{"product_id":"asr-speech-recognition-module-ld3320","title":"ASR Speech Recognition Module - LD3320","description":"\u003cmeta name=\"description\" content=\"Buy ASR Speech Recognition Module - LD3320 online in India at best price from The Engineer Store, Bengaluru. Authentic product, 7-day warranty on manufacturing defects, fast delivery across India.\"\u003e\n\n\u003ch1\u003eASR Speech Recognition Module - LD3320\u003c\/h1\u003e\n\n\u003cp\u003eThe LD3320 is a compact, low-power automatic speech recognition (ASR) module designed for embedded voice control applications without requiring cloud connectivity. Professional developers and IoT engineers integrate this module into smart home devices, industrial control systems, and voice-activated robotics to enable offline voice command processing with minimal computational overhead. This module solves the critical challenge of implementing local speech recognition in resource-constrained environments while maintaining low latency and high accuracy for real-time voice interaction.\u003c\/p\u003e\n\n\u003ch2\u003eProduct Overview\u003c\/h2\u003e\n\u003cp\u003eThe LD3320 ASR module operates on a proprietary speech recognition algorithm optimized for Mandarin Chinese and English voice commands, delivering recognition accuracy up to 95% in controlled acoustic environments. The module features a built-in digital signal processor (DSP) that performs real-time audio feature extraction and pattern matching without requiring external processing power, making it ideal for standalone embedded applications. Its architecture utilizes vector quantization and hidden Markov models (HMM) for efficient phoneme recognition, enabling the device to operate with minimal RAM footprint while maintaining responsive command execution.\u003c\/p\u003e\n\n\u003cp\u003eWhat distinguishes the LD3320 from competing solutions is its ultra-low power consumption profile, drawing merely 40-50mA during active recognition and entering sleep mode at under 5mA, making it suitable for battery-powered applications. The module supports customizable vocabulary with up to 150 voice commands per application, allowing developers to tailor recognition models for specific use cases. Integration is straightforward through standard UART\/SPI interfaces, with comprehensive firmware support for both fixed-phrase recognition and continuous speech detection modes.\u003c\/p\u003e\n\n\u003ch2\u003eKey Specifications\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctr\u003e\n\u003ctd\u003eSpecification\u003c\/td\u003e\n\u003ctd\u003eDetails\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct Type\u003c\/td\u003e\n\u003ctd\u003eASR Speech Recognition Module\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eModel\u003c\/td\u003e\n\u003ctd\u003eLD3320\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOrigin\u003c\/td\u003e\n\u003ctd\u003eOriginal\/Authentic\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWarranty\u003c\/td\u003e\n\u003ctd\u003e7 days on manufacturing defects\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eShipping\u003c\/td\u003e\n\u003ctd\u003e1-5 days from Bengaluru\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDelivery\u003c\/td\u003e\n\u003ctd\u003e7-8 days across India\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSupport\u003c\/td\u003e\n\u003ctd\u003e24\/7 via Email and WhatsApp\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Voltage\u003c\/td\u003e\n\u003ctd\u003e3.3V to 5V DC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCurrent Consumption\u003c\/td\u003e\n\u003ctd\u003e40-50mA (active), 5mA (standby)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRecognition Accuracy\u003c\/td\u003e\n\u003ctd\u003eUp to 95% in optimal conditions\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCommand Vocabulary\u003c\/td\u003e\n\u003ctd\u003eUp to 150 customizable voice commands\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInterface\u003c\/td\u003e\n\u003ctd\u003eUART\/SPI digital communication\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAudio Input\u003c\/td\u003e\n\u003ctd\u003eAnalog microphone input with integrated amplifier\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProcessing Latency\u003c\/td\u003e\n\u003ctd\u003e200-500ms average recognition time\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Temperature\u003c\/td\u003e\n\u003ctd\u003e-10°C to +60°C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eOffline Voice Recognition: Complete speech processing occurs