HLK-V20 new AI intelligent offline voice recognition module kit

HLK-V20 is a new high-performance pure offline speech recognition module for a large number of pure offline control scenarios and products, which can be widely and quickly applied to smart homes, various smart small appliances, 86 boxes, toys, lamps, industry products that require voice control, such as medical care, Internet of Things, automobiles, security, and lighting. The module uses a 32-bit RSIC architecture core and adds a DSP instruction explicitly set for signal processing and speech recognition, an FPU operation unit that supports floating-point operations, and an FFT accelerator. The audio signal is trained and learned through the neural network to improve the recognition ability of the speech signal.
HLK-V20 supports offline recognition of 150 local instructions, and can freely customize wake-up words, command words, and response broadcast words, and has rich peripheral interfaces.

Product parameters:

Product advantages:
1) Small-size package
• The module size is only 16x18mm
• Reserve more design space for customers
2) Local voice wake-up/recognition/broadcast
• Customizable start-up broadcast
• Customizable voice wake-up words
• Customizable voice command words
• Support wake-up-free words (no need to wake up, directly recognize command words)
3) Custom wakeup/command words
• The number of command words reaches 150
• No need to train the model
• Support Chinese and English
4) General serial port protocol
• Voice wake-up words and command words are in one-to-one correspondence with the serial port protocol
5) Serial port output protocol data after local voice recognition
• Use the USB cable to supply power to the test board, and then connect the speaker and microphone.
• Open the PC serial port tool, and the serial port configuration is 115200-8-N-10
• Use the wake-up word to wake up. The serial port outputs the protocol data after the module recognizes the wake-up and command words. The serial port output format is not fixed, and the later customization can be set according to the customer’s MCU.

Module pin description:

The module has 16 pins, including amplifier output, differential input, and serial port. See the table below for specific definitions:

Product reference circuit design:
★The signal output by the module can be connected to the 1O port of the MCU. The MCU program can read the status of the 10 pins of the module. When the voice command word is executed, the corresponding 1O port outputs the level so as to achieve intelligent control.

★The high and low levels output by the module drive some switching devices to conduct, such as transistors, MOS tubes, relays, etc. As shown in the figure below, when the voice command is executed, the corresponding port 10 outputs the level to drive the triode/MOS tube to conduct so that the back-end loads (such as lamps, motors, etc.) work.

★The PWM signal that the module can output is used for dimming and speed regulation, as shown in the figure. Generally, the driver IC with dimming/speed regulation has a PWM pin input. (Support 2-way PWM)

★The module can be used with the serial port of the MCU. The voice module outputs protocol data through the serial port after recognizing the voice command, and the serial port of the MCU receives the data from the serial port of the voice module for processing.