General Features:
The Micro-CAM provides a USB digital and analog audio interface between an Operator Position PC and several peripherals that attach to an Ultra-Com IP Software Remote Operator Position PC. It is intended as a lower cost alternative to Moducom’s traditional Computer Audio Module (CAM) based operator position.
Software Remote Operator Position Description
A Software Remote operator position provides almost all of the functionality of a conventional Ultra-Com IP operator position without requiring a CAM box and a dedicated T1 connection to the MEP. In this configuration, a standard Windows PC running the Ultra-Com IP Run Mode Operator Position software connects to a local (or remote) MEP via an IP network. There is no CAM connected to the PC. The Operator Position software routes the position’s Select and Unselect audio to standard multimedia speakers connected to the PC. The operator uses a microphone connected to the PC sound card for transmit audio. The operator interacts with the Operator Screens using a mouse, optional touch screen and the keyboard. While this configuration is less costly than a full CAM-based operator position and can be located anywhere there is access to the Moducom IP network, it does have several limitations. The most serious limitations are the lack of a standard desk microphone, headset jack and footswitch connections. The Micro-CAM is a low cost USB accessory that restores the use of these peripherals when using a Software Remote operator position
Micro Computer Audio Module (Micro-CAM) Description
The Micro-CAM provides a USB interface between the PC and several peripherals attached to a Software Remote operator position. The Micro-CAM is typically mounted in a small enclosure that includes a dual-prong headset jack connector. It can also be housed in an integrated case that contains a small touch screen tablet computer, select and unselect speakers, headset jack and assorted peripheral connectors. Power is provided through a small 12V switching power supply or by tapping into the 19V (typical.) power source used by a cohabitated small touch screen tablet computer.
Micro-Cam/Remote Positions Features:
- Provide an USB interface port to the PC. This is used to pass all commands and data packets between the Ultra-Com IP Run Mode software and the Micro-CAM. If the optional SDRAM is provided, the Ultra-Com IP Run Mode software has the ability to download updated Micro-CAM running software via the USB port during initialization.
- Monitor the Transmit PTT, handset and headset detect lines for a change of state. Depending on the operation, some changes of states will be reported to the Ultra-Com Run Mode software. Other changes of state may result in the local software altering analog audio routing paths.
- Perform local diagnostics. On power-up the card performs testing of the following circuitry: processor internal memory, Boot EPROM checksum and USB interface.
- Provide a routable input for dynamic, headset and handset microphone audio.
- Condition microphone audio from headset, handset or dynamic microphone. This function requires monitoring the microphone audio and dynamically controlling the input gain of the microphone. This function is termed audio level compression and is performed by an analog compression amplifier circuit. The resulting transmit audio is routed to the PC sound card input.
- Drive up to two speaker outputs at a maximum of 3 watts each. The audio for these amplifiers originates from the PC sound card output.
- Drive one local two-prong headset jack and optionally one external headset jack only box. This provides radio and telephone headset audio for use with standard dispatcher headsets.
- Interface receive (Select/Telephone and Unselect) audio and transmit (microphone) audio from the PC’s sound card.
- Control the analog routing of Operator Position headset and speaker audio.
- An Analog Devices ADSP-BF532 Blackfin processor. The processor contains 48KB of instruction and 32KB of data RAM. The processor performs the following functions on the Micro-CAM: headset , PTT and left footswitch detection and reporting, desk and headset microphone audio routing, headset and Select speaker audio routing. The processor runs at up to a 400MHz instruction rate internally (software programmable). Note a ADSP-BF533 Blackfin processor may be substituted for this part as it is currently stocked for the EBC-PIC card.
- A 128KB (512KB maximum) write-disabled socketed Boot FLASH memory, which contains the boot and operating code for this card. The write line may be enabled with a jumper for in-circuit programming.
- OPTIONAL: A 16MB (8M x 16-bit device) of 120MHz or 133MHz PC133 SDRAM memory for data/code space.
- A National Semiconductor USB9603 USB interface IC. This provides the low-level interface between the processor and the USB port.
- A 24MHz clock oscillator, which supplies the USB controller and CPU clock signals.
- A TI TPA3002D2 dual 3-watt speaker amplifier. This drives the Select and Unselect speaker outputs.
- Analog circuitry for conditioning and routing audio. Audio inputs include desk microphone, a headset microphone input (OPTIONAL second headset input), a handset audio input and 2-channel sound card audio (Select speaker/phone RX and Unselect speaker audio). An analog compressor circuit is included for microphone audio. Analog outputs include sound card output (microphone audio), Select speaker, Unselect speaker, a headset ear output (OPTIONAL second headset ear output), a handset ear output and a logging recorder output.
