JP3846122B2 - Playback control device and medium - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an audio data playback control apparatus capable of freely changing the playback tempo of audio data.
[0002]
[Prior art]
In an electronic musical instrument such as a sampler or a musical sound signal processing device, a time stretch process is performed to compress or expand the time axis of a musical sound signal waveform without changing the pitch of the musical sound, thereby changing the reproduction time of the musical sound signal. Yes.
[0003]
Time stretching is a process of compressing or expanding / contracting the time axis without changing the pitch by thinning out or interpolating the audio signal. To shorten the reproduction time, the audio signal is thinned out, and to increase the reproduction time, the audio signal is interpolated.
[0004]
An electronic musical instrument such as a sampler or a musical tone signal processing apparatus is not intended for reproducing a piece of data, and therefore basically does not have timing data that is tempo information. For this reason, it is difficult to use it for the purpose of controlling the reproduction of one song.
[0005]
In addition, regarding an audio data playback control device capable of changing the playback tempo of one piece of audio data, a tempo signal related to the speed of the audio data in one channel of the two-channel tape and in the other channel. Japanese Patent Laid-Open No. 55-67967 discloses a technique for controlling the tape playback speed by comparing the tempo signal with a touch signal input at a predetermined interval from the user.
[0006]
[Problems to be solved by the invention]
If the playback speed is simply changed as in the conventional audio data playback control device, the pitch changes accordingly, which is different from the pitch at the time of recording. In addition, it is required to reproduce the tempo information once input at the next reproduction. Furthermore, it is required to recognize a musical score describing tempo changes and to control the playback tempo based on the recognition result. There is also a need for an audio data playback control device that can change the playback speed without changing the pitch, such as a sampler.
[0007]
An object of the present invention is to provide an audio data reproduction control device capable of freely changing the reproduction tempo of audio data.
[0008]
Another object of the present invention is to control the playback tempo by storing tempo information once input and comparing the tempo information stored at the next playback with the tempo signal stored in advance together with the audio data. It is an object of the present invention to provide an audio data reproduction control apparatus capable of performing the above.
[0009]
Furthermore, another object of the present invention is to provide an audio data reproduction control device capable of recognizing a musical score describing tempo changes and controlling the reproduction tempo based on the recognition result. That is.
[0010]
[Means for Solving the Problems]
According to one aspect of the present invention, an audio data reproduction control apparatus recognizes a score image and a storage unit that stores audio data and timing data for each beat or measure corresponding to the progress of the audio data, and recognizes a result of the recognition. Timing signal generating means for generating a timing signal for each beat or measure based on the above, reading means for reading the audio data and timing data for each beat or measure, the generated timing signal and the read timing data Comparing means for judging whether or not they coincide with each other in time, and changing the pitch so that the progress of the audio data coincides with the generated timing signal in accordance with the judgment result. And control means for controlling the playback tempo of the audio data.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a block diagram showing a configuration of an audio data reproduction control apparatus.
[0014]
The audio data reproduction control device 1 includes an audio data storage unit 2, a reading / reproducing unit 7, a timing input unit 3, a timing recording / reproducing unit 4, a score image input unit 5, and a score recognition / timing generation unit 6. The D / A converter 8 may be included.
[0015]
The audio data storage unit 2 stores audio data in a recording medium such as an optical disk such as a CD-ROM, a magneto-optical disk such as an MO, a magnetic disk such as a hard disk, a semiconductor memory such as ROM or RAM, and a magnetic tape.
[0016]
In addition, the recording medium may be a cache memory that temporarily stores audio data stream-distributed via a network. Stream distribution is a type in which batch download downloads audio data for one song or multiple songs from another computer via a network, while playing a part of the data as soon as it is received. Download format. In the case of stream distribution using a cache memory, the entire music piece is not stored at a time, but considering the passage of time, it is considered that one music piece is stored as a result.
[0017]
The audio data storage unit 2 stores one or more pieces of digital audio data. The audio data is composed of waveform data and timing data indicating the position of the timing in the audio data at every predetermined timing (for example, every beat or every measure). The timing data storage format will be described later.
