JPS63181148A - Recording and reproducing device - Google Patents

Abstract

PURPOSE:To make the movement of a tape at high speed search recognized and to display a program time not recorded even at a high speed search by switching the mode from the program time display mode into the information display mode relating to the drive of a reel at the high speed search. CONSTITUTION:As a magnetic tape, a tape on which no program time is recorded or the time is recorded only a speriod of a start ID signal, is used. At the normal reproduction, the program time is interpolated based on the number of revolutions of the drum substantially based on the program time within the period or the start ID signal. However, the number of revolutions of the drum is not utilized at the high speed search. Then the program time display is switched to the information display relating to the number of revolutions of the reel, that is, the counter display or the program time is displayed through the interpolation from the value of the linear counter. Thus, the movement of the tape is made under standable even at the high speed search and the program time not recorded is displayed as if it were recorded on the entire tape.

Description

[Detailed description of the invention] The invention will be explained in the following order.

A. Field of industrial application B. Overview of the invention C. Prior art D. Problem to be solved by the invention E. Means for solving the problem (Fig. 1) F. Effect G. Circuit configuration of Example 01 (Fig. 1) 02 main body structure (Figure 2) Details of G3 display (Figure 3) G4 display operation (Figures 4 and 7) The present invention relates to a recording/reproducing device suitable for use.

B. Summary of the Invention This invention provides a method for recording a program within the period of the start ID signal or star ID signal only during playback using an unrecorded magnetic tape in which the program time is not recorded at all or in the period of the start ID signal. In a recording/playback device that interpolates program time based on time, tape movement during high-speed searches can be seen by switching from program time display mode to information display mode related to reel rotation during high-speed searches. In addition, it is possible to display unrecorded program time even during high-speed search.

C. Prior Art A digital tape recorder using a rotating head is known for recording an audio signal on a tape as a PCM signal.

This is called R-DAT, and the tape is wound for 90 minutes around a small drum with a diameter of about 30 mm, and two rotating heads with different azimuths placed 180 degrees apart are rotated at, for example, 2000 rpm+. and rotate these two rotating heads alternately over the tape 90 degrees.
” Scan intermittently every minute of each lap.

On the other hand, if the audio signal is sampled at a sampling frequency of 43
Sampling is performed at kHz, each sample value is linearly quantized with 16 bits to generate a PCM audio signal, which is time-compressed into a 90° wrap angle every 1/2 rotation time of the rotating head and transferred to the tape by the rotating head. 1 diagonally upward
Record each book as a trunk. And when playing,
The PCM signal from the two rotating heads is decoded and expanded to the original time axis, and then restored to an analog audio signal.

In this case, each track contains not only PCM data, but also tracking servo signals during playback, time codes, and subcodes such as program numbers inserted at the beginning of songs, etc., are recorded in an area separate from the PCM data. Ru.

Figure 8 shows the tape format of this R-DAT, in which a PCM audio signal is recorded in a slightly less than 60" area PCM within each track T within a 90' square range, and on both sides of this area PCM. Two area ATF (
A biloft signal for tracking servo is recorded at each angle of about 2.3°. Furthermore, sub-codes are recorded in two areas 5UB (about 5 degrees each) on both sides outside of this.

The reason why the biloft signal area ATF and subcode area SUB for tracking servo are provided in two places above and below each track is to prevent dropouts and to pick up as many subcodes as possible during high-speed searches. This is to do so.

Note that a guard area is formed between the areas PCM, ATF, and SUB, and the beginning and end of each track are defined as margin areas.

Among the subcodes, the program number is recorded for several seconds at the beginning of each side, for example, as follows.

That is, during recording, when recording is started from a stop state or a pause state, a start signal signal is recorded for, for example, 9 seconds at the beginning. This start ID signal is also recorded for the first 9 seconds of the next song when a no-signal interval between songs continues for 2 seconds or more during recording.

