JP2005196074A - Musical performance system, and musical sound and video reproducing apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To automatically avoid overlap between a musical sound confused with audio on a transmission side and a musical sound reproduced with MIDI data by a musical performance system that transmits MIDI data, video, and audio through a network etc., for a remote lesson and reproduces a musical sound of an automatic playing piano on a reception side with the MIDI data. <P>SOLUTION: The MIDI data received on the reception side are input to a sound source of a piano controller 22a to generate a musical sound signal corresponding to the MIDI data. A switch module 21f judges whether the sound volume level of the musical sound signal is equal to or higher than a prescribed level. When so, audio output is turned off and no audio is reproduced by a loudspeaker 25, and when not, the audio output is turned on. A time difference is given before the audio output is turned on after the sound volume level decreases to or below the prescribed level. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a performance system that transmits performance data and, for example, an audio video signal from a transmission side to a reception side, and reproduces musical sounds based on the performance data and video and audio based on the audio video signal on the reception side.

  Conventionally, this type of performance system has been developed for performing lessons and remote concerts using an automatic performance piano, for example. FIG. 7 is a schematic diagram of a conventional performance system. A controller 51 on the transmission side (teacher side), a controller 61 on the reception side (student side), a videophone 52 on the transmission side, and a videophone 62 on the reception side are connected to the Internet 10. Are connected to each other. Performance data (MIDI data) generated by the performance of the automatic performance piano 53 on the transmission side is input to the controller 51, and the controller 51 refers to the internal clock 51a and adds the time when the MIDI data is generated as a time stamp to the MIDI data. Then, these data are transmitted from the packet send module 51b as packet data. The audio video signal reproduced by the videophone 52 is transmitted to the videophone 62 on the receiving side (for example, by a streaming system or a video conference system).

  The controller 61 on the receiving side receives the packet data transmitted via the Internet 10 by the packet receive module 61b, extracts the MIDI data, and stores it in the MIDI out buffer 61c. The MIDI data is output to the electronic musical instrument 63 by adjusting the timing of MIDI output based on the internal clock 61a and the time stamp, and the automatic performance piano 63 generates a musical sound based on the MIDI data. The video fan 62 on the receiving side reproduces video based on the received audio video signal and reproduces audio based on the audio signal.

  In this way, when an automatic performance piano is played back based on performance data, the live performance sound (acoustic sound) is generated from the automatic performance piano, and the key corresponding to the musical sound automatically moves, making it a piano lesson. Is preferred.

A group performance learning apparatus in which a master device as an electronic musical instrument on the teacher side and a child device as an electronic musical instrument on the student side are connected to perform a lesson of musical instruments for a plurality of students is disclosed in, for example, Japanese Patent Laid-Open No. 7-199790. It is disclosed in the gazette. In this conventional technique, the teacher and the group to be monitored can be arbitrarily selected and set in order for the teacher to monitor the performance by the student.
Japanese Patent Laid-Open No. 7-199790

  However, in the conventional performance system, when the audio playback by the audio signal is normally played on the receiving side, the musical sound played on the transmitting side is also the teacher's advice among the sounds collected on the transmitting side. Therefore, the live music sound generated from the automatic performance piano based on the performance data received from the transmission side overlaps the music sound in the sound of the audio signal. For this reason, conventionally, it has been necessary to mute the sound using a mixer or the like. For example, in the case of a lesson, the student must mute off and mute on when listening to the teacher's voice played with an audio signal and when listening to the teacher's performance (student's automatic performance). There is a problem that it takes time and effort. Especially for children, this kind of operation is extremely difficult, and there is a problem that the lesson progress is also hindered.

  In addition to the technique as described in JP-A-7-199790, the teacher's video and audio can be sent to the student side, and the student can be instructed by video and audio. It is difficult to control.

  The present invention relates to music and audio based on performance data in a performance system in which performance data and, for example, an audio video signal are transmitted from the transmission side to the reception side, and a musical sound based on the performance data and audio based on the audio signal are reproduced on the reception side. It is an object of the present invention to perform automatic control so as not to overlap with musical tones in speech based on signals.

  The performance system according to claim 1 of the present invention transmits performance data (for example, MIDI data) and an audio signal generated on the transmission side, receives the performance data and the audio signal on the reception side, and receives the performance data. Musical sound reproduction by data and audio reproduction by the audio signal are performed. At this time, on the receiving side, based on the received performance data, the sound reproduction by the received audio signal is stopped when the musical sound based on the performance data is reproduced, and the sound reproduction based on the audio signal is performed when the musical sound based on the performance data is not reproduced. I do. Therefore, when the musical sound based on the performance data is being reproduced, the musical sound based on the audio signal is not reproduced.

