JP2595515B2 - Recording and playback device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention will be described in the following order.

A Industrial Fields B Outline of the Invention C Prior Art D Problems to be Solved by the Invention E Means for Solving Problems (FIG. 1) F Function G Embodiment G ₁ Circuit Configuration (FIG. 1) ) G ₂ body structure (Fig. 2) G ₃ display details (FIG. 3) G ₄ display operation (Fig. 4) field of the effect a industry H iNVENTION the present invention, for example, a tape deck, a disk player or the like The present invention relates to a preferable recording / reproducing apparatus using the same.

B. Summary of the Invention The present invention relates to a program for recording a start time of a start ID signal or a start time of a start ID signal only at the time of reproduction using a magnetic tape on which no program time is recorded or a start ID signal is not recorded. In the recording / reproducing apparatus that interpolates the program time based on the program time, by switching from the program time display mode to the information display mode related to the rotation of the reel at the time of high-speed search, the movement of the tape at the time of high-speed search can be understood. And a program time that is not recorded even at the time of high-speed search.

C. Related Art As a digital tape recorder for recording an audio signal as a PCM signal on a tape, a digital tape recorder using a rotary head is known.

This is called R-DAT and has a diameter of, for example, 3
The tape is wound around a small drum of about 0 mm by 90 °, and two rotating heads having different azimuths arranged at 180 ° are rotated at, for example, 2000 rpm, and these two rotating heads are alternately rotated 90 ° on the tape. Intermittent scanning is performed for each lap.

On the other hand, when the audio signal
Sampling at kHz, 16-bit linear quantization of each sample value to generate a PCM audio signal, time-compressing it to 90 ° wrap angle every 1/2 rotation time of the rotating head, Is recorded as one diagonal track. During reproduction, the PCM signals from the two rotary heads are decoded and expanded to the original time axis, and then returned to the analog audio signal.

In this case, not only the PCM data but also the tracking servo signal during playback, as well as the subcodes such as the time code and the program number inserted at the beginning of the song, etc., are recorded on each track in an area different from the PCM data. You.

FIG. 7 shows the tape format of this R-DAT, in which the PCM audio signal is recorded on each track T within a 90 ° angular range.
Is recorded in the area PCM at a little less than 60 °, and two areas ATF on both sides of this area PCM (each about 2.3
In (°), a pilot signal for tracking servo is recorded. Further, subcodes are recorded in two areas SUB (each about 5 °) on both sides on the outside.

The pilot signal area ATF and the sub-code area SUB for the tracking servo thus have two upper and lower tracks.
The reason for this is to cope with dropouts and to make it possible to pick up sub-codes as much as possible during high-speed search.

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

The program number among the subcodes is recorded at the beginning of each song for several seconds, for example, as follows.

That is, when recording is started from a stop state or a pause state during recording, a start ID signal is recorded, for example, for 9 seconds at the beginning. During recording, the start ID signal is recorded at the beginning of the next song when a non-signal section between the songs lasts for more than 2 seconds, for example.
Also recorded for seconds. In addition, recording is performed at an arbitrary position (for example, at a position considered to be the beginning of a song) by a user's button operation during recording. The recording of the start ID signal by manual operation by the user can be performed at the time of reproduction.

Thus, at the beginning of the song, the tape on which the start signal was recorded as part of the subcode in the area SUB was rewound,
In the program number recording mode, the device searches for the start ID signal from the beginning of the tape,
An operation of sequentially rewriting signals to program numbers is performed. Therefore, when a start ID signal is recorded at the beginning of each song, a serial number is written in the subcode area SUB as a program number for each song from the beginning of the tape.

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

FIG. 8 shows the format of a sub-code block. One sub-code block is composed of 288 bits, like the PCM data block.

Then, as shown in FIG. 8 A, 1 8-bit at the beginning of the block, the block synchronizing signal SYNC, data W ₁ are sub-code ID in the next 8 bits, the sub-code ID data W ₂ for the next 8 bits And the address signal of the block, the next 8 bits are parity P for error correction generated for data W ₁ and W ₂ , and the remaining 256 bits are 32 bits (8 bits form one symbol and 32 symbols) Code data and error correction parity generated for the code data.

8 data W ₁ and W ₂ bits, and more particularly FIG. 8 B
It is as shown in the following.