Furthermore, the song is recorded at an arbitrary position (for example, at a position thought to be the beginning of the song) by the user's button operation during recording. This recording of the start ID signal by manual operation by the user can also be performed during playback.

In this way, the tape is rewound where the start signal is recorded as part of the subcode in the area SUB at the beginning of the song.
When in program number recording mode, the device will start from the beginning of the tape (Star) while searching for the ID signal.
The ID signal is sequentially rewritten to the program number. Therefore, when a star ID signal is recorded at the beginning of each side, a serial number is written as a program number in the subcode area SUB for each song from the beginning of the tape.

In this case, eight subcode blocks are written in each subcode area SUB, but subcodes with the same content are written in the upper and lower areas of one track.

FIG. 9 shows the format of a subcode block, and one subcode block consists of 288 bits like a PCM data block.

Then, as shown in Figure 9A, the first 8 blocks of one block are
The bits are block synchronization signal 5YNC, the first 8-bit data W1 is the subcode ID, and the next 8-bit data W
2 is the subcode ID and the address signal of that block, the next 8 bits are the parity P for error correction generated for data W1 and W2, and the remaining 256 bits (8
One symbol is made up of bits, so it consists of 32 symbols) is subcode data and parity for error correction generated for the subcode data.

For more details, the 8-bit/7-bit data W□ and W2 are
It is as shown in Figure B.

That is, the MSB of data W2 is used to identify whether the block is a subcode block or a PCM data block, and when it is a subcode block, it becomes "1" as shown in the figure. Further, the lower 4 bits and 7 bits of data W2 are a block address, and the contents of subcode ID differ depending on whether the LSB is "0" or "1". When the LSB of the block address is "0", data W1 consists of a 4-bit control ID and a 4-bit data ID, and the upper 3 bits of the block address of data W2 are used as a format ID.

The start ID signal mentioned above is recorded as one bit of the control ID, and when it is "1" it indicates the beginning of the song, and when it is "0" it indicates the middle of the song.

When the LSB of the block address is “1”, the data W
1 and the upper three bits of data W2 indicate the program number. In this case, the program number is a 3-digit BC
Represented by D code, the upper 3 bits PNO-1 of the block address of data W2 are the most significant digit, the upper 4 bits PNO-2 of data W1 are the middle digit, and the lower 4 bits PN
O-3 represents the lowest digit, and the program number is represented from (001) to (799).

Note that (000) indicates that the program number is not recorded, and (OAA) indicates that the program number is invalid.

Four subcode blocks of which the LSB of the block address is rOJ and four subcode blocks of which the LSB is "1" are alternately recorded out of the eight blocks of each subcode area SUB.

Writing the program number based on the start ID signal described above means that if it is detected whether the start ID signal in the control TD of Wl, which is the subcode ID, is "1" and it is "1", the program number is written based on the start ID signal.・LSB of Tsuk address
The program number is written in the subcode program 7 with "1" ((OAA) is sequentially rewritten for each song).

D Problems to be Solved by the Invention By the way, in such an R-DAT, if the program time is not recorded entirely (or is recorded only in the start ID Shingetsu period), the program time is FF (FF). 9. During high-speed searches such as forward) searches and REW (@return) searches, interpolation is not possible, and the display must remain as it was before the search, or the display must be erased. The drawback is that you cannot tell if it is moving.

This invention has been made in view of the above, and an object thereof is to provide a recording and reproducing device that allows the movement of a tape to be seen during a high-speed search and also allows the display of unrecorded program time even during a high-speed search. It is.

E. Means for Solving the Problems The recording and reproducing apparatus according to the present invention uses a magnetic tape in which no program time is recorded or in which the program time is recorded in the period of the start ID signal, and only the start ID signal or the program time is recorded during reproduction. A recording/reproducing device that interpolates a program time based on a program time within a period of a start ID signal is configured to switch from a program time display mode to an information display mode related to the rotation of reels during a high-speed search.