[0018]
The audio data stored in the audio data storage unit 2 may be stored in advance or may be stored audio data input from the outside. Further, it may be downloaded from another computer via a network. The stored audio data may be any data that is reproduced based on a certain tempo, such as musical instrument performance and singing. Further, timing data is added to audio data having no timing data by a method described later.
[0019]
The read / play unit 7 reads out and outputs the audio data stored in the audio data storage unit 2. This output may be performed in a digital format or may be performed after being converted into an analog format. The configuration of the reading / reproducing unit 7 will be described later.
[0020]
At this time, the output tempo of the audio data can be controlled in real time based on a timing signal from any of the timing input unit 3, the timing recording / reproducing unit 4, and the score recognition / timing generating unit 6. At this time, the tempo changes, but the pitch does not change and remains unchanged.
[0021]
The timing input unit 3 is a hand controller or a command bar type operator (for example, Japanese Patent Laid-Open No. Hei 8) in which a player (conductor) swings by hand using a switch input of a keyboard or a mouse, an acceleration sensor, a gyro sensor, or the like. -305334 (operator described in the embodiment), timing signal at every predetermined timing (every beat or every bar) in accordance with image recognition by imaging the operation such as operation, command, voice input by microphone, etc. Enter. The input timing may be arbitrarily selected by the user, for example, every beat or every measure. The timing signal input from the timing input unit 3 is output to the timing recording / reproducing unit 4 or directly to the reading / reproducing unit 7. Further, when nothing is input, a timing signal having the same synchronization as the timing signal input up to the previous time may be automatically generated.
[0022]
The timing recording / reproducing unit 4 records the timing signal input from the timing input unit 3 in time series, for example, one piece of music on a recording medium, and reads and reproduces the timing signal recorded later. The recording medium for recording the timing signal is the same as that of the audio data storage unit 2.
[0023]
Note that the timing signal to be recorded / reproduced is not limited to one corresponding to one audio data, and there may be a plurality of types of timing signals corresponding to one audio data.
[0024]
In this way, it is possible to reproduce the same audio data at different tempos (changing the tempo). If a timing signal corresponding to the audio data is stored in advance, it may be reproduced only. Furthermore, the playback tempo of the timing signal sequence may be changed before or during playback.
[0025]
The data recorded in the audio data storage unit 2 and the timing recording / reproducing unit 4 may be recorded on a recording medium in a continuous area in time series, or scattered and stored in a discrete area separately. You may manage as continuous data. That is, it is only necessary to manage the data as time-sequential data, and it does not matter whether the data is continuously recorded on the recording medium.
[0026]
The score image input unit 5 reads a printed or handwritten score by a scanner or the like, and creates and inputs a score image. Alternatively, a score image that has already been read and recorded on a recording medium may be input. Note that the score read here is a score corresponding to the audio data recorded in the audio data storage unit 2. The input score image is output to the score recognition / timing generator 6.
[0027]
The score recognition / timing generator 6 analyzes the input score image and recognizes notes and various music symbols. A technique for recognizing a musical score is known, and is recognized by, for example, a method disclosed in an embodiment of Japanese Patent Laid-Open No. 6-332443. Then, a timing signal is generated for each predetermined timing (every beat or every bar) based on the music symbols related to time signature and tempo change among the recognized music symbols.
[0028]
For example, if it is recognized that “tempo = 120, 4/4 time signature”, when generating a timing signal for each beat, the timing signal is generated every 0.5 seconds, and for each bar, 2 is used. Generate every second. When “Rit. (Ritardando)” is recognized as the tempo change symbol, the timing signal cycle is gradually lengthened, and when “Acc. (Accelerando)” is recognized, the timing signal cycle is gradually increased. Keep it short. For other time signatures and symbols related to tempo changes, timing signals are also generated so as to correspond to them. The timing signal generated here is sent to the reading / reproducing unit 7. The generated timing signal may be output to the timing recording / reproducing unit 4 and recorded on a recording medium, and read / reproduced later.
