JP2006286185A - Information reproducing device, system, host, and information reproducing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an information reproducing method that performs reading at the optimum reproducing speed in reproducing AV data, reduces noises and power consumption by vibration resulting from high-speed rotation, and performs reading at the maximum speed in reading ordinary data. <P>SOLUTION: Since a transfer rate of data readout is determined according to a form of a reading request from users, a rotational speed of an information medium is determined according to a data transfer rate meeting the form of the reading request by the users. For example, when the data transfer rate is lower than a threshold, as in reproducing the AV data (Y of S3, S4), the reading at excessive high speed is avoided and the noises and power consumption resulting from high-speed rotation is reduced by lowering the rotational speed of the information medium (S6). On the other hand, since the transfer rate is larger than the threshold (N of S4), in data reading in a form of ripping, etc, even in the same AV data file, the reading at the maximum speed is made as well by keeping the rotational speed of the information medium at the upper limit. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an information reproducing method and an information reproducing apparatus for reproducing AV data recorded on an information medium such as a CD-ROM disc, a CD-R disc, and a CD-RW disc in general.

  In an information reproducing apparatus for reading information from a rotationally driven information medium such as a CD-ROM disc, a CD-R disc, a CD-RW disc, etc., the reading speed is increased, but the noise due to the high-speed rotation of the disc. And the problem of increased power consumption.

  For example, a music CD (CD-DA), a video CD, or a WAV file recorded on a CD (a file with the extension wav, which is the most basic audio file format handled by Windows (registered trademark), which is Microsoft's OS) When reproducing AV data such as MP3 files (abbreviation of MPEG Audio Layer-3 ... a file with an extension of mp3 in the standard name of audio compression technology) using a USB speaker mounted on a computer, the data can be read at high speed. The more the noise and power consumption due to rotational vibration become more serious.

In addition, the higher the rotational speed of the disk, the higher the possibility that data is erroneously read due to scratches or dust on the disk. In addition, several techniques for this have been proposed (see, for example, Patent Document 1).
JP 2000-132901 A

  However, in general, the average transfer rate when reproducing AV data such as music data, video data, WAV data, etc. recorded on the disc is about 1 × speed, and MP3 data is about 1/10 of the normal data. It is sufficiently slow compared to reading, and there is no need to rotate the disk at high speed.

  In order to deal with such a problem, for example, in the case of reading data without an error correction mechanism such as a music CD or some video CDs, there has been proposed an information reproducing apparatus that reads at a predetermined reproduction speed. Yes. However, if the reading speed is unconditionally decelerated during the reproduction of a music CD or video CD as described above, it cannot be read at a high speed in data sucking or the like that requires high-speed reading. Further, since an error correction mechanism is added to the data of WAV data, MP3 data, etc., the information reproducing apparatus of the above proposed example is a target of high-speed reading, and is read at a predetermined reproduction speed. I can't.

  According to Patent Document 1, a disk device that controls the reading speed is proposed. In this example, the disk rotation speed according to the transfer speed of the file to be read, specifically, the type of data to be read (file type, file size, etc.) is analyzed to determine the optimum read speed. It is. This eliminates the need to always read at the maximum speed, which is preferable in terms of the total reading speed, vibration / noise, and power consumption.

  However, even in the case of this publication, since the rotation speed = reading speed is automatically determined depending on the type of data to be read (file type, file size, etc.), the same file is tried to be read in a different manner. It is something that cannot be dealt with. For example, when the same WAV file is read, there is a problem that it is impossible to cope with a difference in a read request mode requested by a user (WAV reproduction, data sucking = ripping difference, etc.).

  Therefore, the present invention reads out various AV data at an optimum playback speed, reduces noise and power consumption due to vibrations of high-speed rotation of the disk, and performs normal data reading that requires high-speed reading. An object of the present invention is to provide an information reproducing method and an information reproducing apparatus capable of performing reading at the highest speed.

  A first aspect of the present invention is an information reproducing method for reading information from a rotationally driven information medium to a host via a cache memory, according to a transfer rate of data transferred from the cache memory to the host The rotational speed of the information medium is determined.

  The data read transfer rate is determined according to the mode of the read request from the user. The data reading speed is defined by the rotation speed of the information medium. The higher the speed, the faster the reading speed, and the lower the speed, the slower the reading speed. Therefore, by determining the rotation speed of the information medium according to the data transfer rate according to the mode of the read request by the user, for example, when the data transfer rate may be low, such as when reproducing AV data, By reducing the rotation speed, it is possible to avoid reading at a higher speed than necessary, and to reduce noise and power consumption due to the high speed rotation. On the other hand, even when the same AV data file is read out in the form of ripping or the like, it is possible to read out at the highest speed by increasing the rotation speed of the information medium to the upper limit.

  According to a second aspect of the present invention, there is provided an information reproducing method for reading information from a rotationally driven information medium to a host via a cache memory, and transferring data transferred from the cache memory for data reading to the host When the rate is less than a certain threshold value, the information medium is read at a reduced rotational speed of the information medium.

  Therefore, this is basically the same as in the case of claim 1, but particularly in the case of a read request mode for reproducing AV data such as a music CD, the data read transfer rate is higher than that of normal data read. Therefore, it is possible to cope with the reproduction of AV data such as a music CD by measuring the transfer rate and lowering the rotation speed of the information medium when it is below a predetermined threshold value. .

  According to a third aspect of the present invention, there is provided an information reproducing method for reading information from a rotationally driven information medium to a host via a cache memory, and transferring data transferred from the cache memory for data reading to the host When the rate exceeds a certain threshold value, information is read by increasing the rotation speed of the information medium.

  Therefore, this is basically the same as in the case of claim 1, but particularly in the case of a read request mode in which even an information medium on which AV data such as a music CD is recorded is read out. Since a high speed is required as a transfer rate for reading data, the transfer rate is measured, and when a predetermined threshold value is exceeded, the rotation speed of the information medium is increased to an upper limit value, for example. Thus, data can be read out at high speed.

  According to a fourth aspect of the present invention, there is provided an information reproducing method for reading information from a rotationally driven information medium to a host via a cache memory, and transferring data transferred from the cache memory for data reading to the host When the rate is below a certain threshold value, the information medium is read at a lower rotational speed, and when the transfer rate exceeds a certain threshold value, the information medium is increased at the rotational speed. Was read out.

  Therefore, for example, with respect to the same information medium on which AV data is recorded, there may be a case where the user alternately requests AV data reproduction and AV data extraction, but it is always performed while data is being read. By measuring the transfer rate and switching the rotation speed of the information medium between the low speed side and the high speed side with the threshold as the boundary, it is possible to rotate at a low speed during reproduction and at a high speed during data extraction. The problem of noise and data reading errors can be suppressed during data reproduction, and the data can be processed at high speed during data extraction.

  According to a fifth aspect of the present invention, in the information reproducing method according to any one of the second to fourth aspects, the presence or absence of a read request issued by a user is monitored, and the read request is measured during measurement of a data read transfer rate. When issuance has not been made for a certain period of time, the data read transfer rate is measured again.

