公开(公告)号：CA1101987A

公开(公告)日：1981-05-26

申请号：CA303453

申请日：1978-05-16

Applicant: SONY CORP

Inventor： HONGU MASAYUKI ,  KAWAKAMI HIROMI ,  TOKUHARA MASAHARU

IPC: H03D1/04 ,  H03D1/22 ,  H03D1/24 ,  H04N5/455 ,  H04B1/30 ,  H04B1/66

Abstract: SO1033 SYNCHRONOUS DETECTOR PARTICULARLY ADAPTED FOR A VIDEO IF SIGNAL A synchronous detector adapted to detect a modulated information signal, such as a video IF signal. The modulated information signal is provided in the form of a vestigial sideband signal. A band-pass filter including a tuned circuit tuned to the frequency of the carrier on which the information signal is modulated has a pass band which is less than the frequency spectrum of the vestigial sideband signal so as to limit the frequency spectrum of the signal passed by the filter to a double sideband signal. A limiter is coupled to the band-pass filter to receive the double sideband signal and for deriving a switching carrier therefrom, the frequency of the switching carrier being equal to the frequency of the carrier on which the information signal is modulated. An emitter-follower circuit is connected between the band-pass filter and the limiter so as to couple the double sideband signal from the filter to the limiter. A multiplier circuit has first input terminals coupled to the limiter for receiving the derived switching carrier and second input terminals for receiving the modulated information signal, whereby the modulated information signal is multiplied with the switching carrier to obtain the information signal. -i-

公开(公告)号：AU5682380A

公开(公告)日：1980-10-02

申请号：AU5682380

申请日：1980-03-25

Applicant: SONY CORP

Inventor： YAMADA HISAFUMI ,  TOKUHARA MASAHARU ,  KURIKI CHOEI

IPC: H04N5/21 ,  H04N5/52 ,  H04N17/00 ,  H04N5/48

公开(公告)号：AU5242279A

公开(公告)日：1980-05-15

申请号：AU5242279

申请日：1979-11-01

Applicant: SONY CORP

Inventor： HONGU MASAYUKI ,  OHMURO SHIGERU ,  TOKUHARA MASAHARU

IPC: H04N5/455 ,  H04N5/62 ,  H04N9/50

Abstract: A synchronous detector suitable for use in a color television receiver detects both a video signal and an audio IF signal, but in a fashion in which these two signals do not interfere with one another. In the detector, a tuner provides an IF signal in which the video signal and audio or sound IF signals are modulated on a carrier; a signal generator, such as a phase-locked loop, provides both a detecting signal synchronized with the carrier of the IF signal, and a comparing signal having the same frequency as the carrier of the IF signal but phase-shifted pi /2 therefrom; a synchronous detecting circuit for synchronously detecting the IF signal by the detecting signal to produce the video signal; and a phase comparator for phase comparing the IF signal with the comparing signal to provide the sound IF signal. In one arrangement, the phase comparator provides a filtered version of the sound IF signal as an AFT control signal to control the fine tuning of the tuner. In another embodiment, two phase comparators are included so that the sound IF signal and the AFT control signal are provided separately.

公开(公告)号：AU3629478A

公开(公告)日：1979-11-22

申请号：AU3629478

申请日：1978-05-19

Applicant: SONY CORP

Inventor： HONGU MASAYUKI ,  KAWAKAMI HIROMI ,  TOKUHARA MASAHARU

IPC: H03D1/04 ,  H03D1/22 ,  H03D1/24 ,  H04N5/455 ,  H04N9/50

Abstract: A synchronous detector adapted to detect a modulated information signal, such as a video IF signal. The modulated information signal is provided in the form of a vestigial sideband signal. A band-pass filter including a tuned circuit tuned to the frequency of the carrier on which the information signal is modulated has a pass band which is less than the frequency spectrum of the vestigial sideband signal so as to limit the frequency spectrum of the signal passed by the filter to a double sideband signal. A limiter is coupled to the band-pass filter to receive the double sideband signal and for deriving a switching carrier therefrom, the frequency of the switching carrier being equal to the frequency of the carrier on which the information signal is modulated. An emitter-follower circuit is connected between the band-pass filter and the limiter so as to couple the double sideband signal from the filter to the limiter. A multiplier circuit has first input terminals coupled to the limiter for receiving the derived switching carrier and second input terminals for receiving the modulated information signal, whereby the modulated information signal is multiplied with the switching carrier to obtain the information signal.