F. As the working magnetic tape, use is made a magnetic tape on which no program time is recorded or on which the program time is recorded only during the period of the start ID signal. During normal playback, the program time is interpolated substantially based on the drum rotational speed based on the program time within the period of the start 10 signal or start ID signal. However, during high-speed search, the drum rotational speed cannot be displayed. Therefore, during a high-speed search, the program time display is switched to an information display related to the rotation of the reels, that is, a counter display, or the program time is displayed by interpolating from the value of the near counter. This makes it possible to see the movement of the tape even during a high-speed search, and even during a high-speed search, it is possible to display the unrecorded program time as if it were all recorded.

G. Embodiment Hereinafter, a case in which an embodiment of the present invention is applied to an R-DAT will be explained in detail based on FIGS. 1 to 7.

01 Circuit Configuration Figure 1 shows the circuit configuration of this embodiment. In the figure, first, the signal system will be explained. During recording, the input analog audio signal is band-limited by the low-pass filter (1). After that, it is supplied to the A/D/D/A converter circuit (2) and converted into a digital signal, which is then supplied to the encoder section of the error correction encoder and decoder circuit (3) and converted into a PCM signal for each block. At the same time, interleave processing, parity for error correction, block synchronization signals, block address signals are added, and subcodes are inserted.

During this recording, the switch circuits (4) and (8) are switched to the recording side REC by a switching signal from the circuit (3) in synchronization with the switching of the circuit (3) to the encoder. and,
From circuit (3), the output of the audio signal is HA or HB.
The half-time light signal with parity etc. added is 90
A PCM audio signal time-compressed to the rotation length is obtained in the tape contact section of the rotary heads HA and HI3, and this is transmitted to the switch circuit (4), the recording amplifier (5), the switch circuit (8) and the head. The signal is alternately supplied to the rotary heads HA and HB via the changeover switch circuit (9), and is sequentially recorded as diagonal tracks on the tape (10).

The head changeover switch circuit (9) is operated by a head changeover signal from the circuit (3) so that the PCM signal compressed in time for 90° rotation is supplied to the head that contacts the tape (lO). It is alternately switched to side A and side B every two rotations.

Next, during playback, the switch circuit (8) is switched to the PB side by the switching signal from the circuit (3), and the head selector switch (9) is switched between the rotating heads HA and HB as in the recording mode. The heads HA and HB are alternately switched to the side that contacts the tape (10).
The PCM signal reproduced from the tape (10) is supplied to the reproduction process circuit (7) via the reproduction amplifier (6), where it is subjected to reproduction equalization processing, bit synchronization is established, and shaped into digital data. , a reproduced clock is obtained by the PLL circuit.

The PCM data from this reproduction process circuit (7) is supplied to an error correction encoder and decoder circuit (3). During this re-transmission, the circuit (3) functions as a decoder, and the PCM signal is decoded after error correction and the like.

The decoded signal is A/D, D/A converter (2)
is converted back to an analog signal by the D/A converter,
The audio signal is played back through a low pass filter.

Next, to explain the head drum, tape running control system, etc., (11) indicates the drum, which has a 180°
The two rotating nozzles HA and HB are installed in a state that slightly protrudes from the surface of this 1:ram (11), and the drum motor M1 normally rotates 200 Orr.
It is rotated in a constant direction at a rotation speed of pm.

(12) is a rotation detecting means for the drum motor M□, from which a frequency signal DFG proportional to the drum rotation number (head rotation speed) and a signal opa indicating the head rotation phase are obtained.

(lO) is a magnetic tape, which is unwound from a supply reel (13) and is passed diagonally around a 90° angle around the drum (11), and then transferred to a capstan (14) and pinch roller (15 ) and is wound onto the take-up reel (16).

Capstan (14) is capstan drive motor M2
The tape is rotated and fed.

(17) is a rotation detecting means of this motor M2, from which a frequency signal cpa proportional to the rotation speed of the motor M2 can be obtained.