  The transfer rate is measured without distinguishing between an AV data file and a normal data file. In order to realize the information reproducing method according to any one of claims 2 to 4, a normal data file is read. To avoid shifting the playback speed to a low speed or shifting to the fastest speed during AV data playback and interrupting the sound or stopping the video, do not mistakenly measure the data read transfer rate. There is a need to. For example, in a normal data file read, when data read is resumed after a read request from a user is temporarily interrupted, the transfer rate tends to be measured lower than the actual rate. In this regard, when reproducing AV data, generally, a read request from a user tends to be issued periodically, and this can be one material for determining whether or not AV data is being reproduced. Considering these points, when the transfer rate is measured, if the read request is not issued for a certain period of time, it is considered that the data file is likely to be read, and the transfer rate is measured again. By doing so, it is possible to avoid reading out a normal data file at a low speed, or shifting the sound at the highest speed during AV data reproduction to interrupt the sound or stop the video. That is, it is possible to properly distinguish between reproduction of the AV data file and reading of the normal data file.

  According to a sixth aspect of the present invention, in the information reproducing method according to any one of the second to fourth aspects, a read address in a read request from a user is monitored, and the read request is received during measurement of a data read transfer rate. When the read addresses were not in ascending order, the data transfer rate was measured again.

  The transfer rate is measured without distinguishing between an AV data file and a normal data file. In order to realize the information reproducing method according to any one of claims 2 to 4, a normal data file is read. To avoid shifting the playback speed to a low speed or shifting to the fastest speed during AV data playback and interrupting the sound or stopping the video, do not mistakenly measure the data read transfer rate. There is a need to. For example, in a normal data file read, when data read is resumed after a read request from a user is temporarily interrupted, the transfer rate tends to be measured lower than the actual rate. In this regard, at the time of AV data reproduction, since the read addresses in the read request from the user are generally in ascending order, this can be one material for determining whether or not the AV data is being reproduced. Considering these points, if the read address is not in ascending order in the transfer rate measurement, it is considered that there is a high possibility of reading the data file, and the transfer rate is measured again. It is possible to avoid normal data file reading at a low speed, or shifting to the fastest speed during AV data reproduction to interrupt sound or stop video. That is, it is possible to properly distinguish between reproduction of the AV data file and reading of the normal data file.

  According to a seventh aspect of the present invention, in the information reproduction method according to any one of the second to fourth aspects, the effectiveness is determined by measuring a plurality of transfer rates as one set, and a plurality of times within one set. When the transfer rate measurement result is the same transfer rate, the transfer rate is enabled.

  For example, when a user skips playback while playing back AV data by reading at low speed, the skip is read from the information medium at once, and the data is stored in the host-side buffer memory serving as the transfer destination. There are applications to do so. When such an application is used, the transfer rate temporarily increases. Therefore, when the information reproducing method according to any one of claims 2 to 4 is realized, the rotation speed of the information medium is minimized. As a result, the AV data may be interrupted or the video screen may stop. In this regard, the effectiveness of the multiple transfer rate measurement is determined as one set, and the transfer rate is valid if the multiple transfer rate measurement results in the set are the same transfer rate. As a result, it is possible to improve the reliability of the transfer rate obtained by assuming that the same value is returned at multiple transfer rates as the effective transfer rate value. Can deal with.

  The invention according to claim 8 is the information reproducing method according to claim 4, wherein the threshold value for increasing the rotation speed of the information medium is larger than the threshold value for decreasing the rotation speed of the information medium. It is.

  5. The information reproducing method according to claim 4, wherein when the data transfer rate requested by the user is near a threshold value for switching the rotation speed of the information medium, a slight change in the data transfer rate causes the information medium to be read during data reading. There is a possibility that the rotation speed is repeatedly reduced and increased. In this respect, when the threshold value for increasing the rotation speed of the information medium is set larger than the threshold value for decreasing the rotation speed of the information medium, reading at a transfer rate near the threshold value is performed. The problem of repeatedly decelerating and increasing the rotational speed of the information medium can be avoided.

  The invention according to claim 9 uses a cache memory that temporarily stores information read from the information medium before transferring it, and if the cache memory has free space after a read request by a user, data is pre-read. 9. The information reproducing method according to claim 2, wherein when the information is read from the information medium at the highest speed, the cache memory becomes full and the data destination is read. When reading is completed, measurement of transfer rate is started.

  9. The information reproducing method according to claim 2, wherein when data is read from the information medium at the highest speed, measuring the transfer rate decreases the data reading performance. However, when the information is read from the information medium at the highest speed, the fact that the cache memory is full means that the read from the user is slower than the read speed of the drive. By starting the transfer rate measurement when the memory is full and pre-reading of the data is completed, the transfer rate is not measured unnecessarily during the reading process at the maximum speed, and the performance of the reading process is improved. Decline can be prevented. On the other hand, at the time of AV data reproduction or the like, the transfer rate is slow and the cache memory is full and the pre-reading is completed, so the measurement of the transfer rate can be started as it is.

  According to a tenth aspect of the present invention, there is provided a motor that rotates an information medium and an optical pickup that reads information on the information medium, and reads information from the rotationally driven information medium to a host via a cache memory. In the reproducing apparatus, the rotation speed of the information medium by the motor is determined in accordance with a transfer rate of data transferred from the cache memory to the host.

  The data read transfer rate is determined according to the mode of the read request from the user. The data reading speed is defined by the rotation speed of the information medium. The higher the speed, the faster the reading speed, and the lower the speed, the slower the reading speed. Therefore, by determining the rotation speed of the information medium according to the data transfer rate according to the mode of the read request by the user, for example, when the data transfer rate may be low, such as when reproducing AV data, By reducing the rotation speed, it is possible to avoid reading at a higher speed than necessary, and to reduce noise and power consumption due to the high speed rotation. On the other hand, even when the same AV data file is read out in the form of ripping or the like, the highest speed is used to maximize the performance of the information reproducing apparatus by increasing the rotation speed of the information medium to the upper limit. It is also possible to perform reading with.

  According to an eleventh aspect of the present invention, there is provided a motor that rotates an information medium and an optical pickup that reads information on the information medium, and reads information from the rotationally driven information medium to a host via a cache memory. Comparing means for comparing the transfer rate of data transferred from the cache memory for data reading to the host with a certain threshold value, and the measured transfer rate as a result of comparison by the comparing means. Rotational speed control means for controlling the motor to reduce the rotational speed of the information medium when the motor is below a certain threshold value.

  Therefore, this is basically the same as in the case of claim 10, but particularly in the case of a read request mode for reproducing AV data such as a music CD, the data read transfer rate is higher than that of normal data read. The transfer rate is measured by the measuring means, and if the result of the comparison by the comparing means is less than a predetermined threshold value, the rotation speed control means determines the rotation speed of the information medium. By lowering, it is possible to cope with the reproduction of AV data such as a music CD.

  According to a twelfth aspect of the present invention, there is provided a motor that rotates an information medium and an optical pickup that reads information on the information medium, and reads information from the rotationally driven information medium to a host via a cache memory. Comparing means for comparing the transfer rate of data transferred from the cache memory for data reading to the host with a certain threshold value, and the measured transfer rate as a result of comparison by the comparing means. Rotation speed control means for controlling the motor to increase the rotation speed of the information medium when a certain threshold value is exceeded.

