JP2005293670A - Information recording/reproducing device and method, and program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an information recording/reproducing device and an information recording/reproducing method by which data are smoothly reproduced, and simultaneously, data can be speedily recorded on a recording medium without breaking, and to provide a program. <P>SOLUTION: A recording control section 8 stops storage of data to a buffer memory 9, when occurrence of vibration is sensed in a vibration monitor section 11, and reopens the storage of data to the buffer memory 9, when the stoppage of the vibration is sensed in the vibration monitor section. Also, when a buffer memory monitor section 12 senses that the data of the buffer memory 9 are made empty, data writing to a hard disk 7 is stopped, and when the buffer memory monitor section 12 senses that the data are started to be stored again in the buffer memory 9 and the stored amount exceeds the predetermined amount, data writing to the hard disk 7 is restarted while making the data at the restart coincide with the data at the stoppage of the writing. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an information recording / reproducing technique for temporarily storing data in a buffer memory such as a buffer memory, and writing the data to a recording medium such as a hard disk from the buffer memory. The present invention relates to an information recording / reproducing technique capable of seamless data recording.

  2. Description of the Related Art In recent years, hard disk devices that are integrated with a CD player are known as in-vehicle information recording / reproducing devices. In this apparatus, songs reproduced by the CD player are recorded in the hard disk in order, and thereafter, the music recorded on the hard disk side can be reproduced without having to bother inserting the CD into the CD player. . As a type of CD to be inserted into the CD player, a CD-DA in which music is recorded in a digital audio format or a disc in which music is recorded in a compression format such as MP3 is used.

  In an in-vehicle device or a device that is assumed to be portable, it is inevitable that vibration is applied during data reproduction. For this reason, the CD player as a playback apparatus is provided with vibration absorbing means, and even if the pickup is deviated from a specified location due to vibration, information for a time required for returning to the original position from the deviation is obtained. Signal processing such as using a prefetch buffer is performed. In general, reproduction data from a CD player is temporarily stored in a buffer memory, this data is sequentially read out in accordance with the reproduction speed, converted by a digital / analog converter, and output as analog sound. However, the influence of vibration is great, and if the buffer memory remains empty, the reproduced sound is interrupted and a reproduction error called skipping occurs.

  By the way, in the case of recording audio data from the CD player to the hard disk in the hard disk device integrally provided with the CD player, first, the data is temporarily stored in the buffer memory, and this is written and recorded in the hard disk. . For this reason, if the buffer memory becomes empty due to the influence of vibration and the writing process to the hard disk continues as it is, this part is written to the hard disk as a silent part without data. Therefore, when data on the hard disk is reproduced, it is reproduced as a silent part, and the user feels uncomfortable in hearing each time data is reproduced on the hard disk. Such a recording error due to vibration is not limited to a hard disk device provided with a CD player, but has been a common problem in information recording / reproducing apparatuses having a structure in which a recording medium rotating at high speed is accessed by a movable head.

Therefore, a technique has been proposed that can record data continuously without omission even when vibration occurs. For example, the technology described in Patent Document 1 temporarily stops writing data when vibration is detected, and after the cause of the error is eliminated, such as when the vibration of the car body has subsided, writes again from the data at the time when the work was stopped It is what you do.
JP-A-6-20377

  However, in the above-described conventional information recording / reproducing technology, data writing to the recording medium is stopped every time vibration is detected. In particular, in the in-vehicle device field where vibration is constantly applied during traveling, the cycle of stopping and restarting data writing tends to be shortened. For this reason, the recording operation is frequently interrupted, and the time required for the recording operation is prolonged. Further, as a result of giving priority to the continuity of the data writing process, the data reproducing process becomes intermittent, and it is difficult to ensure an excellent feeling of use such as recording on the hard disk while listening to the CD smoothly.

  The present invention has been proposed in view of the above circumstances, and an object of the present invention is to provide an information recording / reproducing apparatus capable of recording data onto a recording medium quickly and seamlessly while simultaneously reproducing data. It is to provide a method and a program.

