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    Analog to digital encoder
    21.
    发明授权
    Analog to digital encoder 失效
    模拟到数字编码器

    公开(公告)号：US3634856A

    公开(公告)日：1972-01-11

    申请号：US3634856D

    申请日：1969-10-15

    Applicant: ERICSSON TELEFON AB L M

    Inventor： KARLSSON STIG ERIK

    IPC: H03M1/00 ,  H03K13/04

    CPC classification number: H03M1/44

    Abstract: An analog to digital encoder obtains the binary digits from successive comparisons between the analog signal and reference signals obtained from different combinations of a number of reference signal sources activated by means of setting appertaining flip-flops. The setting of the desired flip-flops is controlled by logical circuits interconnecting the flip-flops. By means of these logical circuits the shift register normally required in this type of coder can be eliminated.

    Abstract translation: 模拟数字编码器从通过设置触发器激活的多个参考信号源的不同组合获得的模拟信号和参考信号之间的连续比较中获得二进制数字。 所需触发器的设置由互连触发器的逻辑电路来控制。 通过这些逻辑电路，可以消除这种类型的编码器通常需要的移位寄存器。

    Arrangement at a called subscriber{3 s instrument for indicating the calling instrument
    22.
    发明授权
    Arrangement at a called subscriber{3 s instrument for indicating the calling instrument 失效
    指示用户指示器（3）用于显示呼叫仪器的仪器

    公开(公告)号：US3604854A

    公开(公告)日：1971-09-14

    申请号：US3604854D

    申请日：1969-11-10

    Applicant: ERICSSON TELEFON AB L M

    Inventor： JACOBAEUS ANTON CHRISTIAN ,  BJORK JOHN CARL HAROLD

    IPC: H04M3/44 ,  H04Q3/42 ,  H04M15/06

    CPC classification number: H04Q3/42 ,  H04M3/44

    Abstract: In an automatic telephone exchange certain subscribers can use short numbers instead of the directory numbers for calls to optionally selected extensions which often are called from the subscriber. The invention has for a purpose to indicate at the called subscriber''s instrument who is calling or has called with the use of a short number. A registering means for short numbers is arranged at the subscriber''s instrument. In the exchange identifying means and analyzer are arranged so that on one hand the identity of the called extension corresponding to a short number is indicated for connecting a telephone communication, on the other hand the short number of the calling subscriber valid at the called part is indicated for setting the registering means of the called subscriber''s instrument.

    Apparatus for synchronizing a pcm-receiver and a transmitter
    23.
    发明授权
    Apparatus for synchronizing a pcm-receiver and a transmitter 失效
    用于同步PCM接收器和发送器的装置

    公开(公告)号：US3597547A

    公开(公告)日：1971-08-03

    申请号：US3597547D

    申请日：1969-02-06

    Applicant: ERICSSON TELEFON AB L M

    Inventor： ROLL JOHAN NILS

    IPC: H04J3/06

    CPC classification number: H04J3/0605

    Abstract: A method for synchronizing the receiver and the transmitter in a PCM-receiver system wherein binary information is transmitted within cyclically occurring channels. The last bit of each of the channels form a synchronization pattern, which is regular but has at least one irregularity which occurs within a predetermined channel. By first using the regular part of the synchronization pattern for synchronizing the bit distributors of the transmitter and the receiver and then the irregularity for synchronizing the channel distributors a very fast two stage synchronization process is obtained.

    Circuit arrangement for reproducing a tolerance range on a cathode-ray indicator
    25.
    发明授权
    Circuit arrangement for reproducing a tolerance range on a cathode-ray indicator 失效
    用于在阴极射线指示器上重现宽容范围的电路布置

    公开(公告)号：US3582773A

    公开(公告)日：1971-06-01

    申请号：US3582773D

    申请日：1968-10-30

    Applicant: ERICSSON TELEFON AB L M

    Inventor： KARL HENIZ GEORG

    IPC: G01R13/20 ,  G07C3/14 ,  G09G1/14 ,  G01N27/00

    CPC classification number: G01R13/208 ,  G07C3/14 ,  G09G1/143

    Abstract: A circuit arrangement provides for the generation of horizontal and vertical line segments related to voltage levels and frequencies, respectively, on a cathode-ray indicator to indicate the tolerance range of the transfer characteristic of a frequency sensitive measuring device. The device receives a sweep frequency signal from a sweep frequency generator. The sweep frequency generator in conjunction with a sawtooth generator is used by circuitry which performs level comparisons at particular frequencies on the output signal of the measuring device to provide intensity modulating pulses that are fed to the cathoderay indicator.

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