Interpretation of SPCE061A intelligent car voice recognition system circuit

　In recent years, intelligent and automated technologies have attracted more and more attention in the field of toy manufacturing. This article introduces the design of an intelligent car control system - a voice-controlled car. The voice-controlled car is a representative product based on SPCE061A. It is launched with the 61 board and comprehensively applies many resources of SPCE061A. The car uses voice recognition technology and can control its driving status through voice commands.

　　Speech recognition technology has been a very active research field in recent years. The practical research of speech recognition system is a major direction of speech recognition research. Taking the toy market as an example, electronic toys and intelligent toys with high-tech content are developing rapidly, and electronic interactive and intelligent toys have become the mainstream of the toy industry. my country is a major toy producer and exporter, but there is a big gap between China and foreign countries in the development of high-tech toys. Therefore, timely investment of energy and extensive research in this area have great practical significance for both technological innovation and application and social and economic development. Communicating with machines by voice and letting them understand what you say is something that people have long dreamed of. Speech recognition technology is a high technology that allows machines to convert speech signals into corresponding text or commands through the process of recognition and understanding. In the past two decades, speech recognition technology has made significant progress and has begun to move from the laboratory to the market. The speech recognition function greatly increases the fun of using toys and makes toys reflect a certain degree of intelligence, so it has become a key technology used in the design of most electronic toys and intelligent toys.

　　This paper uses the Sunplus microcontroller to design an intelligent remote control car with voice recognition function. This design changes the remote control car from a traditional manual remote control to a voice recognition remote control, integrating advanced voice recognition technology. With the maneuverability of the car, the controller can control the car through voice to achieve preset actions, thereby freeing the controller's hands, and there is also a certain interactive function between the car and the controller. Therefore, this research has strong practicality and development prospects.

　　Design of relay drive circuit

　　Since the current provided by the I/O port of the microcontroller is too small to directly drive the relay, the 8050NPN tube is used here to provide a switching voltage to realize the I/O port driving the relay; IN4007 is used to remove the reverse current generated by the coil when the relay is disconnected to protect the 8050NPN tube from being damaged. The relay drive circuit is shown in the figure.

　　Design of driving state control circuit

　　As shown in the figure, the driving state control circuit is shown in the figure. The driving state of the entire car is controlled by two motors, MOTOR A and MOTOR B. MOTOR A controls the two wheels on the left side of the car, and MOTOR B controls the two wheels on the right side of the car. The specific control is shown in the figure.

Microphone recording input and AGC circuit#e#

　　Microphone recording input and AGC circuit

　　The microphone circuit is shown in the figure. Lingyang's SPCE061A is a 16-bit single-chip microcomputer with DSP function, strong information processing capability, the highest clock can reach 49M, and has the advantage of high computing speed, etc., which provides conditions for voice playback, recording, synthesis and recognition. The system is connected to the MIC circuit as shown in the figure below. MIC serves to record voice recognition commands. Microphone recording input and AGC circuit.

　　Voice broadcast circuit

　　The schematic diagram of the audio part is shown below. In the figure below, you can see two jumpers, which are used to measure the output waveform of the DAC; in addition, unplugging the jumper can disconnect the path from the DAC to the speaker amplification, making the DAC channel in an open circuit state. This makes it easier to use the DAC for other purposes, and users can use this jumper to add their own peripheral circuits.

　　This design makes comprehensive use of the rich hardware resources of SPCE061A and successfully realizes the voice control function. The following is a brief introduction to some resource advantages in practical applications: In terms of hardware, high execution speed, built-in hardware multiplier, ADC and DAC functions, and built-in AGC automatic gain link provide a strong foundation for voice processing. In terms of software, standard C language programming and rich voice resource functions provide great convenience for programming. The design scheme has a simple structure and realizes voice playback and recognition as well as motor control functions with a single chip, which is equivalent to the function of "voice recognition chip + ordinary single-chip microcomputer". However, it is much simpler to implement than the "voice recognition chip + ordinary single-chip microcomputer" scheme, and the cost will be much lower.