JP2003045123A - Disk player and disk playback method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a disk player which plays back a disk by automatically skipping the unvoiced sound part of the disk. SOLUTION: The disk player which plays back the disk having music information recorded on a plurality of blocks is provided with an amplitude measuring means 23 which measures the amplitude of an acoustic signal included in a regenerated signal from the disk, an unvoiced sound discriminating means 43 which discriminates whether or not the signal in the block includes an acoustic signal according to the output of the amplitude measuring means 23, and an identification information storage means 44 which stores the identification information of the block discriminated by the unvoiced sound discriminating means 43 that the block does not contain the acoustic signal. When the disk player plays back the disk, the disk player refers to the identification information of the identification information storage means 44. The disk player does not play back a block whose identification information is included in the identification information stored in the identification information storage means 44, and plays back a voiced sound block to be played back next.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disc reproducing apparatus and a disc reproducing method, and more particularly to a disc reproducing apparatus and a disc reproducing method which prevent reproduction of a portion where music information is not recorded.

[0002]

2. Description of the Related Art In a compact disc (hereinafter, also referred to as a CD), music information is often recorded in each track in units of music or movement, but in some cases, no music information is recorded in tracks. There is also. There may also be long periods of silence in some of the tracks. In the following description, a track in which no music information is recorded will be referred to as a silent track, and a recording area in which no music information is recorded will also be referred to as a silent block or simply a silent portion.

In a conventional CD reproducing apparatus, when a disc is loaded, first, TOC (Table Of Contents) information is referred to,
It is determined whether the disc is a music disc on which music information is recorded or a ROM disc on which data other than music is recorded. When the disc type is identified as a "music disc", the control data of the subcode Q in the TOC information is referred to identify whether the track to be played back is a music track or a data track, and If it is a track, activate mute.

[0004]

[Problems to be Solved by the Invention] However, music C
In D, there may be a signalless track in which nothing is recorded, or a silent part for a long time may be present in a part of the track.
Even if a silent track included in is played back, or if a voiced track in which music information is recorded is played back, no sound will be output from the speaker if a silent part of that track is played back. There was a problem that silence remained for a long time.

The present invention has been made to solve the above problems, and an object thereof is to provide a disk reproducing apparatus and a disk reproducing method for automatically skipping and reproducing a silent portion of a disk.

[0006]

The present invention has been made in view of the above problems, and the first invention is a disk reproducing apparatus for reproducing a disk in which music information is recorded in a plurality of blocks, Amplitude measuring means for measuring the amplitude of the acoustic signal included in the signal reproduced from the disc, and a silence determining means for determining whether or not the signal in the block includes the acoustic signal according to the output of the amplitude measuring means. Identification information stored in the identification information storage means when the disc is reproduced, the identification information storage means storing identification information of a block determined to contain no acoustic signal by the silence determination means. For a block in which the identification information of the block is included in the identification information stored in the identification information storage means, the block is not reproduced, but should be reproduced next. It is a disk reproducing apparatus that reproduce the sound block. In order not to reproduce the block, the block may not be read from the disk, or the read signal of the block may not be input to the digital / analog converter (DAC).

A second invention is the disc reproducing apparatus of the first invention, further comprising a buffer memory for storing the digital signal reproduced from the disc, and discriminating that the reproduced signal of a certain block does not include an acoustic signal. If so, the disc reproducing apparatus is configured to discard the reproduction signal of the block stored in the buffer memory.

According to a third aspect of the present invention, in the disc reproducing apparatus of the first aspect, a buffer memory for storing a digital signal reproduced from the disc and a D / D for converting an acoustic signal read from the buffer memory into an analog signal. A
A converter is further provided, and the amplitude measuring means includes the D / A.
The amplitude of the acoustic signal is measured using the signal before being input to the converter, and the silence determining means determines that the signal of the block is the acoustic signal before the signal of the block is output from the D / A converter. If it is determined that the reproduction signal of the block does not include the acoustic signal, it is determined whether the reproduction signal of the block stored in the memory is the D / A.
It is a disk reproducing device which outputs a reproduced signal of a voiced block to be output next without outputting from the converter.

According to a fourth aspect of the present invention, in the disc reproducing apparatus according to any one of the first to third aspects of the invention, in the silence judging means for a certain block not containing an acoustic signal,
The disc reproducing apparatus determines that the reproduction signal of the block does not include an acoustic signal only when the block length of the block is equal to or larger than a predetermined value.

