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Pacific Microsonics HDCD Model Two User Manual

A/d converter d/a converter digital processor
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Model Two
HDCD
®
A/D Converter
D/A Converter
Digital Processor
User's Manual
Version 3.01
PN 9300-0020 Rev. C
®
Euphonix, Inc.
220 Portage Avenue, Palo Alto, CA 94306
Phone (650) 855-0400 Fax (650) 855-0410

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Summary of Contents for Pacific Microsonics HDCD Model Two

  • Page 1 Model Two HDCD ® A/D Converter D/A Converter Digital Processor User’s Manual Version 3.01 PN 9300-0020 Rev. C ® Euphonix, Inc. 220 Portage Avenue, Palo Alto, CA 94306 Phone (650) 855-0400 Fax (650) 855-0410...
  • Page 2 User’s Manual, or update the Software Version. Euphonix is committed to the ongoing support of our products and customers. If we can be of assistance in any way, please call us at (650) 855-0400, Monday through Friday, between 9:00 AM and 5:00 PM Pacific Time, or fax us at (650) 855-0410.

  • Page 3: Table Of Contents

    Table of Contents Model Two HDCD ® User’s Manual HDCD 16-bit Dithers, 37 Installation Operating Techniques, 37 Model Two Processor, 4 Limited Dynamic Range Pop or Rock, 37 Model Two Power Supply, 4 Wide Dynamic Range Jazz or classical, 38 DC Power Cable, 4 Reference AC Power Cable, 4...

  • Page 4: Model Two Processor

    Installation ® Model Two HDCD User’s Manual Initial Configuration PLEASE: Read the following installation instructions BEFORE connecting AC power! Model Two Processor The Processor should be placed in an area free from noise generating devices such as power supplies and power amplifiers. At least six inches should be provided to the rear of the unit to allow for heat dissipation and airflow.

  • Page 5: Power Up

    Installation ® Model Two HDCD User’s Manual AC power for the Model Two should be supplied by the same circuit and preferably the same power outlet group as the AC power source for other equipment, such as analog tape machines or consoles, whose outputs will be connected to the Model Two’s analog inputs. This will minimize the possibility of ground loops.

  • Page 6: Setting Analog Input Attenuation

    Installation ® Model Two HDCD User’s Manual Setting Analog Input Attenuation Analog input attenuation is set in 1 dB steps allowing a peak input signal level over the range of +24 dBu to +12 dBu to produce full scale digital record level. The Model Two is set at the factory to +18 dBu, which is a typical peak signal level (With an operating level of +4 dBu, and headroom of 14 dB, the peak level will be +18 dBu.).

  • Page 7: Analog Connections

    Installation ® Model Two HDCD User’s Manual Analog Connections Analog Input and Output connections on the Model Two are balanced, using 3-pin XLR connectors with either pin 2 or 3 set as hot (software selectable) and pin 1 as ground. Input impedance is 13 k balanced ( 6.5 k...

  • Page 8: Aes Signal Ground Isolators

    Installation ® Model Two HDCD User’s Manual For best performance, AES3 cables should have the chassis ground path isolated by a series resistor. Use of a low capacitance isolation transformer at the Model Two’s AES signal inputs, or the AES Signal Ground Isolator described below at both inputs and out- puts is also recommended.

  • Page 9: Model Two Processor Description

    Installation ® Model Two HDCD User’s Manual Model Two Processor Description The Processor is contained in a 3 R.U. (5.25”) high, 19” wide X 19.25” deep, rack mount enclosure with adjustable rear rack ears. The Processor contains the following subsystems: Analog to Digital Converter (ADC), Digital Signal Input/Output (DIO), Digital Signal Pro- cessor (DSP), Digital to Analog Converter (DAC), and Front Panel Controller (FPC).

  • Page 10: Model Two Processor Rear Panel

    Installation ® Model Two HDCD User’s Manual Processor rear panel I/O connections and Analog Input Attenuator. PUSH PUSH PUSH Word Clock RS-232 AES In AES In AES Out AES Out AES In +23+23 PUSH PUSH Analog Input Analog Output DC Power Input Connects to the DC Output on the Power Supply using (28-pin male) the supplied DC power cable.

  • Page 11: Model Two Power Supply Description

    Installation ® Model Two HDCD User’s Manual Model Two Power Supply Description The Power Supply is contained in a 14” wide X 2.5” high X 12.25” long enclosure and connects to the Processor using a 6 foot multiconductor DC power cable. To prevent ground loops from occurring between the AC power ground and audio signal ground, there is no ground connection between the Power Supply and the Processor.

