JP4892383B2 - Music playback apparatus, music playback method, and recording medium storing program - Google Patents

Description

  The present invention relates to a music playback device, a music playback method, and a recording medium storing a program.

  In general, a rhythmic sound such as an instrument sound is formed by an “attack sound” at the time of rising of a waveform and a “lingering sound” that continues thereafter, and these are formed singly or in combination to form a sound.

  For example, in the case of a rhythmic sound generated from a drum, the sound starts to be emitted at the moment when it is hit with a drum stick, and the subsequent sound continues to sound for a short time while being attenuated. The sound produced when the drum is excited by the drum stick is the attack sound, while the sound that continues after the resonance of the drum skin is the reverberation.

  And if you amplify only the low-range attack sound, the dynamic feeling of powerful sounds such as drums will increase, and if you amplify only the high-range attack sound, the sound of cymbals and others will become more clear and clear sound It is anticipated, and it has already been attempted to reproduce music by detecting the above attack sound and emphasizing only the attack sound particularly effectively.

  For example, in Patent Document 1, a music signal is divided into a plurality of frequency bands, an attack emphasis coefficient indicating a steep part of each band signal is calculated, the calculated attack emphasis coefficient is multiplied by the band signal, and then What synthesizes a full-band signal is described.

  However, in the method described in Patent Document 1, since a portion where the amplitude of the band signal increases abruptly is detected as an attack sound, it reacts to a sound without an attack sound (for example, a pipe organ). As a result, there was a problem that the tone of the music was lost.

In order to solve the above problem, for example, an attack sound detection device described in Patent Document 2 has been proposed. This attack sound detection device divides a music signal into a plurality of frequency bands, detects an increase in amplitude of each band signal, and has an attack sound only when the increase in amplitude of each band signal occurs at substantially the same time. It is a device that detects this and emphasizes the sound. However, the apparatus described in Patent Document 2 described above has a problem in that it is necessary to detect the amplitude amplification for all of a plurality of frequency bands, resulting in a huge amount of signal processing.
JP 2002-64895 A JP-A-9-319366

  The present invention aims to solve this problem. That is, the present invention provides, for example, a music playback device, a music playback method, and a recording medium storing a program that can effectively emphasize rhythmic sounds without losing the tone of music with a simple configuration. The purpose is that.

  According to a first aspect of the present invention, there is provided a music reproducing apparatus for emphasizing a rhythmic sound of a music signal, which is a band higher than a band in which the rhythmic fundamental tone is included from the music signal, and is a fundamental tone of a vocal or melody instrument. Is a rhythm-linked band extraction means for extracting a rhythm-linked band that is a band in which level fluctuation occurs in conjunction with the rhythmic sound without being linked, and extracts an emphasized band for emphasizing the rhythmic sound from the music signal And a signal level conversion means for converting the signal level of the enhancement band extracted by the enhancement band extraction means in accordance with the signal level of the rhythm synchronization band extracted by the rhythm synchronization band extraction means. The present invention resides in a music playback device characterized by comprising:

  According to a seventh aspect of the present invention, in the music reproduction method for emphasizing a rhythmic sound of a music signal, the band is higher than a band in which the rhythmic fundamental tone is included from the music signal, and is a fundamental tone of a vocal or melody instrument Extracting a rhythm-linked band, which is a band in which level fluctuation occurs in conjunction with the rhythmic sound without being linked, and extracting an enhancement band in which the rhythmic sound is to be emphasized from the music signal; and And a step of converting the signal level of the enhancement band in accordance with the signal level of the rhythm interlocking band extracted by the method.

  According to an eighth aspect of the present invention, in a recording medium storing a program for causing a computer to perform a process of emphasizing a rhythmic sound of a music signal, a band higher than a band in which the rhythmic fundamental tone is included from the music signal. A rhythm-linked band, which is a band in which level fluctuation occurs in conjunction with the rhythmic sound, not linked to the fundamental tone of a vocal or melody instrument, is extracted by the computer, and the rhythmic sound is extracted from the music signal. The enhancement band to be emphasized is extracted by the computer, and the signal level of the enhancement band is converted by the computer in accordance with the extracted signal level of the rhythm interlocking band. It exists in the recording medium which recorded the program to perform.

