KR20010105665A - Recording/ reproducing signal processing method and apparatus for digital vcr - Google Patents

Abstract

According to the present invention, a digital broadcast signal can be recorded or reproduced on a magnetic tape of VHS, S-VHS, or D-VHS by changing the digital data recording format according to the recording density of the magnetic tape in the analog VD. .

The object of the present invention is a first step of determining the type of tape based on the recording density when the data recording mode is set; When the input data is stored in the DRAM, the number of sync blocks of the main data per track may be set as a reference value or the number of sync blocks may be set to an appropriate value below the reference value and stored as the number of tracks in the shuffling unit according to the determination result. A second step; A third step of performing external IC encoding and internal IC encoding on the main data stored in the DRAM and recording the same on the recording medium is achieved.

Description

RECORDING / REPRODUCING SIGNAL PROCESSING METHOD AND APPARATUS FOR DIGITAL VCR}

The present invention relates to a technology for processing a recording / playback signal in an analog digital digital TV, and in particular, all of the VHS, S-VHS, and D-VHS formats according to the recording density of the magnetic tape as a recording medium. The present invention relates to a method and apparatus for processing a recording / reproducing signal of a digital VRL for recording or reproducing a digital broadcast signal on a magnetic tape.

FIG. 1 is a block diagram of an analog combined digital VLC according to the prior art. As shown therein, a channel and a program required in a digital signal DS transmitted from the outside are selected and recorded on a recording medium or a television receiver 120 is shown. A digital broadcast receiver (110) which is adapted to be displayed on the screen; A digital signal processor (130) for receiving a digital signal from the digital broadcast receiver (110) and processing the digital signal into a form suitable for recording on a recording medium; An analog signal processor (150) which receives an analog signal (AS) from the digital signal processor (130) through a channel selector (140) and processes it in a form suitable for recording on a recording medium; Switches and amplifiers 161 and 163 for switching and amplifying the data output from the digital signal processor 130 or the audio signal output from the analog signal processor 150 to be suitable for recording on a magnetic tape 168 which is a recording medium. 162A, 162B); Switches and amplifiers (164,166) and (165A, 165B) for switching and amplifying the analog video signal output from the analog signal processor (150) to be suitable for recording on the magnetic tape (168); Each head pair 169A, 169B, 169C, 169D, which records the signals output through the switches 163, 166 on the magnetic tape 168 or reproduces the signals already recorded. 169E, 169F), the operation of which is described as follows.

The channel selector 111 of the digital broadcasting receiver 110 tunes a channel required by the digital signal DS received through a broadcasting station or a transmission cable, and the signal demodulator 112 uses the original channel signal from the tuned channel. Demodulate the digital signal The demodulated signal is output in the form of multiplexing of a plurality of programs. The program selector 113 selects one program according to a user's request and outputs it to the television receiver 120 on the one hand and the other side. Output to the digital signal processor 130.

The format converter 131 of the digital signal processor 130 converts the format of the digital signal input from the program selector 113 into a given standard, and the converted signal in the recording mode is converted to the waveform equalizer / data recovery 132. ) Is bypassed as is.

After the digital signal output from the digital signal processor 130 or the audio signal output from the analog signal processor 150 to be described later passes through the switches, the amplifiers 161, 163, and 162A, the first head pair 169A and 169B may be connected. Through the recording, the magnetic tape 168 is written in a predetermined format.

Meanwhile, the channel selector 140 selects a signal of a channel required by the analog signal AS, and the signal separator / combiner 151 separates the hi-fi audio signal and the video signal from the analog signal of the selected channel. . The voice signal processor 152 processes various noises in the voice signal, and the processed voice signal is recorded on the magnetic tape 168 through the above path.

In addition, the image signal separated by the signal separation / combining unit 151 is separated into a luminance signal and a color signal by the luminance signal processor 153 and the color signal processor 154, and the image signal separation / combining unit 155 And then through the switches and amplifiers 164, 166, 165A and then through the third head pair 169E, 169F to the magnetic tape 168 in a predetermined format.

