DE4214367A1 - Recording and playback appts. for digitised video still frame data and audio data - records video and audio data in segments of tape that are related using recorded index data - Google Patents

Abstract

A digital audio tape recorder system has two channels with a pair of audio inputs (TR, TL) and a video input (TV) for still frame signals. The video input is digitised (6) and converted into serial form (9) for transmission through a selector (5) to be recorded onto the tape (12) in segments. The audio signals are digitised (1,2) and also passed through the selector to be recorded in segments that relate to those of the video signals. Sub-information is provided as an index to the recorded data. Playback is effected via a similar processing chain, with a selector (15) and A/D converters (16-19). ADVANTAGE - Allows video still frame data and audio digital data to be recorded in DAT system.

Description

The invention relates to a method and to a device for drawing and reproduction of information for preferred use e.g. B. in a digital audio tape recorder (hereinafter referred to as DAT), which is able to share two or more different signal series record and the recorded signals according to the respective Play series separately.

A DAT is commonly used for sound recording and playback det. Here, audio signals are converted into digital signals in order to be based on egg to be recorded on a magnetic tape. The one on the magnetic tape recorded digital signals are used to play the original sound in Converted audio signals back.

In the known DAT system, those converted into digital signals Audio signals recorded on the magnetic tape can be used as sub-information  error correction information, for example parity, on the magnet tape can be recorded. The recorded information can then easier to find again, even if during playback (Play back) should have errors. The original sound is played back thus not only more true to the sound, but also with a much lower one Noise level.

Some DATs can be switched between two operating modes. This includes a two-channel mode and a four-channel mode. With the two channel mode are two different types of audio signals in two separate channels recorded on the magnetic tape, while at the Four-channel mode four different types of audio signals are drawn, in four different channels on the magnet tape.

In two-channel mode, there are different types of audio signals referenced by two loudspeakers at the front right and front left to a listener, are played in the respective channels on the Magnetic tape recorded, while in four-channel mode four types of audio signals in the respective channels on the magnetic tape net, which are reproduced with the help of four speakers, which, be moved to a listener, front right, front left, back right and back are positioned on the left.

In addition, a DAT system is known which is used in the four-channel mode Au recorded diosignals in two channels, while in the remaining two Ka channel still video signals are recorded. When playing who the audio signals and the video signals from the same magnetic tape at the same time reproduced.

In this system, e.g. B. two image memory available, each for storage a still image video signal for one image. When recording operation, the video signal for one picture is converted into a digital signal delt, with the help of an analog / digital converter, before it on the Magnetic tape is recorded. The digitally converted signal becomes next written in serial form in one of the two image memories, and  over a predetermined period of time (hereinafter referred to as the first period of time records). The digital video signal for a picture is then extracted from the picture read out memory, namely over a predetermined period of time after hereinafter referred to as the second time period, and which is sufficiently longer than the first time period, in this way the two channels on the magnet band to describe.

At this time, the Au input simultaneously with the video signal converted diosignals into digital signals with the help of another A / D converter delt to be recorded on the magnetic tape in the remaining two channels to become net. The video signal for an image and the audio belonging to it Signals that are used, for example, to clarify images are thus simultaneously stored on the magnetic tape.

Fig. 1 shows the recording format on the magnetic tape which contains the video signal and the audio signals.

During playback (playback), the digital video signal for an image, the has been read from the magnetic tape, first in serial form in one of the Image memory written, over the second period. After that the video signal for one picture is read out of the picture memory, namely over the first period. The video signal read from the frame buffer is then returned to the original by means of a digital / analog converter analog video signal converted to be reproduced in this way can.

The digital audio signals, which are simultaneous with the digital video signal from Magnetic tape can be read out using a digital / ana log converter for the purpose of reproduction in the original analog signals transformed back. At the time of playback of the still image video signal for an image, the audio signals are also reproduced with which, for. B. that Still picture is explained.

In the conventional DAT system described above, in which the video signal and the audio signals are recorded simultaneously, but it is not possible to re-select selected video signals or selected audio signals or  to be recorded repeatedly or subsequently.

The invention has for its object a method and a device for information recording and playback to create pairs of Vi To be able to record deodorant and audio signals in such a way that a selective post-run drawing is possible, and that of individual signals of a pair, one Couple yourself or other signals.

The invention provides a sequential recording device Record information on a main information record area of a magnetic tape is available, the information still picture formation, paired with associated audio information, to form a Contains recording segments with:

• Image recording means which only record the still image information, namely segment by segment or in the respective segments on the Magnetic tape at discrete spatial intervals,
• Audio recording means which only record the audio information, and segment by segment or in the respective segments on the Magnetic tape at discrete spatial intervals, but opposite the image recording means work at different times, and
• - Sub-information recording means containing a segment-indexing sub-information on a sub information recording area of the magnet tapes, simultaneously with the recording operation of the Image recording medium or audio recording medium, depending on through which is first recorded on the magnetic tape, the seg ment-indicating sub-information contains an index, with the help of which the successive recording media on the magnetic tape locate the recording position.

In accordance with the invention is first, for example, with the help the image recording means, a series of still image information on the Magnetic tape recorded at discrete spatial intervals, the Series of still image information represents a plurality of images. Here who which the images are each inscribed in predetermined segment areas lie one after the other on the magnetic tape. At the same time, a segment indexing sub-information in a sub-information recording area  recorded on the magnetic tape using the sub-information Recording media.

