Model Two ® HDCD A/D Converter D/A Converter Digital Processor User’s Manual Version 3.01 PN 9300-0020 Rev. C ® Euphonix, Inc.
Overview Model Two HDCD® User’s Manual 2 This User’s Manual contains information needed to properly install and operate the Model Two. Please read the Installation section before connecting AC power! The Installation and Set Up & Operation sections of this manual should also be read before first use of the Model Two. Model Two User’s Manual Versions correspond to Model Two Software Versions.
Table of Contents HDCD 16-bit Dithers, 37 Operating Techniques, 37 Limited Dynamic Range Pop or Rock, 37 Wide Dynamic Range Jazz or classical, 38 Installation Model Two Processor, 4 Model Two Power Supply, 4 DC Power Cable, 4 AC Power Cable, 4 Power Up, 5 Setting Analog Connector Pin Polarity, 5 Setting Analog Input Attenuation, 6 Analog Connections, 7 Analog Output Networks, 7 Digital Connections, 7 AES Signal Ground Isolators, 8 Model Two Processor Description, 9 Model Two Processor Front Panel Controls
Installation Model Two HDCD® User’s Manual 4 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. A vibration isolated fan stabilizes the Processor’s thermal environment.
Installation Model Two HDCD® User’s Manual 5 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. Power Up Press the Power Switch on the Processor front panel to turn on the Processor and Power Supply.
Installation Model Two HDCD® User’s Manual 6 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.).
Installation Model Two HDCD® User’s Manual 7 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 kΩ balanced (≥ 6.5 kΩ per leg); output impedance is 20 Ω balanced (10 Ω per leg). If the audio source driving the Model Two is single ended, a balanced interconnect cable should be used with the return wire tied to ground at the sending end.
Installation Model Two HDCD® User’s Manual 8 For best performance, AES3 cables should have the chassis ground path isolated by a series 100 Ω 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 outputs is also recommended. Cables sending AES3 or synchronization signals from the Model Two to other equipment should have transformer isolation placed at the inputs of the receiving equipment.
Installation 9 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 Processor (DSP), Digital to Analog Converter (DAC), and Front Panel Controller (FPC).
Installation 10 Model Two HDCD® User’s Manual Processor rear panel I/O connections and Analog Input Attenuator.
Installation Model Two HDCD® User’s Manual 11 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.
Setup & Operation Model Two HDCD® User’s Manual 12 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. The Model Two can also generate or lock to either 1X or 2X reference clock frequencies in both AD and DD modes.
Setup & Operation 13 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: 7 6 8 9 10 11 12 P A C I F I C MICROSONICS METER RESET CLOCK A/D D/A SYSTEM ENTER POWER UP DOWN MENU 1 1 2 3 4 5 6 3 2 “POWER” Switch “MENU” “UP” and “DOWN” Buttons Function Buttons 1-5 (left to right) “ENTER” Button Rotary Control “SYSTEM” Status Indicator 4 7 8 9 10 11 12 5 “CLOCK” Indicators “
Setup & Operation Model Two HDCD® User’s Manual 14 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). 88.
Setup & Operation Model Two HDCD® User’s Manual 15 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. The threshold for over segment #2 can be set for 0 to 3 consecutive over samples beyond the segment #1 setting.
Setup & Operation Model Two HDCD® User’s Manual 16 Monitoring In all Operating Modes, digital signal monitoring is available at the analog outputs. Monitor function setup choices are shown below. For more information see the Menu Descriptions in the Reference section, page 40.
Setup & Operation Model Two HDCD® User’s Manual 17 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. Display contrast and brightness are adjustable using the Front Panel Display Menu. From the Operating Menu select (SETUP/ MORE.../SYSTEM/PANEL).
Setup & Operation Model Two HDCD® User’s Manual 18 System Status Indicator The System Status Indicator is a multi-color LED which shows system status. States displayed by the Indicator are shown below: Off = System Off Green = System Status Normal Orange = Non Standard Operation Red = Non Fatal Error Flashing Red = Fatal Error The most common causes of system errors involve system synchronization which will also extinguish one or more of the clock indicators.
