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1. 发明授权

US5644505A Universal audio analyzer 失效
标题翻译：通用音频分析仪
公开(公告)号：US5644505A
公开(公告)日：1997-07-01
申请号：US418349
申请日：1995-04-07
申请人： Larry W. Soutar , Ronald W. Dale
发明人： Larry W. Soutar , Ronald W. Dale
IPC分类号： G11B27/36 , H04R29/00 , G06F17/00
CPC分类号： H04R29/001 , G11B27/36
摘要： A desktop computer having stereo audio input and output ports is used with an interface board to supply test tones to an audio device being tested. The interface feeds back the test device outputs to the computer audio input ports. The interface, under control of the computer, selects any two of several inputs from the device and attenuates the two signals to the optimum amplitude for analysis. The computer digitizes the audio inputs and simultaneously analyzes the signals by software operations in either time or frequency domain along with appropriate filtering to quickly obtain results according to standard test specifications.
摘要翻译：具有立体声音频输入和输出端口的台式计算机与接口板一起使用，以将测试音提供给被测试的音频设备。接口将测试设备输出反馈给计算机音频输入端口。该接口在计算机的控制下，从设备中选择几个输入中的任何两个，并将两个信号衰减到最佳幅度进行分析。计算机将音频输入数字化，同时通过软件操作在时域或频域分析信号以及适当的滤波，以根据标准测试规范快速获得结果。

2. 发明授权

US5991609A Low cost digital automatic alignment method and apparatus 失效
标题翻译：低成本数字自动对准方法及装置
公开(公告)号：US5991609A
公开(公告)日：1999-11-23
申请号：US774969
申请日：1996-12-26
申请人： Jeffrey Joseph Marrah , Thomas Joseph Kennelly , Michael John Easterwood , Linh Ngoc Pham , Ronald W Dale
发明人： Jeffrey Joseph Marrah , Thomas Joseph Kennelly , Michael John Easterwood , Linh Ngoc Pham , Ronald W Dale
IPC分类号： H03J1/00 , H04B1/18 , H04B1/00
CPC分类号： H03J1/0008 , H04B1/18
摘要： A technique for the automatic alignment and tuning of the front end of a vehicle radio. A tuning voltage is applied to a multiplying digital-to-analog converter before being applied to a front end tuning circuitry of the radio. A tuning voltage antenna number is applied to the tuning voltage at the converter to scale the tuning voltage, and adjust the center frequency tuning of the front end. During alignment, the tuning voltage antenna number is used to modulate the tuning voltage around a mean by reprogramming the tuning voltage antenna number a few values higher and lower in sequence. This modulation of the antenna tuning voltage creates an AC modulation component on the signal strength indicator signal passing through the front end. The signal strength indicator signal is measured and compared to its value before the tuning voltage antenna number was changed. If the signal strength indicator signal is higher for a higher tuning voltage antenna number, the front end is misaligned to the low side of the desired alignment point. Likewise, if the signal strength indicator signal is lower for an increasing tuning voltage antenna number, the front end is misaligned to the high side. If there is no change in the signal strength indicator signal for both increases and decreases in the tuning voltage antenna number, the front end is optimally aligned.
摘要翻译：一种用于车辆无线电的前端的自动对准和调谐的技术。在施加到无线电装置的前端调谐电路之前，将调谐电压施加到乘法数模转换器。调谐电压天线编号适用于转换器的调谐电压，以调整调谐电压，并调整前端的中心频率调谐。在对准期间，调谐电压天线数用于通过将调谐电压天线数量重新编程几个数值逐渐升高和降低来调制平均值周围的调谐电压。天线调谐电压的这种调制在通过前端的信号强度指示信号上产生AC调制分量。测量信号强度指示器信号，并将其与调谐电压天线编号改变前的值进行比较。如果对于较高的调谐电压天线编号，信号强度指示信号较高，则前端未对准所需对准点的低侧。同样地，如果对于增加的调谐电压天线号，信号强度指示信号较低，则前端不对准高端。如果在调谐电压天线编号中增加和减少的信号强度指示信号都没有变化，则前端是最佳对齐的。

3. 发明授权

US5920189A Auto ranging current monitor with common mode correction 失效
标题翻译：具有共模校正功能的自动测距电流监视器
公开(公告)号：US5920189A
公开(公告)日：1999-07-06
申请号：US756471
申请日：1996-11-26
申请人： R. Thomas Fisher , Ronald W Dale , Larry W Soutar
发明人： R. Thomas Fisher , Ronald W Dale , Larry W Soutar
IPC分类号： G01R15/09 , G01R19/00 , G01R21/06
CPC分类号： G01R15/09 , G01R19/0092
摘要： An improved current monitor for measuring current over a wide dynamic range. The current monitor includes a low current channel, a high current channel, and a switch for selecting the low current channel if the measured current is below a predetermined level and the high current channel if the current is above the predetermined level. The output of the high current channel is voltage encoded by adding a fixed offset. The current monitor determines that the measured current is from the low current channel if the reading is below the offset and from the high current channel if the reading is above the offset. A current level output device automatically outputs a decoded current reading based on this determination. The current monitor also incorporates a low current error compensation circuit to compensate for parasitic current when the current monitor is using the high current channel. The current monitor also incorporates a device for reducing the common mode error voltage to zero in the differential amplifiers used to convert current across shunt resistors in the low and high current channels to a voltage signal.
摘要翻译：一种改进的电流监测器，用于在宽动态范围内测量电流。电流监视器包括低电流通道，高电流通道，以及用于当测量电流低于预定电平时选择低电流通道的开关，如果电流高于预定电平，则该电流监视器包括高电流通道。高电流通道的输出通过添加固定偏移量进行电压编码。如果读数低于偏移量，并且读数高于偏移量，则当前显示器确定测量的电流来自低电流通道。电流输出装置根据该判定自动输出解码的电流读数。电流监视器还包含一个低电流误差补偿电路，用于补偿当前监视器使用高电流通道时的寄生电流。电流监视器还包括用于在用于将低通和高电流通道中的分流电阻器上的电流转换为电压信号的差分放大器中将共模误差电压降低到零的装置。

4. 发明授权

US5644495A Method and apparatus for wow and flutter analysis 失效
标题翻译：用于哇音和颤振分析的方法和装置
公开(公告)号：US5644495A
公开(公告)日：1997-07-01
申请号：US418356
申请日：1995-04-07
申请人： Larry W. Soutar , Ronald W. Dale
发明人： Larry W. Soutar , Ronald W. Dale
IPC分类号： G11B20/22
CPC分类号： G11B20/225
摘要： Wow and flutter of a tape player is measured by playing a recording of a constant frequency test tone, digitally sampling and storing each period of the tone over a test interval, subtracting the average period from each period to obtain deviation data, calculating the FFT of the deviation data, and then calculating power magnitude and wow and flutter. The apparatus includes an interface board which squares the signals from the player, and a desktop computer having a timing board for gating a counter for each square wave pulse to sample the periods, a memory for storing the samples, and a CPU programmed to analyze the samples according to the test method.
摘要翻译：通过播放恒定频率测试音的记录，在测试间隔内数字采样和存储音调的每个周期，从每个周期减去平均周期以获得偏差数据，计算FFT的FFT 偏差数据，然后计算功率幅度和哇和颤抖。该装置包括对来自播放器的信号进行平方的接口板和具有用于为每个方波脉冲选通计数器的定时板来采样周期的台式计算机，用于存储样本的存储器和被编程为分析样品按照试验方法。

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