[0029]
The D / A converter 8 converts the output of the read / reproducer 7 from digital data to an analog signal. The output of the reading / reproducing unit 7 may be output as digital data without going through the D / A converting unit 8.
[0030]
FIG. 2 is a configuration diagram illustrating an example of a storage format of audio data.
[0031]
The audio data AD is stored in various formats such as a format in which the waveform sample data SD and the timing data TD are mixed and a format in which the waveform sample data SD and the timing data TD are separately stored and managed. be able to.
[0032]
FIG. 2A is a configuration diagram showing an example of a storage format of audio data AD in which waveform sample data SD and timing data TD are mixed and stored.
[0033]
When the waveform sample data SD and the timing data TD are mixed, the timing data TD is stored at a position corresponding to a predetermined timing such as every beat or every measure. Between one timing data TD1 and the next timing data TD2, waveform sample data SD for the predetermined timing interval is stored.
[0034]
FIG. 2B is a configuration diagram showing an example of a storage format of audio data AD for separately storing and managing the waveform sample data SD and the timing data TD.
[0035]
In the case of this format, the waveform sample data SD is continuously stored. The timing data TD is stored as data indicating the position information of the waveform sample data SD corresponding to each timing at a predetermined timing, separately from the arrangement of the waveform sample data SD. The position information in this case is the storage address of the waveform sample data SD corresponding to the predetermined timing, the number of samples, and the like.
[0036]
FIG. 3 is a block diagram illustrating an example of a method for simultaneously recording an audio signal and a timing signal. In this example, the timing signal is recorded in a superimposed manner in the non-audible band of the audio signal.
[0037]
FIG. 3A is a block diagram showing a method for recording a timing signal in a superimposed manner in the non-audible band of the audio signal.
[0038]
The timing signal TS is, for example, a sine wave having one beat or one bar as one cycle. This is sent to the modulation unit 12 a, modulated with a modulated wave of a non-audible band or lower (for example, 20 Hz), noise is removed by a low-pass filter (LPF) 13, and then supplied to the mixing unit 15.
[0039]
The audio signal AS is supplied to the mixing unit 15 after the high-frequency filter (HPF) 14 removes the inaudible band or less (20 Hz or less).
[0040]
The modulated timing signal TS and audio signal AS are mixed by the mixing unit 15 and converted from analog signals to digital data by the A / D conversion unit 16a. Thereafter, it is stored as audio data in the audio data storage unit 2 as audio data.
[0041]
FIG. 3B is a block diagram showing a method for reproducing the audio data recorded by the above method.
[0042]
The audio data stored in the audio data storage unit 2 is read out and sent to the D / A conversion unit 16b where it is D / A converted into an analog signal. Thereafter, it is sent to the HPF 14 and the LPF 13.
[0043]
The analog signal sent to the HPF 14 is removed from the non-audible band or less (depending on the setting at the time of recording. Here, 20 Hz or less) and output as the audio signal AS.
[0044]
From the analog signal sent to the LPF 13, only the signal in the inaudible band is extracted and sent to the demodulator 12b. The demodulator 12b demodulates the signal extracted by the LPF 13 with the signal (20 Hz) used at the time of recording and outputs it as a timing signal TS.
[0045]
An example of a method for adding the timing data TD to the waveform data SD will be described below. This can be carried out when storing in any of the above storage formats. Further, the method of adding the timing data TD to the waveform data SD is not limited to the following.
[0046]
(1) When recording a music sound (musical instrument performance, singing, etc.), a timing signal is generated by an operation (for example, a switch operation) of a person who is listening to the music, and the generated timing signal is recorded as data. Recording at the same time. As a method for generating a timing signal by a human operation, for example, a tempo controller disclosed in the embodiment of Japanese Utility Model Laid-Open No. 4-77196 can be used.
[0047]
(2) When a sound of a music is once recorded on a recording medium and reproduced, a timing signal is generated by an operation (for example, a switch operation) of a person who listens to the sound, and the generated timing signal is used as data. A method of additionally recording on a recording medium.