A fifth aspect of the present invention is the disc reproducing apparatus according to any one of the first to fourth aspects, wherein the disc reproducing apparatus is a compact disc reproducing apparatus, and the identification information is ISRC or a disc in a compact disc. It is a disc reproducing apparatus in which a number and a track number are set.

A sixth aspect of the invention is to measure the amplitude of an acoustic signal included in a signal reproduced from a disc in which music information is recorded in a plurality of blocks, and whether or not the signal of the block includes the acoustic signal. Is determined according to the measured amplitude, a step of storing identification information of a block determined not to include an acoustic signal in the step, and a reference to the identification information stored when the disc is reproduced And a step in which the identification information of the block is included in the stored identification information, the block is not reproduced, and the voiced block to be reproduced next is reproduced. This is a disc playback method. In order not to reproduce the block, the block may not be read from the disc, or the read signal of the block may not be output.

According to a seventh aspect of the present invention, in the disc reproducing method of the sixth aspect, when it is determined that the reproduction signal of a block does not include an acoustic signal, the reproduction signal of the block stored in the buffer memory. This is a disc playback method that discards.

An eighth aspect of the present invention is the disc reproducing method according to the sixth or the seventh aspect of the invention, in which a certain block that does not include an acoustic signal is recorded only when the block length of the block is a predetermined value or more. This is a disc reproducing method for determining that the reproduced signal does not include an acoustic signal.

A ninth invention is the disk reproducing method according to any one of the sixth to eighth inventions, wherein the identification information is ISRC in a compact disk, or a disk number and a track number. .

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below. FIG. 1 is a block diagram showing an embodiment of a disc reproducing apparatus of the present invention. A disc reproducing apparatus 10 of the present invention shown in FIG. 1 is a disc reproducing apparatus for reproducing a disc 11 in which music information is recorded in a plurality of blocks, and the amplitude of an acoustic signal included in a signal reproduced from the disc 11 is measured. The amplitude measuring means 23 for measuring, the silence determining means 43 for determining whether or not a signal of one block includes an acoustic signal according to the output of the amplitude measuring means 23, and the silence determining means 4
3 includes identification information storage means 44 for storing identification information of a block which is determined not to include an acoustic signal, and when the disc is reproduced, the identification information of the identification information storage means 44 is referred to, For the block in which the identification information of No. 1 is included in the identification information stored in the identification information storage unit 44, the block is not read from the disk,
Alternatively, even if it is read, the block is not reproduced by not outputting it to the DAC 29, and the sound block to be reproduced next is reproduced so that a silent period in which no sound is output from the speaker does not become long. It was done.

In the following description of the embodiments, the case where the disc reproducing device is a CD reproducing device for reproducing a compact disc (CD) will be described as an example. In the CD reproducing apparatus 10 shown in FIG. 1, the system control means 21 controls the reproduction as a whole, reads out information from the compact disc (CD) 11, and the digital / analog converter (DAC) 2
9. Sound is output from the speaker via an output amplifier circuit (not shown).

The reproduced signal read from the CD 11 by the reproducing head 13 is amplified by the RF amplifier 15 and given to the signal processing means 19. The signal processing means 19 performs synchronization, deinterleaving, error correction, etc. on the EFM modulated signal output from the RF amplifier 15, demodulates audio sample data, demodulates TOC information and subcode data. The output of the signal processing means 19 is temporarily stored in the memory 27 controlled by the memory control means 25. The memory control means 25 is the system control means 2
Controlled by 1, the memory 27 reads the reproduction signal from the memory 27 at an appropriate timing and supplies it to the digital / analog converter (DAC) 29.

Access control, focus control, tracking control, etc. in the reproducing head 13 are performed by the reproducing head driving means 17, and various data necessary for the control are transmitted from the RF amplifier 15 and the system controlling means 21 to the reproducing head driving means 17. Given. System control means 21
A display means 31 for displaying the track number, time information and the like regarding the track being reproduced, and an operation means 33 for the operator to operate the CD reproducing apparatus 10 are connected to the. The amplitude measuring means 23 measures the amplitude of the acoustic signal included in the output of the signal processing means 19, and gives the result to the silence judging means 43.