Then a series of audio information in discrete spatial In intervals on the magnetic tape, segment by segment in the not yet described segment areas of the magnetic tape. This Au Audio information is assigned to the image information recorded first. The Audio information is recorded using audio recording medium and using the segment-indicating sub-information, ins especially using the index contained in it, which is in the Subinforma tion recording area of the magnetic tape is recorded. The audioin formation can therefore be performed using the segment-indexing subin Assign formation to the image information. In other words Still picture information for a picture and the associated audio information in Longitudinal direction of the magnetic tape one behind the other in a segment ge saves. The same recording result can also be obtained if the audio recording medium is put into operation before the Recording operation of the image recording means takes place.

This makes it possible, for. B. new still picture information in any loading to record the rich of the magnetic tape, e.g. B. where still picture information tion for a picture is already saved, or new audio information has to be added draw, in any area of the magnetic tape where z. B. Audioin formation is already recorded.

As already described above, with the device according to the invention e.g. B. first a series of still image information using the image recording Means are recorded, the series of still image information represents a plurality of images recorded on the magnetic tape under discreet th spatial intervals are recorded. At the same time the seg ment-indicating sub-information in the sub-information recording area recorded on the magnetic tape by the recording operation of the sub-information recording means. Then the recording area drove the audio recording medium started, and with a time delay to demje some of the image recording media. This is a series of audio information tion recorded on the magnetic tape at discrete spatial intervals  net, the audio information of the first recorded still picture information tion is assigned. The audio information is recorded under Ver using the recorded segment-indexing sub-information as In dex. The still picture information for a picture and the associated audio information tion are therefore in a common segment and lie in this Segment in the longitudinal direction of the magnetic tape one behind the other. It is therefore possible Lich, new still image information in any area of the magnetic tape to record where e.g. B. Still picture information for a picture already exists or new audio information in any area of the magnetic tape to record where z. B. be already recorded audio information finds.

The invention further provides a recording device for recording of information available in the main information in a main information mations recording area of a magnetic tape and sub-information in egg nem sub information recording area of the magnetic tape be, the sub-information when reproducing the main information ei provides an index and the main information consists of information units, each of which is still picture information paired with associated audio information tion, included, with:

• - Image recording means that only the still image information for the respective units of information in the main information recording area record the magnetic tape at discrete spatial intervals,
• - Audio recording media that only contain the audio information for the respective Information units in the main information recording area of the Record magnetic tape at discrete spatial intervals, with the Audio recording medium compared to the image recording medium in time work offset, and
• - Sub information recording means, which a segment indexing Sub information in the sub-information recording area of the magnetic tape record, simultaneously with the recording operation of the image recording medium or the audio recording medium, as the case may be, by which is first recorded on the magnetic tape, the segmentin dicating sub-information contains an index, with the help of which behind each other on the magnetic tape locate the drawing position.

According to an advantageous embodiment of the invention, the still image contains information a predetermined amount of information and the audio information a variable amount of information, when the audio information first recorded at discrete spatial intervals, areas in the Main information recording area remain free, the size of each corresponds to the scope or the amount of still image information.

According to another advantageous embodiment of the invention, the Still picture information, a predetermined amount of information and the audio formation a variable amount of information, when the still picture formation is first recorded at discrete spatial intervals, Areas in the main information recording area remain free of which each a predetermined size for successively recording the Au owns dioinformation.

The invention also relates to a recording method in which Main information in a main information recording area Magnetic tape and sub-information in a sub-information record area of the magnetic tape are recorded, the sub-information at the reproduction of the main information provides an index and the main information mation consists of information units, each one still image information tion, paired with assigned audio information, included, marked through the following steps:

• - It will only be the still picture information for the respective information unit below in the main information recording area of the magnetic tape recorded discrete spatial intervals,
• - Simultaneously with the recording of the still picture information, the indication sub information in the sub information recording area on the Magnetic tape recorded, the indexing sub-information an In dex to locate the recording position at the subsequent opening drawing of the audio information provides, and
• - Using the indexing sub-information, the record location and audio information is recorded, and paired with the first recorded still image information.

According to a preferred embodiment of the invention, the stand  image information contain a predetermined amount of information while the Audio information contains a variable amount of information. Will the stand image information recorded, so remain in the main information record area reserved areas free, each of these reserved areas has a predetermined size sufficient to accommodate the subsequent Au to be able to record dio information there.

The invention further relates to a method for recording information where main information in a main information record area of a magnetic tape and subinformation in a subinformation Recording area of the magnetic tape can be recorded, the Sub provides an index when the main information is reproduced and the main information consists of information units, each one Still image information paired with associated audio information included, characterized by the following steps:

• - It is only the audio information for the respective information units in the Main information recording area of the magnetic tape under discre th spatial intervals recorded,
• - at the same time as the recording of the audio information, the indexing Sub information in the sub information recording area on the Ma gnetband recorded, the indexing sub-information an index to locate the recording position at the subsequent opening drawing of the still image information provides, and
• - The recording position is determined using the indexing subin formation is localized and the still image information is recorded tion to be paired with the first recorded audio information the.

In a preferred embodiment of the invention, the stand contains picture information a predetermined amount of information while the audioin formation contains a variable amount of information. When recording the Audio information is then predetermined or reserved areas in the Main information storage area of the magnetic tape released, each these areas have a size that is equal to the scope or quantity of the respective still picture information.  

The invention also relates to a method for playing a Ma gnetbands, on which there are several information units, each as main information, still image information and an associated with it dio information that are paired in this order. During the playback process, the output of the reconstructed still picture information tion delayed, so that the delayed still picture information simultaneously with the Audio information can be output with the still picture information is paired.

