JPH07240087A - Partially erasable recording device - Google Patents

Abstract

PURPOSE:To perform appropriate and good editing by generating a recording signal from measured data held by a measuring means by a recording signal generating means and recording the recorded signal in an erasing section. CONSTITUTION:A measuring means 4 holds a reproduced signal of a measured section set by a measuring section setting means as measured data. And a recording signal generating means generates a recording signal from measured data held by the measuring means 4, and records the recording signal in an erasing section. Thereby, since the recording signal is recorded in the erasing section, a difference between a erased part and not erased part is made small compared with simple erasing.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording device capable of erasing a part of a medium on which a signal is recorded in advance, and more particularly to a partially erasable recording device which is useful when audio or image is edited.

[0002]

2. Description of the Related Art A recording device is used to record an audio signal or an image signal on a medium. The recording device uses a magnetic tape, an optical disk, a magnetic disk, or the like as a medium for recording a signal. The signal recorded by the recording device may have an unnecessary signal portion as it is or may have a necessary signal lacking portion. Therefore, the program is incomplete. In order to broadcast a signal recorded on a medium or sell the signal recorded on the medium, it is necessary to edit the signal in advance according to the purpose of use.

Editing involves various kinds of operations such as adding a new signal, deleting a recorded signal, partially replacing it, and correcting the signal itself. Several devices suitable for editing signals have been known in the past. For example, Japanese Patent Laid-Open No. 62-177779 (G11B27).
/ 02). The device described here is a device suitable for performing an edit for moving a signal recorded at a position on one magnetic tape to another position. The device described here has a memory for storing a reproduction signal of an arbitrary section on the magnetic tape. In order to edit the magnetic tape, first, the reproduction signal of the section to be moved is recorded in the memory. Next, the reproduction signal recorded in the memory is recorded in another position. According to this device, a signal at a specific position on the magnetic tape can be freely moved to another position in one device.

In addition, JP-A-1-220285 (G11B)
27/08) is a device that uses two magnetic tapes, and is a device suitable for editing that records a signal of an arbitrary portion of the second magnetic tape on the first magnetic tape. . The device described here comprises a first memory for recording signals near the editing position of a first magnetic tape, and a second memory.
A second memory is provided for recording signals near the editing position of the magnetic tape. In this apparatus, the first magnetic tape signal is recorded on the first magnetic tape before the signal is actually recorded on the first magnetic tape.
Using the signals recorded in the second memory and the second memory,
You can check the editing status.

In addition to the typical edit forms described in the above two documents, partial erasure is an important edit form. Partial erasing is the editing of erasing a part of the signal recorded on the medium. The partial erasure editing is, for example, erasing noise on the medium for a short time of about 0.1 seconds or erasing an unnecessary signal for several seconds. In order to perform partial erasing with a conventional recording device, first, an erasing section in which partial erasing is performed is determined. Next, the recording device is set to the recording mode in the erase section. At this time, the recording signal is zero. Then, a signal zero is recorded in the erase section, and as a result, partial erase is possible.

[0006]

In the conventional recording apparatus, there was a problem when partial erasing was performed. The disadvantage is
It is inconvenient that new noise is generated at the boundary between the part that is not erased and the part that is erased. Also, when the medium is continuously played, the noise level differs between the part that is not erased and the part that is erased, and it feels unnatural. That is inconvenient.

The cause of this is that the noise is different between the non-erased portion and the erased portion. Generally, when a signal is recorded on a medium, some noise is recorded even in a non-signal portion. This noise is often at a very low level, but if amplified, the noise itself can be heard as an audio signal. When partially erased, the noise in the erased portion may differ from the previously recorded noise in its level and frequency component. Then, when the medium is continuously reproduced, the noise is different between the part that is not partially erased and the part that is partially erased, which causes a feeling of strangeness.

The present invention is a recording apparatus capable of erasing a part of a signal recorded on a medium, and when a medium whose part is erased is continuously reproduced, noises of an erased part and a non-erased part are generated. The purpose is to obtain a recording device that does not differ significantly.

