Summary of information:

Guangzhou Nine Chip Electronic Technology Co., Ltd. is a high -tech enterprise focusing on voice technology research. It mainly provides voice IC, voice chip, voice module, voice bips, voice alarm, forklift speeder, automotive speed limiter and other businesses Serve....

There are two audio output methods for voice chips. The main difference between the two is that PWM can directly connect the speaker, and DAC is to connect to the power amplifier and then connect the speaker.

PWM: Output is an abbreviation of English Pulse Width Modulation. PWM output is a direct connection of the speaker or connected to the special PWM audio power amplifier IC.

DAC: The abbreviation of Digital to Analog Converter. The DAC output signal must first pass the amplifier circuit and then connect the speaker. The DAC of the voice IC is generally an current DAC that outputs the signal of the current change, so the I-R circuit is generally converted into a voltage signal when the merit is put on. The simple I-R circuit is to connect a resistor to the ground to turn into a voltage signal at the DAC output foot to the ground signal signal. Essence

This two output methods generally choose to use that voice output method when writing.