  In order to achieve the above object, a first aspect of the present invention provides a buffer memory capable of temporarily storing data, a recording medium capable of writing data stored in the buffer memory, and data storage in the buffer memory. And an information recording / reproducing apparatus comprising a recording control means for controlling data writing to the recording medium and a reproduction control means for controlling reproduction of the data, a vibration monitoring means for monitoring vibration, and a buffer memory Buffer memory monitoring means for monitoring the amount of data stored, and the recording control means stops data storage in the buffer memory when the vibration monitoring means senses the occurrence of vibration, and the vibration monitoring means vibrates. When the stop of the data is detected, data accumulation in the buffer memory is resumed, and the data accumulation amount in the buffer memory is preset. When the buffer memory monitoring means senses that the set data remaining amount is less than the remaining set data amount, the buffer memory stops writing data to the recording medium, and the buffer memory indicates that the accumulated data amount exceeds the set data remaining amount. When the monitoring means senses, the data writing to the recording medium is resumed while matching the data when the writing is stopped.

  According to a second aspect of the present invention, there is provided an information recording / reproducing method comprising the steps of temporarily storing data in a buffer memory, writing data stored in the buffer memory to a recording medium, and reproducing the data. A vibration monitoring step for monitoring vibration, a buffer memory monitoring step for monitoring the amount of data stored in the buffer memory, a storage stop step for stopping data storage in the buffer memory when the occurrence of vibration is detected, and the buffer A write stop step for stopping data writing to the recording medium when the amount of data stored in the memory is less than a preset set data remaining amount, and storage of data in the buffer memory when vibration stop is detected Storage restart step for resuming and the amount of data stored in the buffer memory Characterized in that it comprises a resuming writing resumes step writing data to the recording medium while coincide with the write stop data when exceeding the set amount of remaining data.

  According to a third aspect of the present invention, there is provided an information recording / reproducing method for temporarily storing data in a buffer memory by using a computer, writing the data stored in the buffer memory to a recording medium, and reproducing the data. In the program, a vibration monitoring function for monitoring vibration, a buffer memory monitoring function for monitoring the amount of data stored in the buffer memory, a storage stop function for stopping data storage in the buffer memory when the occurrence of vibration is detected, A write stop function for stopping data writing to the recording medium when the data storage amount of the buffer memory is smaller than a preset set data remaining amount, and data to the buffer memory when a vibration stop is detected. A storage restart function for restarting the storage of data, and when the amount of stored data exceeds the remaining set data And resuming writing restart function to write data to the recording medium while consistent with observed time of stopping data, characterized in that to realize the computer.

  In the first, second, and third aspects of the present invention, when the occurrence of vibration is sensed, data storage in the buffer memory is immediately stopped. However, while the amount of data stored in the buffer memory is larger than the preset remaining data amount, the data writing process to the recording medium is continued.

  If data writing from the buffer memory to the recording medium is continued while data accumulation in the buffer memory is stopped, the data accumulation amount will decrease, but this will be monitored and the data accumulation amount will be less than the preset remaining data amount. Stop writing data to the recording medium when the number is low. For example, when the preset remaining data amount is zero, data writing to the recording medium is stopped in a state where the data in the buffer memory is empty. Thereby, when there is no data in the buffer memory, the data writing process to the recording medium is not performed, and it is possible to avoid recording the portion where no data exists on the recording medium side.

  Further, when it is sensed that the vibration has stopped, data accumulation in the buffer memory is resumed. At this time, if the time during which the occurrence of vibration is sensed is short, the amount of data stored in the buffer memory does not interrupt the remaining set data, and data writing to the recording medium is continuously executed without interruption. The As described above, when the remaining set data is zero, data writing to the recording medium is stopped when the data in the buffer memory is empty, as long as the data is accumulated in the buffer memory. Is nothing but to continue the writing process on the recording medium side. That is, if the capacity of the buffer memory is sufficiently secured and the remaining set data is kept low, even if the vibration time is long, the writing process to the recording medium is not interrupted. Even when data writing to the recording medium is stopped, data storage in the buffer memory is resumed as soon as the stop of vibration is detected, so the data storage amount in the buffer memory exceeds the set data remaining amount in a short time. It is possible to restart the data writing process to the recording medium quickly.

