EP0178900A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Television receivers
Assignee: Sony Corp
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Filing: 1985-10-15
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Granted: —
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Expires: 2005-10-15
Abstract
Abstract A television receiver comprises a video signal receiving circuit for receiving a video signal, a vertical synchronising signal and a horizontal synchronising signal, a signal processing circuit for supplying the video signal to a cathode ray tube, a vertical deflection circuit for supplying a vertical deflection signal to the cathode ray tube in response to the vertical synchronising signal, and a horizontal deflection circuit for supplying a horizontal deflection signal to the cathode ray tube in response to the horizontal synchronising signal. A frequency detector circuit (31) is connected to the video signal receiving circuit for detecting the frequency of the horizontal synchronising signal and deriving a control signal in response thereto, and a control circuit (12) is connected between the frequency detector circuit (31) and the horizontal deflection circuit for controlling the horizontal deflection circuit in response to the control signal from the frequency detector circuit (31). The horizontal deflection circuit includes a circuit (80) for changing the duty cycle of a horizontal drive pulse such that the duty cycle increases when the horizontal frequency becomes higher.
Inventors
- 👤 Masafumi C/O Sony Corporation Kikuchi
- 👤 Toshio C/O Sony Corporation Onodera
- 👤 Sumio C/O Sony Corporation Toyama
- 👤 Hiroshi C/O Sony Corporation Sakamoto
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-31 14:09
CPC Classifications
H; H04; H04N; H04N3/00; H04N3/10; H04N3/14; H04N3/16; H04N3/27; H04N9/00; H04N9/64; H04N9/641
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
178 words
A television receiver comprising: video signal receiving means (1,20,21) for receiving a video signal, a vertical synchronising signal and a horizontal synchronising signal; a signal processing circuit (2,3) for supplying the video signal to a cathode ray tube (6); a vertical deflection circuit (8) for supplying a vertical deflection signal to the cathode ray tube (6) in response to the vertical synchronising signal; a horizontal deflection circuit for supplying a horizontal deflection signal to the cathode ray tube (6) in response to the horizontal synchronising signal; frequency detecting means (11,31) connected to the video signal receiving means (1,20,21) for detecting the frequency of the horizontal synchronising signal and deriving a control signal in response thereto; and control means (12) connected between the frequency detecting means (11,31) and the horizontal deflection circuit for controlling the horizontal deflection circuit in response to said control signal from the frequency detecting means (11,31); the horizontal deflection circuit including means (80) for changing a duty cycle of a horizontal drive pulse such that the duty cycle increases when the horizontal frequency becomes higher.
Claim 2
Dependent Claim
178 words
A television receiver comprising: video signal receiving means (1,20,21) for receiving a video signal, a vertical synchronising signal and a horizontal synchronising signal; a signal processing circuit (2,3) for supplying the video signal to a cathode ray tube (6); a vertical deflection circuit (8) for supplying a vertical deflection signal to the cathode ray tube (6) in response to the vertical synchronising signal; a horizontal deflection circuit for supplying a horizontal deflection signal to the cathode ray tube (6) in response to the horizontal synchronising signal; frequency detecting means (11,31) connected to the video signal receiving means (1,20,21) for detecting the frequency of the horizontal synchronising signal and deriving a control signal in response thereto; and control means (12) connected between the frequency detecting means (11,31) and the horizontal deflection circuit for controlling the horizontal deflection circuit in response to said control signal from the frequency detecting means (11,31); the horizontal deflection circuit including means (80) for changing a duty cycle of a horizontal drive pulse such that the duty cycle increases when the horizontal frequency becomes higher.
Claim 3
Dependent Claim
30 words
A television receiver according to claim 1, wherein the means for changing the duty cycle of the horizontal drive pulse includes a monostable multivibrator (80) having a predetermined time constant.
Claim 4
Dependent Claim
33 words
A television receiver according to claim 2, wherein the predetermined time constant is variable in response to said control signal such that the time constant becomes shorter when the horizontal frequency becomes higher.
