JP2010160453A - Musical tone reproduction device and control circuit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a musical tone reproduction device for continuously reproducing a musical tone while suppressing a sense of incongruity arising from tempo misalignment. <P>SOLUTION: The musical tone reproduction device includes: a tempo analysis section for analyzing tempo information in a first musical tone and a second musical tone, wherein a tempo is different from each other; a determination section for determining a first number which is the number of tempo peak intervals of the first musical tone included in a first cycle which is constituted by one or more tempo peak intervals, and a second number which is the number of tempo peak intervals of the second musical tone in a second cycle which is constituted by one or more tempo peak intervals, based on the analyzed tempo information; a tempo change section for changing each tempo speed of the first musical tone and the second musical tone so that the first cycle constituted by the determined first number may match the second cycle constituted by the determined second number; a musical tone synthesis section for synthesizing the first musical tone and the second musical tone, in which the tempo speeds are changed; and a musical tone output section for outputting the synthesized first musical tone and second musical tone. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a musical sound reproducing device and a control circuit. In particular, the present invention relates to a musical sound reproducing apparatus and a control circuit that perform continuous reproduction without interruption while matching the tempo of the musical sound.

  2. Description of the Related Art In recent years, in a musical sound reproducing apparatus, a method of continuously reproducing musical sounds in a random or predetermined order (hereinafter referred to as continuous reproduction) so that viewers are not bored due to sound interruption when musical sounds are switched. Is used. However, if the musical sound is played continuously without interruption, the tempo, which is one of the characteristics of the musical sound, may suddenly change. In this case, that is, when the difference in tempo between the front and rear musical sounds is large, the viewer feels uncomfortable.

  In order to suppress the uncomfortable feeling, for example, there is a continuous playback method for automatically performing what is performed by DJ (Disc Jockey) until now, that is, automatically playing back the music at the same tempo at the connection part of the music to be played back continuously. It has been proposed (see, for example, Patent Document 1). Here, the tempo is the length of a beat, that is, the speed of a beat, which is a unit constituting the rhythm of music. The beat has a fixed time interval, and its tempo is determined by its length. Hereinafter, the beat position is described as the tempo peak position.

The continuous reproduction method of Patent Document 1 connects musical tones that are continuously reproduced while matching the position of the tempo peak in the previous musical tone and the position of the tempo peak in the subsequent musical tone.
Japanese Patent No. 3799360

  However, in the conventional method, when the tempo difference between the musical sounds is large, when the tempo peaks are played back together, the reproduced musical sound becomes a musical sound greatly deviated from the original tempo. For this reason, the viewer hears the reproduced musical sound different from the original musical sound, and conversely increases the sense of discomfort.

  In order to avoid this problem, in the conventional method, as shown in FIG. 10, when the difference in tempo is large (No in S902), continuous playback is performed without matching the tempo. Here, FIG. 10 is a flowchart showing the process of continuous reproduction in the conventional musical sound reproducing apparatus. In order to avoid this problem, a method of eliminating a sense of incongruity by selecting a musical sound having a similar tempo and continuously playing it can be considered. However, in this case, since the range for selecting the music to be continuously played, that is, the selectable music is limited, it cannot be continuously played in the order of the desired music.

  Therefore, the conventional method cannot eliminate the uncomfortable feeling caused by the tempo shift.

  Accordingly, the present invention has been made to solve the above-described problems, and an object thereof is to provide a musical sound reproducing apparatus and a control circuit for continuously reproducing musical sounds while suppressing a sense of incongruity caused by a tempo shift.

  In order to solve the above-described problems, a musical tone reproducing apparatus according to the present invention is a musical tone reproducing apparatus that continuously reproduces first and second musical tones having different tempos, wherein the first musical tone and the second musical tone are reproduced. A tempo analysis unit that analyzes tempo information including a tempo speed indicating the speed of a beat that is a unit constituting a rhythm in the first tune, and the first musical sound included in a first period constituted by one or more tempo peak intervals Tempo information obtained by analyzing the first number that is the tempo peak interval number of the second musical tone and the second number that is the tempo peak interval number of the second musical sound included in the second period composed of one or more tempo peak intervals A determination unit that is determined based on the first number of tempo peak intervals, and a first period of the first musical sound that is determined by the determined first number of tempo peak intervals and the second number of tempo peak intervals that are determined Second A tempo changing unit for changing the tempo speeds of the first musical sound and the second musical sound so that the second period of the sound matches, and the first tempo speed changed by the tempo changing part. A musical tone synthesis unit that synthesizes the second musical tone and the musical tone output unit that outputs the synthesized first musical tone and the second musical tone.

  With this configuration, it is possible to suppress a sense of incongruity caused by a tempo shift when synthesizing musical sounds having different tempos. In other words, how to match the tempo of the first musical sound and the second musical sound is determined from the analyzed tempo information, and the tempo speeds of the first musical sound and the second musical sound are both set so as to suppress the tempo change ratio during reproduction. change. Thereby, the uncomfortable feeling caused by the tempo shift can be suppressed. Here, the tempo change ratio indicates the ratio between the original musical tempo and the musical tempo after the tempo change.

  In addition, the tempo analysis unit determines that the first number or the second number of the first musical sound or the second musical sound that is determined to be the faster tempo speed from the analyzed information is an integer of 2 or more. You may decide.

  With this configuration, even when synthesizing musical sounds having greatly different tempos, the number of tempo peaks included in the period of the first or second musical sound having a high tempo speed is adjusted, and the first period is set so that the periods coincide with each other. By changing the tempo speed of the second musical sound and the second musical sound, it is possible to suppress a sense of incongruity caused by a tempo shift.

  In addition, the tempo analysis unit determines that the first number or the second number of the first musical sound or the second musical sound, which is determined from the analyzed information to be the slower tempo speed, is 1. Also good.

