JPH1069725A - Device and method of recording/reproducing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To allow even a user having no special skill in the use of recording/ reproducing devices to easily carry out the recording operation for a recorded tape-shaped recording medium at a different sampling frequency from the original one. SOLUTION: After a specified period is elapsed from the information on the readout of recording condition at a tape information readout mode prepared for the recording mode, the frequency of sampling clocks is set at a value in accordance with the information on the recording condition. But until a specified period is elapsed, a control means 7 which set the frequency of a sampling clock to the frequency corresponding to the setting of a switching means 12. By this, if recording is operated within the time before a predetermined time is elapsed, recording can be performed at the sampling frequency in accordance with the setting of the switching means 12, and even in a recorded tape, at a sampling frequency different from that of the recording medium of the tape.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[Table of Contents] The present invention will be described in the following order. Technical Field to which the Invention pertains Prior Art Problems to be Solved by the Invention Means for Solving the Problems Embodiments of the Invention (FIGS. 1 to 6) Effects of the Invention

[0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording / reproducing apparatus and a recording / reproducing method, for example, a DAT (Digital Audio Tape).
-recorder).

[0003]

2. Description of the Related Art Conventionally, there is DAT as a device for digitally recording an audio signal on a tape-shaped recording medium. This D
The AT converts the audio signal into digital data by sampling the audio signal with a sampling clock of a predetermined frequency, converts the audio signal into a data stream of a predetermined format, and places the data on a cassette tape, which is a tape-shaped recording medium, in a helical scanning system. It is made to record in. This allows the DAT to record audio signals with high sound quality. In the DAT, information such as a player name, a singer name, and recording conditions in addition to the input audio signal can also be recorded by digitizing the information.

In the DAT, the sampling clock frequency (hereinafter referred to as the sampling frequency f)
As referred to as _S), 32 [KHz], 44.1 [KHz], and 48
Three frequencies [KHz] are prepared. However, for professional equipment that requires high-quality sound quality, the required minimum frequency of 32 [KHz] is not adopted, and mainly 44.1 [KHz].
And 48 [KHz].

As described above, several frequencies are prepared as sampling frequencies f _S in the DAT, but generally one sampling frequency is used in one cassette tape. This is because if there are several sampling frequencies f _S in one cassette tape, it takes time to switch the sampling frequency f _S , so that the switching portion reproduces at the sampling frequency f _S different from that at the time of recording. This may cause noise to occur. When such a problem occurs, this can be avoided by performing a muting process in a general device, but it is not a process that should be allowed in a business device because performing a muting process results in information loss. Therefore, as described above, one sampling frequency is used in one cassette tape.

In order to prevent the sampling frequency f _S from being mixed, the sampling frequency f _S is generally determined as follows. That using a sampling frequency f _S according to the setting switch for setting the sampling frequency in the case of unrecorded and begin cassette tape case cassette tape is inserted in is not inserted, the recorded cassette tape has been inserted It has been made to use a sampling frequency f _S of the O connexion recorded cassette tape to read out the recording condition information recorded on the cassette tape in the case. This makes it possible to prevent the sampling frequency f _S from being mixed in one cassette tape.

In the case of a recorded cassette tape, the recording process is performed in accordance with the sampling frequency f _S of the tape. Therefore, when the recorded tape is reused, the recording process can be performed at a desired sampling frequency f _S. Disappears. For example cassette when the tape is recorded at a sampling frequency f _S of 44.1 KHz], the sampling frequency f of 48 [KHz] is a set switch for sampling frequency setting for the cassette tape set to 48 [KHz]
Even attempts to recording processing in _S, will be従Tsu the recorded cassette tape of the sampling frequency f _S, 48 [KHz
] Recording processing in the sampling frequency f _S becomes impossible for. For this reason, when a recorded cassette tape is reused, information recorded on the cassette tape is erased by an eraser or the like and then reused.