locally without cloud dependency, ensuring privacy and eliminating network latency for instant command execution\u003c\/li\u003e\n\u003cli\u003eUltra-Low Power Consumption: Draws only 40-50mA during active operation and 5mA in sleep mode, enabling extended battery life in portable and IoT devices\u003c\/li\u003e\n\u003cli\u003eCustomizable Command Set: Supports up to 150 programmable voice commands per application, allowing developers to train recognition models for domain-specific vocabularies\u003c\/li\u003e\n\u003cli\u003eIntegrated Microphone Amplifier: Built-in analog front-end with automatic gain control (AGC) and noise suppression, eliminating need for external audio preprocessing circuits\u003c\/li\u003e\n\u003cli\u003eFast Recognition Response: Delivers command recognition within 200-500ms, providing responsive user experience for real-time voice control applications\u003c\/li\u003e\n\u003cli\u003eMulti-Language Support: Native support for Mandarin Chinese and English with flexible firmware for regional accent adaptation\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eApplications and Use Cases\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eSmart Home Automation: Integrate into voice-controlled lighting systems, HVAC units, and security devices where offline operation ensures functionality during internet outages\u003c\/li\u003e\n\u003cli\u003eIndustrial IoT Devices: Deploy in factory floor robots and machinery control systems requiring hands-free voice commands in noisy environments with minimal processing overhead\u003c\/li\u003e\n\u003cli\u003eWearable Voice Interfaces: Embed in smartwatches, hearing aids, and personal assistants where low power consumption extends battery life to multiple days\u003c\/li\u003e\n\u003cli\u003eAutomotive Voice Control: Implement in vehicle infotainment systems and hands-free calling applications requiring sub-500ms latency for safe driver interaction\u003c\/li\u003e\n\u003cli\u003eEducational Robotics: Use in programming educational robots and interactive learning devices where voice recognition teaches students about embedded systems and AI\u003c\/li\u003e\n\u003cli\u003eMedical Monitoring Devices: Deploy in patient alert systems and voice-activated medical equipment where privacy-preserving local processing meets regulatory compliance\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eHow to Use\u003c\/h2\u003e\n\u003cp\u003eBegin integration by connecting the LD3320 module to your microcontroller via UART interface at 9600 baud rate, supplying 3.3V to 5V power through the dedicated power pins. The module requires a standard electret microphone connected to the analog input with appropriate biasing resistors; refer to the datasheet for recommended circuit topology. Initialize communication by sending the module configuration commands to define your custom voice command vocabulary, which the firmware stores in internal flash memory for persistent operation across power cycles.\u003c\/p\u003e\n\n\u003cp\u003eDuring operation, the module continuously monitors the microphone input and triggers recognition processing when voice activity detection (VAD) identifies speech patterns. Upon successful command recognition, the module transmits a recognition result packet via UART containing the matched command ID and confidence score. Developers should implement serial interrupt handlers to capture these recognition packets and trigger corresponding application logic. For optimal accuracy, train your custom command set using the provided training utility, speaking each command 3-5 times at normal volume to build robust acoustic models that handle speaker variation and background noise.\u003c\/p\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cdetails\u003e\n\u003csummary\u003eDoes the LD3320 require internet connection for speech recognition?\u003c\/summary\u003e\n\u003cp\u003eNo, the LD3320 performs all speech recognition processing locally on the module itself using embedded algorithms. This offline capability ensures privacy, eliminates network dependency, and provides instant command response without cloud latency. You can deploy it in applications without internet connectivity.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow many voice commands can I program into the LD3320?\u003c\/summary\u003e\n\u003cp\u003eThe LD3320 supports up to 150 customizable voice commands per application. Each command occupies minimal flash memory due to efficient HMM-based compression. You can reprogram the command set at any time using the provided firmware update utility without replacing hardware.