  With this configuration, the number of tempo peaks included in the cycle of the first or second musical sound having the fast tempo speed is adjusted based on the number of tempo peaks included in the cycle of the first or second musical sound having the slow tempo speed. The tempo speeds of the first musical sound and the second musical sound are changed so that the respective periods coincide with each other. As a result, a sense of incongruity caused by a tempo shift can be suppressed.

  Further, the tempo analysis unit has a table in which a predetermined combination of the first number and the second number is held, and the first number and the table are determined from the analyzed information and the combination of the tables. The second number may be determined.

  With this configuration, the first number and the second number can be easily determined. That is, there are an infinite number of combinations of the first number and the second number, but the number of combinations that actually suppress the uncomfortable feeling caused by the difference in tempo is small. Therefore, by determining the combination of the first number and the second number in advance, the first number and the second number can be easily determined.

  The tempo analysis unit calculates a change ratio that is a ratio between the tempo speed of the first musical sound and the tempo speed of the second musical sound from the analyzed information, and the first number is calculated from the calculated change ratio. And the second number may be determined.

  With this configuration, it is possible to determine the first number and the second number while suppressing a sense of incongruity caused by a significant change from the original musical tone tempo.

  In addition, the tempo analysis unit further includes a ratio of the volume at the tempo peak position of the first musical sound and the average volume, which is a ratio between the first musical tempo intensity and the volume of the second musical sound at the tempo peak position. A tempo strength determination unit that calculates a certain second musical tone tempo strength and determines whether the calculated first musical tone tempo strength and the second musical tone tempo strength are less than or equal to a threshold value is provided, and the first musical tone tempo is determined by the tempo strength determination unit. When it is determined that the intensity or the second musical tone tempo intensity is less than or equal to the threshold, the tempo changing unit determines not to change the tempo speed between the first musical tone and the second musical tone, and the tempo changing unit The tempo speed of the first musical sound and the second musical sound may be left unchanged without changing the tempo speed of the part.

  With this configuration, it is possible to obtain an effect of suppressing a sense of incongruity caused by a change from the original musical tone tempo.

  The tempo changing unit includes a first tempo changing unit that changes a tempo speed of the first musical sound and a second tempo changing unit that changes a tempo speed of the second musical sound, and the first tempo changing unit. The unit, from a tempo speed of the first musical sound, to a tempo speed of the second musical sound (the first number / the first frequency) while matching the first period and the second period in a predetermined period. The tempo speed of the first musical sound is changed by gradually changing the tempo speed to 2 times), and the second tempo changing unit is configured to change the first period and the second period in the predetermined period. , By gradually changing the tempo speed from (second number / first number) times the tempo speed of the first musical sound to the tempo speed of the second musical sound. Change the tempo speed of musical tone 2 It may be. That is, the tempo changing unit continuously reproduces the tempo peak of the first musical tone and the second musical tone while gradually changing the tempo.

  With this configuration, when the musical sounds are connected, it is possible to reproduce at the tempo of the original musical sound while suppressing a rapid change in the tempo.

  The musical tone synthesizing unit may synthesize the first musical tone and the second musical tone, whose tempo speed is changed by the tempo changing unit, in a cut-in manner.

  The musical tone synthesizing unit may synthesize the first musical tone and the second musical tone whose tempo speed has been changed by the tempo changing unit in a cross-fade manner.

  The musical tone synthesizing unit may synthesize the first musical tone and the second musical tone, whose tempo speed is changed by the tempo changing unit, by a mixing method.

  In order to achieve the above object, the control circuit of the present invention is a control circuit for a musical sound reproducing apparatus for continuously reproducing first and second musical tones having different tempos, wherein the first musical sound and the first musical sound are A tempo analysis unit that analyzes tempo information including a tempo speed indicating the speed of a beat, which is a unit constituting a rhythm in the second musical sound, and the first period that is included in one or more tempo peak intervals Tempo information obtained by analyzing the first number of tempo peak intervals of the first musical sound and the second number of tempo peak intervals of the second musical tone included in the second period composed of one or more tempo peak intervals. A determination unit that is determined based on the first number of tempo peak intervals, and a first period of the first musical sound that is determined by the determined first number of tempo peak intervals and the second number of tempo peak intervals that are determined Second A tempo changing unit for changing the tempo speeds of the first musical sound and the second musical sound so that the second period of the sound matches, and the first tempo speed changed by the tempo changing part. A musical tone synthesis unit that synthesizes the second musical tone and the musical tone output unit that outputs the synthesized first musical tone and the second musical tone.

  According to the present invention, it is possible to realize a musical sound reproducing apparatus and a control circuit that continuously reproduce musical sounds while suppressing a sense of incongruity caused by a tempo shift.

  The best mode for carrying out the present invention will be described below with reference to the drawings.

(Embodiment 1)
FIG. 1 is a block diagram showing the configuration of a musical tone reproducing apparatus according to the present invention.

  The musical sound reproducing device 100 includes a musical sound input unit 10, a tempo analysis unit 30, a tempo change unit 40, a musical sound synthesis unit 50, and a musical sound output unit 60. The musical sound input unit 10 includes a first musical sound input unit 11 and a second musical sound input unit 12 to which digital data of musical sounds are input, and a first tempo information input unit 21 to which digital data indicating the tempo information is input. And a second tempo information input unit 22. The tempo changing unit 40 includes a first tempo changing unit 41 and a second tempo changing unit 42. Hereinafter, each block will be described.

  The musical sound input unit 10 receives, for example, two musical sounds composed of PCM (Pulse Coded Module) data and their tempo information from the outside. Then, the musical sound input unit 10 outputs the two input musical sounds to the tempo changing unit 40, and outputs the tempo information of the two input musical sounds to the tempo analysis unit 30.

  Specifically, the first musical sound input unit 11 receives, for example, digital data of the previous musical sound (hereinafter referred to as the first musical sound) among the musical sounds scheduled to be continuously reproduced. The first musical sound input unit 11 outputs the input first musical sound to the first tempo changing unit 41 of the tempo changing unit 40. The second musical sound input unit 12 receives, for example, digital data (hereinafter referred to as a second musical sound) of subsequent musical sounds among the musical sounds scheduled to be continuously reproduced. The second musical sound input unit 12 outputs the input second musical sound to the second tempo changing unit 42 of the tempo changing unit 40.

