Teac MMR-16 v4.0 - Manual (Page 47)

MMP-16 TASCAM MMP-16 Owner’s Manual • Chapter 3 • Keys and Status Displays 49
Meter LEDs
Each track has its own column of signal level LEDs that read the MMP-16 analog output signal off disk.
Each meter column contains eight LEDs. Functioning much like a tape machine’s peak meters, their
meters have a fixed rise time of <30 ms and a default decay time of <0.5 seconds.
The bottom level LED (-25) is a green presence indicator. Any time there is signal on the track there will
be an indication. The next three LEDs indicate signal levels of -12, -6 and 0 VU. The next two LEDs are
yellow and indicate +6 and +12 VU. The final two LEDs are red to indicate the audio peaks are at MAX
(3 dB below clipping) and CLIP, which means the signal has most likely exceeded the input capability of
the digital converter and may be distorted. The CLIP indicator acts as a peak-hold indicator during
playback. It is only reset when the MMP-16 is stopped and put into PLAY again.
A de-facto film/video industry standard for digital device monitoring is that 0 VU should be set to
indicate a signal level of -20 dBFS (decibels below full scale, i.e. 20 dB below the digital clipping level).
The MMP-16 default setup follows this recommendation with the MAX LED indicator set to turn on with
a signal 17 dB above the nominal 0 VU indication (just before all bits would be set true in the ADC). The
CLIP indication is typically adjusted for a 3 dB hotter signal (20 dB above 0 VU). These settings can be
adjusted in 1dB increments using Setup mode menu 520 (Meter Reference Level) for any dB reference
level from -15 dBFS to -24 dBFS.
See Chapter 8, Maintenance and Service for instructions on calibrating the outputs using the meters.
Machine Status LEDs
To the left of the LCD are 7 LEDs used to indicate the status of various MMP machine states (interlock,
busy, lock, etc.). These are described here:
•
The TONE LED is lit when menu 530 (Reference Tone) is set to On. Pressing play when this LED is
lit will cause all channels to output a 1kHz reference tone at 0 VU.
•
The MIDI LED is used to indicate a valid MIDI input signal (MMC) is being received.
•
The ERROR LED indicates an error state has occurred and must be cleared before normal operation
can resume.
•
The BUSY LED indicates the system is occupied with a task, and the transport keys are not available
until the system finishes the current task and the Busy LED goes out.
•
The LOCK LED indicates the system is locked to the incoming machine synchronization source
(usually time code, biphase, or the MMR Bus).
•
The OFFSET LED indicates there is an offset (value other than 0) in the offset register (local MMP
offset) or when there is an MMR bus offset and the unit is a slave on the MMR bus.
•
The INTERLOCK LED lights when the system is in Biphase Chase Control Mode.