That, MSB data W ₂ are used for that block to identify whether the sub-code block or a PCM data block, this is when the subcode block is "1" as shown in FIG. The lower 4 bits of data W ₂ is a block address, the LSB contents of the subcode ID are different "0" or "1". LSB of block address is "0"
In the case of, data W ₁ is a 4-bit control ID and 4
Made from the data ID of bits, upper three bits of the block address of the data W ₂ is the format ID.

The start ID signal described above is recorded as one bit of the control ID. When the start ID signal is "1", the start of the music is set.

Data W ₁ when the LSB of the block address is “1”
And the upper three bits of the data W ₂ indicates the program number. In this case, the program number is represented by BCD code 3 digits, the top three of the block address of the data W ₂
Bit PNO-1 is the most significant digit, the data W ₁ upper 4 bits P
NO-2 represents the middle digit, the lower 4 bits PNO-3 represents the least significant digit, and the program number is [00
1] to [799]. [000] indicates that no program number is recorded, and [0AA]
Indicates that the program number is invalid.

The subcode block whose LSB of the block address is "0" and the subcode block whose value is "1" are alternately recorded by 4 out of 8 blocks in each subcode area SUB.

Because writing the program number on the basis of the above-mentioned start ID signal, a start ID signal in a control ID of W ₁ is a sub-code ID is detected whether the "1" and "1"
, The program number is written to the subcode block whose LSB of the block address is “1” ([0A
A) 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 at all or is recorded only during the period of the start ID signal, the program time is reduced.
At the time of high-speed search such as FF (fast forward) search or REW (rewind) search, interpolation cannot be performed, and the display before the search must be kept or the display must be turned off. Therefore, there is a disadvantage that it is not possible to know how the tape moves during the high-speed search.

The present invention has been made in view of the above points, and provides a recording / reproducing apparatus capable of displaying the movement of a tape during a high-speed search and displaying a program time that has not been recorded even during a high-speed search. It is.

E Means for Solving the Problem The recording / reproducing apparatus according to the present invention provides a start ID signal or a start ID signal only at the time of reproduction using a magnetic tape on which no program time is recorded or which is not recorded during the period of the start ID signal. In a recording / reproducing apparatus that interpolates a program time based on a program time in a period of a start ID signal, a mode is switched from a program time display mode to an information display mode related to reel rotation during a high-speed search.

F function As the magnetic tape, a magnetic tape on which no program time is recorded or which is recorded only during the period of the start ID signal is used. Then, during normal normal reproduction, the program time is interpolated substantially based on the number of rotations of the drum based on the start ID signal or the program time within the period of the start ID signal. However, at the time of high-speed search, it cannot be displayed from the number of rotations of the drum. Therefore, at the time of high-speed search, the program time display is switched to information display relating to the rotation of the reel, ie, a counter display, or the program time is displayed by interpolating from the value of the linear counter.
As a result, the movement of the tape can be recognized even at the time of the high-speed search, and the program time that has not been recorded even at the high-speed search time can be displayed as if it had been recorded over the entire time.

G Embodiment Hereinafter, an embodiment in which one embodiment of the present invention is applied to an R-DAT will be described in detail with reference to FIGS. 1 to 6.

G ₁ Circuit Configuration FIG. 1 shows the circuit configuration of the present embodiment. First, the signal system will be described. At the time of recording, the input analog audio signal is band-limited by the low-pass filter (1). Thereafter, the digital signal is supplied to an A / D / D / A converter circuit (2) and converted into a digital signal. The digital signal is supplied to an encoder section of an error correction encoder and decoder circuit (3) and converted into a PCM signal for each block. At the same time, addition of an interleave process, parity for error correction, a block synchronization signal, a block address signal, insertion of a subcode, and the like are performed.

During this recording, the switch circuits (4) and (8) are switched to the recording REC by a switching signal from the circuit (3) in synchronization with the switching of the circuit (3) to the encoder. And
From the circuit (3), a PCM audio signal obtained by time-compressing a signal corresponding to a half rotation of the head HA or HB of the audio signal to 90 ° rotation with a parity or the like added thereto is converted to a rotating head H
This is obtained in the tape contact section of A and HB, which is supplied to the rotary heads HA and HB via the switch circuit (4), the recording amplifier (5), the switch circuit (8) and the head changeover switch circuit (9). The tapes are supplied alternately and sequentially recorded on the tape (10) as one diagonal track.