Setup & Operation Model Two HDCD® User’s Manual 19 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. NOTE: The Operating Modes listed below and described on the following pages appear in the Operating Mode Menus if the 44.1_X base sample rate is selected.
Setup & Operation Model Two HDCD® User’s Manual 20 NOTE: HDCD LSB code must be reinserted when producing HDCD Compact Disc or DVDAudio 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.
Setup & Operation Model Two HDCD® User’s Manual 21 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. Selectable, two-wire, standard speed, or single wire, double speed AES signal formats are used for the 88.
Setup & Operation Model Two HDCD® User’s Manual 22 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. Digital output 1 is channel 1, and digital output 2 is channel 2. 0 to +3.15 dB of digital A/D gain adjustment in .05 dB steps is available using AD gain in the Levels Menu (LEVELS/AD_GAIN). Factory Preset: AD4X-24. DD176.4 Mode In DD176.
Setup & Operation Model Two HDCD® User’s Manual 23 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, standard 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). When two wire is selected, digital input 1 is channel 1, and digital input 2 is channel 2. The 176.
Setup & Operation Model Two HDCD® User’s Manual 24 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 Recall Store/Rename/Erase Menu Location Recall Presets(SETUP/PRESETS) Store Presets(SETUP/MORE...
Setup & Operation Model Two HDCD® User’s Manual 25 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 AD1X-16* AD1X2416+ AD+DD1X DD1X-20* DD1X-16+ AD2X-24 DD1X-2X* DD1X-4X** DD2X-2X+ DD2X-4X++ AD4X-24^ DD4X-4X^^ DD4X-2X~ DD2X-24 DD2X-16* DD4X-24+ DD4X-16^ Menu/FUNCTION: ___________________ VALUES:_______________________ Operating Mode AD_44.
Setup & Operation Model Two HDCD® User’s Manual 26 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.
Setup & Operation Model Two HDCD® User’s Manual 27 For AD Operating Modes Multichannel “Slave”: 1. From the Operating Menu, select the desired Base Sample Rate (SETUP/MODE/44.1_X or 48_X) and Preset Configuration (SETUP/PRESETS). 2. From the Operating Menu, select (SETUP/INPUT/REFCLK/REFWCLK). 3. From the Operating Menu, select (SETUP/INPUT/MON_REF/A/D_REF). For DD Operating Modes Multichannel “Slave”: 1. From the Operating Menu, select the desired Base Sample Rate (SETUP/MODE/44.
Setup & Operation Model Two HDCD® User’s Manual 28 For 44.1 kHz or 48 kHz A/D conversion: 1. Connect an analog signal source to the channel 1 and 2 analog inputs. 2. From the Operating Menu, select (SETUP/MODE/44.1_X or 48_X) 3. Connect AES Out 1 or 2 to the AES input of a 44.1/48 kHz digital audio recorder. 4. Connect the AES output of the digital audio recorder to AES In 1. 5.
Setup & Operation Model Two HDCD® User’s Manual 29 For 176.4 kHz or 192 kHz A/D conversion: 1. Connect an analog signal source to the channel 1 and 2 analog inputs. 2. From the Operating Menu, select (SETUP/MODE/44.1_X or 48_X) 3. 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. 4. Connect the double speed AES 1 and 2 output of the digital audio recorder or DAW to AES In 1 and 2. 5.
Setup & Operation Model Two HDCD® User’s Manual 30 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. HDCD_16 is selected by preset AD+DD1X.
Setup & Operation Model Two HDCD® User’s Manual 31 digital signals to HDCD 24, 20 or 16-bit, 44.1/48 kHz signals using HDCD decimation. 1. 2. 3. 4. 5. 6. 7. From the Operating Menu, select (SETUP/MODE/44.1_X or 48_X). From the Operating Menu, select (SETUP/PRESETS) and select either preset DD2X24 or DD2X-16, depending on the desired output word length. Or, from the Operating Menu, select (SETUP/MODE/MORE.../MORE.../DD88-44 or DD96-48).