M3 and M4 are reel motors that drive reels (13) and (16), respectively, and rotation detecting means (18).
) and (19), the rotation speeds of these motors M3 and M4 are detected, and from this, frequency signals Ts and TT proportional to the rotation speeds are obtained.

Further, (20) is a system controller (hereinafter abbreviated as system controller), (21) is a capstan and drum servo circuit, (22) is a reel drive control circuit, (2
3) is a calculation device for reel drive control, (2)
4) is a search control circuit, and (25) is a brake means.

In addition, (26) is an input device equipped with various operation buttons, (
27) is a display that displays the tape running direction, recording/playback display, program number, etc.

Rotation from rotation detection means (12) HA, I-IB
A signal DFG indicating the rotation speed and a signal DP indicating the rotation phase of
G and the capstan (1) from the rotation detection means (17)
The signal CFG indicating the rotational speed of step 4) is supplied to the capstan and drum servo circuit (21). The servo circuit (21) receives signals from the system controller (20) and generates signals for controlling the rotational speed and rotational phase of the motor M1 during recording and normal playback.
A signal is generated to keep the tape feeding speed constant.

G2 body structure Figure 2 shows the structure of the R-DAT body.
) is the main unit, (31) is the power switch, and (32) is the cassette tray.Insert the cassette tape into the cassette tray (32) with the window side up and the erase prevention tab facing you. . (33) to (36) are start ID buttons, (33) is an auto button, (3
4) is a manual button, (35) is an erase button, and (36) is a beam number button.

In the case of the auto button (33), when the auto display is lit, the start ID signal is automatically recorded during recording. If the auto display is not lit, press this auto button (33). A start ID signal is recorded for 9 seconds each time a synchronized signal is sent, such as at the beginning of a song, or whenever the recording level rises again after falling below a certain level for 3 seconds or more.

For manual button (34), star 1 is displayed when recording.
-Press to record the ID signal at a desired location (manual display lights up). The Star 1-ID signal is recorded for 9 seconds from the point where it is pressed.

In the case of the erase button (35), press it to erase the start ID signal. If the start ID signal and program number are recorded, both are erased.

For the renumber button (36), set the program number to 1.
Press this button to restart the program from start to finish. If only 10 start signals are recorded, use this method to change the program number to 1.
You can shake it in order from

(37) to (39) are counter buttons, which are used to switch the counter display, reset/reset the counter, and memorize the reset point. (37) is the mode button, and (38) is the reset button. button (39) is a memory button.

In the case of the mode button, the counter display (tape running time, elapsed playing time of the song, remaining time) is switched each time the button is pressed. If the reset button (38) is pressed while the counter is displayed on the display, the counter will be reset to 0+n0Os. Memory button (39
), it turns on when pressed when the counter display is displayed.
Store the position of 00s. When you press the rewind button to rewind, the tape stops at 0m0Os. If you press the play button while pressing the rewind button, it will rewind to 0m0Os, and playback will automatically start from there.

(40) and (41) are skip ID buttons,
It is used to record and erase the skip ID signal, (40)
(41) is a write button, and (41) is an erase button.

In the case of the light button (40), press it at the point where you want to skip when listening later during recording or playback.When pressed, the light lights up momentarily and a skip ID signal is recorded for 1 second. In the case of the erase button (41), it is pressed to erase the previous skip ID signal.The button's display is blank when the tape is being rewound, and lights up while the skip ID signal is being erased.

(42) is a numeric keypad (θ to 9), and when a desired number is pressed before recording starts (while recording is paused), the song number is automatically incremented from that number.

When playing, use this button to select the track number of the song you want to listen to, and press the start button to start playing from the beginning of that song.

(43) is a recording level adjustment knob, and the recording level is adjusted while watching the peak level meter.

The outside is for the L channel and the inside is for the R channel, and both channels can be turned at the same time.

Reference numeral 44 indicates a timer switch, which is normally turned off and is switched when recording or reproducing at a desired time using a separately provided timer.