  Hereinafter, a best mode of a music reproducing apparatus according to the present invention will be described with reference to the drawings of FIGS. 1 and 2 are configuration diagrams showing an example of the basic configuration of the music playback device according to the present invention.

  As a result of repeated studies to effectively emphasize the rhythmic sound without losing the melody with a simple configuration, the present inventor has found that the vocal signal has a higher band than the band that includes the rhythmic fundamental tone. Thus, the present inventors have found that there is a rhythm-linked band in which level fluctuation occurs in conjunction with a rhythmic sound, not linked to the fundamental tone of a melody instrument, and the music reproducing apparatus according to the present invention has been completed.

  That is, as shown in FIG. 1 and FIG. 2, the music reproducing apparatus for emphasizing the rhythmic sound of the music signal has a higher band than the band in which the rhythmic fundamental tone is included from the music signal, and the vocal, melody Rhythm-linked band extraction means 1 for extracting a rhythm-linked band, which is a band in which level fluctuation occurs in conjunction with a rhythmic sound, without being linked to the fundamental tone of the instrument, and an enhancement band for emphasizing the rhythmic sound from the music signal And a signal level conversion means for converting the signal level of the enhancement band extracted by the enhancement band extraction means 2 in accordance with the signal level of the rhythm interlocking band extracted by the rhythm interlocking band extraction means 1 3.

  According to this, the signal level conversion means 3 converts the signal level of the enhancement band extracted by the enhancement band extraction means 2 in accordance with the signal level of the rhythm synchronization band extracted by the rhythm synchronization band extraction means 1. The rhythmic sound can be effectively emphasized with a simple structure without detecting the attack sound for each of a plurality of bands and without losing the tone of the music.

  In the music playback device, the rhythm interlocking band may be set in a range of 10000 Hz to 18000 Hz.

  According to this, it is possible to emphasize the sound that is linked only to the rhythm without being linked to the melody, and it is possible to enhance the rhythmic sound more effectively.

  Further, the music playback device may be set so that the enhancement band does not overlap with the rhythm interlocking band.

  According to this, since the emphasis can be made only when the signal levels of both the emphasis band and the rhythm interlocking band which are different from each other are high, the rhythmic sound can be more effectively emphasized.

  In addition, the music reproducing apparatus may include an adding unit 4 that adds the emphasized band music signal converted by the signal level converting unit 3 to the music signal.

  According to this, it is possible to superimpose the music signal in the enhanced band in which the rhythm is emphasized by the adding means 4 on the original sound (music signal).

  As shown in FIG. 1, in the music playback apparatus, the signal level conversion means 3 detects the level of the music signal in the rhythm interlocking band and outputs a signal corresponding to the level, and the enhancement band. Multiplying means 3A for multiplying the music signal in the enhanced band extracted by the extracting means 2 and the output signal of the level detecting means 6 may be included.

  According to this, when the signal level of the music signal in the enhancement band is small by simply multiplying the music signal in the enhancement band by the output signal of the level detection means 6 using the multiplication means 3A, the music in the rhythm interlocking band is obtained. Even if the signal level of the signal is large, it can be prevented from being emphasized. In addition, even if the signal level of the music signal in the enhancement band is large, if the signal level of the music signal in the rhythm interlocking band is small, it can be prevented from being emphasized. Can be emphasized.

  As shown in FIG. 2, the music reproducing apparatus includes a gain-adjustable amplifying means 3B for amplifying the music signal in the emphasized band extracted by the emphasized band extracting means 2 by the signal level converting means 3; A gain adjusting unit 3C that adjusts the gain of the amplifying unit 3B in accordance with the signal level of the music signal in the rhythm-linked band extracted by the extracting unit 1 may be included.

