Description

The CXD2720Q 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, microphone echo and voice canceling 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 ±0.5dB

Filter stop band attenuation: less than –41dB

(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

• Microphone echo delay time can be varied to a maximum of 185ms (when Fs = 44.1kHz)

• Voice canceller supports settings other than center by the panpot volume

• Voice parametric equalizer

• Voice pitch shifter

• Mixing function to support sound multiplexing software

• Digital de-emphasis function

Applications

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