  According to the information recording / reproducing apparatus, method and program of the present invention as described above, even if vibration is detected, the recording medium can be used as long as the amount of data stored in the buffer memory is larger than the set remaining data amount. By continuing the data writing process, it is possible to avoid interruption of the data writing process and realize a smooth data reproduction process and a quick data recording process. Then, the writing process to the recording medium is stopped only when the amount of data in the buffer memory becomes smaller than the set data remaining amount, thereby enabling continuous data recording on the recording medium. Therefore, even when data on the recording medium is reproduced, the user can obtain an excellent feeling of use without feeling uncomfortable.

  Next, the best mode for carrying out the present invention (hereinafter referred to as “embodiment”) will be specifically described with reference to the drawings. In addition, although this embodiment is implement | achieved by controlling the computer provided with the peripheral device by a program, the implementation | achievement aspect of the hardware and program in this case can be variously changed. In addition to the information recording / reproducing apparatus and method, the present invention can be grasped as a program itself or a computer-readable recording medium recording the program. Therefore, it demonstrates using a virtual functional block diagram as what implement | achieves each function of this invention and this embodiment.

[1. Configuration]
The present embodiment is applied to an in-vehicle hard disk navigation device 1. This apparatus records audio data reproduced by the CD player 2 in the hard disk 7, and reproduces the audio data recorded on the hard disk 7, and includes the elements shown in the functional block diagram of FIG. Yes.

  That is, a music player CD player 2 is integrally installed. A mechanism unit 4 including a pickup, a servo motor, and the like, and a reproduction control unit 5 for controlling the mechanism unit 4 are provided. . The reproduction control unit 5 amplifies the audio data read from the CD and outputs it to the speaker 6 and outputs the data to the recording device 3 side.

  On the recording device 3 side, a hard disk 7, a recording control unit 8, and a buffer memory 9 are provided. The hard disk 7 is a recording medium in which audio data reproduced by the CD player 2 can be written and data can be rewritten. The hard disk 7 stores a navigation program and road map data including various kinds of point information, and a recording area for recording audio data from the CD player 2 is formed. The buffer memory 9 is a DRAM capable of temporarily storing data, and the stored data is written on the hard disk 7 side.

  The recording control unit 8 includes a memory controller 8a that controls reading and writing of data to and from the hard disk 7 and the buffer memory 9, an encoder unit 8b that compresses data input from the CD player 2 side into data for recording on the hard disk 7, and a hard disk 7 has a decoder unit 8c for expanding the data read out from 7, and outputs the expanded data to the speaker 6.

  The memory controller 8a of the data recording control unit 8 is provided with a vibration monitoring unit 11 and a buffer memory monitoring unit 12 as main components of this embodiment. The vibration monitoring unit 11 receives a tracking error signal and a focus error signal obtained from the reproduction control unit 5 of the CD player 2 and detects an interruption of audio data from the CD player 2. That is, the presence / absence of vibration is determined based on a focus error signal that detects a drop in focus on the CD recording surface of the pickup and a tracking error signal that detects that the pickup does not follow the CD recording surface. Yes. When the vibration monitoring unit 11 senses the occurrence of vibration, it outputs a data accumulation stop command to stop data accumulation in the buffer memory 9 to the memory controller 8a of the data recording control unit 8, and when it senses the vibration stop. Similarly, a data storage restart command for restarting data storage in the buffer memory 9 is output to the memory controller 8a.

  The buffer memory monitoring unit 12 is connected to the buffer memory 9 and is configured to monitor the amount of data stored in the buffer memory 9 and output the following command to the memory controller 8a. When it is sensed that a certain amount of data has been stored in the buffer memory 9, a data write start command to the hard disk 7 is output. When it is detected that the data stored in the buffer memory 9 is empty, a data write stop command to the hard disk 7 is output. In other words, in the present embodiment, the setting is made so that data writing to the hard disk 7 is stopped when the remaining amount of data in the buffer memory 9 becomes zero.

