Description
The CXD2721Q-1 is a Karaoke LSI suitable for use in video CD/LD/CD-G/CD and the like. A large capacity DRAM and AD/DA converters are built in, and a Karaoke mode providing simple surround and Karaoke functions such as key control, microphone echo and voice cancelling, and a music mode providing functions such as surround, parametric equalizer and bass/treble tone control are contained on a single chip.

FEATUREs
• 3-channel 1-bit AD converter, decimation filter and prefilter operational amplifier
    S/N ratio: 92dB
    THD + N: 0.02%
    Filter pass band ripple: ±0.5dB or less
    Filter stop band attenuation: –41dB or less
    (all characteristics are typical values)
• 2-channel 1-bit DA converter, oversampling filter and post filter
    S/N ratio: 97dB
    THD + N: 0.005%
    Filter pass band ripple: ±0.2dB or less
    Filter stop band attenuation: –41dB or less
    (all characteristics are typical values)
• In addition to analog I/O, digital I/O (2-channel input/2-channel output) are provided.
    The interface also supports a wide variety of formats.
• 128K-bit DRAM for key control, microphone echo and surround processing

Functions
• Key controller pitch settings can be varied to a maximum of ±1 octave with a precision of 14 bits.
• Microphone echo delay time can be varied to a maximum of 278ms (when Fs = 44.1kHz).
• Voice canceller supports settings other than center using panpot volumes.
• Voice parametric equalizer
• Voice pitch shifter
• Mixing function to support sound multiplexing software
• Digital de-emphasis function
• Simple surround function
• Music mode (switches with Karaoke mode)
    Compressor function
    Parametric equalizer function
    Surround function
    Bass/treble tone control function

APPLICATIONs
    Equipment with Karaoke functions, such as video CD/LD/CD-G/CD, compact music centers, video games, etc.