JP3812270B2 - Recording medium playback device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a recording medium playback apparatus, and more particularly to a recording medium playback apparatus such as a CD player having a special playback function for remixing music recorded on a recording medium.
[0002]
[Prior art]
Traditionally, using a CD (compact disc) with music recorded, the tempo and key of the music can be changed, the same phrase can be played repeatedly, the favorite phrase can be mixed, and the mixer's crossfader can be used. There is a recording medium playback device used for DJ (disc jockey) or the like that performs original performance for himself by connecting music.
[0003]
Such a recording medium playback device has a sampler function for sampling the phrase in advance and storing it in a memory so that the phrase that the user likes can be mixed during the performance of the song. In the conventional sampler function, a predetermined phrase is sampled as follows. For example, the operation button for starting sampling is pressed at a portion to be sampled during playback of a song. This starts storing a desired phrase in the memory, that is, sample recording. Then, billions of times are recorded until the memory capacity is full. Further, when it is desired to end sampling before the memory is full, a desired phrase is memorized, that is, sample recording is ended by pressing a sampling end operation button at the end of the song.
[0004]
Next, when reproducing the sample recording, the sample reproduction is started from the start portion of the sample recording by pressing the sampling reproduction button, and the sample performance is performed by performing the reproduction up to the end portion of the sample recording. It is also possible to perform a sample recording loop performance by repeatedly reading the sample recording from the memory.
[0005]
[Problems to be solved by the invention]
In a conventional recording medium playback device, when sampling is performed, a sampling start point and an end point are set by a manual operation in which the user presses a sampling start / end operation button while listening to the actually played music. Therefore, it is difficult to set the start point and end point accurately, the inconvenience that the first sound of the phrase starts halfway without the necessary sound being memorized, the last sound is cut off in the middle, Conversely, there was a problem that unnecessary sounds were stored as samples.
[0006]
In particular, if the required sound is not stored, the above operation must be repeated again to record the desired phrase.For example, if the sampling start cannot be set well even if the sampling start can be set successfully. Had to repeat the above operation again, which was very time consuming. Also, since the level of the audio signal changes with time and is not uniform, the sampled sound may be low overall, especially when the set period is short, and the level of the reproduced sound when the sample is played back The problem was very low.
[0007]
The present invention has been made in view of the above points, and an object of the present invention is to provide a recording medium playback apparatus that can easily set and correct the sampling start point and end point and can perform appropriate sampling. And
[0008]
[Means for Solving the Problems]
The invention according to claim 1 is a repeat point setting means for setting a repeat reproduction start point and an end point for repeatedly reproducing a recording medium,
Repetitive reproduction means for repeatedly reproducing the recording medium for a section from the repetitive reproduction start point to the end point;
Repetitive point correcting means for correcting and setting at least one of the repetitive reproduction start point and end point;
And a sampler means for storing all samples memory by sampling the data reproduced from the recording medium for the section to the end point from the repeated reproduction starting point,
Data read from the sample memory is mixed with data being reproduced from the recording medium .
[0009]
Thus, by modifying separately repeated playback start point and the end point is set, repeatedly playing the section from the start point to the end point samples the data reproduced from the recording medium all samples for memory storage Therefore, the setting and correction of the sampling start point and end point can be easily performed, and appropriate sampling can be performed.
[0010]
A second aspect of the present invention provides the recording medium reproducing apparatus according to the first aspect,
Adjustment means for adjusting a reproduction level of data reproduced from the recording medium;
[0011]
In this way, since the reproduction level of data reproduced from the recording medium can be adjusted, the level of data to be sampled can be adjusted in advance and stored in the sample memory at the adjusted appropriate level. Therefore, sample reproduction can be performed at an appropriate level.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a block diagram showing an embodiment of a recording medium reproducing apparatus according to the present invention. In the figure, a CD playback unit 10 rotates a CD (compact disc), which is a recording medium, at a speed twice that of a normal playback speed, and a playback signal of a double speed reproduced from the pickup of the CD playback unit 10 is It is supplied to a CD playback DSP (digital signal processor) in the CD playback section 10 through an RF amplifier, where EFM (Eight to Four Modulation) demodulation and CIRC (Cross Interleave Reed-Solomon Code) Signal processing such as decoding is performed.