[0009]

In order to solve the above-mentioned problems, the present invention provides traveling means for traveling a recording medium, position detecting means for detecting the position of the recording medium traveling by the traveling means, and Reproducing means for reproducing a reproduced signal from a recording medium; recording means for recording a recorded signal on the recording medium; measuring means for measuring a waveform of the reproduced signal; and a section of the medium measured by the measuring means. Measuring section setting means for setting, recording signal generating means for generating the recording signal based on the data measured by the measuring means, erasing section setting means for setting a section to be erased of the medium, and erasing section setting means The recording signal generated by the recording signal generating means is recorded in the section set by the recording means based on the position information detected by the position detecting means. It is obtained by the partial erasable recording apparatus constructed from a recording control means for recording on the medium by the step.

[0010]

With the above-mentioned means, the measuring means holds the reproduction signal of the measurement section set by the measurement section setting means as measurement data. The recording signal generating means generates a recording signal from the measurement data held by the measuring means. Then, the recording signal is recorded in the erase section. Then, since the recording signal is clear in the erase section, the difference between the erased portion and the non-erased portion is smaller than that in the case of simply erasing.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows the entire block of an embodiment of the present invention. The device 7 shown in FIG. 1 is a digital tape recorder having a partially erasable function.
The overall function of the digital tape recorder 7 is to convert an analog audio signal into a digital signal and record it on a magnetic tape, and convert the digital signal recorded on the magnetic tape into an analog audio signal for output. The digital tape recorder 7 is composed of many elements, and each element is connected to the bus 8. Each component is
Digital signals and control data having voice information are sent to the bus 8, and digital signals and control data are received from the bus 8.

Although the block diagram of the digital tape recorder 7 shown in FIG. 1 is shown as a set of means necessary for constructing the present invention, each means is actually dedicated to CPU, memory and digital signal processing. It is composed of an integrated circuit (DSP) and a program for operating them.

Reference numeral 1 is a traveling means. The running means 1 runs a magnetic tape. The running means 1 includes a running mechanism for running the magnetic tape of the digital tape recorder and a mechanism control circuit for controlling the operation of the mechanism. The running means 1 runs the magnetic tape from an arbitrary start point to an arbitrary end point. Traveling means 1
Runs the magnetic tape in several running modes.
Typical running modes are playback running, forward fast forward running,
There are reverse fast forward and stop modes.

Reference numeral 5 is a position detecting means. The position detecting means 5 detects the position of the magnetic tape running by the running means 1. The magnetic tape is assigned position information in units of time from the beginning to the end. If the length of the magnetic tape is for 2 hours, the starting point is 00:00
At the end of the second, the end is at 2 hours 0 minutes 0 seconds. In practice, the unit of seconds can be further subdivided to handle information on positions of 1 second or less. The position information indicating the position of the magnetic tape is recorded on the magnetic tape by a dedicated code in a place different from the digital signal containing the audio information recorded on the magnetic tape. The signal output by the position detecting means 5 is information on the current position of the magnetic tape, and is a coded unit of time.

Reference numeral 2 is a reproducing means. The reproduction means 2 reproduces a reproduction signal from the magnetic tape that is run by the running means 1. The reproduction signal output by the reproduction means 2 is a digital signal having information of an analog audio signal.

Reference numeral 3 is a recording means. The recording means 3 records a recording signal on the magnetic tape run by the running means 1. The recording signal recorded by the recording means 4 is a digital signal having information of an analog audio signal. Both the reproduction signal reproduced by the reproduction means 2 and the recording signal recorded by the recording means 4 can be converted into an analog signal to be an audio signal.

The reproducing means 2 and the recording means 3 have a specific positional relationship on the magnetic tape. The position of the magnetic tape reproduced by the reproducing means 2 is always upstream of the position of the magnetic tape recorded by the recording means 3. That is,
When the signal reproduced by the reproducing means 2 is delayed in time and recorded by the recording means 3, the same signal can be recorded at the position of the signal reproduced by the reproducing means 2. The time delay of signals in the case of overlapping recording depends on the reproducing position on the magnetic tape, the recording position and the relative speed of the magnetic tape.

