JP3128489B2 - Information playback device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to an MD (mini disc).
The present invention relates to an information reproducing apparatus provided with a semiconductor memory such as a device.

[0002]

2. Description of the Related Art Conventionally, tape recorders have been widely used as information reproducing apparatuses. Recently, an MD device using a magneto-optical disk has attracted attention as a new information reproducing device. The MD device records an audio signal in a digital format on a rewritable magneto-optical disk. The digitized audio signal is stored in an ATRAC (Adaptive Transform).
The data is compressed by a high-efficiency encoding process called m Acoustic Coding, and is magneto-optically recorded on the magneto-optical disk.

[0003]

By the way, the MD device has a sound skipping prevention function. That is, when the laser beam of the optical pickup for reading data from the disk deviates from the information track portion of the disk due to vibration, so-called "sound skipping" occurs, which is a serious problem particularly in a portable type device used outdoors. .

For this reason, a buffer memory (hereinafter referred to as a "shock proof memory") for temporarily storing data read from a disk is provided, and the optical pickup is displaced from the information track due to vibration during reproduction, thereby interrupting the continuous flow of data to be reproduced. Even if the data stored in the shock proof memory is continuously reproduced, and before the data in the shock proof memory is completely lost, reading from the position of the information track before the optical pickup comes off due to vibration can be resumed, As a result, no sound skip occurs. Therefore, the larger the capacity of the shock-proof memory is, the longer the compensable time (time allowed from when the optical pickup is disengaged from the information track to return to the position of the next information track) is increased.

A reproducing apparatus having such a compensation function is:
The present invention is applied not only to the MD apparatus but also to a CD (compact disk) reproducing apparatus.
No. 0 (G11B20 / 10) and the like.

[0006] The sound skipping prevention function is provided not only in a portable but also in a stationary MD device, and is a standard specification.

In the portable MD device, there are two types, like a headphone stereo or the like, a device capable of recording and reproduction and a device capable of performing only reproduction. The two types of MD devices both have a sound skipping prevention function.

However, although the semiconductor memory constituting the shock-proof memory is expensive, the shock-proof memory is not used very effectively if the optical pickup does not come off the information track due to vibration or the like. become.

Accordingly, an object of the present invention is to effectively utilize this shock proof memory in addition to the sound skip prevention. In particular, in a playback-only MD device,
Although recording could not be performed at all up to now, a function of recording voice information and character information can be provided by using a shock-proof memory.

[0010]

According to the present invention, there is provided a reproducing means for reading information from a recording medium on which information is recorded, and a buffer memory for sequentially storing the information read by the reproducing means. An information reproducing apparatus configured to sequentially read and reproduce the information from the buffer memory, and an input means for inputting character information or external audio information, wherein the buffer memory is read by the reproducing means. And an area for storing character information or voice information input by the input means. The buffer memory stores the information read by the reproducing means, the character information or external information. To provide an information reproducing apparatus characterized in that audio information from a personal computer is stored independently of each other. A.

According to the present invention, the information reproducing apparatus further comprises means for reproducing the character information or the voice information stored in the buffer memory independently of the reproduction of the information on the recording medium. I do.

Further, according to the present invention, the information reproducing apparatus further comprises display means for displaying character information stored in the buffer memory.

[0013]

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

FIG. 1 is a circuit block diagram showing the configuration of an information reproducing apparatus (reproduction only) to which the present invention is applied. In the figure, reference numeral 31 denotes an analog signal input terminal to which an analog audio signal such as an audio signal is input; 32, an A / D conversion circuit for converting the audio signal input from the analog signal input terminal 31 into a digital signal; Is an ATR that compresses the digital signal output from the A / D conversion circuit 32 and converts it into a highly efficient encoded digital signal.
This is an AC compression processing circuit.

Next, reference numeral 34 denotes the ATRAC compression processing circuit 3.
A digital signal processing circuit for interleaving the digital signal processed in step 3, adding an error correction code thereto, and converting the digital signal into a digital signal to which a subcode signal is added; 35 is a shock-proof memory for temporarily storing digital signal data And is constituted by a DRAM (Dynamic RAM).