  Therefore, this is basically the same as in the case of claim 10, but particularly in the case of a read request mode in which even an information medium on which AV data such as a music CD is recorded is read out. Since a high speed is required as a transfer rate for data reading, the transfer rate is measured by the measuring unit, and if the comparison unit compares the result of the comparison, the rotation speed is exceeded. By increasing the rotation speed of the information medium to, for example, an upper limit value by the control means, the data can be read out at a high speed in order to make the best use of the performance of the information reproducing apparatus.

  According to a thirteenth aspect of the present invention, there is provided a motor that rotates an information medium and an optical pickup that reads information on the information medium, and reads information from the rotationally driven information medium to a host via a cache memory. A reproducing device, a measuring means for constantly measuring a transfer rate of data transferred from the cache memory for reading data to the host, a comparing means for comparing the measured transfer rate with a certain threshold, As a result of comparison by the comparison means, if the measured transfer rate is less than a certain threshold value, the motor is controlled to reduce the rotation speed of the information medium, and the measured transfer rate exceeds a certain threshold value. In some cases, a rotation speed control means for controlling the motor to increase the rotation speed of the information medium is provided.

  Therefore, for example, with respect to the same information medium on which AV data is recorded, there may be a case where the user alternately requests playback of AV data and suction of AV data, but measurement is performed while data is being read. The transfer rate is always measured by the means, and as a result of the comparison by the comparison means, the rotation speed of the information medium is controlled to be switched between the low speed side and the high speed side by the rotation speed control means with the threshold as a boundary. It can be rotated at high speed during rotation and data extraction, so noise and data reading errors can be suppressed during AV data reproduction, and processing is performed at high speed to maximize the performance of the information reproduction apparatus during data extraction. Can be made.

  According to a fourteenth aspect of the present invention, in the information reproducing apparatus according to any one of the eleventh to thirteenth aspects, a monitoring unit that monitors whether or not a read request is issued from a user over a certain period of time, and monitoring by the monitoring unit As a result, a re-measurement unit is provided for re-measuring the data reading transfer rate when the reading request is not issued for a predetermined time or longer during the measurement of the data reading transfer rate.

  The transfer rate is measured without distinguishing between an AV data file and a normal data file, and when the information reproducing apparatus according to any one of claims 11 to 13 is realized, the normal data file is read. To avoid shifting the playback speed to a low speed or shifting to the fastest speed during AV data playback and interrupting the sound or stopping the video, do not mistakenly measure the data read transfer rate. There is a need to. For example, in a normal data file read, when data read is resumed after a read request from a user is temporarily interrupted, the transfer rate tends to be measured lower than the actual rate. In this regard, when reproducing AV data, generally, a read request from a user tends to be issued periodically, and this can be one material for determining whether or not AV data is being reproduced. Considering these points, when the transfer rate is measured, if the read request is not issued for a certain period of time, it is considered that the data file is likely to be read, and the transfer rate is measured again. By doing so, it is possible to avoid reading out a normal data file at a low speed, or shifting the sound at the highest speed during AV data reproduction to interrupt the sound or stop the video. That is, it is possible to properly distinguish between reproduction of the AV data file and reading of the normal data file.

  According to a fifteenth aspect of the present invention, in the information reproducing apparatus according to any one of the eleventh to thirteenth aspects, the address monitoring means for monitoring whether or not the read address in the read request from the user is in ascending order, and the address Re-measuring means for re-measuring the data reading transfer rate when the reading addresses requested to be read are not in ascending order during the data reading transfer rate measurement as a result of monitoring by the monitoring means.

  The transfer rate is measured without distinguishing between an AV data file and a normal data file, and when the information reproducing apparatus according to any one of claims 11 to 13 is realized, the normal data file is read. To avoid shifting the playback speed to a low speed or shifting to the fastest speed during AV data playback and interrupting the sound or stopping the video, do not mistakenly measure the data read transfer rate. There is a need to. For example, in a normal data file read, when data read is resumed after a read request from a user is temporarily interrupted, the transfer rate tends to be measured lower than the actual rate. In this regard, at the time of AV data reproduction, since the read addresses in the read request from the user are generally in ascending order, this can be one material for determining whether or not the AV data is being reproduced. Considering these points, if the read address is not in ascending order in the transfer rate measurement, it is considered that there is a high possibility of reading the data file, and the transfer rate is measured again. It is possible to avoid normal data file reading at a low speed, or shifting to the fastest speed during AV data reproduction to interrupt sound or stop video. That is, it is possible to properly distinguish between reproduction of the AV data file and reading of the normal data file.

  According to a sixteenth aspect of the present invention, in the information reproducing apparatus according to any one of the eleventh to thirteenth aspects, the measuring means determines the effectiveness of a plurality of transfer rate measurements as one set, and determines the effectiveness of one set. When the transfer rate measurement results for multiple times are similar, the transfer rate is validated.

  For example, when a user skips playback while playing back AV data by reading at low speed, the skip is read from the information medium at once, and the data is stored in the host-side buffer memory serving as the transfer destination. There are applications to do so. When such an application is used, the transfer rate temporarily increases. Therefore, when the information reproducing apparatus according to any one of claims 11 to 13 is realized, the rotation speed of the information medium is minimized. As a result, the AV data may be interrupted or the video screen may stop. In this regard, the effectiveness of the multiple transfer rate measurement is determined as one set, and the transfer rate is valid if the multiple transfer rate measurement results in the set are the same transfer rate. As a result, it is possible to improve the reliability of the transfer rate obtained by assuming that the same value is returned at multiple transfer rates as the effective transfer rate value. Can handle rate changes.

  According to a seventeenth aspect of the present invention, in the information reproducing apparatus according to the thirteenth aspect, the comparison means has a threshold value for increasing the rotation speed of the information medium from a threshold value for decreasing the rotation speed of the information medium. Is set to a larger value.

  14. The information reproducing apparatus according to claim 13, wherein when the data transfer rate requested by the user is near a threshold for switching the rotation speed of the information medium, a slight change in the data transfer rate causes the information medium to be read during data reading. There is a possibility that the rotation speed is repeatedly reduced and increased. In this respect, when the threshold value for increasing the rotation speed of the information medium is set larger than the threshold value for decreasing the rotation speed of the information medium, reading at a transfer rate near the threshold value is performed. The problem of repeatedly decelerating and increasing the rotational speed of the information medium can be avoided.

  The invention according to claim 18 is provided with a cache memory for temporarily storing information read from the information medium before the transfer, and when there is free space in the cache memory even after a read request by a user, the data is pre-read. 18. The information reproducing apparatus according to claim 11, wherein the measuring unit is configured to read the information from the information medium at a maximum speed when the cache memory is full. At this point, the transfer rate measurement is started when the data pre-reading is completed.

  18. In realizing the information reproducing apparatus according to claim 11, when data is read from an information medium at the highest speed, measuring the transfer rate decreases data reading performance. However, when the information is read from the information medium at the highest speed, the fact that the cache memory is full means that the read from the user is slower than the read speed of the drive. By starting the transfer rate measurement when the memory is full and pre-reading of the data is completed, the transfer rate is not measured unnecessarily during the reading process at the maximum speed, and the performance of the reading process is improved. Decline can be prevented. On the other hand, at the time of AV data reproduction or the like, the transfer rate is slow and the cache memory is full and the pre-reading is completed, so the measurement of the transfer rate can be started as it is.

