For easy dubbing instructions
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MAKING AUDIO CASSETTES WITH
SMPTE TIME CODE
FOR
TIME CODED TRANSCRIPTION
FOLLOW THESE FOUR SIMPLE
STEPS:
1. Use a stereo cassette recorder to
create a time coded audio cassette.
2. Record audio on the
right channel (channel two), and record
SMPTE time code on the left channel (channel
one). If you get these backwards, don't
worry about it; we can deal with that contingency.
It's so easy that producers make these tapes
in the field with no problem.
3. Set your recording levels to minimize
the time code bleeding into the audio, but
keep the time code record level within 8
db below zero. Time code at -5 db below
zero works fine.
4. Never record time coded
audiocassettes with Dolby on. (Optional:
Send a sample tape with at least two minutes
of audio and time code to Word Wizards as
a free check.)
Connecting to your cassette deck
Connect the time code source to the line
input on your Phillips-type audiocassette
recorder. This requires a patch cable. The
exact type of patch cable depends on the
socket on the cassette recorder and the
socket on the time code source.
Most Phillips cassette decks have female
RCA sockets on the line inputs. Professional
decks may have a three pin XLR (Cannon
style) connector.
However, all kinds of sockets are used for
time code.
Female BNC connectors are popular outlets
for time code on camcorders and older VCRs.
Professional decks tend to put balanced
line time code out through three female
pin XLR connectors. Industrial and "prosumer"
decks seem to tend towards female RCA connectors.
You'll need the right cable to get from
your time code source to the cassette recorder's
line input.
If you are using RCA connectors, be certain
that they make good contact. That connector
style is notorious for making lousy connections.
If XLR connectors are involved, you should
be alert for two problems:
a) If the time code comes from an XLR, you
may have balanced line time code.
Take only one leg of it (making sure which
is ground) to get your time code source.
Check the time code sources manual because
the pin assignments aren't consistent.
b) If the recorder has an XLR line
input, don't assume that you can simply
patch it into a time code out XLR.
That time code source may be balanced
line and you'll need to take one leg
only to feed the cassette deck.
Record levels
Record levels are important for a good quality
recording. Word Wizards has to charge
more for poor audio recordings because the
transcriptionists can type faster longer
when the audio is clear and free from interference
from time code.
If your Phillips audiocassette recorder
doesn't have any record level controls,
we would suggest you not use it. It probably
has AGC (Automatic Gain Control) which constantly
adjusts the recording volume to keep the
loudness even. Unfortunately, most AGC systems
raise and lower both channels simultaneously.
When the audio on channel two is very soft,
the AGC compensates by cranking up the record
volume by blasting time code on channel one
to painful levels. Conversely, a loud burst
of audio on channel two lowers the recording
volume and can make the time code on channel
one too soft to read.
The key is to set the time code record volume
on channel one as loud as or lower (softer)
than the audio you're recording on channel
two. The trick is determining the best setting.
That is the setting where the time code
is as loud as possible without interfering
with the audio on the adjacent channel.
However, the time code level should never
be more than 8db below zero. As we said
in the introduction, set time code at the
-5db below zero for a perfect dub.
Using a cheap $59 RCA cassette
recorder (Catalog #14-680, Model - SCT-510),
record both channels at
0db. There is some time code interference
on the audio channel, but further lowering
the time code record level doesn't help
and makes the time code difficult to read.
If you use the Optimus, light up all three
green lights on the left and right channels.
If you have a professional cassette deck,
record the audio at 0db, and record the
time code at -3 to -8db (W). Keep the time
code level as high as you can to be sure
the time code read will track properly.
Never record below -8db below zero.
Regardless of how fancy your cassette recorder
is, you're likely to have some time code
interference in the audio track. One facility
engineer described time code as the "beach
sand of the video business." Don't worry.
Word Wizards has developed sophisticated
systems to remove a great deal of that time
code interference.
You might want to make a short sample recording
and send it to Word Wizards for checking.
We'll help you find the right levels. When
you find levels that work, mark them down
for future reference. There is no charge
to check your sample tape.
Word Wizards can even align our playback
units to exactly match your record deck if
you give us a tape with at least two minutes
of 1,000 Hz on only channel two (right channel).
Please call to arrange for this service.
It's only necessary to include this tone
on the first tape (test tape) you send.
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