  • Page 12: Setup & Operation

    Setup & Operation ® Model Two HDCD User’s Manual Model Two Rev. 3.01 Software Features 1. Precision Master Word Clock Output capability in all AD and DD operating modes. This feature greatly reduces audible D/A conversion distortion caused by digital input signal time base jitter by allowing both the A/D and D/A converters to be clocked by the Model Two’s precision internal clock.

  • Page 13: Front Panel Controls And Displays

    Setup & Operation ® Model Two HDCD User’s Manual Front Panel Controls and Displays All Processor controls, except the Analog Input Attenuator, are located on the front panel shown below: P A C I F I C M I C R O S O N I C S METER CLOCK RESET...

  • Page 14: Meter Source

    Setup & Operation ® Model Two HDCD User’s Manual justable parameters (see pages 59 and 60 in the Reference Section to set OVER indication parameters). Meter brightness is set in the Front Panel Display Menu (SETUP/MORE.../ SYSTEM/PANEL). Meter Source Meter signal sources are selected in the Operating Menu. The source options are: OUT_1 (Digital Output 1), OUT_2 (Digital Output 2), DIG_IN (Digital Input 1), except AD+DD44 and AD+DD48 Operating Modes also have DIG_IN2 (Digital Input 2).

  • Page 15: Signal Over Segments

    Setup & Operation ® Model Two HDCD User’s Manual Signal Over Segments Each channel has two red Signal Over Segments labeled OVER. The threshold and hold characteristics of each segment are independently selectable using the Meter Overload Light Menus (SETUP/MORE.../METER/OVRLD_1 or 2). The threshold for over segment #1 can be set for 1 to 4 consecutive over samples.

  • Page 16: Monitoring

    Setup & Operation ® Model Two HDCD User’s Manual Monitoring In all Operating Modes, digital signal monitoring is available at the analog outputs. Moni- tor function setup choices are shown below. For more information see the Menu Descrip- tions in the Reference section, page 40. Monitor Function Choices Menu...

  • Page 17: Graphic Display

    Setup & Operation ® Model Two HDCD User’s Manual Graphic Display The back lit Graphic Display has 7 lines of text with 40 characters per line. The display shows the current system operational, setup, and selection menus. Menu display formats are described in detail in the Reference section, page 39.

  • Page 18: System Status Indicator

    Setup & Operation ® Model Two HDCD User’s Manual System Status Indicator The System Status Indicator is a multi-color LED which shows system status. States dis- played by the Indicator are shown below: System Off Green System Status Normal Orange Non Standard Operation Non Fatal Error Flashing Red =...

  • Page 19: Operating Modes

    Setup & Operation ® Model Two HDCD User’s Manual Operating Modes The Model Two has thirteen Operating Modes that operate at either multiples of 44.1 kHz or multiples of 48 kHz, depending upon whether a base sample rate of 44.1_X or 48_X is selected in the 44.1/48 Base Sample Rate Menu.
  • Page 20 Setup & Operation ® Model Two HDCD User’s Manual NOTE: HDCD LSB code must be reinserted when producing HDCD Compact Disc or DVD- Audio release masters if HDCD signal data has been altered in any way during digital post production processing. See Digital Post Production Processing on page 30. AD_44.1 Mode In AD_44.1 Mode, the Model Two performs 44.1 kHz A/D conversion with selectable HDCD 24-bit, 20-bit, or 16-bit output.
  • Page 21 Setup & Operation ® Model Two HDCD User’s Manual DD88-44 Mode In DD88-44 Mode, the Model Two performs 88.2 kHz to 44.1 kHz sampling frequency conversion using HDCD adaptive decimation filtering. Fixed decimation filtering can also be used for special cases, such as some synthesized sources. The 44.1 kHz output word length is selectable between HDCD 24, 20, or 16-bit.
  • Page 22 Setup & Operation ® Model Two HDCD User’s Manual AD176.4 Mode In AD176.4 Mode, the Model Two performs 176.4 kHz A/D conversion with selectable HDCD 24-bit, 20-bit, or 16-bit output. A two-wire, double speed AES signal format is used for the 176.4 kHz stereo signal.
  • Page 23 Setup & Operation ® Model Two HDCD User’s Manual DD88-176 Mode In DD88-176 Mode, the Model Two performs 88.2 kHz to 176.4 kHz sampling frequency conversion using high resolution HDCD interpolation filtering. Selectable, two-wire, stan- dard speed, or single wire, double speed AES signal formats are used for the 88.2 kHz stereo input signal (SETUP/INPUT/FORMAT/1_WIRE or 2_WIRE).

