Abstract: A video camera apparatus comprises a camera unit, a lens unit detachable from the camera unit and a communication circuit for communicating control information between a computer of the camera unit and a computer of the lens unit, wherein at least one of the camera unit and the lens unit comprises a memory for storing information indicating a version of the control information by which both of the camera unit and the lens unit can communicate with each other for control, and the information representing the version can be transmitted by the memory to the other unit to vary or select the control command or contents of the control command.

Abstract: The disclosure recording and reproducing apparatus is arranged to have a control signal recorded in a predetermined track on a recording medium and is arranged to control the reproduced level of an audio or video signal by reproducing the control signal.

Abstract: Disclosed is an automatic focus control system including an active type automatic focusing device. The system further includes detecting apparatus which produces a characteristic signal when detecting that an image forming optical apparatus is in an out-of-focus condition, and control means which renders the automatic focusing device in an inoperative condition when the optical apparatus reaches an in-focus condition. It also renders the focusing device in an operative condition in response to the characteristic signal produced by the detecting apparatus.

Abstract: In a recording apparatus for performing magnetic recording onto different parts of a magnetic recording medium as it runs in sequence, a switching element is connected in series in a signal path to a magnetic head which is connected to the output of the signal amplifier and to a bias oscillator. Accordingly, the signal current flowing to the magnetic head can be interrupted. A delay circuit is provided for controlling the operation of the switching element so as to defer initiation of the signal current flow to the magnetic head. This is done pending attainment of the speed of movement of the magnetic recording medium to a substantially constant level after the magnetic recording starts. Connected in parallel to the switching element is a by-pass circuit of which the impedance is relatively low at a frequency equal to that of the bias supplied to the magnetic head. A stabilized muting effect from the low to the high sound region thus can be produced.

Abstract: In the disclosed sound motion picture camera, a sound overlap device keeps the sound level constant during a predetermined time after the start of a fade out operation, then gradually lowers the sound level and then gradually raises the sound level during the start of a fade in operation.

Abstract: In a sound motion picture camera which permits both sound filming and silent filming by selective use of a sound film cartridge and a silent film cartridge, utilization is made of only signals from loop detecting means for detecting variations in the length of a loop of sound film formed between the exposure station and the sound recording station of the camera during the use of the sound film cartridge, whereby during the use of the silent film cartridge, the film transport speed of a first film transport means for effecting film transport at the exposure station is automatically set to a first speed suited for use of the silent film cartridge and during the use of the sound film cartridge, the film transport speed of the first film transport means is changed over between a second speed higher than the film transport speed of a second film transport means for effecting film transport at the sound recording station and a third speed lower than the film transport speed of the second film transport means in acc

Abstract: In the disclosed motion picture projector the original sound recorded on the main magnetic stripe along one edge of a film stripe also having a magnetic balance stripe along the other edge of the same film surface, is reproduced by a recording-reproducing head. A second recording-reproducing head records the signal on the balance stripe. While the original sound signal is being heard, the first recording-reproducing head overlaps a second sound signal on the main stripe. A part of the original sound signal on the main stripe may be erased and a new signal recorded in its place.

Abstract: A sound motion picture camera, capable of using a film strip having a main stripe of magnetic recording material along one side edge of one surface and a balance stripe of magnetic recording material along the other edge of the same surface as well as its motion picture. The camera has a recording magnetic head arranged in correspondence with the main stripe and a second recording magnetic head arranged in correspondence with the balance stripe. Thus the same sound signal can be recorded on both the main and the balance stripe through first and second recording magnetic heads. Separate from the camera a sound recording/reproducing device for cooperation with the aforementioned film is provided with a sound recording/reproducing head and an erase magnetic head in a position corresponding to the main stripe and a sound reproducing head in a position corresponding to the balance stripe. A sound signal recorded on the balance stripe is reproduced by the sound reproducing head and heard through a speaker.

Abstract: A sound motion picture camera with sound recording equipment rendering it possible to record sound accompaniments by way of a magnetic track on the picture film and provided with an automatic gain control circuit operating with attack and recovery times automatically controlled in accordance with variation of the dynamic range of the sound accompaniment.

Abstract: In the exposure control apparatus disclosed, a photo-electric element converts light to which it is exposed to an electrical quantity. A pulse entry circuit responds to the photo-electric element and enters a sequence of sets of pulses into a memory. Each set of pulses corresponds in number to the electric quantity and erases the previous set. A timing clock responds to a signal from a shutter opening member and keeps reading out the content of the memory until the memory is empty at which time the circuit, in conjunction with the memory, produces a shutter closing signal.