JP2002133772A - Data recorder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To switch a music at a proper position by setting an optimum music switching method for an output source. SOLUTION: This data recording/reproducing device 10 includes a digital audio interface 40, and digital data are inputted via the digital audio interface 40. The digital data include audio data and its auxiliary information. The auxiliary information is detected by a system control microcomputer 24, which specifies the output source (regenerating device or the like) of the audio data according to the category code included in the auxiliary information and sets the optimum music switching method on the specified output source, thereby the audio data can be recorded on the disk 14a of an MD(micro disk) 14 in the optimum music switching method.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data recording device, and more particularly to a data recording device for recording, for example, audio data on a recording medium.

[0002]

2. Description of the Related Art An example of a conventional data recording apparatus of this type is disclosed in Japanese Unexamined Patent Application Publication No.
No. 1-126423 [G11B 20/10]. In this conventional recording apparatus, when a recording key is operated and a main power supply for supplying a drive voltage to a main block is turned on, a process of writing audio data to be recorded to a buffer memory is started, and a copy operation is started. Determine whether copying of audio data from the bit to the disc is permitted. When it is determined that copying is permitted, the audio data from the point when the recording key is operated is recorded on the disk.

[0003]

However, in this prior art, audio data can be recorded on a disk from the time when a recording key is operated, but a broadcast receiver such as a satellite broadcast is connected to a digital audio interface. After recording the audio data from the broadcast receiver on a disc, a reproducing apparatus for reproducing package media such as CD, MD or DAT is connected to a digital audio interface, and the audio data from such reproducing apparatus is recorded. In some cases, it was not possible to switch songs at an appropriate position. In other words, when recording audio data from a broadcast receiver, a time marker method that switches songs at fixed time intervals is adopted, whereas when recording audio data from a package media playback device, A synchro-marker method is adopted in which music is switched by adding m to U-bit data (user data) included in a predetermined format of the audio interface. Therefore, when the user does not change the setting of the music switching method, audio data of, for example, a CD is recorded with the setting of the time marker method remaining. For this reason, there has been a problem that it is determined that the music has been switched at a position different from the music break, and the music number is assigned.

[0004] Therefore, a main object of the present invention is to provide a data recording device capable of switching and recording music at an appropriate position without user operation.

[0005]

SUMMARY OF THE INVENTION The present invention is a data recording apparatus for recording audio data on a recording medium,
Receiving means for receiving audio data and additional information of the audio data, specifying means for specifying an output source of the audio data based on the additional information received by the receiving means, and a music switching method optimal for the output source specified by the specifying means And a recording means for recording audio data on a recording medium in a music switching system set by the setting means.

[0006]

The data recording apparatus of the present invention can record audio data desired by a user on a recording medium such as an MD. For example, digital data including audio data and its attached information is received by receiving means such as a digital audio interface provided in the data recording device. The specifying means specifies an output source of the audio data, that is, an audio data reproducing device or the like based on the attached information. Therefore, the setting means sets an optimum music switching method for the output source specified by the specifying means. For this reason, the recording means can record the audio data on the recording medium by an appropriate music switching method.

[0007] For example, the specifying means specifies the output source according to the category code included in the attached information.
An output source (category 9 can be easily specified) of a broadcast receiver for satellite broadcasting such as a player, an MD player, a DAT player, a BS or a CS, or an A / D converter.

In such a data recording device, when the output source is a player (reproducing device) of a package medium such as a CD, MD or DAT, the music is switched by the synchro marker method. That is, the music is switched based on the U-bit data (user data) included in the digital data transmitted from the package medium reproducing device.

If the output source is a broadcast receiver, the music is switched by the time marker method. That is, the music is switched every predetermined time.

Further, if the output source is an A / D converter,
The music is switched by the level marker method. For example, the level of audio data extracted by the digital audio interface is detected, the interval between songs is detected, and songs are switched.

[0011]

According to the present invention, the output source of audio data is specified, and the music switching method optimal for the specified output source is set. Therefore, the music is automatically switched at an appropriate position to record the audio data. It can be recorded on a medium.