The head changeover switch circuit (9) operates according to the head changeover signal from the circuit (3) so that the PCM signal time-compressed by 90 ° rotation is supplied to the head in contact with the tape (10). The mode is alternately switched between the A side and the B side every two rotations.

Next, at the time of reproduction, the switch circuits (4) and (8) are switched to the PB side by a switching signal from the circuit (3), and the head changeover switch (9) is set to one of the rotary heads HA and HB similarly to recording. It is alternately switched to the side that comes into contact with the tape (10). The PCM signal reproduced from the tape (10) by the heads HA and HB is supplied to a reproduction process circuit (7) via a reproduction amplifier (6), where a reproduction equalizer process is performed and bit synchronization is performed, and digital reproduction is performed. The data is shaped into data, and the recovered clock is obtained by the PLL circuit.

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

The decoded signal is D / A of A / D, D / A converter (2)
The signal is returned to an analog signal in the converter section, and the audio signal is reproduced through a low-pass filter.

Next, a head drum and a tape running control system will be described. (11) shows a drum, in which two rotary heads HA and HB are separated from each other by 180 ° from the peripheral surface of the drum (11). Attached in a slightly protruding state,
The drum motor M ₁ typically is rotated in a predetermined direction at 2000rpm of rotating speed.

(12) the frequency signal proportional to the drum rotation speed than that in the rotation detector of the drum motor M ₁ (head speed)
D _FG and a signal D _PG indicating the head rotation phase are obtained.

(10) is a magnetic tape, which is drawn out from a supply reel (13), is wrapped obliquely within a 90 ° angle range of the peripheral surface of the drum (11), and is then moved to a capstan (14) and a pinch roller (1).
5) It is wound up on the take-up reel (16).

Capstan (14) is rotated by a capstan driving motor M _2, the tape feeding.

(17) in the rotation detecting means of the motor M _2, which from the frequency signal C _FG proportional to the rotational speed can be obtained.

M ₃ and M ₄ are each reel motor for driving the reel (13) and (16), each rotation detecting means (18) and (19), the rotational speed of the motor M ₃ and M ₄ are detected,
As a result, frequency signals T _S and T _T proportional to the rotation speed are obtained.

Also, (20) is a system controller (hereinafter abbreviated as syscon), (21) is a capstan and drum servo circuit, (22) is a reel drive control circuit, (23) is an arithmetic unit for reel drive control, 24) is a search control circuit, and (25) is a brake means.

(26) is an input device having various operation buttons,
(27) is a display for displaying the tape running direction, recording / reproducing display, program number and the like.

A signal D _FG indicating the number of rotations of the rotary heads HA and HB from the rotation detecting means (12), a signal D _PG indicating the rotation phase, and a signal C indicating the rotation speed of the capstan (14) from the rotation detecting means (17). _FG is capstan and drum servo circuit (21)
Supplied to Then, the feed tape to the motor M ₂ together with the servo circuit (21) is the system controller (20) when the signal receiving and recording from and normal reproduction generates a signal for controlling the rotational speed and the rotational phase of the motor M ₁ Generates a signal that keeps the speed constant.

G ₂ body structure FIG. 2 shows the structure of the body of the R-DAT, (30)
Is a main body, (31) is a power switch, and (32) is a cassette tray. The cassette tray (32) is inserted with the cassette tape window facing upward with the erroneous erasure prevention tab facing forward. (33) to (36) are start ID buttons, (33) is an auto button, (34) is a manual button, (35) is an erase button, and (36) is a renumber button.

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

For manual button (34), start when recording
Press to record the ID signal at any location (manual display lit). The start ID signal is recorded for 9 seconds from the point where the button is pressed.

Press to erase the start ID signal for the erase button (35). If the start ID signal and the program number are recorded, both are erased.

In the case of the renumbering button (36), the program number is 1
Press to start over in order. When only the start ID signal is recorded, the program number can be sequentially changed from 1 by this method.

(37) to (39) are counter buttons used for switching the counter display, resetting the counter, and storing the reset point. (37) is a mode button,
(38) is a reset button, and (39) is a memory button.

In the case of the mode button, the mode is switched each time the counter display (tape running time, music playing elapsed time, remaining time) in the display window is pressed. When the reset button (38) is pressed when the counter is displayed on the display, the counter is reset to 0m00s. If the button for memory (39), stores the position of the press the 0 _M 00s when the counter display is out. When you press the rewind button and rewind, the tape stops at 0m00s. Pressing the play button while pressing the rewind button rewinds to 0m00s, from which playback starts automatically.