  The performance system according to claim 2 of the present invention includes a sound source that generates a musical sound signal corresponding to the performance data on the receiving side, and is received when the volume level of the musical sound signal corresponding to the received performance data is equal to or higher than a predetermined level. The sound reproduction by the audio signal is stopped, and the sound reproduction by the received audio signal is performed when the volume level is lower than the predetermined level. Therefore, it is possible to deal with characteristics of actual musical sounds that are not reflected in the performance data, such as piano decaying musical sounds.

  According to the performance system of claims 1 and 2 of the present invention, it is possible to automatically control so that the musical sound based on the performance data and the musical sound based on the audio signal do not overlap.

  Further, according to the performance system of the second aspect, it is possible to cope with the characteristics of the actual musical tone that is not reflected in the performance data, such as the musical tone attenuated by the piano, with a simple process.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a functional block diagram for explaining main functions of the performance system according to the embodiment of the present invention. This performance system performs remote lessons. The transmitting side is the teacher side and the receiving side is the student side. The transmitting-side controller 11 and the receiving-side controller 21 transmit and receive signals via the Internet 10, and the performance-side operation of the transmitting-side automatic performance piano 12 that is the teacher side causes the student-side receiving-side automatic performance piano. At 22 the piano tone is generated and the model is played on the student side. In addition, the video and audio of the instruction and performance by the teacher taken by the video camera 14 on the transmission side are transmitted from the videophone 13, the video is reproduced on the videophone 23 and the display 24 on the reception side, and the audio is reproduced on the speaker 25. To do.

  First, a synchronization function between MIDI data and an audio video signal by transmission / reception operations on the transmission side and the reception side will be described. The transmission-side controller 11 and the reception-side controller 21 are configured by a computer or the like, and the transmission-side internal clock 11 a, time stamp addition module 11 b, packet send module 11 c, and click generation module 11 d are functions of the controller 11. The internal clock 21a, click generation time buffer 21b, packet receive module 21c, MIDI out buffer 21d, click timing detection module 21e, and switching module (SW) 21f on the receiving side are functions of the controller 21.

  The transmission-side piano controller 12a is an apparatus for electronically controlling the automatic performance piano 12, and the reception-side piano controller 22a is an apparatus for electronically controlling the automatic performance piano 22. The performance of the transmission-side automatic performance piano 12 is detected by a key sensor or the like. MIDI data corresponding to the performance is output from the piano controller 12a. The reception-side piano controller 22a drives (plays back) the automatic performance piano 22 based on the received MIDI data. It is a well-known technique that the automatic performance pianos 12 and 22 control a key driving solenoid based on MIDI data and generate a piano sound by striking a string. Here, in this embodiment, the piano controller 22a on the receiving side is provided with a waveform memory sound source, and a digital musical tone signal of a piano tone is generated based on input MIDI data (such as a program change of piano tone). Generate. This digital musical tone signal is used to detect the volume level in the switching module 21f of the controller 21.

  The controller 11 on the transmission side activates the click generation module 11d at the start of transmission, and the click generation module 11d generates a click signal at regular intervals. This click signal is input to the videophone 13 and is internally processed by the controller 11. The When MIDI data is generated from the piano controller 12a, the controller 11 adds a time stamp indicating the generation time of the MIDI data obtained by referring to the internal clock 11a to the MIDI data, and the packet send module 11c. Is transmitted as packet data. When the click signal is detected, click time data indicating the click occurrence time of the click signal is generated, and the click time data is transmitted as packet data from the packet send module 11c. Further, every time a click signal is generated from the click generation module 11c, the videophone 13 includes the click signal in the audio signal and transmits it. In the packet data, data for identifying the MIDI / click time is recorded in a header or the like, and the receiving side identifies the MIDI data and the click time data based on the header information.

  Further, every time a click signal is generated from the click generation module 11d, the videophone 13 includes the click signal in the audio signal and transmits it. The video camera 14 images the teacher's keyboard performance on the automatic performance piano 12 and outputs the video signal to the videophone 13. The videophone 13 compresses and transmits the video signal and the audio signal. Here, the audio signal in this embodiment is a monaural case, and the click signal included in the audio signal is a click signal having a frequency (for example, 40 Hz) that does not frequently appear as an audio signal, for example. Then, the click signal is detected through the filter on the receiving side.