However, since there may be situations where erasing cannot be performed (for example, when there is no eraser at a location, etc.), even if a cassette tape is already recorded, it is necessary to wait until the recording condition information is read after the cassette tape is inserted. If during (time a to about 6 seconds) recording operation is performed, it is made to perform a recording process in従Tsuta sampling frequency f _S to the setting of the setting switch. Thus eraser recording process with different sampling frequencies f _S against not been recorded cassette tape even if you can not erase can be performed.

[0009]

By the way, in the DAT having such a configuration, a different sampling frequency can be applied to a recorded cassette tape by utilizing a mechanical time difference between insertion of the cassette tape and reading of the recording condition information. The recording process at f _S is realized. If this for the time due to mechanical changes insert the cassette tape until reading the recording condition information drawing the tape is shortened, the recording process with different sampling frequencies f _S against the recorded tape It may not be possible.

In fact, some recent DATs have a reduced time from insertion of a cassette tape to pulling out the tape and reading out the recording condition information to about 2.5 seconds. than the application of the method as described above for the user it will not be able to perform the recording operation with a margin, resulting in a fear that it becomes impossible to record processing at different sampling frequencies f _S against the recorded cassette tape There is. Actually, it is difficult to perform a recording operation in such a short time, and it seems that it is almost difficult to perform such a recording operation unless the user has a special skill who is accustomed to using the apparatus.

The present invention has been made in view of the above points, and enables a user without special skills to perform recording processing at a different sampling frequency on a tape-shaped recording medium on which recording has already been performed. An object of the present invention is to propose a recording / reproducing apparatus and a recording / reproducing method which can be easily performed.

[0012]

According to the present invention, in order to solve the above problems, in a recording mode, an input analog signal is converted into digital data by a predetermined sampling clock and recorded on a tape-shaped recording medium. A recording / reproducing apparatus that records the frequency of a sampling clock on a tape-shaped recording medium as recording condition information, reads digital data from the tape-shaped recording medium in a reproduction mode, converts the digital data into an analog signal by a sampling clock at the time of recording, and outputs the analog signal When the operation mode is the reproduction mode, the frequency of the sampling clock generated by the clock generation means is set to a frequency corresponding to the recording condition information read from the tape-shaped recording medium, and the tape information reading operation provided for the recording mode is performed. In the mode, the recording condition information is read from the tape-shaped recording medium. After the reading, the frequency of the sampling clock generated by the clock generating means after a predetermined time elapses is set to a frequency corresponding to the recording condition information, and is sampled at a frequency corresponding to the setting of the switch means until the predetermined time elapses. A control means for setting a clock frequency is provided.

In the tape information reading mode provided for the recording mode, after reading the recording condition information,
Control means for setting the frequency of the sampling clock to a frequency corresponding to the recording condition information after a predetermined time has elapsed, and setting the frequency of the sampling clock to a frequency corresponding to the setting of the switch means until the predetermined time has elapsed. With this arrangement, it takes time before the frequency of the sampling clock is switched to the frequency recorded on the tape-shaped recording medium. Therefore, if the recording operation is performed until the predetermined time elapses, the recording process can be easily performed at the frequency corresponding to the setting of the switch means,
Even a recorded tape-shaped recording medium can perform recording processing at a sampling frequency different from that of the tape-shaped recording medium.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawings.