  According to this, the signal level of the enhancement band can be converted according to the signal level of the rhythm interlocking band using the amplification means 3B and the gain adjustment means 3C.

  The music reproduction method according to an embodiment of the present invention is a music reproduction method for emphasizing a rhythmic sound of a music signal, and is a band higher than a band including a rhythmic fundamental tone from the music signal and has a vocal. Extracting a rhythm-linked band, which is a band in which level fluctuation occurs in conjunction with a rhythmic sound without being linked to a fundamental tone of a melody instrument, and extracting an emphasized band from which a rhythmic sound is emphasized from a music signal; The step of converting the signal level of the enhancement band according to the signal level of the rhythm interlocking band extracted by the process is sequentially performed.

  According to this, by converting the signal level of the music signal in the emphasized band according to the signal level of the music signal in the rhythm-linked band, the music tone can be adjusted with a simple configuration without detecting the attack sound for each of the plurality of bands. Rhythm sound can be effectively emphasized without breaking.

  The recording medium storing the program according to the embodiment of the present invention has a higher band than the band in which the rhythmic fundamental tone is included from the music signal, and is not linked to the fundamental tone of the vocal or melody instrument. A rhythm-linked band, which is a band in which level fluctuations occur in conjunction with the sound of the system, is extracted by a computer, and an enhanced band in which a rhythm-based sound is to be emphasized from a music signal is extracted by a computer, and the extracted rhythm-linked band The signal level of the enhancement band is converted by the computer in accordance with the signal level of the band.

  According to this, by converting the signal level of the music signal in the emphasized band according to the signal level of the music signal in the rhythm-linked band, the music tone can be adjusted with a simple configuration without detecting the attack sound for each of the plurality of bands. Rhythm sound can be effectively emphasized without breaking.

  Next, an embodiment of the above-described music playback device will be described below. First, the present inventor extracts each frequency band of 20 to 200 Hz, 200 to 1000 Hz, 1000 Hz to 10000 Hz, and 10000 Hz or more from the music signal, changes in the signal level of each frequency band, the fundamental tone of vocals and melody instruments, I examined the relationship with rhythmic sounds. The results are shown in Table 1.

  As shown in Table 1, it was found that at 20 to 200 Hz, a lot of rhythmic sounds were included, and the level fluctuations were often linked to the music rhythm. From 200 Hz to 1000 Hz, it was found that the fundamental tone of the main musical instruments constituting the music is concentrated, and the level fluctuation is linked not only to the rhythm sound but also to the melody. From 1000 Hz to 10000 Hz, it was found that many overtones of the main musical instruments constituting music are included, and the level fluctuation is linked not only to the rhythm system but also to the melody. In addition, there is a rhythm-linked band that is linked only to rhythmic sounds, not linked to the fundamentals of vocals and melody instruments, at a high frequency of 10000 Hz or higher, which is higher than the band (20 Hz to 200 Hz) that includes the rhythmic fundamentals. I found out that

  Therefore, the present inventor configured the music playback device 100 as shown in FIG. 3 in order to emphasize the rhythmic sound using the music signal in the rhythm-linked band. FIG. 3 is a block diagram showing an example of the configuration of the music playback device.

  The music reproducing apparatus 100 processes a digital music signal recorded on a recording medium such as a DVD (Digital Versatile Disc), a CD (Compact Disc), or a hard disk (Hard Disk) into a signal that can be reproduced by a speaker. The music playback apparatus 100 is connected to an output unit 200 that plays back the processed music information.

  The output unit 200 reproduces and outputs the music signal output from the music playback device 100. The output unit 200 includes a digital / analog (D / A) converter 210, an amplifier 220, and a speaker 230. The D / A converter 210 is connected to the music playback device 100 and converts a digital music signal output from the music playback device 100 into analog. Then, the D / A converter 210 outputs the music signal converted into analog to the amplifier 220.