The above objects, other objects, features and advantages of the present invention will become more apparent from the following detailed description of embodiments with reference to the drawings.

[0013]

Referring to FIG. 1, a data recording / reproducing apparatus 10 of this embodiment includes an optical pickup 12, and the optical pickup 12 irradiates a back surface of a disk 14a provided on a mini disk (MD) 14 with laser light. I do. Therefore, the optical pickup 12 determines the N pole and the S pole on the magnetic surface from the deflection surface of the reflected light from the disk 14a, and
The reproduction signal (audio data) recorded in a is taken out. The disk 14a is driven to rotate by a spindle motor 16. The audio data extracted by the optical pickup 12 is provided to an RF amplifier 18. R
The F amplifier 18 amplifies the audio data, and the amplified audio data is supplied to a decoder 20 and to a servo circuit 22.

The decoder 20 performs decoding processing for error correction (parity error and interleaving) and EFM (Eig (Eig)) on the audio data supplied from the RF amplifier 18.
ht to Fourteen Modulation) Perform processing such as demodulation processing.

The servo circuit 22 has a system control microcomputer (hereinafter simply referred to as “syscon”) 24 based on audio data supplied from the RF amplifier 18.
In accordance with the instruction, the rotation of the spindle motor 16 is controlled. The servo circuit 22 controls the rotation of a sled motor 26 for moving the optical pickup 12 in the radial (thread) direction of the disk 14a. Further, the servo circuit 22 controls a lens (not shown) provided on the optical pickup 12 to accurately trace on a track (not shown) provided on the disk 14a. That is, the servo circuit 22 controls the tracking servo and the focus servo according to the instruction of the system controller 24.

The audio data via the decoder 20 is stored in a DRAM 30 as a buffer memory according to an instruction from a memory controller 28. DRAM 30
Is read out at a constant data rate under the control of the system controller 24 in accordance with the instruction of the memory controller 28, and the ATRAC (Adaptive Transform
m Acoustic Coding) decoder 32. ATR
The AC decoder 32 demodulates (decompresses) the audio data compressed by the ATRAC method, and supplies the decompressed audio data to the D / A converter 34. Therefore, the audio data is converted into an analog signal and output from the output terminal 36. Thus, the disk 1
The audio data recorded in 4a is reproduced.

However, when the MD 14 is mounted, the disk 14
a, the management information of the audio data recorded in
The OC (Table Of Contents) information is read by the optical pickup 12, and the TOC information is stored in the RAM 24a according to an instruction from the memory controller 28. Note that the TOC information may be stored in the DRAM 30.
The system controller 24 reproduces audio data based on the TOC information. The TOC information includes the number of songs (the number of files), the start address (absolute time) and the end address (absolute time) of each song corresponding to the number of songs (the song number), and the number of unrecorded areas. Information such as a start address (absolute time) and an end address (absolute time) is included.

On the other hand, when digital data is input to the input terminal 38, the digital data is passed through a digital audio interface (hereinafter simply referred to as "interface") 40 to an ATRAC encoder 42.
Given to.

When receiving the digital data, the interface 40 extracts the audio data included in the digital data and supplies it to the ATRAC encoder 42. Further, the interface 40 extracts the accessory information included in the digital data and supplies the extracted information to the system controller 24.

The ATRAC encoder 42 encodes (compresses) the audio data according to the ATRAC method. The compressed audio data is transmitted under the control of the system controller 24.
The data is stored (stored) in the DRAM 30 according to an instruction from the memory controller 28. The DRAM 30 is used as a buffer memory, and the time axis of audio data is controlled by the memory controller 28 and the DRAM 30.
That is, the system controller 24 gives a read instruction to the memory controller 28 as necessary to record audio data on the disk 14a. Therefore, DR
The audio data stored in the AM 30 is read out in a burst. The audio data read by the memory controller 28 is given to an encoder 44,
The encoder 44 performs processing such as encoding processing for error correction (parity addition and interleaving processing) and EFM encoding processing.