  • Page 24: Presets

    Setup & Operation ® Model Two HDCD User’s Manual Presets The Model Two stores and recalls virtually all system setup parameters in labeled presets. The preset use functions are shown below. For more information on using and storing presets see pages 59, 63 and 64. Eighteen factory configured presets are installed. Preset Function Menu Location Recall...
  • Page 25 Setup & Operation ® Model Two HDCD User’s Manual Factory Preset Configurations (Suffixed values are shown only if they are different from those of the first preset listed in a column.) _________________ PRESETS:_______________________ AD1X-24 AD+DD1X AD2X-24 DD2X-24 AD1X-16* DD1X-20* DD1X-2X* DD2X-16* AD1X2416+ DD1X-16+...

  • Page 26: Using The Model Two As A Master Word Clock Generator

    Setup & Operation ® Model Two HDCD User’s Manual Using the Model Two as a Master Word Clock Generator In all AD and DD operating modes at all sampling rates, the Model Two can be configured to be a master word clock generator. This mode of operation is highly recommended be- cause it allows the Model Two’s A/D and D/A converters to be clocked directly by the Model Two’s precision internal clock, instead of by the digital input signal, when the devices that are connected to the Model Two’s digital signal inputs and outputs, such as recorders,...

  • Page 27: Recording From An Analog Source

    Setup & Operation ® Model Two HDCD User’s Manual For AD Operating Modes Multichannel “Slave”: From the Operating Menu, select the desired Base Sample Rate (SETUP/MODE/44.1_X or 48_X) and Preset Configuration (SETUP/PRESETS). From the Operating Menu, select (SETUP/INPUT/REFCLK/REFWCLK). From the Operating Menu, select (SETUP/INPUT/MON_REF/A/D_REF). For DD Operating Modes Multichannel “Slave”: From the Operating Menu, select the desired Base Sample Rate (SETUP/MODE/44.1_X or 48_X) and Preset Configuration (SETUP/PRESETS).
  • Page 28 Setup & Operation ® Model Two HDCD User’s Manual For 44.1 kHz or 48 kHz A/D conversion: Connect an analog signal source to the channel 1 and 2 analog inputs. From the Operating Menu, select (SETUP/MODE/44.1_X or 48_X) Connect AES Out 1 or 2 to the AES input of a 44.1/48 kHz digital audio recorder. Connect the AES output of the digital audio recorder to AES In 1.

  • Page 29: Setup For 44.1/48Khz A/D Conversion With Simultaneous D To D Processing

    Setup & Operation ® Model Two HDCD User’s Manual For 176.4 kHz or 192 kHz A/D conversion: Connect an analog signal source to the channel 1 and 2 analog inputs. From the Operating Menu, select (SETUP/MODE/44.1_X or 48_X) Connect AES Out 1 and 2 to double speed AES inputs 1 and 2 of a 176.4/192 kHz digital audio recorder or DAW.

  • Page 30: Digital Post Production Processing

    Setup & Operation ® Model Two HDCD User’s Manual 8. From the Operating Menu, select (SETUP/OUTPUT/OUT_2). Then select the digital output 2 word length. HDCD_24 is selected by preset AD+DD1X. 9. In the Digital Output 1 Word Length Menu (OUT_1), select the digital output 1 word length.

  • Page 31: Setup For 44.1/48 Khz To 88.2/96 Khz Interpolation & Word Length Conversion

    Setup & Operation ® Model Two HDCD User’s Manual digital signals to HDCD 24, 20 or 16-bit, 44.1/48 kHz signals using HDCD decimation. From the Operating Menu, select (SETUP/MODE/44.1_X or 48_X). From the Operating Menu, select (SETUP/PRESETS) and select either preset DD2X- 24 or DD2X-16, depending on the desired output word length.