The system control means 21 includes a microprocessor (MPU) 41, a memory 42, a silence determination means 43, an identification information storage means 44, and a reproduction mode determination means 45. Incidentally. The amplitude measuring means 23, the silence judging means 43, the identification information storing means 44, and the reproduction mode judging means 45 are MPU4.
1 and the memory 42 may be used.
The silence determining means 43 determines whether or not the track or the block includes an acoustic signal based on the measurement result obtained by the amplitude measuring means 23. The silence determining means 43 determines that the track is a silence track or determines that the block is a silence block when an acoustic signal of a predetermined level or higher is not detected in the track or the block.

The identification information storage means 44 stores the identification information such as the track number for the track determined to be the silence track by the silence determination means 43. Similarly, with respect to a block determined to be a silent block by the silence determining unit 43, identification information such as a track number and a frame number is stored in the identification information storing unit 44. The silent block may be address information such as a sector address A to a sector address B as an identification number, or may be temporal information such as a time C to a time D in the elapsed time in the track. It can also be information. Before the CD 11 is reproduced, the operator designates in advance whether the reproduction mode is the “normal reproduction mode” or the “skip reproduction mode”, and the specified reproduction mode is stored in the memory 42. The reproduction mode discrimination means 45 discriminates the reproduction mode designated by the operator.

When the CD reproducing apparatus 10 reproduces the CD 11, if the "skip reproduction mode" is designated, the signal is not read from the silent track or the silent block, or the read signal is input to the DAC 29 even if it is read. do not do. This reproduction method is referred to as skip reproduction in this specification. If the "normal reproduction mode" is designated, the skip reproduction described above is not performed, and the data of the silent track or the silent block is input to the DAC 29 and the normal reproduction is performed.

In the following description, the silent track and the silent block are collectively referred to as a silent portion. In order to skip the reproduction of the silent portion, it is necessary to determine in advance whether or not the track or block contains an audio signal of a predetermined level or higher. There are various methods of this discrimination processing and skip reproduction. For example, all discs and tracks to be played that are mounted before actual playback are determined in advance,
The result is stored in the identification information storage means 44, and at the time of actual reproduction, the silent portion is skipped and reproduced based on the identification information stored in the identification information storage means 44. As another method, the discrimination processing is performed while the first reproduction is performed, and the identification information as a result is stored in the identification information storage means 44, and when the second and subsequent reproductions are performed, the identification information storage means 44 is performed. The silent part is skipped and reproduced based on the identification information stored in. Further, after the discrimination process is started prior to the actual reproduction, the reproduction signal of the voiced track may be input to the DAC 29 and the sound thereof may be output when the voiced track is first detected.

The disc reproducing method of the present invention will be described below with reference to a flow chart, but the explanation will be made assuming that the "skip reproducing mode" is designated as the reproducing mode. FIG. 2 is a flow chart showing an embodiment of the silence discrimination processing according to the present invention. The silence determination process shown in FIG. 2 is an example of a case where a plurality of CDs are continuously reproduced using an autochanger, and is an example of performing the silence determination process of each track while performing the first reproduction. Further, in this example, the silent portion is detected as a silent track.

First, reference numerals used in FIG. 2 will be described. Me
mo_DNo (k) indicates the number of the disk containing the track stored as the kth silent track, and Memo_TNo (k) is k.
Track number, which is stored as the th silent track,
Memo_Max is the maximum number of silent tracks that can be stored, Skip_ISR
C (k) is the ISRC of the track stored as the kth silent track, TMP_ISRC is the ISRC of the track being read from the disc, Now_DNo is the disc number of the disc to be played, and N_DNo.
ow_TNo is the track number of the reproduction target track, DNo_Max is the maximum number of mountable discs, Max_TNo () is the maximum track number of the disc, and Skip_Max is the total number of silent tracks to be skipped. In addition, ISRC is Internationa
l An abbreviation for Standard Recoding Code, which is an identification code given to each song on a CD for copy protection and the like. The ISRC is included in the subcode Q channel of the TOC information read from the disc, but the ISRC may not be recorded or its value may be recorded as 0.

In FIG. 2, in step S41, k = 1,
Now_DNo = 1 is set, and Now_TNo = 1 is set in step S43. The reproduction of Now_TNo is started in step S45, and the process proceeds to step S47. In step S47, it is determined whether k is larger than Memo_Max, and if it is larger, step S51.
Otherwise, proceeds to step S49 otherwise. In step S49, the silence determination process shown in FIG.
Proceed to 53. In step S51, the silent flag is set to 0 and the process proceeds to step S53. Silence flag = 0 indicates that the track is not a silence track, and silence flag = 1 indicates that the track is a silence track.

