JPH03183052A - Data recorder - Google Patents

Abstract

PURPOSE:To record data without generating discontinuous points by instructing the reverse tape traveling direction at the time of detecting a silent section of a music interval on and after a tape residual amt. becomes a fixed value and downward. CONSTITUTION:An input sound data is delayed by a memory 107, and a record ing signal generated based on this delayed data is recorded on a magnetic tape of a cassette 101 via a recording and reproducing part 104, and at the same time, a level of the input sound data is detected, and then a no-sound flag fn for showing a no-sound part from a level deciding part 111 and a tape residual time T1 by a reel rotational frequency detecting part 109 and a residual amt. calculating part 110 are supplied to a system control part 105. Then, when the time T1 becomes a prescribed time or less, and when the flag fn is supplied, a tape travel reversing command is impressed on a mechanism control part 102 from the control part 105, and a data is recorded without generating discon tinuous points, so that the occurrence of a silent section or a discontinuous point in music is prevented during the time of reproducing.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a recording/reproducing apparatus using a recording medium having two types of running directions, such as a 5-DAT (fixed head digital audio recorder). In particular, the present invention relates to a recording/reproducing device having an auto-reverse function.

2. Description of the Related Art] An auto-reverse function is very important in fixed head type recording and reproducing apparatuses having two running directions, such as compact cassettes and 5-DATs.

Conventional fixed-head recording/playback devices, such as compact cassettes, can record in two directions by changing the running direction when the user presses a reversing switch, or reversing when a leader tape is detected at the end of the tape. It allows playback.

Regarding 5-DAT, please refer to pages 159 to 16 of the "Digital Audio Dictionary" published by the Japan Audio Association.
It is explained on page 6.

Problems to be Solved by the Invention However, the fixed head type recording and reproducing apparatus as described above has the following problems.

1. If you start reversing after detecting the leader tape, you will not be able to match the reversal timing with the song, so recording will be interrupted even in the middle of the song, and a silent section will occur during playback. or a discontinuity point may occur.

2. If the reversal is started after detecting the leader tape, the recording period of the lead-out area will be shortened. Or, the lead-out area cannot be recorded.

The present invention solves the above-mentioned conventional problems.The present invention reverses the running direction of the tape when a silent section between songs is detected after the remaining amount of tape falls below a certain value. It is an object of the present invention to provide a data recording device in which recording is interrupted in the middle of a song, and a silent section or discontinuous point does not occur during playback.

Note that whether or not the remaining amount of tape has fallen below a certain value can be determined by measuring the rotational frequency of the shaft that drives the cassette reel using the reel FG (
The winding diameter of the reel is calculated by measuring with a frequency generator), and the remaining time to the end of the tape is calculated based on the winding diameter of the reel.

Means for Solving the Problems The data recording device of the present invention includes: a memory for delaying input main data; a level determination section for outputting a silence flag based on the level of the input main data before the delay; A recording section that generates a recording signal based on delayed input main data, a reel rotation frequency detection section that detects a reel rotation frequency, and a remaining tape amount calculated from the reel rotation frequency output from the reel rotation frequency detection section. a tape end detection section that detects the end of the tape; a mechanism control section that controls the mechanism; and a system control section that instructs the operation mode of the mechanism control section and the recording section. The system control unit determines that the remaining capacity of the tape output by the remaining capacity calculation unit becomes T seconds or less, and
When the level determination section outputs a silence flag or when the tape end detection section outputs a tape end flag, it instructs the recording section to record a lead-out area and a continuous recording flag, and After the recording of the recording flag is completed, the level determining section instructs the silent flag.

Effect With the above-described configuration, the data recording device of the present invention reverses the running direction of the tape when detecting a silent section between songs after the remaining amount of tape becomes less than a certain value. It is possible to realize a data recording device in which recording is interrupted in the middle of a song, and a silent section or discontinuity point does not occur during playback.

Embodiments Hereinafter, embodiments of the data recording apparatus of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of a recording/reproducing device including a data recording device of the present invention.

In FIG. 1, 101 is a cassette storing a magnetic tape, 102 is a mechanism control unit that controls the running of the magnetic tape according to instructions from a system control unit 105, and 103
is a recording and reproducing head that performs recording and reproduction on magnetic tape.

In this embodiment, the magnetic tape is divided into two areas, upper and lower, one of which is used for recording in the forward direction and the other for recording in the reverse direction. To reverse the running direction, rotate the head 180 degrees.

104 adds an error correction code to the input audio data and auxiliary data used for travel control etc. given from the system control unit 105, modulates the modulated signal, and outputs it as a recording signal to the recording and reproducing head 103;
03, performs error correction, outputs output audio data, extracts auxiliary data, and sends it to the system control unit 105.