  • Page 32: Setup For 176.4/192 Khz To 44.1/48 Khz Decimation & Word Length Conversion

    Setup & Operation ® Model Two HDCD User’s Manual Once the Model Two is set up for 44.1/48 kHz to 88.2/96 kHz interpolation, other param- eters such as Digital Input HDCD Code Detect, Digital Input HDCD_16 Decoding, Digital Output Word Length, etc. may be changed as desired. For information, see pages 46-56. Setup for 176.4/192 kHz to 44.1/48 kHz Decimation &...

  • Page 33: Compact Disc Release Mastering

    Setup & Operation ® Model Two HDCD User’s Manual 4X) signals. While DAC dither greatly improves the linearity of D/A conversion, it also adds supersonic energy to the analog output signal, which will interact differently with various types of line amplifiers and power amplifiers. Higher levels of dither generally improve DAC linearity, but also can stress electronics that have limited high frequency slewing capabili- ties.

  • Page 34: A/D Conversion Of Analog Tape Recordings

    Setup & Operation ® Model Two HDCD User’s Manual A/D Conversion of Analog Tape Recordings To obtain the very best possible quality when converting analog master tapes to digital masters using the Model Two, the following steps are recommended. 1. The outputs of the analog machine should be “hot rodded” directly to the analog inputs of the Model Two using minimum length runs of high quality cable, without going through a console or patch bay.

  • Page 35: Creating The 16-Bit Hdcd Release Sound You Want

    Setup & Operation ® Model Two HDCD User’s Manual Creating the 16-bit HDCD Release Sound You Want During HDCD 16-bit A/D conversion, or after HDCD 24-bit or 20-bit A/D conversion and 24- bit or 20-bit digital processing, the Model Two’s HDCD 16-bit amplitude encoding options, Peak Extension, HDCD Limiting, Low Level Extension, and HDCD 16-bit Dithers, are used to produce the best possible 16-bit HDCD encoded release masters from an analog or 24-bit or 20-bit source.

  • Page 36: Dsp Gain

    Setup & Operation ® Model Two HDCD User’s Manual DSP Gain From the Operating Menu select (LEVELS/DSPGAIN) DSP Gain is a digital gain control that adjusts the level of digital input sources over a +6 to -25.9 dB range (+12 to -19.9 dB with Peak Extension) and has extremely low distortion. DSP Gain allows 24-bit or 20-bit input sources to be “fit”...

  • Page 37: Hdcd 16-Bit Dithers

    Setup & Operation ® Model Two HDCD User’s Manual HDCD 16-bit Dithers From the Operating Menu select (SETUP/OUTPUT/OUT_1 or OUT_2/DITHER or MORE...). HDCD 16-bit dither options allow optimizing perceived timbral and spacial accuracy with different types of source material during HDCD 16-bit A/D conversion, or when converting 24-bit or 20-bit signals to HDCD 16-bit.

  • Page 38: Wide Dynamic Range Jazz Or Classical

    Setup & Operation ® Model Two HDCD User’s Manual that will almost always be in the limiting curve, unless a highly limited or distorted sound is desired during undecoded playback. Typically, Peak Extension recordings do not have the “crunch” or “edge” produced by hard clipping that is sometimes desired for certain types of rock material.

  • Page 39: Reference

    Reference ® Model Two HDCD User’s Manual Menu Structure The menu structure is shown in tree form on page 40. The top level menu is the Operating Menu. To get to the Operating Menu from any other menu, press and hold the Menu Up button.

  • Page 40: Menu Tree

    Legends: [ ] = Menu Name [ OPERATING ] Toggle Select Only in DD4X/2X to 1X Modes ¤ Deleted if 2X or 4X Sample Rate LEVELS SETUP MTRMODE MTRSRCE OPS 2 [ LEVELS ] [ SETUP ] OUT_1 [ SECOND NORMAL Only if 2X Sample Rate OUT_2...

  • Page 41: Menu Descriptions

    Reference ® Model Two HDCD User’s Manual Menu Descriptions The selections to access a menu or feature, starting from the Operating Menu, are shown in (parentheses). The menu descriptions shown are with the 44.1 kHz Base Sample Rate selected. If 48 kHz is selected, the menus remain the same, except multiples of 48 replace 44.1.

