Abstract: Security information notification system furnished with sensor for detecting occurrence of an abnormality, and a control unit that receives an abnormality detection signal from the sensor and issues first alarm information to a user, and then, after a set period has elapsed since issuing the first alarm information, issues second alarm information that is more detailed than the first alarm information to the user. The control unit has a transmission interrupt function that by user operation within the set period stops issuance of the second alarm information.

Abstract: A signal processing apparatus including a write controller. This write controller specifies a start position of an effective time period of each field, based on an ID signal superimposed over lines 15 to 18 of an odd numbered field video signal and over lines 177 to 280 of an even numbered field video signal. The video signal at and following a specified start position is written to a memory. The video signal written on the memory is read out by a read controller. As a result, corresponding videos are displayed on the monitor.

Abstract: A recording apparatus includes a recording medium 4 formed with a plurality of unit memory areas thereon. When no alarm signal is generated, a recording circuit 3 writes image signals into the unit memory areas in a cyclical manner. When the alarm signal is generated, the recording circuit 3 overwrites the image signals into the unit memory areas, which are intermittently present. Although a frame rate of the image signals at a time of writing is always 10 fps irrespective of the alarm signal, one portion of the image signals written before generating the alarm signal is deleted by the overwriting, which is after generating the alarm signal. The frame rate of the image signal that is remained as a result of not being overwritten decreases to 2 fps.

Abstract: In tracing a tape with a signal recording head to form tracks having digital data recorded thereon, a plurality of tracks provide each of blocks, and a usual playback data area NA and trick playback areas TH and TL are arranged on each of the tracks included in each block. The trick playback areas are enlarged to provide increment areas TA with a decrease in the bit rate of usual playback data. In recording image data as to a plurality of programs on a tape conjointly, signal recording tracks are formed on the tape, and a usual playback data area and a trick playback data area are formed on each of the tracks or on one track per plurality of tracks, as arranged longitudinally of the track, whereby the image data as to programs A to D is conjointly recorded on the same tape.