Huron & SNAP Documentation

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HURON TECHNICAL REFERENCE • Always use the pre-amplifier in preference to the volume control to boost lower level analogue inputs. It is always preferable to increase the analogue signal level as much as possible at the pre-amplifier to avoid an unnecessary noise contribution at the input to the volume control. • Always aim to provide a near full scale input signal to the A/D converter, by using the appropriate gain settings in the pre-amplifier and the volume control. • The volume control should not generally be used to attenuate the analogue input signal. Any reduction in the signal level through the volume control may mean that clipping at the pre-amplifier output, due to excessive input signal level, will go undetected at the A/D input. The following analogue input control settings are recommended: Input signal type Typical signal Pre-amplifier Volume level setting Control setting Professional Line Level +20dBm 0dB 0dB Professional Line Level +14dBm 0dB 6dB Consumer Line Level +0dBm 20dB 0dB Dynamic Microphone -20dBm 40dB 0dB Audio Output Levels The digital output module in the system contains an 18-bit D/A converter and a volume control to provide the capability for driving analogue output levels less than the maximum 20dBm. The analogue outputs are electronically balanced. A schematic of the audio output circuit (on the D/A module) is shown below: Figure 107 — D/A output schematic The volume control settings on the D/A modules are manipulated by the upper row of sliders in the I/O Manager Tool. The following recommendations apply to the use of the D/A output module: • Always aim to supply a digital signal to the D/A converter that is close to full scale signal levels. If the digital output signal is scaled down significantly below full scale, it will lead to a reduction in the signal-to-noise performance of the D/A converter. HURON TECHNICAL MANUAL PAGE 302
HURON TECHNICAL REFERENCE • In general, the volume control should only be used to reduce the output level (-90 ... 0dB), and boosting the analogue output (+0.5dB … +30dB) is not recommended. This is because boosting the analogue output may cause clipping at the balanced line driver. • Ideally, the analogue output should be driven at the maximum possible level. For example, if the analogue output is intended to connect to a system that allows selectable gain on its input, it is always recommended that the lowest gain is selected at the receiving device and that the signal level generated by the output is increased. The following analogue output control settings are recommended: Output signal type Typical signal level D/A Volume Control required setting Professional Line Level +20dBm 0dB Professional Line Level +14dBm -6dB Consumer Line Level +0dBm -20dB Headphones driven directly by D/A -30 ... -10dBm (typical Adjust for comfortable level module Power amplifier driven from system[1] Note: If the power amplifier provides a volume control, refer to the next section for more information regarding the best settings for the D/A volume control and the amplifier gain. level) -30 ... -10dBm (typical level) Connecting Outputs to a Power Amplifier with Gain Control Adjust for comfortable level When an analogue output is connected to a power amplifier that also provides gain control, then the power level at the amplifier output can be increased or reduced by varying either the output volume, or the amplifier input volume. There are two common scenarios for this situation: 1. In applications where the user wishes to control the volume of the amplifier output by adjusting the amplifier gain control. Optimum noise performance will be achieved by setting the analogue output level from the system to the standard line levels (0dBm for consumer equipment or +14/+20dBm for professional equipment), and then setting the amplifier gain control to set the desired listening level. 2. In applications where the user wishes to control the level of the amplifier output from the Windows controls in VRack, then the power amplifier needs to be set to a suitable gain level. If the power amplifier gain is set too high, then the output level will need to be lowered to compensate, resulting in a situation where any noise at the outputs of the system or at the input to the amplifier will be accentuated. HURON TECHNICAL MANUAL PAGE 303
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Huron Technical Manual Software ver
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Copyright © 1995-2003 Lake Technol
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FCC Declaration (USA only) for Huro
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Table of Contents DISCLAIMER.......
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TABLE OF CONTENTS FEATURES ........
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TABLE OF CONTENTS OPERATION .......
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TABLE OF CONTENTS DC BLOCK.........
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TABLE OF CONTENTS THE 96KHZ EQ ....