  • Page 42: Monitor Source Menu

    Reference ® Model Two HDCD User’s Manual Function Buttons 1 - 4 select HDCD 16-bit encode and monitor modes. Button #1 (PEAKEXT) selects if Peak Extension or HDCD Limiting are on or off, button #2 (LOWLVL) selects if normal Low Level Extension is on or off, button #3 (MONHD16) selects if HDCD 16-bit amplitude decoding during monitoring is on or off, and button #4 (SCALING) selects if Gain Scaling during monitoring is on or off.
  • Page 43 Reference ® Model Two HDCD User’s Manual In 44.1 kHz Digital Input mode (DD44-44): In 88.2 kHz A/D mode (AD_88.2): In 176.4 kHz A/D mode (AD176.4): Function button #1 selects STEREO, CH_1, or CH_2 control of either analog input level (AD_GAIN) in A/D modes, or digital signal level (DSPGAIN) in Digital Input modes.

  • Page 44: Setup Menu

    Reference ® Model Two HDCD User’s Manual to -78 dBu, selectable in 0.1 dB nominal steps (actual step resolution is 0.188 dB). For 88.2 and 176.4 kHz monitoring, the level range is +24 to -11.9 dBu in actual 0.1 dB steps. Function button #4 (MONHD16) when set to the OFF position allows listening to HDCD 16- bit signals through the D/A analog outputs without HDCD amplitude decoding.

  • Page 45: 44.1/48 Base Sample Rate Menu

    Reference ® Model Two HDCD User’s Manual Page two of the Setup Menu: Button #1 (SYSTEM) selects the System Menu, button #2 (MONITOR) selects the Monitor Setup Menu, button #3 (METER) selects the Meter Setup Menu, button #4 (STORE_P) se- lects the Store Presets Menu, and button #5 (MORE...) selects page three of the Setup Menu.

  • Page 46: Operating Mode 1_X Modes Menu

    Reference ® Model Two HDCD User’s Manual modes. When 44.1_X is selected, all operating modes in the Operating Mode Menus operate at 44.1 kHz or 2X (88.2 kHz) or 4X (176.4 kHz) multiples of 44.1 kHz. Button #3 (48_X) selects 48 kHz as the base sample rate for all Model Two operating modes. When 48_X is selected, all operating modes in the Operating Mode Menus operate at 48 kHz or 2X (96 kHz) or 4X (192 kHz) multiples of 48 kHz.

  • Page 47: Operating Mode 4_X Modes Menu

    Reference ® Model Two HDCD User’s Manual Operating Mode 4_X Modes Menu Button #1 (AD176.4) selects 176.4 kHz AD mode, button #2 (DD176.4) selects 176.4 kHz to 176.4 kHz DD mode, button #3 (D176-88) selects 176.4 kHz to 88.2 kHz DD mode, button #4 (D176-44) selects 176.4 kHz to 44.1 kHz DD mode, button #5 (MORE...) selects page two of the Operating Mode 4_X Modes Menu.

  • Page 48: Digital Output 1 Word Length Menu

    Reference ® Model Two HDCD User’s Manual Function button #1 (OUT_1) selects the Digital Output 1 Word Length Menu, button #2 (OUT_2 ) selects the Digital Output 2 Word Length Menu, button #3 (PHASINV) selects the Digital Output Phase Invert Menu, and button #4 (HDCD_16) selects the Digital Output HDCD Setup Menu.

  • Page 49: Output 1 Hdcd_16 Dither Menu

    Reference ® Model Two HDCD User’s Manual Function buttons 1-4 select different HDCD 16-bit dither types. #5 selects the second page of the Dither Menu. Pressing ENTER activates the selected dither type. Dither 1 is the default dither used in the factory setup presets and provides excellent resolution and accurate timbre with most source material.

  • Page 50: Output 2 Hdcd_16 Dither Menu

    Reference ® Model Two HDCD User’s Manual Output 2 HDCD_16 Dither Menu The Output 2 HDCD_16 Dither Menu is reached from the Operating Menu by selecting (SETUP/OUTPUT/OUT_2/DITHER). Function buttons 1-4 select HDCD dithers. #5 selects the second page of the Dither Menu. Pressing ENTER activates the selected dither.

  • Page 51: Digital Output Phase Invert Menu

    Reference ® Model Two HDCD User’s Manual Digital Output Phase Invert Menu The Digital Output Phase Invert Menu is reached from the Operating Menu by selecting (SETUP/OUTPUT/PHASINV). Function button #1 (NORMAL) selects normal phase, button #2 (INVERT) selects inverted absolute phase (both channels inverted), and function button #3 (L_INVRT) selects in- verted relative phase (left channel only inverted).

