Alesis ADAT-HD24EC2 Скачать руководство пользователя страница 1 | Manualshive

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EC-2

96kHz Sample Rate Upgrade

A/D and D/A Converter Cards

for the ADAT HD24 Hard Disk Recorder

O

WNER

’

S

M

ANUAL

V

ERSION

1.0

A

PPLIES TO

ADAT HD24

SOFTWARE

V

ERSION

1.05

AND ABOVE

1
2
3
...
»

Содержание ADAT-HD24EC2

Страница 1: ...EC 2 96kHzSampleRateUpgrade A DandD AConverterCards fortheADATHD24HardDiskRecorder OWNER SMANUAL VERSION1 0 APPLIESTOADATHD24SOFTWAREVERSION1 05 ANDABOVE ...

Страница 2: ...EC 2 96kHz A D D A upgrade appendix A EC 2 Manual 2002 Alesis All rights reserved Reproduction in whole or in part is prohibited Specifications Subject To Change Without Notice 7 51 0107 A 6 2002 ...

Страница 3: ...and digital mixers 11 Using the HD24 EC 2 with the Alesis AI 4 AES EBU Interface 12 Specifications 13 Index 12 channel operation 6 AES EBU Digital Audio Interface 12 Analog Input A D board 5 Analog Output D A board 5 Antialiasing filters 8 anti static during installation 4 converters 8 daughterboard 3 DC power cable 6 Digital inputs and outputs at high sample rates 6 digital mixers at high sample ...

Страница 4: ...ts In high sample rate mode the HD24 can record and play back up to 12 tracks at a time The EC 2 expansion cards are designed for use only with HD24 software version 1 05 or higher If your HD24 has a lower software version visit our web site at www alesis com to download the latest HD24 software and instructions for updating the HD24 via a standard MIDI file or via Ethernet If you don t have a com...

Страница 5: ...t you have everything in this packing list When you unwrap the components save the packing materials so you can use them to store the original parts Overview In the HD24 the conversion between analog and digital signals takes place on two PCBs printed circuit boards that are mounted directly to the input A D and output D A connectors that poke through the back panel In a stock HD24 without 96 kHz ...

Страница 6: ...he tab lock holding the white connector to the back of Drive 1 and carefully disconnect it Do the same for the connector on Drive 2 the Main PCB the printed circuit board on the floor of the HD24 and finally the power supply itself This will be replaced with a new cable in step 14 4 Disconnect the 26 pin flexible ribbon cables from the existing converter PCBs and the main PCB and remove them compl...

Страница 7: ... installed 10 Get the new Analog Output D A PCB from its packaging Remove the nuts and washers from the 1 4 connectors on the new Analog Output D A PCB NOTE The Analog Input and Analog Output PCBs look very similar Verify that you have the correct PCB by looking for the part number and part name in the text in the corner of the PCB 11 Place the Analog Output PCB in the bottom set of rear panel hol...

Страница 8: ...ng each then trying again to see if the EC 2 is detected Contact Alesis Product Support or an authorized service center if the cards are still not detected Using the EC 2 For important information about high resolution operation of the HD24 see Chapter 7 of your ADAT HD24 owner s manual page 65 About 96kHz 88 2kHz Sampling Operation An ADAT HD24 with EC 2 upgrade boards installed operates identica...

Страница 9: ...ay appear or the sample rate indicator may flash indicating the mismatch in rates but this will not affect operation Inputs and Outputs The inputs and outputs of the HD24 EC 2 are the same basic type as on a stock HD24 balanced 1 4 TRS jacks with a nominal 4 dBu level corresponding to 15 dBFS on the HD24 s meter In most installations there will be no difference in meter readings or levels after yo...

Страница 10: ...d to the ADAT Optical ports of the HD24 have a tough time beating the specs of the EC 2 With proper recording techniques any noise or hiss you hear is coming from the self noise of the microphones or preamps not from the HD24 When to use 88 2 96 kHz Why 44 1 48 kHz Many engineers believe that the sampling rates that have been used up to now are less than ideal The industry standard sample rates we...

Страница 11: ...e quantum improvements in the design of A D and D A converters Key among these was the development of digital oversampling filters To vastly oversimplify an oversampling filter sets its sampling frequency at a high multiple originally 8 times now usually 64 or 128 times of the final sampling frequency Then most of the filtering takes place digitally by throwing out the extra samples A digital reco...

Страница 12: ...al to low noise operation so in some cases your best bet is to bypass the console during tracking and save it for only the final mix Plug high grade microphone preamps directly into the balanced inputs of the HD24 EC 2 Or have your console custom modified to raise its low pass point by someone who understands the tradeoffs between noise stability and frequency response For listening to a high samp...

Страница 13: ... lightpipe as a high speed 4 channel interface the workstation will use it as the traditional standard speed ADAT Optical 8 channel interface If that s the case you ll get apparently duplicate signals on the device receiving signal from the HD24 in 96 kHz mode Track 1 will appear on channels 1 and 2 of the digital mixer or workstation etc In some cases you need to manually set the other device to ...

Страница 14: ...he only difference at the high sample rates is that a second pair of ADAT Optical cables must be used to connect the ADAT OPTICAL 9 16 jacks on the back of the HD24 to the ADAT OPTICAL 5 8 jacks on the back of the AI 4 This is because the ADAT Optical interface transmits four channels of high speed data in the space used for eight channels of standard speed data Remember that if you re transferrin...

Страница 15: ...nected to unbalanced circuit Output impedance 220 Ω D A converter AKM 4393 Analog filter 2nd order Butterworth filter w 96 kHz corner frequency Latency digital in to analog out Approximately 32 samples 0 7 ms 48 kHz AUDIO PERFORMANCE Signal to Noise Ratio 112 dB A Weighted Analog In to Analog Out THD N 0 002 Frequency Response 22 44 kHz 0 50 dB Throughput delay analog in to analog out Approximatel...

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