DE2906836A1 - Tape recorder recorded position indication - has sub-audio code signals recorded onto tape for higher frequency replay during fast forward wind rewind - Google Patents

Abstract

The tape recorder has fast forward and rewind facilities. Between recorded passages (4, 5) on the tape, identification signals (6, 7, 8) are recorded so that passages may be easily found during fast forward and rewind runs. The identification signal format is for a code (8) to be between satellite signals (6, 7). During fast forward and rewind the format is recognised when picked up by the record/replay head and fed to Schmitt trigger and flip-flop based circuitry. At record/replay speeds, the code signals are below the audio band and are transposed several octaves during fast forward and rewind operations.

Description

summary

It becomes an information recording and reproducing apparatus proposed for a magnetic recording tape in which predetermined to be found Recording sections coded identification signals between the recording sections are recorded and from the Xenn signals when fast forward and backward of the magnetic recording tape in a magnetic head, the identification signals corresponding.-and AC voltages that can be evaluated to find predetermined recording sections be induced.

Background Art The present invention relates to an information recording and information reproducing device according to the preamble of claim 1.

To. Finding predetermined recording sections become such Information recording and reproducing devices usually nit provided a circuit arrangement, which the pauses between the individual recording sections detects with the help of ciaes noise detector.

Such information recording and reproducing devices have some drawbacks.

This is how the circuitry for pause detection speaks - uch-on parts of recording sections that have small pauses and so that have the noise level required to respond to the noise detector. Further With this circuit arrangement, the recording sections following the pauses can be used cannot be recognized.

The invention and its advantages These disadvantages are addressed in accordance with the present invention Invention avoided that on the magnetic recording tape between Identifying signals are recorded in the individual recording sections are different Recording sections different identification signals are upstream and from the Identification signals during fast forward and reverse movement of the magnetic recording tape in a magnetic head the identification signals corresponding and predetermined for finding Recording sections evaluable alternating voltages are induced.

The reliability with which the predetermined recording sections can be found, according to an advantageous development of the invention thereby increase significantly that the identification signals from code signals and satellite signals are composed, the satellite signals before and after the code signals are and in terms of frequency with slow tape feed for recording and playback below the audio frequency range of the information recording and reproducing device lie and different recording sections differently coded code signals are upstream and from the code signals when fast forward and backward of the magnetic recording tape in a magnetic head the code signals appropriate and AC voltages that can be evaluated for finding predetermined recording sections be induced.

A simple coding and evaluation of the code signals can be achieve according to an advantageous embodiment of the invention in that the Code signals are formed by length-coded signals of the same frequency.

A reliable evaluation of the identification signals with simple means to find predetermined recording sections can according to an advantageous Formation of the invention can be achieved in that for the evaluation of the Identification signals for finding predetermined recording sections in the fast Induced forward and backward movement of the magnetic recording tape in the magnetic head AC voltages the output signals of the magnetic head via a low-pass filter, a Schmitt trigger, a mono-flop and a flip-flop to the first input of an AND gate and via a high-pass filter and via a second Schmitt trigger connected downstream of this high-pass filter to the second input of the AND gate and the output of the AND gate a pulse counter is connected downstream, which has a programmable comparison stage with one the information recording and reproducing apparatus in dependence from the count of the pulse counter controlling switching stage is connected.

The advantages of the present invention are in particular that that according to the invention without any special additional effort.

Recording tape automatically from any position in the starting position of a predetermined. Recording portion are brought can. The application of the Identification signals when recording both at the manufacturer of cassettes and at the user with suitable simple Additional devices.

An information recording and reproducing apparatus according to the present invention thus has a significantly improved compared to conventional devices of this type Ease of use.

DRAWING The invention is explained in more detail below with reference to FIGS. 1 to 6 explained.

FIG. 1 shows the structure of an information recording system according to the invention and information reproducing device.

In Figure 2, those recorded on a magnetic recording tape are Signals, namely the individual recording sections and those between them recorded identification signals, which consist of satellite signals and code signals, shown.

In Figures 3 to 6 are the starting sipaale, which on individual Switching stages of the information recording and reproducing device according to of Figure 1 occur.

In Figure 1, 1 shows the magnetic recording tape which is between the tape wraps 2 and 3 during the fast forward and back Rewind and during the slow tape advance for recording and playback. and is moved, wherein the tape lap 2 and 3 alternately as a take-up and as Unwind work.

The signals recorded on the magnetic recording tape 1 induce alternating voltages in the magnetic head K, those from the magnetic head K connected downstream Levels are evaluated.

The output signals of the magnetic head K are sent to the low-pass filter T and given the high pass H.

The signals assigned to the satellite pass through the low-pass filter T. AC voltages to the Schmitt trigger S1. From the output signals of the Schmitt trigger S1 the mono-flop MF is switched, whereby the time constant of the mono-flop is greater is than the distance between the output pulses of the Schmitt trigger S1, which comes from a satellite signal are formed. At the end of a satellite signal, the mono-flop MF switches after expiry its time constants back to its initial state and switches that of the pulse trailing edges controlled flip-flop FF, so that during the pauses between the satellite signals A switching voltage is applied to the AND element U connected downstream of the flip-flop FF.

Thus, the code signals occurring between the satellite signals arrive via the high-pass filter H, the Schmitt trigger S2 and the AND element U to the counter Z. The respective status of the counter Z is in the with the control panel B, which for example contains an input keyboard, programmable comparison stage V with the one in the Comparison level V entered during programming Value compared. Depending on the status of the counter Z, the one connected to the comparison stage V controls Switching stage ST the information recording and reproducing device in its modes of operation. Thus, the magnetic recording tape 1 with a predetermined Drawing section by switching the operating modes faster forward and faster Rewind and stop brought to the starting position for playback.

