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Audio Signal Selector for Radio Stations
1) Introduction: Section A
An audio signal selector is an important element that helps establish effective audio signal selection in a radio station. An audio signal selector consists of a stereo audio switch circuit in order to establish a unit to gate 1 kHz sinusoidal output from a level audio oscillator to produce a tone burst waveform. Designing a circuit for an audio signal selector is to be done based on multiple considerations, including the gating, oscillation of waveforms and the required output. The working of an audio signal selector is based on the circuit created. The design includes a choice of stereo inputs and stereo outputs.
2) Design Concept and Block Diagram : Section B
The design concept is based on forming an audio source signal selector with 3 inputs and 1 output function. The design is based on functioning of the source signal and requires a micro controller. The 3 input units would be controlled by this micro controller. A discrete relay and SMD components are to be placed in order to formulate an effective system circuit for an audio signal selector. Multiplexer chips specifically designed for audio, with better harmonic distortion performance and "pop" reducing circuits can help improve the quality of the network circuit. The internal switching will be made possible through the use of CMOS components.