In step S53, it is determined whether or not the silent flag is 1, and if it is 1, the process proceeds to step S55, and if it is 0, the process proceeds to step S61. In step S55, TMP_
Whether or not a valid ISRC is recorded depends on whether or not the ISRC is 0. The ISRC of the track is 0 here.
(TMP_ISRC = 0 means that ISRC value is 0, or ISRC
Indicates a state in which is not recorded. ) Then step S
If it is not 0, the process proceeds to step S57. In step S57, TMP_ISRC is substituted into Skip_ISRC (k), and Memo
_DNo (k) and Memo_TNo (k) are set to 0, the value of k is incremented, and the process proceeds to step S61.

In step S59, Skip_ISRC (k) is set to 0, Now_DNo is assigned to Memo_DNo (k), and Now to Memo_TN0 (k).
_TNo is substituted, the value of k is incremented, and step S
Proceed to 61. In step S61, if Now_TNo is greater than or equal to Max_TNo (), the process proceeds to step S65, and otherwise proceeds to step S63. In step S63, Now_TNo is incremented and the process proceeds to step S45. Step S
In 65, if Now_DNo is greater than or equal to DNo_Max, the process proceeds to step S69; otherwise, the process proceeds to step S67. In step S67, Now_DNo is incremented and the process proceeds to step S43. In step S69, k is substituted for Skip_Max, and this flow ends. Silence track identification information (Skip_ISRC (k), Memo_DNo (k), M
emo_TNo (k)) and Skip_Max are stored in the identification information storage means 44.

In the example shown in FIG. 2, the ISRC value or the disc number and the track number are stored as the identification information regarding the silent track. ISR if a valid ISC is recorded on the disc
C is stored. Since the ISRC is a code unique to the track, the ISRC once stored is valid even after the disc is replaced unless the stored ISRC is erased, and the silence determination of the track is not performed again during reproduction. It can be known from the stored ISRC that the track is a silent track.

Although not shown in the flow chart of FIG. 2, when it is determined that the track is a silent track in the silence determination of a certain track, the reproduction data of the track or a part thereof is already stored in the memory. When it is stored in the memory 27, the reproduction data stored in the memory 27 may be discarded. As a result, when the CD reproducing apparatus 10 is configured so as to discriminate the silence of the track by using the reproduced data read from the disc, and D / A convert the reproduced data to be output from the DAC 29, the silent track. Memory 27
The substantial storage capacity of can be expanded.

FIG. 3 is a flow chart showing details of the silent track determination process (S49) shown in FIG. In FIG. 3, in step S11, the process waits until the sync signal for detecting the Sub Code is detected, and the process proceeds to step S13. In step S13, it is determined whether or not the track is at the head. If not, step S
Proceed to 27. The beginning of the track can be known by the index 001. Level_Max in step S15
(Maximum level of acoustic signal on the track) is set to 0,
In step S17, TMP_ISRC is set to 0. Step S1
At 9, Data_Level (current acoustic signal level) is measured, and the process proceeds to step S21.

In step S21, ISRC is set to Sub Code Q.
Is detected from the data and the process proceeds to step S23. In step S23, if Data_Level is Level_Max or higher, the process proceeds to step S25, and otherwise, the process proceeds to step S11.
In step S25, the value of Data_Level is assigned to Level_Max, and the process proceeds to step S11. When the process proceeds from step S13 to step S27, it is determined whether or not the track is finished in step S27, and when it is finished, step S2.
9. If not completed, the process proceeds to step S19. The end of the track is performed by detecting the change in the track number.

In step S29, Zero_Level is Level_Ma.
If it is greater than or equal to x, the process proceeds to step S31. If not, the process proceeds to step S33. The Zero_Level is a predetermined threshold value for determining whether or not the track is a silent track. In step S31, since this track is a silent track, the silent flag is set to 1 and this flow ends. In step S33, since this track is a voiced track, the silent flag is set to 0, and this flow ends.