Claim 5
Dependent Claim
29 words
A television receiver according to claim 1, claim 2 or claim 3, wherein the video signal receiving means (1,20,21) is capable of selectively receiving standard and non-standard video signals.
Claim 6
Dependent Claim
40 words
A television receiver according to claim 4, wherein the frequency detecting means (11,31) includes a switchable means (32,33) for providing a predetermined constant voltage as said control signal when the video signal receiving means (1,20,21) receives the standard video signal.
Claim 7
Dependent Claim
41 words
A television receiver according to claim 4 or claim 5, wherein the video signal receiving means (1,20,21) includes a first input terminal (1) for receiving the standard video signal and a second input terminal (20,21) for receiving the non-standard video signal.
Claim 8
Dependent Claim
49 words
A television receiver according to claim 4, claim 5 or claim 6, which is capable of selectively receiving a standard video signal that is in a form of a composite video signal and a non-standard video signal that is in a form of red, green and blue video signals.
Claim 9
Dependent Claim
216 words
A television receiver comprising: video signal receiving means (1,20,21) for receiving a video signal, a vertical synchronising signal and a horizontal synchronising signal; a signal processing circuit (2,3) for supplying the video signal to a cathode ray tube (6); a vertical deflection circuit (8) for supplying a vertical deflection signal to the cathode ray tube (6) in response to the vertical synchronising signal; a horizontal deflection circuit for supplying a horizontal deflection signal to the cathode ray tube (6) in response to the horizontal synchronising signal, the horizontal deflection circuit including an oscillator (35) operable in synchronism with the horizontal synchronising signal, a drive stage (36) and an output switching device (37); power supply means (18,39) for supplying an operational voltage to the output switching device (37); frequency detecting means (11,31) connected to the video signal receiving means (1,20,21) for detecting the frequency of the horizontal synchronising signal and deriving a control signal in response thereto; and control means (38) for supplying said control signal to the power supply means (18,39) for increasing said operational voltage when the horizontal frequency becomes higher; the horizontal deflection circuit including means (80) for changing a duty cycle of a horizontal drive pulse from the drive stage (36) such that the duty cycle increases when the horizontal frequency becomes higher.
Claim 10
Dependent Claim
216 words
A television receiver comprising: video signal receiving means (1,20,21) for receiving a video signal, a vertical synchronising signal and a horizontal synchronising signal; a signal processing circuit (2,3) for supplying the video signal to a cathode ray tube (6); a vertical deflection circuit (8) for supplying a vertical deflection signal to the cathode ray tube (6) in response to the vertical synchronising signal; a horizontal deflection circuit for supplying a horizontal deflection signal to the cathode ray tube (6) in response to the horizontal synchronising signal, the horizontal deflection circuit including an oscillator (35) operable in synchronism with the horizontal synchronising signal, a drive stage (36) and an output switching device (37); power supply means (18,39) for supplying an operational voltage to the output switching device (37); frequency detecting means (11,31) connected to the video signal receiving means (1,20,21) for detecting the frequency of the horizontal synchronising signal and deriving a control signal in response thereto; and control means (38) for supplying said control signal to the power supply means (18,39) for increasing said operational voltage when the horizontal frequency becomes higher; the horizontal deflection circuit including means (80) for changing a duty cycle of a horizontal drive pulse from the drive stage (36) such that the duty cycle increases when the horizontal frequency becomes higher.
Claim 11
Dependent Claim
35 words
A television receiver according to claim 8, wherein the means for changing the duty cycle includes a monostable multivibrator (80) which forms a part of the drive stage (36) and has a predetermined time constant.
Claim 12
Dependent Claim
33 words
A television receiver according to claim 9, wherein said predetermined time constant is changeable in response to said control voltage such that the time constant becomes shorter when the horizontal frequency becomes higher.
References Cited (Backward Citations)
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