TECHNICAL NOTE
Audio Accessory ICs
Karaoke/Surround Digital Echo
BU9253AS/FS, BU9262AFS
●Description The Karaoke/Surround Digital Echo IC incorporates a digital delay circuit, an input/output mixing circuit, supporting Karaoke echo and surround system, all in a single chip.
BU9253AS/FS has functions required by Karaoke echo system, and BU9262AFS has various functions required for surround / echo system.
●Features <BU9253AS/FS> 1) Digital delay time : 131ms (fCLK = 375kHz) 2) Built-in mixing circuit for adding original sound and echo sound 3) Echo mix ratio settable by DC
voltage 4) Built-in amplifier circuit for structuring input/output secondary LPF 5) Microphone mute function (mute of mi...