(45) is a headphone jack, (46) is a remote control light receiving section, and (47) is a cassette tray opening/closing button.

(48) to (54) are tape operation buttons;
8) is the stop button, (49) is the play button, (5)
0) is the AMS button; press it to continue the sequence in the left direction (+44), and press it to cue the beginning in the forward direction (state). (51) are the fast forward/cue (Oki) - and rewind/review (@) buttons; when pressed in the play state, it becomes a cue or review, and when pressed in the stop state, it becomes fast forward or rewind. (52) is the recording button, (53)
is a pause button, and this pause button (53) is automatically released after approximately 10 minutes in a paused state, and the deck is placed in a stopped state. (54) is a recording miniting button.

(55) is a clear button, and when you press the wrong song number, if you press this button before pressing the start button, the song number will disappear. (56) is a skin switch, which is turned ON when you want to skip from the point where the skip ID signal was recorded to the next star ID signal during playback, and turned OFF when you want to skip all of the signals without skipping. (57) is an input selection switch, and the input source during recording is ANALOG (when recording from a device connected to the LINE IN terminal), DIGITAL.
(When recording from a device connected to the DIGITAL IN terminal). (58) is a start button, and if you select the number of the song you want to listen to using the number buttons (42) and then press this button, the song will be played immediately from the beginning. If you press this button when stopping or playing, the first 8 seconds of each song will be played and then the next song will be played (Music Scan).

Details of G3 Display Figure 3 shows details of the display (27).
60) is a counter display section, which indicates that the approximate tape running time is being displayed on the counter. (61) is a Remaining (1?EMAINING) display section, which indicates that the approximate remaining time until the end of the tape is being displayed on the counter. (62) is a memory display section, and the memory button indicates that 0m0Os is stored. (63) is the program time (PGM TI
ME) A display section that indicates that the elapsed time of the current song is being displayed on the counter.

Reference numeral (64) is an emphasis display section, and when a tape with emphasis applied is played back, de-emphasis is automatically applied and the emphasis display is lit. The display also lights up when recording a source with emphasis applied to DIGITAL IN.

Lights up when recording with LINE IN. (
65) is a PGM (music number) display section, which displays the current tune number if a program number is recorded. (6
6) is the AMS (song cue) display section, and when button (50) is pressed, the number buttons (4
2) When pressed, the number (track number) is displayed while searching for the desired track.

Reference numeral (67) is a digital copy prohibition display section, which blinks if there is a digital copy prohibition code when digital dubbing is performed. In this case, recording is not possible. (68)
is a CAUTION display section, and if water droplets form due to condensation while the deck is in operation, this display will flash and the operation will stop.

(69) is the search display section, and when the button (50) is pressed or when direct song selection is performed by specifying the song number,
Lights up during skip operation. (70) is star t-I
The D display section blinks while the start ID signal is being recorded (for approximately 9 seconds) or during erasing, and lights up while the portion where the start ID signal is recorded is being reproduced. (71) is a skip ID display section, in which a skip ID signal is being recorded (
It lights up momentarily when a skip ID signal is recorded (about 1 second), during erasing, or when a skip ID signal is recorded during playback.

(72) is the sampling frequency display section, which lights up in accordance with the sampling frequency of the digital program source (32kllz: DBS (Direct Eri Broadcasting)
, 44.1kllz: Recorded DAT soft tape,
48kllz: DBS, DAT recording/playback). A peak level meter (73) indicates the peak value of the recorded signal level during recording, and indicates the peak value of the recorded signal level during playback. (74) is a counter that displays the running time of the tape, the elapsed time of the current song, and the remaining amount of time until the end of the tape.

Each time the mode button (37) on the counter is pressed, the displayed content changes.

G4 Display Operation Next, the method of displaying the program time will be explained with reference to FIGS. 4 to 7.

