Abstract: A prescan system, and a reproducing apparatus having such a prescan system, which performs a prescan of a recording medium to determine whether auxiliary information (such as audio signal information, character information, code information or the like) is recorded thereon in association with video information. If such auxiliary information is present, the prescan is completed to permit appropriate read-out or other use of the auxiliary information. If no such information is detected, the prescan is terminated, to reduce unnecessary loss of time. Even if such auxiliary information is present, the prescan can be terminated by an instruction from an operator.

Abstract: An adaptive type differential encoding method and a device for differentially encoding a color image signal consisting of a plurality of component signals are arranged: To form sample signals for the component signals by sampling the color image signal for every component signal thereof; to form differential signals for the component signals by using the sample signals; to set an allowable quantization error at least for one of the plurality of component signals; to set quantizing characteristics for the differential signals according to the size of the allowable quantization error; and to quantize and encode the differential signals on the basis of the set quantizing characteristics. The arrangement takes the visual perception characteristic of man and enables a differential encoding process to be efficiently accomplished on the color image signal without causing any conspicuous signal deterioration.

Abstract: In the disclosed recording and/or reproducing apparatus, a switch detects whether the recording medium is mounted on the apparatus and a signal detecting head detects whether a signal is recorded on each of the recording tracks of the medium. In response to the switch detecting that the medium is mounted on the apparatus, a control circuit causes the signal detecting head sequentially to scan the recording tracks on the recording medium one after another. A memory stores the output of the signal detecting head during the sequential scanning operation so that a vacant track search operation can be accomplished within a short period of time.

Abstract: An image processing apparatus includes a reproducing device for reproducing recorded image data from a medium on which a plurality of image data are recorded. Apparatus is provided for supplying to a monitor the reproduced image data as a multi-screen wherein one screen of the monitor displays a plurality of smaller screens each corresponding to a respective one of the plurality of image data. Structure is provided for designating at least one of the smaller screens displayed on the multi-screen, and circuitry is provided for erasing from the medium image data corresponding to one of the smaller screens designated by the designating structure.

Abstract: An erasing device for erasing a signal recorded on a recording medium on which an audio signal and a video signal are recorded together has a first erasing mode for erasing the audio signal, a second erasing mode for erasing the video signal, and a third erasing mode for erasing both the audio and video signals.

Abstract: An encoding apparatus for compressing and outputting image data by performing prediction differential encoding of the image data. The apparatus forms first prediction data, receives the image data and forms and outputs first differential data which is equal to the difference between the received image data and the first prediction data. The apparatus also quantizes the first differential data and forms first quantization differential data. Second predication data is formed and output, and a second differential data which is equal to the difference between the first prediction data and the second prediction data.

Abstract: Video signal processing apparatus in which a reproduced signal and a delayed video signal produced by a delay mechanism are selectively produced and supplied to the delay mechanism and the delayed video signal produced by the delay mechanism is mixed with the video signal to be supplied to the delay mechanism.This application is a continuation of application Ser. No. 017,001, filed Feb. 19, 1987, now abandoned, which is a continuation of application Ser. No. 545,750, filed Oct. 26, 1983, now abandoned.

Abstract: An apparatus for color signal processing wherein plurality kinds of color component signals are input. Sample-and-holding and analog-to-digital conversion indicating signals are generated asynchronously. The color component signals are sampled and held in response to the sample-and-holding indicating signal. The analog output is then converted to digital signal by an analog-to-digital converter in response to the analog-to-digital conversion indicating signal.

Abstract: A recording apparatus is provided with detecting means for detecting any abnormality of a synchronizing signal included in an incoming signal; processing means for processing the incoming signal into a print recording signal; and print recording means for carrying out print recording in accordance with the print recording signal. Erroneous recording is prevented by inhibiting the print recording signal from being supplied to the print recording means when any abnormality is detected in the synchronizing signal.

Abstract: A video signal processing apparatus comprising: an oscillator for generating a frequency signal for sampling a video signal, the oscillator permitting its oscillating frequency to be varied; a sampler for sampling the video signal by the frequency signal; and an instructing circuit for instructing a charge in the number of samples in one frame taken by the sampler, wherein the oscillator changes the oscillating frequency in accordance with the instruction.

