Henry Engineering DigiStor MP - Manual

DIGISTOR-MP
HENRY ENGINEERING
MPEG DIGITAL AUDIO RECORDER 503 Key Vista Drive
Sierra Madre, CA 91024
Tel: 626.355.3656
Fax: 626.355.0077
www.henryeng.com
1.0 DESCRIPTION:
DigiStor-MP is a multi-message MPEG digital audio recorder. It can store up to 40 minutes of monaural audio with
a bandwidth of 15 kHz. DigiStor-MP records audio in “MP3” format, but can play MPEG audio files in MPEG layer
I, II, or III formats. Files recorded on a PC in these formats can be downloaded into DigiStor-MP via the integral
RS-232 interface. DigiStor-MP's multiple modes of use make it ideal for numerous applications in broadcasting,
telecommunications, and commercial sound: network news delay, station or translator ID and spot insert, message-
on-hold, news & actuality lines, call-in telephone information, museum exhibits & displays, sound effects,
announcements, etc. DigiStor-MP can store up to 99 messages which can be played in any order. Multiple
playback modes support one-time or repeat play, plus automatic sequencing and message "stacking". Messages
can be different lengths, and can be selectively recorded (or changed) without having to re-record other messages.
Messages are stored in non-volatile flash memory and are retained even if power is off. (No backup battery is
needed.) Recording and playback is via local or remote control. GPI control provides control of Messages #1 thru
#8; RS-232 control provides control of all 99 messages. (An optional RS-232/GPI interface permits GPI control of
all 99 messages.) DigiStor-MP can record from either a mic or line level source. Line input and output levels are
adjustable. Two relays are provided for end-of-message (EOM) signaling and peripheral equipment control. The
optional telephone coupler allows DigiStor-MP to be connected to a phone line for auto-answer single-message
playback.
2.0 INSTALLATION: DigiStor-MP can be wall or desk mounted. An optional rack mount kit is available.
2.1 DC POWER: Connect the included power supply via the POWER terminals. Observe polarity.
2.2 AUDIO INPUTS: DigiStor-MP can record from either a mic or line level source. To record from a mic, use the
1/8" MIC input jack. This input is unbalanced, and will accept any LO-Z mic signal. To record from a line source
(tape deck, audio mixer,) use the RCA LINE input jack. This input is unbalanced, and will accept a line level signal
between about -15 and +4 dBv. The input impedance is 10K ohms; termination is not required. NOTE: The MIC
and LINE inputs cannot be used simultaneously. Use either the MIC OR LINE input, not both at the same time.
2.3 AUDIO OUTPUTS: DigiStor-MP provides two audio outputs: one is at -10 dBm, the other is +4 dBm. Select the
output most appropriate for the equipment being driven. The -10 dBm output is via the RCA jack. This output is
balanced and transformer isolated, and will drive a 600 ohm load. It CAN be ground-referenced if necessary.
The +4 dBm output is via the output terminals labeled SPKR. This is an ACTIVE balanced (transformerless)
output. It can drive any load, including a loudspeaker, with a load impedance of 8 ohms or higher. Because this
output is electronically balanced, DO NOT connect either output terminal to ground. DO NOT reference the load to
ground. It is not necessary to terminate either output.
3.0 DESCRIPTION OF CONTROLS AND LEDs: DigiStor-MP uses front panel pushbuttons for local recording
and playback of messages and LEDs to indicate system status. They function as follows:
SWITCHES
RECORD SETUP
Push to enter/exit the Record Setup mode
MANUAL SYNC Push to “record” a SYNC relay cue
START/STOP Push to start or stop Play or Record function
SELECT Push to select the message to be played or recorded; hold to jump in 10-Msg. increments.
LEDs
POWER (on rear)
ON=Power on, system OK. FLASH=memory error. See Sec. 9.0.
OVERDRIVE ON=Audio input level too high. (Turn Input Level CCW)
AUDIO SENSE ON=Audio input signal present. OFF=No audio detected.
SYNC FLASH=Indicates SYNC relay cue
RECORD FLASH=Ready to record; ON=Recording in process
MESSAGE # Indicates which message is selected for play or record. Decimal points flash when
message has been recorded. (No decimal points indicate that message # is empty.)