In FIG. 1, reference numeral 1 denotes a DAT to which the present invention is applied as a whole, and a tape running mechanism including guide pins 2A and 2B and a capstan motor 2C is provided. Cassette tape 3
From the tape 3A. The rotating drum 4 comes into contact with the pulled-out tape 3A, whereby the audio signals recorded on the tape 3A are sequentially reproduced by the heads 5A and 5B provided on the rotating drum 4. And at the same time, head 5C,
5D allows the audio signal to be sequentially recorded on the tape 3A in a helical scan system. Incidentally, the reproduction or recording processing by the heads 5A to 5D is performed by the modulation / demodulation circuit 6A and the digital / analog converter (D / A).
/ A) 6B and analog / digital converter (A / D) 6C
This is performed by a recording / reproducing processing circuit 6 composed of:

Here, in the case of the reproduction mode, the head 5
The reproduction RF signal S1 read by A and 5B is first input to the modulation / demodulation circuit 6A of the recording / reproduction processing circuit 6,
Here, the signal is converted into digital audio data S2 by performing a predetermined demodulation process. The recording condition information and the like included in the reproduced RF signal S1 are also demodulated here and output to the control unit 7 including a CPU (Central Process Unit) as tape information S3.

The digital audio data S2 is input to a digital / analog converter (D / A) 6B, where it is converted to an analog audio signal S4. This analog audio signal S4 is output to a speaker (not shown) or an external output terminal. Incidentally, also in the tape information reading mode (so-called stale mode or pause mode) for reading only the recording condition information recorded on the tape 3A, the reading operation is performed by the heads 5A and 5B. The modulation / demodulation circuit 6A outputs the reproduced RF signal S
1, and demodulates the recording condition information and outputs the demodulated information to the control unit 7 as tape information S3.

On the other hand, in the recording mode, an analog audio signal S5 input from a microphone (not shown) or an external input terminal is input to an analog / digital converter (A / D) 6C, where it is converted to digital audio data S6. Is converted. The digital audio data S6 is input to the modulation / demodulation circuit 6A, where it is converted into a predetermined format together with recording condition information and the like, and then converted into a recording RF signal S7. The recording RF signal S7 is supplied to the heads 5C and 5D, whereby the audio signal is recorded on the tape 3A.

The DAT 1 is provided with a cassette presence / absence detector 10, which can detect whether or not the cassette tape 3 is inserted into the main body. More specifically, a bar-shaped switch (not shown) is provided at the position where the cassette tape 3 is loaded. It has been made to detect. Incidentally, the detection result detected by the cassette presence / absence detector 10 is output to the control unit 7 as cassette presence / absence information S8.

The DAT 1 has a guide position detector 1.
1 is provided to detect whether or not the tape 3A is pulled out. Specifically, when the tape 3A is pulled out, the guide pins 2A and 2B are moved in a predetermined direction by a drive motor (not shown).
Detects the positions of the guide pins 2A and 2B based on the drive position signal from the drive motor, and thereby
It is configured to detect whether or not A is pulled out. Incidentally, the detection result detected by the guide position detector 11 is output to the controller 7 as the tape pull-out state information S9.

The DAT 1 further includes a setting switch 12 for setting a sampling frequency and the setting switch 12.
Switch on / off detector 1 for detecting the switch state of the switch
3 are provided. If the setting switch 12 is switched to the terminal a, the switch on / off detector 13 determines that 48 [KHz] is set as the sampling frequency f _S , and the setting switch 12 is switched to the terminal b. if watsu determined that 44.1 KHz] as the sampling frequency f _S is set. This determination result is supplied to the control unit 7 as sampling frequency setting information S10.

Further, this DAT1 has a REC key and a PL key.
Various operation keys 14 such as an AY key are provided, and a switch state of the operation keys 14 is detected by a key on / off detector 15. That is, in the case of DAT1, the key-on / off detector 15 detects operation information input from the operation keys 14. Incidentally, the detection result detected by the key on / off detector 15 is the operation information S.
11 is output to the control unit 7.