[0048]
(3) A method in which after a sound of a music is once recorded on a recording medium, it is analyzed to automatically extract a predetermined timing, and the extracted timing signal is additionally recorded as data on the recording medium. Various automatic extraction methods are conceivable, such as measuring the time interval between a strong beat and the next strong beat and calculating the tempo.
[0049]
(4) A method of correcting the timing data recorded in (1) to (3) before and after by a human operation. For example, the timing signal is converted into sound and corrected while listening. Further, for example, it is possible to make corrections by various methods such as converting the sound and timing signal of the music into display data and converting it while viewing it.
[0050]
FIG. 4 is a block diagram showing a configuration of the reading / reproducing unit 7.
[0051]
The read / playback unit 7 includes a read control unit 9 and a comparison unit 10, and may further include a pitch conversion unit 11.
[0052]
The read control unit 9 has a time stretch circuit and reads the audio data AD from the audio data storage unit 2. Of the read audio data AD, the timing data TD is sent to the comparison unit 10. Further, the waveform sample data SD is reproduced in accordance with an instruction from the comparison unit 10.
[0053]
The read control unit 9 can change the reproduction speed in response to an instruction from the comparison unit 10. Since the pitch changes when the reproduction speed is changed, the waveform data is sent to the pitch converter 11 arranged in the subsequent stage and corrected to the pitch at the time of recording.
[0054]
When the reproduction speed is not changed, the waveform data is skipped by the time stretch process, and duplicate reading is performed. In this case, since the pitch of the waveform data does not change, the pitch conversion unit 11 is not required or is output without going through the pitch conversion unit 11.
[0055]
In response to an instruction from the comparison unit 10 or when there is no new instruction, the same processing as the previous time may be repeated until the next instruction is issued, or the previous tempo may be restored. Therefore, normal reading / reproduction may be performed. Basically, processing continues until a new instruction is received.
[0056]
The comparator 10 receives the timing data TD and compares it with the input timing signal. In accordance with the comparison result, the readout control unit 9 is instructed to perform duplicate reading, skip reading, or change the reading speed. The pitch converter 11 is instructed to convert the pitch. The processing in the comparison unit 10 will be described later using a flowchart.
[0057]
The pitch conversion unit 11 converts the pitch by the pitch conversion process according to the instruction of the comparison unit 10, and outputs the waveform data with the same pitch as that during recording. In the pitch conversion process, the target audio signal and waveform data are sequentially sampled at a predetermined frequency, and the sampled data is written to a random access memory (RAM) and read at a frequency different from that at the time of writing. Change the pitch. In response to an instruction from the comparison unit 10 or when there is no new instruction, the same processing as the previous time may be repeated until the next instruction is issued, or the original pitch may be restored. Therefore, normal playback may be performed.
[0058]
FIG. 5 is a flowchart showing an interrupt process performed by the comparison unit 10 when the reading speed of the waveform sample data SD is constant. The interrupt process is performed at predetermined time intervals according to the timer. This time interval can be set arbitrarily.
[0059]
In step SA1, the presence / absence of a timing signal is detected. If there is an input within the predetermined time, the process proceeds to the next step SA2 indicated by an arrow “YES”. If there is no input within the predetermined time, the process proceeds to step SA5 indicated by an arrow “NO”. When there is no input, the process may proceed to step SA6 indicated by a dotted arrow. Whether to proceed to step SA5 or step SA6 may be appropriately selected by the user. If the tempo once input is to be reflected in subsequent reproduction, it is selected to proceed to step SA5, and if the input tempo is a temporary change, the process proceeds to step SA6. If no timing signal is input, the process may proceed to step SA7 as indicated by a broken line.
[0060]
In step SA2, it is detected whether the input timing signal and the timing data TD in the audio data AD sent from the corresponding read control unit 9 are temporally coincident.
[0061]
Here, the term “match” means that the timing signal and the corresponding timing data TD are simultaneously input to the comparison unit 10. The case where they do not coincide is a case where one of the timing signal and the timing data TD corresponding thereto is input to the comparison unit 10 earlier or later than the other in terms of time.
