567 is an audio decoder commonly used in automated telephone systems to detect and identify incoming call tones. It features a high-reliability, high-precision phase-locked loop (PLL) that ensures accurate signal processing. Depending on the configuration and component values, it can generate two distinct output frequencies: 1.5 kHz and 4 kHz. This makes it ideal for applications such as tone detection, signaling, and voice recognition in telecommunication systems. The device is known for its stability and performance, making it a popular choice in industrial and commercial settings. Additionally, its compact design allows for easy integration into various electronic circuits. 
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