Reference numeral 4 is a measuring means. The measuring means 4 measures the reproduced signal reproduced by the reproducing means 2. The measuring means 4 includes a semiconductor memory capable of storing the reproduced signal as measurement data for a preset time.

Reference numeral 6 is a measuring section setting means. Information on a section measured by the measuring unit 4 is set in the measuring section setting unit 6. The information on the measurement section is a combination of information on two positions, a start point and an end point. These two pieces of position information are used in association with the position information detected by the position detecting means 5. Therefore, the information on the two positions indicating the measurement section is the information on the position having a unit of time. When the measurement section is set in the measurement section setting unit 6, the measurement unit 4 measures the reproduction signal from the start point to the end point.

Reference numeral 9 is a recording signal generating means. The recording signal generating means 9 generates a recording signal from the reproduction signal measured by the measuring means 4. The generated recording signal is recorded on the magnetic tape of the traveling means 1 through the recording means 3.

Reference numeral 10 is an erasing section setting means. In the erasing section setting means 10, a section in which the signal generated by the recording signal generating means 9 is recorded on the magnetic tape of the traveling means 1 through the recording means 3 is set. Erasing section setting means 10
Includes a keyboard for entering numerical values and a display unit for displaying the entered numerical values. Further, the erasing section setting means 10 includes a display section showing information on the current position. The information on the erase section set in the erase section setting means 10 is a combination of information on the start point and the end point.
The information on the two positions is used in association with the information on the positions detected by the position detecting means 5. Therefore, the information on the two positions indicating the erasing section is the information on the position having a unit of time.

Reference numeral 11 is a recording control means. The recording control means 11 causes the recording means 3 to drive the recording signal generated from the signal generating means 9 based on the information of the erasing section set in the erasing section setting means 10 and the information of the position of the position detecting means 5 by the recording means 3. It records on the magnetic tape of 1.

Reference numeral 12 is an input means. Reference numeral 13 is an analog input terminal. 14 is a digital input terminal.
The input means 12 includes an analog / digital conversion circuit and a digital input interface circuit. An analog audio signal can be input to the analog input terminal 13. When an analog signal is input from the analog input terminal 13, the analog signal is converted into a digital signal by the analog / digital conversion circuit of the input means 12. The converted digital signal is sent to the bus 8 and becomes a digital signal. In addition, a digital signal that has already been converted into a digital signal is input to the digital input terminal. When a digital signal is input to the digital input terminal 14, the digital input interface circuit of the input means 12 sends the digital signal to the bus 8. The input means 12 inputs from one of the analog input terminal 13 and the digital input terminal 14 to 1 as necessary.
Choose one.

Reference numeral 15 is an output means. Reference numeral 16 is an analog output terminal. Reference numeral 17 is a digital output terminal.
The output means 15 includes a digital / analog conversion circuit and a digital output interface circuit. An analog audio signal can be output from the analog output terminal 16. When outputting an analog audio signal from the analog output terminal 16, the digital-analog conversion circuit converts the digital signal sent from the bus 8 into an analog signal and outputs the analog signal. Digital output terminal 17
Can output a digital signal. To output a digital signal from the digital output terminal 17, the digital output interface circuit receives the digital signal from the bus 8 and outputs it from the digital output terminal 17.

Reference numeral 181 is a system control means. The system control means 181 is connected to the bus 8
It controls the components of the tape recorder 7 and controls the synchronization of digital signals. In FIG. 1, measuring means 4, measuring section setting means 6, recording signal generating means 9, recording control means 1
1. The block 27 including the system control means 181 is C
PU, digital signal processing dedicated integrated circuit (DSP),
It is composed of a memory and a program for operating them.

