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Chapter 2 Operation
BD500 Broadcast Profanity Delay
©Eventide Inc. 1995-1999
doc release 10
Operation as a Profanity Delay
The BD500 may be used as a broadcast profanity delay. This is its primary function and factory default mode.
When power is first applied to the BD500, the unit's audio inputs and outputs are bypassed through a relay.
Pressing the BYPASS button places the unit in-line with 0.00 delay. If the audio levels are adjusted properly,
there should be no perceptible difference in audio levels. Note that since the BD500 uses true relay bypass,
there might be a slight click. The 3-digit display will now read 0.00 which indicates no delay. The red indica-
tors on several of the buttons will be lit, indicating which are valid choices. Which indicators are lit changes
depending on what state (or mode) the BD500 is in. Since the unit is at 0.00 delay and in-line it will be in live
mode. The following is a list of the few different modes the unit may be placed in:
Modes
• bypass and configuration - delay is set to 0.00 seconds, relays bypass the audio directly from input connec-
tors to output connectors.
• static - bypass relays are open (unit is in-line), delay is not changing.
• rebuild - bypass relays are open (unit is in-line), delay is slowly growing or is at maximum.
• ramp to zero - bypass relays are open (unit is in-line), delay is slowly reducing. Unit goes to static when it
reaches 0.00 delay.
• wait for safe - bypass relays are open (unit is in-line), delay is filling with audio, but outputs are seeing in-
put audio without delay. Unit switches to rebuild mode when safe delay time is reached.
• sneeze - bypass relays are open (unit is in-line), input audio is not going into delay, but output audio is com-
ing from the delay. The delay length is reducing rapidly. When the SNEEZE button is released the unit
will go back to the previous mode.
• wait and exit - bypass relays are open (unit is in-line), input audio is not going into delay, but output audio
is coming from the delay. The delay length is reducing rapidly. The unit will go into static mode when it
reaches 0.00 delay. The SNEEZE button is disabled.
Functions and Features
By default the BD500 is in bypass mode. Press the BYPASS button to put the BD500 in static mode. The
delay is now at 0.00 seconds and there should be no perceptible difference between bypass and static mode.
After delay build is initiated and until the delay is reduced back to 0.00, all audio must pass through the BD500
before going to the transmitter.
Starting a Show Segment with REBUILD
This process is used to start a show in a simple manner. The guest or dial-in caller is enabled in less than
two minutes. The host customarily uses this period for an introduction or monologue.
As a show starts, the delay is set to 0.00. Pressing the REBUILD button starts a process by which the delay
is slowly increased. During the rebuild process the REBUILD button's indicator will flash.
In less than two minutes (depending on characteristics of input audio) the BD500 will have enough delay
built up to be 'safe' for a caller to be placed on the air. The DUMP button will light up to confirm this. The
delay amount will show 4.00 and increasing. If configured, a rear panel output line will allow an external re-
lay to be closed, enabling the phone line.