  The receiving-side controller 21 receives the packet data with the packet receive module 21c, and stores the MIDI data in the MIDI out buffer 21d when the packet data is MIDI data. If the packet data is the click time data, The click time data is stored in the click occurrence time buffer 21b. When a click signal is detected by the click timing detection module 21e from the audio signal received by the videophone 23, the internal clock 21a is corrected based on the click time data corresponding to the click signal.

  The MIDI data from the controller 11 and the click time data (click generation time of the click signal) are transmitted to the controller 21 as packet data in the packet communication system using the Internet 10. The video phone 13 compresses and outputs a video signal and a monaural audio signal, and the video signal and the audio signal are transmitted to the video phone 23 by a video conference system using the Internet 10. The audio signal is transmitted including the click signal from the click generation module 11d.

  FIG. 2 is a diagram conceptually showing the relationship between packet data and a click signal (audio signal) with respect to time progression in the embodiment. The click signal is output as a pulse signal at a predetermined interval. The packet data mainly transmits MIDI data (“MIDI” in the figure), but also click time data (“click” in the figure) is transmitted when a click signal is generated on the transmission side. The click signal and the click time data are associated with each other so as to be paired with each other by transmitting the click time data detection timing and the click signal detection timing at substantially the same time on the receiving side. . Since the corresponding click signal and click time data are not necessarily received simultaneously, those detected within a predetermined time interval correspond to each other.

  FIG. 3 is a diagram illustrating an example in which a pair is detected by absorbing a difference in reception timing between the click signal and the click time data. When the click signal arrives first as shown in FIG. 3A, a click detection signal is obtained at the rise of the click signal. Therefore, a timer for measuring a predetermined time is started by this click detection signal, and the time ΔT until the click time data is detected is counted. When the click time data is detected, the internal clock 21a is corrected with the time obtained by adding the timer value ΔT to the click time t indicated by the click time data as the current time on the receiving side. As a result, the internal clock 21a has the same result as that when the click signal is detected and corrected based on the click time data corresponding to the click signal. The predetermined time for the timer to finish timing is set according to the interval (interval) between the click signals that are intermittently transmitted (and received), and the click time is within a predetermined time after the click signal is detected. If no data is detected, the correction operation by the detected current click signal is stopped.

  As shown in FIG. 3B, when the click time data comes first, the click time t indicated by the click time data is stored in the click occurrence time buffer 21b, and the click signal is transmitted within a predetermined time. When (click detection signal) is detected, the internal clock 21a is corrected using the click time t stored in the click occurrence time buffer 21b as the current time when the click signal on the receiving side is detected. Also in this case, when the click signal is not detected within a predetermined time after the click time data is detected, the correction operation using the detected current click time data is stopped.

  Next, the predetermined time corresponding to the difference between the systems of the second transmission system for transmitting the click signal (audio video signal) (video conference system and streaming system) will be described. The delay of the first transmission system that transmits MIDI data and click time data varies depending on the network state, but is usually about 10 to 100 milliseconds (milliseconds).

(Video conferencing system) In the video conferencing system, the delay time on the video side is about 200 to 300 milliseconds, and when the click time data comes before the detection signal depending on the network state (FIG. 3 (B)), the click time data is The timing correction operation is performed assuming that the signal comes after the detection signal (FIG. 3A). When the click time data comes before the detection signal, it is only necessary to cover a delay time of about 300 msec, which is the difference between the minimum delay time of 10 msec of the first transmission system and the maximum delay time of the second transmission system. Yes, the predetermined time may be 300 + α m seconds (α: several tens to 200 m seconds). When the click time data comes after the detection signal, it is a case where a delay exceeding the range of the delay time assumed on the above-mentioned MIDI signal side occurs, so if it is possible to cover even a delay of about 300 milliseconds, The predetermined time may be about 100 milliseconds or less, which is the difference in the minimum delay time of the second transmission system. It is assumed that the network state of the first transmission system is bad and it takes a long time to send a MIDI packet. In such a case, the receiving side stops communication in parallel with the timing correction. You may make it urge the transmission side.