  The first tempo information input unit 21 receives digital data indicating the tempo information of the first musical tone input to the first musical tone input unit 11 (hereinafter referred to as tempo information of the first musical tone). The first tempo information input unit 21 outputs the tempo information of the input first musical sound to the tempo analysis unit 30. The second tempo information input unit 22 receives digital data indicating the tempo information of the second musical sound input to the second musical sound input unit 12 (hereinafter referred to as tempo information of the second musical sound). The second tempo information input unit 22 outputs the tempo information of the input second musical sound to the tempo analysis unit 30. Here, the first tempo information input unit 21 and the second tempo information input unit 22 receive digital data representing tempo information from the outside. The tempo information is information relating to the tempo including at least the tempo speed.

  The first tempo information input unit 21 and the second tempo information input unit 22 perform signal processing on the musical tone data input to the first musical tone input unit 11 and the second musical tone input unit 12 instead of being input from the outside. Each tempo information may be generated and output to the tempo analysis unit 30.

  The tempo analysis unit 30 analyzes the tempo information of the first tone and the second tone input from the first tempo information input unit 21 and the second tempo information input unit 22, respectively, and tempo peaks of the first tone and the second tone. Determine how to match. Specifically, based on the analyzed tempo information, the tempo analysis unit 30 determines the number of tempo peak intervals of the first musical tone included in the period constituted by one or more tempo peak intervals of the first musical tone, and the second The number of tempo peak intervals of the second musical tone included in a cycle composed of one or more tempo peak intervals of the musical tone is determined. Here, the tempo analysis unit 30 includes an analysis unit for analyzing the tempo information of the first musical tone and the second musical tone input from the first tempo information input unit 21 and the second tempo information input unit 22, respectively, A determination unit that determines how to match the tempo peak of the second musical sound may be provided.

  In addition, the tempo analysis unit 30 instructs the tempo change unit 40 on how to match the determined tempo peak.

  For example, the tempo analysis unit 30 analyzes the tempo information of the first musical tone and the second musical tone, respectively, and determines which musical tone has the slower tempo. Then, the tempo analysis unit 30 configures a period that approximates the basic period, with a period formed by a fixed number of tempo peak intervals of a slow-tempo musical tone as a basic period so that the change rate of the tempo is minimized. Determine the number of tempo peak intervals for fast-paced music. In this way, the tempo analysis unit 30 determines how to match the tempo peaks of the first musical sound and the second musical sound.

  Upon receiving an instruction from the tempo analysis unit 30, the tempo change unit 40 tempos of the two musical sounds input from the musical sound input unit 10 so as to match the initial and final tempo peaks in the period of the first musical tone and the second musical tone. To change. Then, the tempo changing unit 40 outputs the two musical sounds whose tempos have been changed to the musical sound synthesizing unit 50.

  For example, in response to an instruction from the tempo analysis unit 30, the first tempo change unit 41 changes the tempo of the first musical sound input from the first musical sound input unit 11. That is, the first tempo changing unit 41 adjusts the first tempo peak at the beginning and end of the first musical tone constituting the cycle and the tempo peak at the beginning and end of the second musical tone constituting the basic cycle. Change the tempo of the tone. Then, the first tempo changing unit 41 outputs the first musical sound with the changed tempo to the musical sound synthesizing unit 50. The second tempo changing unit 42 receives an instruction from the tempo analyzing unit 30 and changes the tempo of the second musical tone input from the second musical tone input unit 12. That is, the second tempo changing unit 42 adjusts the tempo peak between the beginning and end of the second musical sound constituting the basic period and the tempo peak at the beginning and end of the first musical sound constituting the period. Change the tempo of the tone. Then, the second tempo changing unit 42 outputs the second musical sound with the changed tempo to the musical sound synthesizing unit 50. In this way, the first tempo changing unit 41 and the second tempo changing unit 42 match the periods of the first musical tone and the second musical tone by matching the tempo peaks at the beginning and the end of the first musical tone, and then the musical tone synthesis unit 50. Output to.

  The musical tone synthesizing unit 50 is output from the tempo changing unit 40, that is, the first tempo changing unit 41 and the second tempo changing unit 42, mixes the first musical sound and the second musical tone whose tempo has been changed, and outputs the musical sound output unit 60. Output via.

As described above, the musical sound reproducing device 100 is configured.
Next, the movement of the music sound reproducing device 100 will be described. Here, an example of processing of the tempo analysis unit 30 and the tempo change unit 40, which is a characteristic part of the present invention, will be described.

First, an example of processing in which the tempo analysis unit 30 determines how to match tempo peaks will be described.
FIG. 2 is a flowchart for explaining processing in which the tempo analysis unit according to the first embodiment determines how to match tempo peaks. Here, T1 and T2 indicate the tempo of the first musical tone and the tempo of the second musical tone, respectively. N1 and N2 respectively represent the number of tempo peak intervals of the first musical tone and the number of tempo peak intervals of the second musical tone that constitute the period described above, and are integers. The number of tempo peak intervals has the same meaning because it can be treated as equivalent to the number of tempo peaks that continue in time if a certain tempo peak is used as a reference.

  First, the tempo analysis unit 30 analyzes the tempo information of the first musical tone and the second musical tone inputted from the first tempo information input unit 21 and the second tempo information input unit 22, and determines the tempo (T1) of the first musical tone. The tempo (T2) of the second musical tone is acquired (S101).

  Next, the tempo analysis unit 30 checks which musical tone has the slower tempo. That is, it is determined whether the tempo (T2) of the second musical tone is slower than the tempo (T1) of the first musical tone (T1> T2) (S103).

