Telex DOC02-DN9848 specifications Audio Precision 1st order allpass @ 300, 1K, 10K 01/19/01

Page 38

Application Notes

Audio Precision

 

 

1st order allpass @ 300, 1K, 10K

 

01/19/01 16:00:02

 

+150

 

 

 

 

 

 

 

 

+150

 

 

+100

 

 

 

 

 

 

 

 

+100

 

 

+50

 

 

 

 

 

 

 

 

+50

 

d

+0

 

 

 

 

 

 

 

 

+0

d

e

 

 

 

 

 

 

 

 

e

g

 

 

 

 

 

 

 

 

 

 

g

 

-50

 

 

 

 

 

 

 

 

-50

 

 

-100

 

 

 

 

 

 

 

 

-100

 

 

-150

 

 

 

 

 

 

 

 

-150

 

 

20

50

100

200

500

1k

2k

5k

10k

20k

 

 

 

 

 

 

 

Hz

 

 

 

 

 

Color

Line Style

Thick

Data

Axis

 

 

 

 

 

Green

Solid

1

Anlr.Phas e

Left

Yellow

Solid

1

Anlr.Phas e

Right

Yellow

Solid

1

Anlr.Phas e

Left

phas e.at1

Response of the All Pass Filter for 1st Order phase shift at frequencies of 300Hz, 1kHz and 10kHz

The response of the filter for a 2nd order shift is shown below with the Q control set to 1, at frequencies of 300Hz, 1kHz, and 10kHz, and also Q set to 6 (max) and 0.4 (min) at 1kHz. As can be seen, the filter response now tends from 360 at low frequencies to 0 at high frequencies, and Q controls the rate at which the phase changes (i.e. the slope) around the transition point. With low Q, the phase changes gradually across the whole frequency range. With high Q, the phase changes rapidly in the transition area, and is unchanging at 360°/0° over the remainder of the frequency spectrum. Hence, the 2nd order all-pass provides the user with the additional control of shaping the phase shift ‘window’.

Audio Precision

2nd order allpass Q=1 @ 300, 1K, 10K + Q=6

Q=0.4

01/19/01 16:09:11

 

 

 

 

 

@ 1K

 

 

 

 

 

 

 

+400

 

 

 

 

 

 

 

 

+400

 

 

+300

 

 

 

 

 

 

 

 

+300

 

d

+200

 

 

 

 

 

 

 

 

+200

d

 

 

 

 

 

 

 

 

 

 

e

+100

 

 

 

 

 

 

 

 

+100

e

g

 

 

 

 

 

 

 

 

g

 

 

 

 

 

 

 

 

 

 

 

+0

 

 

 

 

 

 

 

 

+0

 

 

-100

 

 

 

 

 

 

 

 

-100

 

 

-200

50

100

200

500

1k

2k

5k

10k

-200

 

 

20

20k

 

 

 

 

 

 

Hz

 

 

 

 

 

 

Color

Line Style

Thick

Data

Axis

 

 

 

 

 

Green

Solid

1

Anlr.Phase

Left

Yellow

Solid

1

Anlr.Phase

Right

Yellow

Solid

1

Anlr.Phase

Left

phase.at1

Response of the all pass filter for 2nd order phase shift with Q=1 at frequencies of 300Hz, 1kHz and 10kHz and also with Q=6 at (max) and Q=0.4 (min) at 1kHz

Note: Both filters are all-pass with a flat amplitude response between 20Hz and 20kHz; only the phase response changes with frequency.