A system control unit 105 instructs the mechanism control unit 102 to select a running mode, and instructs the recording and reproducing unit 104 to select a recording mode, a reproducing mode, and the like. The system control unit 105 can be realized by a microprocessor or the like. 10
Reference numeral 6 denotes a recording/reproduction mode setting section for the user to give commands to the system control section. The user uses a recording/reproducing mode setting unit 108, which is composed of a switch or the like, to instruct a general operation mode such as recording, reproduction, or repeated reproduction.

In this embodiment, the input/output of the recording/reproducing device is audio data, but other data such as image data may be used, so auxiliary data used for control is generally referred to as main data.

107 is a memory for delaying input audio data. Memo 1J107 temporarily stores input audio data and outputs it with a delay of 3 seconds. A tape end detection unit 108 outputs a tape end flag ft to the system control unit 105 when the tape approaches its end and the leader tape portion is pulled out.

Detection of the leader tape is performed using the difference in light transmittance between the magnetic tape section and the leader tape section.

Reference numeral 109 denotes an rJ-le rotation frequency detection unit that detects the rotation frequency of the reel. To detect the rotation frequency of the reel,
A common method is to use a frequency generator (FG) as described below.

The rotation period of the reel is measured by shining light onto a striped pattern written on a reel stand fixed to the shaft that drives the cassette reel, and converting the reflected light into an electrical signal using a light receiving element. For example, when nine striped patterns are written on the reel stand and the frequency of the electrical signal output from the light receiving element is f, the rotational frequency f of the reel is expressed as in the following equation.

f,=f/P...(1)
Reference numeral 110 denotes a remaining amount calculating section that calculates the remaining tape amount using the reel rotation frequency f outputted by the reel rotation frequency detection section and outputs tape remaining amount information T'+ to the system control section 105.

FIG. 2 is a diagram showing the tape wrapped around the tnord.

In FIG. 2, r is the radius of the reel, R2 is the winding radius of the take-up reel, RI is the winding radius v of the supply reel, and Vt is the tape speed. Letting the thickness of the tape be H, the remaining tape expressed in tape length ffi L +
is expressed by the following formula.

L+=π(RI2r')/H" (2) Furthermore, when the winding radius of the supply reel is RI1 and the reel rotation frequency is fl, the tape speed Vt is expressed by the following equation.

Vt = 2 x RIf,
” (3) (2), From formula (3), L+= yr ((Vt'/ 4 w 2f r2)
r2)/H" (4) When the tape speed during recording and reproduction is V, the remaining tape amount T1 expressed in time is expressed by the following equation.

T 1 = L + / V t = π [(Vt/4π2f r2) - (r2/Vt))
/H.'' (5) Therefore, if the tape speed V, reel radius r, and tape thickness H are known, the remaining amount of tape can be calculated using the reel rotation frequency f.

If the thickness H of the tape is not known, the reel rotation frequency fr1 is measured while the tape is running, the thread rotation frequency fee is again measured on the Td paper machine, and the following two equations are established.

T+=ff((Vt/4π2fr+2)−(r2/Vt
))/H=・(6)T++Ta=π((Vt/4π2f
r22) (r2/Vt))/■...(7) From equations (6) and (7), the thickness H of the tape is expressed by the following equation.

H: πCVt/4π2)'[(1/f, 22)-(1/
f, +2))/Ta'...(8) 111 detects the level of input audio data, and outputs a silence flag fn to the system control unit 105 when the level remains below -60 db for 3 consecutive seconds. This is the level judgment section.

Next, the operation of the recording/reproducing apparatus according to the embodiment of the present invention will be explained.

A feature of the recording and reproducing apparatus according to the embodiment of the present invention is that when the user instructs double-sided continuous recording, for example, when recording continuously from side A to side B, there is no sound between songs as the end of side A approaches. When a section is detected, the running direction of the tape is reversed using this silent section, and a lead-out area ID indicating that recording has ended is recorded at the end point of recording on side A, and the continuation is recorded on side B. By recording a continuous recording flag indicating that the recording is being performed, the recording end point is detected during reproduction, and the recording end point is immediately reversed so that side B can be reproduced.

FIG. 3 is a control data layout diagram showing the recording result of control data on a tape recorded by the recording/reproducing apparatus according to the embodiment of the present invention.

In FIG. 3, a lead-in area is recorded for a certain period of time from the beginning of side A, then a program area for recording audio data is formed, and then a lead-out area is formed.

Note that the continuous recording flag CF in the lead-out area is set to 1. Immediately after recording the lead-out area, the running direction is reversed and the lead-in area is recorded on side B, followed by the program area and then the lead-out area.