  • Page 52: Digital Output Format Menu

    Reference ® Model Two HDCD User’s Manual Digital Output Format Menu In 88.2 kHz (2_X) digital output operating modes, the Digital Output Format Menu is reached from the Operating Menu by selecting (SETUP/OUTPUT/FORMAT). Function button #1 (1_WIRE) selects single wire, double speed AES as the digital output format, button #3 (2_WIRE) selects two wire, single speed AES as the digital output format.

  • Page 53: A/D Reference Clock Menu

    Reference ® Model Two HDCD User’s Manual The A/D REF clock mode is displayed on the top right of the menu and is set using the Reference Clock Menu, selected by function button #1 (REFCLK). Button #2 (HDCDBIT) selects the Monitor Input HDCD Code Detect Menu, button #3 (MON_REF) selects the Monitor Reference Clock Menu, button #4 (REF_FRQ) selects the External Ref Clock Fre- quency Menu, button #5 (FORMAT) selects the Monitor Digital Input Format Menu.

  • Page 54: Monitor Input Hdcd Code Detect Menu

    Reference ® Model Two HDCD User’s Manual Function button #1 (NORMAL) selects normal HDCD dynamic decimation filtering. Function button #3 (FIXED_1) selects a fixed decimation filter. If an HDCD A/D converted 44.1 kHz or 48 kHz digital recording (20-bit, 24-bit, or 16-bit) is converted back to analog for analog processing and again converted to digital, the FIXED_1 filter should be used for the second A/D conversion.

  • Page 55: External Ref Clock Frequency Menu

    Reference ® Model Two HDCD User’s Manual Function button #1 (DIG_IN) selects the digital input data being monitored as the clock source, button #3 (A/D_REF) selects the clock source selected in the A/D Reference Clock Menu as the clock source. The Monitor Reference Clock Menu is used to select the D/A converter clock source when monitoring digital input signals while in AD operating modes.

  • Page 56: Digital Input Menu

    Reference ® Model Two HDCD User’s Manual format, button #3 (2_WIRE) selects two wire, single speed AES as the digital input format. Pressing ENTER activates the selection. Digital Input Menu In all DD operating modes, the Digital Input Menu is reached from the Operating Menu by selecting (SETUP/INPUT).

  • Page 57: Digital Input Hdcd_16 Decoding Menu

    Reference ® Model Two HDCD User’s Manual Operating Menu by selecting (SETUP/INPUT/HDCDBIT). Function buttons 1-3 select the digital input HDCD code detect word length. Pressing ENTER activates the selected word length. The Digital Input HDCD Code Detect Menu is used to set the word length of HDCD LSB code detection in the digital input signal.

  • Page 58: Digital In Reference Clock Menu

    Reference ® Model Two HDCD User’s Manual The 2X to 1X Filter Mode Menu provides the same decimation filter choices for 2X digital input signals as the A/D Filter Mode Menu described on page 53. Digital In Reference Clock Menu In all DD operating modes, the Digital In Reference Clock Menu is reached from the Operating Menu by selecting (SETUP/INPUT/REF_CLK).

  • Page 59: Recall Presets Menu

    Reference ® Model Two HDCD User’s Manual format, button #3 (2_WIRE) selects two wire, single speed AES as the digital input format. Pressing ENTER activates the selection. Recall Presets Menu The Recall Presets Menu is reached from the Operating Menu by selecting (SETUP/PRESETS).

  • Page 60: Front Panel Display Menu

    Reference ® Model Two HDCD User’s Manual Front Panel Display Menu The Front Panel Display Menu is reached from the Operating Menu by selecting (SETUP/MORE.../SYSTEM/PANEL). After pressing a function button, the Rotary Control is used to change the value of the selected item.

  • Page 61: Monitor Setup Menu

    Reference ® Model Two HDCD User’s Manual Function button #1 (1XOP) toggles between three levels of DAC dither for 44.1 kHz (1_X) signals. Button #3 toggles between four levels of DAC dither for 88.2/176.4 kHz (2_X/4_X) signals. Once set, values are not altered during the loading or saving of presets or during power down.

  • Page 62: Meter Overload Light #1 Menu

    Reference ® Model Two HDCD User’s Manual Function button #1 (PEAKHLD) toggles between four peak level hold settings. HOLD - holds peaks until cleared by the Meter Reset Button, LONG - peaks held for 4 seconds, SHORT - peaks held for 1.5 seconds, and NONE - peaks not held. Button #2 (OVRLD_1) selects the Meter Overload Light #1 Menu and button #3 (OVRLD_2) selects the Meter Overload Light #2 Menu.