[0062]
If they match, the process proceeds to the next step SA5 indicated by the arrow “JUST”. When the timing signal is input with a delay from the corresponding timing data TD, the process proceeds to step SA3 indicated by an arrow “BEHIND”. When the timing signal is input first with respect to the corresponding timing data TD, the process proceeds to step SA4 indicated by the arrow “FAST”.
[0063]
In step SA3, the readout control unit 9 is instructed to reproduce the audio data AD by duplicate readout. Overlapping readout is to continuously read out the same waveform sample data and lengthen the reproduction time without changing the pitch. Thus, the playback tempo of the audio data AD is delayed so as to match the tempo of the input timing signal. In the time stretch processing performed here, a desired reproduction time is calculated based on the difference or ratio between the tempo of the timing signal and the timing data TD so as to match the tempo of the timing signal in real time. Thereafter, the process proceeds to next Step SA7.
[0064]
In step SA4, the read controller 9 is instructed to reproduce the audio data AD by skipping. In skipping, a part of the waveform sample data SD is skipped without being played back, thereby shortening the playback time without changing the pitch. Thus, the playback tempo of the audio data AD is accelerated so as to match the tempo of the input timing signal. In the time stretch processing performed here, a desired reproduction time is calculated based on the difference or ratio between the tempo of the timing signal and the timing data TD so as to match the tempo of the timing signal in real time. Thereafter, the process proceeds to next Step SA7.
[0065]
In step SA5, the read control unit 9 is instructed to perform the same operation as the previous instruction. That is, the reproduction is continued while maintaining the tempo changed by the input of the timing signal. This is because, for example, if the previous instruction is to skip skipping playback, more waveform sample data SD is not skipped, but playback is performed at the playback speed changed by the previous instruction. Is to do. Thereafter, the process proceeds to next Step SA7.
[0066]
In step SA6, the read control unit 9 is instructed to normally reproduce the audio data AD. Here, the normal reproduction is reproduction in accordance with the tempo at the time of recording the audio data AD, and means that duplicate reading or skipping is not performed. That is, no time-series processing is performed. Thereby, the tempo change by the input timing signal is initialized. Thereafter, the process proceeds to next Step SA7.
[0067]
In step SA7, the comparison unit process is restarted to repeat from step SA1. By repeating the above comparison unit processing, it is possible to always monitor the timing signal input. This also makes it possible to immediately match the tempo of the timing signal when a timing signal is input. In other words, the comparison unit process enables reproduction according to a desired tempo according to the input state of the timing signal.
[0068]
FIG. 6 is a flowchart illustrating an interrupt process performed by the comparison unit 10 when the reading speed of the waveform sample data SD is variable. The interrupt process is performed at predetermined time intervals according to the timer. This time interval can be set arbitrarily.
[0069]
In step SB1, whether or not a timing signal is input is detected. If there is an input within a predetermined time, the process proceeds to the next step SB2 indicated by the arrow “YES”. If there is no input within the predetermined time, the process proceeds to step SB7 indicated by the “NO” arrow. When there is no input, the process may proceed to step SB9 indicated by a dotted arrow. The user may appropriately select whether to proceed to step SB7 or step SB9. If the tempo once input is to be reflected in subsequent reproduction, it is selected to proceed to step SB7, and if the input tempo is a temporary change, the process proceeds to step SB9. Further, when there is no timing signal input, the process may proceed to step SB11 as indicated by a broken line.
[0070]
In step SB2, it is detected whether the input timing signal and the timing data TD in the audio data AD sent from the corresponding read control unit 9 are temporally coincident. Here, the term “match” means that the timing signal and the corresponding timing data TD are simultaneously input to the comparison unit 10. The case where they do not coincide is a case where one of the timing signal and the timing data TD corresponding thereto is input to the comparison unit 10 earlier or later than the other in terms of time. If they match, the process proceeds to the next step SB7 indicated by the arrow “JUST”. When the timing signal is input with a delay from the corresponding timing data TD, the process proceeds to step SB3 indicated by an arrow “BEHIND”. If the timing signal is input first with respect to the corresponding timing data TD, the process proceeds to step SB5 indicated by the arrow “FAST”.
