Telex ISP-100 8-17

8-17

Processing Components - Crossover

Four-Way Crossovers

Figure 8-8

Four-way crossover implementation.

In the ISP-100, 4-way crossovers are implemented as shown in

Figure 8-8.

This parallel structure was selected over the more common binary-

tree structure for its suitability to the distribution of filters among

multiple DSPs. The parallel structure is also capable of perfect

implementation of Linkwitz-Riley crossovers, for which the ISP-100

has been optimized. The filters marked optional in Figure 8-8 will be

explained in the Linkwitz-Riley Crossover section.

The lowpass filters LPx (except for the optional LP2) and the

highpass filters HPx (except for the optional HP2) may each be

independently configured as:

Bessel 6 dB/octave (1st-order)

Bessel 12 dB/octave (2nd-order)

Bessel 18 dB/octave (3rd-order)

Bessel 24 dB/octave (4th-order)

Butterworth 6 dB/octave (1st-order)

Butterworth 12 dB/octave (2nd-order)

Butterworth 18 dB/octave (3rd-order)

Butterworth 24 dB/octave (4th-order)

Linkwitz-Riley (Butterworth-Squared) 12 dB/octave (2nd-order)

Linkwitz-Riley (Butterworth-Squared) 24 dB/octave (4th-order)

In addition, the cutoff frequency, attenuation, and polarity in the low

band, the low-mid band, the mid-high band, and the high band may

be independently adjusted, and all of the filters in any band may be

bypassed entirely.

The cutoff frequency in each filter is continuously variable from 20

Hz to 20 kHz.

Contents

Main Page Page ii CUSTOMER SUPPORT RETURN SHIPPING INSTRUCTIONS Procedure for Returns Shipping to Manufacturer for Repair or Adjustment iii End-User License Agreement for Telex Software iv INTRODUCTION .................................................................... 1-1 SETUP & INSTALLATION...................................................... 2-1 TROUBLESHOOTING ............................................................ 3-1 SPECIFICATIONS .................................................................. 4-1 v vi INSTALLING VUE-IT........................................................... 5-1 GETTING STARTED............................................................... 6-1 USING VUE-IT .......................................................................7-1 vii PROCESSING COMPONENTS ...............................................8-1 viii ix Page 1-1 INTRODUCTION An Overview of the ISP-100 1-2 2-1 SETUP & INSTALLATION Introduction Unpacking Front Panel Features (see Figure 2-1) 2-2 Rear Panel Features (see Figure 2-2) Power Requirements Operating Environment Rack Mounting 2-3 Card Installation Procedure 2-4 Cable Diagrams 2-5 2-6 2-7 2-8 2-9 Page 3-1 TROUBLESHOOTING User Modifications In Case of Problems 3-2 Diagnostics Factory Default Mode 3-3 Retrieving Version Numbers Retrieving Serial Numbers 3-4 Changing the Fuse Changing the Battery WARNING: 3-5 3-6 Technical Support Procedure for Returns 3-7 Shipping to Manufacturer for Repair or Adjustment Page 4-1 SPECIFICATIONS Components 4-2 4-3 ISP-100 Component Plots Page Page 4-6 MIM-1 & MIM-2* Analog Input Modules * MIM-2 differences parenthetically noted. (Unless otherwise specified measurements are at unity gain with +16 dBu signal. 4-7 MOM-1 Analog Output Module 4-8 MDM-1 AES/EBU Digital I/O Module (Sample Rate Converter Engaged) 4-9 (Sample Rate Converter bypassed) 4-10 Physical Power 5-1 INSTALLING VUE-IT NOTE: Minimum System Requirements Identifying a Serial Port 5-2 Updating the ISP-100s Operating System 5-3 5-4 Configuring the Software 5-5 Page 6-1 GETTING STARTED Starting VUE-IT 6-2 Starting a New Project 6-3 VUE-IT File System 6-4 7-1 Using VUE-IT File (see Figure 7-1) 7-2 Edit (see Figure 7-2) Options (see Figure 7-4) Tools (see Figure 7-3) 7-3 7-4 System Configurations (see Figure 7-8) 7-5 Project Manager 7-6 7-7 7-8 7-9 7-10 QuickSET Manager 7-11 GPI 7-12 7-13 QuickMAP QuickMAP Component Bypassing 7-14 I/O Properties (see Figure 7-21) 7-15 7-16 Note: 7-17 Device Status Panel Page 8-1 PROCESSING COMPONENTS 8-2 Combine 8-3 8-4 Compressor 8-5 8-6 8-7 8-8 8-9 8-10 8-11 Crossover 8-12 8-13 8-14 8-15 8-16 Journal of the Audio Engineering Society 8-17 8-18 8-19 Journal of the Audio Engineering Society 8-20 8-21 8-22 8-23 8-24 Cut 8-25 8-26 Delay 8-27 Dither 8-28 8-29 Filter 8-30 8-31 8-32 8-33 8-34 8-35 Journal of the Audio Engineering Society 8-36 8-37 8-38 8-39 Gain 8-40 Page 8-42 Gate 8-43 8-44 8-45 8-46 Limiter 8-47 8-48 each 8-49 not 8-50 8-51 8-52 Select A-1 GLOSSARY A-2 A-3 Page B-1 STANDARD QUICKMAPS Identification of Slots and Connectors Applying QuickMAPs