

Center

Surround

Surround

Surround

Surround

Subwoofer

3

the speakers and subwoofer for the

different

L

R

Back L

Back R

Level

channels in order to obtain optimum effects.

0 dB

0 dB

0 dB

0 dB

0 dB

0 dB

0 dB

0 dB

4

Crossover

Set the frequency (Hz) below which the bass so of

the various

speaker is to

be output

from the

80Hz

Frequency

subwoofer.

5

Subwoofer

This selects

the subwoofer

speaker for playing

LFE

Mode

deep bass signals.

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