The control section 7 controls execution of various processing such as recording processing and reproduction processing based on the input operation information S11, and controls the operation of the entire DAT. The control unit 7 includes cassette presence / absence information S8, tape pull-out state information S9, and sampling frequency setting information S1.
0 and either sampling black poke when recording or reproducing process on the basis of the operation information S11 to set the sampling frequency f _S which is indicated by the setting switch 12, or the sampling frequency f _S of the tape 3A obtained from the tape information S3 It is determined whether or not to set, and the result of the determination is used as sampling frequency information S12 in the modulation / demodulation circuit 6A
Output to As a result, the modulation / demodulation circuit 6A generates a sampling clock of the frequency designated by the sampling frequency information S12 by means of an internal clock generation means (not shown), and modulates and demodulates based on the sampling clock. Execute the process. Incidentally, this sampling clock is also supplied to the digital-to-analog converter 6B and the analog-to-digital converter 6C (not shown), and is also used as a sampling clock for analog or digital conversion. .

The procedure for determining the sampling frequency and other processing procedures such as recording and reproduction are described in ROM (Read
Only the memory 16 stores the program code, and the control unit 7 executes these processes based on the program code.

Here, the above-described recording condition information will be described. In the case of DAT, generally, information recorded on the tape 3A is roughly divided into two types: main data and sub data.
There are two data. Information mainly recorded such as an audio signal is recorded as main data, and additional information such as a music number and a playing time is recorded as sub-data. Here, as shown in FIG. 2, the block of the main data includes a synchronization signal of one symbol, a main ID of two symbols, and a main I of one symbol.
It consists of D parity and 32 symbols of main data. One block of main data is 288 in total.
It is composed of data bits. Incidentally, main data such as an audio signal is recorded in the main data portion of FIG. 2, and a subcode indicating recording condition information is recorded in the main ID portion.

The main ID portion is divided into two regions W1 and W2. The sub-code for main data is stored in the region W1, and the address of the main data block is stored in the region W2. It has been made like that. However, the sub-code is stored only in the case where the address of the main data block is even, as is apparent from the figure. There are seven codes, ID1 to ID7, as subcodes stored in this area W1, and the contents represented by these codes are defined as shown in FIG. That is, information on enphasis is used as ID1.
Information of the sampling frequency f _S used for recording is used as ID2, information of the number of channels is used as ID3, information of quantization rules is used as ID4, information of track pitch is used as ID5, and information of copy prohibition is used as ID6. , ID7 represent packing information.

As described above, in the case of DAT, in addition to the audio signal to be recorded, the sampling frequency f
Recording condition information such as _S and the number of channels is also recorded in the format shown in FIG. Therefore, in the case of the reproduction mode or the tape information reading mode, the main I
The sampling frequency f _S of the audio signal recorded by ID2 in D can be known. That is, in the DAT 1, the modulation / demodulation circuit 6A reads the main ID portion to obtain the recording condition information of the tape 3A, and supplies this to the control section 7 as the tape information S3.

The various processing procedures of the control unit 7 will be described below in order using a flowchart. First, after the power is turned on, the control unit 7 performs an initialization process by performing an initialization procedure as shown in FIG. That is, in step SP2 entered from step SP1, the control section 7 initializes various circuits, checks the sampling frequency set by the switch based on the sampling frequency setting information S10 from the switch on / off detector 13, and checks the value. Is set as the initial value of the sampling frequency f _S. When this is completed, the process moves to the next step SP3, and the initialization processing ends.

Next, the control unit 7 determines the operation mode as DAT by performing a mode determination procedure as shown in FIG. Incidentally, this mode determination procedure is repeatedly performed at a predetermined cycle (for example, once every 30 [ms]). First, in step SP11 entered from step SP10, the control unit 7 determines whether or not the operation key 14 has been pressed based on the operation information S11 from the key on / off detector 15. As a result, if it is determined that the operation key 14 has been pressed, the control unit 7 proceeds to step SP12 and
If it is determined that 4 has not been pressed, the flow shifts to step SP13.

