Abstract: MPEG video bitstreams comprising a mixture of I-, P- and B-pictures are transcoded for transfer between apparatuses (110 and 112), using an intermediate bitstream format which comprise essentially I-pictures. Additional information (122) is inserted into the intermediate bitstream in user data fields, to identify which pictures were I-pictures in the original bitstream, and which were not. When transcoding again to IPB format (126), loss of picture quality can be minimised using this knowledge of the original video bitstream structure, in particular by encoding as I-pictures those pictures which were encoded as I-pictures in the original bitstream.

Abstract: A magnetic tape (2) and an apparatus (1) for cooperation with this magnetic tape (2) are configured in such a manner that video signals and audio signals can be stored in an inclined-track zone (67) and that a control signal (D-CTL signal) can be stored in a control signal track (26) on the magnetic tape (2), for which the length L(D) of a recorded signal period is equal to the value, divided by N, of the distance D(D) in the longitudinal direction (3) of the tape between two inclined tracks (63) which can be scanned by the same magnetic head (D3), the control signal (D-CTL signal) being reproduced from the control signal track (26) when such a magnetic tape (2) is loaded into a video recorder (1) in accordance with the VHS standard or into a video recorder (1) in accordance with the invention, which is also capable of recording and reproducing analog video signals in accordance with the VHS standard, which reproduced control signal is applied to a speed control device for a capstan, which results in a tape s

Abstract: A first digital information signal, such as a digital video signal, is recorded in MPEG encoded form in the form of first packets in first track portions (TP.sub.1) on a record carrier. Program information contained packets (P.sub.0 ') are also recorded in the first track portions. In a subsequent editing step, an additional information signal, such as an audio signal, is MPEG encoded into second packets and recorded in second track portions (TP.sub.2) of the tracks. In order to enable a reproduction of the video signal and the additional audio signal in a later reproduction step, the program information contained packets (P.sub.0 ') recorded in the first track portions are such that the program information indicates that the first packets and at least the second packets belong together.

Abstract: A device for deriving a clock signal having a specific frequency, from an electrical signal, for example, a video signal, the device including an input terminal (1) for receiving the synchronizing signal; a phase comparator (5) having a first input coupled to the input terminal, a second input and an output; a voltage controlled oscillator (15) having an input coupled to the output of the phase comparator, and an output; a counter (23) having a first input coupled to the output of the voltage controlled oscillator, a second input for receiving a preset control signal, and an output coupled to the second input of the phase comparator; a preset control signal generator (30) having an input coupled to the input terminal, and an output coupled to the second input of the counter, the counter being adapted to set its count value to a preset value in response to the preset control signal applied to its preset control signal input.

Abstract: A vertical synchronization signal detector for detecting a vertical synchronization signal in a composite video signal.

Abstract: A digital-to-analog converter having a ladder resistor portion for generating a plurality of quantization signals of predetermined values based on reference signals of predetermined values and a quantization switch portion for selectively outputting one of the quantization signals in accordance with a digital input value. The ladder resistor portion is coupled to at least one resistor for generating a signal of a value which corresponds to a desired signal level of a signal to be added. A switch provided for supplying the signal of the value corresponding to the desired signal level to an output of the switch portion in response to a timing signal synchronized with the signal to be added.

Abstract: There is provided a color video camera apparatus (10) which includes an image sensor (11) having a plurality of pixel elements for converting an optical image into an electric image signal, a color filter (12) arranged on the image sensor and having a predetermined mosaic pattern of different colors including complementary colors, an image signal processing circuit (15) for processing the electric image signal to produce at least first and second color difference signals (2R-G) and (2B-G), a variable coefficient generator (20) for generating first and second coefficients (a) and (b) each of which is variable in dependence on the first and second color difference signals, first and second multipliers (19 and 22) for multiplying the first and second color difference signals respectively by the second and first coefficients, and first and second adders (18 and 21 ) for adding outputs of the second and first multipliers to the first and second color difference signals to generate objective third and fourth color

Abstract: A device for the compensation of a drop-out in a frequency-modulated video signal comprises an FM demodulator (4), a dropout detector (5), an A/D converter (6), and a code-word-insertion circuit (9). The code-word-insertion circuit (9) is constructed to insert a unique code-word instead of and at the location of a sample which is disturbed by a drop-out. After processing of the digitized video signal in a video-signal processing unit (12) the unique code-words are detected in a code-word detector (15) and compensation for these drop-outs is effected in a compensation unit (16).