Reference numeral 43 denotes an optical pickup for converting information data read from the MD disk 41 into an electric signal, and reference numeral 36 denotes an R for converting the information data from the optical pickup 43 into a digital signal and generating a servo signal.
An F amplifier circuit 37 is a digital signal processing circuit that performs processing such as error correction on a signal output from the RF amplifier circuit 36. A digital signal processing circuit 38 expands the signal processed by the digital signal processing circuit 37 and converts the signal into an original digital signal. ATRAC to return
The expansion processing circuit 39 is the ATRAC expansion processing circuit 38.
Converts the digital signal output by the
An / A conversion circuit 40 is an analog signal output terminal for outputting an analog signal output from the D / A conversion circuit 39.

Further, reference numeral 44 designates the optical pickup 43 as M
This is a feed motor for reciprocatingly driving between the inner circumference and the outer circumference of the D disk 41, and is controlled via a servo control circuit 45 by a tracking error signal output from the RF amplifier circuit 36.

Next, 42 is a spindle motor for rotating the MD disk 41, and 46 is an MD for controlling the MD reproducing apparatus.
The control circuit is a control circuit for performing a transition to each mode such as playback, fast-forward, and fast-reverse of the mechanism, performing control based on an input signal from the operation key group 47, and processing subcode data. It controls the signal processing circuit 37, the servo control circuit 45, and the like.

FIG. 2 shows the shock-proof memory 3.
FIG. 5 is a conceptual diagram showing a configuration of a memory space of No. 5; In the figure, (A) is a main data area for a normal function for storing data for a shock-proof memory when a disc is normally reproduced, and (B) is a main data area for the (A) normal function. C2PO data area for normal function for storing data indicating the reliability of the stored data, (C) TOC and U of the disc being reproduced
This is a normal function TOC area for storing information such as the TOC.

(D) is an audio data area for special functions for recording audio data such as voice,
(E) is a special function text data area for recording text (character) data.

In the present embodiment, the shock-proof memory 35 uses a 16 Mbit DRAM. The (A) main data area for normal function, (B) the C2PO data area for normal function, and (C) the TOC for normal function are used. 4 Mbits are allocated as areas. And the remaining 12
Mbits are allocated to (D) special function audio data area and (E) special function text data area.

Of the 12 Mbit memory space,
(E) Text data area for special function
Allocate 2 bytes and the remaining 1,570,512 bytes
When te is assigned as the (D) special function audio data area, the text information is about 1792 characters in the (E) special function text data area, and the voice information is 43 seconds in the (D) special function audio data area. About 21 clusters) can be recorded.

Next, based on the flowcharts shown in FIGS. 6 and 7, a special function which is a feature of the apparatus of the present invention, ie, DR
The recording in the AM will be described in detail.

[1. First, FIG. 3 shows an example of an operation key group 47 of the apparatus of the present invention (FIG. 3 shows only operation keys of main parts, not all operation keys). In the figure, reference numeral 105 denotes a memory selection key for instructing a device to record / reproduce voice information or character information using the DRAM. Therefore, first, the memory selection key 105 is operated to select the DRAM recording / reproduction.

In the flowchart of FIG. 5, it is first checked in step (1) whether or not to perform DRAM recording. Here, the DRAM recording / reproduction is selected by operating the memory selection key 105 as described above. To the next step (2). When the DRAM recording / reproduction is not selected, a normal disk reproduction operation can be performed.

Next, the user operates the recording key 103.
In step (2), it is confirmed whether or not to perform the DRAM reproduction described later. If the DRAM reproduction described later is selected, the process proceeds to step (3), but the recording key 103 is operated as described above. Therefore, the process proceeds to step (10) following FIG. At this point, the recording has not been started yet, and the recording is temporarily stopped.

When recording, the memory selection key 1
The operation of the two operation keys 05 and the recording key 103 is performed in order to prevent the recording key 103 from being pressed when the device is put in a bag or the like, thereby preventing erroneous recording. .