  The amplifier 220 is connected to the D / A converter 210 and to the speaker 230. The amplifier 220 amplifies the analog music signal output from the D / A converter 210 and outputs it from the speaker 230.

  The music playback apparatus 100 includes a DIR (Digital Interface Receiver) 101 to which a digital music signal read from the above-described storage medium is input, a decoder 102 that demodulates a compressed music signal, and demodulated music. For example, a DSP (Digital Signal Processor) 103 that performs various signal processing such as mixing processing and effect processing of a signal, and a CPU 104 that controls the DSP 103 are configured.

  Next, the configuration of the above-described DSP 103 will be described below with reference to FIG. The DSP 103 branches the music signal into three routes R1, R2, and R3 according to a program stored in a memory (not shown), a bandpass filter (hereinafter referred to as BPF) 1 as a rhythm-linked band extracting unit, and an enhanced band extracting unit. BPF 2-1, amplification unit 5, amplification unit 3 B- 1 as amplification unit, level detection unit 6 as level detection unit, signal level conversion unit, multiplication unit 3 A- 1 as multiplication unit, and addition An adding unit 4 and delay units 7 to 9 as means are provided.

  The BPF 1 is a filter that is provided on the route R3 and extracts the above-described rhythm interlocking band from the music signal. In the present embodiment, the BPF 1 is provided so as to extract, for example, 14000 Hz to 15000 Hz.

  The BPF 2-1 is a filter that is provided on the route R2 and extracts an enhancement band in which a rhythmic sound is to be emphasized from a music signal. In the present embodiment, the BPF 2-1 is, for example, a band (basic tone of a rhythm instrument) in which a sound / band is determined as a rhythm when a person listens to music, and a fundamental tone (200 Hz to 1000 Hz) of a vocal or melody instrument. ) Other than 100 Hz to 200 Hz.

  The amplifying unit 5 amplifies the music signal in the rhythm interlocking band extracted by the BPF 1. The amplifying unit 3B-1 amplifies the music signal in the enhanced band extracted by the BPF 2-1.

  The level detector 6 smoothes the music signal in the rhythm-linked band extracted by the BPF 1 and detects the signal level. The level detection unit 6 may be composed of, for example, a full-wave rectification unit and a low-pass filter that allows a frequency of 50 Hz or less to pass, may be configured to hold the instantaneous amplitude of a music signal in a rhythm-linked band, The effective value of the music signal in the interlocking band may be calculated. In other words, the level detection unit 6 may be configured to smooth the change in signal level according to the passage of time in the rhythm interlocking band.

  The multiplier 3A-1 multiplies the music signal in the enhanced band extracted by the BPF 2-1 by a signal obtained by smoothing the music signal in the rhythm-linked band by the level detection unit 6. The multiplication unit 3A-1 can convert the signal level of the enhancement band extracted by the BPF 2-1 in accordance with the signal level of the rhythm interlocking band extracted by the BPF 1. That is, the multiplication unit 3A-1 can perform conversion so that the signal level in the enhancement band increases as the signal level in the rhythm interlocking band increases.

  The adder 4 adds the music signal in the enhanced band converted by the multiplier 3A-1 to the music signal (original sound).

  The delay units 7 to 9 are provided on the routes R1, R2, and R3, respectively. Each of the delay units 7 to 9 adjusts the phase shift in each of the routes R1, R2, and R3 caused by the group delay of the music signal by the filter processing using the BPFs 1 and 2-1, and the processing delay of the level detection unit 6. Is provided.