(40) and (41) are skip ID buttons used for recording and erasing skip ID signals. (40) is a write button and (41) is an erase button.

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

(42) is a numeral (0-9) button, that is, a numeric keypad. When a desired number is pressed before recording is started (recording is paused), a song number is automatically assigned from that number.
During playback, use this button to select the song number of the song you want to hear. When you press the start button, playback starts from the beginning of the song.

(43) is a recording level adjustment knob, which adjusts the recording level 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) denotes a timer switch, which is normally turned off, and is switched when recording or reproduction is performed 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 open / close button.

(48) to (54) are tape operation buttons, and (48)
Is the stop button, (49) is the play button, (50) is AM
S button left direction Press to read the data with Press to find the start with. (51) is fast forward / cue And rewind / review When the button is pressed in the play state, it becomes a cue or a review, and when it is pressed in the stop state, it becomes fast forward or rewind.
(52) is a recording button, (53) is a pause button, and this pause button (53) is automatically released when paused for about 10 minutes, and the deck is stopped. (54) is a recording muting button.

(55) is a clear button, and when the track number is mistakenly pressed, if the button is pressed before the start button is pressed, the track number disappears. Reference numeral (56) denotes a skip switch, which is turned on when it is desired to listen to the next start ID signal from the point at which the skip ID signal is recorded during reproduction, and turned off when it is desired to listen to the entire signal without skipping. (57) is an input changeover switch for input source AN during recording.
Switches between ALOG (when recording from a device connected to the LINE IN jack) and DIGITAL (when recording from a device connected to the DIGITAL IN terminal). A start button (58) is used to select a song number of a song to be listened to by using the number buttons (42) and then press this button to immediately start playback from the beginning of the song. When pressed during stop or playback, each song is played for about 8 seconds at the beginning, and then sent to the next (music scan).

G ₃ Display details Figure 3 shows the details of the display (27).
(60) is a counter display unit, which indicates that the approximate tape running time is being displayed on the counter. Reference numeral (61) denotes a remaining (REMAINING) display portion, which indicates that the remaining time until the end of the tape is being displayed on the counter. (62) is a memory display unit, which indicates that the memory button stores 0m00s. (63) is a program time (PGM TIME) display portion, which indicates that the elapsed time of the current music is being displayed on the counter.

(64) is an emphasis (EMPHASIS) display section,
When playing a tape with emphasis applied, de-emphasis is automatically applied and the emphasis display lights up. The display also lights when recording a source with emphasis on DIGITAL IN. Lights when recording with LINE IN. (65) is a PGM (song number) display section, which displays the current song number when a program number is recorded. Reference numeral (66) denotes an AMS (track start) display section, which indicates, when the button (50) is depressed, how many songs, including the song currently being listened to, to go back or to go forward. When the number button (42) is pressed, the number (song number) is displayed while searching for a desired song.

Reference numeral (67) denotes a digital copy prohibition display section, which flashes when digital dubbing is performed, if there is a digital copy prohibition code. In this case, you cannot record. (68) is a caution (CAUTION) display unit. When water drops due to dew condensation while the deck is operating, this display flashes and the operation stops.

Reference numeral (69) denotes a search display section, which lights up when the button (50) is pressed or when a direct song selection is performed by designating a song number, or during a skip operation. Reference numeral (70) denotes a start ID display section, which blinks while the start ID signal is being recorded (for about 9 seconds) or during erasure, and lights up while the portion where the start ID signal is recorded is being reproduced. Reference numeral (71) denotes a skip ID display section, which is recording a skip ID signal (about 1 second) or erasing a skip ID signal.
Also, during playback, it lights up momentarily when it reaches the part where the skip ID signal is recorded.

(72) is a sampling frequency display section, which lights in accordance with the sampling frequency of the digital program source (32 kHz: DBS (direct satellite broadcasting), 44.1 kHz: recorded DAT soft tape, 48 kHz: DBS, DAT recording / reproduction Time). (73)
Is a peak level meter, which indicates the peak value of the signal level to be recorded during recording, and indicates the peak value of the recorded signal level during reproduction. (74) is a counter which displays the running time of the tape, the elapsed time of the current song, and the remaining time until the end of the tape. Each time the mode button (37) of the counter is pressed, the displayed content switches.

