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    • 3. 发明授权
    • System and method for precise DTMF signal detection
    • 用于精确DTMF信号检测的系统和方法
    • US06560331B1
    • 2003-05-06
    • US09407829
    • 1999-09-28
    • Todor CooklevMark Gray
    • Todor CooklevMark Gray
    • H04M300
    • H04Q1/4575
    • A method and system for facilitating the detection of DTMF tones is disclosed. The method is based on detecting two tones using a modified nonuniform discrete Fourier transform that includes a phase correction term for each DTMF tone and harmonic. The disclosed method is employed by a DTMF detector that includes a sampling module, a computation module, an analysis module, and a decode module. The sampling module samples an input signal from a communication network at a rate sufficient to avoid data loss. The sample signal is then placed through a modified DFT which is more precise than filters or analog devices, particularly those utilizing a Goertzel algorithm. The computation module implements a fast recursive algorithm for completing the necessary computations. The analysis module checks for the present of energy level peaks at the DTMF tones and their harmonics. Once a DTMF signal is verified to contain a DTMF tone, the decode module transmits the,number, letter, or symbol to an interface.
    • 公开了一种便于检测DTMF音调的方法和系统。 该方法基于使用修改的非均匀离散傅立叶变换来检测两个音调,其包括每个DTMF​​音调和谐波的相位校正项。 所公开的方法由包括采样模块,计算模块,分析模块和解码模块的DTMF检测器采用。 采样模块以足以避免数据丢失的速率对来自通信网络的输入信号进行采样。 样本信号然后通过修改的DFT放置,该DFT比滤波器或模拟装置更精确,特别是使用Goertzel算法的那些。 计算模块实现快速递归算法,用于完成必要的计算。 分析模块检查在DTMF音调及其谐波处的能量峰值的存在。 一旦DTMF信号被验证为包含DTMF音,则解码模块将数字,字母或符号发送到接口。
    • 5. 发明授权
    • Method and apparatus for determining interconnections of network devices
    • 用于确定网络设备互连的方法和装置
    • US07631064B1
    • 2009-12-08
    • US09835059
    • 2001-04-13
    • Mark Gray
    • Mark Gray
    • G06F15/173G06F15/16
    • H04L41/0631H04L41/0213H04L41/0226H04L41/0893H04L43/0811H04L43/0817H04L43/50
    • A method and apparatus is disclosed for determining interconnections of network devices. The network devices are connected together based on a set of general guidelines. A first network device is associated with a power state that is changed. Whether an alteration occurs at a second network device in response to the change in power state of the first network device is identified and stored. The changing of the power state of the first network device may be in response to a third network device and may be performed via a power controller. The alteration at the second network device may be a link becoming hot or the raising of a trap that is set at a switch. Errors are identified by comparing whether an alteration is identified to information in a database. Different types of interconnections may be determined in a series of phases by testing different types of devices.
    • 公开了一种用于确定网络设备的互连的方法和装置。 网络设备基于一组一般准则连接在一起。 第一网络设备与改变的功率状态相关联。 识别并存储响应于第一网络设备的功率状态的改变而在第二网络设备发生改变。 第一网络设备的功率状态的改变可以响应于第三网络设备,并且可以经由功率控制器来执行。 第二网络设备上的改变可以是链路变热,或者设置在交换机处的陷阱的提升。 通过比较是否将更改识别为数据库中的信息来识别错误。 可以通过测试不同类型的设备来在一系列阶段中确定不同类型的互连。