Automatically Provide Gain to Low Level Signals and Attenuation to High Level Signals

Automatically Provide Gain to Low Level Signals and Attenuation to High Level Signals

Automatically Provide Gain to Low Level Signals and Attenuation to High Level Signals

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The high performance ST-GCA3 is an automatic gain control amplifier that provides a constant average audio output despite variations in input levels. It is used extensively in broadcast production and transmission, conferencing and sound reinforcement systems.

The ST-GCA3 automatically provides gain to low level signals and attenuation to high levels. The adjustment rate is switch-selectable: SLOW for music or FAST for speech. With no audio on the input, AGC searching is limited to around 5 seconds. After a sustained period without audio, the outputs fade to a muted condition but instantly return to the proper level when audio is once again present.

Accurate setup of the ST-GCA3 is simplified by the inclusion of two LED indicators which vary to show the amount of signal expansion or reduction. To produce equal available expansion and reduction, a normal audio level is applied to the input and the gain is adjusted for minimum response of both LEDs.

The ST-GCA3 is often used in conjunction with the ST-CL2 Compressor / Limiter to provide a complete gain control package.

 

Application Diagrams Showing the ST-GCA3 in Use:

AN-2050 User-Controlled Voice-Over Paging with 70 V Amplification of BGM and Paging

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