  The signal processing operation in the above-described DPS 103 will be described below. First, when a music signal is input into the DPS 103, the BPF 1 in the DPS 103 extracts a rhythm-linked band music signal from the music signal, and the BPF 2-1 extracts an emphasized band music signal from the music signal. The music signal in the rhythm-linked band extracted by the BPF 1 is amplified by the amplifier 5, smoothed by the level detection unit 6, further delayed by the delay unit 9 and adjusted in phase, and then input to the multiplication unit 3 A- 1. The

  On the other hand, the music signal in the emphasized band extracted by the BPF 2-1 is amplified by the amplifier 3B-1, delayed by the delay unit 8, and adjusted in phase, and then input to the multiplication unit 3A-1. The multiplication unit 3A-1 multiplies the music signal in the enhancement band by the signal obtained by smoothing the music signal in the rhythm linkage band, and converts the music signal in the enhancement band according to the signal level of the music signal in the rhythm linkage band. Is done. The signal level of the enhancement band converted to the multiplier 3A-1 is added to the music signal (original sound) by the adder 4.

  The effects of the music playback device described above will be described below with reference to Table 2.

  When the input music signal is a rhythmic sound, as shown in pattern 1 of Table 2, both the signal level of the rhythm interlocking band and the signal level of the emphasis band are increased. Therefore, the music signal in the enhancement band can be greatly amplified and added to the original sound, and the rhythmic sound can be enhanced. Even if the input music signal is not a rhythmic sound, the signal level of the emphasis band may increase due to the influence of a melody or the like as shown in pattern 2 of Table 2. However, if the signal level of the rhythm interlocking band is small, the music signal in the emphasized band is hardly amplified even when multiplied by the multiplication unit 3A-1. For this reason, sounds that are not rhythmic sounds are not emphasized.

  Even if the input music signal is not a rhythmic sound, the signal level of the rhythm interlocking band may increase due to the influence of a melody or the like as shown in pattern 3 of Table 2. However, if the signal level in the enhancement band is small, the music signal in the enhancement band is hardly amplified even when multiplied by the multiplication unit 3A-1. For this reason, sounds that are not rhythmic sounds are not emphasized. Further, when the input music signal is not a rhythmic sound as shown in the pattern 4 of Table 3, there is almost no probability that both the signal level of the rhythm interlocking band and the emphasis band are increased. This makes it possible to accurately emphasize rhythmic sounds.

  Next, the inventors set the pass band of the BPF1 to 200 Hz to 400 Hz, 400 Hz to 600 Hz, 600 Hz to 800 Hz, 800 Hz to 1000 Hz, 1000 Hz to 2000 Hz, 2000 Hz to 3000 Hz, 3000 Hz to 4000 Hz, 4000 Hz to 5000 Hz, 5000 Hz to 6000 Hz, The music reproducing device 100 was produced as 6000 Hz to 7000 Hz, 7000 Hz to 8000 Hz, 8000 Hz to 9000 Hz, 10000 Hz to 12000 Hz, 12000 Hz to 14000 Hz, 14000 Hz to 16000 Hz, 16000 Hz to 18000 Hz, and 18000 Hz to 20000 Hz, and the music signal was reproduced. The results are shown in Table 3.

  As shown in Table 3, it was found that when the pass band of BPF 1 was set to 200 Hz to 400 Hz, the sound fluctuated other than the rhythmic sound, and this 200 Hz to 400 Hz could not be set as the rhythm interlocking band. It was also found that when the pass band of BPF 1 is set to 400 Hz to 600 Hz, a rhythm feeling is not produced, and this 400 Hz to 600 Hz cannot be set as the rhythm interlocking band. Similarly, if the pass band of BPF1 is set between 600 Hz and 2000 Hz, it is emphasized in conjunction with vocal and melody sounds in addition to rhythmic sounds, and this 600 Hz to 2000 Hz is set as the rhythm interlocking band. I found it impossible.

  Also, if the pass band of BPF1 is set between 2000 Hz and 5000 Hz, it is not as high as when it is 200 Hz to 2000 Hz, but it is emphasized somewhat in conjunction with vocal and melody sounds in addition to rhythm sounds. It was found that 2000 Hz to 5000 Hz cannot be set as the rhythm interlocking band.

