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18 条记录 (耗时 0.013 秒)

    Means and method of enhancing signal resolution and dynamic range extension in a pulse width modulation amplifier
    2.
    发明授权
    Means and method of enhancing signal resolution and dynamic range extension in a pulse width modulation amplifier 失效
    在脉冲宽度调制放大器中增强信号分辨率和动态范围扩展的手段和方法

    公开(公告)号：US5422597A

    公开(公告)日：1995-06-06

    申请号：US251227

    申请日：1994-05-31

    申请人： Robert E. Stengel ,  David L. Muri ,  Enrique Ferrer

    发明人： Robert E. Stengel ,  David L. Muri ,  Enrique Ferrer

    IPC分类号： H03F3/217 ,  H03F3/38

    CPC分类号： H03F3/2173

    摘要： An amplifier (1) used with a pulse width modulated signal which improves the efficiency of a low level input signal comprises two or more switching devices (7,9) with common source/drain or emitter/collector connections. The gates or the bases of the devices are independently driven to optimize the efficiency of the various Rds (on) resistance values of the transistors (61, 63, 65, 89, 91, 93) used in the devices. The amplifier is operated so that during the highest output levels, select switching devices (61, 63, 65) are utilized to reduce in series resistance with the load (13). As output power decreases, devices (89, 91, 93) with higher Rds (on) resistance values are activated by a control signal which greatly improves DC to DC conversion efficiency with improved output voltage resolution, dynamic range and reduced electromagnetic interference potential.

    摘要翻译： 与改善低电平输入信号的效率的脉冲宽度调制信号一起使用的放大器（1）包括具有公共源极/漏极或发射极/集电极连接的两个或多个开关器件（7,9）。 独立地驱动器件的栅极或基极以优化器件中使用的晶体管（61,63,65,89,91,93）的各种Rds（导通）电阻值的效率。 放大器的工作原理是，在最高的输出电平下，选择开关器件（61,63,65）来减少负载（13）的串联电阻。 随着输出功率的降低，具有较高Rds（on）电阻值的器件（89,91,93）由控制信号激活，通过改进的输出电压分辨率，动态范围和降低的电磁干扰电位，极大地提高了DC至DC转换效率。

    Pulsewidth-modulated amplifier having analog mode
    3.
    发明授权
    Pulsewidth-modulated amplifier having analog mode 失效
    具有模拟模式的脉宽调制放大器

    公开(公告)号：US5382915A

    公开(公告)日：1995-01-17

    申请号：US85900

    申请日：1993-07-06

    申请人： David L. Muri ,  Robert E. Stengel

    发明人： David L. Muri ,  Robert E. Stengel

    IPC分类号： H03F3/217 ,  H03K11/00 ,  H03C7/00 ,  H03K7/00

    CPC分类号： H03F3/2171

    摘要： An audio amplifier (100) switches between a pulsewidth-modulated (PWM) mode to an analog mode when required in order to reduce unwanted EMI when the signals being reproduced fall within a predetermined threshold range such as when reproducing low amplitude signals. Amplifier (100) includes both a pulsewidth-modulator (114) and a low-level analog amplifier (126) coupled to a speaker bridge circuit. When controller (106) determines that the input signal (102) is at a predetermined level, controller (106) selectively applies to the load (164) an analog signal instead of the PWM signal, this provides for improved dynamic range and reduced amplifier produced EMI.

    摘要翻译： 当需要时，音频放大器（100）在脉冲宽度调制（PWM）模式到模拟模式之间切换，以便当再现的信号落在诸如当再现低振幅信号的预定阈值范围内时，减少不必要的EMI。 放大器（100）包括耦合到扬声器电桥电路的脉宽调制器（114）和低电平模拟放大器（126）。 当控制器（106）确定输入信号（102）处于预定电平时，控制器（106）选择性地向负载（164）施加模拟信号而不是PWM信号，这提供了改进的动态范围和减小的放大器产生 EMI。

    Communication device with time assigned duplex operation
    4.
    发明授权
    Communication device with time assigned duplex operation 失效
    具有时间分配双工操作的通信设备

