JP2782811B2 - Recording and playback device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a recording / reproducing apparatus for recording an information signal on a recording medium and reproducing the information signal recorded on the recording medium.

2. Description of the Related Art Conventionally, a still video conference has defined a format for recording a video signal for one field on each of 50 tracks formed concentrically on a magnetic disk. Used as an image recording medium for cameras.

In a conventional electronic still camera with a playback function,
Whenever you switch from record mode to playback mode,
The outermost track of the still video floppy was to be played.

[Problems to be Solved by the Invention] However, in such a configuration, after reproducing in the recording mode (that is, recording on a floppy), and then wishing to reproduce and observe a captured image, the recording mode is reproduced. Mode, and after the magnetic head is set on the first track, it is necessary to move the magnetic head to the immediately preceding track by operating the up switch and the down switch, and the operability is extremely poor.

Therefore, the present invention proposes a recording / reproducing apparatus capable of quickly reproducing an information signal recorded last on a recording medium and confirming the content when the operation mode of the apparatus shifts from a recording mode to a reproducing mode. The purpose is to do.

[Means for Solving the Problems] A recording / reproducing apparatus according to the present invention is an apparatus for recording an information signal on a recording medium and reproducing the information signal recorded on the recording medium. Recording or reproducing means for recording a signal or reproducing an information signal recorded on the recording medium, and storage means for storing information for specifying an information signal recorded on the recording medium, In response to the transition of the operation mode of the recording / reproducing means from the recording mode to the reproducing mode, the recording is performed such that the information signal last recorded on the recording medium is reproduced according to the information stored in the storage means. Control means for controlling the operation of the reproducing means.

[Operation] With the configuration described above, when the operation mode of the apparatus shifts from the recording mode to the reproduction mode, the information signal last recorded on the recording medium can be quickly reproduced and its contents can be confirmed.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention when applied to an electronic still camera. 10 is a magnetic disk having 50 tracks numbered from 1 to 50 in order from the outermost circumference, 12 is a magnetic head for recording and reproduction, 14 is a motor for rotating the magnetic disk 10, and 16 is the rotation speed of the motor 14. A servo circuit for controlling the magnetic head to a predetermined value; a head moving mechanism for moving the magnetic head in a radial direction of the magnetic disk to be positioned on a designated track; a step motor for providing a driving force for the head moving mechanism; Is an innermost detection switch that is turned on when the magnetic head 12 is located at the innermost track, and 24 is a disk detection switch that detects that the magnetic disk 10 is set.

26 is an imaging circuit that converts an optical image by an optical system 27 into an electric signal, 28 is a recording signal processing such as gamma correction and FM modulation performed on an output signal of the imaging circuit 26, and is suitable for recording on the magnetic disk 10. A recording signal processing circuit 30 for converting the signal into a signal is a recording amplifier. A switch 31 is connected to the contact a during reproduction and to the contact c during recording, and the contact b is not connected to any of the contacts a and c. 32 is a reproduction amplifier, 34 is a reproduction signal processing circuit that applies a reproduction signal processing such as FM demodulation to the output of the reproduction amplifier 32 and outputs a video signal, and 36 is a mute output of the reproduction signal processing circuit 34 according to an external control signal. Mute circuit. Reference numeral 38 denotes a detection circuit that detects the envelope of the output of the reproduction amplifier 32, and reference numeral 40 denotes a comparison circuit that compares the output voltage of the detection circuit 38 with a predetermined reference voltage.

Reference numeral denotes a main control circuit that controls the above-described units, and reference numeral denotes a memory (RAM) that stores variables and the like necessary for the main control circuit. Reference numeral 46 denotes a sub-control circuit that monitors a switch input described later, and performs bidirectional communication with the main control circuit 42 by handshaking. 48, 50, and 52 are mode setting switches for setting recording, playback, and lock modes, respectively.
54 is a switch for instructing the start of interval playback,
56 is a switch for instructing track down, 58 is a switch for instructing track up, 60 is a switch for instructing execution of the recording operation, and 62 is a switch for instructing preparation for the recording operation.

Note that the mode setting switches 48, 50, and 52
Only one is configured to turn on. When the switches 54, 56, and 58 change from off to on, the sub control circuit 46 transmits the fact to the main control circuit 42 only once.