  The tempo analysis unit 30 determines that the tempo (T2) of the second musical tone is not slower than the tempo (T1) of the first musical tone, that is, the tempo (T1) of the first musical tone is slower (No in S103). ), The tempo peak interval number (N1) of the first musical tone constituting the cycle is 1, and the tempo peak interval number (N2) constituting the cycle of the second musical tone having a fast tempo is set to N2 = [T2 / T1 + 0.5]. (S105). Here, [N] indicates a maximum integer not exceeding N, for example, [3.5] = 3.

  On the other hand, when the tempo (T2) of the second musical tone is slower than the tempo (T1) of the first musical tone (Yes in S103), the tempo analysis unit 30 determines the tempo peak interval of the second musical tone constituting the cycle. The number (N2) is set to 1, and the number of tempo peak intervals (N1) constituting the cycle of the first musical tone having a fast tempo is determined from N1 = [T1 / T2 + 0.5] (S107).

  As described above, the tempo analysis unit 30 uses the period composed of the number of tempo peak intervals of a slow-tempo musical tone at a certain time as the basic period, and the tempo of the fast-sounding musical sound that constitutes a period approximating the basic period. By determining the number of peak intervals, how to match the tempo peaks of the first musical tone and the second musical tone is determined.

  Next, an example of processing in which the tempo changing unit 40, that is, the first tempo changing unit 41 and the second tempo changing unit 42 change the tempo to match the tempo peak will be described.

  FIG. 3 is a diagram conceptually showing a process of changing the tempo in order to adjust the tempo peak by the tempo changing unit in the first embodiment. FIG. 3A shows a tempo peak (original tempo peak) of a musical sound input from the musical sound input unit 10 on a time axis, and shows a state in which the tempo of the first musical sound and the second musical sound are shifted. Yes. FIG. 3B shows the changed tempo peak of the musical sound input from the musical sound input unit 10 (tempo peak after the change) on the time axis.

  In FIG. 3A, the first tempo changing unit 41 and the second tempo changing unit 42 in the tempo changing unit 40 are the number of tempo peaks between two first musical sounds and the tempo peak of one second musical sound. The tempo analysis unit 30 receives an instruction so that the number of intervals constitutes a period. Then, the first tempo change unit 41 and the second tempo change unit 42 respectively perform the first musical tone and the second musical tone so that the first and second tempo peaks of the first musical tone and the second musical tone coincide with each other. Change the tempo. Here, the tempo of the first musical tone and the second musical tone is changed so that one tempo peak interval of the second musical tone is matched with two tempo peak intervals of the first musical tone.

  In the example shown in FIG. 3A, the tempo of the first musical tone is 150 BPM (Beats Per Minute) earlier than the second musical tone, and the tempo of the second musical tone is 90 BPM later than the first musical tone. In the example shown in FIG. 3B, the first and second tempo peaks of the first musical tone and the second musical tone in the respective periods coincide with each other (the first musical tone for one tempo peak interval of the second musical tone). 2), the tempo of the second musical tone is changed to 82 BPM, and the tempo of the first musical tone is changed to 164 BPM.

  In the first embodiment, the tempo of the first musical tone and the second musical tone after the change is set to (first musical tone change ratio-1) and (1-second) so that the tempo change ratio is minimized. The change rate of the musical tone of the sound is required to be the same. Specifically, the first tempo changing unit 41 obtains the tempo after the change of the first musical tone by (2 × T1 × T2 × N1) / (T1 × N2 + T2 × N1). The second tempo changing unit 42 obtains the changed tempo of the second musical sound by (2 × T1 × T2 × N2) / (T1 × N2 + T2 × N1). Here, T1 and T2 indicate the tempo of the first musical tone and the tempo of the second musical tone, respectively. N1 and N2 respectively indicate the number of tempo peak intervals of the first musical tone and the number of tempo peak intervals of the second musical tone that constitute the period described above, and are integers designated by the tempo analysis unit 30.

  Note that (2 × T1 × T2 × N1) / (T1 × N2 + T2 × N1), which is the tempo of the first musical tone after the change, is N1 which is the number of tempo peak intervals constituting the cycle of the first musical tone. Divided by ((1 / T2 × N2) + (1 / T1 × N)) / 2. Similarly, (2 × T1 × T2 × N2) / (T1 × N2 + T2 × N1), which is the tempo of the second musical tone after the change, changes N2, which is the number of tempo peak intervals constituting the cycle of the second musical tone. Divided by ((1 / T2 × N2) + (1 / T1 × N)) / 2, which is the tempo of the later cycle.

  As described above, the tempo changing unit 40 receives the instruction from the tempo analyzing unit 30 and performs the first musical sound and the second musical sound so that the tempo peaks of the first musical sound and the second musical sound are matched in the basic cycle. Change the tempo.

  As described above, according to the first embodiment, the first musical tone and the second musical tone can be synthesized and continuously reproduced while being combined with the tempo while preventing a significant deviation from the original tempo. As a result, the tempo matching method is analyzed from the tempo information of the musical sound, the tempo matching method of the first musical sound and the second musical sound is determined from the analyzed tempo information, and the tempo change ratio during playback is suppressed. Both tempo speeds of the first musical sound and the second musical sound are changed. Thereby, it is possible to realize a musical sound reproducing apparatus that continuously reproduces musical sounds while suppressing a sense of incongruity caused by a tempo shift.

(Embodiment 2)
In the first embodiment, an example in which the tempo analysis unit 30 determines how to match the tempo peaks of the first musical sound and the second musical sound based on which tempo is slower between the first musical sound and the second musical sound. Explained. In the second embodiment, a case will be described in which the tempo analysis unit 30 determines a case where there is a large difference in tempo between the first musical tone and the second musical tone. The configuration of the music sound reproducing device 100 is the same as that in FIG.

  FIG. 4 is a flowchart for explaining processing in which the tempo analysis unit in the second embodiment determines how to match tempo peaks. Here, T1 and T2 indicate the tempo of the first musical tone and the tempo of the second musical tone, respectively. N1 and N2 respectively represent the number of tempo peak intervals of the first musical tone and the number of tempo peak intervals of the second musical tone that constitute the period described above, and are integers.

