Design of speech recognition circuit using AP70032 single chip microcomputer

　　The new single-chip voice recognition circuit HL7003-02 has a simple circuit structure and few peripheral components. It is very easy to design, manufacture, adjust and operate. It is suitable for enthusiasts to make various voice-controlled amusement machines, home appliance control, smart toys, voice door locks, door bells, etc. It is a single-chip IC that recognizes voice based on the user's own voice input. It can recognize 12 different words and sentences, and can control different output switches to complete the specified functions.

　　Circuit features: built-in microphone amplifier, built-in A/D converter, 12 1.5 second long sentence recognition. Multi-function I/O port, 2 normal input pins, 4 trigger input pins, 2 output ports, including a 4 output port and an output port, 2 LED output drivers, different encoding methods, can be made into dedicated lines, 2.4V~3.3V working voltage, low power consumption, automatic power-off function.

　　Single chip speech recognition circuit HL7003-02

　　1. After power on, press key ① first, LED1 and POA1 (LED3) light up at the same time, then speak to the microphone immediately (speech length does not exceed 1.5 seconds), POA1 turns off, LED1 lights up, then "learn" into the microphone, LED2 and POA1 light up at the same time, indicating that the "learning" is successful. Then press key ② again, LED 1 and POA2 light up at the same time. And so on, until all keys 1 to 12 are learned. You can also input and learn a key or several keys in a disorderly manner.

　　2. After learning, you can perform voice recognition operation. The 12-way output can control different electrical appliances (or actions) respectively. The 12-way voice recognition can be operated arbitrarily, that is, shouting a sentence can control the on or off of an electrical appliance. The 11th key is the output conversion key, and you need to press this key every time you switch to control an electrical appliance.

　　3. If you need to clear the "learning" content, press the clear key "C". When you enter again, you must repeat the "learning" method in step 1.

　　4. When PIM1 is connected to "1" (high level), it is 12-key mode, and the application circuit is shown in the figure. When PIM1 is connected to "0" (low level), it is 8-key mode, and the application circuit is shown in Figure 2. When POSL is connected to "0", POA1~POA12 outputs are low level, and when POSL is connected to "1", POA1~POA12 outputs are high level.