Last but not least, the invention relates to a playback device for Playing a magnetic tape on which several information units are stored chert, each as main information, still image information and egg ne assigned audio information that is paired with each other in this order are included with:

• - Image reproducing means for reproducing the still image information from the Ma gnet ribbon,
• - Audio reproducing means for reproducing the audio information from the magnet tape,
• - An image memory for storing the still image information by the Has been outputted, and
• - Playback control means, which after completion of the registration of the stand image information in the image memory the still image information read Read out from the image memory and the read out still image information at the same time as the Au reproduced by the audio reproducing means Output audio information.

The invention is described in more detail below with reference to the drawing described. Show it:

Fig. 1 is a schematic illustration of a recording format for recording on of information on a magnetic tape, in conformity with the prior art,

Fig. 2 is a block diagram of an information recording and -wiederga stunning device according to one embodiment of the invention,

Fig. 3 is a flowchart showing a sound recording sequence in a B-recording mode of the device according to Fig. 2,

Fig. 4 is a flow chart for explaining an image recording sequence in the B recording mode of the device of Fig. 2;

Fig. 5 shows a recording format when recording on a magnetic tape in accordance with the B recording mode;

Fig. 6 is a flowchart for explaining the reproducing operation in the apparatus of Fig. 2,

Fig. 7 is a flowchart for explaining an image recording sequence in a C-recording mode of the device according to Fig. 2,

Fig. 8 is a flow chart for explaining a sound recording sequence in the C recording mode of the device of Fig. 2, and

Fig. 9 shows a recording format for recording on a magnetic tape in accordance with the C recording mode.

Preferred embodiments are described below with reference to the drawing Example of the invention described in more detail.

Fig. 2 shows a schematic block diagram of the construction of an information recording and reproducing device according to the invention. In the present case, the information recording / playback device is a DAT recorder (digital audio tape recorder), which can work in a two-channel mode, among other things. This two-channel mode can be switched, as will be described, between a recording and reproducing mode for two types of audio signals on the one hand and a recording and reproducing mode for still picture video signals on the other hand.

An audio signal of one type is input via an input connection TR ben. In the present case, this audio signal is an audio signal that is emitted by a  Loudspeaker is reproduced, which po is sitioned. Another input terminal TL is used to input audio signals of a different kind. This audio signal is in the present case, for. B. a Sound signal reproduced from a loudspeaker related to the The listener is positioned in the front left.

Still picture video signals can be input via a further input connection TV. The input connections TR, TL and TV are each connected to the input side of an A / D converter 1, 2 and 6 (analog / digital converter).

The A / D converters 1 and 2 serve to convert the audio signals that have been input through the respective input terminals TR and TL into 16-bit digital audio signals D 1 and D 2 , and output these audio signals as serial signals . In the present exemplary embodiment, the A / D converters 1 and 2 each have a sampling frequency of 48 kHz.

The output connections of the A / D converters 1 and 2 are each connected via lines 3 and 4 to input connections 51 and 52 of a changeover switch 5 (selector switch).

The A / D converter 6 is used to convert any video signal that has been input via the assigned input terminal TV, e.g. B. to convert into a digital 8-bit video signal D 3 . From the A / D converter 6 , the converted video signal is then transmitted as a parallel signal to a data bus 7 . In the present embodiment, the A / D converter 6 has a sampling frequency of 14.3 MHz.

An image memory 8 a is also connected to the data bus 7 . The digital video signal D 3 for an image that has been output by the A / D converter 6 is transmitted via the data bus 7 to the image memory 8 a and stored in it.

Further, a parallel / serial converter 9 (P / S) converter is connected to the data bus 7 connected to the 8-bit digital video signals receives, via the data bus 7, which have been read out from the image memory 8a, the P / S Converter 9 converts these video signals, which are received in parallel form, into a serial signal and outputs them. The output terminal of the P / S converter 9 is connected to an input terminal 53 of the changeover switch 5 (selector switch).

The changeover switch 5 serves to selectively lei the digital signals received at the input connections 51 , 52 and 53 to the output connection 54 , in response to a selection signal which is transmitted from a control circuit 20 to the changeover switch 5 . The output terminal 54 of the changeover switch 5 is connected via a line 10 to a recording signal processing circuit 11 of the next stage.

In this embodiment, two recording modes are possible. One is used to record audio signals, while the other is used to record video signals. In the audio recording mode, a selection is made between the input terminals 51 and 52 to connect them to the output terminal 54 of the changeover switch 5 . With at whose words, recording mode, audio digital Au are in diosignal D 1 that comes from the A / D converter 1, and the digital audio signal D 2 that comes from the A / D converter 2, processing for the recording signal processing scarf 11 supplied, namely as signals to be recorded in corresponding two channels.

On the other hand, in the image recording mode, the output terminal 54 of the changeover switch 5 is connected to the input terminal 53 and held in this state. Thus, in the image recording mode, the digital video signal supplied from the A / D converter 6 is transmitted to the recording signal processing circuit 11 to be recorded in both of two channels.

The recording signal processing circuit 11 has, inter alia, a modulation function in order to modulate the incoming digital signals, and a sub-information supplementary function, with the aid of which error correction information or other sub-information can be added to the incoming digital signals. The signals processed by the recording signal processing circuit 11 are recorded on a magnetic tape 12 using a rotating magnetic head 21 or the like. The sub-information contains a segment-indexing sub-code b, which is recorded in a sub-code recording area on the magnetic tape 12 , simultaneously with the image recording or the audio signal recording, whichever is carried out first.

