Abstract: An input device inputs waveform number data containing number assigned to a special-effect waveform to be selectively generated. A memory unit is connected to the input device in order to store the waveform number data as input by the input device into the memory unit. A memory selector supplies memory select data to the memory unit for reading out the waveform number data from the memory unit. A waveform code converter converts the waveform number data, as read out from the memory unit, into waveform codes, which correspond to the special-effect waveform to be selectively generated. A special-effect waveform generator generates a special-effect waveform signal in response to the waveform code applied from the waveform code converter. The generated special-effect waveform signal corresponds to the waveform code applied.

Abstract: A system is disclosed which controls the phase or the peak position of a continuous parabolic wave to move the position of a circular or elliptic montage pattern on the screen of a television cathode ray tube. A fundamental parabolic wave whose amplitude and phase are fixed and a sawtooth wave are produced at a predetermined frequency (horizontal line- and vertical field-scanning frequency). A predetermined DC potential is inserted into the parabolic wave signal during a specific period of each cycle or a horizontal fly-back time. A DC potential proportional to a position control quantity of the montage pattern is inserted into the sawtooth wave signal during the specific period of each cycle thereof. Then, the sawtooth wave signal is controlled in its amplitude in proportion to the position control quantity and is mixed with the parabolic signal to produce a horizontal or vertical parabolic wave component.

Abstract: An apparatus for providing a video montage to a television picture image comprises first and second signal generators adapted to generate first and second signals in synchronism with the television horizontal and vertical scanning signals, respectively, first and second signal combining circuits adapted to set those portions of the first and second signals corresponding to a horizontal blanking period at a reference level, a mixer for mixing outputs of the first and second signal combining circuits, a clamping circuit for clamping the reference level portion of the output of the mixer at a predetermined clamp level, a slicer for slicing an output of the clamp circuit at a predetermined level width with the predetermined clamp level substantially at a midlevel to obtain a control signal so as to synthesize two channel video signals.

Abstract: A control panel is used onto which a block is mounted having a region with a pattern for indicating a kind of special image effects and regions containing discriminating information for a first and second special image effects corresponding to the pattern. A detecting means is also included which detects a desired discriminating information of the block and produces a code signal corresponding to the desired discriminating information. A video signal producing means produces a video signal having the special image effect corresponding to the code signal when it receives the code signal.