DE3929245C2 - - Google Patents

Description

The property right is a facility for continuous recording of radio-relevant data with a slow running Tape recorder.

Such devices are known for language documentation (see brochure from ASC electronic, Mösbach, AS 4200). It is intended, by means of the recently introduced radio data system (see radio show 1986, 1, pp. 43-47) also warnings for the population, e.g. B. by controlling the activation of sirens. As part of the deliberations on this, the task arose, the sending or the receipt of RDS data relevant to warnings in warning radio centers to document.

The announcement of the transmission of warning-relevant RDS data in the RDS group 9A, as in that published by the EBU System specification EBU-Technical Center-TEC 3244 E, Brussels, March 1984, is announced in RDS Group 1A, which announced transmitted once every second in the continuous RDS data stream becomes. These two groups must therefore be from the RDS Data stream can be pulled out and recorded.

Extracting and recording traffic announcements from the Broadcasting is known per se from DE 34 00 368 A1. The However, these announcements are only recorded on a case-by-case basis. The invention was based on the object of a continuous recording operation during a 24 hour surveillance period enable.

The device according to the invention, which solves the task, is characterized by the features of claim 1.  

The invention is explained in more detail with reference to a block diagram of an exemplary embodiment shown in FIG. 1.

A connected to an antenna 1 VHF receiver 2 has an RDS decoder 3 , the warning radio-relevant output data to be recorded in a tape recorder 4 , which is connected via a device 5 to the RDS decoder 3 . The tape recorder is said to be in continuous 24-hour operation. The Bandge speed of the tape 13 is according to the invention in the order of 11 to 13 mm per second, more precisely at 11.9 mm per second.

The data transfer rate in the RDS system is approximately 1200 baud, more specifically 1187.5 bits per second, i.e. H. for the transfer of the 104 bits belonging to an RDS group are approximate 87.6 ms available. The duration of a bit corresponds to the RDS System with the duration of an 840 Hz oscillation. The upper limit frequency that would have to be recorded on the tape therefore not significantly above the frequency of 840 Hz. At The band speed chosen according to the invention can be frequencies from 300 to 3000 Hz can be recorded.

Of the 104 bits, 64 bits are used for information transmission and Synchronization and 40 bits of error correction options.

For the documentation, only the information is recorded even important. A frequency shift Keying selected, but if information is missing and for some Digital value recorded a frequency of 2.1 kHz on the tape while the other digital value is recorded by recording one Frequency of 1.3 kHz is shown. To terminal-compatible data the information is written in ASCII code, d. H. each character contains, in addition to the one encoded with 8 bits Sign a start and a stop bit.

The device 5 at the output of the RDS decoder 3 has a shift register 6 , in which the information belonging to a group is read in parallel. For this purpose, the shift register 6, with its inputs connected in parallel, is located at the outputs of a transcoder 7 in the RDS decoder 3 , which, if necessary, transmits the information coded in the RDS telegram to the ASCII code after error correction has been carried out. If the warning radio sensor 8 in the RDS decoder 3 detects warning-relevant information after the 104 bits of a group have been completely read in, then an output pulse from the warning radio sensor 8 opens a gate 9 in the output of the shift register 6 . Via this gate 9 , the content of the shift register is serially fed to the control input of a frequency generator 10 which can be switched between the frequencies 1.3 kHz and 2.1 kHz. The frequency generator 10 is connected to the read / write amplifier 11 of the tape head 12 in the tape recorder 4 . When the gate 9 is open, the shift register 6 is read out at a clock frequency of 1.2 kHz, that is to say, on the tape 13 , an oscillation of 1.3 kHz per bit is recorded in the H state of the information, and one and a half oscillations of the frequency in the L state 2.1 kHz.

The information to be recorded can be monitored on the monitor 14 .

Legend

1 antenna
2 FM receivers
3 RDS decoders
4 tape recorder
5 connection device
6 shift registers
7 transcoder
8 warning radio sensor
9 gate switching
10 frequency generator
11 read / write amplifiers
12 head
13 tape
14 monitor

Claims (1)

Device for the continuous recording of warnfunkrelevan th data on a slow-moving tape, characterized in that the tape speed is in the range of 12 mm / second, that the wiring of the tape head ( 12 ) of the tape recorder comprises a switch ter ( 9 ) by a RDS decoder ( 3 ) is opened as soon as the warning radio sensor ( 8 ) detects relevant radio data in the RDS telegram that the circuitry of the sound head ( 12 ) also includes a frequency generator ( 10 ) that can be switched between two frequencies above 300 Hz and below 3 kHz that the control input of the frequency genes rators (10) (9) is connected to the serial output of a shift register (6) via the switch that the parallel peeled th inputs of the shift register (6) in turn connected to information outputs of the RDS decoder (3 ) are connected and that clock pulses with a frequency of 1.2 kHz are present at the clock input of the shift register.