To the device according to the invention also includes a playback signal processing circuit 13 , which has a demodulation function to demodulate the signals read from the magnetic tape 12 with the aid of a rotating magnetic head 21 or the like. The processing circuit 13 also has an error correction function in order to be able to carry out an error correction using the subinformation read out. The output terminal of the reproduction signal processing circuit 13 is connected via a line 14 to an input terminal 154 of a changeover switch 15 (selector switch).

The changeover switch 15 has output terminals 151 , 152 and 153 and serves to selectively route the digital signals, which have been supplied from the playback signal processing circuit 13 via line 14 to the input terminal 154 , to one of the output terminals 151 , 152 , 153 , in response to a selection signal from the control circuit 20 , which is supplied to the selector switch 15 . The output terminals 151 and 152 are each connected to a D / A converter 16 and 17 (digital / analog converter).

The other output terminal 153 of the changeover switch 15 is connected to the input of a series / parallel converter 18 (S / P converter). The S / P converter 18 is used to convert the digital signal, which it has received from the output terminal 153 of the changeover switch 15 , into a parallel 8-bit signal which is output by it. The output terminal of the S / P converter 18 is connected to the data bus 7 , which receives said 8-bit parallel signal from the S / P converter 18 .

In addition to the image memory 8 a mentioned above, a further image memory 8 b is connected to the data bus 7 . These two image memories 8 a and 8 b are also controlled with respect to the write and read operation by the control circuit 20 , the image memories 8 a and 8 b have the task of storing digital signals that are output by the S / P converter 18 when there is a playback operation (playback operation).

A D / A converter 19 is also connected to the data bus 7 and converts the digital signals, which were read out from the image memories 8 a and 8 b during the playback operation, into analog signals. The output circuit of the D / A converter 19 is connected to an output terminal TV 1 .

The output connections 151 and 152 of the changeover switch 15 are each connected to the input of a D / A converter 16 and 17 , the outputs of which are connected to output connections TR 1 and TL 1 on the device side.

Fig. 3 shows a flow chart for explaining a sound recording sequence in a recording mode of the DAT recorder described above, which recording mode is hereinafter referred to as a B-recording mode. Fig. 4 is a flow chart for explaining an image recording sequence in the same recording mode. 5, a signal recording format for recording on a magnetic tape 12 in the same recording mode is shown schematically in FIG . FIG. 6 is a flowchart for explaining a playback mode of the DAT. Recording and reproducing modes of the DAT will be described below with reference to Figs. 3 to 6, in which the B-recording mode is used. Audio signals are recorded first.

recording

In the recording operation, the audio signal is first recorded on the magnetic tape 12 in accordance with the flow chart shown in FIG. 3. After the start of the recording operation in step s 1 , in the next step s 2 , an audio signal is input via the input connection TR and the input connection TL, of which the first is reproduced with the aid of a loudspeaker which is located at the front right of a listener while the second is reproduced with the help of a loudspeaker located at the front left of the listener. At this time, no still video signals were input.

In step s 3 , the audio signals input via the input connections TR and TL are each led to A / D converters 1 and 2 , in which they are sampled with a sampling frequency of 48 kHz and, for example, in digital 16-bit audio signals D 1 and D 2 are converted, which are then given to lines 3 and 4 . The digital audio signals D 1 and D 2 are conducted via the lines 3 and 4 to the respective input connections 51 and 52 of the changeover switch 5 .

The digital audio signals conducted to the input terminals 51 and 52 are then selectively transmitted to the output terminal 54 of the changeover switch 5 , in order then to be supplied to the recording signal processing circuit 11 via the line 10 . More specifically, the changeover operation of the changeover switch 5 takes place synchronously with the sampling frequency of the A / D converter 1 and 2 .

The amount of data Da per second of digital audio signals D 1 and D 2 as a result of the analog / digital conversion via the A / D converters 1 and 2 can be expressed as follows:
Da = 48 (kHz) × 16 (bit) × 2 (ch) = 1536 (kBit / s).

In the next step 54 , the digital audio signals received from the recording signal processing circuit 11 are processed in the recording signal processing circuit 11 . The digital signals are modulated here, supplemented with error correction information or other sub-information, etc.

The digital audio signals processed in this way are then recorded in the next step s 5 sequentially in two corresponding channels on the magnetic tape 12 .

At the same time, in step s 6, the aforementioned segment indexing subcode b, which is a form of the sub information, is recorded in the sub code recording area of the magnetic tape 12 , as shown in FIG. 5 (a). More specifically, the segment indexing subcode b is in agreement with the still image video signal recording area in each of the segments R 1 , R 2 . . . in which the still picture video signal for one picture and the associated audio signal are recorded as a pair.

The Fig. 5 (c) shows the format of one track 30 on the magnetic tape 12. The rotating head 21 scans the magnetic tape 12 in the head scanning direction, which is indicated by the arrow 29 , to generate the track 30 . The track 30 contains a main information recording area 31 , ATF areas 32 a and 32 b, subcode recording areas 33 a and 33 b and border areas 34 a and 34 b (edge areas). The main information recording area 31 is the area in which the still picture video signal or the audio signal is recorded. The ATF areas 32 a and 32 b store ATF signals (Auto matic Track Following Signals). The sub-code recording areas 33 a and 33 b are those areas in which several types are chert vomit of subcodes, b including the segmentindizierenden subcode. The Grenzbe rich 34 a and 34 b (edge areas) are provided as areas in which a stable contact between the rotating magnetic head 21 and the magnetic tape 12 is obtained.