Meanwhile, in a recent broadcast environment, digital broadcast signals are provided using satellites in addition to the existing analog broadcast signals. The transmission of digital broadcasting signals through satellites may include Mugunghwa satellite broadcasting in Korea, and the digital broadcasting via terrestrial broadcasting includes DTV broadcasting in the United States. In response to this emerging digital broadcasting era, a digital video cassette recorder (DVCR), which is a device for recording or reproducing digital broadcast signals, has been on the rise. An example of this is a D-VHS type V-Cell which is commercially available in the United States.

The DTV signal is transmitted as a MPEG2 (MPEG2: Moving Picture Experts Group 2) signal having a data rate of up to 19.4 Mbps including a video signal and an audio signal so that it can be received at home. In addition, terrestrial digital broadcasting currently under test in Korea is based on the standard of the DTV signal, which also has a maximum data rate of 19.4 Mbs including audio and video signals.

Magnetic recording devices for recording data in the form of digital bit streams on a magnetic tape using a rotating head include D-VHS digital VCR devices which are commercially available in the United States, Japan, and the like. Known. In these devices, when recording data on a high-performance iron oxide magnetic tape (D-VHS or S-VHS cassette tape), as long as it rotates at 1800 rpm after adding subcode data, error correction data, etc. to 14.1 Mbps digital data Record at 19.14 Mbps using two channels or two heads, or record at 38.28 Mbps using four heads of two channels rotating at 1800 rpm, with a data rate of 28.2 Mbps It exceeds the data rate of 19.4 Mbps, which is the standard of US DTV broadcasting.

The digital signal processing unit 130 processes data in units of data blocks (or sink blocks) when processing recording data or reproduction data. That is, the input digital signal is divided into a symbol consisting of a predetermined number, and a single data is added by adding a sync signal, an ID signal, a parity, and the like to the digital data divided into the predetermined number of symbols. Construct a block. Here, the symbol usually means one byte composed of 8 bits. After all, a data block means a sink block, which is used as a basic unit for signal processing when recording digital data.

In the home analog VRC, which records analog video signals using conventional iron oxide tape (VHS cassette tape), signals are recorded using one channel or two heads. The shortest recording wavelength commercially recordable on ordinary iron oxide tape while maintaining at rpm is about 0.83 μm. In addition, V-seal of the S-VHS ET standard recently distributed stipulates that the shortest recording wavelength recorded on a general iron oxide tape is about 0.83 m.

Treating 0.415 μm, which is half of the shortest recording wavelength, as the length of bits, which is the smallest unit of digital recording, is a common technique for digital recording, in which case it is possible to record commercially on common iron oxide tapes in consideration of compatibility or reliability between devices. The recording rate is about 14 Mbps. In other words, when the rotating head of the home VR rotates at 1800 rpm, the head travels in about 1 second at about 5.8 meters, and thus the distance of 5.8 meters can be allocated about 14 Mbits of 0.415 μm bit units. For example, 14 Mbit data can be recorded in one second.

Therefore, when the recording format applied to the D-VHS VRC is applied to a general iron oxide tape (VHS cassette tape) for recording analog video signals, data cannot be recorded normally. In other words, when a data rate of 19.4 Mbps including a video and audio signal of a DTV is applied to a general iron oxide tape in the track format of the D-VHS digital V-C, data cannot be recorded normally.

Because if you record the DTV signal to magnetic tape using two heads and four heads while maintaining the rotational speed of the rotating head drum at 1800 rpm, the recording rate will be increased from 19.4 Mbps to 38.28 Mbps using the D-VHS technology. This 38.28 Mbps value exceeds the recording rate of 28 Mbps that can be written on a regular iron oxide tape while using two channels and four heads and maintaining the drum speed at 1800 rpm. As a result, the digital VRC standard does not allow a digital signal to be recorded on a general iron oxide tape.