FIG. 4 is a flow chart illustrating the skip reproduction method according to the present invention. In this reproducing method, when reproducing a plurality of CDs mounted by a CD reproducing device, a list of identification information indicated by track numbers of tracks which are determined to be silent is referred to before reproduction, and reproduction target tracks are reproduced. If the identification information of No. 1 and some identification information in the list of identification information of the tracks determined to be silent are matched, the track is a silent track, so the track is skipped without being played, and then Play a sound track that should be played. The identification information is, for example, ISR.
Use C but ISRC is not recorded or 0
If it is, the disc number and the track number are used. In a general recording medium, address information such as a sector number or time information such as elapsed time may be used.

In FIG. 4, Now_DNo in step S81.
= 1 is set, and Now_TNo = 1 is set in step S83, and the process proceeds to step S84. In step S84, it is determined whether or not the reproduction mode is the "skip reproduction mode". If the "skip reproduction mode", the process proceeds to step S85, and if the "normal reproduction mode", the process proceeds to step S89. In step S85, k = 1 is set and the process proceeds to step S87. In step S87, it is determined whether or not k is larger than Skip_Max. If it is larger, it means that the track is not a silent track by the silent track matching process described later. Therefore, the process proceeds to step S89, and otherwise. In this case, the silent track matching process, which will be described later, has not yet been completed, and therefore the process proceeds to step S93.

The reproduction of Now_TNo is started in step S89, and the process proceeds to step S91. In step S91, after the reproduction of the track is completed, the process proceeds to step S103. In step S103, if Now_TNo is greater than or equal to the maximum track number Max_TNo () of the disc, the process proceeds to step S107; otherwise, the process proceeds to step S105. In step S105, Now_TNo is incremented and the process proceeds to step S84. In step S107, Now_DNo is DNo_Max.
If it is more than this, this flow is ended, and if not, the process proceeds to step S109. Now_ in step S109
Increment DNo and proceed to step S83.

When the process proceeds from step S87 to step S93, the track to be reproduced is a silent track by the silent track matching process in steps S93, S95, S97, S99, S101, and S87. Whether or not it is determined with reference to the identification information stored in the identification / identification information storage means 44, and if the identification information of the track matches any of the k pieces of identification information stored, the track is determined to be the track. Since the track is a silent track, the process goes to step S103 without playing the track, and if the identification information does not match, the process goes from step S87 to step S89, the Now_Tno is started to be played at step S89, and the process proceeds to step S9.
Go with 1.

The silent track matching process is performed as follows. That is, in step S93, Skip_ISRC (k) and Now_
It is determined whether or not ISRC matches, and if they match, the process proceeds to step S95, and if they do not match, the process proceeds to step S97. In step S95, it is determined whether or not Skip_ISRC (k) is 0. If it is 0, the process proceeds to step S97, and if it is not 0, the process proceeds to step S103. In step S97,
It is determined whether Memo_DNo (k) and Now_DNo match. If they match, the process proceeds to step S99, and if they do not match, the process proceeds to step S101. In step S99, Memo_TNo (k) and Now
Whether or not _TNo matches is determined. If they match, the process proceeds to step S103, and if they do not match, the process proceeds to step S101. In step S101, k is incremented and the process proceeds to step S87.

In the skip playback flowchart shown in FIG. 4, skip playback is performed after performing silence determination on all tracks of all mounted discs to obtain identification information about the silence tracks in advance. However, when the memory 27 is a memory having a relatively large capacity, after the silence determination of some tracks is completed, the acoustic signal of the voiced track is DAC while continuing the silence determination.
29 can be input and output can be started. That is, the amplitude measuring means 23 measures the amplitude of the acoustic signal using the signal before being input to the D / A converter 29, and the silence determining means 43 outputs the signal of the track from the D / A converter 29. Before determining that the signal of the track includes an audio signal, if it is determined that the reproduction signal of the track does not include the audio signal, the reproduction signal of the track stored in the memory 27 is detected. The reproduction signal of the next voiced track is input and output from the DAC 29 to the amplifier without being input to the D / A converter 29. According to this method, it is possible to shorten the silent period due to the silent track from the first reproduction, even if the reproduction is not repeated.

FIG. 5 is a flow chart exemplifying a process for detecting a silent portion at the beginning of a track according to the present invention. This example will also be described using the CD reproducing device, but instead of detecting the silent part in track units, the silent part at the beginning of the track is detected as the elapsed time or frame number in the track, and this is detected. Is stored together with the track number as the identification information, and the silent portion is skipped and reproduced based on the stored identification information at the time of reproduction. Here, only the method for detecting the silent portion at the beginning of the track will be described.