In the present exemplary embodiment, the first half region V 1 of a segment R 1 is z. B. a recording area for a still image video signal v 1 , while the second half areas A 1 of the segment R 1 is a recorded area for an audio signal a 1 . Since each still picture video signal represents a picture with a constant amount of data, the recording area V 1 for the still picture video signal v 1 has a fixed predetermined size. In the recording operation described above, only the audio signals are recorded, the recording area V 1 for the still image video signal v 1 being left blank.

In the next step s 7 , it is checked whether the recording operation is to be ended or not. If the recording operation is to be continued, step s 2 is subsequently reached in order to repeat the processes described above.

If, on the other hand, it is determined in step s 7 that the recording operation is to be ended, then step s 8 is subsequently reached, in which the audio recording operation is stopped.

The audio signals a 1 , a 2 ,. . . the z. B. serve as an explanation for the respective Standbil, are in the audio signal recording areas A 1 , A 2 , .. of the segments R 1 , R 2,. . . recorded in discrete spatial intervals as shown in Fig. 5 (a). There is no limit to the amount of data for each audio signal, so that the size of each audio signal recording area A 1 , A 2 , .. can be selected or determined in accordance with the amount of data.

After the audio signal recording is finished, the still image video signals are recorded on the magnetic tape 12 in accordance with the flowchart of Fig. 4. More specifically, after the recording operation is started in step n 1, a search operation is performed in step n 2 , to locate the recording position on the magnetic tape 12 at which the desired still image video signal is to be recorded.

This search operation is started automatically by replaying the recorded audio signals, that is, the explanation, in accordance with the playback operation described below and by manually setting a search start switch, not shown, to ON at a time when the explanation on that part appears on which the still image is to be recorded. In the search mode, the starting position of the target segment, for example the segment R 1 , is localized using the segment-indexing subcode b as an index which has been recorded in the subcode recording area at the same time as the audio signals.

In the next step n 3 , still image video signals to be recorded, each representing an image, are sequentially input through the input terminal TV.

Then in step n 4 each input video signal is sampled with the aid of the A / D converter 6 at a sampling frequency of 14.3 MHz in order to be converted into a digital 8-bit video signal D 3 , which is then used as a parallel signal to Data bus 7 is transmitted.

The digital video signal D 3 , which has been transmitted via the data bus 7 , is then written into the image memory 8 a, in step n 5 .

The amount of data Dv of the digital video signal D 3 , which represents a still image and is stored in the image memory 8 a, corresponds to the output of the A / D converter 6 generated in a field period, the field period being the first time period and 1/60 s is. The resulting amount of data Dv is:
Dv = 14.3 (MHz) × 8 (bit) × 1/60 (s) = 1.91 (megabit)

If the writing process of the digital video signal D 3 for an image in the image memory 8 a has ended, the stored digital video signal is read out of the image memory 8 a in step n 6 . This reading process takes place over a second time period which is sufficiently longer than the first time period. In step n 7 , the read-out digital video signal is transmitted via the data bus 7 to the P / S converter 9 , which converts the video signal from a parallel signal into a serial signal and supplies this serial signal to the input terminal 53 of the changeover switch 5 .

From the two aforementioned equations 1 and 2, the time Tv required to transmit the digital video signal for one picture to the recording signal processing circuit 11 is thus:
Tv = 1.91 (megabits) / 1536 (kbit / s) = 1.24 (s)

As already mentioned, in the conventional DAT recorder described above, the video signals and the audio signals are recorded in four corresponding channels simultaneously on the magnetic tape. The audio signal sampling frequency there is 32 kHz, while the number of bits which are converted to analog / digital per sample is 12. This results in the amount of data D to be transmitted per second for an image, which is represented by the video signal recorded in two channels and can be read from the image memory, with the same number of channels for recording the audio signals:
D = 32 (kHz) × 12 (bit) × 2 (ch) = 768 (bit / s)

Based on equations 2 and 4, the time T required for reading out the digital video signal for an image from the image memory is then:
T = 1.91 (MHz) / 768 (bit / s) = 2.49 (s)

A comparison of the above data shows that a much shorter time is required in the device according to the invention to record the video signal on the magnetic tape 12 than in the conventional DAT recorder.

In the next step n 8, the digital video signal which has been supplied to the recording signal processing circuit 11, processed by these Aufzeich voltage signal processing circuit. 11 The digital video signal can be modulated here, or error correction information or other sub-information can be added to the digital video signal.

In the next step n 9 , each digital video signal that has been processed in the recording signal processing circuit 11 is sequentially recorded in two channels on the magnetic tape 12 .

In this way, the digital video signal v 1 of an image, to which the explanation belongs, which has been recorded with the aid of the first audio signal a 1 , is stored in the first and as yet undefined half V 1 of the segment R 1 , as shown in FIG. 5 (b) reveals. The still image video signal v 1 and the audio signal a 1 , which represents the associated explanation, are therefore stored as a pair one behind the other in the longitudinal direction in two separate recording areas of the segment R 1 .

In the next step n 10 , it is checked whether the recording operation is to be ended or not. If it is to be continued, step n 2 is subsequently reached again, so that the processes described above run repeatedly.

On the other hand, if it is determined in step n 10 that the recording operation is to be ended, step n 11 is subsequently reached, in which the image recording operation is stopped.

Playback

How the information is reproduced from the magnetic tape 12 is described in more detail below with reference to FIG. 6.

After the start of the playback operation in step m 1 , the recorded signal is read from the magnetic tape 12 , with the aid of a rotating magnetic head or the like, not shown, which is done in step m 2 . The signal thus read out is then transmitted to the playback signal processing circuit 13 .

In the next step m 3 , the read-out signal is processed in the reproduction signal processing circuit 13 , for example demodulated. An error correction can also take place there, specifically on the basis of the reproduced sub-information. The digital signal processed in this way is then transmitted via line 14 to input terminal 154 of changeover switch 15 .