(Streaming system) The streaming system has a delay on the video side of about 15 to 30 seconds, which is an order of magnitude larger than the delay time of the first transmission system. For this reason, the timing correction operation is performed when the click time data comes first. There is no doubt that the click time data comes after the detection signal, but in this case, the MIDI signal itself is processed as an error and is not used for the synchronization process. The predetermined time when the click time data comes first only needs to be able to correct the difference between the minimum delay time of the first transmission system and the maximum delay time of the second transmission system. Therefore, the predetermined time may be 30 seconds + β (β: several seconds). The predetermined time when the click time data comes later may be set to zero. Note that both α and β are values that may cause the video system delay to change rapidly.

  Based on these, an example of the interval between the predetermined time and the click signal is given. The second transmission system for transmitting the click signal (audio video signal) is a video conference system in this embodiment, and in this case, the transmission is performed. From about 200 to 300 milliseconds and the interval between the click signals is set to about 2 seconds. The predetermined time assumed in response to the click time data coming first is “predetermined time B”, and the predetermined time assumed in response to the click time data coming later is “predetermined time A”. In this case, the predetermined time B regulated by the timer may be about 0.5 seconds, for example. Further, the predetermined time A may be about 0.1 seconds. When a streaming system is used as the second transmission system, the transmission system has a delay of about 5 to 20 seconds, and the interval between the click signals should be set to about 30 seconds with a margin. . In this case, the predetermined time B regulated by the timer may be about 25 seconds, and the predetermined time A may be 0 seconds.

  FIG. 4 is a flowchart showing a main part of the transmission process of the controller 11 on the transmission side. First, in step S11, the generation of MIDI data from the piano controller 12a is monitored, and in step S12, the generation of a click signal from the click generation module 11d is monitored. When the MIDI data is generated, a time stamp is added to the MIDI data in step S13, and it is transmitted as packet data in step S14. If a click signal is generated, the click time is acquired from the internal clock 11a in step S16, a time stamp is added to the click time data, and the packet data is transmitted. If there is an instruction to end the process, the process ends. Note that the click signal (audio signal) from the click generation module 11d is transmitted by the videophone 13 independently of the processing of the controller 11.

  FIG. 5 is a flowchart showing the main part of the receiving process of the controller 21 on the receiving side. In this process, the A flag and the B flag are set in order to use the processes of FIGS. 3 (A) and 3 (B) together. Used. Further, a predetermined time A timer for measuring the predetermined time A and a predetermined time B timer for measuring the predetermined time B are used. Note that the reception process in the packet receive module 21c is separately performed by an interrupt process, and performs a process according to whether MIDI data or click time data is received. First, in step S21, an A flag, a B flag, and an OFF flag, which will be described later, are reset to “0” and the audio output is turned on. Next, in step S22, it is determined whether there is MIDI data. If there is no received MIDI data, the process proceeds to step S30. If there is received MIDI data, MIDI data processing such as adjustment of the sound generation time (event timing) is performed in step S23, and the process proceeds to step S30. In step S30, the audio switching process of FIG. 6 described later is performed, and the process proceeds to step S24. In step S24, it is determined whether there is click time data. If there is no click time data, it is determined in step S25 whether a click signal has been detected. If not detected, step S22 and subsequent steps are repeated.

  If there is no click time data in step S24 and a click signal is detected in step S25, then it is the case of FIG. 3A (click signal is first), and it is determined in step S26 whether the B flag = “1”. To do. Since the B flag is set to “1” when the click time data is earlier, in this case, the process proceeds to step S27, and the predetermined time A timer is started. In step S28, the A flag is set to "1". Then, in step S29, it is determined whether or not the A timer has finished counting for a predetermined time. If the timing has been finished, the process returns to step S21 to reset the A flag and the B flag. If the predetermined time A timer has not ended, the process proceeds to step S201, and if there is no instruction to end the process, the process returns to step S22. If there is an instruction to end the process, the audio signal output is forcibly turned on in step S202 to end the process.

  That is, in this state, the detection of the click time data is monitored while measuring the predetermined time A by the predetermined time A timer. If the click time data is detected within the predetermined time A, it is determined in step S202 whether the A flag is “1”. Since the A flag is set to “1” when the click signal is earlier, in this case, the process proceeds to step S203, the timer value ΔT is added to the click time t to obtain the current time, and the internal clock 21a is corrected. To do. At 204, the A flag and the A timer for a predetermined time are reset, and the process proceeds to step S29.