Reference numeral 64 denotes a power supply, 66 denotes an OR circuit that opens and closes a switch 68 according to a control signal from the sub-control circuit 46 or the main control circuit 42, and 70 denotes a memory (RAM) that stores data necessary for the sub-control circuit 46. The sub-control circuit 64, the OR circuit 66 and the memory 70 are powered
Power is always supplied from the power supply 64, and power is supplied to the main control circuit 42 and other circuits via the switch 68. When the output of the OR circuit 66 is high (H), the switch 68
Is closed, and opened when low (L). Sub-control circuit
46, when the set of the magnetic disk 10 is detected in the state of the recording or reproduction mode, when the mode is switched from the recording mode to the reproduction mode or vice versa, when the reproduction mode is set by the mode setting switch 50, Alternatively, when the recording switch 60 or the recording preparation switch 62 is turned on in the storage mode, the signal 66b is set to high. Main control circuit 42
When power is supplied, first, the signal 66a is set high to perform communication with the sub-control circuit 46. During the communication, the sub-control circuit 46
Makes signal 66b high.

The operation of loading the magnetic disk 10 will be described with reference to FIG. The sub-control circuit 46 is always supplied with a power supply voltage from the power supply 64, and detects the set of the magnetic disk 10 by the disk detection switch 24. When the set of the magnetic disk 10 is detected, the sub control circuit 46 sets the mode setting switches 48, 50,
A check is made on 52, and if it is not locked, the switch 68 is closed via the OR circuit 66 so that the power supply voltage is supplied to the main control circuit 42 and other circuits.

When the power supply voltage is applied, the main control circuit 42
31 is connected to the contact "b", the mute circuit 36 is muted, and the signal 66a is set high. Next, the sub control circuit 46 transmits an initialization command to the main control circuit 42 (S1), and transmits recording or reproduction according to the state of the mode setting switches 48, 50, 52. Such an initialization command is
When 10 is newly set, or when the magnetic disk 10 is set and an initialization command is sent once,
This is transmitted when the power supply to the main control circuit 42 is interrupted once due to the replacement of the 64 or the like. The main control circuit 42 rotates the magnetic disk 10 via the servo circuit 16 and the motor 14, and moves the magnetic head 12 to the inner circumference side by one track until the innermost circumference detection switch 22 is turned on (S2, 3). Next, the track number 50 is set in the memory variable T of the RAM 44, the track table is initialized to "0" as shown in FIG. 3, and the switch 31 is connected to the contact a (S4). In the track table of this embodiment, 7 bytes at addresses a to g are used, and one bit is assigned to each track. This same table is RAM7 for backup
0 is also available.

The reproduction output of the magnetic head 12 is controlled by the switch 31 and the reproduction amplifier.
The signal is applied to a detection circuit 38 via 32 to perform envelope detection, and a comparison circuit 40 compares the detection output with a reference voltage level. Thus, the presence or absence of a recording signal can be determined. If there is a recording signal, the recording flag is set at the bit position of track T in the track table, and if there is no recording signal, the recording flag is reset (S5, 6, 7). Then, the main control circuit 42 transmits the information of the recorded flag of the track T to the sub control circuit 46, and the sub control circuit 46
0 is stored in the track table (S8).

If the track being accessed, that is, the track T has not been recorded (S9), and if the track has been recorded but is not in the recording mode (S10), each track is checked down by one track until the first track is reached (S11). It is checked whether it is (S12,5-10). When the track T has been recorded and is in the recording mode (S9, 10), when the track T is not the 50th track, the track is increased by one track (S13, 14), and when the track T is the 50th track, the magnetic head 12 is moved to that position (S13, 14). ), The main control circuit 42 transmits an initialization end command to the sub control circuit 16 (S15). The main control circuit 42 also operates in the recording mode (S
16), the signal 66a is set to low, and the switch 68 is closed (S1).
7) If not in the recording mode, the mute of the mute circuit 36 is released (S18).

By the above operation, when the magnetic disk 10 is set in the recording mode, it is checked whether or not recording has been performed in order from the innermost track to the outer circumference. The initialization is completed by positioning the head. If all the tracks are unrecorded, the initialization is completed on the first track, and if the innermost track (the 50th track) is already recorded, the initialization is completed on the 50th track.

When the magnetic disk is set in the reproduction mode, it is checked in order from the 50th track to the 1st track whether or not recording has been completed, and the initialization is completed at the 1st track.

The sub-control circuit 46 sets the track number T transmitted from the main control circuit 42 to T0 in the RAM 70 in S8, and stores the recorded flag in a corresponding portion of the track table.