As described above, in the analog combined digital VLC according to the prior art, the digital TV broadcast signal cannot be recorded on the general V Oxide standard on a general iron oxide tape, which makes it difficult to use resources efficiently. Moreover, considering the number of VHS cassette tapes that are already widespread, it is a matter of first consideration.

Accordingly, it is an object of the present invention to adjust digital data recording formats for high-performance iron oxide tapes and general iron oxide tapes to record or reproduce digital broadcast signals on all cassette tapes of VHS, S-VHS, and D-VHS. The present invention provides a recording and playback signal processing method and apparatus.

1 is a block diagram of an analog combined digital VR according to the prior art.

2 is a block diagram of a digital signal recording signal processing apparatus according to the present invention;

Figure 3 is a block diagram of an embodiment of a digital signal recording signal processing apparatus according to the present invention.

Figure 4 is a block diagram of an embodiment of a digital signal playback signal processing apparatus according to the present invention.

Fig. 5A is a recording data format diagram for a high density magnetic tape.

Fig. 5B is a recording data format diagram for a low density magnetic tape.

6 is a track / sink block format diagram of data stored in a memory bank of a DRAM.

7 is a signal flowchart of a method of processing a recording signal of a digital VR according to the present invention;

8 is a signal flowchart of a digital signal playback signal processing method according to the present invention;

*** Description of the symbols for the main parts of the drawings ***

201,207: buffer memory 202,208: header addition unit

203: DRAM 203A-203C: memory bank

204: external IC processing unit 205,209 internal EC processing unit

206: control unit 210: additional circuit

211: selection circuit 212: signal recording unit

213: magnetic tape 214: media determination unit

According to the present invention, there is provided a method of processing a recording signal of a VR, comprising: a first step of determining a type of tape based on a recording density when a data recording mode is set; When the input data is stored in the DRAM, the number of sync blocks of the main data per track may be set as a reference value or the number of sync blocks may be set to an appropriate value below the reference value and stored as the number of tracks in the shuffling unit according to the determination result. A second step; And a third step of performing external IC encoding and internal IC encoding on the main data stored in the DRAM to record on the recording medium.

FIG. 2 is a block diagram illustrating an example of a VRC recording / reproducing signal processing apparatus according to an exemplary embodiment of the present invention. As shown in FIG. 2, a header for adding a header to main data MAIN DATA input through a buffer memory 201 is shown. A header adding unit 202; The main data input through the header adding unit 202 is stored as the number of tracks (1 bank) in the shuffling unit, and the number of sync blocks of the main data per track is set differently according to the type of the magnetic tape 213. DRAM 203 for; An external IC processing unit 204 and an internal IC processing unit 205 for performing external IC encoding and internal IC encoding on the data stored in the DRAM unit 203 in units of one bank; A control unit for controlling the operations of each V-Call unit and controlling the number of sync blocks of the main data per track in the DRAM 203 according to the type of the magnetic tape 213 determined by the media determination unit 214. 206; A header adding unit 208 for adding a header to the sub data input through the buffer memory 207 and an internal BC processing unit 209 for performing internal IC encoding; An additional circuit 210 and a selection circuit 211 for combining the internal BC processed main data and sub data and adding various additional signals; A signal recording circuit (212) for processing the output signals of the additional circuit (210) and the selection circuit (211) to be suitable for recording on a magnetic tape (213); The magnetic tape 213 is constituted by a medium discrimination unit 214 for detecting whether the magnetic tape 213 is a high performance iron oxide magnetic tape or a conventional iron oxide tape, which will be described in detail with reference to FIGS. Is as follows.

When the magnetic tape 213 which is a recording medium is inserted into the V-Cal and the recording mode is set, the control unit 206 transmits the high-performance iron oxide magnetic tape (D-VHS or the like) through the medium discriminating unit 214. Check if it is S-VHS cassette tape or normal iron oxide tape (VHS cassette tape). As an example of discrimination of the medium discrimination unit 214, discrimination may be made based on a discrimination hole formed in a cassette.

