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Maximum 12 voice groups. Combination of voice building blocks to extend playback duration.
Two triggering modes are available by whole chip option during voice compilation. Voice Group Trigger Options: Built-in oscillator to control sampling frequency ap8921 an external resistor.
PWM Vout1 and Vout2 drive speaker directly. Development System support voice compilation and options selection. Two trigger modes, simple Key trigger mode and Parallel CPU trigger mode facilitate different user interface.
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User selectable triggering and output signal options provide maximum flexibility to various applications. PC controlled programmer and developing software are available.
OSC During voice playback, an external resistor is connected between this pin and the VDD pin to set the sampling frequency. Voice Blocks are then selected and grouped into Voice Groups for playback.
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Up to 12 Voice Groups are allowed. Each of the voice file is divided into a number of fixed length Voice Block and stored into the memory. On the other hand, voice data are stored as 8-bit PCM format means no data compression is employed but voice playback quality will be better. Options only affect the playback of individual Voice Group are called Group Options.
Four settings are allowed: Stop plus must be set to enable in ap98021 to datashwet STOP plus to come out.
Each Voice Group can have its only independent trigger options See Fig. Trigger options defined in Fig.
In stead, it acts as a Strobe input to clock-in the data input from S1 to S4 into the chip. S1] with SBT as strobe signal.
This parameter is inversely proportional to the sampling frequency.
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This parameter is proportional to the sampling frequency. Oscillator frequency is subjected to IC lot to lot variation.
C1 is capacitor from 0. Rb is base resistor from Ohm to Ohm depends on Vdd value and transistor gain.
T is an NPN transistor with beta larger than Refer to the Oscillator Resistor Table for suitable value of Rosc. Substrate should be a89021 to Vss. English version – Aplus Integrated Circuits Inc.