After the end of the initialization in the recording mode, the switch 68 is turned off, the power supply to the main control circuit 42 and other circuits is cut off, and only the sub-control circuit 46 operates. Therefore, RA
The track table stored in M44 and the number T of the track being accessed are lost, but the same data is stored in the RAM 70.

The operation when the recording preparation switch 62 is turned on in the recording mode in a state where only the sub-control circuit 46 is operating after the initialization is completed will be described with reference to FIG. When the recording preparation switch 62 is turned on, the sub control circuit 46 sets the signal 66b to high and turns on the switch 68 so that power is supplied to the main control circuit 42. The main control circuit 42 sets the signal 66a high, holds the switch 68 on, and
And switch 31 is connected to contact b. The sub control circuit 46 transmits the mode information (recording) (S20), the current track number T0 (S21), and the information of the track table (S22) to the main control circuit 42. The main control circuit 42 sets the current track number T0 received from the sub control circuit 46 in the memory variable T (S23), and sets the variable T in the memory variable T1 (S24).

The main control circuit 42 refers to the bit contents of the track T1 in the track table and determines whether or not the data has been recorded ("1") (S25). If the track has been recorded, an unrecorded track is found in the track table (S25), or the variable T1 is incremented (S27) until the track reaches the 50th track (S26). If the track 50 is reached with only recorded tracks (S26), it is determined that there is no empty track, the sub-control circuit 46 is notified of that (S28), the signal 66a is set to low, and the switch 68 is turned off. (S35), and ends.

When the track T1 is not recorded in the track table, that is, when the bit content is “0” (S25), the track T1 confirmed to be not recorded and the current track T
(S29), and if they are not equal, the magnetic head 12 is tracked up, that is, T is incremented until it becomes equal (S30). If T1 and T are equal (S29), the recording switch 60 is checked (S31). If ON, the imaging circuit 26 is driven, the switch 31 is connected to the contact c, and the captured field video signal is (S33), the main control circuit 42 sets the corresponding bit of the track table to "1", and the sub-control circuit 46 stores the current track number T,
Information indicating that the track has been recorded is transmitted (S34). The sub control circuit 46 stores the received track number T in the RAM.
The fact that it has been recorded again as T2 is stored in 70. After that, the process returns to S24 to search for an empty track by the routine of S25 to S27.

If the recording switch 60 is not on (S31), if it is in the recording mode (S32), it waits for the recording switch 60 to be turned on. If it is not the recording mode (S32), the switch 68 is turned off (S35). finish.

FIG. 5 shows a detailed flowchart of the track-up control in S30. The current track is the innermost track.
In the case of 50 tracks (S40), return as it is
If the track is not a track (S40), the magnetic head 12 is moved to the inner circumference of one track (S41), and 1 is added to the variable T (S4).
2) Check whether or not the track T has been recorded by the track table, and store the information and the contents of the variable T in the sub control circuit.
It transmits to 46 (S43).

As described above, the video signal is recorded while searching for an empty track up to the 50th track. Sub-control circuit 46
, The track number T currently being accessed is stored as the track number T2 at which recording was last performed.

Next, the operation in the reproduction mode will be described with reference to FIG. For example, suppose that the mode has changed from the recording mode to the reproduction mode. The sub control circuit 46 turns on the switch 68 by setting the signal 66b to high, so that power is supplied to the main control circuit 42. The main control circuit 42 sets the signal 66a to high,
Is held in the ON state, the magnetic disk 10 is rotated, the switch 31 is connected to the contact b, and the mute circuit 36 is set in the mute state. The sub control circuit 46 sends the mode information (playback) (S50), the current track number T0 (S51), the track table information (S52), and the track number T2 (S5) to the main control circuit 42.
3) Send. The main control circuit 42 sets the current track number T0 received from the sub control circuit 46 in the memory variable T (S5
4) The current track number T is compared with the track number T2 (S55), and track up control or track down control is performed so that T = T2 (S56, 57, 58).

When the magnetic head 12 moves to the target track T2, the reproducing operation starts (S59). Specifically, the switch 31 is connected to the contact a, and the reproduction output of the magnetic head 12 is supplied to the reproduction signal processing circuit 34 via the switch 31 and the reproduction amplifier 32, and the reproduction signal processing circuit 34 performs reproduction processing such as demodulation. And a reproduced video signal is obtained. Then, when the main control circuit 42 releases the mute of the mute circuit 36 (S60), a reproduced video signal is output.