The audio data processed by the encoder 44 is provided to a head drive circuit 46. The head drive circuit 46 is connected to the magnetic head 48 and
The magnetic head 48 is driven so as to apply a modulation magnetic field according to the audio data given from the disk 4 to the disk 14a. At this time, the optical pickup 12 is
The thermomagnetic recording is performed by a magnetic field modulation method using a modulation magnetic field provided from the magnetic head 48 and a laser beam provided from the optical pickup 12.
During the recording of the audio data, the system controller 24 determines the audio data TO
The C information is created using the RAM 24a (or the DRAM 30). When the recording of the audio data is completed, the data recording / reproducing device 10 records the created TOC information on the disk 14a and then ends the recording.

For example, the input terminal 38 is connected to a CD cable, an MD player, a DAT (digital audio tape) player or a satellite broadcast receiver such as a BS or CS using a connection cable (not shown). Connected.

Therefore, the input terminal 38 receives digital data from a player (reproducing device) of a package medium such as a CD player, an MD player, or a DAT player or a broadcast receiver. Further, an analog audio signal reproduced by an analog audio reproducing apparatus can be converted into digital data by an A / D converter (not shown) in the apparatus and input to the input terminal 38.

Such digital data is formed according to a predetermined format of the interface 40, and includes audio data (44.1 kHz sampling, 16-bit quantization) and additional information (subcode data) related to the audio data. .

Specifically, as shown in FIG. 2A, in the predetermined format of the interface 40, the sampling frequency is one frame, and this is a basic unit. This one frame includes digital output signals of the left channel and the right channel, and this digital output signal is transmitted in the order of the left channel and the right channel. Also, digital data corresponding to each channel is set as a subframe, and the configuration of the subframe is shown as in FIG.

As shown in FIG. 2B, the subframe is composed of 32 bits, and the first 4 bits are a preamble, which is used for synchronization and subframe identification.
The next 4 bits are AUX (reserved bits).
Following X, 20-bit audio data (audio samples) is provided. Following this audio data, V bit data, U bit data, C bit data, and P bit data as control signals are provided in order of one bit each.

The V bit data is a valid flag. If the valid flag is "0", it can be determined that the subframe is valid (reliable). On the other hand, if the valid flag is “1”, it can be determined that this subframe is invalid (unreliable). Therefore, the system controller 24 can determine whether to execute the data processing operation according to the V-bit data.

Further, user data is formed by an average of 1176 bits of data collected from each subframe in which U-bit data is transmitted. This user data directly represents the user data recorded on the reproduction side CD, MD, or DAT. For example, in the case of a package medium such as a CD or an MD, as shown in FIG. 3, user data includes so-called Q data, R data, and S data.
Data, T data, and U data are included. For simplicity, FIG.
Although each subcode data of D is shown, it is almost the same for CD. In the case of a package medium such as DAT, as shown in FIG.
User data including a start ID (SID) and a skip ID is formed.

Furthermore, when 192 pieces (1 word) of the C-bit data shown in FIG. 2B are collected from each channel,
Channel status data is configured. The format of the channel status data (IEC958 data format) is shown in FIG. Specifically, the first bit (bit 0) of one word is an identification bit for distinguishing whether the transmitter is for home use or business use. In the following bits 1 to 5, control information is described. For example, bit 2 is an identification bit for copyright protection, and if bit 2 is “1”,
Since copyright protection is not required, digital copying is possible indefinitely. If bit 2 is "0", digital copying is restricted because copyright protection is required. Bit 3 is an identification bit for the presence or absence of emphasis.

The following bits 8 to 15 are category codes, and bits 8 to 14 are specific codes according to the device (digital data reproducing device (output source)) on the transmitter side. In other words, this allows CD players,
MD player, DAT player, broadcast receiver or A
/ D converter and the like can be identified. That is, the category of the output source can be specified. Bit 15 is called an L bit and indicates the generation of digital audio data. In the case of recorded software that is generally sold or the like, bit 15 is set to “1”. However, in the case of an optical disk device such as a CD or MD or a broadcast receiver, the bit 15 is set to “0”, indicating recorded software.