FIG. 2 is an explanatory diagram of a case where the digital tape recorder 7 shown in FIG. 1 partially erases the magnetic tape. 18 is a magnetic tape. 19
Is the start end of the magnetic tape 18, and 20 is the end thereof. Position information having a unit of time is assigned to the magnetic tape 18 from the start end 19 to the end 20. The magnetic tape 18 is a magnetic tape for 2 hours,
If the start end is 0:00:00, the end time is 2 hours, 0 minutes, and 0 seconds. In FIG. 2, the erase section T is between T1 and T2. The erasing section T is a section in which the starting time is T1 and the ending time is T2, and partial erasing is performed. Section BB represented by B1 to T1 and section B represented by T2 to B2
E is a measurement section. The section BB is the first measurement section, and the section BE is the second measurement section.

FIG. 3 shows the erase section setting means 1 shown in FIG.
0 shows the appearance of 0. Reference numeral 21 is a first display unit. Information on the current magnetic tape position detected by the position detection means 5 is displayed on the first display unit. The information on the current position displayed on the first display unit 21 changes momentarily as the magnetic tape 18 runs. 22 is a second display unit. The start time T1 of the erase section T is displayed on the second display unit 22. Reference numeral 23 is a third display unit. The end time T2 of the erase section T is displayed on the third display unit 23. Reference numeral 24 is an operation switch. Operation switch 24
Controls the running mode of the magnetic tape 18. By operating the operation switch 24, the magnetic tape 18 of the traveling means 1 travels in the respective traveling modes of reproduction traveling, forward fast forward traveling, reverse fast forward traveling and stop. 25
Is a keyboard. The keyboard 25 can directly set the time information on the second display unit 22 and the third display unit 23. Reference numeral 26 is a partial erase execution switch. The partial erase execution switch 26 is operated after setting the start time T1 of the erase section T on the second display unit 22 and the end time T2 on the third display unit 23. When the partial erase execution switch 26 is operated, the partial erase operation is automatically performed.

FIG. 4 shows the measurement section setting means 6 shown in FIG.
3 is a flowchart showing the configuration of FIG. The measurement section setting means 6 is realized as a program of a memory (not shown) of the block 27. 28 is a start step,
29 is an end step. Reference numeral 30 denotes a start time T1 of the erase section T set by the erase section setting means 10.
Is the step of reading. 31 is a step of reading the end time T2 of the erase section T set by the erase section setting means 10. Step 32 is a step of checking whether the start time T1 and the end time T2 are set. If both T1 and T2 are not set in step 32, the measurement section setting means 6 immediately ends the process. If both T1 and T2 are set, step 33 is reached.

33 denotes the first measurement section BB shown in FIG.
This is a step of setting the start time B1 of. Step 3
3, the start time B1 of the first measurement section BB is calculated from the start time T1 of the erase section T and the length of the first measurement section BB. The start time T1 is the erase section setting means 10
And read in step 30. First
The length of the measurement section BB is previously set in a memory (not shown) of the block 27 as an initial value. The length of the first measurement section BB is 0.01 seconds to 0.3 seconds,
The standard length is 0.1 seconds.

34 designates the second measurement section BE shown in FIG.
This is a step of setting the end time B2 of. Step 3
4, the end time B2 of the second measurement section BE is calculated from the end time T2 of the erase section T and the length of the second measurement section BE. The end time T2 is the erase section setting means 10
And read in step 31. Second
The length of the measurement section BE is set as an initial value in the memory (not shown) of the block 27 in advance. The length of the second measurement section BE is 0.01 seconds to 0.3 seconds,
The standard length is 0.1 seconds.

First measurement section BB and second measurement section B
The length of E is changed by the recording signal generating means generated by the recording signal generating means 9.

FIG. 5 shows the structure of the measuring means 4. The measuring means 4 is realized on a memory (not shown) in the block 27. The measuring means 4 is composed of two storage areas. Reference numeral 35 denotes a first storage area, and 36
Is the second storage area. The first storage area 35 has 3
It consists of two parts. In the portion B1, the first measurement section BB
The start time B1 of is stored. In the part T1, T1 which is the end time of the first measurement section BB and the start time of the erasing section T is stored. The digital signal of the first measurement section BB is stored in the portion BB. The second storage area consists of three parts. In the portion T2, the erase section T
T2, which is the end time of T2 and the start time of the second measurement section BE, is stored. The end time B2 of the second measurement section BE is stored in the portion B2. In part BE,
The digital signal of the second measurement section BE is stored. As the digital signals stored in the portions BB and BE, the digital signals output from the reproducing means 2 shown in FIG. 1 are stored as they are.