In step (10), it is confirmed whether or not the DRAM recording is selected. Since the user operates the recording key 103 as described above, the DRAM recording is performed.
It is determined that recording has been selected, and the process proceeds to step (11).

In step (11), audio information DRAM
Either recording is selected, or DRAM for text information
Check if recording is selected. Here, the user operates the voice / character selection key 106 shown in FIG. 3 to select recording of voice information. Thereby, the process proceeds to step (12). Note that the voice / character selection key 106 is toggled, and the selection of voice / character switches each time the key is operated.

In step (12), the (D) special function audio data area in the DRAM is checked, and if there is a free area in the data area, the process proceeds to the next step (13). If there is no free area, the process proceeds to step (15). At this time, the remaining recordable time may be displayed on the display device 48 shown in FIG.

In step (15), (D) in the DRAM
The user is prompted to select whether or not to clear the data recorded in the special function audio data area (displayed on the display device 48). If the data area is to be cleared, the process proceeds to step (16). If the data already recorded is to be left, the DRAM recording is canceled and the process ends.

In the step (15), whether or not to clear the data may be determined by assigning this function to any one of the operation keys in the operation key group shown in FIG. May be provided. Here, the data area is cleared by operating the voice / character selection key 106 again.

In step (16), (D) in the DRAM
The data recorded in the special function audio data area is cleared, and the process proceeds to step (13).

In step (13), when the user operates the recording key 103 again, the recording pause state is released, and the (D) of the audio signal input from the analog signal input terminal 31 shown in FIG. ) Start recording in the audio data area for special function.

In step (14), the user operates the stop key 101 shown in FIG.
Until the M recording is stopped, the process returns to the step (12), and the recording is continued while checking whether or not there is an empty area in the (D) special function audio data area as described above.

(D) The recording of audio information in the (D) special function audio data area is completed when the free area of the special function audio data area is exhausted or the user operates the stop key 101. .

[2. Reproduction of audio information recorded in DRAM]
First, the DRAM recording / reproduction is selected by operating the memory selection key 105 shown in FIG. 3 as described above. In the flowchart of FIG. 5, it is confirmed in step (1) whether or not to perform DRAM recording. Since the DRAM recording / reproduction has been selected by operating the memory selection key 105 as described above, the process proceeds to the next step (2). In addition, DR
When the AM playback is not selected, a normal disc playback operation can be performed.

Next, the user operates the reproduction key 102.
In step (2), since the reproduction key 102 has been operated as described above, the process proceeds to the subsequent step (3). At this point, the reproduction has not been started yet, and the reproduction has been paused.

Then, the user operates the voice / character selection key 106 shown in FIG. 3 to select reproduction of voice information. As described above, the voice / character selection key 106 is toggled, and the selection of the voice / character is switched each time the key is operated.
As a result, it is determined in step (3) that audio information has been selected, and the process proceeds to step (4).

In step (4), the (D) special function audio data area in the DRAM is checked, and if there is no recorded audio data, the processing is terminated. If there is recorded data, step (5) is performed. Proceed to.

Next, the user operates the play / pause key 10 again.
When 2 is operated, the reproduction of the audio data recorded in the (D) special function audio data area is started in step (5).

Until the stop key 101 is operated by the user, the process returns to the step (6) and (D) the reproduction of the audio data recorded in the special function audio data area is continued.

(D) If all the audio data recorded in the special function audio data area is reproduced before the stop key 101 is operated by the user to stop the reproduction, The reproduction of the data may be automatically stopped or the reproduction may be repeated until the stop key 101 is operated (so-called repeat reproduction).

[3. DRAM Recording of Character Information] First, the memory selection key 105 shown in FIG. 3 is operated to instruct recording / reproduction of voice information or character information using the DRAM. In the flowchart of FIG. 5, whether or not to perform the DRAM recording is confirmed in step (1), and the DR is operated by operating the memory selection key 105 as described above.
Since AM recording / reproduction has been selected, the process proceeds to the next step (2). When the DRAM recording / reproduction is not selected, a normal disk reproduction operation can be performed.