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Contents Page Page Important Safety Instructions Page Declaration of Conformity Page Contents Technical Specification After Unpacking Safety WarningInstallation Considerations Page DN9848 Key Features Introducing the DN9848Controls, Connectors, Indicators Front PanelRear Panel DN9848 Programming Panel Programming SettingsDN9848 Menu System Navigating the DN9848 MenusHome Set Up MenuStore and Recall DN9848 Menu Map Brief Technical Overview Setting Input ParametersInput Channels Input ChannelsTo adjust the gain Gain and DelayTo set the delay Parametric Equalisation Pages 2 toCompression Monitoring the Input SignalTo switch the compressor out of the circuit To set the compressor parametersOutput Channels Output ChannelsNaming the Output Channel Setting Output ParametersTo access the Output menu pages for a particular channel RoutingTo invert the output signal Signal Invert, Delay and Output LevelPhase Adjustment Pages 4 To set a precise phase shift at a reference frequencyTo add a high/low pass filter to output processing To apply a ‘shaped’ phase transition at a chosen frequencyHigh Pass and Low Pass Filters Pages 6 To bypass the high/low pass filter processingParametric Equalisation Pages 2 to Output Limiter Monitoring the Output SignalTo switch the limiter out of the circuit To set the limiter parametersOutput Gain and Mute Front Panel Control General Security and other Set Up OptionsSecurity Settings Pages 2 Remote Comms ChannelTo set a Panel Lock When System Protect is onSystem Protect To remove the Panel LockTo adjust the lighting To switch System Protect onTo switch System Protect off LCD LightingTo change the units of measurement Delay OptionsPower Up Options To store settings Using the DN9848 MemoriesStoring and Recalling Settings To lock the system memories, refer to .3 Security SettingsTo recall stored settings from memory Press the black Recall button to access the Recall menuRemote Control Setup DN9848 Remote Control SetupRS-485 input to rear panel To disable remote controlDN9848 Connection Laptop/PC Cable /Converter Required Application Notes Application NotesAdvantage of DN9848 Look-Ahead Limiters Application Notes Phase-adjustment with the DN9848 Audio Precision Deg phase shift @ 20, 300, 1K, 20K 01/19/01Audio Precision 1st order allpass @ 300, 1K, 10K 01/19/01 Technical Specification Technical SpecificationPower Requirements Factory Presets for X-Array Series Memory Out Identification P08 XI1122/85 4MIX R1-2 Factory Presets for X-Line Series Memory Out Identification Memory Out Identification

DOC02-DN9848, DN9848 Loudspeaker Processor specifications

The Telex DOC02-DN9848, commonly referred to as the DN9848 Loudspeaker Processor, is an advanced audio processing device designed to enhance sound quality in both live and recorded environments. With a sleek and modern design, the DN9848 is engineered to meet the demanding needs of professional audio applications, be it in concert venues, theaters, or broadcast studios.

One of the key features of the DN9848 is its comprehensive processing capabilities. Equipped with a powerful DSP (digital signal processing) engine, it offers extensive equalization options, dynamic range control, and advanced crossover functionality. The device utilizes up to 48 input and output channels, allowing for unparalleled flexibility in routing audio signals. This makes it ideal for installations that require precise control over multiple loudspeakers.

The DN9848 also boasts an intuitive user interface, which facilitates straightforward navigation through its various functions. The front panel features a large LCD display that provides clear visibility of parameters, and a selection of knobs and buttons enables easy adjustments. For remote operation, the device can be controlled via Ethernet, allowing technicians to make changes from virtually any location.

Another standout aspect of the DN9848 is its customizable algorithms that accommodate different speaker systems and acoustical environments. Users can fine-tune the processor to optimize performance for specific venues or loudspeakers. The device supports both FIR (finite impulse response) and IIR (infinite impulse response) filters, providing users with the flexibility to deploy advanced filtering techniques according to their needs.

The DN9848’s robust connectivity options further enhance its utility. It features standard analog XLR connectors, as well as digital interfaces that include AES/EBU and Dante. This multi-format compatibility ensures seamless integration into existing audio setups, making it a versatile choice for audio professionals.

In terms of reliability and durability, the DN9848 is built to withstand the rigors of the professional audio world. Its rugged chassis and high-quality components ensure that it can perform consistently in various conditions, making it a trusted partner for sound engineers.

In summary, the Telex DOC02-DN9848 Loudspeaker Processor combines sophisticated audio processing capabilities with user-friendly features and robust connectivity. Its advanced technology and flexible options make it an indispensable tool for achieving optimal sound in a variety of professional audio environments.
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