[0071]
In step SB3, the readout control unit 9 is instructed to reduce the reproduction speed of the audio data AD. Thus, the playback tempo of the audio data AD is delayed so as to match the tempo of the input timing signal. Here, the so-called time stretch process is not performed, and the playback speed is merely slowed down. For this reason, the pitch decreases as the playback speed is reduced. In order to return this to the recording pitch, the process proceeds to the next step SB4.
[0072]
In step SB4, the pitch converter 11 is instructed to increase the pitch of the audio data AD. The instruction issued here is an instruction to perform pitch conversion so that the pitch after pitch conversion is the same as the pitch at the time of recording. Thereafter, the process proceeds to next Step SB11.
[0073]
In step SB5, the read control unit 9 is instructed to increase the reproduction speed of the audio data AD. Thus, the playback tempo of the audio data AD is accelerated so as to match the tempo of the input timing signal. Here, the so-called time stretch process is not performed, and the playback speed is merely increased. For this reason, the pitch is increased by increasing the reproduction speed. In order to return this to the pitch at the time of recording, the process proceeds to the next step SB6.
[0074]
In step SB6, the pitch conversion unit 11 is instructed to lower the pitch of the audio data AD. The instruction issued here is an instruction to perform pitch conversion so that the pitch after pitch conversion is the same as the pitch at the time of recording. Thereafter, the process proceeds to next Step SB11.
[0075]
In step SB7, the read control unit 9 is instructed to perform or maintain the same operation as the previous instruction. That is, the reproduction is continued while maintaining the tempo changed by the input of the timing signal. For example, when the previous instruction is to increase the reproduction speed, the reproduction speed is not increased further, but the reproduction is performed at the reproduction speed changed by the previous instruction. Next, go to step SB8
In step SB8, the pitch converter 11 is instructed to perform or maintain the same operation as the previous instruction. For example, when the previous instruction is to increase the pitch, the pitch is not increased further, but is reproduced with the pitch changed according to the previous instruction. Thereafter, the process proceeds to next Step SB11.
[0076]
In step SB9, the read control unit 9 is instructed to normally reproduce the audio data AD. Here, normal playback is playback in accordance with the tempo at the time of recording the audio data AD, and means that the playback speed is not changed. That is, no time-series processing is performed. Thereby, the tempo change by the input timing signal is initialized. Further, the process proceeds to the next step SB10.
[0077]
In step SB10, the pitch conversion unit 11 is instructed not to perform pitch conversion. Thereafter, the process proceeds to next Step SB11.
[0078]
In step SB11, the comparison unit process is restarted to repeat from step SB1. By repeating the above comparison unit processing, it is possible to always monitor the timing signal input. This also makes it possible to immediately match the tempo of the timing signal when a timing signal is input. In other words, the comparison unit process enables reproduction according to a desired tempo according to the input state of the timing signal.
[0079]
FIG. 7 is a diagram showing a specific hardware configuration of a general-purpose computer or personal computer 20 constituting the playback control apparatus 1.
[0080]
A configuration of the general-purpose computer or the personal computer 20 will be described. The bus 21 includes a CPU 22, a RAM 23, an external storage device 24, a MIDI interface 25 for transmitting / receiving MIDI data to / from the outside, a sound card 26, a ROM 27, a display device 28, an input means 29 such as a keyboard, a switch and a mouse, A communication interface 30 and an expansion slot 31 for connecting to the Internet are connected.
[0081]
The sound card 26 includes a buffer 26a and a codec circuit 26b. The buffer 26a buffers data for input or output to the outside. The codec circuit 26b includes an A / D converter and a D / A converter, and can convert between an analog format and a digital format. Further, the codec circuit 26b includes a compression / decompression circuit, and can compress and decompress data.
[0082]
The external storage device 24 is, for example, a hard disk drive, a floppy disk drive, a CD-ROM drive, a magneto-optical disk drive, or the like, and can store MIDI data, audio data, image data, a computer program, or the like.
[0083]
The ROM 27 can store computer programs and various parameters. The RAM 23 has a working area such as a buffer or a register, and can copy and store the contents stored in the external storage device 24.
