Loading the MMD-USB with audio messages can be done locally into non-
volatile memory, using the integrated Microphone or line input, or can be
recorded in a studio and downloaded over the High Speed USB port.
The space saving built-in 4 watt power amplifier is perfect for most direct to
speaker applications as it eliminates the need for additional hardware.
The Minimac2 small size, industrial construction and the absence of moving
parts make it ideal for automatic unattended operation, especially in harsh
environmental or mobile conditions.
1.2 General Specifications
Audio Coding:
Recording:
WAV (44.1kHz, mono)
Playback:
MPEG 1, Layer 3 (VBR) or WAV (44.1kHz)
Audio Quality:
Dynamic Range:
80dB, Typical
Signal to Noise:
80dB, Typical
Frequency Resp.: 40Hz to 15kHz
THD:
< 0.5% at 1kHz, Typical
Audio Input:
Line:
10k ohm, RCA
Mic:
1.5k ohm, 1/8" mini jack, Low Z
Level:
+4dBm max., adjustable potentiometer
Audio Output:
Line:
600 ohm (+3dBm max.), RCA
Amplified:
2.5 watts into 8 ohm, 2 pin pluggable terminal
Level:
Adjustable potentiometer
Audio Memory:
Type:
Internal SD Card
Capacity:
1GB, 16+ hours of MP3 audio storage
1.5+ hours of WAV audio storage
Power Requirement:
Input Voltage:12vdc, or 15vdc
Current:
1 amp w/ Power Amp, 250mA w/o Amp
Connection: 2 pin pluggable terminal
Manual Control Interface:
Pushbuttons: Record Setup, Start/Stop, Select, Speaker
Display:
LEDs:
Memory OK, Message, Record, Play.
Mechanical:
Wall mountable chassis, rack mount option
6.5" wide x 4.5" deep x 1.2" high, 2 lbs.
18 gauge cold rolled steel chassis
Texture coated paint process
Regulatory Agency Approvals:
FCC, Part 15, Class A
UL/CSA approval on external power pack
2.4.2 Start/Stop
Plays default message. Holding button will repeat message. Play LED
illuminates during playback with Message LED blinking as to the message
number playing. Pressing this button while playing or recording stops the
process.
2.4.3 Select
Selects message to play or record. To select the active message, press and
hold for 2 seconds. The Minimac2 will display the location of the current
active message on the memory card. Additional presses will sequence
through all valid audio messages, from #1 to #4 as indicated on the
Message LED.
A “Play Sequential” mode is indicated by a solid Message
LED. Pressing the Start/Stop pushbutton stores the selected message as
the active message. This setting is saved through power outages.
2.4.2 Speaker
Toggles the setting of the on-board monitor speaker, ON/OFF.
2.5 LED Descriptions
2.5.1 Memory OK LED
Lit when the internal memory is installed with a valid message present.
Blinks when the memory is empty.
2.5.2 Message LED
Blinks during select, play or record with the message number selected. The
message number is indicated by the system blinking the number of times
matching the message number. Solid indicates sequential play mode.
(e.g.: blink
– blink, pause, blink – blink, pause indicates message #2)
When selecting the message number for recording, the Message LED will
indicate if a message is already located in that position by blinking fast. If
the location is empty, the Message LED will blink slowly.
2.5.3 Record LED
Blinks when unit is in record setup mode. Solid when unit is recording.
2.5.4 Play LED
Illuminates when unit is playing a message.
3. AUDIO FILE FORMATTING
The Minimac2 can use audio files that are formatted as either *.WAV (44.1kHz,
16 bit) or *.MP3 (44.1kHz, 32-320 kbps, VBR).
Messages may be mono, or stereo, but unit will only play the left side audio.
Message lengths can be any size from a couple seconds to several hours.
Audio files must be named numerically as shown below:
1.mp3 or 1.wav will be placed in message position 1.
2.mp3 or 2.wav will be placed in message position 2.
3.mp3 or 3.wav will be placed in message position 3.
4.mp3 or 4.wav will be placed in message position 4.
If more than 4 messages are detected by the system, the messages
following the 4
th
will only be played in sequential mode.
If the card has two files with the same name, but different suffix, the MP3 file
will play and the WAV file will be ignored.
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