The BA7726AS and BA7726AFS are analog companders for karaoke echo systems and have internal logarithmic compression and expansion circuits, a stereo line mixer amplifier, vocal fader function, vocal detection function, microphone ALC, microphone ON / OFF switch, and output switch. When used together with the BU9252 8-bit digital delay, these ICs form a high-grade karaoke echo system with minimum components.

Features
1) Internal stereo line mixer amplifier, allowing selection of through output, left output, or right output.
2) Internal vocal elimination function, suitable for vocal faders and left and right output.
3) Echo level and loop ratio are DC-adjustable with the internal electronic volume control (EVR).
4) Internal microphone ON / OFF switch.
5) Vocal detection.
6) Internal microphone ALC function.
7) Internal anti-popping circuit.

Applications
    Portable CD stereos with karaoke functions, VCRs, mini component stereo systems, LD players