  Furthermore, when the buffer memory monitoring unit 12 senses that data starts to be stored again in the buffer memory 9 and accumulates a predetermined amount or more, it outputs a command to resume writing data to the hard disk 7 to the memory controller 8a. Needless to say, when resuming the data writing, the data is written after confirming the coincidence of the data at the time of the writing stop and the data at the time of the resumption. In general, the data recording speed for the buffer memory 9 is much faster than the data writing speed for the hard disk 7. For this reason, it is possible to start writing data to the hard disk 7 immediately after resuming data storage in the buffer memory 9, but in consideration of the reading speed from the CD player 2, a certain amount of data is used here. Is stored in the buffer memory 9 by the buffer memory monitoring unit 12 and then writing to the hard disk 7 is resumed.

[2. Action]
In the present embodiment, the flow of recording audio data from the CD player 2 on the hard disk 7 side will be described with reference to the flowchart of FIG.

  When a user operates a “record” key (not shown) that is an audio operation key to start recording processing such as starting recording of all songs or recording of a desired song, the data for the specified CD or song is recorded. Access is started (step 1), and data input to the recording control unit 8 via the reproduction control unit 5 is temporarily stored in the buffer memory 9 (step 2).

  When a certain amount of data is accumulated in the buffer memory 9, the buffer memory monitoring unit 12 that has been monitoring this outputs a data write start command to the hard disk 7 to the memory controller 8a, and the memory controller 8a accordingly Data writing to the hard disk 7 is started (step 3). In this case, a predetermined compression format is selected according to the data format input from the reproduction control unit 5, and data compressed by the encoder unit 8 b is recorded on the hard disk 7. If all the data sent from the reproduction control unit 5 has been recorded on the hard disk 7 (YES in step 4), the recording process ends.

  On the other hand, if vibration occurs during the recording process (NO in step 4) (YES in step 5), accumulation of data in the buffer memory 9 is stopped (step 6). In this case, the occurrence of vibration is determined by the vibration monitoring unit 11 detecting the focus error signal and tracking error signal sent from the reproduction control unit 5. That is, when the vibration monitoring unit 11 senses the occurrence of vibration, it outputs a data storage stop command to the memory controller 8a, and the memory controller 8a stops data storage in the buffer memory 9 accordingly.

  Even if the accumulation of data in the buffer memory 9 is stopped, if the data in the buffer memory 9 is not empty (NO in step 7), the process returns to step 3 to transfer the data in the buffer memory 9 to the hard disk 7. Continue writing. On the other hand, when the buffer memory monitoring unit 12 senses that the data stored in the buffer memory 9 is empty, the memory controller 8a determines that the hard disk 7 is based on the data write stop command from the buffer memory monitoring unit 12. (Step 8), the operation returns to step 5 and continues until the vibration is stopped.

  When the vibration monitoring unit 11 senses that the vibration has stopped (NO in step 5), the accumulation of data in the buffer memory 9 is resumed (step 9). That is, when the vibration monitoring unit 11 senses the stop of vibration, it outputs a data storage restart command to the memory controller 8a, and the memory controller 8a restarts data storage in the buffer memory 9 accordingly.

  Then, when the buffer memory monitoring unit 12 senses that the data starts to be accumulated again in the buffer memory 9 and more than a predetermined amount of data has been accumulated, it outputs an instruction to resume writing data to the hard disk 7 to the memory controller 8a. The memory controller 8a starts writing data to the hard disk 7 while making it coincide with the data at the time of writing stop (step 3).