  First, the tempo analysis unit 30 analyzes the tempo information of the first musical tone and the second musical tone input from the first tempo information input unit 21 and the second tempo information input unit 22 (S201), and the tempo of the first musical tone ( T1) is compared with the tempo (T2) of the second musical tone. Here, the tempo analysis unit 30 will be described below on the assumption that the tempo (T1) of the first musical tone is faster than the tempo (T2) of the second musical tone (T1> T2).

  Next, the tempo analysis unit 30 determines whether or not there is a large difference in the tempo between the first musical tone and the second musical tone. That is, it is determined whether the tempo (T1) of the first musical tone is 1.5 times slower than the tempo (T2) of the second musical tone (T1 <1.5 × T2) (S203). In step (Yes), it is further determined whether the tempo (T2) of the second musical tone is slower than 1.5 times the tempo (T1) of the first musical tone (1.5 × T1> T2) (S205).

  When the tempo (T2) of the second musical tone is slower than 1.5 times the tempo (T1) of the first musical tone (Yes in S205), the tempo analysis unit 30 performs the tempo between the first musical tone and the second musical tone. Is determined that there is no significant difference, and the tempo changing unit 40 is instructed to turn off the tempo changing function indicating that the musical sounds are synthesized without changing the tempo.

  In S203 or S205, if T1 <1.5 × T2 or 1.5 × T1> T2 (No in S203 or No in S205), the tempo between the first musical tone and the second musical tone is large. If there is a difference, the number of tempo peak intervals included in a predetermined time of the second musical sound having a slow tempo is used as a basic period, and the number of tempo peak intervals of the first musical tone having a fast tempo that constitutes a period approximating it is determined ( S209 or S211). Note that S209 and S211 are the same as S107 in FIG.

  As described above, the tempo analysis unit 30 determines how to match the tempo peaks of the first musical sound and the second musical sound in consideration of the case where the tempos of the first musical sound and the second musical sound are greatly shifted.

  As a result, it is possible to match the tempos of musical tones that are greatly deviated from the tempo while preventing them from deviating greatly from the original tempo.

  In FIG. 4, the tempo analysis unit 30 is described as having obtained a comparison result that the tempo (T1) of the first musical tone is faster than the tempo (T2) of the second musical tone (T1> T2). The same applies when the comparison result is obtained that the tempo (T2) of the second musical tone is faster than the tempo (T1) of the first musical tone (T2> T1). In that case, S209 and S211 are the same as S105 of FIG. That is, the number of tempo peak intervals included in a predetermined time of the first musical sound having a slow tempo is set as a basic period so that the change rate of the tempo is minimized, The number of tempo peak intervals may be determined.

(Embodiment 3)
In the third embodiment, another mode for determining how to match the tempo peaks of the first musical tone and the second musical tone will be described. The configuration of the music sound reproducing device 100 is the same as that in FIG.

  FIG. 5 is a flowchart for explaining processing in which the tempo analysis unit according to the third embodiment determines how to match tempo peaks. FIG. 6 is a table showing the optimum number of tempo peak intervals for the first musical sound and the second musical sound in the tempo ratio between the first musical sound and the second musical sound. Here, T1 and T2 indicate the tempo of the first musical tone and the tempo of the second musical tone, respectively. N1 and N2 respectively represent the number of tempo peak intervals of the first musical tone and the number of tempo peak intervals of the second musical tone that constitute the period described above, and are integers.

  In FIG. 5, first, the tempo analysis unit 30 analyzes the tempo information of the first musical tone and the second musical tone input from the first tempo information input unit 21 and the second tempo information input unit 22 and acquires the first tempo information. A tempo ratio (T1 / T2) between the tempo (T1) of the musical tone and the tempo (T2) of the second musical tone is calculated (S301).

  Next, the tempo analysis unit 30 refers to the table shown in FIG. 6 and determines N1 and N2 from the calculated tempo ratio (T1 / T2).

  Here, FIG. 6 considers both the uncomfortable feeling due to the tempo change and the uncomfortable feeling due to the tempo matching, and the optimal tempo peak matching method from the ratio of the tempo of the first musical sound and the tempo of the second musical sound. Is created in advance.

  As described above, the tempo analysis unit 30 determines how to match the tempo peaks of the first musical sound and the second musical sound.

  As described above, the tempo analysis unit 30 determines the combination of the number of tempo peak intervals in the table created in advance from the tempo ratio of the first musical tone and the second musical tone, and thereby the tempo of the first musical tone and the second musical tone. Decide how to match the peaks.

  Thereby, it is possible to adjust the tempo while suppressing both the uncomfortable feeling due to the tempo shift and the uncomfortable feeling due to the tempo matching.

(Embodiment 4)
In the fourth embodiment, an additional function of the tempo analysis unit 30 that determines how to match the tempo peaks of the first musical tone and the second musical tone will be described.

  FIG. 7 is a block diagram showing the configuration of the musical sound reproducing apparatus in the fourth embodiment. Elements similar to those in FIG. 1 are denoted by the same reference numerals, and detailed description thereof is omitted. The tone reproduction device 200 shown in FIG. 7 differs from the tempo analysis unit 30 of the tone reproduction device 100 according to the first embodiment in the configuration of the tempo analysis function unit 35.

  The tempo analysis function unit 35 includes a tempo analysis unit 31, a first musical sound volume acquisition unit 32, and a second musical sound volume acquisition unit 33. The tempo analysis unit 30 in the first embodiment has an additional function. It has become.

  The first musical sound volume acquisition unit 32 acquires the volume of the first musical sound input from the first musical sound input unit 11 and outputs it to the tempo analysis unit 31.

  In addition, the second musical sound volume acquisition unit 33 acquires the volume of the second musical sound input from the second musical sound input unit 12 and outputs it to the tempo analysis unit 31.

