Abstract: The invention relates to a security material comprising a carrier and at least one photochromic Protein and/or a mutein of a photochromic protein. The security material is characterized in that it comprises at least one irreversible photosensitive layer on the carrier, and the at least one photochromic protein and/or mutein is contained at least in the at least one photosensitive layer and/or in an optional additional layer. The inventive security material is also characterized in that it is highly forgery-proof, the photochromic biomolecule cannot be removed therefrom in a usable form, and the photochromic biomolecule does not need to be supplied to a large group of clients.

Abstract: The invention relates to a security material comprising a carrier and at least one photochromic Protein and/or a mutein of a photochromic protein. The security material is characterised in that it comprises at least one irreversible photosensitive layer on the carrier, and the at least one photochromic protein and/or mutein is contained at least in the at least one photosensitive layer and/or in an optional additional layer. The inventive security material is also characterised in that it is highly forgery-proof, the photochromic biomolecule cannot be removed therefrom in a usable form, and the photochromic biomolecule does not need to be supplied to a large group of clients.

Abstract: A method of and apparatus for editing half-inch tape used for home recording of video material applies pulse-width modulation to prerecorded synchronizing pulses in predetermined time intervals. The interval is started with an eleven-bit header that is compatible with that of a commercially available system known as the VASS system. Time blocks are then encoded by pulse-width modulation with information identifying the particular recording session and the number of elapsed seconds minutes and hours since the beginning of the session. A check code completes the modulation during the interval for television systems such as PAL and SECAM that are adapted for fifty-Hz operation. For systems such as NTSC that operate at sixty Hertz, a ten-bit dummy code is added to complete the two-second interval. The code is entered without writing over the leading edge of the prerecorded synchronizing pulse, allowing the timing of those pulses to continue without interruption.

Abstract: A method for transferring an information code onto the synchronization track of a video tape is described. The code is recorded during intervals between synch pulses by adding code pulses of the same magnetization as the recorded synch pulses to the synchronization track. The code pulses, at least in part, overlap the synch pulses with the length of the code pulses representing binary values. With this technique, an erasure of pre-recorded synch pulses is not required. A recording device is used that contains a generator of code pulses and at least two timing elements which are set when a synch signal is produced in response to a detected synch pulse. One of the timing elements operates a mode changeover switch and the other activates the code pulse generator. A reading device is used and contains two threshold detectors which detect two synch signals, representative of the beginning and end of the recorded synch signals. At least one timing element is started at the beginning of the synch signal.

Abstract: A method for transferring an information code onto the synchronization track of a video tape is described. The code is recorded during intervals between synch pulses by adding code pulses of the same magnetization as the recorded synch pulses on the synchronization track. The code pulses, at least in part, overlap the synch pulse with the length of the code pulses representing binary values. With this technique, an erasure of pre-recorded synch pulses is not required. A recording device is used that contains a generator of code pulses and at least two timing elements which are set when a synch signal in response to a detected synch pulse is produced. One of timing elements operates a mode changeover switch and the other activates the code pulse generator. A reading device is used and contains two threshold detectors which detect two synch signals, representative of the beginning and ending of recorded synch signals. In response at least one timing element is started at the beginning of the synch signal.

Abstract: An automotive vehicle has a horn which is mounted on the vehicle chassis. The horn is connected with the vehicle battery by a first conductor. A switch for the horn is mounted on the steering wheel and is connected with the horn via a second conductor. The second conductor is divided into two sections of which one is rotatable with the steering wheel and the other is fixed on the chassis. A control system for controlling electrical components of the vehicle other than the horn has a transmitting unit which is mounted on the steering wheel. The transmitting unit has an output which is connected with the rotatable section of the conductor leading from the horn switch to the horn. The control system further includes a receiving unit which is mounted on the vehicle chassis and has an input connected with the fixed section of this conductor. When the operator of the vehicle presses a switch in order to activate an electrical component, input signals are delivered to the transmitting unit.