In step SP12, the control section 7 determines which key has been pressed by checking the contents of the operation information S11. As a result, if the PLAY key has been pressed, the operation proceeds to step SP14, and the operation mode is determined to be reproduction. At this time, the reproduction mode is set by setting the reproduction flag (for example, set to "1") to indicate the reproduction mode. If the REC key has been pressed, the operation proceeds to step SP15 to determine that the operation mode is recording. At this time, the recording flag is set to indicate the recording mode. If the EJECT key has been pressed, the operation proceeds to step SP16, and the operation mode is determined to be eject (that is, cassette discharge). At this time, similarly, the eject flag is set to indicate the eject mode. These steps SP14 ~
When the determination in step SP16 ends, the control section 7 moves to step SP17 and ends the processing.

On the other hand, if the operation key 14 has not been pressed and the operation proceeds to step SP13, the control section 7 detects whether or not the cassette presence / absence state has changed based on the cassette presence / absence information S8. As a result, when there is a state change, the process proceeds to the next step SP18, and when there is no state change, the process proceeds to step SP17 and the process ends. Step S
At P18, the control unit 7 checks whether or not the state change has changed from the state without the cassette to the state with the cassette by checking the content of the cassette presence / absence information S8. As a result, if the status has changed from no cassette to the presence of the cassette, the process proceeds to the next step SP19. If the status has changed from the presence of the cassette to the absence of the cassette (that is, the ejection of the cassette), the process proceeds to step SP17 to end the process. Incidentally, at this time, a cassette flag indicating the presence of a cassette is set if it has been changed to the presence of a cassette, and the cassette flag is reset (for example, set to "0") if it has been changed without the cassette.

In step SP19, the control section 7 detects whether or not the tape has been pulled out based on the tape withdrawing state information S9 from the guide position detector 11. As a result, if the tape has been pulled out, the next step SP
Move to step 20 if the withdrawal is not completed
The process moves to 17 and ends. Incidentally, at this time, if the withdrawal is completed, the withdrawal flag is set. In step SP20, the control unit 7 determines that the operation mode is the tape information read mode, and sets a read flag indicating the read mode. When this ends, the process moves to step SP17 and ends. By performing such a mode determination procedure, the control unit 7 detects the operation mode of DAT1.
Incidentally, the actual reproduction operation, recording operation, eject operation, and the like are executed by another processing procedure other than the mode determination procedure.

Next, the control unit 7 determines a sampling frequency to be used for recording or reproduction by performing a sampling frequency determination procedure as shown in FIG. Incidentally, this sampling frequency determination procedure is performed at a predetermined cycle (for example, 30 [ms]).
Once). First, at step SP31 entered from step SP30, the control section 7 checks whether or not the cassette tape 3 has been inserted into the apparatus by checking the cassette flag. As a result, if the cassette tape 3 has not been inserted, the control section 7 proceeds to step SP32, in which a predetermined counter is set to "0". At the next step SP33, the sampling frequency setting information from the switch-on / off detector 13 is set. The sampling clock frequency is determined based on S10 (that is, the sampling frequency f _S is determined to be the sampling frequency corresponding to the setting switch 12). When this process ends, the control section 7 moves to step SP34 and ends the process.

On the other hand, if there is a cassette tape in step SP31, the control section 7 proceeds to step SP35. In step SP35, the control unit 7 detects whether or not the drawing of the tape 3A has been completed by checking the drawing flag. As a result, if the withdrawal is not completed, the process proceeds to step SP32 and the same processing is performed, and if the withdrawal is completed, the process proceeds to the subsequent step SP36. At step SP36, the control unit 7 detects whether the operation mode is the reproduction mode by checking the reproduction flag. As a result, in the case of the reproduction mode, steps SP37 to SP39 are skipped and step SP4 is skipped.
Move to 0.

In step SP40, the control section 7 detects whether or not the contents of the tape information S3 read from the tape 3A are valid. As a result, it proceeds to the following step SP41 if valid tape information S3 is here to determine the frequency of the sampling black stick to the sampling frequency f _S indicated by the tape information S3 (i.e. the sampling frequency f _S of the tape 3A sampling frequency To decide). On the other hand, if the tape information S3 is not valid (for example, the sampling frequency f _S for an unrecorded tape)
Is not recorded or the sampling frequency f
_{If S} is set to 32 [KHz], which cannot be generated as a device, etc.), the process proceeds to step SP33, and the sampling frequency f _S is determined to be the sampling frequency corresponding to the setting switch 12.

