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    Sliding scale predictive coding system
    6.
    发明授权
    Sliding scale predictive coding system 失效
    滑动尺度预测编码系统

    公开(公告)号：US3568063A

    公开(公告)日：1971-03-02

    申请号：US3568063D

    申请日：1969-04-02

    Applicant: BELL TELEPHONE LABOR INC

    Inventor： BROWN EARL F

    IPC: H04N7/26 ,  H04B1/00 ,  H04B7/00

    CPC classification number: H04N19/30

    Abstract: A sliding scale coding system is disclosed which effectively extends the range of the quantizing circuit in a predictive coder by automatically inserting extra samples when changes in the input signal exceed a predetermined level. The extra samples are quantized and transmitted in succession with the regular samples. At the receiver the extra samples are detected and reconstructed in proper order with the regular samples. Filter circuits then add the extra samples to the regular samples in order to reconstruct the original input signal.

    Sign prediction coding for pulse code communication systems
    8.
    发明授权
    Sign prediction coding for pulse code communication systems 失效
    脉冲代码通信系统的标志预测编码

    公开(公告)号：US3593141A

    公开(公告)日：1971-07-13

    申请号：US3593141D

    申请日：1969-09-26

    Applicant: BELL TELEPHONE LABOR INC

    Inventor： BROWN EARL F ,  KAMINSKI WILLIAM ,  LIMB JOHN O ,  MOUNTS FRANK W

    IPC: H03M3/04 ,  H04B14/06 ,  H04L25/48 ,  H04B1/00

    CPC classification number: H03M3/04

    Abstract: A differential pulse code communication system is disclosed with sign prediction coding which reduces the number of digits required to describe the levels produced in the quantization of the differential signal. In the system the sign of the largest positive and negative levels of the quantizer are predicted by assuming that they have the same sign as the previous level. If the prediction is wrong a lower level with the correct sign is transmitted rather than the level with the predicted sign. Because of the prediction, additional levels may be added in the quantizer in the space otherwise reserved for the signs predicted without increasing the pulse rate of the system.

    Redundancy reduction system for use with a signal having frame intervals
    9.
    发明授权
    Redundancy reduction system for use with a signal having frame intervals 失效
    用于具有框架间隔的信号的冗余减少系统

    公开(公告)号：US3582546A

    公开(公告)日：1971-06-01

    申请号：US3582546D

    申请日：1969-06-13

    Applicant: BELL TELEPHONE LABOR INC

    Inventor： BROWN EARL F

    IPC: H04N7/32 ,  H04N7/36 ,  H04N7/12

    CPC classification number: H04N19/152 ,  H04N19/50 ,  H04N19/503

    Abstract: A redundancy reduction system is described in which plural amplitude samples of a video signal are taken during each frame interval. The amplitude values for each set of four samples are coupled to the input of a circuit which operates in accordance with a fixed function to produce an indicator word for that set. The indicator words thereby generated for an entire frame interval are stored in a frame memory at positions in the memory corresponding to their respective set positions within the frame interval. In succeeding frames a similarly generated indicator word for a set of samples is compared with its corresponding stored indicator word from the frame memory. Only if a difference exists between the two indicator words is the set of new amplitude samples transmitted to a receiving location.

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