Abstract: A video system which includes a recorder/player and cassette units adapted to be inserted into the recorder/player with the cassette units including a storing medium and with the cassette units being provided with memory units. The respective memory units are independent of the storing medium and are operable, in response to the cassette being inserted into the recorder/player, to be electrically connected to a read/write unit therein. The memory unit is accommodated in a block member adapted to be mounted in an opening of a standard cassette accommodating and erasure prevention tab, with the recorder/player being provided with a device for contacting the memory unit in such a manner that it can operate compatibly with the standard cassettes with both and without memory units.

Abstract: An aerial circuit comprises a first antenna in connection with an impedance, which is a "negative impedance", whereby a broad frequency range is achieved. The "negative impedance" is based on a second antenna similar to the first antenna, whereby the resulting aerial impedance is zero for all frequencies. A corresponding ferrite or loop aerial system is advantageously usable as a stationary system instead of an antenna of the long wire type, and the signal to noise ratio is better than with conventional ferrite antennas.