Products
STM-700 multi-track studio tape recorder
Features:
| 8-16-24 track sound recorder of studio quality |
|
All
control units incorporated - input-output switching with matrix panel,
100 cue-point autolocator, varispeed with crystal reference
|
| Extremely favourable weight, overall dimensions and power consumption |
|
Modular mechanical and electrical construction |
| 14' NAB spools |
| Full microprocessor control |
| Protected memory, set-ups stored for unlimited time |
| Two individually programmable outputs for each channel |
| Channels programmable individually or in groups |
| Programmable electronic editing with cyclic rehearse |
| Automatic status indication |
| Full remote control facility for all functions, channel matrix, autolocator, varispeed included |
Microprocessor control
Tape
transport with autolocator and vari-speed, audio electronics and
erase-bias oscillator are all microprocessor controlled. Functions are
implemented in softvare combining highly sophisticated control logic with
flexibility. Realization of new functions, adaptation to individual needs are
possible without hardware modification.
Electronics
Tape
transport and audio switching, timing and shape of erase and bias
current envelopes are controlled by the microprocessor. Realtionship
between tape speed and audio, erase and bias timing maintained in the
full varispeed range. Precision of electronic editing permits drop-in into
a program break as short as 0.03 s.
Track electronics-record, replay and sync amplifiers, erase and bias output
stages - are located on a single PC board for each track. Master erase and
bias oscillator common to all tracks arranged on a separate board.
Line outputs and channel control
Each
channel has a line input and two separate outputs. Using the control
panel, arranged as a switching matrix, either the input, or the replay or the
sync signals can be routed to the outputs or the outputs can be muted.
Signals at the outputs adapt automatically to the modes of operation (play,
record, spooling, stop). E.g. outputs are muted in playback until the tape
attains the nominal speed.
Channels can be controlled individually or can be arranged on four groups
and controlled together. The microprocessor control offers a high degree
of freedom in manipulation. Five different channel "programs", independent
of each other, can be prepared, stored and re-called any time. The programs
are retained by the battery protected memory for an unlimited time.
The channel control panel can be switched over to automatic display mode
in which it will indicate the instantaneous states of the outputs in each mode.
Autolocator and varispeed
100
tape times can be stored in memory registers numbered 0 to 99. By
pressing a button the current tape time is transfered from the tape timer
to
the memory and the memory address counter is incremented. Memory
registers can be addressed, read and written independent of tape timer
using the numeric keyboard.
In the SEARCH mode the autolocator positions the tape with one frame
(25 ms) accuracy either to the given point or, in the Auto Prerolled Search
mode to the point 5 seconds prior to the given point. Automatic editing
is
implemented, one selects the drop-in and drop-out tape times and the
editing is performed by the machine. The edit can be rehearsed, the edited
version can be listened to and readjusted without altering the existing
recording on the tape.
Tape speed is variable within -34% to +50% around the standard speeds
in steps of 0.1% or 1/4 tones. Crystal reference servo control ensures
high
tape speed accuracy not only at standard speeds but throughout the full
vari-speed range.
Specifications
| Tape transport | |
| Tape format |
8 tracks 1" tape 16,14 tracks 2" tape |
| Tape thickness | 50 µm (standard) |
| Reel size | NAB reels, diameter 14" maximum |
| Tape speed | 38.1 cm/s (15 ips) and 19.05 cm/s (7 1/2 ips) Variable within - 34% to +50% around nominal speed with builth-in varispeed. Tape speed quarz controlled vari-speed mode included. |
| Tape slip | max. 0.1 % |
| Wow and flutter (IEC Publ. 386 or DIN 45507 peak weighted) |
38.1 cm/s: 0.04% 19.05 cm/s: 0.06% |
| Fast wind time | 150 sec for 1450 m (4570 feet) of tape |
| Electronic tape timer |
displaying hour, minute, second and frame
|
| Remote control | all transport modes and electronic functions, auto-locator and vari-speed included |
| Audio electronics | |
| Input | electronically balanced, transformerless |
| minimum | input impedance 20 kOhm |
| minimum | input level -16dBV(re 0.775V) |
| maximum | input level +20dBV(re 0.775V) |
| Output | electronically balanced, transformerless |
| maximum | output impedance 10 kOhm |
| maximum |
output level +20dBV(re 0.775V) on 600 Ohm |
| Equalization 38,1 cm/s | 35 µs (IEC) 50 and 3180 µs (NAB) |
| Equalization 19.05 cm/s |
70 µs (IEC) 50 and 3180 µs (NAB) |
| Erase and bias frequency |
80 and 160 kHz respectively |
| Overall performance |
The following data are valid for the 8 and 16 track versions and to IEC equalization, with 3 M 256 tape or equivalent. Nominal tape fluxivity 510 nWb/m. (Data for the 24 track version on separate data sheet.) |
| Record reproduce 38.1 cm/s |
30 Hz - 20,000 Hz ± 2 dB |
| Record reproduce 19.05 cm/s |
30 Hz - 16,000 Hz ± 2 dB |
| Record-sync 38.1 cm/s |
30 Hz - 20,000 Hz ± 2 dB |
| Record-sync 19.05 cm/s |
30 Hz - 16,000 Hz ± 2 dB |
| Signal-to-noise ratio unweighted, RMS, bandwidth 22 Hz - 22 kHz, re 1020 nWb/m |
38.1 cm/s - 70 dB 19.05 cm/s - 68 dB |
| Adjecent track crosstalk 19.05 cm/s, worst case Recordreproduce | 1 kHz 46 dB |
| Adjecent track crosstalk 19.05 cm/s, worst case Recordsync |
1 kHz 22 dB 10 kHz 10 dB |
| Distorsion |
1 kHz 1% (510 nWb/m) (0.5% with BASF910 tape) |
| Erasure Power requirements |
220 V 50 Hz (60 Hz on special order) |
| Power consumption | 600 VA max. |
| Safety standard | IEC Publ. 215 (1978) |
| Dimensions |
980X800X750 mm |
| Weight | 180 kp (397 Ibs) |
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