A video telephone displays a still picture in a first picture mode and a still picture in a second picture mode, which is smaller than that of the first picture mode, using image data transmitted over an audio signal transmission line and includes a memory having an address capacity corresponding to the size of the still picture in the first picture mode. In this video telephone, when image data of the still picture in the first picture mode is received, the image data is written in all addresse...

A video camera including an under grip which can be removably mount to the bottom portion of a main body of the video camera. In the video camera, on the side of the video camera main body, there is arranged photographing button of a double action type which instructs alternately the start and stop of photographing each time the button is operated and, on the side of the under grip, there is arranged a photographing button of a single action for instructing the start of photographing only while ...

In a camera having a lens for focussing incident light onto a light reception surface of a pick-up so that the latter outputs a camera signal, a stop for limiting the amount of the incident light, and a variable gain amplifier for correcting the level of the camera signal; there is provided a control circuit which controls a focus of the lens, the stop and a gain of the variable gain amplifier on the basis of the output of the variable gain amplifier, thereby simplifying the construction of the ...

A video apparatus comprises a correction circuit for delaying a luminance stream in a digital stream. The correction circuit has a demultiplexer, a line buffer and a multiplexer to achieve this. This construction enables compensation of the luminance 2H-delay of conventional VHS and S-VHS signals. A process is disclosed for improving the picture quality of conventional VHS and S-VHS signals and for recording the corrected or quality-improved signals.

In a video tape recorder for recording and/or playing back a picture carrier which has been angularly modulated with a video signal, the recorder including a rotating capstan drum having two electromagnetic transducer heads mounted to travel along oblique tracks on a magnetic tape and alternatingly scan the tape, both heads being active to scan the tape simultaneously in overlap zones along the drum, an audio carrier which has been frequency modulated with an audio signal is recorded together wi...

A video processing circuit separates chrominance and luminance signals and processes the same separately from synchronizing information whereby the video signal may be reformed with a selected video level, selected color saturation, and selected chroma hue. The synchronizing information is not reprocessed, but is coupled through the circuit and the other video signal portions are adjusted relative thereto. An output circuit provides a stable output with very low distortion by including a negativ...

In a video tape recorder for recording a television signal composed of a picture carrier which has been frequency modulated with a video luminance signal, a chrominance subcarrier which has been modulated with a chrominance signal, and a plurality of audio carrier signals each composed of an audio carrier which has been frequency modulated with a respective audio signal along a recording track, and for playing such a signal, there are provided a recorder portion including circuits for reducing t...

A video switching method for switching between two video signal sources for display on a monitor is employed by intensity modulating a video signal on a television raster lines and frames. Digital values representing pixel positions on the field when a switch is to occur from one source to another are stored. The representations of the pixels during the generation of the raster are counted and compared with the stored representations to effect switching when a equality between the two representa...

An apparatus and method are provided for transmitting video data over telephone lines. The apparatus is particularly applicable for transmitting and receiving images of persons speaking to each other. In one form, a portable self-contained unit is provided at each end of a conventional telephone circuit wherein the transducers of the mouthpiece and earpiece of each telephone are respectively acoustically coupled to respective acoustic output and input electrical-to-sound and sound-to-electrical ...

A video system including a video camera which has an image signal recording system for recording on a recording medium the image signal obtained from a photo-electric conversion means and a reproducing device which contains a driving mechanism for driving the medium in the video camera.