DE1046358B - Arrangement to prevent the deletion of sound recordings in magnetic sound recorders - Google Patents

Description

GERMAN

The invention relates to an arrangement for preventing the unauthorized deletion of sound recordings for magnetic recorders.

In the known magnetic sound recorders, as is known, an automatically occurs with each recording previous deletion of any recordings on the sound carrier. In addition, there is the possibility even without making a new recording at the same time after rewinding the tape delete older records.

When using magnetic recorders to record important messages, e.g. B. in use in control centers of the energy supply, in command systems of coal mining, at the fire brigade or in railway operations, the recording is a document that cannot be used without special permission may be destroyed. It is not sufficient to use a lead seal with the known magnetic sound devices or other measures to protect the tape reels from unauthorized removal, since yes also destroys the recording, d. H. can be deleted if the sound carrier is not accessible from the outside is.

With the invention, the possibility is now created, a magnetic recorder for the aforementioned Purposes.

According to the invention, a contact element which runs synchronously with the sound carrier and which has a counter-contact takes along, used, which, however, remains in its position when the sound carrier is returned and thereby interrupts a circuit previously running via the contact and the mating contact thus making a locking device effective in the erasing and recording operations.

It is already known that, in magnetic recorders, one that runs synchronously with the recording medium To provide a band watch with two contact elements, but this arrangement serves to limit the rewinding process on cutting tables etc. for sound film purposes, to a certain scene or point of the film tape and allow the tape to be rewound to this point more quickly. With This device, however, the present object can not be achieved, since in the known case Triggering of the mechanism is dependent on the will of the operator and, on the other hand, an effect not done on the extinguishing circuit.

In the figures, an embodiment according to the invention is shown schematically, namely shows

Fig. 1 shows an operating diagram of the entire arrangement,

Fig. 2 the scale of a so-called tape watch.

In the figures, 1 and 2 indicate the dismantling and arrangement for prevention

the deletion of sound recordings

for magnetic recorders

Applicant:

VEB Funkwerk Köpenick,
Berlin-Köpenick, Wendenschloßstr. 154/158

Franz Saar, Berlin-Koepenick,

and Werner Vierich., Berlin-Friedrichshagen,

have been named as inventors

Take-up reel for the sound carrier 3, with 4 the drive motor and with 5 a drive belt for a Roll 6 designated. The roller 6 drives a device for displaying the via an intermediate gear 7 Tape run in the form of a well-known tape watch. The intermediate gear 7 is dimensioned so that, as Fig. 2 shows, when the entire sound carrier 3 is running, the display area of the tape watch 8 only closes about 95% has been passed through. This enables an exact display of the sound carrier process, even if if through the contact device described later the display area of the instrument 360 ° cannot be fully utilized.

With the small pointer of the band watch 8, which roughly shows the overall course of the sound carrier, is over a gear is coupled to a contact disc, which is provided with a driver, which in a normal Forward, d. H. not after a pre-run for the purpose of replaying a discussed part of the sound carrier, but in the case of a new recording, it rests against a mating contact on a second disk and takes it along while closing a circuit at the same time. In this circuit lies a blocking relay 14, which is attracted when the circuit is closed and with not shown Contacts complete the circuit for the erase and record heads, allowing normal operation is guaranteed. When the sound carrier is reversed, only the first disc is moved back while the second disc remains in its original position. This is where the contact between both disks open and the relay 14 drops out. The relay contact opens and a deletion or a new recording is made impossible. If you switch to the advance again, there is a new one

809 698/233

Recording is only possible again when the contact between the two panes is closed, d. H. if the before recorded part of the sound carrier has been played.

Provided that only the sound carrier reel is under a sealed or similar way secured cover arranged, so only the controls for rewind, playback, recording etc. and the watch is accessible or visible from the outside, so that unauthorized replacement is not possible, a magnetic sound device provided with the arrangement according to the invention can be used for documentary recording of conversations or reports. In contrast to the well-known train alarm memories exist in the event of ambiguity or longer instructions for the recipient the possibility of recording the conversations etc. to be listened to several times for better understanding.

If necessary, the arrangement according to the invention can be expanded to the effect that, for. Am Connection to a telephone set for a new call announcement, e.g. B. ringing a Alarm clock, during the playback process by means of appropriate switching measures on the device accelerated forward is switched, so that the device is ready to record as quickly as possible. While This shortened lead time means that the set remains locked even though the handset has already been picked up can. The telephone is only released when the original tape position is reached again and the tape recorder is switched to »recording«.

Claims (4)

Patent claims: Using one with a magnetic sound carrier synchronously running contact element that takes along a counter contact as a locking device for the deletion and recording process, in which the Counter-contact remains in its position and thereby a previously on the contact element and the mating contact is interrupted. 2. Arrangement for use according to claim 1, characterized in that a tape watch (8) is provided for displaying the audio carrier sequence, the pointer indicating the overall sequence of the audio carrier is coupled to a contact disc which has a driver which engages in a mating contact takes a second disc with a normal course of the sound carrier. 3. Arrangement according to claim 2, characterized in that the tape watch via an intermediate gear (7) is coupled to the sound carrier drive, the transmission ratio of which is selected in this way is that when the entire sound carrier runs out, the display area of the tape watch (8) only is about 95% through. 4. Arrangement according to claim 2 and 3, characterized in that by the with the sound carrier drive coupled contact and the mating contact that was only taken along during the advance Switch is in a circuit with a blocking relay (14), the contact of which the Erase and record head locks and releases according to the operational sequence. Considered publications:
German patent specification No. 899 427. 1 sheet of drawings 809 698/233 12.58