  According to the first aspect of the present invention, since the transfer rate of data read is determined according to the mode of the read request from the user, the rotation speed of the information medium is determined according to the data transfer rate according to the mode of the read request by the user. Therefore, for example, when the data transfer rate may be low, such as when reproducing AV data, the rotation speed of the information medium is reduced to avoid reading at an unnecessarily high speed. For example, even when the same AV data file is read in the form of ripping or the like, the rotation speed of the information medium can be increased to the upper limit to increase the maximum speed. It is also possible to perform reading with.

  According to the second aspect of the present invention, there is provided an information reproducing method for reading information from a rotationally driven information medium to a host via a cache memory, the data being transferred from the cache memory for data reading to the host When the transfer rate is less than a certain threshold value, the information medium is read out at a lower rotational speed. This is basically the same as the case of claim 1, In the case of a read request mode for reproducing AV data such as a music CD, the transfer rate of data read is sufficiently lower than that of normal data read. Therefore, the transfer rate is measured and set in advance. When it is below the threshold value, it is possible to cope with the reproduction of AV data such as a music CD by reducing the rotation speed of the information medium.

  According to a third aspect of the present invention, there is provided an information reproducing method for reading information from a rotationally driven information medium to a host via a cache memory, wherein the data transferred from the cache memory for data reading to the host When the transfer rate exceeds a certain threshold value, information is read out by increasing the rotation speed of the information medium, so basically the same as in the case of claim 1, In particular, even in the case of a read request mode in which AV data such as a music CD is recorded, a high speed is required as a data read transfer rate. When the measured value exceeds a certain threshold value, the rotation speed of the information medium is increased to, for example, an upper limit value, so that data is read out at high speed. It can be carried out.

  According to the fourth aspect of the present invention, for example, with respect to the same information medium on which AV data is recorded, the user may alternately request the reproduction of the AV data and the suction of the AV data. While reading, the transfer rate is always measured, and the rotation speed of the information medium is switched between the low speed side and the high speed side with the threshold as the boundary, so that the low speed rotation during playback and the high speed rotation during data extraction Therefore, the problem of noise and data reading errors can be suppressed when reproducing AV data, and the data can be processed at high speed when data is extracted.

  According to the invention described in claim 5, in the information reproduction method according to any one of claims 2 to 4, when AV data is reproduced, generally, a read request from a user tends to be issued periodically. Focusing on the fact that this can be one material for determining whether or not AV data is being reproduced, monitoring whether or not a read request is issued from the user, and issuing the read request while measuring the transfer rate of data read If the data transfer rate does not come for a certain period of time, the transfer rate measurement of the data read is performed again, so that the accuracy of the transfer rate measurement can be improved, so that a normal data file is read at a low speed. In addition, it is possible to prevent the sound from being interrupted or the video from stopping due to shifting at the highest speed during AV data playback. The division of the reading of the datafile can be appropriately performed.

  According to the sixth aspect of the invention, in the information reproduction method according to any one of the second to fourth aspects, when AV data is reproduced, generally, the read addresses in the read request from the user are in ascending order. Paying attention to the point that it can be one material for determining whether or not AV data is being reproduced, the read address in the read request from the user is monitored, and the read that has been requested during the measurement of the data read transfer rate When the addresses are not in ascending order, the data transfer rate measurement is repeated, so the accuracy of the transfer rate measurement can be improved, so normal data files can be read at low speed. , It is possible to prevent the sound from being interrupted or the video from stopping due to shifting at the highest speed during AV data playback. The distinctions between the read playback and normal data files yl can be appropriately performed.

  According to a seventh aspect of the present invention, in the information reproduction method according to any one of the second to fourth aspects, the effectiveness is determined by determining the measurement of a plurality of transfer rates as one set, and the plurality of the transfer rates in one set. When the transfer rate measurement result is the same, the transfer rate is validated, so the reliability of the obtained transfer rate can be improved, and the temporary transfer rate Can cope with the changes.

  According to an eighth aspect of the present invention, in the information reproducing method according to the fourth aspect, the threshold value for increasing the rotational speed of the information medium is larger than the threshold value for decreasing the rotational speed of the information medium. Since the value is set, it is possible to avoid the problem of repeatedly decelerating and increasing the rotational speed of the information medium when reading at a transfer rate near the threshold.

  According to the ninth aspect of the present invention, the cache memory that temporarily stores the information read from the information medium is transferred, and if the cache memory has free space after the read request by the user, the data destination 9. The information reproducing method according to claim 2, wherein when the information is read from the information medium at the highest speed, the cache memory becomes full and data is read. Since the transfer rate measurement is started when the pre-reading is completed, the transfer rate is not measured unnecessarily during the reading process at the highest speed, and the performance of the reading process is prevented from deteriorating. Can do.

  According to the tenth aspect of the present invention, since the transfer rate of the data read is determined according to the mode of the read request from the user, the rotation speed of the information medium is determined according to the data transfer rate according to the mode of the read request by the user. Therefore, for example, when the data transfer rate may be low, such as when reproducing AV data, the rotation speed of the information medium is reduced to avoid reading at an unnecessarily high speed. In the case of reading data in the form of ripping or the like even for the same AV data file, for example, the information medium can be reduced by increasing the rotation speed of the information medium to the upper limit. In order to make the best use of the performance of the reproducing apparatus, it is possible to perform reading at the highest speed.

  According to the invention described in claim 11, basically the same as the case described in claim 10, but particularly in the case of a read request mode for reproducing AV data such as a music CD, data read transfer is performed. Since the rate is sufficiently low compared to normal data reading, the comparison means for comparing the transfer rate of data transferred from the data read cache memory to the host with a certain threshold value, and the result of comparison by this comparison means When the measured transfer rate is less than a certain threshold value, the rotation speed of the information medium is lowered by the rotation speed control means, so that it is possible to cope with the reproduction of AV data such as a music CD.

  According to the twelfth aspect of the invention, it is basically the same as that of the tenth aspect, but in particular, even for an information medium on which AV data such as a music CD is recorded, the data is sucked out. In the case of the read request mode, the high speed is required as the transfer rate of the data read. Therefore, the comparison of comparing the transfer rate of the data transferred from the data read cache memory to the host with a certain threshold value. If the measured transfer rate exceeds a certain threshold as a result of comparison by the comparison means and the comparison means, the rotation speed of the information medium is increased to, for example, an upper limit value by the rotation speed control means. Can be read at a high speed in order to maximize the performance of the information reproducing apparatus.

  According to the thirteenth aspect of the present invention, for example, with respect to the same information medium on which AV data is recorded, the user may alternately request the reproduction of the AV data and the suction of the AV data. While reading is in progress, the transfer rate is always measured by the measuring means, and as a result of the comparison by the comparing means, the rotation speed of the information medium is switched between the low speed side and the high speed side by the rotation speed control means at the threshold. Since it is controlled, it can be rotated at a low speed during reproduction, and can be rotated at a high speed during data extraction, so that noise and data reading errors can be suppressed during AV data reproduction. It can be processed at high speed to maximize performance.