    公开(公告)号：US5379279A

    公开(公告)日：1995-01-03

    申请号：US86071

    申请日：1993-07-06

    申请人： Charles A. Backof ,  David L. Muri

    发明人： Charles A. Backof ,  David L. Muri

    IPC分类号： H04B1/48 ,  H04B1/56

    CPC分类号： H04B1/56 ,  H04B1/48

    摘要： The communication device (100) operates in full duplex mode by allowing its transmitter (106) to periodically interrupt transmission to allow for a second communication device (702) to send its request-to-transmit signal. This signal is received by the receiver (108) and coupled to a controller (110). The controller (110) dynamically reduces the rate at which it codes the voice in response to the activity on the channel. The coded signal is then coupled to the transmitter (108) for transmission. A sync and control header is included at the beginning of each transmission to allow the two communication devices (100 and 702) to remain in sync and to be aware of the coding rate each of the communication devices (100 and 702) has employed in its most recent transmission. With the two communication devices (100 and 702) operating at dynamically adjusted voice coding rates, each occupies the channel for a portion of time in each frame commensurate with the information flow, thereby providing for full duplex operation.

    摘要翻译： 通信设备（100）通过允许其发射机（106）周期性地中断传输以允许第二通信设备（702）发送其请求发送信号来以全双工模式操作。 该信号由接收器（108）接收并耦合到控制器（110）。 响应于信道上的活动，控制器（110）动态地降低其对语音进行编码的速率。 编码信号然后被耦合到发射机（108）以进行传输。 在每个传输的开始处包括同步和控制报头，以允许两个通信设备（100和702）保持同步，并且知道每个通信设备（100和702）在其中使用的编码率 最近的传输。 利用两个通信设备（100和702）以动态调整的语音编码速率操作，每个通信设备在每个帧中占据与该信息流相称的一部分时间的信道，从而提供全双工操作。

    Distortion compensation for a pulsewidth-modulated circuit
    5.
    发明授权
    Distortion compensation for a pulsewidth-modulated circuit 失效
    脉宽调制电路的失真补偿

    公开(公告)号：US5438694A

    公开(公告)日：1995-08-01

    申请号：US103374

    申请日：1993-08-09

    申请人： David L. Muri ,  Robert E. Stengel

    发明人： David L. Muri ,  Robert E. Stengel

    IPC分类号： H03F3/217 ,  H03F3/38

    CPC分类号： H03F3/2173

    摘要： Pulsewidth-modulated amplifier (100) includes a controller (102) which provides for a set of compensated signals (114, 158 and 160). The compensated signals are used for driving a speaker (136). Controller (100) includes a storage area for storing distortion characteristics for the amplifier for a predetermined operational frequency range. The compensated drive signals (114, 158 and 160) help compensate for the electrical non-linear distortions that occur in amplifier (100) and thereby help reduce the output distortion of amplifier (100).

    摘要翻译： 脉宽调制放大器（100）包括提供一组补偿信号（114,158和160）的控制器（102）。 补偿信号用于驱动扬声器（136）。 控制器（100）包括用于在预定操作频率范围内存储用于放大器的失真特性的存储区域。 经补偿的驱动信号（114,158和160）有助于补偿放大器（100）中发生的电非线性失真，从而有助于减小放大器（100）的输出失真。

    Apparatus and method for suppressing side lobe response in a digitally sampled system
    6.
    发明授权
    Apparatus and method for suppressing side lobe response in a digitally sampled system 失效
    用于在数字采样系统中抑制旁瓣响应的装置和方法

    公开(公告)号：US4513385A

    公开(公告)日：1985-04-23

    申请号：US462494

    申请日：1983-01-31

    申请人： David L. Muri

    发明人： David L. Muri

    IPC分类号： H03H17/00 ,  G01R23/16 ,  G06F17/10 ,  G06F17/14 ,  H01Q3/26 ,  H04B20060101 ,  H04B1/06 ,  H04L27/00 ,  H04L27/26 ,  G06F3/05

    CPC分类号： H01Q3/2605 ,  Y10S367/905

    摘要： A decoder circuit is provided which employs digital sampling and correlation apparatus to detect the presence of a received tone signal exhibiting a predetermined frequency. Samples of received tone signals are taken and, in effect, multiplied by a substantially rectangular observation window which includes a bite interval of selected duration and location therein. A correlator correlates the windowed samples to detect samples corresponding to the predetermined frequency (main lobe frequency). A significant decrease in undesired side lobe response is thus achieved.