Next, the user operates the recording key 103.
In step (2), it is confirmed whether or not to perform DRAM reproduction, which will be described later. Since the recording key 103 has been operated as described above, the flow proceeds to step (10) following FIG. At this point, the recording has not been started yet, and the recording is temporarily stopped.

When recording, the memory selection key 1
The operation of the two operation keys 05 and the recording key 103 is performed in order to prevent the recording key 103 from being pressed when the device is put in a bag or the like, thereby preventing erroneous recording. .

In step (10), it is confirmed whether or not the DRAM recording is selected. However, since the user operates the recording key 103 as described above, the DRAM recording is performed.
It is determined that recording has been selected, and the process proceeds to step (11).

In step (11), audio information DRAM
Either recording is selected, or DRAM for text information
Check if recording is selected. Here, the user operates the voice / character selection key 106 shown in FIG. 3 to select the recording of character information. Thus, the process proceeds to step (17). The voice / character selection key 106 is toggled, and the selection of voice / character is switched each time the key is operated.

In step (17), since the recording of character information has been selected as described above, the process proceeds to the next step (18). In step (18), the (E) special function text data area in the DRAM is checked, and if there is a free area in the data area, the process proceeds to the next step (19). If not, proceed to step (21). At this time, the number of recordable remaining characters may be displayed on the display device 48 shown in FIG.

In step (21), (E) in the DRAM
The user is prompted to select whether or not to clear the data recorded in the special function text data area (displayed on the display device 48). To clear the data area, the process proceeds to step (22). If the data already recorded is to be left, the DRAM recording is canceled and the process ends.

In step (21), whether or not to clear the data may be determined by assigning this function to one of the operation keys in the operation key group shown in FIG. May be provided. Here, the data area is cleared by operating the voice / character selection key 106 again.

In step (22), (E) in the DRAM
The data recorded in the special function text data area is cleared, and the flow advances to step (19).

In step (19), when the user operates the recording key 103 again, the recording pause state is released, and (E) recording in the special function text data area becomes possible. Here, characters to be recorded are input by operating the character input keys 104 shown in FIG. Since the character input key 104 is configured so that three characters are switched by toggle, when the character to be input is displayed on the display device, for example, when the recording key 103 is operated, the character is recorded. Similarly, characters can be input one after another. As described above, the maximum number of characters that can be recorded in this embodiment is 1792 characters.

In step (20), the user operates the stop key 101 shown in FIG.
Until the M recording is stopped, the process returns to the step (18), and the recording is continued while checking whether or not there is an empty area in the (E) special function text data area as described above.

(E) The recording of the character information in the (E) special function text data area is completed when the free area of the special function text data area is exhausted or the user operates the stop key 101. .

[4. Reproduction of character information recorded in DRAM]
First, the user operates the memory selection key 105 shown in FIG.
Select AM recording / playback. In the flowchart of FIG. 5, it is confirmed in step (1) whether or not to perform DRAM reproduction. Here, as described above, the memory selection key 1
Since 05 recording / reproduction has been selected by operating button 05, the process proceeds to the next step (2). When the DRAM reproduction is not selected, a normal disk reproduction operation can be performed.

Next, the user operates the reproduction key 102.
In step (2), since the reproduction key 102 has been operated as described above, the process proceeds to the subsequent step (3). At this point, the reproduction has not been started yet, and the reproduction has been paused.

Then, the user operates the voice / character selection key 106 shown in FIG. 3 to select reproduction of character information. As described above, the voice / character selection key 106 is toggled, and the selection of the voice / character is switched each time the key is operated.
Thus, it is determined in step (3) that the reproduction of the character information has been selected, and the process proceeds to step (7).

Since the reproduction of the character information has been selected as described above, the process proceeds to the next step (8) via the step (7). In step (8), the (E) special function text data area in the DRAM is checked, and if there is no recorded text data, the process is terminated.

On the other hand, if there is recorded data, the process proceeds to step (9), where (D) the text data recorded in the special function audio data area is displayed on the display device 48 shown in FIG. indicate.