The changeover switch 15 has, as already mentioned, output connections 151 , 152 and 153 , the digital signal which corresponds to the video signal and which has been obtained via the input connection TV being transmitted via the input connection 154 of the changeover switch 15 to the output connection 153 . In other words, this digital signal is fed to the series / parallel converter 18 in step m 4 , which converts it into a parallel 8-bit signal and then transmits it to the data bus 7 . In step m 5 , this digital signal is written into one or the other of the two image memories 8 a, 8 b, which are connected to the data bus 7 .

In the subsequent step m 6 , the one of the image memories 8 a, 8 b is read out, in which the digital video signal for an image has been written, the digital video signal read out of the image memory being supplied to the data bus 7 , via which it is then sent to the D / A converter 19 is supplied. In step m 7 , the digital video signal is converted by the D / A converter 19 into an analog signal, which is then transmitted to the output connection TV 1 .

On the other hand, the digital signals corresponding to the audio signals obtained through the input terminals TR and TL are supplied to the output terminals 151 and 152 of the changeover switch 15 . These digital signals thus obtained are supplied to the respective D / A converters 16 and 17 , namely in step m 8 , in order to convert the digital signals into analog signals which appear at the output connections TR 1 and TL 1 .

Each digital video signal is written in one or the other of the image memories 8 a, 8 b, such that when one of the image memories is written, the digital video signal stored in the other of the image memories is read out and transmitted to the D / A converter 19 .

If the respective digital signal has been written into one of the two image memories, ie if the writing of the digital video signal for an image has ended, this image memory is enabled to output its content to the D / A converter 19 .

At the same time, a write operation is started in order to be able to store the next digital video signal from the S / P converter 18 in the other image memory. In other words, the outputs of the image memories 8 a and 8 b are alternately transmitted to the D / A converter 19 , so that a still image can be generated on a display device, for example on a cathode ray tube (CRT), which changes at fixed time intervals . Simultaneously with the reproduction or reproduction of the video signals, the audio signals are reproduced sequentially, which, for. B. serve as an explanation for the corresponding still image.

In the next m 9 it is checked whether the playback operation must be ended or not. If it is to be continued, step m 2 is subsequently reached, so that the processes described above are repeated. If, on the other hand, it is determined in step m 9 that the playback mode is to be ended, step m 10 is subsequently reached, which leads to the completion of the playback mode.

The above description was of a B-recording mode recording and reproducing mode in which the audio signals are recorded before the image signals. However, it is also possible to record the image signals before the audio signals, this operating mode being referred to as the C recording mode. The C recording mode is performed in accordance with the flowcharts in Figs. 7 and 8. Fig. 7 shows the image recording operation, while Fig. 8 illustrates the audio recording operation. In contrast, in Fig. 9, a signal recording format is shown on the magnetic tape, namely for the C-recording mode. Referring to FIGS. 7 through 9, the operation of a DAT with C-recording mode will be described in more detail below.

In this recording mode, the video signals are first recorded sequentially on the magnetic tape 12 in accordance with the flow chart of Fig. 7. More specifically, after the recording mode is started in step c 1, a still image video signal for a picture to be recorded is input to the input terminal TV supplied, in step c 2 . No audio signals are being input at this time.

Then, the input video signal is sampled using the A / D converter 6 , as in the image recording with the B recording mode, in step c 3 to convert the video signal into a digital 8-bit To convert video signal D 3 . This converted video signal D 3 is then transmitted as a parallel signal to the data bus 7 and passed in step c 4 via the data bus 7 to the image memory 8 a and stored in the sem.

The digital video signal corresponding to an image, which has been written into the image memory 8 a, is read from this image memory 8 a in step c 5 , specifically over the second time period, which is sufficiently longer than the first time period. In step c 6 , the read video signal is transmitted to the P / S converter 9 and converted into a serial signal in this, which is supplied to the input terminal 53 of the changeover switch 5 .

After the recording signal processing circuit 11 receives this digital video signal, it is processed therein. It modulates the digital signal, adds error correction information and / or other sub-information, and the like.

Each digital video signal processed in this way is then recorded in step c 8 sequentially in the two channels on the magnetic tape 12 .

At the same time, the aforementioned segment-indicating subcode b, that is to say a form of subinformation, is then recorded in step c 9 in the subcode recording area of the magnetic tape 12 , as shown in FIG. 9 (a). More specifically, the segment indexing subcode b is made in accordance with the still picture video signal recording area V 1 , 2 ,. . . in each of the segments R 1 , R 2,. . . recorded in which the still image video signal for one image and the associated audio signal are stored as a pair. In this recording operation, only the video signals are recorded, while the audio signal recording areas A 1 , A 2 ,. . . in the segments R 1 , R 2,. . . remain blank, in prescribed reserved areas.

In the next step c 10 , it is determined whether the recording operation should be ended or not. If the recording operation is to be continued, step c 2 is subsequently reached again, which leads to the repetition of the processes described above.

On the other hand, if it is determined in step c 10 that the recording operation is to be ended, step c 11 is subsequently reached, in which the image recording operation is stopped.

In this way, the video signals v 1 , v 2 ,. . ., each of which presents an image re, recorded at discrete spatial distances in the respective video signal recording areas V 1 , V 2,. . . of the segments R 1 , R 2,. . ., as shown in Fig. 9 (a).