  Also, if the passband of BPF1 is set between 5000 Hz and 7000 Hz, it is not as high as 2000 Hz to 5000 Hz, but it is emphasized somewhat in conjunction with vocal and melody sounds in addition to rhythmic sounds. It was found that there was little feeling and this 5000 Hz to 7000 Hz could not be set as the rhythm interlocking band.

  Also, if the pass band of BPF1 is set between 7000 Hz and 9000 Hz, it is not as high as 5000 Hz to 7000 Hz, but it is slightly emphasized in conjunction with vocal and melody sounds in addition to rhythm sounds. It was found that there was little dynamism and this 7000 Hz to 9000 Hz could not be set as the rhythm interlocking band.

  Also, if the pass band of BPF1 is set between 10000 Hz and 16000 Hz, the rhythm is emphasized in conjunction with the rhythmic sound, not linked to the vocal or melody sound, and this 10000 Hz to 16000 Hz is set as the rhythm linked band. I understood that I could do it.

  It was also found that when the pass band of BPF1 was set between 16000 Hz and 18000 Hz, the rhythm was emphasized in conjunction with the sound of the rhythm system although there was some sound fluctuation, and this 16000 Hz to 18000 Hz could also set the rhythm linkage band. . Moreover, when the pass band of BPF1 was set between 18000 Hz and 20000 Hz, it became clear that the sound fluctuated and this 18000 Hz to 20000 Hz could not be set as the rhythm interlocking band.

  From the above, it has been found that if the rhythm interlocking band is set between 10000 Hz and 18000 Hz, the rhythmic sound can be effectively enhanced without losing the tune. It was also found that if the rhythm interlocking band is set between 10000 Hz and 16000 Hz, the rhythmic sound can be effectively enhanced without further losing the tune.

  As described above, in this embodiment, since the rhythm interlocking band is set to 14000 Hz to 15000 Hz, it is possible to effectively enhance the rhythmic sound without losing the tune.

  According to the above-described embodiment, the DPS 103 is a band higher than the band in which the rhythmic fundamental tone is included, and the level from the music signal is linked to the rhythmic sound without being linked to the fundamental tone of the vocal or melody instrument. The signal level of the music signal in the rhythm-linked band extracted by BPF1, the BPF2-1 that extracts the enhancement band in which the rhythmic sound is to be emphasized from the music signal, the BPF1 that extracts the rhythm-linked band, which is a band where fluctuations occur, is obtained. Accordingly, a multiplier 3A-1 that converts the signal level of the music signal in the emphasized band extracted from the BPF 2-1 is included. As a result, the multiplier 3A-1 converts the signal level of the music signal in the enhanced band extracted by the BPF 2-1 in accordance with the signal level of the music signal in the rhythm-linked band extracted by the BPF 1. Rhythm-type sounds can be effectively emphasized with a simple configuration and without losing the tune, without detecting an attack sound for each band.

  Further, according to the above-described embodiment, since the rhythm interlocking band is set in the range of 10000 Hz to 18000 Hz, it is possible to emphasize the sound interlocking only with the rhythm without interlocking with the melody. Can effectively emphasize rhythmic sounds.

  Further, according to the above-described embodiment, since the enhancement band (100 Hz to 200 Hz) is set not to overlap the rhythm interlocking band (14000 Hz to 15000 Hz), the enhancement bands that are different from each other as shown in Table 2 Since the emphasis can be made only when the signal levels of both the rhythm interlocking bands are large, the rhythmic sound can be more effectively emphasized.

  Further, according to the above-described embodiment, since the adder 4 that adds the music signal in the enhanced band converted by the multiplier 3A-1 to the music signal is included, the enhanced band in which the rhythm is emphasized by the adder 4 Can be superimposed on the original sound (music signal).