[3. Effect]
According to the present embodiment as described above, while data remains in the buffer memory 9, data writing to the hard disk 7 can be continued even if the vibration monitoring unit 11 detects vibration. For this reason, even in an in-vehicle device that is constantly vibrated, the data writing process is not frequently interrupted, and the audio data from the CD player 2 can be reproduced smoothly and the recording process can be performed quickly. In addition, when the remaining amount of data in the buffer memory 9 is exhausted, the writing process to the hard disk 7 is stopped, thereby enabling continuous data recording. Therefore, when the data on the hard disk 7 is reproduced, an excellent feeling of use can be obtained without the user feeling uncomfortable.

[4. Other Embodiments]
The present invention is not limited to the above embodiment, and the recording medium used in the present invention includes not only a hard disk but also a large-capacity semiconductor memory, and the recording formats include mp3, wma, avi, Various formats such as mpeg1, mpeg2, mpeg4 and DV can be adopted. Further, the capacity of the hard disk or the buffer memory can be freely selected, and the remaining set data as a reference when stopping data writing may be variable. Furthermore, each component means can be changed as appropriate. For example, a vibration sensor may be independently installed as a vibration monitoring means. The present invention is suitable for a vehicle-mounted device that often receives vibrations, but is not limited to this and can be widely applied to home and portable information recording / reproducing devices.

The functional block diagram which shows the structure of embodiment of this invention. The flowchart which shows the process sequence in embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Hard disk navigation apparatus 2 ... CD player 3 ... Recording apparatus 4 ... Mechanism part 5 ... Playback control part 6 ... Speaker 7 ... Hard disk 8 ... Recording control part 8a ... Memory controller 8b ... Encoder part 8c ... Decoder part 9 ... Buffer memory 11 ... Vibration monitoring unit 12 ... Buffer memory monitoring unit

Claims (3)

A buffer memory capable of temporarily storing data, a recording medium capable of writing data stored in the buffer memory, and a recording control means for controlling data storage in the buffer memory and data writing to the recording medium; In an information recording / reproducing apparatus comprising a reproduction control means for controlling reproduction of the data,
Vibration monitoring means for monitoring vibration;
Buffer memory monitoring means for monitoring the amount of data stored in the buffer memory, and
The recording control means stops data accumulation in the buffer memory when the vibration monitoring means senses occurrence of vibration, and resumes data accumulation in the buffer memory when the vibration monitoring means senses stop of vibration. When the buffer memory monitoring means senses that the data storage amount of the buffer memory is less than a preset set data remaining amount, data writing to the recording medium is stopped, and the data storage amount An information recording / reproducing apparatus configured to resume data writing to the recording medium while matching the data when writing is stopped when the buffer memory monitoring means senses that the remaining set data has been exceeded . In an information recording / reproducing method comprising the steps of temporarily accumulating data in a buffer memory, writing the data accumulated in the buffer memory to a recording medium, and reproducing the data,
A vibration monitoring step for monitoring vibration;
A buffer memory monitoring step for monitoring the amount of data stored in the buffer memory;
An accumulation stop step of stopping data accumulation in the buffer memory when the occurrence of vibration is detected;
A write stop step of stopping data writing to the recording medium when the amount of data stored in the buffer memory is less than a preset set data remaining amount;
An accumulation resuming step of resuming accumulation of data in the buffer memory when a stop of vibration is detected;
An information recording / reproducing method comprising: a resuming step of resuming data writing to the recording medium while matching the data when writing is stopped when the amount of accumulated data exceeds the remaining set data amount. In an information recording / reproducing program for temporarily storing data in a buffer memory using a computer, writing the data stored in the buffer memory to a recording medium, and reproducing the data,
A vibration monitoring function for monitoring vibration;
A buffer memory monitoring function for monitoring the amount of data stored in the buffer memory;
An accumulation stop function for stopping data accumulation in the buffer memory when the occurrence of vibration is detected;
A write stop function for stopping data writing to the recording medium when the amount of data stored in the buffer memory is less than a preset set data remaining amount;
An accumulation restart function for resuming the accumulation of data in the buffer memory when a vibration stop is detected;
A write resuming function for resuming data writing to the recording medium while matching the data at the time of writing stop when the data accumulation amount exceeds the set data remaining amount,
An information recording / reproducing program which is realized by a computer.

Images