Setup & Operation Model Two HDCD® User’s Manual 32 Once the Model Two is set up for 44.1/48 kHz to 88.2/96 kHz interpolation, other parameters 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.
Setup & Operation Model Two HDCD® User’s Manual 33 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 capabilities.
Setup & Operation Model Two HDCD® User’s Manual 34 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.
Setup & Operation Model Two HDCD® User’s Manual 35 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 24bit 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.
Setup & Operation Model Two HDCD® User’s Manual 36 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” optimally into the more limited dynamic range of a 16-bit release format by setting peak levels as close as possible to 0 dBfs.
Setup & Operation Model Two HDCD® User’s Manual 37 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. The dither options are: DITHER1, DITHER2, DITHER3, DITHER0, ROCK_1, ROCK_2, and ROCK_3.
Setup & Operation Model Two HDCD® User’s Manual 38 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. To get a hard “crunch” without any “easy over” limiting, turn Peak Extend off and adjust DSPGAIN to a level just below full scale, usually - 0.1 dB.
Reference Model Two HDCD® User’s Manual 39 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. The active modes of the function buttons are labeled above them on the graphic display. For example, from the Operating Menu, pressing the function button labeled OPS 2 will call up the Second Operating Menu. Some menus display the option MORE...
° °° ° MTRMODE NORMAL FINE BITS °° ° PEAKEXT OFF LIMIT ON *+°°° ° °° MTRSRCE OUT_1 OUT_2 DIGIN_2 DIG_IN °° LOWLVL OFF NORMAL LEVELS [ LEVELS ] OPS 2 [ SECOND OPERATING ] °° MONHD16 ON OFF SCALING ON OFF (IF AD MODE) AD_GAIN (IF DD MODE) DSPGAIN °° ° * OUT_2 DIG_IN OUT_1 FOLWMTR SOURCE [ MONITOR SOURCE ] * ◊ OUT1OFS STEREO STEREO CH_1 CH_2 MONHD16 MONLVL °°° °° STEREO CH_1 CH_2 ON OFF Reference P A C I F I C Legends: [ ] = Menu Name = Toggle Select ¤ = Only in DD4X/2X to 1X Mo
Reference Model Two HDCD® User’s Manual 41 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. The menu descriptions follow the order of the Menu Tree on page 40. Operating Menu The Operating Menu is the top level menu. All other menus are reached from this menu.
Reference Model Two HDCD® User’s Manual 42 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. Button # 5 (SOURCE) selects the Monitor Source Menu.
Reference Model Two HDCD® User’s Manual 43 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. AD_GAIN adjusts the analog input signal level in the digital domain. Raising A/D gain 1 dB is equivalent to raising the analog input level 1 dB. The A/D gain range is from 0 dB to + 3.
Reference Model Two HDCD® User’s Manual 44 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 16bit signals through the D/A analog outputs without HDCD amplitude decoding. For more information on operation of the MONHD16 control see the Monitor Setup Menu on page 61.
Reference Model Two HDCD® User’s Manual 45 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) selects the Store Presets Menu, and button #5 (MORE...) selects page three of the Setup Menu. Descriptions of the above menus begin on pages 59, 61 and 63. Page three of the Setup Menu: Button #1 (DOWNLD) activates the system software download procedure.
Reference Model Two HDCD® User’s Manual 46 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.
Reference Model Two HDCD® User’s Manual 47 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. Pressing ENTER activates the selection. Page two of the Operating Mode 4_X Modes Menu: Button #1 (D88-176) selects 88.2 kHz to 176.
Reference Model Two HDCD® User’s Manual 48 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. Descriptions of these menus are on pages 48 to 51. In 88.2 kHz (2_X) digital output operating modes: In 88.
Reference Model Two HDCD® User’s Manual 49 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. Dither 2 provides a slightly different sonic “flavor” that may be preferred with some sources.
Reference Model Two HDCD® User’s Manual 50 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. The dithers are the same as those in the Output 1 HDCD_16 Dither Menu. The Output 2 HDCD_16 Dither Menu is deleted when FOLW_1 is selected in the Digital Output 2 Word Length Menu.