(Program time is not recorded at all or is star)
On a tape recorded only during the ID signal period,
The state of the program time display, that is, the display (2
7) Program time display section (63) (Figure 3)
r PGM TIMEJ is displayed and the counter (74
) represents the program time and in order to be able to see the movement of the tape when a high-speed search operation is performed, in the first embodiment, the program time is displayed as a counter only during the high-speed search. That is, the display
(27) Counter display section (60) (3rd rgJ)
r C0UNTERJ (!l: Shi counter (74
) is the tape running time.

After the high-speed search is completed, the program time display mode is returned to.

FIG. 4 shows a flowchart of the first embodiment in which the program time display mode is switched to the counter display mode during high-speed search. In FIG. The system controller (20) determines whether or not the program time is being displayed, and if it is, the display mode is switched to the counter display mode in step (c). Then, in step (d), the program time flag is set, and in step (e), the process returns.

Note that if the program time is not being displayed in step (B), the process immediately advances to step (E) and returns.

Next, in FIG. 4B, when the high-speed search is completed in step (g), the system controller (2o) determines whether there is a program time flag in step (g), and if there is a program time flag, it is determined in step (h). Returns the display mode to program time display mode.

Then, in step (S), the program time flag is reset, and in step (N), the process returns.

Note that if there is no program time flag in step (g), the process immediately proceeds to step (s) and returns.

In the second embodiment, a counter (7
4) The display by the segment display element is a display (pattern) that shows the tape running, and after the high-speed search is completed, the display returns to the program time display.

5 and 6 show display examples of the segment display element according to the second embodiment, and the normal program time is
It is displayed as shown in Figure A. Then, at the time of FF siren, it is displayed as shown in FIG. 5B. In other words, the broken lines are erased, and only the parts indicated by the solid lines are displayed. This tells you the direction of tape movement. At the time of REW search, it is displayed as shown in FIG. 5C. This shows that the direction of tape movement is opposite to that in the FF search.

Although FIG. 5 described above shows the case where the same pattern continues to be displayed during high-speed search, the display portion may be rotated in the direction of the arrow as shown in FIG. 6. The timing of this rotation is more effective if it is performed at the search speed.

In the third embodiment, the program time display is interpolated from the value of a linear counter (not shown) that receives reel rotation information provided in the system controller (20) during high-speed search. Here, the program time is based on the start ID signal, and the REW search is displayed as "-", or if the time information of the song is known in playback mode, the estimated program time is displayed based on that information. good.

FIG. 7 shows a case where the linear counter value is interpolated and displayed according to the third embodiment. In the figure, the solid line represents the change in the linear counter time, and the broken line represents the change in the program time. Start ID signal ST- during playback
At the rising edge of IDi, the program time is 0M00s, and during playback from OM00s to 2M05S, the program time is displayed in accordance with the rotation of the drum.

At this time, the near counter is IIM 1 from 9M 08s.
It has changed up to 3s. When the FF search is started, the drum rotation can no longer be used, so the program time is essentially interpolated using the value of the linear counter. That is,
The program time between the start ID signal ST-I DI and the next start ID signal 5T-ID2 can be calculated from K9M08S, where K is the near counter time, so based on this formula, the start ID signal 5T-
The program time corresponding to the linear counter time during the OFF search between IDI and 5T-ID2 is determined. For example, when the pick-up linear counter time is 11M 13S, the program time is 2M 05s, and the linear counter time is 12M 15
When S, the program time can be determined as 3 M O19. Then, the program time obtained is F
Medium heat next display during F search.

If a new start ID signal comes during this program time transition, the program time returns to OM 00s. The fact that the program time is OM 00s when the start ID signal 5T-ID2 arrives in FIG. 7 represents this state.

Similarly, if the linear counter time is K, then the program time of the song related to the star) ID signal ST-I D2 is K.
-13M It can be determined from OO3.

