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1. 发明专利

DK38682A 未知
公开(公告)号：DK38682A
公开(公告)日：1982-07-30
申请号：DK38682
申请日：1982-01-28
申请人： RCA CORP
发明人： DIETERICH C B , CHRISTOPHER T J , MEHROTRA G N
IPC分类号： H03G7/00 , H04B
摘要： In a signal expander, the envelope of an input signal (S1) to be expanded is detected (30) and applied as a control signal (S3) to the gain control input (18) of a variable gain device (14) which expands the input signal. The control signal is applied to the variable gain device via an adaptive filter (40) having improved ripple reduction and transient performance characteristics to minimize audibility of gain changes. The adaptive filter includes a low pass filter (50,52) for producing a smoothed control signal essentially free of ripple and an analog gate (70,74,78) for coupling the greater of the smoothed signal or a further signal to the variable gain device, the further signal being equal to the detector output signal less a constant. Compression of an input signal is provided by applying the input signal to the non-inverting input (110) fig 3 not shown of an amplifier (100) and feeding the (compressed) output signal (S1) of the amplifier to the expander (30,40, 14) and feeding the output signal (S2) of the expander to the inverting input of the amplifier (100).

2. 发明专利

AU6752381A PCM SYNCHRONOUS DETECTOR 未知
公开(公告)号：AU6752381A
公开(公告)日：1981-09-03
申请号：AU6752381
申请日：1981-02-20
申请人： RCA CORP
发明人： CHRISTOPHER T J , DIETERICH C B
IPC分类号： H04L25/06 , H04N9/82 , H04N9/85 , H04N9/87 , H04N9/50 , H04N9/491

3. 发明专利

DK429980A 未知
公开(公告)号：DK429980A
公开(公告)日：1981-04-13
申请号：DK429980
申请日：1980-10-10
申请人： RCA CORP
发明人： DIETERICH C B , CHRISTOPHER T J
IPC分类号： G11B5/09 , G11B20/10 , G11B20/18 , G11B27/10 , G11B27/30 , G11B27/34 , H04N5/76 , H04N5/92 , H04N9/79 , H04N9/82 , G11B
摘要： In a video disc system wherein each data field includes, as well as a video signal, a predetermined digital start code followed by a digital error code and digital information bits, the error code is a polynomial division code chosen so that for each data field an error code remainder register in the video disc player initially contains the predetermined start code rather than zero, and/or, if no errors are detected, finally contains the predetermined start code rather than zero. An arrangement is also described which, in response to the reading of a particular sequence of data from the disc indicating the end of the record, disables the read head.

4. 发明专利

AU6004780A STYLUS POSITION SENSING APPARATUS FOR A VIDEO DISC PLAYER 未知
公开(公告)号：AU6004780A
公开(公告)日：1981-01-15
申请号：AU6004780
申请日：1980-07-02
申请人： RCA CORP
发明人： TAYLOR B K , CHRISTOPHER T J
IPC分类号： G11B9/06 , G11B21/04 , G11B21/06 , G11B3/80 , G11B3/46 , G11B19/14

5. 发明专利

BE770630A 未知
公开(公告)号：BE770630A
公开(公告)日：1971-12-01
申请号：BE770630
申请日：1971-07-28
申请人： RCA CORP
发明人： CHRISTOPHER T J
IPC分类号： H03K3/0231 , H03K4/06 , H03K4/501 , H04N
摘要： 1360626 Transistor oscillators; automatic frequency control RCA CORPORATION 16 July 1971 [31 July 1970] 33530/71 Headings H3A and H3T A frequency controlled oscillator comprises a bistable circuit 72, 73 feeding an integrator 77, 78, 79, the output from the integrator being fed back to provide set and reset signals for the bi-stable via a threshold arrangement 71 which provides a reset signal when the integrator output level is equal to a reference level, and a set signal when the integrator output is equal to the frequency control voltage level. When capacitor 77 is discharged, transistor 71 is off, and cross-coupled transistors 72, 73 are on. When capacitor 77 has charged to a first predetermined threshold, transistor 77 conducts and transistors 72, 73 turn off. Capacitor 77 now discharges to a lower threshold at which 71 turns off and 72, 73 turn on. The turn on point of 72 is varied by a transistor 74 to which a control voltage is applied. The arrangement is used in a television timebase synchronizing, the control signal being derived from a phase comparator 46, 48 which compares the received sync. signal and the oscillator signal.