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Introduction to the Huron Thank you
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Features Applications Note: Any ISA
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INTRODUCTION TO THE HURON • Optio
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Installing New Hardware Components
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↓ To change the ISA memory addres
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↓ Connecting with the patch panel
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Huron System Tools Huron Simulation
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General Installation ↓ To install
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Introduction to the System Tools Th
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Operation Starting ↓ To start the
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Configuration Functions Internal/Ex
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Displaying, Hiding and Terminating
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Stopping VRack ↓ To exit the VRac
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Patching ↓ To connect a pair of p
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Tip: Even if two patch points are c
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Introduction Features The IO Manage
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Adjusting Volumes ↓ To adjust the
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↓ To set a digital output to prof
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↓ To close a split window Summary
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THE SIMULATION TOOLS InsideTrak, Fa
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THE SIMULATION TOOLS • Angle chan
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Z THE SIMULATION TOOLS Figure 22
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Features Operation Object list Add
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For example: if a Source Object (ch
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Editing a BinScape Object ↓ To ed
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Features Operation The Space Array
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Adding an Object to the Space Array
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Near Field Adding B-format Input Se
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Inserting speakers ↓ To insert a
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Summary 25 20 15 Number of inputs S
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The simulated acoustic spaces used
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↓ To access the Sound Field Filte
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Directivity Factor Name d = 0.000 O
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Setting Minimum Source Distance ↓
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Adding, Inserting, Removing and Edi
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DSP Usage Summary THE SIMULATION TO
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↓ To access the Binaural Decoder
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Summary THE SIMULATION TOOLS • Th
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Starting ↓ To access MultiScape F
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Editing a Sound Object ↓ To edit
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B-format Decode Mode B-format Mode
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Editing Headphone Objects ↓ To ed
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Adding Rooms, Deleting Rooms Adding
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Summary THE SIMULATION TOOLS • Mu
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Starting ↓ To access HeadScape Se
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Configuring HeadScape ↓ To config
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Summary THE SIMULATION TOOLS • He
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Scene (List of Tracks) Track (List
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Figure 45 - Scene Properties dialog
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Manipulating Tracks ↓ To add a tr
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↓ Exporting a trajectory to a Loc
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Other Simulation Tools This sub-sec
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Locator Commands Loading and Playin
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Features Requirements The WavePlaye
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Figure 49 — The WavePlayer-2 inte
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↓ Setting the RME Hammerfall as t
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Note: The Waveplayer has now been s
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Summary OTHER SIMULATION TOOLS •
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↓ To select a microphone setting
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↓ To specify the Echo settings
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Integration under 32 bit Windows In
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Positional Commands Note: The numbe
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OTHER SIMULATION TOOLS SNAPGetRooms
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MultiScape Commands Parameter Descr
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Space Array Commands Parameter Desc
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VMixer Commands Parameter Descripti
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WavePlayer-2 Commands OTHER SIMULAT
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OTHER SIMULATION TOOLS SNAPWP2Pause
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OTHER SIMULATION TOOLS SNAPSetWaveH
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Command Reference This section desc
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WavePlayer Commands OTHER SIMULATIO
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TCP/IP Commands OTHER SIMULATION TO
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Introduction Features Overview of t
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Operation Starting and Saving ↓ T
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↓ To add a FIR filter to the Filt
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Currently selected patch point icon
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Introduction 96kHz Convolver Hardwa
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Patching the 96kHz Convolver Loadin
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Starting Note: If using measure to
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Selecting the Output File ↓ To se
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Signal Generation via MatLab Script
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Introduction 96kHz Measurement Tool
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Loading the 96kHz Measurement Tool
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; comments ( (dtype [bit16 | bit20
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Introduction Operation Starting ↓
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Dfilter Windows Interface ↓ To st
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Lvec Windows Interface ↓ To start
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Padvec Windows Interface ↓ To sta
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Permute Windows Interface ↓ To st
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Wingen Windows Interface ↓ To sta
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SigGen Windows Interface ↓ To sta
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↓ To generate a piecewise linear
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Vector Arithmetic Windows Interface
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Introduction Features Operation ↓
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Printing ↓ To print the SIM file
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Altering the Axes ↓ To display sa
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Summary THE ENGINEERING TOOLS • P
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Note: In this version of SimScale i
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Usage Simtowav Simtowav is a comman
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Hamming Window Blackman Window Harr
Page 251: Introduction to the Programming Too
Page 254 and 255: Operation Starting Lake EQ ↓ To a
Page 256 and 257: Slider Widget Toolbar Creating an E
Page 258 and 259: High Shelf Tip: All the sliders can
Page 260 and 261: Calculating the Equalisation Curve
Page 262 and 263: ↓ To lock a Slider ↓ To unlock
Page 264 and 265: Limits ↓ To alter the graph limit
Page 267 and 268: Introduction 96kHz EQ Hardware Requ
Page 269: Loading EQ 96kHz THE EQUALISATION T
Page 273 and 274: Features Operation The VMixer The V
Page 275 and 276: Note: When increasing the size of V
Page 277 and 278: Muting ↓ To mute all output chann
Page 279 and 280: Operation Starting ↓ To access th
Page 281 and 282: Operation Starting ↓ To access th
Page 283: Summary OTHER TOOLS • The BFormat
Page 286 and 287: I/O Test Patching Selecting the For
Page 288 and 289: Summary • To utilise I/O Test an
Page 291 and 292: Fixed Point Digital Audio Data Repr
Page 293: ↓ SimScale Avoiding Large Frequen
Page 296 and 297: Figure 99 — SNR of the 16 bit A/D
Page 298 and 299: Mechanical Specifications 1 3 Figur
Page 301: Audio Input Levels Managing Audio S
Page 305 and 306: Angle Channels Glossary Angle chann
Page 307 and 308: Order of Reflections HURON TECHNICA
Page 309: SNR (Signal to Noise Ratio) HURON T
Page 312: ↓ To specify an auto-logon domain
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