The lead-in area is provided as a preliminary period from when the tape starts running until the running becomes stable, and a lead-in area ID=1 is recorded. The program area is an area where audio data is recorded, and the lead-out area is an area that indicates the end point of recording, and is recorded for a period long enough to be read even during a high-speed search. Lead-in area ID (LIID) and lead-out area ID (LOI) in the lead-in area, program area, and lead-out area
The relationship D) is as follows.

Lead-in Eli 7: LIID:1. LOID=0
Program area 7: LIID:0. LOID=O
IJ-P 7 c) E IJ 7: LIID=0.
LOID: During playback of 1, the recording end point is detected from the lead-out area during playback of side A, and when the continuous recording flag CF = 1, which indicates that side B is continuously recorded, it is immediately reversed and the If the continuous recording flag CF = 0 and the user has instructed double-sided playback, the recording end point is detected and immediately forwarded to the end of side A, reversed, and then side B is played back. , and if the user has instructed single-sided playback, the A
Make sure to rewind towards the beginning of the surface.

FIG. 4 is a flowchart showing the recording operation of the system control unit 105 of the recording/reproducing apparatus according to the embodiment of the present invention.

In FIG. 4, reference numeral 501 indicates the process of recording four frames of the red-in area from the beginning of side A.

Note that a frame represents the smallest unit that can be recorded independently on a tape.

502 indicates processing for recording one frame of audio data.

Step 503 branches to process 506 when the tape end flag ft supplied from the tape end detection unit 108 is valid, and branches to process 506 when the tape end flag ft is invalid.
4 shows the branching process.

Process 504 executes process 505 when the tape remaining amount information TI supplied from the remaining amount calculation unit 110 is less than 5 minutes;
A process of executing process 502 when tape remaining amount information T+ is 5 minutes or more is shown.

A process 505 indicates a process in which a process 506 is executed when the silence flag fn supplied from the level determination unit 111 is valid, and a process 502 is executed when the silence flag fn is invalid.

50E3 indicates processing for recording four frames in the lead-out area with continuous recording flag CF=1, lead-out area ID, and LOID=1.

507 indicates processing for instructing the mechanism control unit 102 to reverse the running direction of the tape.

To summarize processes 502 to 507, when the tape end flag ft is valid, or the remaining tape amount information T is less than 5 minutes, and the silence flag fn is valid, the process branches to process 506, enters the reversal process, If not, the audio data recording process in process 502 is continued.

508 indicates processing for recording four frames in the lead-in area.

Note that the time required for processing 506, processing 507, and processing 508 is 2 seconds.

509 indicates processing for recording one frame of audio data.

Step 510 branches to process 511 when an instruction to end recording is received from the recording/reproduction mode setting section 106, and processing 50 when an instruction to end recording is not received from the recording/reproduction mode setting section 106.
9 shows the branching process.

Reference numeral 511 indicates a process of recording four frames in the lead-out area with the continuous recording flag CF=O and ending the recording.

By the procedure described above, a tape as shown in FIG. 3 is created.

Furthermore, processing 506. Processing 507. The time required for processing 508 is 2 seconds, the delay of the input audio data by the memory 107 is 3 seconds, and the silent period detected by the level determination section is 3 seconds, so the delayed input audio data output from the memory 107 is: After the silent flag fn is set, there is a silent period of 3 seconds.

Processing 506. Processing 507. Since the process 508 can be completed, the input audio data can be recorded without any loss.

FIG. 5 is a flowchart showing a procedure for reproducing a tape created using the recording/reproducing apparatus according to the embodiment of the present invention. This process is performed by the system control unit 105.
It will be held in There are two methods of playback control: a method of playing back only once a range designated by the user, for example, both sides or one side, and a method of playing back repeatedly.Here, the case of repeating playback will be explained.

In FIG. 5, 600 indicates a process for instructing the mechanism control unit 102 to start the playback mode.

Reference numeral 601 indicates a process in which the process branches to process 604 if the frame currently being reproduced is in the lead-in area, and branches to process 602 if the frame currently being reproduced is not in the lead-in area.

602 indicates processing that branches to process 803 if the frame currently being reproduced is a program area, and branches to process 605 if the frame currently being reproduced is not a program area. That is, in processes 601 and 602, if the frame currently being played is the lead-in area, the process branches to process 604, and if the frame currently being played is the program area, the process branches to process 603, where the currently playing frame is the lead-in area. If the frame is the lead-out area,
The process branches to process 805.

803 indicates processing for reproducing and outputting one frame of audio data, and 604 indicates processing for muting audio output and continuing tape running.

Step 605 branches to process 606 when the user instructs repeat playback of both sides via the recording/playback mode setting unit 106, and branches to process 610 when the user instructs repeat playback of one side via the recording/playback mode setting unit 106. This is the process of

Step 606 branches to process 607 when the continuous recording flag CF=1 in the lead-out area, and the continuous recording flag C
The process branches to process 608 when F=O.

