Eventide BD500, Руководство оператора

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BD500 Broadcast Profanity Delay Chapter 2 Operation Page 7
©Eventide Inc. 1995-1999
doc release 10
Understanding BD500 Profanity Delay Functions
This section uses the tape recorder profanity delay as an analogy to describe how the Eventide digital broad-
cast delay behaves when used as a profanity delay. The digital broadcast delay can be likened to a tape recorder
with some new features. A basic tape recorder profanity delay would look like this:
When the delay is placed in line, the microphone (audio source) is connected to the record head while the
transmitter is connected to the play head. This introduces a delay determined by the speed of the tape and
the distance between the tape heads.
In our analogy the speed of the tape is con-
s t a n t . T h e d i s t a n c e b e t w e e n h e a d s i s
measured in seconds and there is enough
room between the tape heads for 8 seconds of
delay. Factory default values are used when-
ever a time or duration is mentioned.
The Eventide system offers these features:
REBUILD - Increase the delay gradually
This feature allows the time between the play head and record head to be increased, in a subtle and trans-
parent way. At the start the play head and record head overlap (no delay). The record head is slowly moved
to the left until 8 seconds of delay exists. The Eventide patented rebuild process does this in about 120 sec-
onds without causing a pitch change in the audio. Rebuild is used to recover from a dump, without having to
go to a break.
RAMP TO ZERO - Decrease the delay gradually
This feature is similar to rebuild except that the record head is moved to the right, in a subtle and transpar-
ent way, again taking a few minutes. When the record head reaches the play head, the unit is at live. Ramp
to zero is used to exit from delay when the call-in portion of a program is over.
WAIT FOR SAFE - Bring delay from 0 seconds to 4 seconds quickly
When the wait for safe process is started, the tape is bypassed so the transmitter gets live audio. The record
head is moved to the left by 4 seconds. After 4 seconds of recording, the transmitter is reconnected to the tape
delay. There is now a 4 second delay. Note, since the initial 4 second segment of audio will be repeated at the
play head, it is up to the user to prevent the live audio from going over the air. This feature is used to start a
show, coming from a network news feed, traffic report or other non-delayed program.
WAIT AND EXIT - Decrease the delay to 0 seconds quickly
This front panel feature is a method of quickly reducing the delay to 0.00 seconds. This process marks where
on the tape the record head was when wait and exit is started. When that piece of tape reaches the play head,
the record head is moved to the play head, decreasing the delay suddenly to 0.00 seconds. Use this command
when a call-in show needs delay but where a break to non-delayed operation is required.
SNEEZE - Edit the delay before a bad noise happens
This feature is used to stop the record process temporarily. While the SNEEZE button is pressed, the record
head moves toward the play head at the same speed as the tape, not recording any audio, until the SNEEZE
button is released (at which point the record head stops), or until the record head reaches the play head, at
which point the silence is recorded to the tape.
DUMP - Edit the delay after a bad noise happens
DUMP is used to edit several seconds of audio from the delay. Pressing DUMP moves the record head 3
seconds toward the play head (or up to the play head, whichever is less). This causes the most recent 3 sec-
onds of audio from the microphone to be discarded.
See Appendix C for a description of optional Remote Control Connector features.
play
head
tape
direction
record
head