公开(公告)号：GB2103055B

公开(公告)日：1985-03-20

申请号：GB8213085

申请日：1982-05-06

Applicant: RCA CORP

Inventor： GRIFFIS PATRICK DOUGLAS

IPC: H04S1/00 ,  H04S5/00

公开(公告)号：FR2532502A1

公开(公告)日：1984-03-02

申请号：FR8313926

申请日：1983-08-30

Applicant: RCA CORP

Inventor： RINDAL ABRAHAM E ,  GRIFFIS PATRICK DOUGLAS

IPC: H04N5/60 ,  H04N7/00 ,  H04S1/00

Abstract: A phase-locked loop (53) is provided for detecting the audio information from a television signal. A voltage controllable oscillator (VCO) (50) having a nominal oscillation frequency equal to the frequency difference between the intermediate frequency (IF) picture and sound carriers provides one input to a mixer (44) and a substantially unmodulated picture carrier is supplied as the other input to the mixer (44), which thereby provides a frequency translated output signal. A phase detector (48) has as its first input the output signal from the mixer (44) and as its second input the frequency modulated sound carrier. A lowpass filter (52) coupled between the output of the phase detector (48) and a control input to the VCO (50) completes the PLL. The detected audio information is provided at the output of the lowpass filter (52). The PLL can provide, according to another embodiment, a defect control signal which, when applied to compensation circuitry, reduces impulse noise effects in the video information.

公开(公告)号：GB2129241B

公开(公告)日：1986-01-02

申请号：GB8328684

申请日：1983-10-27

Applicant: RCA CORP

Inventor： GRIFFIS PATRICK DOUGLAS ,  RINDAL ABRAHAM E

IPC: H03D3/02 ,  H04N5/60 ,  H04N5/62

Abstract: A frequency translation phase-locked loop (PLL) is provided for detecting the audio information from a received television signal. The PLL includes a switching arrangement which, in a first position causes the loop to process the IF picture and sound carriers for detecting the audio information in an intercarrier type of detection method and, in a second position causes the loop to process the IF sound carrier for detecting the audio information without the use of the received picture carrier, in a "separate" (split-sound) type of audio detection method.

公开(公告)号：DE3217230A1

公开(公告)日：1982-11-25

申请号：DE3217230

申请日：1982-05-07

Applicant: RCA CORP

Inventor： GRIFFIS PATRICK DOUGLAS

IPC: H04S1/00 ,  H04S5/00

公开(公告)号：FR2505595A1

公开(公告)日：1982-11-12

申请号：FR8207896

申请日：1982-05-06

Applicant: RCA CORP

Inventor： GRIFFIS PATRICK DOUGLAS

IPC: H03G3/02 ,  H03G3/04 ,  H03G3/10 ,  H04S7/00 ,  H04B3/04

Abstract: First and second sound channels are provided for processing audio signals. Each sound channel includes means responsive to a D.C. control voltage for controlling the volume of the audio output signal of the channel. A volume control potentiometer is coupled across two terminals of a source of supply voltage and a D.C. volume control potential is developed at a tap of the potentiometer. The volume control potential is applied to a control electrode of a controlled current path. The controlled current path includes the parallel combination of a first voltage divider and a second, variable voltage divider. A tap of the first voltage divider is coupled to the D.C. control input of the first sound channel, and a tap of the second voltage divider is coupled to the D.C. control input of the second sound channel. By adjusting the second, variable voltage divider, the control voltage provided by the second voltage divider may be set to equalize the D.C. volume control characteristics of the two sound channels.

公开(公告)号：FR2505534A1

公开(公告)日：1982-11-12

申请号：FR8208002

申请日：1982-05-07

Applicant: RCA CORP

Inventor： GRIFFIS PATRICK DOUGLAS

IPC: H04S1/00 ,  H04S5/00 ,  G10L1/10

公开(公告)号：FR2505534B1

公开(公告)日：1986-02-21

申请号：FR8208002

申请日：1982-05-07

Applicant: RCA CORP

Inventor： GRIFFIS PATRICK DOUGLAS

IPC: H04S1/00 ,  H04S5/00

公开(公告)号：GB2100958B

公开(公告)日：1984-11-28

申请号：GB8213086

申请日：1982-05-06

Applicant: RCA CORP

Inventor： GRIFFIS PATRICK DOUGLAS

IPC: H03G3/02 ,  H03G3/04 ,  H03G3/10 ,  H04S7/00

Abstract: First and second sound channels are provided for processing audio signals. Each sound channel includes means responsive to a D.C. control voltage for controlling the volume of the audio output signal of the channel. A volume control potentiometer is coupled across two terminals of a source of supply voltage and a D.C. volume control potential is developed at a tap of the potentiometer. The volume control potential is applied to a control electrode of a controlled current path. The controlled current path includes the parallel combination of a first voltage divider and a second, variable voltage divider. A tap of the first voltage divider is coupled to the D.C. control input of the first sound channel, and a tap of the second voltage divider is coupled to the D.C. control input of the second sound channel. By adjusting the second, variable voltage divider, the control voltage provided by the second voltage divider may be set to equalize the D.C. volume control characteristics of the two sound channels.

公开(公告)号：GB2129241A

公开(公告)日：1984-05-10

申请号：GB8328684

申请日：1983-10-27

Applicant: RCA CORP

Inventor： GRIFFIS PATRICK DOUGLAS ,  RINDAL ABRAHAM E

IPC: H03D3/02 ,  H04N5/60 ,  H04N5/62

Abstract: A frequency translation phase-locked loop (PLL) is provided for detecting the audio information from a received television signal. The PLL includes a switching arrangement which, in a first position causes the loop to process the IF picture and sound carriers for detecting the audio information in an intercarrier type of detection method and, in a second position causes the loop to process the IF sound carrier for detecting the audio information without the use of the received picture carrier, in a "separate" (split-sound) type of audio detection method.

公开(公告)号：DE3338993A1

公开(公告)日：1984-05-03

申请号：DE3338993

申请日：1983-10-27

Applicant: RCA CORP

Inventor： RINDAL ABRAHAM E ,  GRIFFIS PATRICK DOUGLAS

IPC: H03D3/02 ,  H04N5/60 ,  H04N5/62

Abstract: A frequency translation phase-locked loop (PLL) is provided for detecting the audio information from a received television signal. The PLL includes a switching arrangement which, in a first position causes the loop to process the IF picture and sound carriers for detecting the audio information in an intercarrier type of detection method and, in a second position causes the loop to process the IF sound carrier for detecting the audio information without the use of the received picture carrier, in a "separate" (split-sound) type of audio detection method.