JP2744232B2 - Recording device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording apparatus, and more particularly to a recording apparatus that records a video signal on a recording medium. <Prior Art> A conventional recording apparatus for recording a video signal on a recording medium, for example, a recording apparatus capable of recording a video signal for one field on a concentric track formed on a magnetic sheet called a video floppy has been developed. Is underway. On such a magnetic sheet, for example, audio information of about 20 seconds can be time-axis-compressed, FM-modulated and recorded on the track. <Problems to be Solved by the Invention> However, in such a recording apparatus, only one of a video signal for one field and an audio signal for a predetermined time can be recorded in one track. If the video signal and the audio signal are to be reproduced at the same time, the video signal is reproduced while the audio signal is written in the memory and then expanded in the time axis and reproduced. Also, an after-recording function of recording an audio signal later on a video signal already recorded on a recording medium has a large effect on usability. However, if a video signal is recorded on the entire recording capacity of the recording medium, there is a problem that the audio signal may not be able to be after-recorded later. Such a problem is not limited to a recording medium such as a magnetic sheet.
A similar problem arises in a recording apparatus capable of selectively recording either an audio signal or a video signal in a plurality of recording areas (blocks). An object of the present invention is to solve such a problem. <Means for Solving the Problems> In order to solve the above-mentioned problems, the present invention provides a recording means (corresponding to the head 2 in FIG. 1 in the embodiment) for recording an image signal and an audio signal on a recording medium, When an image signal is recorded on a recording medium in units of screens, first setting means (after recording mode setting switch 43 also shown in FIG. 1) for setting after-recording of an audio signal having a predetermined length corresponding to the image signal. Second setting means (same as dial 39) for setting parameters related to the ratio of the number of screen units and the audio signal of the predetermined length, and the parameters set by the second setting means and recorded by the recording means. Control means for controlling the recording means so as to secure a predetermined recording capacity on the recording medium in accordance with the screen to be displayed (also a system control for executing the flowchart of FIG. 5). Having a roller 5) and. <Example> Next, the configuration of an example of the present invention will be described with reference to FIG. In the embodiment described below, an apparatus for recording and reproducing still image information and audio information on a magnetic disk is disclosed. However, the present invention is not limited to this, and a recording medium such as an optical disk may be used. Further, the medium is not limited to a disk shape, but may be a card shape, or may not have a track shape. FIG. 1 is a block diagram of a recording apparatus according to an embodiment of the present invention. In FIG. 1, a magnetic sheet 1 as a recording medium is
A video track Tr _V as a recording area and an audio track Tr _A corresponding to this track can be set freely. Numeral 2 is a magnetic head for recording and reproducing on and from the audio track Tr _A and video track Tr _V. 3 is a pulse motor for moving the magnetic head 2 in the radial direction. 4 is a motor control for controlling the driving of the pulse motor 3. A circuit 5 is a system controller for controlling the motor control circuit and a circuit described later. Reference numeral 6 denotes a switch for selectively connecting the magnetic head 2 to the output of the recording system A and the input of the reproducing system B. The terminal 6a of the switch 6 receives the output of the recording system A, and the terminal 6b. The input of the reproduction system B is connected. In this recording system A, 7 is a camera for converting an incident optical image into an electric signal, 8 is a microphone for transmitting an audio signal, and 9 is a PCM for converting an audio signal from the microphone 8 to a PCM.
PCM modulation circuit for modulating, 10 is a memory for storing the audio signal from the PCM modulation circuit 9, 11 is a time axis compression circuit for reading out the audio signal stored in the memory 10 at a high speed for time axis compression, and 12 is A switch for selectively connecting the output of the camera 7 and the output of the time axis compression circuit 11 to the FM modulation circuit 13. The terminal 12a of the switch 12 is provided with the camera 7 and the terminal 12b.
Is connected to a time axis compression circuit 11. Reference numeral 15 denotes a DPSK modulation circuit that performs DPSK modulation on a data signal described later output from the system control 5, 16 denotes a band-pass filter (BPF) connected downstream of the DPSK modulation circuit 15, and 17 denotes a BPF 16.
A frequency multiplexer for frequency-multiplexing the data signal transmitted from the multiplexing unit and the audio and video signals transmitted from the FM modulation circuit 13 via the gate circuit 14, and a recording amplifier 18 for amplifying the output from the frequency multiplexer 17. It is. In the reproduction system B, reference numeral 19 denotes a reproduction amplifier for amplifying the reproduction signal via the switch 6, reference numeral 20 denotes a band-pass filter (BPF) connected downstream of the amplifier 19, and reference numeral 21 denotes a data signal transmitted from the BPF In the DPSK demodulation circuit for demodulation, the data signal subjected to the DPSK demodulation is input to the system controller 5. Reference numeral 23 denotes an FM that performs FM demodulation of a video signal input through the reproduction amplifier 19 and the gate circuit 22.