  According to the invention described in claim 14, in the information reproducing apparatus according to any one of claims 11 to 13, generally, when AV data is reproduced, a read request from the user tends to be issued periodically. Paying attention to the fact that this can be one material for determining whether or not AV data is being reproduced, monitoring means for monitoring whether or not a read request is issued from a user over a certain period of time, and a result of monitoring by this monitoring means, Re-measurement means for re-measuring the data read transfer rate when the read request is not issued for a predetermined time or more during measurement of the data read transfer rate, so that the accuracy of the transfer rate measurement is provided. Therefore, normal data files are read out at low speed, or the sound is interrupted by shifting to the highest speed during AV data playback. It is possible to avoid or stop the video, it is possible to properly carry out the division of the reading of reproduction and normal data file of the AV data file.

  According to the fifteenth aspect of the present invention, in the information reproducing apparatus according to any one of the eleventh to thirteenth aspects, when AV data is reproduced, generally the read addresses in the read request from the user are in ascending order. Focusing on the point that it can be one material for determining whether or not AV data is being reproduced, an address monitoring means for monitoring whether or not the read address in the read request from the user is in ascending order, and this address monitoring means As a result of monitoring, if the read address requested to be read during measurement of the transfer rate of data read is not in ascending order, re-measurement means is provided for re-measuring the transfer rate of data read. The accuracy of rate measurement can be improved, so normal data files can be read at a low speed, or AV data can be read. The sound and speed to maximum speed or stopped the video interrupted or can be avoided during playback, it is possible to properly carry out the division of the reading of reproduction and normal data file of the AV data file.

  According to a sixteenth aspect of the present invention, in the information reproducing apparatus according to any one of the eleventh to thirteenth aspects, the effectiveness is determined by measuring a plurality of transfer rates as one set, and a plurality of sets within one set are determined. If the transfer rate measurement results are the same, the transfer rate is validated to improve the reliability of the obtained transfer rate and temporarily change the transfer rate. Can deal with.

  According to the seventeenth aspect, in the information reproducing apparatus according to the thirteenth aspect, the threshold value for increasing the rotation speed of the information medium is larger than the threshold value for decreasing the rotation speed of the information medium. As a result, it is possible to avoid the problem of repeatedly decelerating and increasing the rotational speed of the information medium when reading at a transfer rate near the threshold value.

  According to the eighteenth aspect of the present invention, a cache memory is provided that temporarily stores information read from an information medium before it is transferred. 18. The information reproducing apparatus according to claim 11, wherein reading is performed, and when the measuring unit is reading information from the information medium at a maximum speed, the cache memory is full. Since the transfer rate measurement is started when the pre-reading of data is completed, the transfer rate is not measured unnecessarily during the reading process at the highest speed, preventing a decrease in the reading process performance. can do.

  A first embodiment of the present invention will be described with reference to FIGS. First, FIG. 1 shows a schematic configuration of an information reproducing apparatus to which the present embodiment is applied. The present embodiment shows an application example to an optical disk drive 2 that is used by being integrated in a host 1 such as a so-called personal computer or the like, and the information medium 3 is a CD-ROM or the like for original data. In particular, AV data such as music CD (CD-DA), video CD, WAV file recorded on CD, and MP3 file are targeted. The AV data is configured as a system that can be reproduced as audio by a USB speaker mounted on the host 1 or displayed as a video screen through a display or the like, and can be stored in a memory or the like.

  In the optical disc drive 2, the information medium 3 is rotationally driven by a spindle motor 4 which is a motor. Further, an optical pick-up 5 for condensing and irradiating laser light to the information medium 3 that is rotationally driven by the spindle motor 4 is provided so as to be able to seek in the medium radial direction by the coarse motor 6. The optical pickup 5 includes a semiconductor laser that emits laser light, an objective lens for condensing the laser light, a light receiving detection system that receives reflected light from the information medium 3 and detects a reproduction signal and other various signals. I have. Here, the reproduction signal (read information) detected by the light receiving detection system in the optical pickup 5 is temporarily stored in the cache memory 8 through the processing by the signal processing system 7 and transferred to the host 1 side via the external interface 9. Is done. Further, control systems 10, 11, and 12 are provided for the spindle motor 4, the optical pickup 5, and the coarse motion motor 6, respectively, and the control system 10, 11, 12 and the cache memory 8 are provided by the controller 13 in the microcomputer configuration. Is controlled. In addition to these controls, the controller 13 is responsible for understanding the mode of read requests from the user via the host 1, grasping the data transfer rate, and other various controls, and implements various functions as described below.

  In such a configuration, an outline of a read processing control example executed by the controller 13 when there is a data read request from the user through the host 1 will be described with reference to the flowchart of FIG.

  First, when there is a data read request (step S1), reading of data from the information medium 3 is started by the optical pickup 5 while rotating the information medium 3 at a predetermined rotation speed by the spindle motor 4 through the control of the rotation control system 10. (S2) The read data is transferred to the host 1 side via the external interface 9 while being sequentially stored in the cache memory 8. The average transfer rate at this time is measured (S3). The process of step S3 is executed as a function of the measuring means. Then, the measured average transfer rate value is compared with a predetermined threshold value (S4). The process of step S4 is executed as a function of the comparison means. If the average transfer rate is larger than the threshold value as a result of this comparison (N in S4), the reading process is performed at the medium rotation speed as it is, and the reading process is terminated (S7).

  On the other hand, if the average transfer rate is equal to or lower than the threshold (Y in S4), it is determined whether or not the current medium rotation speed is the highest speed (S5), and if the reading is not performed at the highest speed (S5). = Low-speed reading) (N in S5), the reading process is performed at the rotational speed as it is, and the reading process ends (S7). However, if reading is performed at the highest speed (Y in S5), the rotation speed of the information medium 3 is reduced to a predetermined reproduction speed to perform reading (S6), and the reading process ends (S7). The process of step S6 is executed as a function of the rotational speed control means for reducing the rotational speed of the information medium 3.

  An example of the average transfer rate measurement process in step S3 is shown in the flowchart of FIG. When the average transfer rate measurement is started (S8), first, the measurement start time is measured (S9). Thereafter, the number of blocks transferred to the host 1 via the external interface 9 is accumulated according to a read request from the user (S10), and it is determined whether the accumulated (sampling) number of blocks has been sampled by a predetermined number of blocks (S11). ). If sampling of the number of transfer blocks is not completed (N in S11), sampling is continued (S10). If sampling is completed (Y in S11), the difference between the transfer rate measurement time from the start time and the transfer The average transfer rate is calculated from the number of blocks (S12), and the average transfer rate measurement is terminated (S13).

  Here, the present embodiment pays attention to the fact that the read transfer rate differs depending on the read mode requested by the user through the host 1, even when the same file is read in reading from the information medium 3. By measuring the average transfer rate, switching between low-speed reading and maximum-speed reading is performed in accordance with the difference in reading mode. For example, even when the same WAV file is read, if the user requests reading for WAV playback, the data transfer rate to the host 1 side is low (Y in S3 and S4), so the highest speed is achieved. If it is rotating, it is possible to avoid WAV playback at an unnecessarily high speed by reducing the playback speed to a predetermined playback speed (S6). As a result, the problem of noise and power consumption due to high-speed rotation can be solved, and the possibility of erroneous data reading can be reduced. On the other hand, even when the same WAV file is read out, if the user requests to read out WAV data, the data transfer rate to the host 1 side is high (N in S3 and S4). In order to make the best use of the performance of the drive 2, it can be processed at high speed.