When the main data MAIN DATA having a predetermined capacity is sequentially stored in the buffer memory 201 in the recording mode, the header 203 is added to the main data by the header adding unit 202 by the controller 206. ), And the number of sync blocks of the main data stored in the DRAM 203 is determined differently according to the type of the magnetic tape 213. For example, if it is found to be a high-performance iron oxide magnetic tape, as shown in FIG. 5A, 306 sink blocks per track are stored by the number of tracks (for example, six) constituting the shuffling unit, If it is found that as shown in Fig. 5b, 216 sync blocks per track are stored for the number of tracks constituting the shuffling unit.

When all data of six tracks (one bank) is stored in the DRAM 203 as shown in FIG. 6, the external IC encoding is performed by the external IC processing unit 204 to add external parity. (Outer ECC Encoding) is performed, followed by internal IC encoding by the internal IC processing unit 205. In external IC encoding, the high-performance iron oxide magnetic tape is encoded with RS codes 112, 102, and 11, and the ordinary iron oxide tape is encoded with RS codes (82, 72, 11). Here, the RS code means a Reed-Solomon code. The first number in parentheses indicates the code length in number of symbols and the second number indicates information symbol number. A symbol is one byte of information consisting of eight bits. The third number represents the minimum distance between the signs. The internal IC code is processed with the same RS code (107,99,9) regardless of the type of tape. One external IC block consists of the number of SBs as long as the outer code length. Therefore, one track has three external IC blocks. For example, a high-performance iron oxide tape has 102 information SBs in one external IC block, so 306 SBs have information on one track and 30 SBs with parity. At the time of recording, the number of information SBs is 306 before the execution of the external IC, and the number of SBs to be recorded on the tape after the execution of the external IC is 336. Similarly, in a typical iron oxide tape, one track has 72 × 3 = 216 SBs of information SB, and after performing external IC encoding, parity SBs of 10 per external BC block are all 30 As many parity SBs as there are SBs are added, and as many as 246 SB of main data SBs are created in one track.

On the other hand, the sub data input through the buffer memory 207 is added to the sub data by the header adding unit 208, the internal call generation and the internal IC encoding is performed by the control unit 209. Internal IC encoding of sub data is set to RS codes (23, 19, 5).

The main data and the sub data processed as described above are combined by the additional circuit 210 and the selection circuit 211, and a synchronization signal and an identification signal ID are added thereto, as well as a dummy and a preamble. The preamble, postamble, and gap signal are added to the magnetic tape 213 through the signal recording unit 212 and the head. 5A and 5B, “51” is a dummy area, “52” is a preamble area, “53” is a subcode area, “54” is a postamble area, “55” is an IBG area, and “56” is a preamble area). "57" is a data recording area, "58" is a parity area, "59" is a postamble area, and "60" is a dummy area.

On the other hand, with reference to the embodiment of Figure 3 will be described in more detail the V-CAL recording process according to the present invention.

First, the stream (MPEG TS STREAM) input from the outside is alternately stored in the pair of first-in, first-out 302A, 302B through the multiplexer 301A. That is, when one first-in first-out 302A is filled with data, the data is written to the DRAM 305 through the multiplexers 303 and 304. If the DRAM 305 is being accessed, the data is accessed. Since the operation must wait until the end of the operation, the data input in the meantime is stored in the first-in, first-out 302B. The stream (MPEG TS STREAM) input in this manner is alternately stored in the pair of first-in first-out 302A, 302B, and stored in the DRAM 305 in the order of input. Of course, when storing the input data in the DRAM 305, the address is generated to satisfy the time stamp rule of the DVHS standard.

