NEC Electronics announced the PD9971 melody chip [.jpg image ] for mobile phones, which offers a 3-D positioning function with built-in real-time processing, stereo 16-bit DA converter and 128 polyphonic tones. The combination of features will help OEMs deliver dynamic sound quality with on-chip functions including pitch bend, vibrato, delay, reverb, chorus, compression and Doppler. The chip is also compatible with Mobile XMF and Standard MIDI Files (SMF).
Real-time timbre is reproduced with PCM sound source system.
Maximum of 128 sounds being simultaneously pronunciation possibility, it draws up & reproduces richer music.
3D positioning サラウンド function of rial-time processing is built in.
MOBILE-XMF is supported.
As one for イコライジング of the speaker, the digital parametric equalizer is built in.
Because the MIDI port of 4 ports is loaded inside the sound source core, it is possible to play back 4 tunes simultaneously.
The advanced stereo 16 bit DA converter for audio is built in.
Audio DAC sampling frequency (fs) it corresponds to 5 types of 8kHz/16kHz/32kHz/44.1kHz/48kHz.
Audio serial input/output interface (16 bits) it has equipped.
Input frequency of the serial data is variable possible to 32fs – 64fs. (At the time of slave mode)
The format corresponds to right stuffing left stuffing IIS.
Serial input/output interface outside the sound source is equipped.
Stereo line output for audio is equipped.
8 bits parallel interface and serial interface are equipped as a CPU interface.
Control output function of vibration and LED is built in.
Because the one for internal master clock formation PLL is built in, it is correspondence possible in the various input clocks.
Digital power source (DVDD) the business regulator is built in.
Power supply voltage I/O power source (EVDD): 1.7 – 3.3V and the power source for PLL (PLLVDD): 2.7 – 3.3V and analog power source (AVDD): 2.7 – 3.3V and regulator power source (REGVDD): 2.7 – 3.3V
