Signal recording and playback apparatus for location monitoring which records prior to sensor input
First Claim
1. A magnetic recording and playback apparatus for recording and playing back input signals on a magnetic recording medium comprising:
- a sensor provided externally of a body of the magnetic recording and playback apparatus for outputting trigger signals under prescribed conditions;
control means for controlling conveyance of the magnetic recording medium to stop recording by stopping conveyance of the magnetic recording medium in a standby state while waiting for the trigger signals to be output and to start continuous recording by starting continuous conveyance of the magnetic recording medium at a point in time when the trigger signals are output; and
signal preserving means for temporarily preserving the input signals and outputting the preserved input signals in order of preservation,said signal preserving means preserving the input signals in order of input while simultaneously outputting the preserved input signals in the order of preservation at any time and repeatedly performing overwriting with new input signals after an amount of preserved input signals exceeds storage capacity,recording of the preserved input signals starting by starting continuous conveyance of the magnetic recording medium at the point in time when the trigger signals are output.
0 Assignments
0 Petitions
Accused Products
Abstract
A video camera is connected to a video signal amplifier through a video signal input terminal. The video signal amplifier is connected to the input side of an image memory through an A/D converter which converts analog video signals into image data which are digital signals. The image memory is provided with a semiconductor memory for storing video signals converted into digital signals. Thus, it becomes possible to continuously record images from before the opening of a door until after the opening of the door and to thus obtain a magnetic recording and playback apparatus of high monitoring effects.
-
Citations
24 Claims
-
1. A magnetic recording and playback apparatus for recording and playing back input signals on a magnetic recording medium comprising:
-
a sensor provided externally of a body of the magnetic recording and playback apparatus for outputting trigger signals under prescribed conditions; control means for controlling conveyance of the magnetic recording medium to stop recording by stopping conveyance of the magnetic recording medium in a standby state while waiting for the trigger signals to be output and to start continuous recording by starting continuous conveyance of the magnetic recording medium at a point in time when the trigger signals are output; and signal preserving means for temporarily preserving the input signals and outputting the preserved input signals in order of preservation, said signal preserving means preserving the input signals in order of input while simultaneously outputting the preserved input signals in the order of preservation at any time and repeatedly performing overwriting with new input signals after an amount of preserved input signals exceeds storage capacity, recording of the preserved input signals starting by starting continuous conveyance of the magnetic recording medium at the point in time when the trigger signals are output. - View Dependent Claims (2, 3, 4, 5)
-
-
6. A magnetic recording and playback apparatus for recording and playing back input signals on a magnetic recording medium comprising:
-
a sensor provided externally of a body of the magnetic recording and playback apparatus for outputting trigger signals under prescribed conditions; control means for controlling conveyance of the magnetic recording medium to perform intermittent recording by intermittently conveying the magnetic recording medium in a standby state while waiting for the trigger signals to be output and to perform continuous recording by starting continuous conveyance of the magnetic recording medium at a point in time when the trigger signals are output; signal preserving means for temporarily preserving the input signals and outputting the preserved input signals in order of preservation; and switching means for switching a route of the input signals such that the input signals are recorded on the magnetic recording medium in the standby state prior to preservation in said signal preserving means and the preserved input signals from said signal preserving means are recorded on the magnetic recording medium at the point in time when the trigger signals are output, said signal preserving means preserving the input signals in order of input while simultaneously outputting the preserved input signals in the order of preservation at any time and repeatedly performing overwriting with new input signals after an amount of preserved input signals exceeds storage capacity, recording of the preserved input signals starting by starting continuous conveyance of the magnetic recording medium at the point in time when the trigger signals are output. - View Dependent Claims (7, 8, 9, 10)
-
-
11. The magnetic recording and playback apparatus for recording and playing back input signals on a magnetic recording medium comprising:
-
a sensor provided externally of a body of the magnetic recording and playback apparatus for outputting trigger signals under prescribed conditions; control means for controlling conveyance of the magnetic recording medium to perform intermittent recording by intermittently conveying the magnetic recording medium in a standby state while waiting for the trigger signals to be output and to perform continuous recording by starting continuous conveyance of the magnetic recording medium at a point in time when the trigger signals are output; and signal preserving means for temporarily preserving the input signals and outputting the preserved input signals in the order of preservation, said signal preserving means preserving the input signals in order of input while simultaneously outputting the preserved input signals in the order of preservation at any time and repeatedly performing overwriting with new input signals after an amount of preserved input signals exceeds storage capacity, recording of the preserved input signals starting by starting continuous conveyance of the magnetic recording medium at the point in time when the trigger signals are output. - View Dependent Claims (12, 13, 14, 15)
-
-
16. A signal recording and playback apparatus for recording and playing back input signals on a signal recording medium, comprising:
-
a sensor provided externally of a body of the signal recording and playback apparatus for outputting trigger signals under prescribed conditions; control means for controlling a recording operation on the signal recording medium to stop recording by stopping a recording operation on the signal recording medium during a standby state while waiting for the trigger signals to be output and to start continuous recording on the signal recording medium at a point in time when the trigger signals are output; and signal preserving means for temporarily preserving the input signals and outputting the preserved input signals in order of preservation, said signal preserving means preserving the input signals in order of input while simultaneously outputting the preserved input signals in the order of preservation at any time and repeatedly performing overwriting with new input signals after an amount of preserved input signals exceeds storage capacity, recording of the preserved input signals on the signal recording medium starting at a point in time when the trigger signals are output. - View Dependent Claims (17, 18)
-
-
19. A signal recording and playback apparatus for recording and playing back input signals on a signal recording medium, comprising:
-
a sensor provided externally of a body of the signal recording and playback apparatus for outputting trigger signals under prescribed conditions; control means for controlling a recording operation on the signal recording medium to perform intermittent recording on the signal recording medium during a standby state while waiting for the trigger signals to be output and to perform continuous recording on the signal recording medium at a point in time when the trigger signals are output; signal preserving means for temporarily preserving the input signals and outputting the preserved input signals in order of preservation; and switching means for switching a route of the input signals such that the input signals are recorded on the signal recording medium in the standby state prior to preservation in said signal preserving means and the preserved input signals from said signal preserving means are recorded on the signal recording medium at the point in time when the trigger signals are output, said signal preserving means preserving the input signals in order of input while simultaneously outputting the preserved input signals in the order of preservation at any time and repeatedly performing overwriting with new input signals after an amount of preserved input signals exceeds storage capacity, recording of the preserved input signals starting on the signal recording medium at the point in time when the trigger signals are output. - View Dependent Claims (20, 21)
-
-
22. The signal recording and playback apparatus for recording and playing back input signals on a signal recording medium, comprising:
-
a sensor provided externally of a body of the signal recording and playback apparatus for outputting trigger signals under prescribed conditions; control means for controlling a recording operation on the signal recording medium to perform intermittent recording on the signal recording medium during a standby state while waiting for the trigger signals to be output and to perform continuous recording on the signal recording medium at a point in time when the trigger signals are output; and signal preserving means for temporarily preserving the input signals and outputting the preserved input signals in order of preservation, said signal preserving means preserving the input signals in order of input while simultaneously outputting the preserved input signals in the order of preservation at any time and repeatedly performing overwriting with new input signals after an amount of preserved input signals exceeds storage capacity, recording of the preserved input signals starting on the signal recording medium at the point in time when the trigger signals are output. - View Dependent Claims (23, 24)
-
Specification