[0013]
Further, the subcode is separated from the reproduction signal, and the subcode is decoded. The subcode data is stored in the RAM in the main microcomputer 12 in accordance with a counter signal from the main microcomputer (hereinafter abbreviated as “main microcomputer”) 12. Also, the audio data signal-processed by the CD playback DSP is supplied to the data maintenance DSP 14.
[0014]
The DSP 14 is connected to a DRAM (dynamic RAM) 16 for storing audio data, and the DSP 14 has a role of a memory controller. The DRAM 16 can store the transmitted audio data for about 10 seconds, for example, and provides an anti-shock function for protection when sound skipping occurs due to a defect or the like, and a quick for outputting a desired song instantly. To realize a start function, a seamless loop function for repeatedly playing between two predetermined points, a function for scratching, a function for changing the tempo of a song, a brake function for gradually slowing down the playback speed and stopping the song, etc. Used for.
[0015]
The DSP 14 writes the audio data read at the double speed into the DRAM 16 according to the counter signal from the main microcomputer 12, and simultaneously reads out the audio data at the single speed according to the counter signal from the main microcomputer 12 and supplies it to the DSP 18 for CD sound effect. To do.
[0016]
The DSP 18 is connected to a DRAM 20 as a working memory, and the DSP 18 executes various effect processes such as key (pitch) adjustment, output level adjustment, and voice reduction function for reducing only the vocal volume in the music. The audio data output from the DSP 18 is supplied to the D / A converter 22 through a digital filter and also supplied to the DSP 26 for the sampler effect.
[0017]
A DRAM (dynamic RAM) 28 for storing data is connected to the DSP 26, and the DSP 26 serves as a memory controller. The DRAM 28 can store audio data, for example, for about 10 seconds. The DSP 26 performs sampler processing. Audio data in a period from the sampling start point specified by the user to the sampling end point is stored in the DRAM 28, and the audio data stored at the reproduction timing specified by the user is read and supplied to the D / A converter 30 and supplied to the DSP 18. To do. In the DSP 18, the audio data from the DSP 26 is mixed with the output audio data of its own device and supplied to the D / A converter 22.
[0018]
The main microcomputer 12 has an EPROM (Erasable Programmable ROM) 32 in which programs and data for processing are stored, and an EEPROM in which various setting values such as tempo values and loop points are stored for each song (or track). An (electric erasable programmable ROM) 34 is connected. The clock generator 36 generates a clock signal and supplies it to the CD reproducing unit 10 and the main microcomputer 12.
[0019]
Further, the main microcomputer 12 reads out the subcode from the built-in RAM according to the counter signal and supplies it to the microcomputer (hereinafter referred to as “microcomputer”) 42 of the controller unit 40. The microcomputer 42 converts the subcode into a time code and displays it on the display 44. The controller unit 40 is provided with an operation unit 46 provided with various operation keys operated by the user, and is connected to the microcomputer 42.
[0020]
2 and 3 show functional block diagrams of the DSPs 14, 18, and 26. FIG. In FIG. 2, the comparison connection function 50 of the DSP 14 connects the audio data read at double speed by comparing it with the last data stored in the DRAM 16 based on the control of the counter signal from the main microcomputer 12. The memory write function 51 writes the connected audio data into the DRAM 16. The memory read function 52 reads audio data from the DRAM 16. The tempo function 54 adjusts the tempo by changing the reading speed of the memory read function 52. A fade-in / fade-out function 55 adjusts the level of audio data during fade-in / fade-out.
[0021]
In FIG. 3, a de-emphasis function 60 of the DSP 18 performs a de-emphasis process for restoring the emphasis at the time of CD recording. The key adjustment function 61 variably adjusts the key (pitch) while fixing the tempo. A BPM (beat per minute) function 62 measures the number of beats per minute of the song. The voice reduce function 63 lowers only the vocal volume in the song. The output level adjustment function 64 adjusts the output level. The audio data output from the output level adjustment function 64 is output through the mixing function 65 and supplied to the sampler function 67 of the DSP 26 when the switch 66 is turned on.
[0022]
The sampler function 67 writes audio data to the DRAM 28 and reads audio data from the DRAM 28 when the switch 70 is turned on. The tempo function 68 adjusts the tempo of the audio data supplied from the sampler function 67. The key adjustment function 69 variably adjusts the key (pitch) while fixing the tempo, and then the audio data output from the key adjustment function 69 is output through the switch 70 and at the same time the switch 71 of the DSP 18 (in conjunction with the switch 70). Are supplied to the mixing function 65 and mixed with the audio data from the output level adjustment function 64 and output.