  On the other hand, if the click time data is detected in step S24 before the click signal is detected, it is the case of FIG. 3B. In this case, the process proceeds from step S202 to step S205, and the predetermined time B Start the timer. Next, the click time data is stored in the click occurrence time buffer 21b in step S206, and the B flag is set to "1" in step S207. Then, in step S29, it is determined whether or not the B timer has finished counting for a predetermined time. If the timing has ended, the process returns to step S21 to reset the A flag and the B flag. If the predetermined time B timer has not timed, the process proceeds to step S201, and if there is no instruction to end the process, the process returns to step S22.

  In this state, the detection of the click signal is monitored while measuring the predetermined time B by the predetermined time B timer. If a click signal is detected within the predetermined time B, the process proceeds from step S25 to step S26, and further proceeds from step S26 to step S208. In step S208, the internal clock 21a is corrected using the click time t stored in the click occurrence time buffer 21b as the current time (click signal detection timing). In step S209, the B flag and the B timer for a predetermined time are reset.

  Thus, when the click signal arrives, the corresponding click time data is set as the current time, or when the click time data arrives first, the time when the corresponding click signal arrives is obtained from the click time data. The internal clock 21a is corrected. Also, since the audio video signal including the click signal is naturally synchronized with the click signal (simultaneity is guaranteed), when the automatic performance with MIDI data is performed using the internal clock 21a as a time base, This automatic performance and the reproduced video are synchronized. That is, synchronization can be automatically established.

  Even if the click signal or the click time data cannot be received for some reason (when missed), the clock can be corrected by the next pair or the next pair. Even in such a case, there is no problem because once the correction is made, it takes a certain amount of time until the synchronization is lost (or the time shift becomes noticeable).

  FIG. 6 is a flowchart of the audio switching process (step S30 in FIG. 5). In this process, a musical tone signal is generated by the piano controller 22a based on the received MIDI data, and audio output is performed according to the volume level of the musical tone signal. Processing to switch on / off. Note that the musical tone is not reproduced by the musical tone signal. In this process, an OFF flag indicating the audio output off state is used, and this OFF flag is set to “1” when the audio output is off and reset to “0” when the audio output is on. Also, a predetermined time C timer is used to provide a predetermined time (for example, several seconds) until the volume level becomes equal to or lower than the predetermined level and switches from the audio output off state to the audio output on state.

  First, in step S31, it is determined whether the volume level (envelope) of the musical tone signal from the piano controller 22a is equal to or higher than a predetermined level. This predetermined level is a level that is hardly heard when a musical sound is actually generated. If the volume level is equal to or higher than the predetermined level, the audio output is turned off in step S32, the OFF flag is set to “1”, and the process returns to the original routine. If the volume level is not equal to or higher than the predetermined level, it is determined in step S33 whether the OFF flag = “1”. If the OFF flag = “1”, the C timer is started in step S34 and the OFF flag is set to “0”. To "" and return to the original routine. If the OFF flag = “0” in step S33, it is determined in step S35 whether or not the C timer has finished timing. If not, the process returns to the original routine, and the C timer finishes timing. If so, the audio output is turned on in step S36 to return to the original routine.

  For example, when the volume level exceeds a predetermined level due to the first key-on rise (attack) or the like, the audio output is turned off (OFF flag = “1”) in the flow of steps S31 → S32. Next, when the sound volume level falls below a predetermined level due to sound attenuation or the like, first, since the OFF flag = “1”, the C timer is started by the flow of steps S31 → S33 → S34 and the OFF flag = “0”. Is done. Therefore, the flow of steps S31 → S33 (here, OFF flag = “0”) → S35 is repeated until a predetermined time elapses in this state. When the predetermined time has elapsed, the audio output is turned on in the flow of steps S31 → S33 → S35 → S36. Even when the volume level becomes equal to or higher than the predetermined level before the predetermined time elapses, the audio output is turned off (OFF flag = “1”) by the flow of steps S31 → S32.

  Through the above processing, the teacher side (transmission side) can give instruction to the student side (reception side) using the video image (video signal) and audio (audio signal), and the teacher side starts playing. Then, on the student side, the performance is started on the automatic performance piano 22 based on the MIDI data sent, but at this time, the sound is automatically cut (audio output off), and the live music sound by the automatic performance piano 22 is played. You can listen to model performances by (and key movements). When the performance is finished, the voice is automatically recovered (audio output is turned on). Therefore, there is no overlap between the musical sound by the automatic performance piano and the musical sound by the voice (audio signal).