Reference Model Two HDCD® User’s Manual 51 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 inverted relative phase (left channel only inverted). Pressing ENTER activates the selected mode.
Reference Model Two HDCD® User’s Manual 52 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. Pressing ENTER activates the selection.
Reference Model Two HDCD® User’s Manual 53 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 Frequency Menu, button #5 (FORMAT) selects the Monitor Digital Input Format Menu.
Reference Model Two HDCD® User’s Manual 54 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. Function button #5 (FIXED_2) selects another type of fixed decimation filter.
Reference Model Two HDCD® User’s Manual 55 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. See page 26 for details.
Reference Model Two HDCD® User’s Manual 56 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). This menu appears in different forms depending on whether 1_X, 2_X or 4_X digital input DD operating modes are selected. In 44.
Reference Model Two HDCD® User’s Manual 57 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. Even if the input signal is HDCD, HDCD code will not be detected if the Code Detect setting is different from the word length of the input signal.
Reference Model Two HDCD® User’s Manual 58 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).
Reference Model Two HDCD® User’s Manual 59 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). The Rotary Control is used to scroll through the stored presets. A brief description of the highlighted preset is displayed on the menu. For example, the description for the AD1X-24 preset is “FIXED: ANALOG to 1X HDCD24“.
Reference Model Two HDCD® User’s Manual 60 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.
Reference Model Two HDCD® User’s Manual 61 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. See further description on page 32. Monitor Setup Menu The Monitor Setup Menu is reached from the Operating Menu by selecting (SETUP/MORE.../MONITOR).
Reference Model Two HDCD® User’s Manual 62 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. Button #4 (FINEREF) enables the Rotary Control to change the fine reference level setting.
Reference Model Two HDCD® User’s Manual 63 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. For example, if the threshold of light #1 is set to 1, light #2 can be set to a threshold of 1 to 4. If light #1 is set to 2, light #2 can be set to 2 to 5, and so on.
Reference Model Two HDCD® User’s Manual 64 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 characters, and the DESCRIPTION field holds a maximum of 28 characters. Pressing button #3 (DONE) displays the following message “Accept these changes? Press ENTER to confirm, or any other key to cancel”.
Reference Model Two HDCD® User’s Manual 65 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.
Reference Model Two HDCD® User’s Manual 66 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. Load the new Model Two software from the floppy onto the PC.
Reference Model Two HDCD® User’s Manual 67 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. DO NOT TYPE “GO” UNLESS YOU ABSOLUTELY WANT TO DOWNLOAD A NEW VERSION OF SYSTEM SOFTWARE. Press CANCEL to abort the download process.
Reference Model Two HDCD® User’s Manual 68 HDCD Overview The HDCD® (High Definition Compatible Digital®) process utilizes a sophisticated encoding/decoding system that greatly reduces both additive and subtractive distortions in digital audio recordings, while remaining compatible with all PCM digital formats, including Compact Disc and DVD-Audio.
Reference Model Two HDCD® User’s Manual 69 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 BurrBrown, and HDCD coded DSP based chips from Motorola, Analog Devices, Zoran, Mediamatics, Crystal Semiconductor and others.
Reference Model Two HDCD® User’s Manual 70 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.
Reference Model Two HDCD® User’s Manual 71 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 kΩ balanced; CMRR: > 80 dB DC to 1 kHz, > 60 dB at 20 kHz. Analog Outputs 1 and 2 Connectors: XLR-3-32; Polarity: pin 2 or 3 high (software selected); Level: +18 or +24 dBu full scale, set with analog attenuator. All other levels are set by digital attenuation in 0.188 dB steps at 44.
Reference Model Two HDCD® User’s Manual 72 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 parameters. Multiple setup configurations may be loaded into user labeled presets for instant access. Signal Level Meters Two channel, 66 dB range, four color LED bar graph.
Reference Model Two HDCD® User’s Manual 73 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”.
Reference Model Two HDCD® User’s Manual 74 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. Beginning File Transfer from the PC Using the Windows communications program pull down menu, select “Transfer”, then “Send Text File”.