Thereafter, the main control circuit 42 knows the state of each switch by communicating with the sub control circuit 46, and during the playback mode (S65),
The corresponding operation is performed. That is, track up control is performed according to the up switch 58 (S61, 6).
7) Track down control is performed according to the down switch 50 (S62, 68).

When the reproduction mode switch 50 is turned off (S65), the main control circuit 42 sets the signal 66a to low and closes the switch 68 (S66), and the sub control circuit 46 stores the current track number T as T2 in the RAM 70. (T69). That is, S66 in the playback mode
Then, the variable holding the current track number in the RAM 70 and T2 have the same contents.

In the recording mode, as shown in FIG. 4, after recording is performed, the magnetic head is moved to the inner unrecorded track. Even if there are a number of recorded tracks on the inner peripheral side, they are moved so as to avoid such recorded tracks and detect unrecorded tracks. Therefore, when the mode is switched from the recording mode to the reproduction mode, the track on which the magnetic head is located is not the track on which recording was performed immediately before. In this embodiment, the number of the track on which recording was executed immediately before is stored as T2, and the magnetic head is moved to the track T2 in S55 to S58, so that the image recorded immediately before is reproduced first. Such an operation is the same even if there is a recorded track in the middle.

In the present embodiment, the lock mode is an operation mode in which various states of the recording mode or the reproduction mode before the lock mode is maintained are maintained, and the recording mode is changed to the lock mode.
The mode change from the mode to the playback mode
This is equivalent to a mode change called a reproduction mode.

FIG. 7 shows a detailed flowchart of the track down control (S58). If the current track T is the first track (S80), the process returns as it is; otherwise, the magnetic head 12 is moved by one track toward the outer periphery (S81), and 1 is subtracted from the variable T (S82). ), T is S51
It is checked whether or not it is equal to or greater than the received T0 (S83). If it is not equal to or greater than T0, T is set to a variable T0 (S84) and the switch 31 is set to a.
It is connected to a contact to perform RF detection and check whether or not recording has been performed (S85). By S84, the variable T0 always holds the minimum track number that has been reproduced since the start of reproduction.

When T is equal to or greater than T0 (S83) and after the RF detection (S85), the track number T and information as to whether or not the track has been recorded are transmitted to the sub-control circuit 46 (S86).

When switching from the reproduction mode to the recording mode, the sub-control circuit 46 may set the variable T2 of the RAM 70 to 1. In this way, when returning to the reproduction mode without performing any recording, the magnetic head 12 accesses the first track.

Although a magnetic disk is taken as an example of a recording medium, the present invention is not limited to this, and a solid-state memory device such as a magnetic tape, an optical disk, a magneto-optical disk, or a semiconductor memory may be used.

[Effects of the Invention] As can be easily understood from the above description, according to the present invention, when the operation mode of the apparatus shifts from the recording mode to the reproduction mode, the information signal recorded last on the recording medium is quickly converted. Since reproduction is performed, it is possible to present a recording / reproducing apparatus capable of quickly and easily confirming the content of the last recorded information signal.

[Brief description of the drawings]

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention, FIG. 2 is a flowchart of initialization, FIG. 3 is a memory layout of a track information table, FIG. 4 is a flowchart of a recording mode, and FIG. FIG. 6 is a flowchart of the reproduction mode, and FIG. 7 is a flowchart of the track down control. 42: Main control circuit, 44, 70: RAM, 46: Sub control circuit, 48, 50, 52:
Mode setting switch, 54: Interval playback start
Switch, 56: down switch, 58: up switch, 60: record switch, 62: record ready switch

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) G11B 27/10 G11B 27/36 H04N 5/781

Claims (1)

(57) [Claims] 1. An apparatus for recording an information signal on a recording medium and reproducing the information signal recorded on the recording medium, wherein the information signal is recorded on the recording medium or recorded on the recording medium. Recording / reproducing means for reproducing an information signal stored therein, storage means for storing information for specifying an information signal recorded on the recording medium, and an operation mode of the recording / reproducing means from a recording mode to a reproducing mode. Control means for controlling the operation of the recording / reproducing means so as to reproduce the information signal recorded last on the recording medium in accordance with the information stored in the storage means in response to the transition to Recording / reproducing apparatus characterized by the above-mentioned.