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.