On the other hand, if the operation mode is not the reproduction mode in step SP36, the process proceeds to step SP37. In this step SP37, the control section 7 checks whether or not the operation mode is the tape information read mode for reading only the recording condition information by checking the read flag.
As a result, if the mode is not the tape information reading mode, the process proceeds to step SP34 without deciding the sampling frequency f _S , and the process is terminated. If the mode is the tape information reading mode, the process proceeds to the subsequent step SP38.

At step SP38, the control section 7 increments the counter value by adding "1" to the counter value. In the next step SP39, the control unit 7
Determines whether the counter value is greater than a predetermined value (constant A). If not, the process proceeds to step SP33, where the sampling frequency f _S is determined to be a sampling frequency corresponding to the setting switch 12, and if it is greater, the process proceeds to step SP40. after the tape information S3 read moved connexion detects whether valid, it determines the transfer connexion sampling frequency f _S to the sampling frequency of the tape 3A in step SP41. When this ends, the process moves to step SP34 and ends.

Incidentally, the constant A used for the determination in step SP39 is determined by the delay time X and the processing period T of this sampling frequency determination procedure. In the case of this embodiment, the delay time X is 3 [s] and the processing cycle T is 30
The constant A is set to 100 as [ms].

As described above, the control section 7 first checks whether or not the cassette tape 3 is inserted. If not, the control section 7 sets the sampling frequency f _S to the setting switch 1.
2 is determined. Thereafter, the inserted cassette tape 3, the tape when also completed withdrawal of tape 3A examines the operation mode, the sampling frequency f _S determines the sampling frequency of the tape 3A if reproduction mode, with the record mode if information read mode waits until the counter value exceeds the constant a, determines the sampling frequency f _S to the sampling frequency of the tape 3A Once beyond the constant a. As described above, in the tape information reading mode, the time until the sampling frequency f _S is determined by the counter is delayed.

In the above configuration, in the case of DAT1, the sampling frequency f _S used during reproduction or recording is determined by executing the sampling frequency setting procedure as shown in FIG. I do. First, the control unit 7 determines whether or not the cassette tape 3 is provided.
It is detected whether or not the cassette tape 3 has been pulled out.
There unless also completed drawer as was Yutsu, the counter value of the timing delay is set to "0", set to a frequency corresponding to the sampling frequency f _S to the setting switch 12.

On the other hand, a cassette tape 3 exists,
If the pulling out of the tape 3A has been completed, the control unit 7 checks the operation mode. As a result, if the operation mode is the playback control unit 7 sets the sampling frequency f _S based on tape information S3 to the frequency of the tape 3A. on the other hand,
If the operation mode is not the reproduction mode but the tape information reading mode prepared for the recording mode, a predetermined time has elapsed by checking whether the value of the counter is greater than a constant A after incrementing the value of the counter. whether determined, to set the sampling frequency f _S if the predetermined time has elapsed on the frequency of the tape 3A. Incidentally, at this time, if the counter value is smaller than the constant A (that is, if the predetermined time has not elapsed), the frequency is set to a value corresponding to the setting of the setting switch 12.

[0042] In this manner, the operation mode is set to the frequency of the tape 3A according to the recording condition information sampling frequency f _S immediately when the playback mode, the tape information read mode the operation mode is provided in the recording mode any For example, after a lapse of a predetermined time, the sampling frequency f _S is set to the frequency of the tape 3A according to the recording condition information, and until that time, the frequency is set to the frequency according to the setting switch 12. Thus, in the recording mode, it takes time before the sampling frequency f _S is switched to the frequency of the tape 3A. Therefore it is possible to perform the recording process at a frequency setting switch 12 by performing the recording operation while the delays have easily, it is possible to record treated with different sampling frequencies f _S against the recorded cassette tape 3 it can. In this case, since the switching of the sampling frequency f _S is delayed, the user can perform the recording operation with a margin.