If the input data rate exceeds the average rate of the DVHS corresponding recording mode, it is stored in the next sync block SB according to the time stamp rule. In addition, when a large amount of data is inputted beyond the time stamp rule, a smooth buffer full signal is generated in the corresponding bank, so that the data storage operation to the DRAM 305 is not performed. Generates a smooth buffer interrupt.

In addition, when the input data rate is lower than the average rate of the corresponding recording mode, a dummy SB is inserted through the multiplexer 304 when necessary to satisfy the time stamp rule.

As described above, 2 bytes of the main header of the corresponding sync block and 1 byte of the data ox signal DATA-AUX are recorded immediately before the data storing operation is stored in the DRAM 305 through the multiplexer 304. To this end, the microcomputer 316 reads the contents previously stored in the main header register 315C and records the main header data.

For reference, when storing the MPEG packet stored in the first-in-first-out 302A, 302B in the DRAM 305, it is divided into two sync block units and recorded.

When six tracks of data (hereinafter, referred to as "one bank amount") are accumulated in one bank (for example, 305C) of the DRAM 305 through the above-described process, an external IC is stored for this data. An external parity is added by performing an ECC operation. This operation is performed through the second bank 305B, first-in, first-out 306A, 306B, and external IC seed processing unit 307, where the outer codeword rule of the DVHS standard is applied. .

The six-track amount means the number of tracks constituting the shuffling unit, where the number of sync blocks of main data per track is high-performance iron oxide magnetic tape according to the type of the magnetic tape 213 as described above. Is set to 306 and to 216 for ordinary iron oxide tape, it is possible to record or reproduce digital broadcast signals regardless of the type of the magnetic tape 213.

If you want to record the data on the recording medium at high speed, it will record at the same time by using 2 channels, so set the data part for one channel and track as master block, use "0" as its name, and the other channel. And set the data processing portion for the track as a slave block so that "1" is used as its name. In this case, in one bank, the master tracks are tracks 0, track 2, and track 4, and the slave tracks are tracks 1, track 3, and track 5. After the external IC encoding is completed, the time when the bank is completed is recorded. After reading the sync block stored in the first bank 305A of the DRAM 305, the internal IC encoding is performed through the internal IC processing unit 311. Stored in the first-in, first-out 313A, 313B through the multiplexer 312.

At this time, in order to output the recording data rec0_data and rec1_data at the target time, the format converter (not shown in the drawing) is a shuffle_p, which is a reference signal in bank units, among the timing reference signals generated by the timing generator (not shown in the drawing). Recording clock (e.g. 19.138560MHz) is counted based on (Release: shuffle_m, Slave: shuffle_s) and track_p (Master: track_m, Slave: track_s). After generating the reference signal, the microcomputer 316 starts data access of the DRAM 305 in advance in consideration of the time delay until the write data rec0_data and rec1_data are output.

In the master DCI 314A and the slave DCI 314B, the data stored in the first-in first-out 313A, 313B is read using a sync block reference signal in track units, and a synchronization signal ( After adding the Sync and the identification signal ID, the data is scrambled, the parallel data is converted into serial data, precoded, and output as the write data rec0_data and rec1_data. In this case, dummy, preamble, postamble, and gap signals other than the main data are oscillated by the DCs 314A and 314B and added to a predetermined position.

Referring to the recording process of the auxiliary data, the interface unit 315 receives additional information from the microcomputer 316 and stores the master track data and the slave track data in the subcode SRAMs 315A and 315B, respectively. When the request signal is input from the format converter at the time of writing the subcode area, the signal is sequentially output. The auxiliary data output as described above is encoded by the internal CC processing unit 3011 and then formatted by the DC IC 314A and 314B in a form suitable for recording.

Meanwhile, a process of processing a signal reproduced from the magnetic tape 213 will be described with reference to FIG. 4.

