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1. 发明授权

US3790707A Method and apparatus for deriving a velocity signal from continuously moving information bearing media 失效
公开(公告)号：US3790707A
公开(公告)日：1974-02-05
申请号：US3790707D
申请日：1972-07-03
申请人： EASTMAN KODAK CO
发明人： VALENTA H
IPC分类号： H04N9/11 , H04N3/38 , H04N5/257 , H04N5/86
CPC分类号： H04N3/38 , H04N9/11
摘要： The velocity of continuously moving information bearing media, such as perforated motion picture film bearing successive image frames, is derived from the detection of the movement of the image frames past first and second image frame detecting means displaced apart a distance Delta D in the direction of continuous movement and the production of corresponding first and second time-spaced signals having first and second time periods, respectively. Means are provided for transforming the first and second time-spaced signals into a velocity signal, such means including a reference signal having a value representative of the physical distance Delta D, first integrator means responsive to the velocity signal for producing a first ramp signal having a ramp slope dependent upon the value of the velocity signal and a period established by the second signal, difference means responsive to the reference signal and the first ramp signal for producing a second ramp signal representative of the instantaneous difference between the value of the reference signal and the time varying ramp slope of the first ramp signal, second integrator means responsive to the instantaneous amplitude of the difference signal for producing the velocity signal, and gate means responsive to the first signal that operates as a sampling signal for applying the second ramp signal to the second integrator means for a sampling period corresponding to the first period of the first signal, whereby the second integrator means is responsive to the sampled instantaneous value of the second ramp signal during the sampling period to produce the velocity signal having a value representative of the first predetermined rate of movement of the information bearing media and independent of non-uniform spacings of successive image frames. In telecine reproduction apparatus, the first ramp signal may be employed to modify the scanning rate of the telecine apparatus to synchronize it to the continuously moving image frames.

2. 发明授权

US3769598A Gain control circuit 失效
标题翻译：增益控制电路
公开(公告)号：US3769598A
公开(公告)日：1973-10-30
申请号：US3769598D
申请日：1971-10-15
申请人： EASTMAN KODAK CO
发明人： SCHAUFFELE C , VALENTA H
IPC分类号： H04N3/38 , H04N9/11 , H03K4/08
CPC分类号： H04N3/38 , H04N9/11
摘要： A method and apparatus for regulating the rate of change of first and second sawtooth waveform signals. First and second, 180* out-of-phase, sawtooth waveform signals are generated by sawtooth waveform signal generating circuits in response to first and second trigger signals, each of the sawtooth waveform signals having a frequency equal to the first frequency of the first and second signals. The instantaneous amplitudes of the first and second sawtooth waveform signals are alternately applied, in response to second and first trigger signals, respectively, to a rate of change regulating circuit for the first and second sawtooth waveform signal generating circuits, the rate of change regulating circuit including an integrating circuit for comparing the instantaneous amplitudes with a reference amplitude and storing the instantaneous amplitudes of the sampled first and second sawtooth waveform signals to produce a control signal that is integrated by the first and second sawtooth waveform signal generating circuits to generate the first and second sawtooth waveform signals.
摘要翻译：自动扫描连续移动或静止的图像承载介质以响应于检测到的介质的移动速率产生电视的视频信号。介质的图像帧以标准水平和垂直偏转频率在间隔线的电视场扫描光栅图案中扫描。检测介质的移动速度，产生两个180°的相位，半帧频率，锯齿波形信号。两个锯齿波形中的一个或另一个的周期部分与标准垂直偏转频率锯齿波形信号组合以产生复杂的垂直偏转频率，锯齿波形信号有效地自动将扫描光栅图案注册在正确的运动图像帧。通过标准垂直偏转，锯齿波形信号和帧间距不规则检测并自动扫描固定框架，或自动补偿胶卷速率。

3. 发明授权

US3769457A Stop-in-frame method and apparatus for film video player 失效
公开(公告)号：US3769457A
公开(公告)日：1973-10-30
申请号：US3769457D
申请日：1972-09-27
申请人： EASTMAN KODAK CO
发明人： VALENTA H , MARTIN W , METZGER L
IPC分类号： H04N3/36 , H04N3/38 , H04N5/257 , H04N5/84 , H04N5/36 , H04N5/30
CPC分类号： H04N3/38
摘要： An electronic film video player for converting pictorial information in image frames on motion picture film into video signals for reproduction of the pictorial information as a video display. Film transport apparatus is operable in a play mode for continuously moving the motion picture film past a scanning gate in a forward direction. The image frames are scanned by a beam of light produced by a flying spot scanner of electrical to-optical signal transducer apparatus in a raster having a horizontal-tovertical aspect ratio related to the aspect ratio of the image frames, and the continuous rate of movement of the motion picture film past the scanning gate. Optical-to-electrical signal transducer apparatus responds to the moving spot of light modulated in intensity by the pictorial information content of the scanned image frames for producing video signals representative thereof. The film transport apparatus is alternately operable in a rewind mode for continuously moving the motion picture film in a reverse direction to rewind the motion picture film. The film transport apparatus is also operable in a still mode for scanning a stationary image frame located in a predetermined position in the scanning gate. The stationary image frame is located in the predetermined position from either the play or rewind modes of operation of the film transport apparatus through the operation of a control circuit which halts forward or reverse film motion upon a still mode command signal, advances the motion picture film in the forward direction after a time delay sufficient to ensure that film motion has ceased, detects the entry of the image frame to be viewed into the predetermined position in the scanning gate, and halts forward film motion. The scanning beam is suppressed in response to the still command signal until the stationary image frame is located in the predetermined position for still frame scanning. The aspect ratio of the raster produced by the flying spot scanner is made to conform to the aspect ratio of the stationary image frame.

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