  Further, according to the above-described embodiment, the BPF 1 uses the multiplication unit 3A-1 that multiplies the music signal in the enhanced band extracted by the BPF 2-1 by the music signal in the rhythm-linked band smoothed by the level detection unit 6. Since the signal level of the emphasized band music signal extracted by the BPF 2-1 is converted according to the signal level of the extracted music signal in the rhythm interlocking band, the music signal in the emphasized band is converted using the multiplier 3A-1. Is simply multiplied by the output signal of the level detection unit 6 and when the signal level of the music signal in the enhancement band is small as shown in Table 2, it is not enhanced even if the signal level of the music signal in the rhythm linkage band is large. Can be. In addition, even if the signal level of the music signal in the enhancement band is large, if the signal level of the music signal in the rhythm interlocking band is small, it can be prevented from being emphasized. Can be emphasized.

  In addition, according to the Example mentioned above, although the emphasis band was between 100 Hz-200 Hz, this invention is not limited to this. For example, as shown in FIG. 5, in addition to BPF2-1 that extracts 100 Hz to 200 Hz, BPF2-2 that extracts 15000 Hz or more as an enhancement band may be provided. The difference between FIG. 1 and FIG. 5 is that the music signal is further branched into the route R4, the BPF 2-2 as the enhancement band extracting means, the amplification unit 3B-2, and the delay unit 10 are provided on the route R4. A signal level conversion unit that multiplies the signal level of the interlocking band and the signal level of the enhancement band of 15000 Hz or more, and a multiplication unit 3A-2 as a multiplication unit are further provided. As shown in FIG. 5, by emphasizing 15000 Hz or more, it is possible to emphasize the higher harmonics of the rhythm sound and emphasize the sharpness of the rhythm sound.

  In addition, according to the above-described embodiment, the emphasis of music is emphasized with an emphasis band of 100 Hz to 200 Hz and 15000 or more, but is not limited to the above-described embodiment, and emphasizes a rhythmic sound. Other bands may be used as long as they are desired. Further, according to the above-described embodiment, the emphasis band is set so as not to overlap the rhythm interlocking band, but the present invention is not limited to this. The enhancement band may be set so as to overlap the rhythm interlocking band.

  Further, according to the above-described embodiment, the delay units 7 to 9 are provided in all the routes R1 to R3 that branch the music signal, but the present invention is not limited to this. For example, as shown in FIG. 5, a delay unit may not be provided in the route R2 in which the largest group delay occurs among the routes R1 to R4.

  Further, according to the above-described embodiment, the signal levels of the enhancement band extracted by the BPF 2-1 according to the signal levels of the rhythm interlocking band extracted by the BPF 1 using the multiplication units 3A-2 and 3A-3. However, the present invention is not limited to this. For example, as shown in FIG. 6, the gain adjustment as gain adjustment means that adjusts the gain of the amplifier 3A according to the signal level of the rhythm interlocking band extracted by the BPF 1 is made possible with the gain of the amplifier 3A-1. The part 3C-1 may be provided. According to this, the signal level of the enhancement band can be converted according to the signal level of the rhythm interlocking band using the amplification unit 3A-1 and the gain adjustment unit 3C-1.

  Further, according to the above-described embodiment, the rhythm interlocking band is set to 14000 Hz to 15000 Hz, but the present invention is not limited to this. As described above, the rhythm interlocking band may be any range as long as it is set within the range of 10000 Hz to 18000 Hz, preferably 10000 Hz to 16000 Hz.

  Further, according to the above-described embodiment, BPF1, BPF2-1, 2-2, amplification units 3B-1, 5, multiplication units 3A-1, 3A-2, gain adjustment unit 3C-1, addition unit 4, delay Although the parts 7 to 10 are configured by the DSP 103, the present invention is not limited to this, and the whole may be configured by an analog circuit that performs the same function, or part of the analog that functions the same. You may comprise with a circuit.

  Further, the above-described embodiments are merely representative forms of the present invention, and the present invention is not limited to the embodiments. That is, various modifications can be made without departing from the scope of the present invention.