  • Page 63: Store Presets Menu

    Reference ® Model Two HDCD User’s Manual The Meter Overload Light #2 Menu is the same as the Meter Overload Light #1 Menu except that the threshold range for light #2 is from 0 to 3 successive full scale data words greater than the setting for light #1.

  • Page 64: Rename Preset Menu

    Reference ® Model Two HDCD User’s Manual The Rotary Control is used to scroll through the available character set which includes letters, numbers, and symbols. Function buttons #1 and #2 move the active data entry point left and right through the data fields. The NAME field holds a maximum of 8 charac- ters, and the DESCRIPTION field holds a maximum of 28 characters.

  • Page 65: Software Version Menu

    Reference ® Model Two HDCD User’s Manual Software Version Menu The Software Version Menu is reached from the Operating Menu by selecting (SETUP/MORE.../MORE.../VERSION). There are no selections on this menu. It displays software version and hardware revision status information only. Please have this information available when contacting Pacific Microsonics Technical Support.

  • Page 66: Download Procedure

    Reference ® Model Two HDCD User’s Manual 3. An RS-232 null modem serial data communication cable, such as a Laplink cable (the correct cable is included with the Model Two). The Model Two has a DB-9 male connector which is configured as a computer (DTE), not a modem. Download Procedure 1) Set up the Windows communication program to send/receive at an appropriate baud rate.

  • Page 67: Self-Test

    Reference ® Model Two HDCD User’s Manual 6) Type random characters on the PC keyboard and verify that they appear on its screen. If the characters do not appear, check the setup. The problem may be with the Windows communication program or cable. Typing “GO” on the PC will continue the download procedure and will dump all current system software.

  • Page 68: Hdcd Overview

    Reference ® Model Two HDCD User’s Manual HDCD Overview ® ® The HDCD (High Definition Compatible Digital ) process utilizes a sophisticated encod- ing/decoding system that greatly reduces both additive and subtractive distortions in digital audio recordings, while remaining compatible with all PCM digital formats, includ- ing Compact Disc and DVD-Audio.

  • Page 69: Hdcd Indicator

    Reference ® Model Two HDCD User’s Manual resolution signal, which is then output in the correct form for the D/A converter being used. Decoding can be performed by the Pacific Microsonics PMD-200 HDCD decoder DSP ASIC, other ASIC’s including a one chip HDCD decoder and 24-bit D/A converter from Burr- Brown, and HDCD coded DSP based chips from Motorola, Analog Devices, Zoran, Mediamatics, Crystal Semiconductor and others.

  • Page 70: Low Level Extension

    Reference ® Model Two HDCD User’s Manual 41 and 51 for additional information. Low Level Extension Low Level Extension is an average signal level based, low level compression/expansion system used on HDCD 16-bit amplitude encoded recordings which very gradually raises gain a preset amount when the average signal level drops below a preset threshold.

  • Page 71: Technical Specifications

    Reference ® Model Two HDCD User’s Manual Technical Specifications Analog Inputs 1 and 2 Connectors: XLR-3-31; Polarity: pin 2 or 3 high (software selected); Sensitivity: +12 dBu to +24 dBu full scale; Impedance: 13 k balanced; CMRR: > 80 dB DC to 1 kHz, > 60 dB at 20 kHz.
  • Page 72 Reference ® Model Two HDCD User’s Manual User Set-Up and Operating Interface A backlit, dot matrix graphic display, rotary optical encoder, and soft-configured switches allow multimode, multilevel, software based configuration of all setup and operating pa- rameters. Multiple setup configurations may be loaded into user labeled presets for in- stant access.

  • Page 73: Appendix

    Reference ® Model Two HDCD User’s Manual Appendix Setting Up Communications on a PC Using Windows 3.11 Start Windows and open up the Accessories Program Manager Box, by double clicking on the Accessories Icon. Double click on the Terminal Icon. Using the communications program’s pull down menu, select “Settings”.
  • Page 74 Reference ® Model Two HDCD User’s Manual will open. Make sure that the “Echo typed characters locally” box is not checked. Click on “OK” to accept these ASCII settings, then click “OK” again to accept the ‘configuration file name’ properties. The Windows HyperTerminal program is now in terminal mode with a direct connection to Com 1.

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