  A second embodiment of the present invention will be described with reference to FIG. The same parts as those shown in the first embodiment are denoted by the same reference numerals, and description thereof is also omitted (the same applies to the following embodiments). Basically, it is the same as in the case of the first embodiment. When a data read request is received from the user (S1), data reading is started (S2) and the average transfer rate is measured (S3). . As a result of the measurement, it is compared whether or not the average transfer rate is equal to or higher than a predetermined threshold value (S14). The process of step S14 is executed as a function of the comparison means. If the average transfer rate is equal to or less than the threshold value as a result of the comparison (N in S14), reading from the information medium 3 is performed at the same rotation speed and the reading process is terminated (S7). If it is equal to or greater than the threshold value (Y in S14), it is determined whether reading is currently being performed at a predetermined playback speed (S15). If reading is not performed at a predetermined reproduction speed (N in S15), reading is performed at the same speed and the reading process is terminated (S7), but if reading is performed at a predetermined reproduction speed (S15). Y), reading is performed at the highest reading speed (S16), and the reading process is terminated (S7). The process of step S16 is executed as a function of the rotation speed control means for increasing the rotation speed of the information medium 3.

  Therefore, according to the present embodiment, in the case of a read request from a user that causes the data to be sucked out even in the case of an information medium on which AV data such as a music CD is recorded, the average of data read Since high speed is required as the transfer rate, the average transfer rate is measured by the measuring means (S3), and if the comparison result by the comparing means exceeds a predetermined threshold value (S14) Y) By increasing the rotation speed of the information medium to, for example, an upper limit value by the rotation speed control means (S16), the data can be read out at a high speed in order to make the best use of the performance of the information reproducing apparatus.

  A third embodiment of the present invention will be described with reference to FIG. This embodiment basically shows an application example when the first and second embodiments are combined. When a data read request is received from the user through the host 1 (S1), data reading is started (S2), and the average transfer rate is measured (S3). As a result of the measurement, it is compared whether or not the average transfer rate is equal to or lower than a predetermined threshold value (S4). If the average transfer rate is equal to or less than the threshold value as a result of the comparison (Y in S4), it is determined whether or not the current reading speed is the highest speed (S5). If reading is not performed at the maximum speed (N in S5), reading is performed at the same speed, but if reading is performed at the maximum speed (Y in S5), the reading speed is reduced to a predetermined reproduction speed. Reading is performed (S6).

  On the other hand, if the average transfer rate exceeds a predetermined threshold (N in S4), it is determined whether or not the current reading speed is a predetermined reproduction speed (S15). If reading is not performed at the reproduction speed (N in S15), the reading is performed at the same speed. However, if reading is performed at the reproduction speed (Y in S15), the reading speed is changed to the highest speed and reading is performed. Perform (S16). Thereafter, if the reading process is not completed (S17), the transfer rate is continuously measured (S3). If the reading process is completed, the process is terminated (S7).

  Therefore, for example, with respect to the same information medium 3 on which AV data is recorded, there is a case where the user alternately requests AV data reproduction and AV data extraction. The average transfer rate is always measured by the measuring means while reading the data (S3), the comparison result by the comparing means (S4), and the rotational speed of the information medium 3 is set to the rotational speed control means with the threshold as a boundary. By switching control between the low speed side and the high speed side (S6, S16), it is possible to rotate at a low speed during reproduction and to rotate at a high speed during data extraction, thereby suppressing noise and data reading error problems during AV data reproduction. Therefore, at the time of data extraction, processing can be performed at high speed in order to make the best use of the performance of the information reproducing apparatus.

  A fourth embodiment of the present invention will be described with reference to FIG. For example, the present embodiment pays attention to the fact that, generally, when AV data is reproduced, a data read request from a user is periodically issued, and thus a tendency different from that at the time of reading a normal data file is shown. The accuracy of the average transfer rate measurement process necessary for realizing the first to third embodiments is improved.

  When measurement of the average transfer rate is started (S8), first, measurement start time is measured (S9). Then, the number of blocks transferred to the host 1 in response to a read request from the user is accumulated (S10), and after a predetermined time, it is determined whether or not the accumulated (sample) number of blocks has increased (S18). If the number of sample blocks has not increased (N in S18), it is determined whether or not a predetermined time has elapsed (S19). If not (N in S19), the transfer block sampling is continued. (S10). If a predetermined time has elapsed (Y in S19), the transfer rate measurement is newly started (S9). That is, the processes of steps S18 and S19 are executed as the function of the monitoring means, and the processes of Y and S9 of step S19 are executed as the functions of the re-measurement means. Thereafter, when the number of accumulated blocks is accumulated by a predetermined number of blocks and sampling is completed (Y in S11), an average transfer rate is calculated from the difference in transfer rate measurement time from the start time and the number of transfer blocks (S12). ), The average transfer rate measurement is terminated (S13).

  That is, the transfer rate is measured without distinguishing between an AV data file and a normal data file, and in order to realize the first to third embodiments described above, a normal data file is read at a low speed. In order to prevent the sound from being interrupted or the video from being stopped due to the highest speed during reproduction or AV data reproduction, it is necessary not to make an error in the measurement of the average transfer rate for data reading in step S3. . For example, in normal data file reading, when reading of a data file is resumed after a read request from a user is temporarily interrupted, the average transfer rate tends to be measured lower than actual. In this regard, when reproducing AV data, generally, a read request from a user tends to be issued periodically, and this can be one material for determining whether or not AV data is being reproduced. That is, depending on how the application performs reading, generally, AV data read request issuance timing is also periodically issued with a certain period. On the other hand, normal data file reading is random, non-periodic, and the reading process is interrupted when the user is not performing an operation.

  In consideration of such points, in the present embodiment, in the measurement of the average transfer rate shown in step S3, when a read request is not issued for a certain time (N in S18, Y in S19), Since it is considered that there is a high possibility of reading a normal data file, the measurement accuracy is improved by re-measuring the average transfer rate (Y in S19, S9). It can be avoided that the operation is performed at a low speed or the sound is interrupted or the video is stopped due to a shift at the highest speed during AV data reproduction. That is, it is possible to properly distinguish between reproduction of the AV data file and reading of the normal data file.

  A fifth embodiment of the present invention will be described with reference to FIG. In the present embodiment, for example, when reproducing AV data, attention is paid to the fact that, generally, a data read request from a user is issued in ascending order of address, and thus shows a tendency different from that when reading a normal data file. The accuracy of the average transfer rate measurement process necessary for realizing the first to third embodiments is improved.

  When measurement of the average transfer rate is started (S8), first, measurement start time is measured (S9). Then, the number of blocks transferred to the host 1 in response to a read request from the user is accumulated (S10), and it is determined whether or not the read addresses are in ascending order (S20). If the read addresses are not in ascending order (N in S20), transfer rate measurement is newly started (S9). If the addresses are in ascending order (Y in S20), sampling is continued, and it is determined whether or not the cumulative number of blocks has been sampled by a predetermined number of blocks (S11). That is, the process of step S20 is executed as a function of the monitoring unit, and the processes of Y and S9 of step S20 are executed as the function of the re-measurement unit. If sampling of the number of transfer blocks is not completed (N in S11), sampling is continued (S10). If sampling is completed (Y in S11), the difference between the transfer rate measurement time from the start time and the transfer The average transfer rate is calculated from the number of blocks (S12), and the average transfer rate measurement is terminated (S13).