In FIG. 5, when the reading from the CD is started, it waits for the detection of the sync signal for detecting the Sub Code in step S121 and proceeds to step S123. In step S123, it is determined whether or not it is the beginning of the track. If it is the first one, the process proceeds to step S125. If it is not the first one, the process proceeds to step S127. The beginning of the track can be known by the index 001. As initialization processing, ZeroFlag is set to 1 in step S125, and step S131
Then, set TMP_MIN, TMP_SEC, and TMP_FRAME to 0. The TMP_MIN, TMP_SEC, and TMP_FRAME described above represent the current playback position by the elapsed time from the beginning of the track and the frame number, and indicate minutes, seconds, and frame numbers, respectively.

When the process proceeds from step S123 to step S127, it is determined whether or not the track is completed in step S127. If it is completed, the process proceeds to step S129, and if not completed, the process proceeds to step S135. The end of the track is performed by detecting the change in the track number. In step S135, Data_Level (current acoustic signal level) is measured, and the flow advances to step S137. In step S137, Data_Level is a predetermined value Ze
If it is larger than ro_Level, the process proceeds to step S141, and otherwise, the process proceeds to step S139.

In step S141, ZeroFlag is set to 0 and the process proceeds to step S121. ZeroFlag = 0 indicates a sound part. In step S139, if Zero_Level is 1, the process proceeds to step S143; otherwise, the process proceeds to step S121. The Zero_Level is a threshold for determining whether or not the track is a silent track. Also, ZeroFl
ag = 1 indicates a silent part. In step S143, Now_MIN, Now_SE are added to TMP_MIN, TMP_SEC, and TMP_FRAME.
Substitute C and Now_FRAME respectively and proceed to step S121.
When the process proceeds from step S127 to step S129, Skip_MIN, Skip_SEC, Skip_FRA is determined in step S129.
The TMP_MIN, TMP_SEC, and TMP_FRAME are respectively substituted into ME, and this flow ends.

In the process shown in FIG. 5, Now_ before the silent part is detected before the silent part is changed to the sound part.
Skip_MIN, S whose identification information is MIN, Now_SEC, Now_FRAME
It is stored as kip_SEC and Skip_FRAME, and at the time of playback, the stored Skip_MIN and Skip_S from the beginning of the track.
EC and Skip_FRAME are skipped as silence. In this skip, the signal of the silent portion may not be input to the DAC 29, or may not be read from the disc in the case of repeated reproduction.

FIG. 6 is a flow chart exemplifying the processing for detecting the silent portion at the track end portion according to the present invention. This example will also be described using the CD playback device, but instead of detecting the silent portion in track units, the silent portion at the end of the track is detected as the elapsed time or frame number in the track, and this is detected. It is stored together with the track number as identification information, and at the time of reproduction, the silent portion is skipped and reproduced based on the stored identification information. Here, only the method of detecting the silent portion existing from the middle position of the track to the end portion will be described.

The flow shown in FIG. 6 is performed during reproduction of a CD. 6, in step S151, a sub-code detection synchronization signal is detected, and the process proceeds to step S153. In step S153, it is determined whether or not the track is at the head. If the track is the head, the process proceeds to step S155. If not, the process proceeds to step S157. As initialization processing, TMP_MIN, TMP_SEC, and TMP_FRAME are set to 0 in step S155, and the process proceeds to step S161. If the process proceeds from step S153 to step S157, it is determined whether or not the track is finished in step S157. If it is finished, the process proceeds to step S159, and if it is not finished, the step S157 is performed.
Proceed to 161.

In step S161, Data_Level (current sound signal level) is measured, and the flow advances to step S163. In step S163, if Data_Level is larger than the predetermined value Zero_Level set in advance, the process proceeds to step S165, and otherwise, the process proceeds to step S151. Step S
In 165, Now_MI is added to TMP_MIN, TMP_SEC, TMP_FRAME.
Substituting N, Now_SEC, Now_FRAME respectively, step S15
Go to 1. When the process proceeds from step S157 to step S159, Skip_MIN, Skip_SEC,
Substitute TMP_MIN, TMP_SEC, and TMP_FRAME for Skip_FRAME, and end this flow.