FIGS. 4 and 5 show display examples of the display device 48 shown in FIG. First, FIG. 4 shows a display at the time of normal disc reproduction, in which a track name (music name in this example) 107 is displayed. On the other hand, FIG. 5 shows a display of the character information 108 recorded in the DRAM (a telephone number list in this example). In the character information 108, characters such as numerals are input using ten keys (numerical keys) of a remote control transmitter (not shown).

As described above, the maximum number of characters that can be recorded in this embodiment is 1792 characters, so that all character information cannot be displayed at one time. Therefore, FF
The skip key 108 and the REV skip key 107 are used to scroll and view character information.

In this embodiment, the DRAM is divided into four areas. However, when DRAM recording is selected,
(A) Main data area for normal function, (B) C2PO data area for normal function, and (C) TOC area for normal function are also used for DRAM recording, and more information is used for DRA.
M may be recorded.

In the above embodiment, the reproduction-only MD device has been described. However, the present invention is not limited to this, and it goes without saying that the invention can be applied to a device capable of recording and reproducing on a recording medium.

[0065]

As described above, according to the present invention, according to the present invention, a reproducing means for reading information from a recording medium on which information is recorded, a buffer memory for sequentially storing information read by the reproducing means, In an information reproducing apparatus configured to sequentially read and reproduce the information from the buffer memory, the information reproducing apparatus includes input means for inputting text information or external audio information, and the buffer memory is read by the reproducing means. An area for storing information, and an area for storing character information or voice information input by the input means, wherein the buffer memory stores the information read by the reproducing means, the character information or an external Since the audio information is stored independently of each other, the audio information is stored using the buffer memory that the device originally has. It is possible to perform the recording of the broadcast and character information, it is possible to effectively utilize the buffer memory. In particular, an apparatus dedicated to reproducing a recording function on a recording medium (disk) is extremely useful as an auxiliary recording means.

[Brief description of the drawings]

FIG. 1 is a circuit block diagram showing a configuration of an information reproducing apparatus according to the present invention.

FIG. 2 is a schematic diagram showing a configuration of a memory space of a DRAM in the device of the present invention.

FIG. 3 is a diagram showing a main part of the device of the present invention.

FIG. 4 is a diagram showing a display example of the device of the present invention.

FIG. 5 is a diagram showing a display example of the device of the present invention.

FIG. 6 is a flowchart showing the operation of the device of the present invention.

FIG. 7 is a flowchart showing the operation of the apparatus of the present invention.

[Explanation of symbols]

 Reference Signs List 31 analog signal input terminal 32 A / D conversion circuit 33 ATRAC compression processing circuit 34 digital signal processing circuit 35 shock proof memory (buffer memory) 36 RF amplifier circuit 37 digital signal processing circuit 38 ATRAC decompression processing circuit 39 D / A conversion circuit 40 Analog signal output terminal 41 MD disk 42 Spindle motor 43 Optical pickup 44 Feed motor 45 Servo control circuit 46 MD control circuit 47 Operation key group 48 Display device 101 Stop key 102 Play / pause key 103 Record key 104 Character input key 105 Memory selection Key 106 Voice / character selection key 107 Track name display 108 Character information display 109 FF skip key 110 REV skip key

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) G11B 20/10

Claims (3)

(57) [Claims] 1. A reproducing means for reading information from a recording medium on which information is recorded, a buffer memory for sequentially storing information read by the reproducing means, and a method for sequentially reading and reproducing the information from the buffer memory. Input means for inputting character information or external audio information
A step, wherein the buffer memory is read by the reproducing means.
And an area for storing the input information.
Storage area for the stored character information or voice information.
And the buffer memory is read by the reproducing means.
Information and the character information or external audio information
Is characterized in that the information is stored independently of each other.
Raw equipment. 2. The information reproducing apparatus according to claim 2 , wherein
Character information or voice information stored in the memory
Means for reproducing information independently of the recording medium
2. The information reproducing apparatus according to claim 1, further comprising:
apparatus. 3. The information reproducing apparatus according to claim 2 , wherein
Display means for displaying character information stored in the memory
2. The information reproducing apparatus according to claim 1, wherein
Place.