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公开(公告)号：EP0441492A2
公开(公告)日：1991-08-14
申请号：EP91300440.4
申请日：1991-01-21
IPC分类号： G08C23/00
摘要： Organ pedal switches (14) have states determined by the position of the pedals. These switch states are sensed in a peripheral unit (12) through a switch matrix that generates a transmission signal provided by a serially encoded data stream having a sync pulse. Power to the peripheral unit, which is physically isolated from a host unit (16), is provided through magnetically coupled respective primary (34) and secondary (20) windings. Further, clock signals for the peripheral and host units are provided by a power oscillator (30) that drives the primary or tank coil of the oscillator in the host unit. Thus, power and clock signals are transmitted via the coupled windings from the host unit to the peripheral unit and data in one embodiment is relayed back to the host unit through infrared emissions. Alternatively, data is transferred bach through the coupled coils by loading the power oscillating circuit of the host unit during generation of data pulses by the data encoder (26) of the peripheral unit. The host unit then detects the transmitted data, determines whether it is different from previously received data for the same switch, and transfers to a CPU (18) only data that is new. The host unit stores an image of the data stream corresponding to an image stored in the CPU. The clock frequency derived from the power oscillator in the host unit is independent of the frequency of operation of the CPU.
摘要翻译： 器官踏板开关（14）具有由踏板的位置确定的状态。 这些开关状态通过开关矩阵在外围单元（12）中感测，该开关矩阵产生由具有同步脉冲的串行编码数据流提供的发送信号。 通过磁耦合的相应的初级（34）和次级（20）绕组提供与主机单元（16）物理隔离的外围单元的功率。 此外，用于外围设备和主机单元的时钟信号由驱动主机单元中的振荡器的主线圈或槽线圈的功率振荡器（30）提供。 因此，功率和时钟信号经由耦合的绕组从主机单元发送到外围单元，并且在一个实施例中的数据通过红外发射被中继回主机单元。 或者，通过在外围单元的数据编码器（26）产生数据脉冲期间加载主机单元的功率振荡电路，数据通过耦合线圈传输。 主机单元然后检测所发送的数据，确定它是否与先前接收到的相同交换机的数据不同，并且只传送新的数据到CPU（18）。 主机单元存储与存储在CPU中的图像相对应的数据流的图像。 从主机单元的功率振荡器得到的时钟频率与CPU的运行频率无关。
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