The rt_script.m is the main program. It generates a text file and a PDF report to log the estimated reverberation time. Two measurement methods can be used: 1) Speaker On-Speaker Off Method, and 2) Balloon Burst Method. The documentation provides basic programs for both methods. It has been found that the Speaker On-Speaker Off Method is significantly more accurate than the Balloon Burst Method. The Balloon Burst Method tends to have over 50% error below 1000 Hz. The reverb_time.m calculates the reverberation time from the 1/3 octave band time logs. Time records of random test signals, generated by the script makelNHANESNoisesm_ed.m (also available on MATLAB Central File Exchange), are ideal for measuring reverberation time using the Speaker On-Speaker Off Method. The Balloon Burst Method can be used to process the same file multiple times to roughly estimate the reverberation time for each 1/3 octave band.
Reverb Time Calculator Estimating Reverberation Time from Multiple Microphone Records Using Time Log-MATLAB Development
相关推荐
Fill Missing Data in Time Series Using NaN in MATLAB
该代码有助于填补时间序列数据中的空白。为此,它需要一个缺少日期和时间的 DateTime 数组以及具有相应缺失值的 测量数组。它将检查日期数组中缺少的日期,并为测量数组中的相应日期填充 NaN,这将有助于获取连续的时间序列数据。
Matlab
0
2024-11-03
Linux Soft Real-Time Target v2.4Custom Linux Target for Real-Time Workshop in MATLAB Development
The Linux Soft Real-Time Target is defined by MathWorks for Real-Time Workshop. The target uses the POSIX real-time clock to generate periodic signals, waking up the model process at each time step. The process runs with the highest priority as defined by the scheduler, requiring root privileges to execute. The Linux soft real-time target does not operate as a hard real-time system because the Linux kernel itself is not preemptive. Thus, model execution can sometimes experience delays. The standard Linux kernel preempts every 10 ms. To achieve higher resolution task switching and improve execution precision, one can modify the HZ value in asm/param.h (included in the kernel source code) and recompile the kernel. To include C S-Functions from other directories, place the rtwmakecfg.m file found in this package into the source directory of the C S-Function. The C S-Function must then be processed accordingly.
Matlab
0
2024-11-06
MATLAB Code for Cross Sectional Area Analysis from Time Series Data in Excel
This MATLAB code imports time-series data related to riverbank and water depth coordinates in XY format, sampled every 10 minutes. The code calculates the cross-sectional area for each water depth and writes the following data to an Excel file: Date/Time, Water Depth, and the cross-sectional area for each water depth.
Matlab
0
2024-11-06
Differential MPSK on Rayleigh Fading Channel MATLAB Development for Time-Varying Channels
在时变瑞利衰落信道上进行差分MPSK调制的研究。通信为点对点形式,源与目的地通过无线瑞利信道进行通信。该信道随时间变化,这正是移动通信中的常见情况。自相关值决定了通道的变化速度,对信号的传输特性有着重要影响。
Matlab
0
2024-11-06
Wireless Real-Time Warehouse Management System Using ADO and ACCESS
《无线实时仓库管理系统(ADO+ACCESS):数据库应用与源代码解析》无线实时仓库管理系统是一种先进的企业管理工具,尤其在物流、仓储行业中有着广泛的应用。该系统基于DELPHI编程语言开发,结合了ADO(ActiveX Data Objects)数据访问技术与ACCESS数据库,实现了用户登录模块、系统管理、仓库管理和出入库管理四大核心功能。
用户登录模块是系统的第一道防线,确保只有授权用户能够访问系统。在DELPHI中,可以利用内置的VCL组件如TButton、TEdit和TLabel构建用户界面,配合数据库查询验证用户名和密码,实现安全登录。ADO提供了一种高效的方式来连接和操作数据库,使得登录信息的验证更为便捷。
系统管理部分通常包括角色权限分配、系统设置等功能。在ACCESS数据库中,可以创建相关的表来存储用户信息和权限,DELPHI通过ADO接口进行数据操作,实现对这些信息的增删改查。此外,系统设置可能涉及数据库配置、日志记录等,这都需要开发者具备一定的数据库管理和编程技巧。