[0084]
The CPU 22 performs various calculations or processes according to the computer program stored in the ROM 27 or the RAM 23. The system clock 32 generates time information. The CPU 22 can obtain time information from the system clock 32 and perform timer interrupt processing.
[0085]
A communication interface 30 of a general-purpose computer or personal computer 20 is connected to the Internet line 33. The communication interface 30 is an interface for transmitting and receiving MIDI data, audio data, image data, computer programs, and the like over the Internet.
[0086]
A MIDI sound source 35 is connected to the MIDI interface 25, and an audio output device 36 is connected to the sound card 26. Further, a sound input device (not shown) may be connected to the sound card 26. Further, the MIDI sound source 35 may be connected to the audio output device 36. The CPU 22 receives MIDI data, audio data, image data, a computer program, and the like from the Internet line 33 via the communication interface 30.
[0087]
In addition to the Internet interface, the communication interface 30 may be an Ethernet interface, an IEEE 1394 standard digital communication interface, or an RS-232C interface, and can be connected to various networks.
[0088]
The general-purpose computer or personal computer 20 stores a computer program for receiving and reproducing audio data. By storing computer programs and various parameters in the external storage device 24 and reading them into the RAM 23, it is possible to easily add or upgrade computer programs.
[0089]
A CD-ROM (compact disk-read only memory) drive is a device that reads a computer program or the like stored in a CD-ROM. The read computer program or the like is stored in the hard disk. New installation and version upgrade of computer programs can be done easily.
[0090]
The communication interface 30 is connected to a communication network 33 such as a LAN (local area network), the Internet, or a telephone line, and is connected to another computer 34 via the communication network 33.
[0091]
When the above computer program or the like is not stored in the external storage device 24, the computer program or the like can be downloaded from the computer 34. The general-purpose computer or personal computer 20 transmits a command for requesting download of a computer program or the like to the computer 34 via the communication interface 30 and the communication network 33.
[0092]
The computer 34 receives this command and distributes the requested computer program or the like to the general-purpose computer or the personal computer 20 via the communication network 32. The general-purpose computer or personal computer 20 receives a computer program or the like via the communication interface 30 and stores it in the external storage device 24, whereby the download is completed.
[0093]
Note that this embodiment may be implemented by a commercially available general-purpose computer or personal computer installed with a computer program or the like corresponding to this embodiment.
[0094]
In that case, the computer program or the like corresponding to the present embodiment may be provided to the user in a state of being stored in a storage medium that can be read by the computer, such as a CD-ROM or a floppy disk.
[0095]
When the general-purpose computer or personal computer is connected to a communication network such as a LAN, the Internet, or a telephone line, the computer program and various data are provided to the general-purpose computer or personal computer via the communication network. May be.
[0096]
Also, before playing back the audio data, compare the timing data in the audio data with the recorded timing signal, create the audio data with the changed tempo, and then play back the audio data with the changed tempo You may make it do.
[0097]
Although the present invention has been described with reference to the embodiments, the present invention is not limited thereto. It will be apparent to those skilled in the art that various modifications, improvements, combinations, and the like can be made.
[0098]
【The invention's effect】
As described above, according to the present invention, the reproduction tempo of audio data can be freely changed without changing the pitch.
[0099]
In addition, it is possible to control the playback tempo by storing the tempo information once input and comparing the tempo information stored at the next playback with the tempo signal stored in advance together with the audio data.
[0100]
Furthermore, it is possible to recognize a musical score describing tempo changes and the like, and to control the playback tempo based on the recognition result.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a configuration of an audio data reproduction control device.
FIG. 2 is a diagram showing an example of a storage format of audio data.
FIG. 3 is a block diagram illustrating an example of a method for storing audio data.
FIG. 4 is a block diagram showing a configuration of a read / playback unit.
FIG. 5 is a flowchart showing processing in a comparison unit.
FIG. 6 is a flowchart showing processing in a comparison unit.
