In the era of"Everything is Smart",offline voice control technology is gradually changing the mode of human-computer interaction,and pushing devices to move towards a voice interaction experience of"clear hearing,quick response and more reliability".Offline speech recognition chip focuses on the scene where local speech processing can be completed without network,providing stable and low-delay speech recognition capability for all kinds of intelligent terminals.

 

 

　　Off-line speech recognition technology is essentially a speech recognition system with small vocabulary,low power consumption and low cost.The complete workflow of off-line speech recognition chip can be divided into three main stages:front-end speech signal processing,local model matching and back-end recognition decision.Different from on-line speech recognition,the off-line scheme puts all the recognition calculations on the device side without uploading to the cloud,so it has obvious advantages in response speed,privacy protection and no network environment.At present,this technology has been widely used in smart home appliances,voice remote controllers,smart toys,vehicle voice control and smart homes.
 

 

2.Overview of low-power AT6811 series off-line speech recognition chips.

 

　　Take AT6811 of Yingshang Microelectronics Agency as an example.This chip is an ultra-low power off-line intelligent speech recognition SoC(system on a chip)designed by Zhixinke,which is specially developed for terminal devices of the Internet of Things,and can realize efficient and accurate local voice interaction in a network-free environment.Through innovative hardware architecture and algorithm optimization,the AT6811 off-line speech recognition chip has greatly improved the voice interaction experience in smart home,wearable devices,industrial control and other fields.

 

 

　　AT6811 off-line speech recognition chip integrates many advanced speech processing technologies:adaptive beamforming algorithm can suppress about 90%environmental noise;ADC with dynamic range over 70dB ensures the consistency of pickup in near and far fields.The nonlinear echo cancellation module can effectively distinguish the audio output of the device from the user's voice.The three work together,even in noisy kitchen or living room environment with background music,the chip can still maintain more than 92%recognition accuracy.

 

　　In the aspect of expansibility and system integration,AT6811 off-line speech recognition chip provides a wealth of interface options,including I2S digital audio interface,PDM microphone direct channel and low-power Bluetooth 5.0 controller.Its modular design allows developers to flexibly configure peripheral solutions according to actual needs.For example,a smart door lock manufacturer uses its Bluetooth dual-mode function to realize local voice unlocking while retaining the ability of remote control of mobile APP.

 

 

　　①It can still achieve millisecond response in complex acoustic environment;

 

　　②ntegrate dynamic noise suppression technology to improve anti-interference ability;

 

　　③Constructing a multi-level security barrier through voiceprint recognition,environmental modeling and semantic analysis;

 

　　④Off-line speech recognition chip supports high-quality speech broadcast and high-precision voiceprint collection.

 

5.Application of low-power AT6811 series off-line speech recognition chips:

 

　　①Intelligent household appliances:voice-controlled TV,air conditioner,fan,lamps and kitchen appliances,etc.

 

　　②Smart home central control:off-line voice switch panel,intelligent gateway and sensor linkage control;

 

　　③Children's toys and educational hardware:localized voice interaction of story machine,learning machine and other devices;

 

　　④car voice assistant:supports off-line voice commands such as air conditioning,window and basic navigation;

 

　　⑤Industrial control and Internet of Things:suitable for off-line voice operation of industrial equipment and interaction with industrial computer;

 

　　⑥Wearable devices:provide offline voice command support for smart watches/bracelets;

 

　　⑦Equipment with high privacy requirements or without network environment:such as medical equipment,security system and special terminal for special environment.


Keywords : Off-line Speech Recognition Chip