The recording signal generating means 9 is composed of a DSP and a program for operating the DSP. Figure 6
FIG. 3 is a configuration diagram showing a configuration of a recording signal generating means 9. The recording signal generating means 9 is composed of a digital crossfader. The digital crossfader gradually switches and outputs two digital signals. The digital crossfader gradually switches between the two signals over time to prevent sudden changes in value during switching.

The recording signal generating means 9 has two input terminals and one output terminal. 37 is a first input terminal and 38 is a second input terminal. 39 is an output terminal. A digital signal is input to the first input terminal 37 and the second input terminal 38. 40 is a first shift register. 41 is a second shift register. 42 is an address control circuit. The first shift register 40 holds the digital signal input from the first input terminal 37. Second shift register 41
Holds a digital signal input from the second input terminal 38. The address control circuit 42, according to the clock input from the clock input terminal 43, performs the first shift
The output of the digital signal held in the register 40 and the second shift register 41 is controlled.

Reference numeral 44 is a cross fader. The crossfader 44 adds a coefficient to the value of the digital signal output from the first shift register 40 and the value of the digital signal output from the second shift register 41 according to the control signal of the address control circuit 42. Multiply, then add two digital signals and output. This coefficient gradually changes according to the clock signal input to the clock input terminal 43. When the coefficient by which one digital signal is multiplied changes to 1.0, 0.9 and 0.8 so as to gradually decrease toward 0, the coefficient by which the other digital signal is multiplied is 0. , 0.1, and 0.2, gradually increasing toward 1.0. Then, when the two coefficients are added, it becomes 1.0. As a result, the digital signal input to the first input terminal 37 and the digital signal input to the second input terminal 38 are gradually switched and output from the output terminal 39.

FIG. 7 and FIG. 8 are digital circuits shown in FIG.
FIG. 7 is an operation explanatory diagram when the partial erasure is edited by the tape recorder 7. FIG. 7 shows the erase section T shown in FIG.
However, the operation in the case of being relatively shorter than the measurement sections BB and BE will be explained. FIG. 8 shows that the erase section T shown in FIG.
The operation in the case of being relatively long compared to the measurement sections BB and BE is described. In addition, C shown in FIGS.
0, C1, C2, ... Shows the current time.

In the example shown in FIG. 7, the length of the erase section T is
The case where the length is shorter than the total length of the first measurement section BB and the second measurement section BE is shown.

(Determination of Erasing Section) In order to perform partial erasing by the digital tape recorder 7, the section for partial erasing is determined. To determine the section for partial erasing, the operation switch 24 of the erasing section setting means 10 is operated to move the magnetic tape 18 traveling by the traveling means 1 back and forth. When the magnetic tape 18 moves, the magnetic tape 1
The signal recorded in 8 is reproduced by the reproducing means 2 and output from the output terminals 16 and 17 of the output means 15. At this time, the current positions C1 and C of the magnetic tape 18
2, C3, ... Are displayed on the first display unit 21, and when the magnetic tape 18 runs, the display on the display unit 21 changes moment by moment. FIG. 7 shows an example in which the start position T1 of the erase section T is C4 and the end position T2 of the erase section T is C9.

(Setting of erasing section) When the erasing section T is determined, the keyboard 25 of the erasing section setting means 10 is operated to set the starting position T1 and the ending position T2 of the erasing section T in the erasing section setting means 10. Set. In the example shown in FIG.
The start position T1 is set to C4 as a value, and the end position T2 is set.
Sets C9 as the value. Then, the time of C4 is displayed on the second display unit 22, and the third display unit 23 is displayed.
Indicates the time of C9.