仓库管理是系统的核心,涉及到库存商品信息、位置管理等。在ACCESS数据库中,设计合理的数据表结构以存储这些信息,如商品表、库存表、货架位置表等。DELPHI通过ADO连接数据库,展示数据到界面上,并实现库存查询、统计等功能。同时,DELPHI的事件驱动编程模型使得用户界面的交互更加直观和流畅。
出入库管理是仓库操作的关键环节,包括入库登记、出库审批、库存更新等流程。在设计这一部分时,开发者需要考虑事务处理的完整性,确保数据的一致性。例如,当一个商品入库时,需要在数据库中执行相应的插入操作,并更新库存数量;而出库时,则需进行减少库存的操作。这些操作通常会封装在存储过程或事务中,通过ADO调用执行。
尽管该系统已相对完整,但仍有提升空间。例如,可以引入更强大的SQL Server数据库以提高性能和稳定性;优化界面设计,提升用户体验;增加条形码扫描功能,实现快速出入库;还可以考虑集成移动设备,实现无线实时操作,提高工作效率。总结来说,无线实时仓库管理系统利用DELPHI的编程优势和ADO的数据访问能力,结合ACCESS数据库,构建了一个实用的仓库管理解决方案。然而,任何系统都有其局限性和改进空间,不断学习和实践,才能打造出更加完善的管理系统。
Access
0
2024-11-01
Top NoSQL Time Series Databases Overview
Time Series Database (TSDB) is a database system specifically designed for efficiently storing, managing, and processing time series data. This type of data typically involves numerical values associated with specific timestamps, commonly found in monitoring, IoT, financial transactions, and operational analytics. This article explores several key NoSQL time series databases, including InfluxDB, ScyllaDB, CrateDB, and Riak TS, as well as Apache Druid, highlighting their characteristics and application scenarios.
1. InfluxDB
InfluxDB, developed by InfluxData, is an open-source time series database designed for real-time analysis and big data. It features high write performance and low-latency query capabilities, supporting complex time series data queries. InfluxDB is particularly suited for handling data from sensors, logs, metrics, and is widely used in monitoring systems, IoT applications, and real-time analysis scenarios.
2. ScyllaDB
ScyllaDB is a high-performance distributed database based on Apache Cassandra. It offers higher throughput and lower latency than native Cassandra. Its optimized time series data processing capabilities make it ideal for real-time applications such as monitoring and log analysis. ScyllaDB supports multi-data center deployments to ensure high availability and consistency of data.
3. CrateDB
CrateDB is a column-oriented distributed SQL database that can handle large-scale time series data. It provides a SQL interface, making time series data operations more familiar to traditional database users. CrateDB is suitable for projects that require rapid analysis of large amounts of time series data and prefer using SQL for querying.
4. Riak TS
Developed by Basho Technologies, Riak TS is a NoSQL solution focused on time series data. It inherits the core features of Riak, such as high availability and scalability. Riak TS is suitable for applications that need to store and retrieve time series data in a distributed environment, such as recording equipment status in the telecommunications or energy industries.
5. Apache Druid
Although Druid is not a traditional NoSQL database, it is a columnar data store designed for real-time analytics. Druid is renowned for its excellent Online Analytical Processing (OLAP) performance and low-latency query capabilities, making it suitable for big data real-time analysis and business intelligence applications.
These databases each have their strengths. InfluxDB and Druid excel in real-time analytics, ScyllaDB and CrateDB offer powerful distributed processing capabilities, while Riak TS specializes in distributed storage and retrieval. Developers should consider data scale, performance requirements, query complexity, SQL support, and team expertise when choosing a solution.