After the video signal recording is finished, the audio signals are recorded on the magnetic tape 12 in accordance with the flowchart of Fig. 8. More specifically, after the recording operation in step d 1 is started, a search operation in step d 2 is performed to find the recording position to locate the magnetic tape 12 on which a desired audio signal is to be recorded.

This search mode is started automatically when the recorded video signals, that is, the still images, are reproduced in accordance with the playback mode and by manually actuating a search start key (not shown) which is switched on at a time at which the still image is reproduced or reproduced that belongs to the audio signal to be recorded. In the search mode, the starting position of the audio recording area A 1 is located or found in the segment R 1 using the segment-indicating subcode b as an index which has been recorded in the subcode recording area simultaneously with the recording of the video signals.

In the next step d 3 , an audio signal is input via the input connection TR, which is to be reproduced by means of a loudspeaker which is located at the front right in relation to a listener. At the same time, an audio signal is input via the input connection TL, which is to be reproduced by means of a loudspeaker which is located at the front left with respect to the listener.

Then, the respective audio signals that have been input via the input terminals TR and TL, as in the audio recording with the B recording mode, are transmitted to the A / D converters 1 and 2 to convert them into digital audio signals D 1 and D 2 to be converted, which are then transmitted to lines 3 and 4, respectively. This A / D conversion takes place in step d 4 . The digital audio signals D 1 and D 2 transmitted to lines 3 and 4 are then supplied to the respective input connections 51 and 52 of the changeover switch 5 .

The digital audio signals, which gelan to the input terminals 51 and 52 gene, are finally leads to the output terminal 54 of the changeover switch 5 ge and reach via the line 10, the recording signal processing circuit 11th

In the next step d 5 , the digital audio signals are processed in the recording signal processing circuit 11 , which modulates the digital signals, adds error correction information or other sub-information, and the like. The digital audio signals processed in this way are then recorded in the subsequent step d 6 sequentially in two corresponding channels on the magnetic tape 12 .

In this way, z. B. record the audio signal a 1 as an explanation for the assigned first recorded image, which is presented by the still image video signal v 1 re, in the first half of the blank area A 1 of the segment R 1 . In other words, the still image video signal v 1 and the audio signal a 1 , which represents the associated explanation, are recorded in pairs and in succession in the longitudinal direction of the magnetic tape, in two separate recording areas of the segment R 1 .

In the next step d 7 it is checked whether the recording operation is to be ended or not. If the recording operation is to be continued, a return is made to step d 2 , which leads to the repetition of the processes described above. On the other hand, if it is determined in step d 7 that the recording operation is to be ended, step d 8 is subsequently reached, in which the audio recording operation is stopped.

In other words, the audio signals a 1 , a 2 ,. . . the z. B. Explanations for the respective still images are in the audio signal recording areas Chen A 1 , A 2 ,. . . of the segments R 1 ,. . . recorded, namely under discreet spatial intervals, as shown in Fig. 9 (b). In the C recording mode, the audio recording areas A 1 , A 2 ,. . . in the respective segments R 1 ,. . . a fixed size during image recording. When recording audio signals, it is therefore necessary to adjust the data quantity of each audio signal to the respective size of the recording areas A 1 , A 2 ,. . . to coordinate or restrict.

The arrangement of the signals recorded in the C recording mode is the same as the arrangement of the signals used in the B recording operation Art have been recorded so that the signals in the C record Play mode of operation in the same manner as in the previous be written playback mode.

As described above, the recording operation of the fiction DATs the video signals and the associated audio signals in pairs  and alternately in the longitudinal direction of the strip in the respective segment on the Ma gnetband recorded so that it is possible to select any part of the Record or overwrite audio signals or video signals.

In a recording and reproducing device according to the invention, still picture information and audio information can be recorded as a pair of information, with selective post-recording of one or the other of the information belonging to the information pair being possible. With the help of an image recording device 5 , 6 , 7 , 8 a, 8 b, 9 , 11 , 21 , a series of still image information v 1 , v 2,. . . corresponding to a number of images recorded on a magnetic tape 12 at discrete spatial intervals. At the same time, a segment-indicating sub-information b is recorded on a sub-information recording area of the magnetic tape 12 by means of a sub-information recording device 11 , 21 . Subsequently, with the help of an audio recording device 1 , 2 , 5 , 11 , 21 , the timing of which differs from that of the image recording device, a series of audio information a 1 , a 2 ,. . ., which is associated with the respective still image information, is recorded at discrete spatial intervals on the magnetic tape, using the segment-indicating sub-information b recorded first as an index. The still image information v 1 , v 2,. . . and the associated audio information a 1 , a 2 ,. . . can thus be in the longitudinal direction in two consecutive and separate areas V 1 , A 1 ,. . . of a respective segment R 1 , R 2 ,. . . to save. The image recording device and the audio recording device can also be operated in reverse order.

Claims (10)

1. Recording device for the successive recording of information on a main information recording area of a magnetic tape ( 12 ), the information including still picture information, paired with assigned audio information, for the purpose of forming a recording segment (R 1 , R 2 ,...), With:

• - Image recording means ( 5 , 6 , 7 , 8 a, 8 b, 9 , 11 , 21 ) that only record the still picture information, segment by segment or in the respective segments on the magnetic tape ( 12 ) under discrete spatial intervals len,
• - Audio recording means ( 1 , 2 , 5 , 11 , 21 ) which only record the audio information, namely segment by segment or in the respective segments on the magnetic tape ( 12 ) at discrete spatial intervals, which, however, are compared to the image recording means ( 5 , 6 , 7 , 8 a, 8 b, 9 , 11 , 21 ) work at different times, and
• - Sub-information recording means ( 11 , 21 ) which record segment-indicating sub-information (b) on a sub-information recording area of the magnetic tape ( 12 ), simultaneously with the recording operation of the image recording means ( 5 , 6 , 7 , 8 a, 8 b, 9 , 11 , 21 ) or the audio recording means ( 1 , 2 , 5 , 11 , 21 ), whichever is the first to record on the magnetic tape ( 12 ), the segment-indicating sub-information (b) containing an index with whose help locate the recording position successively on the magnetic tape ( 12 ) recording means.