607 indicates processing for instructing the mechanism control unit to reverse the tape running direction.

Reference numeral 608 indicates processing for issuing an instruction to the mechanism control unit 102 to fast-forward the tape.

609 indicates processing that branches to process 607 when information that the end of the tape has been reached is received from the mechanism control unit 102, and repeats the same process once again when information that the end of the tape has been reached is not received from the mechanism control unit 102. .

The process of issuing an instruction to the 61Cl mechanism control unit 102 to rewind the tape is shown.

According to the procedure explained above, when the user specifies double-sided repeat playback, if the continuous recording flag CF = 1, the image will be immediately reversed in the lead-out area, and if the continuous recording flag CF = 0, it will be fast-forwarded in the lead-out area. When the user specifies single-sided repeat playback, rewinding begins in the lead-out area, and when the tape reaches the beginning, it is reversed and playback begins.

The tape recorded by the recording and reproducing apparatus according to the embodiment of the present invention is
Since the running direction is reversed from side A to side 8 during recording by using the silent section between songs, the sound will not be interrupted when the user specifies double-sided repeat playback.

DETAILED DESCRIPTION OF THE INVENTION As described in detail, the data recording device of the present invention includes a memory that delays input main data, a level determination unit that outputs a silence flag based on the level of input main data before the delay, and a memory that delays input main data. a recording section that generates a recording signal based on input main data, a reel rotation frequency detection section that detects the reel rotation frequency, and a residual amount that calculates the remaining amount of tape from the reel rotation frequency output from the reel rotation frequency detection section. The system control unit includes a quantity calculation unit, a tape end detection unit that detects the end of the tape, a mechanism control unit that controls the mechanism, and a system control unit that instructs the operation mode of the mechanism control unit and the recording unit. When the remaining amount of tape output by the remaining amount calculation section becomes T seconds or less and the level judgment section outputs a silence flag, or when the tape end detection section outputs a tape end flag, a lead-out area is displayed in the recording section. By instructing recording of the continuous recording flag and having the level determination section instruct the silent flag after the recording of the lead-out area and the continuous recording flag is completed, it is possible to detect when the remaining amount of tape is below a certain value during recording. onwards,
Since the running direction of the tape can be reversed when a silent section between songs is detected, recording will not be interrupted in the middle of a song. Therefore, during playback, no silent sections or discontinuous points occur in the song.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the configuration of a recording and reproducing device including the data recording device of the present invention, FIG. 2 is a diagram showing a tape wound around a reel, and FIG. 3 is a block diagram showing the configuration of a recording and reproducing device including a data recording device of the present invention. FIG. 4 is a flowchart showing the operation of the system control unit of the recording and reproducing apparatus according to the embodiment of the present invention during recording, and FIG. 2 is a flowchart showing a procedure for playing back a tape created using the recording/playing device according to an embodiment of the invention. 101... Cassette, 102... Mechanism control unit, 103... Recording and reproducing head, 104
...recording and reproducing section, 105...system control section,
108... Recording/playback mode setting section, 107...
Memory, 108... Tape end detection section, 109
. . . Reel rotation frequency detection section, 110 . . . Remaining amount calculation section, 1. . . Level judgment section.

Claims (3)

[Claims] (1) A memory that delays input main data, a level determination unit that outputs a silence flag based on the level of the input main data before the delay, and a recording signal based on the input main data delayed by the memory. a recording section that generates a reel rotation frequency, a reel rotation frequency detection section that detects a reel rotation frequency, a remaining amount calculation section that calculates a remaining tape amount from the reel rotation frequency output from the reel rotation frequency detection section, and a mechanism that controls the mechanism. a control unit; and a system control unit that instructs the operation mode of the mechanism control unit and the recording unit, and the system control unit is configured to operate when the remaining tape output from the remaining capacity calculation unit becomes T seconds or less, and . A data recording device, wherein when the level determination section outputs a silent flag, the mechanism control section is instructed to reverse the traveling direction. (2) When the remaining amount of tape outputted by the remaining amount calculating section becomes T seconds or less and the level determining section outputs a silence flag, the system control section causes the recording section to continue with the lead-out area. 2. The data recording device according to claim 1, further comprising instructing recording of a recording flag, and instructing the mechanism control unit to reverse the traveling direction after recording of the lead-out area and continuous recording flag is completed. (3) A tape end detection unit that detects the end of the tape, and the system control unit detects when the remaining tape output from the remaining amount calculation unit becomes T seconds or less, and when the level determination unit detects a silence flag. or when the tape end detection section outputs a tape end flag, instructing the recording section to record a lead-out area and a continuous recording flag;
2. The data recording device according to claim 1, further comprising: instructing the mechanism control unit to reverse the traveling direction after the recording of the lead-out area and continuous recording flag is completed.