[0023]
Note that the recording medium reproducing apparatus shown in FIG. 1 is a set of two, and the main microcomputer 12 of each recording medium reproducing apparatus operates in conjunction with each other by transmitting and receiving control information to and from each other. FIG. 4 is a plan view of the controller unit 40 of a set of two recording medium reproducing devices. Since the controller unit 40 of each recording medium playback device has the same configuration, only one of them is given a reference numeral in FIG.
[0024]
In FIG. 4, various information including a track number and a time code are displayed on the display unit 80 of the display 44, and the BPM value is displayed on the display unit 81. Also, the preset key 82, jog dial 83, skip key 84, search key 85, play / pause key 86, bank key 87, memory key 88, recall key 89, enter key 90, TAP key 91, BPM key 92, Tempo SYNC key 93, beat SYNC key 94, loop key 95, A key 96, B key 97, sample key 98, IN key 99, OUT key 100, tempo key 101, tempo volume 102, scratch key 103, brake key 104, numeric key 105 Etc. are provided.
[0025]
In the present invention, as in the prior art, instead of recording the sample by pressing the sampling start operation button at the part to be sampled during song playback and pressing the sampling end operation button at the part to end the song, the loop point is set. A loop is played between the set loop points, the loop points are corrected if necessary, and the corrected loop points are reproduced and sampled.
[0026]
FIG. 5 shows a flowchart of an embodiment of the loop point setting process. First, when the preset key 82 and the jog dial 83 are operated in step S10 to select the loop mode and the enter key 90 is pressed, the loop mode is set in step S12. Next, in step S14, it is determined whether or not the A key 96 is pressed and turned on. When the A key 96 is pressed and turned on, the process proceeds to step S16, and the current position is set as a point A which is a loop start point. Save settings. Next, the process proceeds to step S18, where it is determined whether playback is in progress or pause. If the reproduction is in progress, the process proceeds to step S22. If the reproduction is paused, the process proceeds to step S20. After confirming that the frame has been advanced by the operation of the jog dial or the like, the process proceeds to step S22. Next, in step S22, it is determined whether or not the B key 97 is pressed and turned on. If the B key 97 is pressed and turned on, the process proceeds to step S24, and the current playback position is set to the loop end point B. Set and store as a point.
[0027]
FIG. 6 shows a flowchart of an embodiment of the loop performance process. First, when the loop key 95 is pressed and turned on in step S26, the process proceeds to step S28 to determine whether or not reproduction is in progress. If playback is in progress, the process proceeds to step S30 to determine whether or not the loop mode is set. If it is not the loop mode, this process is terminated, and if it is the loop mode, the process proceeds to step S32 to move the CD playback position to the point A which is the loop start point.
[0028]
Next, in step S34, it is confirmed whether or not the loop key is on. In step S36, it is determined whether or not the reproduction position of the CD has arrived at the point B. The playback position is moved to point A and this is repeated. If it is determined in step S34 that the loop key 95 is off, this process is terminated. By executing this loop performance process, it is possible to check whether there is an inconvenience that the first sound of the phrase starts in the middle or the last sound is cut off in the middle without storing the necessary sound. . Furthermore, when the level of the playback sound of the loop performance is very low, the level of the playback sound can be increased by the output level adjustment function 64.
[0029]
FIG. 7 shows a flowchart of an embodiment of the loop point correction process. First, when the A key 96 or the B key 97 is double-clicked in step S40, if the double-click is the A key 96, the loop start point is corrected, and if the B key 97 is the loop end point is corrected. In step S44, the CD playback position is moved to point A or point B to be corrected.
[0030]
Next, the movement is paused at point A or point B moved in step S46, and the time address at that position is displayed on the display unit 80 in step S48. Next, in step S48, correction of point A or point B by the user rotating the jog dial 83 is accepted. When the jog dial 83 is rotated counterclockwise, the point A or B is delayed (time address value is decreased), and when it is rotated clockwise, the point A or B is advanced (time address value is increased). Also, playback sound is output as the jog dial rotates. Therefore, the correction position can be confirmed not only by the time address but also by the reproduced sound. When the correction operation is completed and the user clicks the A key 96 or B key 97, this is determined in step S52, and the process proceeds to step S54 where the corrected point A or point B is updated as a new point A or point B. Is done.