It is a block diagram which shows an example of the basic composition of the music reproduction apparatus which concerns on this invention. It is a block diagram which shows an example of the basic composition of the music reproduction apparatus which concerns on this invention. It is a block diagram which shows one Embodiment of the music reproduction apparatus which concerns on this invention. It is a block diagram which shows the structure of DSP which comprises the music reproduction apparatus shown in FIG. It is a block diagram which shows the structure of DSP which comprises the music reproduction apparatus shown in FIG. 3 in another Example. It is a block diagram which shows the structure of DSP which comprises the music reproduction apparatus shown in FIG. 3 in another Example.

Explanation of symbols

1 BPF (rhythm-linked band extraction means)
2-1 BPF (emphasis band extraction means)
2-2 BPF (enhancement band extraction means)
3A-1 Multiplier (Signal level conversion means, multiplication means)
3A-2 Multiplication unit (signal level conversion means, multiplication means)
3B-1 Amplifying part (amplifying means)
3C-1 Gain adjuster (gain adjuster)
4 Adder (addition means)

Claims (8)

In a music playback device that emphasizes the rhythmic sound of a music signal,
Rhythm interlocking, which is a band higher than the band in which the rhythmic fundamental tone is included from the music signal, and in which a level fluctuation occurs in conjunction with the rhythmic sound, not in conjunction with the fundamental tone of a vocal or melody instrument A rhythm-linked band extracting means for extracting a band;
An enhancement band extracting means for extracting an enhancement band to emphasize the rhythmic sound from the music signal;
Signal level conversion means for converting the signal level of the enhancement band extracted by the enhancement band extraction means in accordance with the signal level of the rhythm synchronization band extracted by the rhythm synchronization band extraction means;
A music playback device comprising:   The music playback device according to claim 1, wherein the rhythm interlocking band is set in a range of 10,000 Hz to 18000 Hz.   The music playback device according to claim 1, wherein the enhancement band is set so as not to overlap the rhythm interlocking band.   The music reproducing apparatus according to any one of claims 1 to 3, further comprising addition means for adding the music signal in the emphasized band converted by the signal level conversion means to the music signal.   The signal level conversion means detects the level of the music signal in the rhythm-linked band and outputs a signal corresponding to the level; the music signal in the enhancement band extracted by the enhancement band extraction means; 5. The music reproducing device according to claim 1, further comprising a multiplying unit that multiplies the output signal of the level detecting unit.   The signal level converting means amplifies the music signal in the emphasized band extracted by the emphasized band extracting means, the gain adjustable amplification means, and the signal level of the rhythm interlocked band extracted by the rhythm interlocked band extracting means. 5. The music reproducing apparatus according to claim 1, further comprising: a gain adjusting unit that adjusts the gain of the amplifying unit in response. In a music playback method that emphasizes the rhythmic sound of a music signal,
Rhythm interlocking, which is a band higher than the band in which the rhythmic fundamental tone is included from the music signal, and in which a level fluctuation occurs in conjunction with the rhythmic sound, not in conjunction with the fundamental tone of a vocal or melody instrument Extracting a band to extract and an enhancement band to emphasize the rhythmic sound from the music signal;
Converting the signal level of the enhancement band according to the signal level of the rhythm interlocking band extracted by the step;
The music playback method characterized by performing sequentially. In a recording medium storing a program for causing a computer to perform processing for emphasizing a rhythmic sound of a music signal,
Rhythm interlocking, which is a band higher than the band in which the rhythmic fundamental tone is included from the music signal, and in which a level fluctuation occurs in conjunction with the rhythmic sound, not in conjunction with the fundamental tone of a vocal or melody instrument A band is extracted by the computer;
An emphasis band for emphasizing the rhythmic sound from the music signal is extracted by the computer, and
A recording medium on which a program is recorded, wherein the signal level of the enhancement band is converted by the computer in accordance with the extracted signal level of the rhythm interlocking band.

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