US4189751A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Solid state television camera with defect compensation to reduce noise
Assignee: Sony Corp
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Filing: 1977-04-22
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Granted: 1980-02-19
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Expires: 1997-04-22
Abstract
Abstract A solid state television camera having a solid state image sensor onto which an image of an object is projected, a sampling hold circuit supplied with an output signal derived from the solid state image sensor, a level detecting circuit for the derived output signal, and a control circuit supplied with an output signal from the level detecting circuit in which a detecting level is selected as a predetermined level at a reference time which differs from the arrival time of the sampling signal by a predetermined time interval. The solid state television camera can remove noise caused by defects in the solid state image sensor by a defect compensating operation.
Inventors
- 👤 Fumio Nagumo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 05:28
CPC Classifications
H; H04; H04N; H04N25/00; H04N25/40; H04N25/44; H04N25/447; H04N25/60; H04N25/67; H04N25/671; H04N25/673
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
131 words
A solid state television camera comprising: a solid state image sensor onto which an image of an object is projected and which produces a derived output signal; a sampling hold circuit to which said derived output signal is supplied; a level detecting circuit also having said derived output signal supplied thereto and having means for detecting a level of said derived output signal; a control circuit supplied with an output from said level detecting circuit and with a sampling signal and having means to control the gating of said sampling signal to said sampling hold circuit; and said detecting circuit having a detecting level of said derived output signal which occurs at a reference time which differs from the time of occurrence of said sampling signal by a predetermined time interval.
Claim 2
Dependent Claim
131 words
A solid state television camera comprising: a solid state image sensor onto which an image of an object is projected and which produces a derived output signal; a sampling hold circuit to which said derived output signal is supplied; a level detecting circuit also having said derived output signal supplied thereto and having means for detecting a level of said derived output signal; a control circuit supplied with an output from said level detecting circuit and with a sampling signal and having means to control the gating of said sampling signal to said sampling hold circuit; and said detecting circuit having a detecting level of said derived output signal which occurs at a reference time which differs from the time of occurrence of said sampling signal by a predetermined time interval.
Claim 3
Dependent Claim
39 words
A solid state television camera as claimed in claim 1, wherein the reference time is selected at a time before the arrival of the sampling signal by more than the response time delay (τ) of said level detecting circuit.
Claim 4
Dependent Claim
47 words
A solid state television camera as claimed in claim 1, wherein the detecting level is selected at a point on said sampling signal which occurs prior to the occurrence of said sampling signal where the level of said derived output signal is greater than a white level.
Claim 5
Dependent Claim
19 words
A solid state television camera as claimed in claim 1, wherein said level is greater than a white level.
Claim 6
Dependent Claim
134 words
A solid television camera in which noise is compensated comprising: a solid state image sensor onto which an image of an object is projected; a sampling hold circuit supplied with a derived output signal from said solid state image snesor; a source of sampling signal; a control circuit means including a level detecting circuit for comparing a level of said derived output signal with a detecting level at a reference time; said control circuit producing an initial control signal corresponding to the presence of said derived output signal at points thereof which are greater than said detecting level; means for producing a logical sum of said initial control signal and said sampling signal; and said means producing a final control signal and means for applying the final control signal to said sampling hold circuit.
Claim 7
Dependent Claim
134 words
A solid television camera in which noise is compensated comprising: a solid state image sensor onto which an image of an object is projected; a sampling hold circuit supplied with a derived output signal from said solid state image snesor; a source of sampling signal; a control circuit means including a level detecting circuit for comparing a level of said derived output signal with a detecting level at a reference time; said control circuit producing an initial control signal corresponding to the presence of said derived output signal at points thereof which are greater than said detecting level; means for producing a logical sum of said initial control signal and said sampling signal; and said means producing a final control signal and means for applying the final control signal to said sampling hold circuit.
Claim 8
Dependent Claim
32 words
A solid state television camera as claimed in claim 1, wherein said level detecting circuit includes an operational amplifier which is also supplied with a reference signal from a reference signal source.
Claim 9
Dependent Claim
69 words
A solid state television camera as claimed in claim 6, wherein said control circuit includes a flip-flop circuit which is supplied with an output from said operational amplifier as well as with a further reference signal and an AND-circuit which is supplied with an output derived from said flip-flop circuit as well as with said sampling signal, as output from said AND-circuit being applied to said sampling hold circuit.
Claim 10
Dependent Claim
136 words
In a solid state television camera having a solid state image sensor from which is derived a video signal, a compensation circuit comprising: a circuit means supplied with said video signal for level detecting the same and for producing a detected output signal; a source of reference signal; means utilizing the detected output signal and the reference signal to produce an initial control signal which occurs only in the presence of an undesired noise level; a source of sampling signal; means for combining the initial control signal and the sampling signal to eliminate sampling pulses from the sampling signal during the occurrence of the initial control signal and producing a final control signal; a sampling hold circuit to which is supplied said video signal; and means supplying said final control output to said sampling hold circuit.
Claim 11
Dependent Claim
136 words
In a solid state television camera having a solid state image sensor from which is derived a video signal, a compensation circuit comprising: a circuit means supplied with said video signal for level detecting the same and for producing a detected output signal; a source of reference signal; means utilizing the detected output signal and the reference signal to produce an initial control signal which occurs only in the presence of an undesired noise level; a source of sampling signal; means for combining the initial control signal and the sampling signal to eliminate sampling pulses from the sampling signal during the occurrence of the initial control signal and producing a final control signal; a sampling hold circuit to which is supplied said video signal; and means supplying said final control output to said sampling hold circuit.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-02-18 | 1983-08-20 | 1984-02-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-02-18 | 1987-08-20 | 1988-02-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-02-18 | 1991-08-20 | 1992-02-19 | $7700.00 | Window Closed / Lapsed |