[0031]
FIG. 8 shows a flowchart of an embodiment of the sampling process. First, when the B key 97 and the OUT key 100 are simultaneously pressed and turned on in step S56, it is determined in step S58 whether a loop has already been set, that is, whether points A and B are stored. If the loop is not set, this process is terminated, and if the loop is set, the process proceeds to step S60.
[0032]
In step S60, the reproduction position of the CD is moved to point A and reproduction is started from point A, and the audio data reproduced in step S62 is stored in the DRAM 28. Next, in step S64, it is determined whether or not the CD playback position has reached point B. If it has not reached point B, it is determined in step S66 whether playback has started from point A and 10 seconds have elapsed. To do. This 10 seconds is a value corresponding to the capacity of the DRAM 28. If 10 seconds have not elapsed, the process proceeds to step S64. If the CD playback position has reached point B, or if 10 seconds have elapsed, the process proceeds to step S68, and sampling is terminated.
[0033]
In this way, the loop start point and end point are set, the loop performance is performed between the set loop start point and end point, and the loop start point and end point are corrected if necessary. Since the loop start point and end point are reproduced and stored in the DRAM 28 for sampling, a desired phrase can be reliably sampled.
[0034]
In the device of the present invention, as in the past, during playback of a song, the IN key 99 that instructs sampling to be turned on is pressed to turn it on, and the OUT key 100 that instructs to end sampling is pressed at the portion where the song is desired to end. It is also possible to record the sample by storing the audio data during this period in the DRAM 28.
[0035]
In the above embodiment, a CD is used as the recording medium, but other recording media such as a DVD (digital versatile disk), MD (mini disk), memory stick, and flash memory are used instead of the CD. However, the present invention is not limited to the above embodiment.
[0036]
Note that steps S10 to S24 correspond to the repetitive point setting means described in the claims, steps S26 to S36 correspond to the repetitive reproduction means, steps S40 to S54 correspond to the repetitive point correcting means, and the DRAM 28 serves as the sample memory. Correspondingly, steps S56 to S68 correspond to the sampler means, and the output level adjustment function 64 corresponds to the level adjustment means.
[0037]
【The invention's effect】
As described above, according to the first aspect of the present invention, the data reproduced from the recording medium in the section from the repeat reproduction start point to the end point is corrected by separately correcting the set repeat reproduction start point and end point. Since all the samples are sampled and stored in the sample memory, the sampling start point and end point can be easily set and corrected, and appropriate sampling can be performed.
[0038]
In addition, since the reproduction level of the data reproduced from the recording medium can be adjusted, the level of the data to be sampled can be adjusted in advance and the adjusted appropriate level can be obtained. Since the level is stored in the sample memory, the sample reproduction can be performed at an appropriate level.
[Brief description of the drawings]
FIG. 1 is a block diagram of an embodiment of a recording medium playback apparatus of the present invention.
FIG. 2 is a functional block diagram of a DSP 14;
FIG. 3 is a functional block diagram of DSPs 18 and 26;
FIG. 4 is a plan view of a controller unit 40 of a recording medium reproducing apparatus according to the present invention in a set of two.
FIG. 5 is a flowchart of an embodiment of a loop point setting process.
FIG. 6 is a flowchart of an embodiment of a loop performance process.
FIG. 7 is a flowchart of an embodiment of a loop point correction process.
FIG. 8 is a flowchart of an embodiment of a sampling process.
[Explanation of symbols]
10 CD player 12 Main microcomputer 14 DSP 14 for data maintenance
16, 20, 28 DRAM
18 DSP sound effect DSP18
22,30 D / A converter 26 DSP26 for sampler effect
32 EPROM
34 EEPROM
36 Clock generator 40 Controller unit 42 Microcomputer 44 Display 46 Operation unit

Claims (2)

Repetitive point setting means for setting a repetitive reproduction start point and end point for repetitively reproducing the recording medium;
Repetitive reproduction means for repeatedly reproducing the recording medium for a section from the repetitive reproduction start point to the end point;
Repetitive point correcting means for correcting and setting at least one of the repetitive reproduction start point and end point;
Sampler means for sampling the data reproduced from the recording medium for the section from the repeat reproduction start point to the end point, and storing all the data in the sample memory ;
A recording medium reproducing apparatus , wherein data read from the sample memory is mixed with data being reproduced from the recording medium. The recording medium playback device according to claim 1,
A recording medium reproducing apparatus comprising adjusting means for adjusting a reproduction level of data reproduced from the recording medium.

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