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AMC DSP 88 User Manual

Digital signal processor
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Summary of Contents for AMC DSP 88

  • Page 2: Important Safety Instructions

    IMPORTANT SAFETY INSTRUCTIONS When using this electronic device, basic precautions should always be taken, including the following: 1. Read all instructions before using the product. 2. Do not use this product near water (e.g., near a bathtub, washbowl, kitchen sink, in a wet basement or near a swimming pool etc).

  • Page 3: Table Of Contents

    CONTENTS: Before you start Introductions Features Operation Front panel Rear panel Function description Powering up the device Operating the channel menus Operating the system menus Quick Reference PC Control Software Firmware upgrade Specifications General specifications...

  • Page 4: Introductions

    The DSP 88 can be controlled or configured in real time on the front panel or with the intuitive AMC DSP Software Control accessed via the RS-232, USB or Ethernet interface. Software upgrade for CPU and DSP via PC keeps the device current with newly developed algorithms and functions once available.

  • Page 5: Front Panel

    Front Panel 1. USB connector 5. Channel menu LED 2. RS232 connector 6. LCD display 3. Mute (channel button) 7. Menu buttons 4. Audio signal meter 8. Rotary selector Rear Panel 1. Power connector with power switch and AC 3. Balanced universal Phoenix outputs fuse (T2,5AL 250V) 4.

  • Page 6: Function Description

    Functions description This is a standard Type B USB connector. Device driver from the provided software CD must be installed prior to usage. RS232 This is a standard female DB \9 socket. A straight through cable is required for PC connection. Mute (Channel Menu) Buttons This button is for mute or un-mute input and output channel.

  • Page 7: Powering Up The Device

    Main Power Connects via a standard IEC socket. A compatible power cord is supplied with the unit. Main Fuse T2.5A-250V. Slow blow type. Power switch Controls power On/Off. Ethernet This is RJ45 connector for Ethernet control. The device should be connected to a router/switch/hub via a straight through CAT-5 cable.

  • Page 8: Operating The Channel Menus

    Operating the channel menus Please hold the Menu >> button and then, press the mute button of the input or output channels if you want to activate the channel menu. Channel Linking – while holding down the <<Menu or Menu>>, more than 1 channel from the same group (Input or Output group) can be selected to link the channels together.
  • Page 9 Input / output equalizer EQ#: Each input channel has 8 bands of equalization. This control selects one of the 8 available bands. BYPASS: This control will un-bypass (Off) or bypass (On) the currently selected band. TYPE: The 5 types of EQ that can be used are: parametric (PEQ), low shelf (LOSHF), high shelf (HI-SHF), 1st degree all-pass (AP-1), and 2nd degree all pass (AP-2).
  • Page 10 Input graphic equalizer GEQ#: The graphic equalizer has 31 bands of equalization from 20Hz to 20kHz. This control selects one of the 31 available bands. The frequency corresponding to each band is also shown. LEVEL: The GEQ level (or gain) ranges from -30.00dB to +15.00dB in 0.25dB steps. BYPASS: This control un-bypass (Off) or bypass (On) the entire GEQ for this channel.
  • Page 11 TYPH: The 3 available filter types for the high frequency crossover point (low pass) are: Butterworth, Linkwitz Riley or Bessel. The filter cut-off frequency for the high frequency crossover point (low pass) ranges from 20 to FRQH: 30kHz in either 1Hz steps or 1/36 octave steps. The frequency steps can be selected in the system menu.
  • Page 12 Input compressor THRESH: The compressor threshold ranges from -20 to +20dBu in 0.5dB steps. ATTACK: The compressor attack’s time ranges from 0.3 to 1ms in 0.1ms steps, then ranges from 1 to 100ms in 1ms steps. RELEASE: The compressor release’s time can be set at 2X, 4X, 8X, 16X or 32X the attack time. RATIO: The compressor ratio is the slope in which the signal is compressed.

  • Page 13: Operating The System Menus

    Preset recall The DSP 88 has a built in non-volatile memory that can store up to 30 different preset setups. This control selects which program to recall from the non-volatile memory. The program name is displayed to the right of the program no.
  • Page 14 Preset store The DSP 88 has a built in non-volatile memory that can store up to 30 different preset setups. A program can be stored using this menu. The old program with the same program number will be replaced. Once the program is stored in the flash memory, it can be recalled at a later time, even after power down.
  • Page 15 SOURCE: This is the channel to be copied from. TARGET: This is the channel to be copied to. General Settings FREQ MODE: This changes the frequency control mode for EQ and crossover filters. It can be 36 steps/octave or All Frequencies (1 Hz resolution). DELAY UNIT: This sets the time unit for input and output delay to ms, ft, or m.
  • Page 16 1 unit is used in conjunction with 1 or more DSP 88. BAUD RATE: It sets the baud rate of the serial communication. AMC DSP Software Control uses a baud rate of 115200, it should be left unchanged for most users.
  • Page 17 Factory settings CURRENT: This resets all the current parameters back to factory default settings only, while stored presets and system settings stay untouched. ISO settings (noise gate) This internal system optimizer (gate) reduces ground floor noise if no signal is present. If unwanted noise gate effects are audible on low sound levels it can be switched to bypass mode.