In the processing shown in FIG. 6, Now_ before the change from the voiced part to the silent part is finally detected as the voiced part.
MIN, Now_SEC, Now_FRAME are identification information Skip_MIN, Skip_SE
C, Skip_FRAME is stored along with the track number, and during playback, the stored Skip_MIN, Skip_SEC, Skip_FRAME
The frame from the next frame to the end of the track is skipped as a silent part. In this skip, the silent part is D
It may not be input to the AC 29, or may not be read from the disc in the case of repeated reproduction.

In the processing shown in FIGS. 5 and 6, when detecting a silent portion, the reproduction signal of the block is reproduced only when the block length of a certain block not containing the audio signal is equal to or larger than a predetermined value. It may be determined that the signal is not included. As a result, it is possible to prevent a large number of small silent blocks from being detected, and the silent blocks can be easily managed.

In the apparatus of the embodiment shown in FIG. 1, the amplitude measuring means 23 measures the amplitude of the acoustic signal by using the digital information before being input to the DAC 29. However, the amplitude measuring means outputs the analog signal from the DAC 29. The signal can also be used to measure the amplitude of the acoustic signal. Although not shown in the flow chart of the embodiment described below, I
Store SRC as 0. Then, the silent flag is stored in the memory in association with the identification information (ISRC) of the track determined to be the silent track, the stored information is referred to in the second and subsequent reproductions, and the reproduction of the silent track is performed. It will be skipped and the next voiced track will be accessed. An example thereof will be described below with reference to FIGS. 7 and 8.

FIG. 7 is a flow chart exemplifying a process for identifying a silent track using a DAC output signal, and FIG. 8 is a flow chart exemplifying a process for measuring Level_Max (maximum acoustic signal level in a track) shown in FIG. is there. In FIG. 7, in step S171, Sub Code
Wait for the detection sync signal to be detected in step S1.
73. In step S173, it is determined whether or not it is the beginning of the track. If it is the beginning, the process proceeds to step S175, and if not, the process proceeds to step S183. Step S17
In Level 5, Level_Max (maximum level of the acoustic signal on the track) is set to 0, and in step S177, TMP_ISRC is set to 0. In step S179, the track end flag is set to 0, the ISRC is acquired in step S181, and the step S181 is executed.
Proceed to 171.

When the process proceeds from step S173 to step S183, it is determined whether or not the track is completed in step S183. If the process is completed, the process proceeds to step S185, and if not completed, the process proceeds to step S181. In step S185, the track end flag is set to 1 and the process proceeds to step S187. In step S187, if Zero_Level is equal to or higher than Level_Max described later, the process proceeds to step S189, and if not, the process proceeds to step S191. Said Le
The vel_Max detection procedure is as shown in FIG. In step S189, since this track is a silent track, the silent flag is set to 1 and this flow ends. Step S
In 191 there is no sound because this track is a sound track
This flag is set to 0 and this flow ends.

In FIG. 8, in step S201, the interrupt process is performed at predetermined intervals, and the process proceeds to step S203. In step S203, if the track end flag is 0, the process proceeds to step S205.
If the track end flag is 0, the process proceeds to step S201. In step S205, the signal level is measured using the DAC output signal, and the flow advances to step S207. Step S
At 207, the measured level value is substituted for Data_Level and the process proceeds to step S209. Data_L in step S209
If evel is Level_Max or higher, the process proceeds to step S211, and otherwise, the process proceeds to step S201. In step S211, the value of Data_Level is assigned to Level_Max, and the process proceeds to step S201.

As described above in detail, according to the embodiment to which the present invention is applied, when a disc having music information recorded on a plurality of tracks is reproduced, the sound included in the signal reproduced from the disc is reproduced. The amplitude of the signal is measured, based on this result, it is determined whether or not the signal of the track includes an acoustic signal, and a list of identification information of the tracks determined to not include the acoustic signal is stored. When the disc is played back, the stored identification information is referred to, and for the track whose identification information related to the reproduction target track is included in the identification information stored in the identification information storage means, Is not performed, but the voiced track to be played next is played back. Therefore, it is possible to shorten the silent period due to the silent track during reproduction.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of a disc reproducing apparatus of the present invention.

FIG. 2 is a flowchart showing an example of silence determination processing according to the present invention.

FIG. 3 is a flowchart showing details of a silent track determination process (S49) shown in FIG.