Actually, in the case of this embodiment, it takes about 2.5 seconds from the insertion of the cassette tape 3 to the tape information reading mode due to the improvement of the tape running mechanism, but the sampling frequency determination shown in FIG. Since the procedure is performed every 30 [ms] and the constant A is set to 100,
The sampling frequency f _S switches after about 3 seconds have passed since the tape information reading mode was entered. That is, this D
For AT1, insert cassette tape 3 and then
5.5 seconds later, the sampling frequency f _S becomes tape 3
The frequency is switched to A. As described above, if it takes about 5.5 seconds before the frequency is switched, the user can perform the recording operation with a margin.

In the case of this embodiment, before switching the sampling frequency f _S to the frequency of the tape 3A, it is checked whether or not the tape information S3 read from the tape 3A is valid. _S is not changed. That is, unless the recording condition information obtained from the tape 3A is valid, the sampling frequency f _S is not changed. Thus even if the non-recorded tape is not recorded condition information is inserted, it can be carried out can adjust the sampling frequency f _S to the frequency of the setting switch 12, the recording process without problems. In this embodiment, since the switching of the sampling frequency f _S is delayed by the value of the counter, the frequency switching can be easily delayed and the delay time can be easily changed.

According to the above configuration, if the operation mode is the reproduction mode, the sampling frequency f _S is immediately set to the frequency of the tape 3A based on the recording condition information (S3).
The sampling frequency f _S is set to the frequency of the tape 3A if tape information read mode the operation mode is provided in the recording mode after the lapse of a predetermined time based on the recording condition information (S3), it until during the setting switch In the recording mode, it takes a long time to switch the sampling frequency f _S by setting the frequency according to the frequency of the tape 12. it can also be recorded processing at a frequency corresponding to the setting switch 12 performs recording processing in readily tape 3A with different sampling frequency f _S. In this way, even a user who does not have a special skill can realize the DAT 1 that can easily perform a recording process at a different sampling frequency on a cassette tape 3 on which recording has already been performed.

In the above-described embodiment, the case where the frequency setting by the setting switch 12 is set to two kinds of 48 [KHz] and 44.1 [KHz] has been described. However, the present invention is not limited to this, and the frequency setting by the setting switch 12 is not limited to this. Set 32 (KHz), 4
4.1 [KHz] and 48 [KHz] may be used. In short, the number of settings by the setting switch is not limited.

In the above-described embodiment, the present invention
The case where the present invention is applied to the AT1 has been described. However, the present invention is not limited to this. In the recording mode, an input analog signal is converted into digital data by a predetermined sampling clock and recorded on a tape-shaped recording medium, and the sampling clock is converted. A recording / reproducing apparatus that records the frequency of a tape as recording condition information on a tape-shaped recording medium, reads digital data from the tape-shaped recording medium in a reproduction mode, converts the digital data into an analog signal by a sampling clock for recording, and outputs the analog signal. The present invention can be widely applied.

[0048]

As described above, according to the present invention, in the tape information reading mode provided for the recording mode, after the recording condition information is read, the frequency of the sampling clock is set to the recording condition information after a lapse of a predetermined time. The control frequency is set to a frequency according to the setting of the switch means until the predetermined time elapses, so that the control means for setting the frequency of the sampling clock is provided until the predetermined time elapses. If the recording operation is performed, the recording process can be easily performed at a frequency corresponding to the setting of the switch means, and the recording process is performed at a sampling frequency different from that of the tape-shaped recording medium even for a recorded tape-shaped recording medium. be able to. In this way, even a user who does not have special skills can easily perform a recording process at a different sampling frequency on a tape-shaped recording medium on which recording has already been performed.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a DAT according to an embodiment of the present invention.

