5
Compression and Limiting Simultaneously
Both compression and limiting of audio program material whereby dynamic range can be maximized as well as elimination of audio
program peaks.
-The gain reduction, LED meter Vu meter indicates gain reduction. At this input level, the “threshold” LED will be illuminated
intermittently and not occasionally flicker.
-The amount of compression will be determined by the input level control setting. A visual representation, using the Gain reduction
LED meter indication should be readily apparent.
-This mode is used whenever a small to intermediate amount of compression is desired.
Compression Only
When the average level of the input signal to the V610 is continually above the full illumination "threshold" level, then compression
only occurs.
- Under this mode only “GR”, gain reduction occurs, (under this condition, longer release times are recommended.)
Output Level Control
The V610 utilizes two independent modules/circuits for audio signal compression and gain.
The compressor limiter function is controlled by the Model 601 Complimiter module.
The output control is a stepped, 24 position detent switch that is calibrated for log operation starting at 2db increments. It is important
that the user understands the relationship between input level, (gain), and output level, (make up gain).
Improper level adjustment can result in loss of dynamic range and possibly increased system distortion.
The V610 Complimiter has a gain of 65dB. Of the total, approximately 40dB of gain is provided by the second, 110A amplifier
module.
The sole purpose of the 110A module is to make-up gain for the unit. The output knob of the 610 controls the 110A module gain. If
the input gain is set at -40dBu as described earlier, then the amount of undistorted gain available is 65dB with 1.1-1 compression. This
is referenced at+24dBu maximum output, and indicated via the red overload indicator on the M610. Decreases in gain will result as
compression is increased.
Threshold
A flashing LED indicates transients, (peaks), at -40dBu and below. A constant LED indicates -40dBu and above for program material.
The threshold circuit operates at high frequencies well beyond conventional peak indicators. As a result, the V610 will indicate peak
amplitude material without the use of a specialized measurement device.
Overload Input
Complimiter Circuit Input overload
Overload Output
The red overload indicator LED will illuminate whenever excessive input or output signal level overload, (+22 dBu), occurs. In some
applications it is particularly desirable to utilize the overload indicator LED as a guide to obtaining additional limiting with the output
of the Model V610 Complimiter