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.
標簽： Telecommunications Processing Signal for
上傳時間： 2020-06-01
上傳用戶：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.
標簽： Space-Time Processing
上傳時間： 2020-06-01
上傳用戶：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.
標簽： Wireless-Based Software Systems
上傳時間： 2020-06-01
上傳用戶：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.
標簽： Cryptography Lightweight Networked Systems RFID and
上傳時間： 2020-06-08
上傳用戶：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.
標簽： electromagnetic response Seismic control using
上傳時間： 2021-11-04
上傳用戶：a1293065
AVR系列單片機Altium Designer AD原理圖庫元件庫CSV text has been written to file : 3.1 - AVR系列單片機.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
標簽： avr 單片機 altium designer
上傳時間： 2022-03-13
上傳用戶：
STM32F103開發板 DHT11溫濕度DS18B20 氣體MQ-2光敏聲控雨滴傳感器實驗程序**--------------------------------------------------------------------------------------------------------** CREATED by: FiYu** CREATED date: 2015-12-12** Version: 1.0** Descriptions: DHT11溫濕度傳感器實驗 **--------------------------------------------------------------------------------------------------------** 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 參 : 無 * 返回值 : 無 **************************************************************************************/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); //將外設GPIOA寄存器重設為缺省值 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9; GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP; //推挽輸出 GPIO_Init(GPIOB, &GPIO_InitStructure); GPIO_DeInit(GPIOA); //將外設GPIOA寄存器重設為缺省值 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9; GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; //推挽輸出 GPIO_Init(GPIOA, &GPIO_InitStructure); GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING; //浮空輸入 GPIO_Init(GPIOA, &GPIO_InitStructure); GPIO_SetBits(GPIOB , GPIO_Pin_9); //初始狀態，熄滅指示燈LED1}/************************************************************************************** * 描 述 : 串口顯示實時溫濕度 * 入 參 : 無 * 返回值 : 無 **************************************************************************************/void DHT11_SCAN(void){ if( Read_DHT11(&DHT11_Data)==SUCCESS) { printf("\r\n讀取DHT11成功!\r\n\r\n濕度為%d.%d ％RH ，溫度為 %d.%d℃ \r\n",\ DHT11_Data.humi_int,DHT11_Data.humi_deci,DHT11_Data.temp_int,DHT11_Data.temp_deci); //printf("\r\n 濕度:%d,溫度:%d \r\n" ,DHT11_Data.humi_int,DHT11_Data.temp_int); } else { printf("Read DHT11 ERROR!\r\n"); }}/************************************************************************************** * 描 述 : MAIN函數 * 入 參 : 無 * 返回值 : 無 **************************************************************************************/int main(void){ SystemInit(); //設置系統時鐘72MHZ GPIO_Configuration(); USART1_Init(); //初始化配置TIM DHT11_GPIO_Config(); // 初始化溫濕度傳感器PB1引腳初始時為推挽輸出 GPIO_ResetBits(GPIOB , GPIO_Pin_9); delay_ms(500); while(1) { GPIO_SetBits(GPIOB , GPIO_Pin_9); DHT11_SCAN(); //實時顯示溫濕度 delay_ms(1500); } }
上傳時間： 2022-05-03
上傳用戶：得之我幸78