An indication of how the G ₄ display operation then program time with reference to Figure 4-Figure 6 will be described.

On a tape where no program time is recorded or only recorded during the start ID signal,
Program time display status, ie display (27)
"PGM TI" appears in the program time display section (63) (Fig. 3).
First, in the first embodiment, the program time display is changed to the high-speed search operation so that the tape movement can be recognized when the high-speed search operation is performed in a state where the content of the counter (74) indicates the program time. The counter is displayed only at the time. That is, the counter display section (60) (FIG. 3) of the display (27) is set to "COUNTER" and the content of the counter (74) is set to the tape running time. After the end of the high-speed search, the mode is returned to the program time display mode again.

FIG. 4 shows a flowchart of a first embodiment in which the mode is switched from the program time display mode to the counter display mode at the time of high-speed search, and FIG.
To enter the high-speed search mode. At step (b), the system controller (20) determines whether or not the program time is being displayed. If so, the display mode is switched to the counter display mode at step (c). Then, the program time flag is set in step (d), and the process returns in step (e).
If the program time is not being displayed in step (b), the process immediately proceeds to step (e) and returns.

Next, in FIG. 4B, when the high-speed search is completed in step (f), the presence or absence of a program time flag is determined by the system controller (20) in step (g). Return the display mode to the program time display mode. Then, the program time flag is reset in step (i), and the process returns in step (nu). If there is no program time flag in step (g), the process immediately proceeds to step (nu) and returns.

In the second embodiment, the display by the segment display element of the counter (74) for displaying the program time is a display (pattern) that indicates the tape running, and after the high-speed search is completed, the display is returned to the program time display again.

5 and 6 show display examples of the segment display element according to the second embodiment, and a normal program time is displayed as shown in FIG. 5A. At the time of the FF search, the display is performed as shown in FIG. 5B. In other words, the broken lines have been erased, and only the portions indicated by the solid lines are displayed. Thereby, the moving direction of the tape can be known. Fig. 5C during REW search
Display as shown. This allows the direction of tape movement
It turns out that it is opposite to the case of the FF search.

Although FIG. 5 described above is a case where the same pattern is continuously displayed during the high-speed search, the display portion may be rotated in the direction of the arrow as shown in FIG. This rotation timing is more effective when performed at the search speed.

In this manner, in the first embodiment, the movement of the tape can be well understood in both the direction and the speed because the counter is displayed during the high-speed search.

Further, in the second embodiment, the movement (direction) of the tape is known so as to be separately displayed at the time of high-speed search, and the search speed can be known by linking the rotation timing of the arrow with the search speed.

H Advantageous Effects of the Invention As described above, according to the present invention, the program time display mode is switched to the information display mode related to the rotation of the reels at the time of high-speed search. The program time which has not been recorded can be substantially displayed.

[Brief description of the drawings]

FIG. 1 is a circuit diagram showing one embodiment of the present invention, FIG. 2 is a perspective view showing the appearance of an R-DAT to which the present invention is applied, FIG. 3 is a diagram showing the display in detail, and FIG. 5 is a flowchart for explaining the operation of the present invention, FIGS. 5 and 6 are diagrams for explaining the operation of the present invention, FIG.
The figure shows an example of a tape format used for R-DAT, and FIG. 8 shows 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 a take-up reel, (20) is a 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 (2)

(57) [Claims] 1. A method for starting only at the time of reproduction using a magnetic tape on which a program time is not recorded at all or which is recorded only during a period in which a start ID signal is recorded.
In a recording / reproducing apparatus that interpolates the program time based on the program time within the period in which the ID signal or start ID signal is recorded, at the time of high-speed search, the display switches from the program time display to the counter display based on reel rotation detection. Recording / reproducing apparatus characterized by the above-mentioned. 2. The method according to claim 1, wherein the program time is not recorded at all, or is started only at the time of reproduction using a magnetic tape recorded only during a period in which a start ID signal is recorded.
In a recording / reproducing device that interpolates the program time based on the program time within the period in which the ID signal or start ID signal is recorded, the display of the program time is switched from a display of the program time to a display in which the tape running direction can be identified during high-speed search. Recording / reproducing apparatus characterized by the above-mentioned.