NoSQL
0
2024-10-30
Signal_and_System_Time_Frequency_Analysis_and_MATLAB_Application
信号与系统:时域频域分析及MATLAB软件的应用
在信号与系统的研究中,时域和频域分析是两种基本的分析方法。时域分析关注信号随时间变化的特性,而频域分析则分析信号在不同频率上的分布。MATLAB软件作为一种强大的计算工具,可以有效地实现时域和频域分析,提供丰富的函数库来处理各种信号和系统。
时域分析
时域分析通常通过图形表示信号随时间的变化。例如,正弦波、方波等信号可以通过MATLAB的内置函数绘制。时域分析对于理解信号的瞬时特性、周期性等非常重要。
频域分析
频域分析则通过傅里叶变换等技术将信号从时域转换到频域,揭示信号在不同频率上的组成成分。MATLAB提供了FFT(快速傅里叶变换)等函数,可以快速进行频域分析,帮助研究人员理解信号的频谱特性。
MATLAB的应用
在MATLAB中,信号与系统的分析方法可以通过编程实现,包括滤波器设计、系统响应分析等。MATLAB不仅能够处理简单的时频分析任务,还支持复杂的信号处理和系统建模。
通过结合时域和频域分析,结合MATLAB软件的强大功能,用户可以深入理解信号与系统的行为,并设计出高效的信号处理方案。
Matlab
0
2024-11-06
CS4319_Time-开源项目概述
CS4319_Time-开源项目是由Tomy Le为陈平博士设计的数据挖掘开源软件。提供学习者和开发者探索、理解和应用数据挖掘技术的平台,鼓励协作与知识分享。项目核心包括数据挖掘的预处理、模式发现和后处理阶段,涉及时间序列分析、机器学习算法如监督学习和无监督学习,以及开源社区参与。支持Python编程,结合Pandas、Numpy、Scipy、Scikit-learn等库进行数据操作和机器学习。
数据挖掘
0
2024-10-12
Accelerating Real-Time Analytics with Spark and FPGAaaS
使用 Spark Streaming 进行实时分析
在当今数据驱动的世界里,实时数据分析变得至关重要。P.K. Gupta 和 Megh Computing 在 #HWCSAIS17 中提出了一种利用 Spark Streaming 结合 FPGA as a Service (FPGAaaS) 的技术来加速实时分析的方法。
Spark Streaming 用于实时分析
Spark Streaming 是 Apache Spark 的一个重要模块,它提供了对实时流数据处理的支持。通过微批处理的方式,Spark Streaming 能够高效地处理大量的流数据,并且能够与 Spark 的核心功能(如 SQL、MLlib 等)无缝集成。这使得 Spark Streaming 成为处理实时数据流的理想选择。- ETL (Extract, Transform, Load):Spark Streaming 支持从多种来源提取数据,进行转换处理后加载到不同的存储系统中。- 数据处理:包括清洗、聚合、过滤等操作,这些操作可以利用 Spark 的强大计算能力快速完成。- 机器学习 (ML) 和深度学习 (DL):Spark 的 MLlib 库提供了丰富的机器学习算法,而深度学习则可以通过第三方库如 Deeplearning4j 或 TensorFlow on Spark 实现。
为什么使用 FPGA:低延迟和高吞吐量
现场可编程门阵列 (FPGA) 是一种可编程集成电路,其特点是可以根据特定的应用需求进行定制化设计。FPGA 在处理高速数据流时表现出色,特别是在需要低延迟和高吞吐量的场景下。- 内联处理:FPGA 可以直接对接网络接口卡 (NIC),实现数据的内联处理。这种架构可以显著减少数据传输延迟,并提高处理效率。- 卸载处理:将一些计算密集型任务卸载到 FPGA 上执行,从而减轻 CPU 的负担并提升整体系统的性能。
使用 FPGA 加速器面临的挑战
尽管 FPGA 提供了诸多优势,但在实际应用中也会遇到一些挑战:- 开发难度:相比于传统的软件开发,FPGA 的开发过程更为复杂,需要专门的知识和工具支持。- 调试困难:FPGA 中的错误定位和调试比传统软件更加困难。- 资源限制:FPGA 资源有限,需要合理规划资源分配以避免瓶颈。
Megh 平台
Megh Computing 提出了相关解决方案。
spark
0
2024-11-01