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat is the typical recognition accuracy and how can I improve it?\u003c\/summary\u003e\n\u003cp\u003eThe module achieves up to 95% recognition accuracy in controlled acoustic environments with clear speech. Accuracy depends on microphone quality, background noise levels, and command vocabulary diversity. Improve accuracy by training each command multiple times (3-5 repetitions), maintaining consistent speaking distance from the microphone (10-30cm), and minimizing background noise during training and operation.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan the LD3320 recognize continuous speech or only fixed commands?\u003c\/summary\u003e\n\u003cp\u003eThe LD3320 is optimized for fixed-phrase command recognition, where each trained command is a discrete utterance. While it supports continuous speech detection to identify when a user is speaking, it cannot perform continuous speech-to-text transcription like cloud-based services. It excels at recognizing predefined command phrases within longer speech.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat microphone type should I use with the LD3320?\u003c\/summary\u003e\n\u003cp\u003eUse a standard electret condenser microphone (ECM) with 2-10kHz frequency response and sensitivity around -40dBV\/Pa. The module includes an integrated preamplifier with automatic gain control, so external amplification is unnecessary. Avoid omnidirectional microphones in noisy environments; consider directional or noise-canceling microphones for improved performance in industrial settings.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhen will I receive my order?\u003c\/summary\u003e\n\u003cp\u003eOrders are dispatched within 1-5 business days from our Bengaluru warehouse. Delivery takes 7-8 days to most locations across India.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat is your return and warranty policy?\u003c\/summary\u003e\n\u003cp\u003eWe offer a 7-day return policy on manufacturing defects only. Contact support within 7 days of receipt for free replacement or full refund. Not applicable for user damage or misuse.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eAre bulk discounts available?\u003c\/summary\u003e\n\u003cp\u003eYes, wholesale pricing for orders of 10 or more units. Contact our sales team via WhatsApp or email for a customized bulk quote.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003ch2\u003eWhy Buy from The Engineer Store\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eGenuine Products: Sourced directly from authorized distributors with authentication\u003c\/li\u003e\n\u003cli\u003eExpert Team: Our technical team validates every product before listing\u003c\/li\u003e\n\u003cli\u003eFast Shipping: Dispatched within 1-5 days from our Bengaluru warehouse\u003c\/li\u003e\n\u003cli\u003ePan-India Delivery: 7-8 days to Mumbai, Delhi, Chennai, Hyderabad, Pune, Kolkata\u003c\/li\u003e\n\u003cli\u003ePayment Options: COD, UPI, credit\/debit cards, net banking, EMI available\u003c\/li\u003e\n\u003cli\u003eTechnical Support: 24\/7 expert guidance via email and WhatsApp\u003c\/li\u003e\n\u003cli\u003eReturns: 7-day return policy on manufacturing defects only\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eBuy ASR Speech Recognition Module - LD3320 Online in India\u003c\/h2\u003e\n\u003cp\u003ePurchase the \u003cstrong\u003eASR Speech Recognition Module - LD3320\u003c\/strong\u003e online at \u003ca href=\"https:\/\/theengineerstore.in\"\u003eThe Engineer Store\u003c\/a\u003e, India's trusted source for genuine electronics. We deliver across Bengaluru, Mumbai, Delhi, Chennai, Hyderabad, Pune, Kolkata, Ahmedabad, Jaipur, and Surat. Get the best price on \u003cstrong\u003eASR Speech Recognition Module - LD3320\u003c\/strong\u003e with fast shipping and expert support.\u003c\/p\u003e\n\u003cp\u003eOur team in Bengaluru is available 24\/7 to support your journey from product selection to project completion.\u003c\/p\u003e","brand":"My Store","offers":[{"title":"Default Title","offer_id":43856823976099,"sku":"TES-EV00082240","price":2293.84,"currency_code":"INR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0628\/4479\/7091\/products\/Speech_Recorder-228x228.jpg?v=1704281209","url":"https:\/\/www.theengineerstore.in\/te\/products\/asr-speech-recognition-module-ld3320","provider":"The Engineer Store","version":"1.0","type":"link"}