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    2.
    发明专利
    未知

    公开(公告)号：FR2605477B1

    公开(公告)日：1994-02-25

    申请号：FR8714462

    申请日：1987-10-20

    Applicant: RCA CORP

    Inventor： JOHN JAMES GIBSON ,  TODD J CHRISTOPHER

    IPC: H03G7/00 ,  H03G5/04 ,  H03G9/02 ,  H04B1/62 ,  H04N7/08 ,  H04S1/00 ,  H04B1/66

    Abstract: A variable preemphasis/deemphasis network is disclosed which is coupled between audio input and output terminals. The network exhibits a family of transfer function response characteristics which vary between a full deemphasis characteristic H(f) and a full emphasis characteristic 1/H(f) in response to a control signal and exhibits complementary transfer function response characteristics in response to reciprocal valued control signals. The network includes a signal filter which determines the shape of the transfer function response characteristic, and a gain controlled amplifier which determines which one of the family of transfer function response characteristics is exhibited in response to the control signal.

    A SAMPLED DATA TONE CONTROL SYSTEM
    8.
    发明专利
    A SAMPLED DATA TONE CONTROL SYSTEM 未知

    公开(公告)号：ZA877198B

    公开(公告)日：1988-06-29

    申请号：ZA877198

    申请日：1987-09-24

    Applicant: RCA CORP

    Inventor： CHRISTOPHER TODD J ,  TODD J CHRISTOPHER

    IPC: H03G5/00 ,  H03G5/02 ,  H03H17/00 ,  H03H17/02 ,  H03H17/04 ,  H03H17/06 ,  H03G

    Abstract: A sampled data treble control system, requiring a single multiplier element (22), includes the cascade connection of a first adder (20), the multiplier (22), and a second adder (24) coupled between the system input and output terminals. A subtracter (32) develops the differences between the system input and output signals and applies them to an IIR filter (26,28,30). The filtered differences are scaled and coupled to the first (20) and second adders (24). The system transfer function H(Z) is given by H(Z) = [1+(Z-1)/(1+1/A)K]/[1+(Z-1)/(1+A)K] where A is a treble control variable applied to the multiplier (22), K is a scaling constant and Z is the conventional Z-transform variable.

    9.
    发明专利
    未知

    公开(公告)号：IT1134742B

    公开(公告)日：1986-08-13

    申请号：IT2668180

    申请日：1980-12-16

    Applicant: RCA CORP

    Inventor： MCGUFFIN WILLIAM GEORGE ,  TODD J CHRISTOPHER

    IPC: G11B21/04 ,  G11B3/085 ,  G11B3/38 ,  G11B9/06 ,  G11B19/14 ,  G11B

    Abstract: To provide control signals allowing compensation of stylus tracking in eccentric grooves of a video disc 10, a stylus 11 carries an electrode 13 disposed between first and second electrodes 14, 15 fixedly mounted on a motor driven carriage 8 to which stylus 11 is compliantly mounted. The capacitances of the variable capacitors thus formed vary with the displacement of electrode 13, and hence of stylus 11, relative to carriage 8. In Figure 1, complementary a.c. signals V1, V2 are applied to electrodes 14, 15 so that the algebraic sum of these signals capacitively coupled to electrode 13 is indicative of the position of the stylus. The output signal V3 from electrode 13, via processing circuit 29, controls a motor 31 to move carriage 8 so as to restore electrode 13, and thus the stylus 11, to a null position. In Figure 8 (not shown), an a.c. signal which has been amplitude modulated by voltage variable impedances is applied to the first and second electrodes whereby the time average of the signal summed at the stylus related electrode is indicative of the stylus position.

    10.
    发明专利
    未知

    公开(公告)号：DE3023852A1

    公开(公告)日：1981-01-22

    申请号：DE3023852

    申请日：1980-06-25

    Applicant: RCA CORP

    Inventor： WILBER JAMES ALBERT ,  TODD J CHRISTOPHER

    IPC: H03B5/32 ,  H03B5/02 ,  H03B5/36 ,  H03C3/42 ,  H03B1/04 ,  H03B5/30

    Abstract: An oscillator including a resonator having a primary feedback loop for causing oscillations to occur at a desired frequency and a secondary feedback loop including a multiplier for causing variations of said frequency in response to an input signal manifestation. Spectral purity is enhanced and potential overtone oscillations are suppressed by a cascade connection of lag networks in the primary loop which exhibit a low-pass transfer characteristic and provide at least pi radians of phase shift, one of the networks being shared in common with the secondary loop for supplying a quadrature signal to the multiplier.

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