  The tempo analysis unit 31 uses the first musical tone volume input from the first musical tone volume acquisition unit 32 to determine the first musical tone tempo intensity ratio (TI1) which is the ratio of the volume of the first musical tone at the tempo peak position to the average volume. Is calculated. Similarly, the tempo analysis unit 31 uses the second musical tone volume input from the second musical tone volume acquisition unit 33 to determine the second musical tone tempo intensity ratio, which is the ratio between the volume at the tempo peak position of the second musical tone and the average volume. (TI2) is calculated.

  The tempo analysis unit 31 analyzes the tempo information of the first musical tone and the second musical tone inputted from the first tempo information input unit 21 and the second tempo information input unit 22, respectively, and the tempo peaks of the first musical tone and the second musical tone. Determine how to match.

  Here, when the calculated first musical tone tempo intensity ratio (TI1) or second musical tone tempo intensity ratio (TI1) is lower than the threshold, the tempo analysis unit 31 has a tempo peak that is small enough to ignore the original musical tone. Judge that there is no need to match. That is, it determines how to match the tempo peaks of the first tone and the second tone that synthesize the tone without changing the tempo. The tempo analysis unit 31 then instructs the tempo change unit 40 how to match the determined tempo peak.

As described above, the musical sound reproducing device 200 is configured.
FIG. 8 is a flowchart for explaining processing of the additional function of the tempo analysis unit for determining how to match tempo peaks in the fourth embodiment. Here, TI1 and TI2 indicate the tempo intensity ratio of the first musical sound and the tempo intensity ratio of the second musical sound, respectively. The tempo intensity ratio is the ratio of the volume at the tempo peak position to the average volume. Show.

  First, the tempo analysis unit 31 calculates the first musical tone tempo intensity ratio (TI1) based on the volume of the first musical sound input from the first musical sound volume acquisition unit 32, and is input from the second musical sound volume acquisition unit 33. A second musical tone tempo intensity ratio (TI2) is calculated from the volume of the second musical tone (S401).

  Next, the tempo analysis unit 31 determines whether the calculated first musical tone tempo intensity ratio (TI1) or the second musical tone tempo intensity ratio (TI1) is lower than a threshold (S403).

  When TI1 or TI2 is lower than the threshold value (Yes in S403), the tempo analysis unit 31 determines that the original musical sound is so small that it can be ignored and it is not necessary to match the tempo peak. Then, the tempo analysis unit 31 instructs the tempo change unit 40 to turn off the tempo change function indicating that the musical sound is synthesized without changing the tempo.

In S403, when TI1 and TI2 are higher than the threshold values (Yes in S403), the tempo analysis unit 31 proceeds to S405 and determines how to match the tempo peaks.
For S405, S103 to S107 of FIG. 2 may be applied, or S201 to S211 of FIG. 4 may be applied.

  As described above, the tempo analysis unit 31 determines how to match the tempo peaks of the first tone and the second tone in consideration of the tempo intensity ratio.

  In this way, it is possible to eliminate the uncomfortable feeling caused by changing the tempo by not performing the tempo change in the case of a musical sound that does not originally have a discomfort caused by a tempo shift.

(Embodiment 5)
In the first to fourth embodiments, the tempo changing unit 40 of the musical sound reproducing device 100 receives an instruction from the tempo analyzing unit 30 and inputs the musical sound so that the tempo peaks at the beginning and the end of the two musical sounds in the respective periods are matched. The example in the case of changing the tempo of two musical sounds input from the unit 10 has been described. In the fifth embodiment, an example of a method of gradually changing the tempo while matching the tempo peaks at the beginning and the end of each cycle will be described as one aspect of the method of changing the tempo between the first musical tone and the second musical tone. . The configuration of the music sound reproducing device 100 is the same as that in FIG.

FIG. 9 is a diagram illustrating an example of a mode in which the first musical sound and the second musical sound are continuously reproduced.
FIG. 9A is a diagram illustrating an example in which the tempo changing unit changes the tempo between the first musical tone and the second musical tone.

  Here, it is assumed that the tempo of the first musical sound input to the tempo changing unit 40 is 60 BPM and the tempo of the second musical sound is 160 BPM.

  In FIG. 9 (a), the tempo changing unit 40 causes the tempo analysis unit 30 to set the tempo peak so that the tempo peak interval of one first musical tone and the tempo peak interval of two second musical tones constitute a cycle. In this example, the tempo between the first musical tone and the second musical tone is changed in response to an instruction on how to match the first musical tone.

  In other words, there is a first musical sound reproduction period in which the first musical sound was reproduced in the first half of the time axis, and the tempo peaks at the respective periodic positions (periodic time points) of the first musical sound and the second musical sound are gradually adjusted. After the musical tone synthesis period in which the tempo is changed, there is a second musical tone reproduction period in which the second musical tone is reproduced in the latter half of the time axis.

  Specifically, first, in the first musical sound reproduction period in the first half of the time axis, the first musical sound is reproduced at 60 BPM, which is the original tempo.

  Next, playback of the second musical sound is started. The time for synthesizing the musical sounds (musical sound synthesis period) is determined, and the initial and final tempo peaks in the period of the first musical sound and the second musical sound are matched within that time. While gradually changing the tempo. That is, the tempo changing unit 40 continuously adjusts the tempo from 60 BPM to 80 BPM for the first musical tone and from 120 BPM to 160 BPM for the second musical tone, while keeping the tempo peak alignment received from the instruction from the tempo analyzing unit 30. change. In the musical tone synthesizing unit 50, the tempo changing unit 40 synthesizes the first musical tone and the second musical tone whose tempos are continuously changed, and outputs the synthesized musical tone to the musical tone output unit 60 to reproduce the synthesized musical tone.

  Next, in the second musical sound reproduction period in the latter half of the time axis, the second musical sound is reproduced at the original tempo of 160 BPM.

  By doing so, it is possible to perform continuous reproduction while suppressing both the uncomfortable feeling resulting from the tempo shift and the uncomfortable feeling resulting from the rapid change in the tempo.