Abstract: A video image apparatus which records an image corresponding to a video signal including synchronizing signals is disclosed. The apparatus includes a detector for detecting a lack of synchronizing signals and a controller responsive to the detector for inhibiting the record operation in order to cope satisfactorily with interruption of the input video signal. Preferably, the apparatus further includes a restart unit for restarting the recording operation from the position where the recording operation has stopped after the input video signal has been restored.

Abstract: The predictive coder of the present invention is an apparatus for converting data into variable-length codes and outputting them, in which a differential data item is calculated from an input information data item and a predictive data item, a subsequent predictive data item is calculated using the quantized differential data item obtained by quantizing the differential data item, and coding is performed in such a manner that quantized differential data item indicating a data value having the maximum frequency of occurrence of quantized differential data items is coded as a code having a shortest length.

Abstract: A video signal processing device for separating horizontal and vertical synchronizing signal components from an applied video signal, for forming a field discrimination signal upon discriminating the field represented by each field video signal on the basis of the separated horizontal and vertical synchronizing signal components, and for detecting abnormality or deviation from a predetermined variation in the field discrimination signal due to a defect of the synchronizing signal components or a different type or format of a video signal.

Abstract: A video signal processing apparatus including a sampling circuit for sampling image color signals and a signal generating circuit for delivering a signal showing the position of the sampling pulses of the sampling circuit in the image plane to a display monitor apparatus.

Abstract: Apparatus is disclosed for processing an incoming video signal having line sequential R-Y and B-Y color difference signals at respective different DC offsets. The apparatus includes first and second memory circuits for receiving the incoming signal and for respective storage of the offsets of the R-Y and B-Y color difference signals. A computing circuit is operative selectively to subtract the contents of the first and second memory circuits from the incoming signal line sequence parts to provide offset-free versions thereof.

Abstract: An image processing apparatus for printing an image signal consisting of a number of horizontal scanning lines comprises: a sampling circuit for sampling this image signal; an interval changing circuit for changing the sampling interval in the horizontal direction of the sampling circuit; a region changing circuit for narrowing the sampling region of the sampling circuit whenever the sampling interval becomes narrow; and an interpolating circuit for performing the interpolation in the vertical scanning direction in response to the sampling interval becoming narrow. The number of sampling points or the number of horizontal scanning lines which are sampled by the sampling circuit may be changed. In this case, the interpolating circuit performs the interpolation in the vertical direction in response to such a reduction. The image signal may be a television signal consisting of color image signals of R, G and B.

Abstract: A video signal processing system including an A/D converting circuit for analog-to-digital converting an input video signal; a storing circuit for storing data produced from the A/D converting circuit; a coefficient multiplying circuit for multiplying the data stored at the storing circuit by coefficients; and a control circuit for controlling the coefficients for the coefficient multiplying circuit in obtaining a scanning line interpolation signal or a drop-out compensating signal.

Abstract: The color adjusting device of the invention is provided with coordinate axis converting means in which a plurality of independent chrominance signals at the respective inlets after having been converted with respect to the coordinate axes based on a linear equation whose terms include trigonometrical functions, are placed onto respective outlets. This coordinate axis converting means includes memories operating with preset certain functions, and, moreover, has a function of turning the axes for the ordinates of the chrominance signals about their origin in the common plane, and includes vector level control means for the chrominance signals in the turned axes. That coordinate axis converting means further includes means receptive of the chrominance signals for producing a luminance signal and means for controlling the level of the luminance signal.

Abstract: A magnetic recording and reproducing apparatus which comprises recording and reproducing means including a magnetic recording/reproducing head and a capacitor connected in series to one end of the head winding to remove the DC component of a recording current flowing to the head; recording/reproduction switch-over apparatus including first and second switching circuits which are respectively grounded on the sides opposite the sides associated with the wiring of the head; and inhibiting apparatus for inhibiting the recording/reproduction switch-over apparatus from operating as a result of a variation in the potential of one terminal of the capacitor.

Abstract: A differential phase shift keying demodulator in which a signal modulated by differential phase shift keying is compared with the modulated signal delayed an integral number times as much as a period of the carrier wave of the modulated signal and shorter than a transmission period for one bit of the modulated signal.