- A miniature SPST relay for a Phone Record Start signal.
- Protection circuitry for the PTT, handset and headset jack detect input lines.
- A Maxim MAX5072 Power supply regulator to provide +3.3V, and +12V power. These power sources are used to power the digital and analog circuitry, respectively. The power input to the board will vary from 14V to 23V. When this board is integrated with a small touch screen tablet computer, the power input will be supplied by tapping into the 14V-23V power source (19V typical) used by the computer.
- A reset circuit to provide a power-up reset. This circuit automatically resets the CPU if the +3.3 volt power falls below 3.05 volts. This function is provided by the Maxim MAX5072 power regulator.
- Status LED’s for Fault, USB TX/RX status, Transmit status, and Power (+12, +3.3).
The Computer Audio Module has the following connectors.
- J1 USB. -- This connector supplies digital audio and data between the Micro-CAM and the PC (4-pin USB Type B square connector, Right angle or Straight mount)
Pin Function .
1. Not Used (+5V USB Power)
2. Data +
3. Data -
4. Return
- J Multifunction ( 15-pin female D-sub)
Pin Function .
1. Dynamic Desk Microphone input +
2. Dynamic Desk Microphone input +
3. Dynamic Desk Microphone Shield Return
4. Foot Switch/PTT Logic Input (active Low)
5. Logic Return
6. Select/Xmit Record Audio Out +
7. Select/Xmit Record Audio Out -
8. Phone Record Start
9. Phone Record Start
10. PC Sound Card Input - L
11. PC Sound Card Input - R
12. PC Sound Card Input - Return
13. PC Sound Card Output - L
14. PC Sound Card Output - R
15. PC Sound Card Output - Return
- OPTIONAL - J Headset Jack-Only Box #2 -- Connects to an External Headset Jack-Only Box. ( 9-pin female D-sub)
Pin Function .
1. N/A
2. Analog Return
3. Radio Headset Audio Out
4. Headset Mic Audio Input (powered)
5. Headset Jack Detect Logic Input (active High)
6. PTT Logic Input (active Low)
7. +12V
8. N/A
9. Logic Return
- J Select/Unselect Speakers - Connect to the Select and Unselect speakers. (9-pin female D-sub)
Pin Function .
6. Select Speaker Output +
7. Select Speaker Output -
8. Unselect Speaker Output +
9. Unselect Speaker Output -
The Micro-CAM also has the following connectors, which are internal to the board.
- JI1 Int. Dynamic Microphone - Connect to optional internal Dynamic microphone. (3-pin 0.1” header)
Pin Function .
1. Dynamic Microphone input +
2. Dynamic Microphone input +
3. Dynamic Microphone Shield Return
- JI2 Int. PTT – Connect to optional internal PTT switch. (2-pin 0.1” header)
Pin Function .
2. PTT Logic Input (active Low)
3. Logic Return
- JI5 Power - Connects to the +12V to +24V power supply (2-pin Molex 0.156” header)
Pin Function .
1. +12V to +24V Power Input
2. Power Return
- J Headset Jack-Only #1 -- Connects to the internal Headset Jack. ( 9-pin female D-sub)
1. N/A
2. Analog Return
3. Radio Headset Audio Out
4. Headset Mic Audio Input (powered)
5. Headset Jack Detect Logic Input (active High)
6. PTT Logic Input (active Low)
7. +12V
8. N/A
9. Logic Return
- J PC Sound Card input (3-pin 0.1” header)
1. PC Sound Card Input - L
2. PC Sound Card Input - R
3. PC Sound Card Input - Return
- J PC Sound Card Output (3-pin 0.1” header)
1. PC Sound Card Output - L
2. PC Sound Card Output - R
3. PC Sound Card Output - Return
- J Handset Jack -- Connects to the internal Handset Jack. ( 6-pin 0.1” dual row header)
1. Analog Return
2. Handset Audio Out
3. Analog Return
4. Handset Mic Audio Input (bias powered)
5. Handset hook switch Logic Input (active Low)
6. Logic Return
- J 12V Fan Power -- Connects to an optional 12V cooling fan. ( 2-pin 0.1” header)
- J Blackfin ICE Header -- Connects an Analog Devices ICE. ( 14-pin 0.1” dual row header, with key)
Dip switch functions
1. Enable internal headset PTT
2. Flash Memory Write Enable
3. Dynamic microphone gain 1 (+6 dB, -48 dBm base)
4. Dynamic microphone gain 2 (+12 dB)
1. Headset microphone gain 1 (+6 dB, -8 dBm base)
2. Headset microphone gain 2 (+12 dB)
3. Handset microphone gain 1 (+6 dB, -8 dBm base)
4. Handset microphone gain 2 (+12 dB)
