CXD2720Q-2

CXD2720Q-2 Single-Chip Digital Signal Processor for Karaoke 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 100 pin QFP (Plast...