This paper presents a Hidden Markov Model (HMM)-based speech enhancement method, aiming at reducing non-stationary noise from speech signals. The system is based on the assumption that the speech and the noise are additive and uncorrelated. Cepstral features are used to extract statistical information from both the speech and the noise. A-priori statistical information is collected from long training sequences into ergodic hidden Markov models. Given the ergodic models for the speech and the noise, a compensated speech-noise model is Created by means of parallel model combination, using a log-normal approximation. During the compensation, the mean of every mixture in the speech and noise model is stored. The stored means are then used in the enhancement process to create the most likely speech and noise power spectral distributions using the forward algorithm combined with mixture probability. The distributions are used to generate a Wiener filter for every observation. The paper includes a performance evaluation of the speech enhancer for stationary as well as non-stationary noise environment.
标签： Telecommunications Processing Signal for
上传时间： 2020-05-31
上传用户：shancjb
Driven by the desire to boost the quality of service of wireless systems closer to that afforded by wireline systems, space-time processing for multiple-input multiple-output (MIMO) wireless communications research has drawn remarkable interest in recent years. Excit- ing theoretical advances, complemented by rapid transition of research results to industry products and services, have Created a vibrant and growing area that is already established by all counts. This offers a good opportunity to reflect on key developments in the area during the past decade and also outline emerging trends.
标签： Space-Time Processing
上传时间： 2020-05-31
上传用户：shancjb
The wide deployment of wireless networks and mobile technologies, along with the significant increase in the number of mobile device users, have Created a very strong demand on various wireless-based, mobile-based software application systems and enabling technologies. This not only provides many new business opportunities and challenges to wireless and networking service providers, mobile technology ven- dors, and software industry and solution integrators, butalso changes and enhances people’s lives in many areas, including communications, information sharing and exchange, commerce, home environment, education, and entertainment. Business organizations and government agencies face new pressure fortechnology updatesto upgrade their networking infrastructures with wireless connectivity to enhance enterprise-oriented systems and solutions.
标签： Wireless-Based Software Systems
上传时间： 2020-06-01
上传用户：shancjb
The rapid growth of RFID use in various supply chain operations, which has arisen from the development of Electronic Product Code (EPC) technology, has Created a need for the consideration of security issues in the adoption of that technology.
标签： Cryptography Lightweight Networked Systems RFID and
上传时间： 2020-06-08
上传用户：shancjb
This paper presents a new type of electromagnetic damper with rotating inertial mass that has been devel oped to control the vibrations of structures subjected to earthquakes. The electromagnetic inertial mass damper (EIMD) consists of a ball screw that converts axial oscillation of the rod end into rotational motion of the internal flflywheel and an electric generator that is turned by the rotation of the inner rod. The EIMD is able to generate a large inertial force Created by the rotating flflywheel and a variable damping force devel oped by the electric generator. Device performance tests of reduced-scale and full-scale EIMDs were under taken to verify the basic characteristics of the damper and the validity of the derived theoretical formulae. Shaking table tests of a three-story structure with EIMDs and earthquake response analyses of a building with EIMDs were conducted to demonstrate the seismic response control performance of the EIMD. The EIMD is able to reduce story drifts as well as accelerations and surpasses conventional types of dampers in reducing acceleration responses.
标签： electromagnetic response Seismic control using
上传时间： 2021-11-04
上传用户：a1293065