  That is, the transfer rate is measured without distinguishing between an AV data file and a normal data file, and in order to realize the first to third embodiments described above, a normal data file is read at a low speed. In order to prevent the sound from being interrupted or the video from being stopped due to the highest speed during reproduction or AV data reproduction, it is necessary not to make an error in the measurement of the average transfer rate for data reading in step S3. . For example, in normal data file reading, when reading of a data file is resumed after a read request from a user is temporarily interrupted, the average transfer rate tends to be measured lower than actual. In this regard, when reproducing AV data, generally, a read request from a user tends to be issued in a form in which read addresses are in ascending order, and this can be one material for determining whether or not AV data is being reproduced. For example, in an audio disc or the like, data is arranged in order from the inner periphery to the outer periphery, and video data, WAV data, and MP3 data are generally arranged in the same order, and an address in a read request from a user is When the length Y is read from the address X in a certain read request, the address read order is usually as requested from the address (X + Y) in the next read request. On the other hand, in the case of reading a normal data file, the read request address is random when reading the file information or reading the file body.

  Considering such points, in this embodiment, when the average transfer rate is measured in step S3, when the read request addresses are not in ascending order (N in S20), the normal data file is read. Since the measurement accuracy is improved by re-measuring the average transfer rate (S9), the normal data file is read at a low speed or during AV data playback. It is possible to prevent the sound from being interrupted or the video from stopping by shifting to the highest speed.

  A sixth embodiment of the present invention will be described with reference to FIG. This embodiment also improves the accuracy of the average transfer rate measurement process necessary for realizing the first to third embodiments described above. Specifically, for example, when the user skips playback during playback of AV data by reading at low speed rotation, the skip portion is read from the information medium 3 at a stretch and stored in the buffer memory on the host 1 side serving as the transfer destination. There are applications that allow the data to be stored, but this provides an average transfer rate measurement process that can cope with such applications.

  When the average transfer rate measurement is started (S8), first, the measurement start time is measured (S9), and the number of blocks transferred to the host 1 in response to a read request from the user is accumulated (S10). It is determined whether or not the number of accumulated (sampling) blocks has been sampled by a predetermined number of blocks (S11). If sampling of the number of transfer blocks has not been completed (N of S11), sampling is continued (S10). . When the sampling is completed (Y in S11), it is determined whether or not the average transfer rate has been calculated a predetermined number of times for one set (S21). If the predetermined number of times has not been measured (N in S21), the average transfer rate is continuously measured (S9). When the average transfer rate has been measured a predetermined number of times for one set (Y in S21), it is determined whether or not the values of the plurality of average transfer rates are comparable (S22). ). If the values are comparable (Y in S22), the value is valid and the average transfer rate measurement is terminated (S13). If the variation is large (N in S22), the value is Measurement is performed again as invalid (S9).

  Therefore, according to the present embodiment, the effectiveness of a plurality of times of average transfer rate measurement is determined as one set, and the measurement result of the number of times of average transfer rate within one set is the same transfer rate. In such a case, the average transfer rate is made effective. In other words, it is possible to improve the reliability of the average transfer rate obtained by providing the same average value for multiple average transfer rates as the effective average transfer rate value. It is possible to cope with a temporary transfer rate change such that the average transfer rate temporarily increases.

  A seventh embodiment of the present invention will be described with reference to FIG. This embodiment is applied to the third embodiment described above.

  When a data read request is received from the user (S1), data reading is started (S2), and the average transfer rate is measured (S3). Next, it is determined whether or not the data is read at the highest speed (S5). If the data is read at the highest speed (Y in S5), the measured average transfer rate is set to a predetermined threshold value set in advance. It is compared whether or not it is equal to or less than M (S23). The process of step S23 is executed as a function of the comparison means. As a result of comparison, if the average transfer rate is not less than or equal to the threshold value M (N in S23), reading is performed at the same speed, but if it is equal to or less than the threshold value M (Y in S23), the reading speed is set to a predetermined value. The reading speed is reduced to the reading speed (S6).

  On the other hand, if the data is not read at the highest speed (N in S5), it is determined whether or not the measured average transfer rate is equal to or higher than a predetermined threshold value N (S24). . The processing in step S24 is also executed as a function of the comparison means. In this embodiment, the threshold values M and N are different values, and the relationship of M <N is set. If the average transfer rate does not exceed the threshold value N or more (N in S24), reading is performed at the same speed, but if the threshold value N is exceeded (Y in S24), the reading speed is maximized. Reading is performed at a high speed (S16). Thereafter, if the reading process is not completed (N in S17), the transfer rate is continuously measured (S3), and if the reading process is completed (Y in S17), the process is terminated (S7).

  Thus, according to the present embodiment, the threshold value N for increasing the rotation speed of the information medium 3 (M, N) is higher than the threshold value M for decreasing the rotation speed of the information medium 3. ), Even if the data transfer rate requested by the user is near the threshold value when the rotation speed of the information medium is switched, the rotation speed of the information medium is read at the time of reading at the transfer rate near the threshold value. The problem of repeated deceleration / acceleration can be avoided.

  An eighth embodiment of the present invention will be described with reference to FIG. In the present embodiment, a decrease in performance due to an average transfer rate measurement process necessary for realizing each of the above-described embodiments is prevented.

  That is, generally, the optical disk drive 2 generally has a buffer called a cache memory 8 and pre-reads to store data in the cache memory 8. When there is a read request from the host 1, the optical disc drive 2 reads the requested address on the information medium 3, transfers the data to the host 1, and ends the processing for the read request, but here stops the reading itself. Instead, the process of reading data from the information medium 3 and storing the data in the cache memory 8 is performed as a “first read process”, and the process ends when the cache memory 8 is full. According to such pre-reading, if data is stored in the cache memory 8 in advance, it is only necessary to return the data in the cache memory 8 to the host 1 when read requests are issued continuously. Since the access to the medium 3 does not occur, the reading process can be speeded up.

  At the start of measurement of the average transfer rate (S8), it is first determined whether or not reading is currently being performed at high speed (S5). If reading is not performed at high speed (N in S5), the transfer rate measurement start time is measured (S9), and sampling of the transfer block is started as usual (S10).

  On the other hand, if reading is being performed at high speed (Y in S5), it is determined whether or not there is free space in the cache memory 8 and the pre-reading process is being performed (S25). If the pre-read process is in progress (Y in S25), after waiting for the pre-read process to end (N in S25), the transfer rate measurement start time is measured as usual (S9), and the transfer block is sampled. Is started (S10). Thereafter, it is determined whether or not the cumulative number of blocks has been sampled (S11). If the transfer block number has not been sampled (N in S11), the sampling is continued (S10). When the sampling is completed (Y in S11), the average transfer rate is calculated from the difference in transfer rate measurement time from the start time and the number of transfer blocks (S12), and the average transfer rate measurement is ended (S13).