FIG. 2 is a schematic diagram showing a format structure of DAT main data.

FIG. 3 is a table showing the contents of subcodes in main data.

FIG. 4 is a flowchart showing an initialization procedure by a control unit.

FIG. 5 is a flowchart showing a mode determination procedure by a control unit.

FIG. 6 is a flowchart showing a sampling frequency determination procedure by a control unit.

[Explanation of symbols]

1 DAT, 3 cassette tape, 5A to 5D
Head 6, recording / reproducing processing circuit, 6A modulation / demodulation circuit, 6B digital / analog converter, 6C analog / digital converter, 7 control unit 10, cassette presence / absence detector, 11 ... Guide position detector, 12 ... Setting switch, 13 ... Switch on / off detector, 14 ...
... operation keys, 15 ... key on / off detector, 16 ...
ROM.

Claims (6)

[Claims] In a recording mode, an input analog signal is converted into digital data by a predetermined sampling clock and recorded on a tape recording medium, and the frequency of the sampling clock is used as recording condition information in the tape recording. A recording / reproducing apparatus for recording the data on a medium, reading the digital data from the tape-shaped recording medium in a reproducing mode, converting the digital data into an analog signal with the sampling clock, and outputting the analog signal; and a clock generating means for generating the sampling clock. Switch means for setting the frequency of the sampling clock; and when the operation mode is the reproduction mode, the frequency of the sampling clock generated by the clock generation means is determined according to the recording condition information read from the tape-shaped recording medium. Set the frequency and the operation mode In the tape information read mode provided for the recording mode, after reading the recording condition information from the tape-shaped recording medium, the frequency of the sampling clock generated by the clock generating means after a predetermined time has elapsed is determined according to the recording condition information. Set the frequency to
A recording / reproducing apparatus comprising: a control means for setting the frequency of the sampling clock to a frequency corresponding to the setting of the switch means until a predetermined time elapses. 2. The control means determines whether the recording condition information read from the tape-shaped recording medium is valid. If not, the control means sets the sampling clock to a frequency corresponding to the setting of the switch means. The recording / reproducing apparatus according to claim 1, wherein the frequency is set. 3. The method according to claim 1, wherein the control means increments the value of the counter at a predetermined cycle and determines whether or not a predetermined time has elapsed by checking whether or not the value of the counter has become larger than the predetermined value. The recording / reproducing apparatus according to claim 1, wherein 4. In a recording mode, an input analog signal is converted into digital data by a predetermined sampling clock and recorded on a tape recording medium, and the frequency of the sampling clock is used as recording condition information in the tape recording. In the recording / reproducing method of recording on a medium and reading out the digital data from the tape-shaped recording medium in a reproducing mode, converting the digital data into an analog signal by the sampling clock and outputting the analog signal, when the operation mode is the reproducing mode, the sampling clock is used. Is set to a frequency corresponding to the recording condition information read from the tape-shaped recording medium, and when the operation mode is a tape information reading mode provided for the recording mode, the recording condition information is read from the tape-shaped recording medium. After a predetermined time, the sampling clock Is set to a frequency corresponding to the recording condition information, and the frequency of the sampling clock is set to a frequency corresponding to the setting of the switch for frequency setting until a predetermined time elapses. Recording and playback method. And determining whether the recording condition information read from the tape-shaped recording medium is valid, and setting the frequency of the sampling clock to a frequency corresponding to the setting of the switch means if the recording condition information is not valid. 5. The recording / reproducing method according to claim 4, wherein: 6. The method according to claim 4, wherein the value of the counter is incremented at a predetermined cycle, and it is determined whether or not a predetermined time has elapsed by checking whether or not the value of the counter has become larger than the predetermined value. The recording / reproducing method as described.