  FIG. 9B and FIG. 9C show an example in which the musical tone synthesizing unit 50 synthesizes the input first musical tone and the second musical tone while gradually changing the volume. FIG. 9B shows an example in which the musical tone synthesis unit 50 has a crossfade function and crossfades the first musical tone and the second musical tone. FIG. 9C shows an example in which the musical tone synthesis unit 50 has a cut-in function and cuts in the first musical tone and the second musical tone. Even in this way, both of the uncomfortable feeling caused by the tempo shift and the uncomfortable feeling caused by the rapid change of the tempo can be suppressed during the continuous reproduction.

  As described above, according to the fifth embodiment, continuous reproduction is performed while gradually changing the tempo while matching the tempo peaks at the beginning and the end of each period of the first musical tone and the second musical tone. As a result, when the musical sounds are connected to each other, it is possible to reproduce at the tempo of the original musical sound while suppressing a rapid change of the tempo.

  Note that the musical tone synthesis unit 50 may have a function other than the crossfade or cut-in function, and may have a mixing function for changing the ratio of the musical tone between the first musical tone and the second musical tone.

  In that case, the present invention can be applied not only to the continuous reproduction of two musical sounds but also to the use of a game for generating new musical sounds and a karaoke apparatus having a medley reproduction function by mixing a plurality of musical sounds.

  As described above, according to the present invention, it is possible to realize a musical sound reproducing apparatus that continuously reproduces musical sounds while suppressing a sense of incongruity caused by a tempo shift.

  As mentioned above, although the musical sound reproducing apparatus of this invention was demonstrated based on embodiment, this invention is not limited to this embodiment. For example, it may be a control device provided with components of a musical sound reproducing device. That is, unless the spirit of the present invention departs from the scope of the present invention, various modifications conceived by those skilled in the art have been made in this embodiment, and forms constructed by combining components in different embodiments are also within the scope of the present invention. included.

  INDUSTRIAL APPLICABILITY The present invention can be used for a musical sound reproducing apparatus and its control circuit, and is particularly useful as a musical sound reproducing apparatus that continuously reproduces musical sounds while suppressing a sense of incongruity caused by a difference in tempo.

It is a block diagram which shows the structure of the musical tone reproduction apparatus in this invention. 10 is a flowchart for explaining a process in which the tempo analysis unit according to the first embodiment determines how to match tempo peaks. It is the figure which showed notionally the process which changes the tempo in order that the tempo change part in Embodiment 1 may match a tempo peak. FIG. 10 is a flowchart for explaining a process in which a tempo analysis unit in the second embodiment determines how to match tempo peaks. FIG. 10 is a flowchart for explaining a process in which a tempo analysis unit in Embodiment 3 determines how to match tempo peaks. It is a table which shows the optimal number of tempo peak intervals of the 1st musical tone and the 2nd musical tone in the ratio of the tempo of the 1st musical tone and the 2nd musical tone. FIG. 10 is a block diagram showing a configuration of a music sound reproducing device in a fourth embodiment. 15 is a flowchart for explaining processing of an additional function of a tempo analysis unit that determines how to match tempo peaks in the fourth embodiment. It is a figure which shows the example of the aspect in case a 1st musical tone and a 2nd musical tone are reproduced | regenerated continuously. It is a flowchart which shows the process which carries out the continuous reproduction in the conventional musical sound reproduction apparatus.

DESCRIPTION OF SYMBOLS 10 Musical sound input part 11 1st music sound input part 12 2nd music sound input part 21 1st tempo information input part 22 2nd tempo information input part 30, 31 Tempo analysis part 32 1st music sound volume acquisition part 33 2nd music sound volume acquisition part 35 Tempo analysis function unit 40 Tempo change unit 41 First tempo change unit 42 Second tempo change unit 50 Music sound synthesis unit 60 Music sound output unit 100, 200 Music reproduction device

Claims (20)