FIG. 4 is a flowchart illustrating a skip reproduction method according to the present invention.

FIG. 5 is a flowchart exemplifying a process of detecting a silent portion at the head of a track according to the present invention.

FIG. 6 is a flowchart illustrating a process of detecting a silent portion at a track end portion according to the present invention.

FIG. 7 is a flowchart illustrating a process of identifying a silent track using a DAC output signal.

8 is a flowchart illustrating a process of measuring Level_Max (maximum acoustic signal level in a track) shown in FIG.

[Explanation of symbols]

13 Playhead 15 RF amplifier 17 Playback head driving means 19 Signal processing means 21 System control means 23 Amplitude measuring means 25 Memory control means 27, 42 memory 29 Digital / Analog Converter (DAC) 31 display means 33 Operation means 41 MPU 43 Silence discrimination means 44 identification information storage means 45 Playback Mode Discrimination Means

   ─────────────────────────────────────────────────── ─── Continued front page    F term (reference) 5D044 AB05 BC03 CC06 FG14 FG16                       FG23 FG30 JJ07                 5D077 AA26 BA10 CA01 CA02 CB06                       DA01 DC09                 5D080 AA07 BA02 DA08 FA02 FA19                       FA20

Claims (9)

[Claims] 1. A disc reproducing apparatus for reproducing a disc in which music information is recorded in a plurality of blocks, wherein an amplitude measuring means for measuring an amplitude of an acoustic signal included in a signal reproduced from the disc, and an inside of the block. Silence discrimination means for discriminating whether or not the signal of FIG. 3 contains an acoustic signal according to the output of the amplitude measuring means, and identification information for storing the identification information of the block discriminated as not containing the acoustic signal by the silence discrimination means. A storage unit, when the disc is reproduced, the identification information stored in the identification information storage unit is referred to, and the identification information of the block is included in the identification information stored in the identification information storage unit. A disc reproducing apparatus characterized in that a voiced block to be reproduced next is reproduced without reproducing the block concerned. 2. A buffer memory for storing a digital signal reproduced from the disc, further comprising a buffer memory stored in the buffer memory when it is determined that a reproduced signal of a certain block does not include an acoustic signal. The disc reproducing apparatus according to claim 1, wherein the reproduction signal of the block is discarded. 3. A buffer memory for storing a digital signal reproduced from the disc, and a D / A converter for converting an acoustic signal read from the buffer memory into an analog signal, wherein the amplitude measuring means comprises the The amplitude of the acoustic signal is measured using the signal before being input to the D / A converter, and the silence determining means determines that the signal of the block is before the signal of the block is output from the D / A converter. If it is determined whether or not the reproduced signal of the block includes the acoustic signal and it is determined that the reproduced signal of the block does not include the acoustic signal, the reproduced signal of the block stored in the memory is output from the D / A converter. 2. The disc reproducing apparatus according to claim 1, wherein the reproducing signal of the voiced block to be output next is output without being output. 4. With respect to a certain block not containing an acoustic signal, the silence determining means determines that the reproduction signal of the block does not include an acoustic signal only when the block length of the block is equal to or more than a predetermined value. The disc reproducing apparatus according to any one of claims 1 to 3, wherein: 5. The disc reproducing apparatus is a compact disc reproducing apparatus, and the identification information is ISRC in a compact disc, or a disc number and a track number. The disc reproducing apparatus described. 6. A step of measuring the amplitude of an acoustic signal included in a signal reproduced from a disc in which music information is recorded in a plurality of blocks, and whether or not the signal of the block includes an acoustic signal is measured. There is a step of determining according to the amplitude, a step of storing identification information of a block determined not to include an acoustic signal in the step, and a step of referring to the identification information stored when playing the disc. However, with respect to a block in which the identification information of the block is included in the stored identification information, the reproduction of the sound block to be reproduced next is performed without reproducing the block. Method. 7. The disk according to claim 6, wherein when it is determined that the reproduction signal of a certain block does not include an acoustic signal, the reproduction signal of the block stored in the buffer memory is discarded. How to play. 8. A certain block which does not include an acoustic signal is characterized in that the reproduction signal of the block is determined not to include an acoustic signal only when the block length of the block is equal to or more than a predetermined value. The disc reproducing method according to claim 6 or 7. 9. The disc reproducing method according to claim 6, wherein the identification information is ISRC in a compact disc, or a disc number and a track number.