(Setting of measurement section) Erase section setting means 10
Thus, when the setting of the erasing section T is completed, the measuring section is set in the measuring section setting means 6. At the time when the start position T1 and the end position T2 are set in the erasing section setting means 10, the measurement section setting means 6 follows the flowchart shown in FIG. 4 and starts the first position B1 of the first measurement section BB and the second measurement. The end position B2 of the section is calculated. In the example shown in FIG. 7, C1 is obtained as the value of the start position B1 of the first measurement section BB and the end position B2 of the second measurement section BE.
C12 is obtained as the value of.

(Preliminary running for measurement) Next, the operation switch of the measuring section setting means 10 is operated to include at least the first measuring section BB and the second measuring section BE. Play and run. This reproduction traveling is performed before the measuring unit 4 executes the partial erasing in order to measure the reproduction signal. When this reproduction traveling is performed, the digital signal of the first measurement section BB and the digital signal of the second measurement section BE are held in the measuring means 4, as shown in FIG.

(Executing Partial Erase) Next, the partial erase execution switch 26 shown in FIG. 3 is operated. Then, the magnetic tape 18 of the traveling means 1 returns to the position before C4 shown in FIG. 7 (for example, C0), and the reproduction traveling is started.

Present time C4 The recording signal generating means 9, the recording control means 11 and the recording means 3 start the operation. The digital signal output from the reproducing means 2 is input to the first input terminal 37 of the recording signal generating means 9, and the digital signal of the first storage area 35 of the measuring means 4 is input to the second input terminal 38. BB is input. At the position where the current time is C4, the recording signal generating means 9 has not yet switched the signal to be output to the output terminal. Therefore, as the signal output from the output terminal 39 of the recording signal generating means 9, the digital signal output from the reproducing means 2 input to the input terminal 37 is output as it is, and the first measurement input to the input terminal 38. The digital signal in the section BB is not output. Incidentally, when the output of the reproducing means 2 passes through the recording signal generating means 9 and is recorded on the magnetic tape 18 by the recording means 3, there is a time delay and the same position is reproduced by the reproducing means 2. The digital signal of is recorded.

Current time C5 Current time is from C4 to C5
When changing to, the recording signal generating means 9 gradually switches the signal. The value of the digital signal output from the reproducing means 2 input to the first input terminal 37 gradually decreases, and the digital signal of the first measurement section BB input to the second input terminal 38 is Its value rises gradually.
Then, when the current time reaches C5, the switching of the digital signal is completed.

Current time C6 Current time is from C5 to C6
When it changes to, the recording signal generating means 9 does not switch the signal. At the output terminal 39 of the recording signal generating means 9, the first measurement section B inputted to the second input terminal 38 is inputted.
The B digital signal is output as it is. Then, when the current time reaches C6, the digital signal of the second measurement section BE stored in the second storage storage area 36 of the measuring means 36 is stored in the first input terminal 37. Is entered.

Current time C7 Current time is from C6 to C7
When it changes to, the recording signal generating means 9 gradually switches the signal. The value of the digital signal of the second measurement section BE input to the first input terminal 37 of the recording signal generating means 9 gradually rises, and the first measurement section BB input to the second input terminal 38. The value of the digital signal of is gradually decreased. Then, when the current time reaches C7, the signal switching is completed. When the current time is C7, only the digital signal of the second measurement section BE is output from the output terminal 39.

Current time C8 Current time is from C7 to C8
When it changes to, the recording signal generating means 9 does not switch the signal. At the output terminal 39 of the recording signal generating means 9, the second measurement section B input to the first input terminal 37 is input.
The E digital signal is output as it is. Then, when the current time reaches C8, the second input terminal 38 is
The digital signal output from the reproducing means 2 is input again.

Current time C9 Current time is from C8 to C9
When it changes to, the recording signal generating means 9 gradually switches the signal. The value of the digital signal of the second measurement section BE input to the first input terminal 37 of the recording signal generation means 9 gradually decreases, and the digital signal of the reproduction means 2 input to the second input terminal 38. The value of increases gradually.
Then, when the current time reaches C9, the signal switching is completed. When the current time is C9, only the digital signal of the reproducing means 2 is output from the output terminal 39. Then, the recording signal generating means 9, the recording control means 11, and the recording means 3 complete the operation.