2. A recording device for recording information in which main information is recorded in a main information recording area of a magnetic tape ( 12 ) and sub information is recorded in a sub information recording area of the magnetic tape ( 12 ), the sub-information providing an index when the main information is reproduced and contain the main information from still picture information, paired with assigned audio information, with:

• - Image recording means ( 5 , 7 , 8 a, 8 b, 9 , 11 , 21 ), which record only the still image information for the respective information units in the main information recording area of the magnetic tape ( 12 ) under discrete spatial intervals,
• - Audio recording means ( 1 , 2 , 5 , 11 , 21 ) which record only the audio information for the respective information units in the main information recording area of the magnetic tape ( 12 ) at discrete spatial intervals, the audio recording means working at different times from the image recording means, and
• - Sub-information recording means ( 11 , 21 ) which record segment-indicating sub-information (b) in the sub-information recording area of the magnetic tape ( 12 ), simultaneously with the recording operation of the image recording means ( 5 , 6 , 7 , 8 a, 8 b , 9 , 11 , 21 ) or the audio recording means ( 1 , 2 , 5 , 11 , 21 ), whichever is the first to record on the magnetic tape ( 12 ), the segment-indicating sub-information (b) containing an index with its Help locate the recording position one after the other on the magnetic tape ( 12 ) recording means.

3. Recording device according to claim 1 or 2, characterized records that the still picture information has a predetermined amount of information ge and the audio information contain a variable amount of information, and that if the audio information is first under discrete spatial inter vallen is recorded, areas in the main information recording area rich free, the size of which corresponds to the scope of the still image information corresponds. 4. Recording device according to claim 1 or 2, characterized records that the still picture information has a predetermined amount of information ge and the audio information contain a variable amount of information, and that when the still image information is first under discrete spatial Intervals are recorded, areas in the main information record range, each of which is a predetermined size apart subsequent recording of the audio information. 5. An information recording method in which main information in egg nem main information recording area of a magnetic tape (12) and sub-information are recorded in a sub-information recording region of the magnetic tape (12), wherein the sub-information provides an index when playing back the main information and the main information consists of information units, each containing still picture information, paired with assigned audio information, characterized by the following steps:

• only the still picture information for the respective information units is recorded in the main information recording area of the magnetic tape ( 12 ) under discrete spatial intervals,
• - Simultaneously with the still picture information, the indexing sub-information is recorded in the sub-information recording area on the magnetic tape ( 12 ), the indexing sub-information providing an index for locating the recording position for the subsequent recording of the audio information, and
• - With the aid of the indexing sub-information, the recording position is located and the audio information is recorded in order to pair it with the first recorded still image information.

6. Recording method according to claim 5, characterized in that the still picture information is a predetermined amount of information and the Audio information contain a variable amount of information and that then when the still picture information is recorded, areas in the main information tion recording area, each of which has a predetermined one Size for consecutive recording of the audio information. 7. An information recording method in which main information in egg nem main information recording area of a magnetic tape (12) and sub-information are recorded in a sub-information recording region of the magnetic tape (12), wherein the sub-information provides an index when playing back the main information and the main information consists of information units, each containing still image information, paired with assigned audio information, characterized by the following steps:

• only the audio information for the respective information units is recorded in the main information recording area of the magnetic tape ( 12 ) under discrete spatial intervals,
• - Simultaneously with the recording of the audio information, the indexing sub-information is recorded in the sub-information recording area on the magnetic tape ( 12 ), the indexing sub-information providing an index for locating the recording position for the subsequent recording of the still image information, and
• - Using the indexing sub-information, the recording position is located and the still picture information is recorded to be paired with the first recorded audio information.

8. Recording method according to claim 7, characterized in that that the still picture information is a predetermined amount of information and the Audio information contain a variable amount of information, and that at Recording of audio information areas in the main information record remain free, each of which has a size that corresponds to the circumference or the amount of still image information. 9. Method for playing a magnetic tape on which several informa tion units are stored, in each of which there is main information det, which from a still picture information and an associated audio information tion, which are paired with each other in this order, thereby ge indicates that the output of the reconstructed still picture information is so it is delayed that the delayed still picture information coincides with the Au audio information is output, which is paired with the still image information. 10. Play device for playing a magnetic tape ( 12 ) on which a plurality of information units are recorded, each containing main information, which consists of still picture information and associated audio information which are paired with one another in this order, characterized by:

• - Image reproduction means ( 7 , 13 , 15 , 18 , 19 , 21 ) for reproducing the still picture information from the magnetic tape ( 12 ),
• - Audio reproducing means ( 13 , 15 , 16 , 17 , 21 ) for reproducing the audio information from the magnetic tape ( 12 ),
• - An image memory ( 8 a, 8 b) for storing the still image information, which was provided by the image reproducing means ( 7 , 13 , 15 , 18 , 19 , 21 ), and
• - reproduction control means (20) after completion of writing of still image information in the image memory (8 a, 8 b), the still image information from the image memory (8 a, 8 b) to read out and the read-out Standbildinfor mation simultaneously with by the audio reproducing means (13, 15 , 16 , 17 , 21 ) output reproduced audio information.