    摘要翻译： 提供了一种解码器电路，其采用数字采样和相关装置来检测呈现出预定频率的接收音调信号的存在。 接收到的音调信号的样本被实际上乘以基本上矩形的观察窗，其包括选定的持续时间和位置的咬合间隔。 相关器将窗口样本相关联以检测对应于预定频率（主瓣频率）的样本。 因此实现了不期望的旁瓣响应的显着降低。

    Modulator with baseband to phase converter
    7.
    发明授权
    Modulator with baseband to phase converter 失效
    具有基带到相位转换器的调制器

    公开(公告)号：US5881112A

    公开(公告)日：1999-03-09

    申请号：US551970

    申请日：1995-11-02

    申请人： David L. Muri ,  Charles A. Backof, Jr.

    发明人： David L. Muri ,  Charles A. Backof, Jr.

    IPC分类号： H04L27/233 ,  H04L27/22

    CPC分类号： H04L27/2332

    摘要： A phase demodulator (101) is used for sensing the phase.sub.-- angle of a phasor represented by the I and Q signals by first producing the analog I and Q signals in a direct conversion receiver (104). A phase generator (106) is used to approximate the angle of the phasor as represented by the I and Q signals by scaling and comparing the magnitudes of the I and Q signals and making decisions based on their relative magnitudes. The scaling includes successive alteration of the magnitude of the I and Q signals.sub.-- depending on their relative magnitudes. A DSP (108) is used to receive this bit stream representation (302) of the phasor and recover the information signal.

    摘要翻译： 相位解调器（101）用于通过在直接转换接收器（104）中首先产生模拟I和Q信号来感测由I和Q信号表示的相量的相位角。 相位发生器（106）用于通过缩放和比较I和Q信号的幅度并根据它们的相对幅度做出决定来近似由I和Q信号表示的相量的角度。 缩放包括I和Q信号的幅度的连续变化 - 取决于它们的相对幅度。 DSP（108）用于接收相量的该比特流表示（302）并恢复信息信号。

    Microprocessor tone synthesizer with reduced quantization error
    8.
    发明授权
    Microprocessor tone synthesizer with reduced quantization error 失效
    具有减少量化误差的微处理器色调合成器

    公开(公告)号：US4213185A

    公开(公告)日：1980-07-15

    申请号：US943037

    申请日：1978-09-18

    申请人： David L. Muri ,  James T. Doyle

    发明人： David L. Muri ,  James T. Doyle

    IPC分类号： G06F1/02 ,  H03B19/00 ,  H04W88/18

    CPC分类号： H04W88/188 ,  G06F1/022 ,  H03B19/00

    摘要： The accuracy of a required tone set, digitally synthesized by a microprocessor, is improved beyond the theoretical limit of the microprocessor circuitry by producing each tone at a frequency which is a sub-multiple of the desired frequency, then multiplying to provide the desired frequency. With the addition of a multiplier such as a doubler, a better choice of oscillator frequency becomes possible which further increases the tone frequency accuracy. The microprocessor can also reduce the start up time and the time between tones, eliminating delays in transmitting a series of coded tones.

    摘要翻译： 由微处理器进行数字合成的所需色调集的精度通过以所需频率的倍数产生每个色调，然后相乘以提供所需频率，从而超出了微处理器电路的理论限制。 通过增加诸如倍频器的乘法器，可以更好地选择振荡器频率，这进一步提高了音频精度。 微处理器还可以减少启动时间和音调之间的时间，消除传输一系列编码音的延迟。