In FIG. 2, over the length of the tape or over time, the signals for example, the corresponding magnetization of the magnetic recording tape or the alternating voltages induced by this in the magnetic head. Included Figures 4 and 5 show two separate recording sections. Between each Recording sections 4 and 5 show the identification signals. The identification signals consist of the code signal 8 and the code signal 8 upstream and downstream Satellite signals 6 and 7. The satellite signals 6 and 7 are below in terms of frequency the audio frequency range of the information recording and reproducing device, so that they recorded from the rest on the magnetic recording tape Signals are clearly distinguishable.

The code signal 8 is coded in length as a same frequency Signal formed. It is also conceivable between the satellite signals 6 and 7 to arrange several similar code signals & in order to improve the reliability of a to improve such a circuit arrangement. The code signals 8 are used to achieve a high immunity to interference of the circuit arrangement, preferably in terms of frequency in the audio frequency range of the information recording and reproducing device lie. In addition to the coding described, other types of coding are also possible.

The satellite signals 6 and 7 ensure proper activation and control of the circuit arrangement. At the end of the satellite signals 6 and 7 are Arranged pauses which are greater than the time constant of the mono-flop MF according to Figure 1, so that the AND gate U via the flip-flop FF has been long enough is keyed before the occurrence of the code signals 8 and thus error-free Evaluation of the code signals 8 is guaranteed.

In the figures 3 to 6 are now the identification signals according to the figure 2 assigned output signals of individual switching stages of an information recording - and information reproducing device shown in FIG.

Figure 3 shows the output pulses of the Schmitt trigger S The output pulses of the Schmitt trigger S1 are carried out by the satellite signals via the low-pass filter T. 6 and 7 triggered and are used to activate the circuit arrangement for evaluation the code signals 8 occurring between the satellite signals 6 and 7 are used.

The output signals of the Schmitt trigger S1 trigger the Schmitt trigger S1 downstream mono-flop MF whose time constant is greater than the distance the output signals of the Schmitt trigger Sl. Step at the exit of the mono-flop MF while the pulses shown in Figure 4 on From the trailing edges of the output pulses of the mono-flop MF, the flip-flop FF is triggered, with the output of the elip-flop FF the pulses shown in Figure 5 occur and to an input of the AND gate U according to the figure 1 are performed.

The output signals of the Schmitt trigger S2 are shown in FIG. The output signals of the Schmitt trigger S2 are from the high-pass filter H according to The code signals 8 carried out in FIG. 1 according to FIG. 2 are triggered. The output signals of the Schmitt trigger S2 are via the second input of the AND gate U and the AND element U, at whose first input the output signals of the flip-flop FF are present, to the counter Z for evaluation, so that the information recording and Information reproducing device controlled in the desired manner in its functions will.

Cassette recorders, for example, can be used in the manner according to the invention and video recorders to increase their convenience and improve their Train application possibilities. The identification signals can be recorded on a cassette recorder evaluate with the already existing magnetic head, the audio head. With one, for example video recorders working according to the helical scan method can record the identification signals recorded on the soundtrack.

Information recording and info designed according to the invention ration playback devices for magnetic recording tapes offer compared to conventional Information recording and reproducing devices the possibility of predetermined Record portions from any position on the magnetic recording tape to find out in the shortest possible time and to bring it into playback position, without the need to put the magnetic recording tape in its Bring the start or end position, from there to the individual recording sections to count one after the other.

It is well within the scope of the present invention, others too Information recording and reproducing apparatus using other recording media use as magnetic recording tapes in the manner according to the invention.

Claims (4)

Information recording and reproducing apparatus claims IjJ information recording and reproducing apparatus with a magnetic one Recording tape, which is used for recording and reproducing information with can be moved with a slow tape feed and has a fast forward and reverse movement, characterized in that on the magnetic recording tape (1) between the individual recording sections (4, 5) recorded identification signals (6, 7, 8) are arranged in front of different recording sections with different identification signals and from the identification signals during fast forward and reverse movement of the magnetic Recording tape (1) in a magnetic head (K) the identification signals (6, 7, 8) corresponding and AC voltages which can be evaluated for finding predetermined recording sections (4, 5) be induced. 2. Information recording and reproducing device according to Claim 1, characterized in that the identification signals (6, 7, 8) consist of code signals (#) and satellite signals (6, 7) are composed, the satellite signals (6, 7) the code signals (8) are upstream and downstream and in terms of frequency at slow speeds Tape feed for recording and playback below the audio frequency range of the Information recorder and information reproducing device are and different Recording sections differently coded code signals (8) are arranged upstream and of the code signals (8) during fast forward and reverse movement of the magnetic recording tape (1) In a magnetic head (K) corresponding to the code signals (8) and to be found predetermined recording sections (4, 5) induced evaluable alternating voltages will. 3. Information recording and reproducing device according to Claim 2, characterized in that the code signals (8) of in length coded signals of the same frequency are formed. 4. Information recording and reproducing device according to claims 1 to 3, characterized in that for the evaluation of the identification signals (6, 7, 8) to find predetermined recording sections when fast forwarding and induced return of the magnetic recording tape (1) in the magnetic head (K) AC voltages the output signals of the magnetic head (K) via a low-pass filter (T), a Schmitt trigger (S1), a mono-flop (MF) and a flip-flop tFF) to the first Input of an AND gate (U) and a high-pass filter (H) and this high-pass filter (H) downstream second Schmitt trigger (S2) to the second input of the AND element (U) and the output of the AND element (U) is followed by a pulse counter (Z) is, which has a programmable comparison stage (V) with an information recording and information reproducing device depending on the count of the pulse counter (Z) controlling switching stage (ST) is connected.