First, referring to the reproduction process of the main data, the data generated from the binary data ps0_data, ps1_data and the clock signal recovery circuit (not shown) which are read from the magnetic tape 213 and then equalized and sampled are processed. The associated clock signals px_clk19 and px_clk19 are input to the master DC 514A and the slave DC 514B.

At this time, the DC 514A, 514B detects a synchronization signal using the input serial clock signals px_clk19, px_clk19, data ps0_data and ps1_data, and uses the detected synchronization signal. To convert the parallel data into serial data. Also, the DCs 514A and 514B decode the data of the ID portion, descramble using the track pair number and sync block number included in the ID, and then first-in-first-out 513A, Store at 513B.

The track pair number and the sync block number are transmitted to a format converter through separate lines so that the output data of the first-in, first-out 513A, 513B is internally decoded by the internal IC processing unit 511. It can then be used to calculate the address of DRAM 505 when it is stored in DRAM 505.

When all data of one bank is stored in the DRAM 505 through the above process, the external IC is decoded using the external IC process unit 507. In the external IC decoding process, since the synchronization signal is not found or the failure is detected when the internal IC is decoded, the correction rate can be improved through error erasure decoding.

Only the normal play data is sequentially selected from the external IC decoded data and stored alternately in the first-in, first-out 503A and 503B. Before performing this process, the main header register ( 515C). Thereafter, time stamp values of the MPEG packets stored in the first-in first-out 503A and 503B are read, and the data of the first-in first-out 503A and 503B is output based on the time stamp value. In this way, all the data stored in the first-in first-out 503A, 503B is output, and the above process is repeatedly performed.

On the other hand, referring to the playback process of the auxiliary data, after the internal IC decoding process is completed, the auxiliary data in the sub code area is stored in the subcode SRAMs 315A and 315B, and the data is stored in the microcomputer. It is communicated externally through communication with the computer 516. The format ID information of the main header in the main area may be read by the microcomputer 516 when the main header information is processed.

On the other hand, Figure 7 is a signal flow diagram of a method for recording by recording the digital data recording format in accordance with the recording density of the magnetic tape as follows.

At this time, if the recording mode has been set by the user, the type of magnetic tape is determined. If the recording mode is not set, the corresponding function is given. (SA1-SA3) At this time, the magnetic tape is determined. The method is to mechanically discriminate between a high density tape or a low density tape based on a discriminating hole installed in a tape cassette, or select a recording rate when selecting a recording mode, that is, a user can select whether to record high density or low density. There are steps you can take to vary the way the tape is written by the user.

If the check result indicates that the tape currently inserted in the VRT is a high density tape such as a D-VHS tape or an S-VHS tape (or the user selects a recording mode for high-density recording), the MPEG TS packet is read. When storing the data in the sync block unit, the main data is stored in a predetermined sync block unit (e.g., m = 306), and the main data of the sync block unit is stored as many as the number of tracks (e.g., k = 6) constituting the shuffling unit. (SA4-SA10)

Subsequently, the main data of the shuffling unit is subjected to external ECC encoding and internal ECC encoding as described in the above description, and the data added with 30 parity and other additional information (sink block of 306 + 30 + 20 = 356) is 19.14. Output at the recording rate of MHz (SA11-SA13)

However, if the check result indicates that the tape currently inserted in the VRC is a low density tape such as a VHS tape (or the user selects a recording mode with low density recording), when storing the MPEG TS packet in the DRAM, Main data is stored in another sync block unit (e.g., m = 216), and the main data of the sync block unit is stored as many tracks (e.g., k = 6) constituting the shuffling unit. SA19)

Thereafter, the main data of the shuffling unit is subjected to external ECC encoding and internal ECC encoding as described above to record data having 216 + 30 + 20 = 266 (sink block of 216 + 30 + 20 = 266) added with 30 parity and other additional information. Output at rate (SA20-SA22)

8 is a signal flowchart of a method of reproducing a tape recorded as described above.