The demodulation circuit 24 is a switch for selectively switching the connection between the output side of the FM demodulation circuit 23 and the monitor 25 and the time base expansion circuit 26 at the subsequent stage.The terminal 24a of the switch 24 is connected to the monitor 25. The connection switch 27 is connected to the terminal 24b, and the time base expansion circuit 26 is connected to the terminal 24b. Time axis expansion circuit
26 includes a memory 28 for storing audio signals, and performs time-axis expansion by lowering the speed of reading audio signals from the memory 28 with respect to the speed of writing audio signals to the memory 28. 29 is a PCM demodulation circuit for performing PCM demodulation of the audio signal read from the memory 28, and 30 is a switch connected to the PCM demodulation circuit 29.
Speakers connected via 31. 32 is the memory 28
And a timing pulse generator for transmitting a timing pulse for reading an audio signal from the system controller 5. When a start pulse is input from the system controller 5, the timing pulse is transmitted. Further, the system controller 5 discriminates the data signal from the DPSK demodulator 21 and generates a start pulse when an audio signal is recorded, and reproduces the audio signal. The system controller 5 has a recording / playback mode setting switch 41 which is turned on when setting the recording mode and turned off when setting the playback mode, and which is set to one of the audio recording mode and the video recording mode. A setting switch 42 for setting any one of a normal recording mode and an after-recording (after-recording) mode, a recording execution switch 44 for determining a recording trigger timing, and a track for accessing the head 2. UP switch 45 for shifting one track inward, DOWN switch 46 for shifting one track to the outer circumference, and continuous recording mode in which the head 2 is moved and recording is performed continuously while the recording execution switch 44 is ON. Or, even after the recording execution switch 44 is turned on, after recording is executed on the track accessed by the head 2 Thereafter, a single / continuous setting switch 47 for setting a single recording mode in which recording is not performed until the recording execution switch is once turned off and then turned on again is continued. 35 is a sheet presence / absence detection circuit that detects the presence / absence of a magnetic sheet from the outputs of the photocouplers 35A and 35B,
36 is an envelope detection circuit for detecting the output of the reproduction amplifier to determine whether the track accessed by the head 2 is recorded or unrecorded, and 37 is an empty track according to the output of the system controller 5. A display unit 39 for displaying a warning when there is no display, and a setting dial 39 described later in FIG. FIG. 2 shows an example of a recording format of a data signal which is frequency-multiplexed with a video or audio signal by the frequency multiplexer 17. In the figure, "a" records a 1-bit start bit of "1" or "0". In b, the video signal is 1
A 2-bit signal indicating whether recording is performed in units of fields or in units of one frame is recorded. In c, a 6-bit signal representing the number of the track to be recorded is recorded. In d, a 19-bit signal indicating the date is recorded. In e, a 1-bit signal indicating whether the signal recorded on the track is a video signal or an audio signal is recorded. Here, it is assumed that “0” is recorded when the signal to be recorded is a video signal and “1” is recorded when the signal is an audio signal. In f, a signal indicating whether or not there is an after-track or a video signal corresponding to a video or audio signal recorded in this track is recorded. Here, "0" is recorded when there is a corresponding post-track or audio signal, and "1" is recorded when there is no corresponding post-track or audio signal. In g, when "0" is recorded in f, a 6-bit signal representing a corresponding post-recording track or a track number in which a video signal is recorded is recorded. Next, the operation of the embodiment configured as described above will be described in the third.
This will be described with reference to the flowcharts shown in FIGS. First, when a power switch (not shown) is turned on, it is first determined from the output of the sheet presence / absence detection circuit 35 whether or not the magnetic sheet 1 is present (# 1). If there is, each track on the sheet 1 is recorded. Initialization is performed to determine whether recording has been completed or not (# 3). That is, the switch 6 is switched to the 6b side, the head 2 is sequentially moved from the track at the innermost or outermost end of the sheet 1 to the track at the opposite end, and the presence or absence of recording of each track is determined by an envelope detection circuit 36. , And stores it in the track memory in the system control. Next, when the recording mode is set by the recording / reproduction mode setting switch 41, the flow branches to # 7, and when the reproduction mode is set, the flow branches to # 6 (# 5). If the recording mode is set, it is determined from the information in the track memory stored in the above-mentioned initialization (# 3) whether or not there is an empty track on the magnetic sheet.
If not, a warning is displayed on the display unit 37 (部
8) If there is, the head 2 is moved to the outermost empty track (# 9). Next, the switch 6 is switched to the 6a side (# 11), and when the video recording mode is set by the setting switch 42, the switch 12 is switched to the 12a side (# 1).