A musical sound reproducing apparatus for continuously reproducing first and second musical sounds having different tempos,
A tempo analysis unit that respectively analyzes tempo information including tempo speed indicating the speed of a beat that is a unit constituting a rhythm in the first musical sound and the second musical sound;
The first number that is the number of tempo peak intervals of the first musical sound that is included in the first period that is composed of one or more tempo peak intervals, and the second period that is composed of one or more tempo peak intervals. A determination unit that determines a second number that is a tempo peak interval number of the second musical sound based on the analyzed tempo information;
A first period of the first musical sound composed of the determined first number of tempo peak intervals and a second period of the second musical sound composed of the determined second number of tempo peak intervals; Tempo changing units for changing the tempo speeds of the first musical sound and the second musical sound, respectively, so that
A tone synthesis unit that synthesizes the first tone and the second tone whose tempo speed has been changed by the tempo change unit;
A musical sound reproducing apparatus comprising: a musical sound output unit that outputs the synthesized first musical sound and the second musical sound. The tempo analysis unit
2. The first number or the second number of the first musical sound or the second musical sound determined to be a faster tempo speed from the analyzed information is determined to be an integer of 2 or more. Music sound playback device. The tempo analysis unit
3. The first number or the second number of the first musical sound or the second musical sound that is determined to be the slower tempo speed from the analyzed information is determined to be 1. 3. Musical sound playback device. The tempo analysis unit
A table that holds a predetermined combination of the first number and the second number;
The music reproduction device according to any one of claims 1 to 3, wherein the first number and the second number are determined from the analyzed information and the combination of the tables. The tempo analysis unit
A change ratio that is a ratio between the tempo speed of the first musical sound and the tempo speed of the second musical sound is calculated from the analyzed information, and the first number and the second number are determined from the calculated change ratio. The music sound reproducing device according to any one of claims 1 to 4. The tempo analysis unit further includes:
The first musical tone tempo intensity, which is the ratio of the volume at the tempo peak position of the first musical sound and the average volume, and the second musical tone tempo intensity, which is the ratio of the volume at the tempo peak position of the second musical sound and the average volume, are calculated. A tempo strength determination unit for determining whether the calculated first musical tone tempo strength and second musical tone tempo strength are equal to or less than a threshold value,
When the first musical tone tempo strength or the second musical tone tempo strength is determined to be equal to or lower than the threshold by the tempo strength determining unit, it is determined that the tempo speeds of the first musical tone and the second musical tone are not changed. ,
6. The tempo changing unit leaves the tempo speeds of the first musical sound and the second musical sound unchanged without changing the tempo speed of the tempo analysis part according to the determination that the tempo speed is not changed. 2. A musical sound reproducing apparatus according to item 1. The tempo changing unit includes a first tempo changing unit that changes a tempo speed of the first musical sound and a second tempo changing unit that changes a tempo speed of the second musical sound,
The first tempo changing unit
The tempo speed of the second musical sound is changed from the tempo speed of the first musical sound to the tempo speed of the second musical sound (the first number / the second number) while the first period and the second period are matched in a predetermined period. Changing the tempo speed of the first musical sound by gradually changing the tempo speed to double,
The second tempo changing unit
In the predetermined period, while the first period and the second period coincide with each other, the tempo speed of the first musical sound is multiplied by (the second number / the first number) times of the second musical sound. The musical sound reproducing device according to any one of claims 1 to 6, wherein the tempo speed of the second musical sound is changed by gradually changing the tempo speed to the tempo speed. The musical tone according to any one of claims 1 to 7, wherein the musical tone synthesis unit synthesizes the first musical tone and the second musical tone whose tempo speed has been changed by the tempo changing unit in a cut-in manner. Playback device. The musical tone according to any one of claims 1 to 7, wherein the musical tone synthesizing unit synthesizes the first musical tone and the second musical tone, the tempo speed of which has been changed by the tempo changing unit, in a crossfade manner. Playback device. The musical tone reproduction according to any one of claims 1 to 7, wherein the musical tone synthesizing unit synthesizes the first musical tone and the second musical tone whose tempo speed has been changed by the tempo changing unit by a mixing method. apparatus. A control circuit for a musical sound reproducing apparatus for continuously reproducing first and second musical sounds having different tempos,
A tempo analysis unit that respectively analyzes tempo information including tempo speed indicating the speed of a beat that is a unit constituting a rhythm in the first musical sound and the second musical sound;
The first number of tempo peak intervals of the first musical sound included in a first cycle composed of one or more tempo peak intervals and the second included in a second cycle composed of one or more tempo peak intervals. A determination unit that determines a second number of tempo peak intervals of the musical sound based on the analyzed tempo information;
A first period of the first musical sound composed of the determined first number of tempo peak intervals and a second period of the second musical sound composed of the determined second number of tempo peak intervals; Tempo changing units for changing the tempo speeds of the first musical sound and the second musical sound, respectively, so that
A tone synthesis unit that synthesizes the first tone and the second tone whose tempo speed has been changed by the tempo change unit;
A control circuit comprising: a tone output unit for outputting the synthesized first tone and the second tone. The tempo analysis unit
The first number or the second number of the first musical sound or the second musical sound that is determined to be a faster tempo speed from the analyzed information is determined to be an integer of 2 or more. Control circuit. The tempo analysis unit
13. The first number or the second number of the first musical sound or the second musical sound that is determined to be a slower tempo speed from the analyzed information is determined as 1. Control circuit. The tempo analysis unit
A table that holds a predetermined combination of the first number and the second number;
The control circuit according to any one of claims 11 to 13, wherein the first number and the second number are determined from the analyzed information and the combination of the tables. The tempo analysis unit
A change ratio that is a ratio between the tempo speed of the first musical sound and the tempo speed of the second musical sound is calculated from the analyzed information, and the first number and the second number are determined from the calculated change ratio. The control circuit according to any one of claims 11 to 14. The tempo analysis unit further includes:
The first musical tone tempo intensity, which is the ratio of the volume at the tempo peak position of the first musical sound to the average volume, and the second musical tone tempo intensity, which is the ratio of the volume at the tempo peak position of the second musical sound and the average volume, are calculated. A tempo strength determination unit for determining whether the calculated first musical tone tempo strength and second musical tone tempo strength are equal to or less than a threshold value,
When the first tone tempo strength or the second tone tempo strength is determined to be equal to or less than the threshold by the tempo strength determining unit, it is determined that the tempo speeds of the first tone and the second tone are not changed. ,
The tempo changing unit leaves the tempo speed of the first musical sound and the second musical sound unchanged without changing the tempo speed of the tempo analysis part according to the decision to not change the tempo speed. 2. The control circuit according to item 1. The tempo changing unit includes a first tempo changing unit that changes a tempo speed of the first musical sound and a second tempo changing unit that changes a tempo speed of the second musical sound,
The first tempo changing unit
The tempo speed of the second musical sound is changed from the tempo speed of the first musical sound to the tempo speed of the second musical sound (the first number / the second number) while the first period and the second period are matched in a predetermined period. Changing the tempo speed of the first musical sound by gradually changing the tempo speed to double,
The second tempo changing unit
In the predetermined period, while the first period and the second period coincide with each other, the tempo speed of the first musical sound is multiplied by (the second number / the first number) times of the second musical sound. The control circuit according to any one of claims 11 to 16, wherein the tempo speed of the second musical sound is changed by gradually changing the tempo speed to a tempo speed. The control according to any one of claims 11 to 17, wherein the musical tone synthesis unit synthesizes the first musical tone and the second musical tone whose tempo speed has been changed by the tempo changing unit in a cut-in manner. circuit. The control according to any one of claims 11 to 17, wherein the tone synthesis unit synthesizes the first tone and the second tone with the tempo speed changed by the tempo change unit in a crossfade manner. circuit. The control circuit according to any one of claims 11 to 17, wherein the musical tone synthesizing unit synthesizes the first musical tone whose tempo speed is changed by the tempo changing unit and the second musical tone by a mixing method. .

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