When the playback mode is set by the user, the type of the magnetic tape currently inserted in the VRC is determined, and the data recorded on the tape is read sequentially to perform internal IC decoding (SB1-SB4).

Subsequently, in performing external ECC decoding, an external call process is processed differently according to the type of the determined tape and outputted (SB5-SB8). That is, if the inserted magnetic tape is found to be a dense tape such as a tape for D-VHS or a tape for S-VHS, the outer code RS decoding is performed on the RS codes 112, 102, and 11 and three externals on one track. Since there is an outer group, 306 sync blocks are decoded per track to obtain 306 information sync blocks. If it is found to be a low density tape such as a VHS tape, the outer code RS code (82, 72, 11) are subjected to outer code decoding to decode 246 sync blocks per track to obtain 216 information sync blocks.

As described in detail above, the present invention can record or reproduce digital broadcast signals on all magnetic tapes of VHS, S-VHS, and D-VHS by varying the digital data recording format according to the recording density of the magnetic tape inserted into the VRC. This ensures the best possible picture quality while maximizing the quality of the given resources.

Claims (11)

A first step of determining the type of magnetic tape inserted in the V-Cal; A second step of storing the number of tracks in a shuffling unit by setting the number of sync blocks of main data per track as a reference value or an appropriate value below the reference value when storing the input data in the memory; And a third step of performing an external IC encoding and an internal IC encoding on the main data stored in the memory and recording the same on a recording medium. The method of claim 1, wherein the first step determines whether the tape is a high density tape or a low density tape based on a discriminating hole provided in the tape cassette. The method of claim 1, wherein the first step further comprises a step of selecting whether the high density recording or the low density recording is performed by the user. 2. The method of claim 1, wherein the second step sets the six tracks of main data in a shuffling unit and stores them in a bank of each memory. The second step sets the number of sync blocks of main data per track to 306 for high density magnetic tape, and sets the number of sync blocks of main data per track to 216 for low density magnetic tape. The recording signal processing method of V-C. 2. The recording process of VRC according to claim 1, wherein the second step sets the number of sync blocks of the main data per track differently and operates the memory in several bank units for internal and external IC processing. Way. The data recording method of claim 1, wherein the third step records data at a recording rate of 19.14 Mbps for one track for high density magnetic tapes, and writes the data at a recording rate of 14.3 Mbps for one track for low density tapes. A recording signal processing method of a V-C, characterized by recording. CLAIMS What is claimed is: 1. A method for reproducing a signal recorded on a tape having different magnetic characteristics in different formats, the method comprising: a first step of determining a type of a magnetic tape inserted in a V-Cal; When the data recorded on the magnetic tape is sequentially read out and internally decoded, and then stored in a DRAM and decoded externally, the decoded data is subjected to the reference number of outer code processing or less according to the determination result. A second step of performing external call processing of the; And a third step of sequentially selecting the normal play data after processing the main header and the auxiliary data when the external IC decoding is completed, and outputting them to the outside. 10. The reproduction signal processing method according to claim 8, wherein the first step is to discriminate between high density tape or low density tape based on the discriminating hole provided in the tape cassette. 9. The reproduction signal processing method according to claim 8, characterized in that up to 306 times of high density magnetic tape and up to 216 times of low density magnetic tape are processed when the external call is processed in the second step. . Medium discriminating means for discriminating whether the magnetic tape inserted in the V-Cal is a high-performance iron oxide magnetic tape or a normal iron oxide tape; A header adding unit for respectively adding a header to main data and sub data input from the outside; Storage means for storing the main data input through the header adding unit as many as the number of tracks in a shuffling unit, and differently setting the number of sync blocks of the main data for each track according to the type of the determined magnetic tape; Isc processing means for performing external isc encoding and internal isc encoding on the data stored in the storage means in a shuffling unit; Internal IC processing means for performing internal IC encoding on the sub-data to which the header is added; And an additional and selecting means for assembling the main data and sub data processed by the internal IC, and adding various additional signals.