  • Page 18: Quick Reference

    The third and last screen display the security code. When no password is set the factory default code is 11110000. When another combination of characters is displayed a password is set in the device and certain functions are disabled for the user to modify. Quick reference...

  • Page 19: Pc Control Software

    USB requires the installation of additional driver. The user is given an option to install it during the installation of AMC DSP Software Control, and if the user did not install it at that time, they may choose to do so by running the USB driver installer from the provided software.
  • Page 20 A DOS prompt window will appear. Type “ipconfig” when ready and press enter. This brings up all the information required to setup the Ethernet connection. Return to the main page of the AMC DSP Software Control and click “Device 1 (online)”. The main window for that specific device appears.
  • Page 21 In the top left corner of this window, click on the “Device” button that is founded next to “Presets”. This initializes the configuration menu of the network card found in the rear of the DSP 88 unit. Within this dialogue menu, enter the information received from the previous DOS prompt instruction into the respective boxes.
  • Page 22 Before restarting AMC DSP Software Control, please disconnect the USB cable between PC and device and connect the DSP 88 to your router with a straight CAT-5 Ethernet cable. Please restart AMC DSP Software Control and make a connection to the device over Ethernet in the same manner as connecting via USB.

  • Page 23: Firmware Upgrade

    You should now see that “Device 1” is again online, but is communicating with the PC over a solid Ethernet connection. If you have AMC DSP Software Control installed on a notebook with WIFI capabilities, it is possible to connect the DSP 88 to a wireless router and connect without providing a hard-wired connection. Firmware upgrade Please note: It is not possible to do Firmware updates over the Ethernet connection, only via Serial Port or USB.
  • Page 24 Browse to the location and select the required .img or image file. In the bottom right corner of the main screen a progress bar will appear. When the upload is finished, you be prompted to switch the unit OFF and then ON again. This is necessary so that the device’s EPROM can be reprogrammed with the new Firmware.

  • Page 25: General Specifications

    General specifications Inputs and outputs Input impedance: >10k Ohms Output impedance: 50 Ohms Maximum level: +20dBu Inputs type: Electronically balanced Audio performance Frequency response: +/- 0.1dB (20 to 30kHz) Dynamic range: 115dB typ (unweighted) Crosstalk: < -100dB Distortion: 0.002% (1kHz @+4dBu) Digital audio performance Processor: 40-bit...
  • Page 26 Crossover filters 2 per I/O Filter types: Butterworth, Bessel, Linkwitz Riley Slopes: 6 to 48dB/oct Limiters 1 per Output Threshold: -20 to +20dBu Attack: 0.3 to 100ms Release: 2 to 32X the attack time System parameters No. of presets: Program names: 12 character length Delay units: ms, ft, m...
  • Page 27 NOTES: ___________________________________________________________________________________________ ___________________________________________________________________________________________ ___________________________________________________________________________________________ ___________________________________________________________________________________________ ___________________________________________________________________________________________ ___________________________________________________________________________________________ ___________________________________________________________________________________________ ___________________________________________________________________________________________ ___________________________________________________________________________________________ ___________________________________________________________________________________________ ___________________________________________________________________________________________ ___________________________________________________________________________________________ ___________________________________________________________________________________________ ___________________________________________________________________________________________ ___________________________________________________________________________________________ ___________________________________________________________________________________________ ___________________________________________________________________________________________ ___________________________________________________________________________________________ ___________________________________________________________________________________________ ___________________________________________________________________________________________ ___________________________________________________________________________________________ ___________________________________________________________________________________________ ___________________________________________________________________________________________ ___________________________________________________________________________________________ ___________________________________________________________________________________________ ___________________________________________________________________________________________ ___________________________________________________________________________________________ ___________________________________________________________________________________________ ___________________________________________________________________________________________ ___________________________________________________________________________________________ ___________________________________________________________________________________________ ___________________________________________________________________________________________ ___________________________________________________________________________________________ ___________________________________________________________________________________________ ___________________________________________________________________________________________ ___________________________________________________________________________________________ ___________________________________________________________________________________________ ___________________________________________________________________________________________ ___________________________________________________________________________________________ ___________________________________________________________________________________________ ___________________________________________________________________________________________ ___________________________________________________________________________________________...
  • Page 28 AMC is a registered trademark of AMC Baltic www.amcpro.eu...

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