公开(公告)号：DE2821773A1

公开(公告)日：1978-11-30

申请号：DE2821773

申请日：1978-05-18

Applicant: SONY CORP

Inventor： HONGU MASAYUKI ,  KAWAKAMI HIROMI ,  TOKUHARA MASAHARU

IPC: H03D1/04 ,  H03D1/22 ,  H03D1/24 ,  H04N5/455 ,  H04N5/44 ,  H04N9/50

Abstract: A synchronous detector adapted to detect a modulated information signal, such as a video IF signal. The modulated information signal is provided in the form of a vestigial sideband signal. A band-pass filter including a tuned circuit tuned to the frequency of the carrier on which the information signal is modulated has a pass band which is less than the frequency spectrum of the vestigial sideband signal so as to limit the frequency spectrum of the signal passed by the filter to a double sideband signal. A limiter is coupled to the band-pass filter to receive the double sideband signal and for deriving a switching carrier therefrom, the frequency of the switching carrier being equal to the frequency of the carrier on which the information signal is modulated. An emitter-follower circuit is connected between the band-pass filter and the limiter so as to couple the double sideband signal from the filter to the limiter. A multiplier circuit has first input terminals coupled to the limiter for receiving the derived switching carrier and second input terminals for receiving the modulated information signal, whereby the modulated information signal is multiplied with the switching carrier to obtain the information signal.

公开(公告)号：DE2810280A1

公开(公告)日：1978-09-14

申请号：DE2810280

申请日：1978-03-09

Applicant: SONY CORP

Inventor： HONGU MASAYUKI ,  KAWAKAMI HIROMI ,  YAMAMOTO YOSHIHIRO ,  TOKUHARA MASAHARU

IPC: H03B5/12 ,  H03B27/00 ,  H03D1/22 ,  H03D3/24

Abstract: An oscillating circuit provides first and second reference signals having a phase difference of 90 DEG with respect to each other. The oscillating circuit includes an oscillator providing the first reference signal at an output thereof, a voltage-to-current converting circuit, which may incorporate a common-base transistor, and a capacitor connected between the output of the oscillator and an input of the converting circuit. The output of the converting circuit then provides the second reference signal which differs in phase by 90 DEG from the first reference signal. The oscillator may include differentially connected transistors and an LC resonant circuit.

公开(公告)号：DE69225732D1

公开(公告)日：1998-07-09

申请号：DE69225732

申请日：1992-03-03

Applicant: SONY CORP

Inventor： SARUGAKU TOSHIO ,  KAWASHIMA HIROYUKI ,  KITA HIROYUKI ,  TOKUHARA MASAHARU

IPC: H04N5/14 ,  H04N7/01 ,  H04N9/64 ,  H04N11/20 ,  H04N5/44

Abstract: Disclosed is a television receiver for extended definition television, the receiver carrying out scanning line interpolation in a way that eliminates picture shift on the screen and ensures normal display when supplied with a non-standard video signal having a scanning line count of other than 262.5 per field. The television receiver comprises scanning line interpolation means, normal video signal detection means and interpolation control means. The scanning line interpolation means effects scanning line interpolation using either data in the current field or out-of-field data as per the result of motion detection in the picture. The normal video signal detection means distinguishes the normal video signal from other signals by detecting the number of the scanning lines involved. The interpolation control means causes the scanning line interpolation means to effect scanning line interpolation using only the inside-field data if the supplied signal is a non-standard signal.

公开(公告)号：AU4270989A

公开(公告)日：1990-04-26

申请号：AU4270989

申请日：1989-10-10

Applicant: SONY CORP

Inventor： NAITO HIDEFUMI ,  SARUGAKU TOSHIO ,  TOKUHARA MASAHARU

IPC: H04N5/93 ,  H04N5/95 ,  H04N5/06 ,  H04N5/783

公开(公告)号：AU568563B2

公开(公告)日：1988-01-07

申请号：AU3139484

申请日：1984-08-01

Applicant: SONY CORP

Inventor： HONGU MASAYUKI ,  TAMURA TAKAHIKO ,  TOKUHARA MASAHARU

IPC: H04N5/16

Abstract: A dark signal component below a predetermined level of a video signal is varied such that a dark peak level is made to coincide with a pedestal level by feedback control. According to this configuration, a signal component toward a white level side above the predetermined level is not changed by dark restoration, thus obtaining stable color reproduction and stable brightness which are not affected by the dark restoring operation.

公开(公告)号：FR2551293B1

公开(公告)日：1987-12-11

申请号：FR8413090

申请日：1984-08-22

Applicant: SONY CORP

Inventor： TAMURA TAKAHIKO ,  TOKUHARA MASAHARU

IPC: H04N5/59 ,  H04N9/30 ,  H04N9/64

Abstract: A CRT drive control circuit for automatically limiting beam current when it is too large. A brightness reduction control and a contrast reduction control are alternately applied in accordance with a dark level detection of a video signal.