Panasonic 744T User Manual
744T User Guide and Technical Information
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firmware v. 1.04
Features and specifications are subject to change. Visit www.sounddevices.com for the latest documentation.
Glossary of Terms
daily folder
a directory generated by the recorder each calendar day.
dither
the process of adding noise to an audio signal to increase the accuracy of low-level signals when bit-reducing a digital bit stream. In
general, dither should be engaged if reduction from 24 bit to 16 bit audio is needed.
general, dither should be engaged if reduction from 24 bit to 16 bit audio is needed.
LED
(l)ight (e)mitting (d)iode. The 744T uses ultra-efficient GaN LEDs for all positions. LED brightness is fully variable.
play
the state of the “transport”. The 744T is reading audio data from disk and sending to any output that has tracks selected.
play-pause
when the stop/pause key is pressed while play is occurring the recorder goes into play-pause mode. This allow user to cue an audio
file by holding down the ff and rew keys or to skip to the next or previous file by single pressing ff and rew.
file by holding down the ff and rew keys or to skip to the next or previous file by single pressing ff and rew.
play-stop
when the stop/pause key is presses following play-pause.
plesiochronous
pronounced plee-see-AH-krun-us (from the Greek plesos, meaning close; and chronos, meaning time) a term describing a condi-
tion where two or more signals are nearly synchronized. For example, a communication system of digital devices where the clocks
between a transmitting and receiving device aren’t locked directly to one another (as in a master and slave relationship), but are
both highly accurate and are running at the “same” rate (same, meaning, in literal terms, “nearly” the same). There are standards
governing the rate of deviation allowed before a system can be considered plesiochronous. Short of that it would be asynchronous.
One real world example of a plesiochronous system might be two word clock generators that both are deriving their clock rate from
a common black burst generator. We usually would think of this as a synchronous system (and it generally will work), but depending
upon how accurate the two generators really are it could fall into the plesiochronous category. Similarly, two word clock generators
running on their own would tend to be an asynchronous system, but could, if accurate enough, fall into the plesiochronous range.
tion where two or more signals are nearly synchronized. For example, a communication system of digital devices where the clocks
between a transmitting and receiving device aren’t locked directly to one another (as in a master and slave relationship), but are
both highly accurate and are running at the “same” rate (same, meaning, in literal terms, “nearly” the same). There are standards
governing the rate of deviation allowed before a system can be considered plesiochronous. Short of that it would be asynchronous.
One real world example of a plesiochronous system might be two word clock generators that both are deriving their clock rate from
a common black burst generator. We usually would think of this as a synchronous system (and it generally will work), but depending
upon how accurate the two generators really are it could fall into the plesiochronous category. Similarly, two word clock generators
running on their own would tend to be an asynchronous system, but could, if accurate enough, fall into the plesiochronous range.
track monitor
post-record audio signal sent to output buses or headphones. Track monitor audio is program played from the hard drive after being
written. Because all audio signal is routed through RAM buffers before writing to hard drive and/or Compact Flash, there is a sub-
stantial delay when monitoring track audio during recording.
written. Because all audio signal is routed through RAM buffers before writing to hard drive and/or Compact Flash, there is a sub-
stantial delay when monitoring track audio during recording.