6. 发明专利

SE8505840L 未知
公开(公告)号：SE8505840L
公开(公告)日：1986-06-20
申请号：SE8505840
申请日：1985-12-10
申请人： RCA CORP
发明人： CHRISTOPHER T J
IPC分类号： H03H17/00 , H03H17/08 , H03H17/06
摘要： A digital input signal to be delayed is applied to a two-point linear interpolation filter which imparts delay to the signal proportional to the value of a delay control signal. Errors in both the amplitude and the phase of the delayed signal are minimized by the addition of a correction signal to the delayed signal. The correction signal is provided by applying the input signal to a further filter and a multiplier connected in cascade. The further filter is a linear phase filter having a response zero at zero frequency and a delay equal to an add multiple of one-half of the sampling period, Ts, of the digital input signal. The multiplier is controlled so as to vary the amplitude of the compensating signal as a non-linear function of the delay control signal so as to provide maximum amplitude compensation at delays corresponding to odd multiples of Ts/2 and zero amplitude compensation at delays equal to integer multiples of Ts.

7. 发明专利

SE8006983L 未知
公开(公告)号：SE8006983L
公开(公告)日：1981-04-13
申请号：SE8006983
申请日：1980-10-06
申请人： RCA CORP
发明人： DIETERICH C B , CHRISTOPHER T J
IPC分类号： G11B5/09 , G11B20/10 , G11B20/18 , G11B27/10 , G11B27/30 , G11B27/34 , H04N5/76 , H04N5/92 , H04N9/79 , H04N9/82 , G11B27/00
摘要： In a video disc system wherein each data field includes, as well as a video signal, a predetermined digital start code followed by a digital error code and digital information bits, the error code is a polynomial division code chosen so that for each data field an error code remainder register in the video disc player initially contains the predetermined start code rather than zero, and/or, if no errors are detected, finally contains the predetermined start code rather than zero. An arrangement is also described which, in response to the reading of a particular sequence of data from the disc indicating the end of the record, disables the read head.

8. 发明专利

DK430180A 未知
公开(公告)号：DK430180A
公开(公告)日：1981-04-13
申请号：DK430180
申请日：1980-10-10
申请人： RCA CORP
发明人： CHRISTOPHER T J , DIETERICH C B
IPC分类号： H04N5/91 , G11B5/02 , G11B9/06 , G11B27/10 , G11B27/30 , G11B27/36 , H04N9/44 , H04N9/77 , H04N9/82 , H04N9/87 , G11B
摘要： Digital data is recorded as luminance level in synchronism with the colour subcarrier signal in one horizontal line period adjacent a constant (black) luminance line within the vertical banking interval between adjacent fields of video information on a video disc. The arrangement facilitates separation of the digital information by generating a difference signal between the data line and the black line using the comb filter already provided in the system. The digital data represents field number and type of program content and is used by a microprocessor controller to provide player features such as locked groove detection, program elapsed time display, and end of program indication.

9. 发明专利

SE7907946A 未知
公开(公告)号：SE7907946A
公开(公告)日：1980-04-03
申请号：SE7907946
申请日：1979-09-25
申请人： RCA CORP
发明人： CHRISTOPHER T J , LIN T H
IPC分类号： H04N5/781 , G01R31/00 , G11B3/00 , G11B7/00 , G11B7/004 , G11B9/06 , G11B20/06 , G11B27/10 , H03D3/24 , H03G3/34 , H04N5/91 , H04N5/94 , H04N9/882 , H04N5/76
CPC分类号： H03D3/241 , G01R31/00 , G11B3/00 , G11B7/00 , G11B9/06 , G11B27/105 , H03G3/345 , H04N9/882

10. 发明专利

NZ222286A BASS TONE CONTROL FOR SAMPLED DATA SIGNAL USES ONLY ONE MULTIPLIER 未知
公开(公告)号：NZ222286A
公开(公告)日：1989-04-26
申请号：NZ22228687
申请日：1987-10-23
申请人： RCA CORP
发明人： CHRISTOPHER T J
IPC分类号： H03G5/00 , H03H17/04
摘要： A sampled data tone control system, applicable for providing audio bass cut and boost control, includes a single variable multiplying circuit (14) for determining the system variable response characteristics. Input samples are coupled to the multiplier which has its output connected to an integrator (18,20). The integrated samples are scaled by a constant and combined with the input samples to provide tone controlled signal.

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