Next, when the operation mode enters REW search from playback, drum rotation is no longer available in this case as well, so the program time is essentially interpolated using the value of the linear counter as described above. That is, the program time between the start ID signal 5T-IDI and the previous start ID signal ST-ID3 can be calculated from K9M08S as described above, so based on this formula, the program time between the start ID signal 5T-ID2 and 5T-ID3 Find the program time corresponding to the linear counter time during REW search. For example, when the near counter time is 8M05s, the program time is -I
When MQ3s and linear counter time are 6M48s, the program time can be calculated as -2M20s. Then, REW the obtained program time.
Displays the table in order during the search.

In this case as well, if a new start ID signal comes while the program time is changing, the program time will change to OM 00s.
Return to In FIG. 7, the start ID signal 5T-ID
This state is represented by the program time being OM 00s when the number 3 comes.

Similarly, the program time of the song related to the start ID signal ST-ID3 is K −, where K is the linear counter time.
It can be obtained from 5M40s.

However, displaying "-" to display the program time during this REW search indicates how much time has passed since the end of the song, which is unnatural in terms of usability.

Therefore, I would like to display how much time has elapsed since the beginning of the song (star ID signal), that is, the program time in the same way as FF search.

To do this, if you know the time information of a song (program) in normal playback mode, you can display the estimated program time based on that information. Incidentally, in Figure 7, the program time information for REW search (Y3 M28S (9MOBS
5M40S), so from this, the program time of -I M 03s (representing 11403s from the end of the song) is 2M25S (representing 11403s from the beginning of the song).
3N428s-IMO3S).

This means that the corresponding linear counter time is the same <2M25s
(8M 05s-5M 40s) It can be seen that it is correct because it has passed. Also, the program time of -2M 20s is converted from the beginning of the song to IM 08s.
(3M 28s 2 M 20s). In this manner, in the case of a REW search, if the time information of a song is known, it is possible to naturally display the songs starting from the beginning, similar to the FF search.

In this way, in the first embodiment, since the counter is displayed during high-speed search, the movement of the tape can be clearly seen in both direction and speed.

Furthermore, in the second embodiment, the movement (direction) of the tape is displayed separately during a high-speed search, so the movement (direction) of the tape can be determined, and the search speed can also be determined by linking the rotation timing of the arrow with the search speed.

Furthermore, in the third embodiment, by interpolating the program time based on the value of the linear counter during high-speed search, it is possible to display the program time as if it were recorded over the entire tape. Also, when searching for REW, the time of the song is not known, so the display is negative, but once you know the time information of the song in playback mode, the program time is automatically displayed from the beginning of the song based on that information. can.

1-1 Effects of the Invention As described above, according to the present invention, the program time display mode is switched from the program time display mode to the information display mode related to the rotation of the reel during a high-speed search. Even when searching, unrecorded program time can be virtually displayed.

[Brief explanation of the drawing]

Fig. 1 is a circuit configuration diagram showing an embodiment of the present invention, Fig. 2 is a perspective view showing the external appearance of an R-DAT to which the invention is applied, Fig. 3 is a detailed view of its display, and Fig. 4 is a flowchart for explaining the operation of this invention, FIGS. 5 to 7 are diagrams for explaining the operation of this invention,
FIG. 8 is a diagram showing an example of a tape format used in R-DAT, and FIG. 9 is a diagram showing an example of the format of a subcode recorded in a subcode area of a recording track. (10) is a magnetic tape, (13) is a supply reel, (16)
) is the take-up reel, (20) is the system controller,
(21) is a capstan and drum servo circuit, (22)
) is a reel drive control circuit, (23) is an arithmetic unit, and (27) is a display.

Claims (1)

[Claims] If a magnetic tape is used in which no program time is recorded or recorded in the period of the start ID signal, only the start ID signal or the program time within the period of the start ID signal is recorded. What is claimed is: 1. A recording and reproducing device that interpolates a program time at a time, the recording and reproducing device being characterized in that the program time display mode is switched from a program time display mode to an information display mode related to the rotation of reels during a high-speed search.