Subsequently, bits 16 to 19 are source numbers, which are used to identify each device when a plurality of devices of the same category are connected. Bits 20-23 are
The channel number indicates the channel type of the digital audio interface (the interface 40 in this embodiment). Bits 24 to 27 describe the identification code of the sampling frequency, and bits 28 and 29 describe the precision of the sampling frequency. Bits 32 and beyond are unused.

The P bit data shown in FIG. 2B is a parity bit. For example, even parity is used as the parity bit, and a spare bit, audio data,
It is used for error detection for V-bit data, U-bit data and C-bit data.

For example, when recording audio data input via the input terminal 38, the user operates a record button (not shown) provided on the operation panel 52. Then, the recording mode is set. Then, when digital data is input via the input terminal 38, recording is started.

However, digital data from a CD player, MD player, and DAT player, digital data from a broadcast receiver, and digital data from an A / D converter are different from each other in their optimal music switching methods. If the song switching method is not set, there is a problem that, when recording (dubbing) the audio data of the package medium, the song is switched at an incorrect position (a position different from the break of the song).

In order to avoid this, in this embodiment, the output source (category) of the digital data is specified in accordance with the category code as described above, and an appropriate music switching system is set.

That is, when the output source is a player (reproducing apparatus) that reproduces a package medium such as a CD player, an MD player, or a DAT player, the output is based on the U bit data shown in FIG. The synchro marker method for switching songs is set. Specifically, when the output source is a CD player or an MD player, the TNO (number of songs) described in the data area of the Q data is referred to by referring to the Q data formed by collecting U bit data.
When is changed, the music is switched.
When the output source is a DAT player, the start ID of the user data formed by collecting the U bit data changes from “0” to “1” for a predetermined time (for example, 2 bits).
(~ 3 seconds) When "1" is detected, the music is switched.

When the output source is a broadcast receiver, a time marker method for switching music at predetermined time intervals is set. Therefore, in this case,
The music is switched at regular intervals, regardless of the breaks in the music.

Further, when the output source is an A / D converter, a level marker system for switching music in accordance with the level of audio data is set. In this case, the peak value of the audio data is held by the peak hold circuit 50 and output to the system controller 24. Then, the system controller 24 switches the music when the state in which the level of the held audio data is lower than the predetermined level is continuously detected for a predetermined time or more. That is,
The interval between songs is detected, and the songs are switched. However, the predetermined level and the predetermined time are set in advance, and the
Reference numeral 4 is stored in a ROM (not shown) or the like. The predetermined time is counted (measured) by a timer (not shown) in the system controller 24.

The above operation is performed by the system controller 24 in FIG.
Then, processing is performed according to the flowchart shown in FIG. 7, and the audio data is recorded on the disk 14a. When the main power supply of the data recording / reproducing apparatus 10 is turned on, the system controller 24 starts processing, and determines whether or not the recording button provided on the operation panel 52 has been pressed in step S1. Step S1
If the answer is "NO", that is, if the record button is not pressed, the process returns to the same step S1.

On the other hand, if "YES" in the step S1, that is, if the recording button is pressed, a recording mode is set in a step S3. In a succeeding step S5, it is determined whether or not the input of the digital data is OK. That is, it is determined whether or not digital data is input to the interface 40 via the input terminal 38. If "NO" in the step S5, that is, if the digital data is not input, the process returns to the same step S5 and waits for the input of the digital data. On the other hand, if "YES" in the step S5, that is, if digital data is input, a process of setting a song switching method by a category code is executed in a step S7, and then the process proceeds to a step S9.

In step S9, recording is started, and in step S11, the music is switched as appropriate according to the music switching method set in step S7. That is, the music number included in the TOC information is assigned. In step S13, it is determined whether a stop button (not shown) provided on operation panel 52 has been pressed. If “NO” in the step S13, that is, if the stop button is not pressed, the step S11
To switch the music in a timely manner according to the set music switching method. On the other hand, if “YES” in the step S13, that is, if the stop button is pressed, a recording end process is executed in a step S15, and the process ends.