  When the cache memory 8 has free space, data is pre-read. However, when the information is read at the highest speed, the pre-read of the data causes the cache memory 8 to become full. This means that reading from the user is slower than reading speed. Therefore, when the information reading is performed at the highest speed, the measurement of the average transfer rate is started when the cache memory 8 is full and the data pre-reading is completed (N in S25). The average transfer rate is not unnecessarily measured during the reading process at the maximum speed, and the reading process performance can be prevented from being deteriorated. On the other hand, when reproducing AV data, the average transfer rate is originally slow and the cache memory 8 is full, and the pre-reading is completed. Therefore, measurement of the transfer rate can be started as it is (N in S5, S9). .

1 is a schematic configuration diagram showing an optical disc drive according to a first embodiment of the present invention. It is a schematic flowchart which shows the example of the reading process control. It is a flowchart which shows the example of the transfer rate measurement process. It is a schematic flowchart which shows the example of read-out process control of 2nd embodiment of this invention. It is a schematic flowchart which shows the example of read-out process control of 3rd embodiment of this invention. It is a flowchart which shows the example of a transfer rate measurement process of 4th Embodiment of this invention. It is a flowchart which shows the example of a transfer rate measurement process of 5th embodiment of this invention. It is a flowchart which shows the example of the transfer rate measurement process of the 6th Embodiment of this invention. It is a schematic flowchart which shows the example of read-out process control of the 7th Embodiment of this invention. It is a flowchart which shows the example of the transfer rate measurement process of 8th Embodiment of this invention.

Explanation of symbols

3 Information medium 4 Motor 5 Optical pickup 8 Cache memory S3 Measuring means S4 Comparison means S6 Rotational speed control means S14 Comparison means S16 Rotational speed control means S18, S19 Y of monitoring means S19, S9 Remeasurement means S20 N of monitoring means S20, S9 Remeasurement means S23, S24 Comparison means

Claims (18)

An information reproducing method for reading information from a rotationally driven information medium to a host via a cache memory,
An information reproducing method in which a rotation speed of the information medium is determined in accordance with a transfer rate of data transferred from the cache memory to the host. An information reproducing method for reading information from a rotationally driven information medium to a host via a cache memory,
An information reproducing method for reading information by reducing a rotation speed of the information medium when a transfer rate of data transferred from the cache memory for reading data to the host is below a certain threshold value. An information reproducing method for reading information from a rotationally driven information medium to a host via a cache memory,
An information reproducing method for reading information by increasing a rotation speed of the information medium when a transfer rate of data transferred from the cache memory for data reading to the host exceeds a certain threshold value. An information reproducing method for reading information from a rotationally driven information medium to a host via a cache memory,
When the transfer rate of data transferred from the cache memory for reading data to the host is below a certain threshold value, the information medium is read at a lower rotational speed and the transfer rate is at a certain threshold. An information reproducing method for reading information by increasing the rotational speed of the information medium when the value is exceeded.   Monitors whether or not a read request is issued by the user, and re-measures the data read transfer rate if the read request is not issued for a certain period of time or more during the data read transfer rate measurement. The information reproduction method according to claim 2.   The read address in the read request from the user is monitored, and when the read address requested by the read request is not in ascending order during the data read transfer rate measurement, the data read transfer rate is measured again. The information reproduction method according to claim 2.   Effectiveness is determined by measuring multiple transfer rates as one set, and if the multiple transfer rate measurement results in one set are comparable, the transfer rate is validated. The information reproducing method according to any one of claims 2 to 4.   5. The information reproducing method according to claim 4, wherein the threshold value for increasing the rotation speed of the information medium is larger than the threshold value for decreasing the rotation speed of the information medium. 9. A cache memory that temporarily stores information read out from the information medium is used, and data is pre-read if the cache memory has free space after a read request by a user. An information reproducing method according to any one of the above,
An information reproduction method in which, when reading information from the information medium at the highest speed, measurement of a transfer rate is started when the cache memory is full and pre-reading of data is completed. An information reproducing apparatus comprising: a motor that rotates an information medium; and an optical pickup that reads information on the information medium, and reads information from the rotationally driven information medium to a host via a cache memory,
An information reproducing apparatus configured to determine a rotation speed of the information medium by the motor in accordance with a transfer rate of data transferred from the cache memory to the host. An information reproducing apparatus comprising: a motor that rotates an information medium; and an optical pickup that reads information on the information medium, and reads information from the rotationally driven information medium to a host via a cache memory,
A comparing means for comparing a transfer rate of data transferred from the cache memory for data reading to the host with a certain threshold value;
An information reproducing apparatus comprising: a rotation speed control means for controlling the motor to reduce the rotation speed of the information medium when the measured transfer rate is equal to or lower than a certain threshold value as a result of the comparison by the comparison means. An information reproducing apparatus comprising: a motor that rotates an information medium; and an optical pickup that reads information on the information medium, and reads information from the rotationally driven information medium to a host via a cache memory,
A comparing means for comparing a transfer rate of data transferred from the cache memory for data reading to the host with a certain threshold value;
An information reproducing apparatus comprising: a rotation speed control means for controlling the motor to increase the rotation speed of the information medium when the measured transfer rate exceeds a certain threshold as a result of the comparison by the comparison means. An information reproducing apparatus comprising: a motor that rotates an information medium; and an optical pickup that reads information on the information medium, and reads information from the rotationally driven information medium to a host via a cache memory,
Measurement means for constantly measuring the transfer rate of data transferred from the cache memory for data reading to the host, and comparison means for comparing the measured transfer rate with a certain threshold value;
As a result of the comparison by the comparison means, if the measured transfer rate is less than a certain threshold value, the motor is controlled so as to reduce the rotation speed of the information medium. An information reproducing apparatus comprising: a rotation speed control means for controlling the motor so as to increase the rotation speed of the information medium when exceeding. Monitoring means for monitoring whether or not a read request is issued from a user over a certain period of time;
Re-measuring means for re-measuring the data reading transfer rate when the reading request is not issued for a predetermined time or more during measurement of the data reading transfer rate as a result of monitoring by the monitoring means. Item 14. The information reproducing device according to any one of Items 11 to 13. Address monitoring means for monitoring whether or not the read addresses in the read request from the user are in ascending order;
As a result of monitoring by this address monitoring means, if the read address requested to be read during measurement of the data read transfer rate is not in ascending order, re-measurement means for re-measuring the data read transfer rate, An information reproducing apparatus according to any one of claims 11 to 13.   The measurement means determines the effectiveness of a plurality of transfer rate measurements as one set, and if the measurement result of the plurality of transfer rates in one set is the same transfer rate, the transfer rate 14. The information reproducing apparatus according to claim 11, wherein the information reproducing apparatus is made effective.   14. The information reproducing apparatus according to claim 13, wherein the comparing means is set such that a threshold value for increasing the rotation speed of the information medium is larger than a threshold value for decreasing the rotation speed of the information medium. . 18. A cache memory for temporarily storing information read from the information medium before transfer, wherein data is pre-read if the cache memory has free space after a read request by a user. An information reproducing apparatus according to any one of the above,
When the information reading from the information medium is performed at the highest speed, the measuring means starts measuring the transfer rate when the cache memory is full and the pre-reading of data is completed. Information playback device.

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