知搜-全球专利检索

  1. Login
  2. Sign Up

Search Results

5 records (took 0.009 seconds)

    Sense, store and interlock matrix circuit for a switching device
    2.
    发明授权
    Sense, store and interlock matrix circuit for a switching device 失效
    用于切换设备的感知，存储和互锁矩阵电路

    公开(公告)号：US3582892A

    公开(公告)日：1971-06-01

    申请号：US3582892D

    申请日：1968-10-29

    Applicant: IBM

    Inventor： JULIUSBURGER HANS Y ,  STILWELL GEORGE R JR

    IPC: G06K15/10 ,  H03M11/02 ,  H04Q3/00

    CPC classification number: H03M11/02 ,  G06K15/10

    Abstract: A circuit is provided which operates in combination with a matrix switch. The circuit senses a switch closure, stores a pair of output signals representative of the closed switch, cancels the effect of a second switch closure or multiple switch closure during the storage period and resets at the end of the storage period. The circuit includes a plurality of transistor latching means connected to the matrix switch, pairs of which are set by switch closures. Clamping diodes are provided to balance the latching means to prevent spontaneous setting. A switch interlock transistor is included to prevent any subsequent switch closures prior to reset from producing an output signal. A transistor arrangement is also included to cancel the output signals when two or more switches are erroneously closed at the same time. At the end of a selected time period, reset transistors are actuated to reset the circuit to its original state.

    Alphanumeric parallel tone, sequential character system, method, and apparatus
    4.
    发明授权
    Alphanumeric parallel tone, sequential character system, method, and apparatus 失效
    ALPHANUMER PARALLEL TONE，顺序字符系统，方法和装置

    公开(公告)号：US3582895A

    公开(公告)日：1971-06-01

    申请号：US3582895D

    申请日：1969-01-15

    Applicant: IBM

    Inventor： ABRAMSON PAUL ,  STILWELL GEORGE R JR

    IPC: H04M11/06 ,  H04L27/26 ,  H04L27/30 ,  H04M11/00 ,  H04Q1/45 ,  H04Q9/00

    CPC classification number: H04L27/30

    Abstract: An alphanumeric system, method, and apparatus includes a parallel tone transmitter, a parallel tone receiver, each having a conventional telephone frequency type of A and B or parallel tone oscillators, and a splitter of tones from the receiver. An A tone will last for an interval long enough to assure protection against response to spurious tones such as voice signals, but may change frequency during the character period. When the A tone is constant during a complete character period, the B tone will not last as long as the A tone, but will change frequency after a set interval, for an A-B-B sequential, alphanumeric code, during the character period for each character. Alternatively, both the A and B tones are changed to provide an A-A-B-B sequential code for each character. The audio tones employed are standard, avoid intermodulation error, and the system maintains voice protection, while increasing the number of alphanumeric characters for a period of fixed length.

Patent Agency Ranking