AVR系列单片机Altium Designer AD原理图库元件库CSV text has been written to file : 3.1 - AVR系列单片机.csvLibrary Component Count : 34Name Description----------------------------------------------------------------------------------------------------AT90S2313 Atmel Microcontroller - Library Created by carel.. <www.mpfreezone.com>AT90S1200 Atmel Microcontroller - Library Created by carel.. <www.mpfreezone.com>ATTINY26 Atmel Microcontroller - Library Created by carel.. <www.mpfreezone.com>AT90S8515_DIP40 Atmel Microcontroller - Library Created by carel.. <www.mpfreezone.com>ATMEGA161_DIP40 Atmel Microcontroller - Library Created by carel.. <www.mpfreezone.com>ATMEGA162_DIP40 Atmel Microcontroller - Library Created by carel.. <www.mpfreezone.com>ATMEGA8515_DIP40 Atmel Microcontroller - Library Created by carel.. <www.mpfreezone.com>AT90S8515_TQFP44 Atmel Microcontroller - Library Created by carel.. <www.mpfreezone.com>ATMEGA161_TQFP44 Atmel Microcontroller - Library Created by carel.. <www.mpfreezone.com>ATMEGA162_TQFP44 Atmel Microcontroller - Library Created by carel.. <www.mpfreezone.com>ATMEGA8515_TQFP44 Atmel Microcontroller - Library Created by carel.. <www.mpfreezone.com>AT90S8535_DIP40 Atmel Microcontroller - Library Created by carel.. <www.mpfreezone.com>ATMEGA16_DIP40 Atmel Microcontroller - Library Created by carel.. <www.mpfreezone.com>ATMEGA163_DIP40 Atmel Microcontroller - Library Created by carel.. <www.mpfreezone.com>ATMEGA32_DIP40 Atmel Microcontroller - Library Created by carel.. <www.mpfreezone.com>ATMEGA323_DIP40 Atmel Microcontroller - Library Created by carel.. <www.mpfreezone.com>ATMEGA8535_DIP40 Atmel Microcontroller - Library Created by carel.. <www.mpfreezone.com>AT90S8535_TQFP44 Atmel Microcontroller - Library Created by carel.. <www.mpfreezone.com>ATMEGA16_TQFP44 Atmel Microcontroller - Library Created by carel.. <www.mpfreezone.com>ATMEGA163_TQFP44 Atmel Microcontroller - Library Created by carel.. <www.mpfreezone.com>ATMEGA32_TQFP44 Atmel Microcontroller - Library Created by carel.. <www.mpfreezone.com>ATMEGA323_TQFP44 Atmel Microcontroller - Library Created by carel.. <www.mpfreezone.com>ATMEGA8535_TQFP44 Atmel Microcontroller - Library Created by carel.. <www.mpfreezone.com>ATMEGA103 Atmel Microcontroller - Library Created by carel.. <www.mpfreezone.com>ATMEGA128 Atmel Microcontroller - Library Created by carel.. <www.mpfreezone.com>ATMEGA64 Atmel Microcontroller - Library Created by carel.. <www.mpfreezone.com>ATMEGA128(2) ATMEGA16L-8AIATMEGA16L-8PI ATMEGA48-10AI ATMEGA48-10PI ATMEGA8_DIP28 Atmel Microcontroller - Library Created by carel.. <www.mpfreezone.com>ATMEGA8_TQFP32 Atmel Microcontroller - Library Created by carel.. <www.mpfreezone.com>CC2530
标签： avr 单片机 altium designer
上传时间： 2022-03-13
上传用户：joshau007
STM32F103开发板 DHT11温湿度DS18B20 气体MQ-2光敏声控雨滴传感器实验程序**--------------------------------------------------------------------------------------------------------** Created by: FiYu** Created date: 2015-12-12** Version: 1.0** Descriptions: DHT11温湿度传感器实验 **--------------------------------------------------------------------------------------------------------** Modified by: FiYu** Modified date: ** Version: ** Descriptions: ** Rechecked by: **********************************************************************************************************/#include "stm32f10x.h"#include "delay.h"#include "dht11.h"#include "usart.h"DHT11_Data_TypeDef DHT11_Data;/************************************************************************************** * 描 述 : GPIO/USART1初始化配置 * 入 参 : 无 * 返回值 : 无 **************************************************************************************/void GPIO_Configuration(void){ GPIO_InitTypeDef GPIO_InitStructure; /* Enable the GPIO_LED Clock */ RCC_APB2PeriphClockCmd( RCC_APB2Periph_GPIOA | RCC_APB2Periph_GPIOB | RCC_APB2Periph_AFIO , ENABLE); GPIO_DeInit(GPIOB); //将外设GPIOA寄存器重设为缺省值 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9; GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP; //推挽输出 GPIO_Init(GPIOB, &GPIO_InitStructure); GPIO_DeInit(GPIOA); //将外设GPIOA寄存器重设为缺省值 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9; GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; //推挽输出 GPIO_Init(GPIOA, &GPIO_InitStructure); GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING; //浮空输入 GPIO_Init(GPIOA, &GPIO_InitStructure); GPIO_SetBits(GPIOB , GPIO_Pin_9); //初始状态，熄灭指示灯LED1}/************************************************************************************** * 描 述 : 串口显示实时温湿度 * 入 参 : 无 * 返回值 : 无 **************************************************************************************/void DHT11_SCAN(void){ if( Read_DHT11(&DHT11_Data)==SUCCESS) { printf("\r\n读取DHT11成功!\r\n\r\n湿度为%d.%d ％RH ，温度为 %d.%d℃ \r\n",\ DHT11_Data.humi_int,DHT11_Data.humi_deci,DHT11_Data.temp_int,DHT11_Data.temp_deci); //printf("\r\n 湿度:%d,温度:%d \r\n" ,DHT11_Data.humi_int,DHT11_Data.temp_int); } else { printf("Read DHT11 ERROR!\r\n"); }}/************************************************************************************** * 描 述 : MAIN函数 * 入 参 : 无 * 返回值 : 无 **************************************************************************************/int main(void){ SystemInit(); //设置系统时钟72MHZ GPIO_Configuration(); USART1_Init(); //初始化配置TIM DHT11_GPIO_Config(); // 初始化温湿度传感器PB1引脚初始时为推挽输出 GPIO_ResetBits(GPIOB , GPIO_Pin_9); delay_ms(500); while(1) { GPIO_SetBits(GPIOB , GPIO_Pin_9); DHT11_SCAN(); //实时显示温湿度 delay_ms(1500); } }
上传时间： 2022-05-02
上传用户：得之我幸78