  In this embodiment, a tone signal that is not used for sound generation by the sound source is generated based on the MIDI data, and the audio output is switched on / off according to the volume level of the tone signal. Performing such a process has the following advantages. Since the piano is a decaying sound, even after the MIDI data is turned on, even if the note is not turned off for a while, the sound of the piano's musical tone itself may not be heard. In this case, the audio output is turned on with a simple process. It can be. For example, if an audio output on / off process is performed using only MIDI data directly, it is necessary to perform a time lag process between actual sound attenuation and note off. Therefore, such a complicated process becomes unnecessary.

  However, even if the audio output is switched on / off depending on whether MIDI data is turned on or off, etc., the same effect can be obtained if it is sufficient with a certain degree of accuracy.

  In the above embodiments, the case where the audio signal is monaural has been described. However, when a left and right (LR) stereo signal can be transmitted as an audio signal as in a streaming system, a click signal is included in one channel and the other signal is included. The audio signal may be transmitted as it is on the channel.

  In the above embodiment, the case where a remote lesson is performed using the Internet has been described. However, as described in Japanese Patent Application Laid-Open No. 7-199790, the master device is an electronic musical instrument on the teacher side and the electronic musical instrument on the student side. It can also be applied to cases where lessons are held by connecting the slave unit with a cable. In this case, only the microphone audio signal is transmitted and received between the teacher and the student using the microphone of the headphone with the microphone. However, the MIDI data is exchanged by connecting an automatic performance piano or the like, and the MIDI data is transmitted in the same manner as in the embodiment. You can also play an automatic piano. Also in this case, according to the present invention, it is possible to automatically avoid duplication of musical sounds based on MIDI data and musical sounds based on voice.

  In the above embodiment, an example of performing a piano lesson has been described, but the present invention can also be applied to a remote concert. Further, MIDI data or audio / video signals transmitted from the transmission side may be transmitted in advance recorded in a storage device or a recording medium.

  Furthermore, the present invention can also be applied to a case where MIDI data of performance performed by the teacher and voices such as guidance from the teacher are recorded on some media, and this media is reproduced to give a lesson. In this case, if the musical sounds of the teacher's performance are recorded at the same time as the audio signal, the range of application in the lesson will be expanded.

  Also, when recording on media as described above, the audio signal is automatically turned off by the teacher's controller or the like based on the MIDI data, as in the embodiment, so that the musical sound by this audio signal is not automatically recorded. You can also.

  In the embodiment, the output by the MIDI data and the output by the audio signal are automatically switched on the reception side. However, the transmission side performs the determination as shown in FIG. The output may be automatically switched.

  In the embodiment, an example of an automatic performance piano has been described. However, other forms of musical instruments that generate musical sounds based on MIDI data (for example, electronic keyboard instruments, automatic performance wind instruments, string instruments, electronic wind instruments, and electronic string instruments). It goes without saying that the above can also be applied.

It is a functional block diagram explaining the principal part function of the performance system in embodiment of this invention. It is a figure which shows notionally the relationship between the packet data and click signal in embodiment. It is a figure which shows the example which absorbs the difference of the reception timing of the click signal and click time data in embodiment, and detects a pair. It is a flowchart which shows the principal part of the transmission process in embodiment. It is a flowchart which shows the principal part of the reception process in embodiment. It is a flowchart of the audio switching process in embodiment. It is the schematic of the conventional performance system.

Explanation of symbols

  11, 21 ... Controller, 12, 22 ... Automatic performance piano, 12a, 22a ... Piano controller, 21f ... Switch module

Claims (2)

A performance that transmits performance data and an audio signal generated on the transmission side, receives the performance data and an audio signal on the reception side, and reproduces a musical sound based on the performance data and reproduces a sound based on the audio signal In the system,
On the reception side, based on the received performance data, the sound reproduction by the received audio signal is stopped when the musical sound is reproduced by the performance data, and the audio signal is reproduced by the audio signal when the musical sound is not reproduced by the performance data. A performance system characterized by that. A performance that transmits performance data and an audio signal generated on the transmission side, receives the performance data and an audio signal on the reception side, and reproduces a musical sound based on the performance data and reproduces a sound based on the audio signal In the system,
The receiving side includes a sound source that generates a musical sound signal according to performance data, and stops sound reproduction by the received audio signal when the volume level of the musical sound signal according to the received performance data is equal to or higher than a predetermined level. A performance system for performing sound reproduction by a received audio signal when the level is equal to or lower than a predetermined level.

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