Description
The CXD2720Q-2 is a digital signal processor LSI for Karaoke, suitable for use in LD/CD/CD-G/video CD and the like.
A large capacity DRAM and AD/DA converters are built in, and Karaoke functions such as key control and microphone echo are contained on a single chip.

Features
• 3-channel 1-bit AD converter and decimation filter
    S/N ratio: 88 dB
    THD + N: 0.016%
    Filter pass band ripple: less than ±0.008dB
    Filter stop band attenuation: less than –62dB (all characteristics are typical values)
• 2-channel 1-bit DA converter and oversampling filter
    S/N ratio: 98dB
    THD + N: 0.006%
    Filter pass band ripple: less than ±0.2dB
    Filter stop band attenuation: less than –41dB (all characteristics are typical values)
• In addition to analog input/output, 2-channel input/2-channel output of digital input/output are provided. The interface also supports a variety of formats.
• 128K-bit DRAM for key control and microphone echo processing

Functions
• Key controller pitch setting can be varied to a maximum of ±1 octave with a precision of 14 bits
• Two key controllers are provided. For their pitches, either of common or independent setting is possible
• Key controller can be used for voice
• Microphone echo delay time can be varied to a maximum of 185ms (when fs = 44.1kHz)
• Voice parametric equalizer
• Mixing function to support sound multiplexing software
• Digital de-emphasis function
• Soft mute function

Applications
    Equipment having Karaoke function, such as LD/CD, compact music center, video games, etc.