Five). On the other hand, when the video recording mode is not set, the switch 12 is switched to the side 12b (# 14), and the flow proceeds as shown in FIG. When the video recording mode is set, it is determined whether or not the after-recording mode setting switch 43 is on. In the after-recording mode, the flow shown in FIG. The recording counter is reset (# 19), and the flow proceeds as shown in FIG. Next, the operation of the system controller 5 when not in the after-recording mode will be described with reference to FIG. In such a case, it is determined whether or not the recording execution switch 44 has been turned on.
14 is opened and, for example, a video signal for one field is recorded in a track on the magnetic sheet 1 (# 25), and then it is determined whether or not there is an empty track (# 20). Branching to 8 issues a warning. If there is, the head 2 is shifted to the next outermost track (# 27). Next, it is determined whether or not the single recording mode is set based on the state of the switch 47 (# 29). If the single recording mode is set, wait until the recording execution switch 44 is turned off. Returning to FIG. If the continuous recording mode is set, wait for the set time for the continuous recording interval (♯30).
Returning to # 23, if the recording execution switch 44 is on, recording is performed again, and if the recording execution switch 44 is turned off, the flow returns to. Next, the operation of the system controller 5 when the after-recording mode is set will be described with reference to FIG. The description of the same steps as those shown in FIG. 4 will be omitted. Steps # 23, 24, 26, 27, 29, 30, 31 in FIG. 4 correspond to steps # 41, 43, 44, 45, 50, 56, 57 in FIG. 5, respectively. When the post-recording mode is set, it is first determined whether or not the recording execution switch is turned on (# 41). When the recording execution switch is turned on, recording is performed (# 43).
Is moved to the next empty track (# 45), and the recording counter in the system controller 5 is incremented. In this case, the recording counter sets the empty track by shifting the head by one track for post-recording after recording the video signal for 5 tracks as in this embodiment, for example, during recording. It is provided in the system controller 5. Next, the content of the recording counter is "5"
Is determined (# 49). If it is "5", the track number accessed by the head 2 is stored in the post-record register (# 51). Next, it is determined whether or not there is an empty track (# 52). If there is, the head 2 is moved to the outermost empty track (# 53), and the content of the recording counter is reset to "0"(# 53). ). The post-recording register is a register which is read out in the order of inputting data in the same manner as the stack pointer. If there is no empty track, jump to FIG. 3 No. 8 to give a warning. ♯50, ♯5
7 is the same as # 29 and # 31, and the description is omitted. Even when an empty track is provided, the system controller 5 writes information indicating that recording has been completed in a bit corresponding to the empty track in the aforementioned track memory.
This prevents another video signal from being recorded in such an empty track. The recording counter is reset at # 55,
Alternatively, set the recording of the video signal without setting the after-recording mode and retain the contents until reset in # 19, so once set the after-recording mode as the recording mode and then set it to the playback mode. After that, the dubbing mode is set as the recording mode. That is, even if the after-recording mode is interrupted, an empty track of one track is automatically provided for every five tracks, and there is an effect that the voice input can be easily performed later. Next, the operation of the system controller 5 when the audio recording mode is set by the setting switch 42 will be described with reference to FIG. In this case, it is determined whether or not the recording execution switch 44 is on (# 61). If it is off, the process proceeds to step S. If it is on, writing of the audio signal to the memory 10 is started. Here, the memory 10 is configured by a shift register, and can write voice information for, for example, about 10 seconds. When audio information for 10 seconds or more is written, the memory 10 stores the latest audio signal for 10 seconds. Next, it is determined whether or not the after-recording mode is set (# 65). In the after-recording mode, it is determined whether or not the after-recording track already exists on the magnetic sheet and whether or not there is data in the after-recording register. (# 67), if there is data in the post-recording register, the data is read out (# 69), and the head 2 is moved to a track corresponding to the data, that is, a post-recording track (# 71). When the recording execution switch 44 is turned on and the writing of the audio signal to the memory 10 is started and then the recording execution switch 44 is turned on again (# 66), the audio signal stored in the memory 10 is read out and FM modulation is performed. The signal modulated by the circuit 13 is recorded on the magnetic sheet 1 by the head 2 (# 73), and the flow returns. Therefore, according to the embodiment shown in FIG. 6, when the audio recording mode is set while the audio dubbing mode is set, the head 2 automatically moves to the audio dubbing track, and the audio signal is transmitted to the audio dubbing track. Be recorded. According to the present embodiment, the recording execution switch, which is a trigger switch for video recording, is started when the audio signal is output,