FIG. 8 shows the case where the length of the erase section T is longer than the total length of the first measurement section BB and the second measurement section BE. In this case, the current time is from C1 to C
Up to 6 is the same as the case shown in FIG. Also, C15
7 to C12 are the same as C7 to C12 in FIG. 7, and the description thereof will be omitted.

From C6 to C10, the first input terminal 37 and the second input terminal 38 of the recording signal generating means 9 are
Both inputs the digital signal of the first measurement section BB. Therefore, the digital signal output from the output terminal 39 of the recording signal generating means 9 is always the digital signal of the first measurement section BB. However, the first measurement section BB
Has a length from C1 to C4, and the first measurement section B
It is shorter than the section from C4 to C11 where the B digital signal is required. Therefore, the recording signal generating unit 9 causes the digital signal of the first measurement section BB to be overlapped with that section while the time is shifted.
Connect one after another. That is, from C4 to C11,
The digital signal of the first measurement section BB is recorded several times.

When the current time changes from C10 to C11, the recording signal generating means 9 switches the signal. When the current time is C10, the digital signal of the second measurement section BE is input to the first input terminal 37 of the recording signal generation means 9, and the first measurement section is input to the second input terminal 38. The BB digital signal is input. The current time is C
When changing from 10 to C11, the second measurement section BE
The digital signal value of the signal gradually rises, and the first measurement section B
The value of the B digital signal gradually decreases. Then, when the current time reaches C11, the signal switching is completed.

From the current time C11 to C14, the signal output from the output terminal 39 of the recording signal generating means 9 is
It is only the digital signal of the second measurement section BE. However, the length of the second measurement section BE is only from C17 to C20, which is shorter than the section from C10 to C17 in which the digital signal of the second measurement section BE is required. Therefore, the digital signal of the second measurement section BE is sequentially connected to the section by the recording signal generating means 9 so that the digital signals of the second measurement section BE overlap with each other while shifting the time. That is, the digital signal of the second measurement section BE is recorded several times from C10 to C17.

In the description of the above embodiment, the current times C0, C1 ... Are arranged at equal intervals, and the start point and end point of the operation of each component coincide with each time. Explained. However, this matching is for ease of explanation, and for example, between C0 and C1 may be further subdivided. Further, in the above-mentioned embodiment, the example in which the measurement section and the erase section are adjacent to each other has been shown.
There is practically no problem even if they are slightly apart. Further, in the above example, the measurement section is an example in which the first measurement section and the second measurement section are arranged on both sides of the erase section. But,
In some cases, it is possible to use only one measurement section. In particular, when the erase section T is as short as 0.5 seconds or less, only one measurement section is often sufficient.

In the above example, as shown in FIG.
When the length of the erase section T is longer than the length obtained by adding the first measurement section BB and the second measurement section BE, the digital signal of the first measurement section BB is used in the first half of the erase section T, An example of using the digital signal of the second measurement section BE was shown in the latter half. However, within the erase section T, the digital signal of the first measurement section BB and the digital signal of the second measurement section BE may be used in any order, for example, they may be used alternately. Good.

The above embodiment is based on the digital signal shown in FIG.
An example in which the present invention is applied to the tape recorder 7 is shown, but there is no substantial difference between the recording medium and a magnetic disk or an optical disk. When using media other than magnetic tape,
If the medium traveled by the traveling means 1 is changed, most of the other constituent elements can carry out the present invention with almost the same configuration.

The structure of the recording signal generating means 9 is shown in FIG.
As described above, an example in which the digital crossfader is used has been described. However, in other embodiments, various elements may be included. The recording signal generating means 9 is a digital portion in which a digital signal does not change suddenly in a connection portion of a portion to be partially erased and a portion not to be partially erased, and a portion to be partially erased and a portion not to be partially erased. The recording signal is generated so that there is no significant difference in the frequency component of the signal and its level. It suffices for the recording signal generating means 9 to generate a signal equivalent to the noise recorded in the measurement section.