Since the digital data input while the output source of the digital data is specified is held in the DRAM 30 in accordance with the instruction of the memory controller 28, the digital data from when the recording button is pressed until the recording is started. The audio data input between the disk 14a
Can be recorded.

When the process of setting the song switching method based on the category code in step S7 shown in FIG. 6 is started, the category code is read in step S21 as shown in FIG. In the following step S23, the output source is a CD player,
It is determined whether the player is an MD player or a DAT player. If "YES" in the step S23, that is, the output source is the CD player, the MD player, or the DAT
If it is a player, in step S25, a music switching method using a U bit, that is, a synchro marker method is set, and the process returns.

On the other hand, if "NO" in the step S23, that is, if the output source is not the CD player, the MD player or the DAT player, it is determined whether or not the output source is the broadcast receiver in a step S27. Step S2
If "YES" in 7 is determined, that is, if the output source is the broadcast receiver, in step S29, the music switching method for each fixed time, that is, the time marker method is set, and the process returns.

On the other hand, if "NO" in the step S27, that is, if the output source is not the broadcast receiver, it is determined that the output source is the A / D converter, and the level of the audio data is detected in the step S31. After setting the music switching method, that is, the level marker method, the program returns.

According to this embodiment, the output source of the digital data can be specified based on the category code, and the music switching method can be set according to the output source. And its management information can be recorded on the disc. Therefore, when reproducing an MD (disc) on which audio data is recorded, jumping or skipping can be performed to reproduce the desired music from the beginning. Also, random reproduction, program reproduction, and the like can be executed.

In this embodiment, a data recording / reproducing apparatus capable of recording and reproducing audio data has been described. However, an apparatus capable of recording only may be used.

In this embodiment, only the case where audio data is recorded has been described. However, when recording image data corresponding to an image such as a moving image or a still image, the same applies to each scene or one screen. Images can be switched and recorded every time.

[Brief description of the drawings]

FIG. 1 is an illustrative view showing one embodiment of the present invention;

FIG. 2 is a configuration diagram of digital data input to the data recording / reproducing apparatus shown in FIG. 1 embodiment.

FIG. 3 is a configuration diagram of MD user data (subcode) formed by U-bit data shown in FIG. 2;

FIG. 4 shows a DAT formed by U-bit data shown in FIG.
3 is a configuration diagram of user data of FIG.

FIG. 5 is an illustrative view showing a format of a channel status formed by C-bit data shown in FIG. 2;

FIG. 6 is a flowchart showing a part of the processing of the system control microcomputer shown in FIG. 1 embodiment;

FIG. 7 is a flowchart showing a setting process of a music switching method based on a category code of the system control microcomputer shown in FIG. 6;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Data recording / reproducing apparatus 14 ... MD24 ... System control microcomputer 32 ... ATRAC decoder 40 ... Digital audio interface 42 ... ATRAC encoder 48 ... Magnetic head 50 ... Peak hold circuit 52 ... Operation panel

Claims (5)

[Claims] 1. A data recording apparatus for recording audio data on a recording medium, comprising: receiving means for receiving the audio data and additional information of the audio data; and receiving the audio data based on the additional information received by the receiving means. Specifying means for specifying an output source of audio data; setting means for setting an optimum music switching method for the output source specified by the specifying means; and recording the audio data in the music switching method set by the setting means A data recording device comprising recording means for recording on a medium. 2. The method according to claim 1, wherein the specifying unit specifies the output source according to a category code included in the attached information.
The data recording device according to the above. 3. The data recording apparatus according to claim 1, wherein said setting means sets a synchro marker method as said music switching method when said output source is a package medium reproducing device. 4. The data recording apparatus according to claim 1, wherein said setting means sets a time marker method as said music switching method when said output source is a broadcast receiver. 5. The data recording apparatus according to claim 1, wherein said setting means sets a level marker system as said music switching system when said output source is an A / D converter.