Based on the single-chip module, LD3320 speech recognition module and dual-degree-of-freedom PTZ module, an intelligent voice control system with intelligent speech recognition capability--Intelligent globe is designed. The globe drives the gimbal rotation by intelligently identifying the user's command to give the name of any country, causing the target country on the globe to face the user, simultaneously illuminating the LED lights representing the country's capital, and playing the country's profile information. This globe can be used in geography teaching and is a reliable, powerful and interesting teaching tool.
The voice chip LD3320 chip is a voice control chip based on non-personal voice recognition technology, which can realize voice recognition and MP3 playback. In order to make the chip work normally, a total of 42 pins need to be configured, and the AT89S52 single-chip microcomputer alone cannot directly configure the chip. Although the implementation of the extended I / O port can also be achieved, but in order to make the whole system work more stably and reliably, this paper selects the single-chip STC10L08XE as the co-MCU of the system to complete the control of the LD3320 voice module.
PTZ rotating circuit
The two-degree-of-freedom pan/tilt has four ports that control the direction of rotation, which are horizontal left turn, horizontal right turn, rise and fall, and need 24 V AC to drive, and the binary sequence of speech recognition results is decoded by the single chip AT89S52. I/O port output, whose port level is 0 ~ 5 V DC. In order to enable the MCU to drive the pan/tilt rotation based on the speech recognition result, a current amplifier component ULN2003 is placed between the AT89S52 and the pan/tilt. The ULN2003 is a high current, high voltage Darlington array that includes seven Darlington tubes that can be directly connected to TTL and CMOS circuits at 5 V operating voltage, allowing direct processing of standard logic buffers. Processed data. The four ports D_Right, D_Left, D_Up, and D_Down that control the direction of rotation of the gimbal are respectively connected to the relays K1, K2, K3, and K4, and the AT89S52 of the single-chip microcomputer controls the opening and closing of the relay according to the decoded speech recognition result, thereby controlling the gimbal. The direction and angle of rotation. The pan-tilt rotation circuit diagram is shown in the figure.
Speech recognition playback circuit
The speech recognition playback circuit is mainly composed of a voice chip LD3320, an STC10L08XE single chip microcomputer and other peripheral circuits. The voice chip LD3320 is internally solidified with a complete non-specific human speech recognition feature library and an efficient non-specific human speech recognition search engine module, without prior training and recording. Only the single-chip microcomputer needs to input the Pinyin string of the candidate recognition sentence into the chip, and find the best recognition result through the DSP algorithm inside the chip. At the same time, this chip also supports MP3 playback function. In this case, an external Flash chip is needed to store the sound material and other data. The STC10L08XE MCU reads the MP3 data of the serial memory chip and sends it to the LD3320 chip in turn to output the sound from the corresponding pin of the chip. The STC10L08XE MCU and the voice chip LD3320 use parallel communication, so the hardware data needs to use 8 data lines and 4 control signals to connect the voice chip and the MCU in parallel.
Reset circuit
In order to ensure that the smart globe has a unique position after each power-on or reset operation, it is necessary to set the initial rotational position. When the pan/tilt is transferred to the initial position, a judgment signal is sent to the AT89S52 of the single-chip microcomputer, indicating that the reset is completed, and speech recognition can be started. In this design, the photoelectric switch is used to complete the given signal. The photoelectric switch detects the presence or absence of an object by occlusion or reflection of the light beam by the detected object, and generally includes a transmitting portion and a receiving portion. The emitting portion radiates a light pulse from the light-emitting tube, and the receiving portion is a photo-transistor. When no object is covered, the phototransistor is turned on, and the resistance is extremely small; when there is an object, the resistance is extremely large [5]. In the system design, a baffle is arranged on the side of the gimbal platform, and the initial position is fixed to the photoelectric switch. When the gimbal is turned to the initial position, the baffle will stop at the center of the photoelectric switch, so that the photoelectric switch is in the off state, and a single-chip microcomputer will be given. Signal (low level 0), this signal is connected to the P3_7 pin of AT89S52 microcontroller.
Electronic enthusiast network technology editors comment analysis:
This paper adopts low-cost modular design, using single-chip control module, voice recognition module and pan/tilt rotation module to design an intelligent globe that can convert the user's voice command into the national geographic location. The globe can intelligently identify the name of the country spoken by any user, drive the pan-tilt to rotate the target country to face the user, illuminate the colored LED indicators representing the country's capital, and voice the country's detailed introduction, including population and area. Current leaders, geography, history, climate, resources, etc. Compared with other smart globes, the smart globe is easy to operate and interesting, and it can fully stimulate students' curiosity and curiosity. At the same time, the design is simple, the cost is low, and it is more suitable for popular use in schools.
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