Therefore, the recording signal generating means 9 may analyze the frequency component of the digital signal held in the measuring means 4 and its level and generate a new signal. By doing so, it is possible to freely generate the recording signal, and it is possible to cope with the case where the lengths T of the erasing sections and the lengths of the measuring sections BB and BE are significantly different. Recording signal generating means 9
However, if a new signal is generated, the erase interval T
However, even if it is very short such as 0.1 seconds,
A recording signal can be generated. Further, if the recording signal generating means 9 generates a new signal, it is possible to analyze the waveforms on both sides of the erasing section and prevent a steep step from occurring in the signal.

[0058]

According to the recording apparatus capable of partially erasing according to the present invention, when partial erasing is performed, the difference in noise between the partially erased portion and the portion not partially erased is reduced. Therefore, when the part that has been partially erased and the part that has not been partially erased are continuously reproduced, there is no discomfort, and good editing can be performed.

[Brief description of drawings]

FIG. 1 is a block diagram showing the overall configuration of an embodiment of the present invention.

FIG. 2 is an explanatory diagram of the concept of partial erasure.

FIG. 3 is an external view of erase section setting means.

FIG. 4 is a flowchart showing the operation of the measurement section setting means.

FIG. 5 is an explanatory diagram of a concept of a storage area of a measuring unit.

FIG. 6 is a block diagram showing a configuration of recording signal generating means.

FIG. 7 is an operation explanatory diagram of the embodiment of the present invention.

FIG. 8 is an operation explanatory diagram of the embodiment of the present invention.

[Explanation of symbols]

 1 traveling means 2 reproducing means 3 recording means 4 measuring means 5 position detecting means 6 measuring section setting means 9 recording signal generating means 10 erasing section setting means 11 recording control means

Claims (6)

[Claims] 1. A traveling means for traveling a recording medium, a position detecting means for detecting a position of the recording medium traveling by the traveling means, a reproducing means for reproducing a reproduced signal from the recording medium, and recording on the recording medium. Recording means for recording a signal, measuring means for measuring the waveform of the reproduction signal,
Measuring section setting means for setting a section of the medium to be measured by the measuring means, recording signal generating means for generating the recording signal based on the data measured by the measuring means, and an erasing section of the medium are set. The recording signal generated by the recording signal generation means is recorded on the medium by the recording means in the erased area setting means and the area set by the erased area setting means based on the position information detected by the position detecting means. A partially erasable recording device composed of recording control means. 2. The recording control means, when the erasing section is set in the erasing section setting means, causes the measuring section setting means to perform a first measuring section before the erasing section and after the erasing section. 2. The partially erasable recording device according to claim 1, wherein a second measuring section is set, and the measuring means measures the waveform of the reproduction signal in the first and second measuring sections. 3. The recording control means, when the erasing section is set in the erasing section setting means, causes the measuring section setting means to perform a first measuring section before the erasing section and after the erasing section. A second measurement section is set, the measuring means measures the waveform of the reproduction signal in the first and second measurement sections, and the recording signal generating means sets the measurement result of the first measurement section and Based on the measurement result of the second section, discontinuity occurs at the end of the reproduction signal and the beginning of the recording signal in the first measurement section, and at the end of the recording signal and the beginning of the reproduction signal in the second measurement section. 2. The partially erasable recording device according to claim 1, wherein the recording signal is generated so that the above-mentioned problem does not occur. 4. The recording signal generating means generates a recording signal having a length according to the length of the erasing section set in the erasing section setting means, based on the data measured by the measuring means. Alternatively, the partially erasable recording device according to 2 or 3. 5. The length of the first measurement section is 0.3 seconds or less, and the length of the second measurement section is 0.3 seconds.
The partially erasable recording device according to claim 2, which is within a second. 6. The running means, when the erasing section is set in the measuring section setting means, first causes the measuring means to run the medium for the first time in order to measure the measuring section, and then the erasing section. The medium is caused to travel a second time in order to record a recording signal by the recording means.
Alternatively, the partially erasable recording device according to 4 or 5.