Since it is used as a switch for setting the end, it is not necessary to separately provide operating members. Next, the operation of the system controller 5 when the reproduction mode is set by the switch 41 will be described with reference to FIG. In such a case, if the operation of the UP switches 45 and 46 is performed, the head 2 is moved to the inner circumference side or the outer circumference side of one track (# 81 to # 84). Next, the output of the DPSK demodulation circuit 21 is fetched (# 85), and it is determined whether or not the data has been recorded. If the data has been recorded, the bit indicated by e in the data signal shown in FIG. It is determined whether or not the signal is a recorded track (# 87). If it is a video track, the bit indicated by f of the data signal is detected to determine whether or not there is a track in which the corresponding audio signal is recorded. The discrimination is made (# 88), and if there is, the head 2 is moved to the corresponding track (# 90), the switch 24 is switched to the b side (# 92), and the reproduced voice information is written into the memory 28 (# 94). ). Then the written voice information is stored in memory
The data is read out at a low speed from 28, time-base conversion is performed, and the sound demodulated by the PCM demodulation circuit 29 is started to be reproduced by the speaker (# 96). Next, return head 2 to the corresponding video track (♯9
8) The switch 24 is switched to the a side to reproduce the video signal on the monitor 25 (# 100). Therefore, the corresponding audio signal and video signal are reproduced simultaneously. When it is determined at # 87 that the image is not a video track, the switch 24 is switched to the b side (# 101), and then an audio signal is written into the memory 28 (# 102). When the writing is completed, a timing pulse is generated. The start signal is sent to the device 32, the reading of the signal written in the memory 28 is started (# 103), the audio signal is reproduced from the speaker, and when the reading is completed (# 105), the flow returns to (# 105). . Therefore, according to the above embodiment, the corresponding video signal and audio signal are reproduced simultaneously. In the above-described embodiment, the time during which voice input is possible during after-recording is uniquely determined by the number of after-recording tracks. Next, the number of tracks for recording video signals for one after-recording track is made variable. An embodiment will be described in which the post-recording time per track in which a video signal is recorded can be set. In this embodiment, a dial 39 indicated by a broken line is provided in FIG. 1, and the flow shown in FIG. 7 is changed as shown in FIG. In FIG. 8, steps indicated by # 58, # 59, and # 60 are added. First, in step # 58, the value set by the dial 39 is fetched. Next, at # 59, it is determined whether or not the content of the recording counter is smaller than N. If it is smaller than N, the value of the recording counter is preset to N at # 60, and if it is larger than N, it is not changed at # 60. The flow proceeds to 41. Here, N is the value set on dial 39.
In the case of 1,2,3,4,5, the values are 4,3,2,1,0, respectively. The input of the dial 39 may depend on the code version, or a variable resistance whose resistance changes with the rotation of the dial may be detected. According to this embodiment, the number of tracks of the video signal with respect to the after-recording track can be made variable, and the usability of the after-recording can be improved. In the present embodiment, the post-recording track is set in the post-recording mode even in the single recording mode or in the continuous recording mode. By providing a step for resetting the recording counter, it is possible to prevent the after-recording track from being set in the continuous recording mode even in the after-recording mode. That is, when the magnetic sheet recorded in the continuous recording mode is to be reproduced at the same speed as that at the time of recording, when the after-recording track is provided, the interval of the continuous reproduction when the head 2 accesses on the after-recording track. However, if the step for resetting the recording counter is provided between # 50 and # 41 as described above, the above-mentioned disadvantage can be solved. In the embodiment described above, the after-recording track for recording the audio signal is provided for each predetermined number of tracks on which the video signal is recorded. However, the present invention is not limited to this, and the data relating to the video signal other than the audio signal is recorded. Tracks may be provided for each predetermined number of tracks on which video signals are recorded. The present invention is, of course, not limited to the type and shape of the medium. According to the present invention, when after-recording is set as described above, a parameter corresponding to the amount of the audio signal corresponding to the screen can be set, so that the audio signal of a desired length can be set. The after-recording can be freely performed, and the recording means is controlled so as to secure a recording area on the recording medium according to the parameters and the number of screens, so that the storage capacity is securely left on the medium for the desired after-recording. It is possible to perform desired after-recording without fail.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an embodiment of the present invention, and FIG. 2 is an example of a recording format of a data signal frequency-multiplexed with a video or audio signal by a frequency multiplexer 17. FIGS. 3 to 8 are flowcharts showing the operation of the system controller 5 shown in FIG. 1 magnetic sheet 2 head 3 pulse motor 10 memory 21 DPSK demodulation circuit

Claims (1)

(57) [Claims] Recording means for recording an image signal and an audio signal on a recording medium; first setting for setting after-recording of an audio signal of a predetermined length corresponding to the image signal when recording the image signal on the recording medium in screen units Means, a second setting means for setting a parameter relating to the ratio of the screen unit number and the audio signal of the predetermined length, a predetermined setting according to the parameter set by the second setting means and the screen recorded by the recording means Control means for controlling the recording means so as to secure a recording capacity on the recording medium.