FIG. 7 is a block diagram illustrating a specific hardware configuration of a general-purpose computer or a personal computer.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Playback control apparatus, 2 ... Audio data storage part, 3 ... Timing input part, 4 ... Timing recording / reproduction part, 5 ... Musical score image input part, 6 ... Musical score image recognition / timing generation part, 7 ... Reading / reproduction part 8 ... D / A converter, 9 ... reading controller, 10 ... comparator, 11 ... pitch converter, 12a ... modulator, 12b ... demodulator, 13 ... LPF, 14 ... HPF, 15 ... mixing unit, 16a ... A / D, 16b ... D / A converter, 20 ... general-purpose computer or personal computer, 21 ... bus, 22 ... CPU, 23 ... RAM, 24 ... external storage device, 25 ... MIDI interface, 26 ... sound card, 26a ... buffer, 26b ... codec circuit, 27 ... ROM, 28 ... display device, 29 ... input means, 30 ... communication interface 30, 31 expansion slot ... 3 ... system clock, 33 ... communication network, 34 ... computer, 35 ... MIDI sound source 36 ... sound output unit

Claims (9)

Storage means for storing audio data and timing data for each beat or measure corresponding to the progress of the audio data;
Timing signal generating means for recognizing a score image and generating a timing signal for each beat or measure based on the recognition result;
Reading means for reading out the audio data and timing data for each beat or measure;
Comparing means for comparing the generated timing signal and the read timing data to determine whether they coincide in time;
Control means for controlling the playback tempo of the audio data without changing the pitch so that the progress of the audio data coincides with the generated timing signal in time according to the determination result;
An audio data playback control device.   2. The reproduction of audio data according to claim 1, wherein the control means for controlling the reproduction tempo controls the reproduction tempo without changing the pitch by making the reading speed of the audio data constant and repeatedly reading or skipping the audio data. Control device.   The control means for controlling the playback tempo controls the playback tempo without changing the pitch by changing the read speed of the audio data and canceling out the change in pitch due to the change by pitch conversion. Audio data playback control device. A storage procedure for storing audio data and timing data for each beat or measure corresponding to the progress of the audio data;
A timing signal generation procedure for recognizing a score image and generating a timing signal for each beat or measure based on the recognition result;
A readout procedure for reading out the audio data and timing data for each beat or measure;
A comparison procedure for comparing the generated timing signal and the read timing data to determine whether they coincide in time;
In accordance with the determination result, a control procedure for controlling the playback tempo of the audio data without changing the pitch so as to temporally match the progress of the audio data with the generated timing signal;
The computer-readable recording medium which recorded the program for making a computer perform the reproduction | regeneration control procedure of the audio data which has.   5. The reproduction of audio data according to claim 4, wherein the control procedure for controlling the reproduction tempo controls the reproduction tempo without changing the pitch by repeatedly reading the audio data or skipping the audio data while keeping the reading speed of the audio data constant. A computer-readable recording medium recording a program for causing a computer to execute a control procedure.   5. The control procedure for controlling the playback tempo controls the playback tempo without changing the pitch by changing a reading speed of audio data and canceling a pitch change caused by the change by pitch conversion. A computer-readable recording medium having recorded thereon a program for causing a computer to execute an audio data reproduction control procedure. A storage step of storing audio data and timing data for each beat or measure corresponding to the progress of the audio data;
A timing signal generating step of recognizing a score image and generating a timing signal for each beat or measure based on the recognition result;
A reading step of reading out the audio data and timing data for each beat or measure;
A comparison step of comparing the generated timing signal and the read timing data to determine whether they coincide in time;
A control step of controlling the playback tempo of the audio data without changing the pitch so that the progress of the audio data coincides with the generated timing signal in time according to the determination result;
A method for controlling the reproduction of audio data.   8. The reproduction of audio data according to claim 7, wherein the control step of controlling the reproduction tempo controls the reproduction tempo without changing the pitch by repeatedly reading the audio data or skipping the audio data while keeping the reading speed of the audio data constant. Control method.   8. The control step of controlling the playback tempo controls the playback tempo without changing the pitch by changing a read speed of the audio data and canceling a change in pitch due to the change by pitch conversion. Audio data playback control method.

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