it is convenient and reliable to use a personal computer mounted software based on this invention for personal use . of cause , personal computer can be used for other purpose , when compared with the other option of using a specially designed hardware . not only crt , but also lcd ( liquid crystal display ) is available through the same connector on personal computer . lcd is suitable to set on a piano or put on high place . foot switch as well as mouse can be connected through connector for mouse or usb connector . audio input and output are common now . sensor of baton movement is special . it can be made up as electronic equipment box connected to personal computer through usb . when utilizing by video signal analysis , video capture board is available . detection of conductor &# 39 ; s takt is option in the system . tablet pc is fit to use at orchestra or ensemble . two tablet pcs in portrait posture are used for the conductor . one for each player or one for two string players are prepared . music stand may be smaller than conventional one and no necessary for lamp . all pc are connected with lan . wireless lan is enough capacity and is convenient . tablet pc has input of pointing , and this is very effectively used for communication between conductor and players with this invention . for group playing on the same music score may have one tablet pc and only displays for others to reduce the cost . image is supplied from the tablet pc through a distributor . it is good to have a server pc , which has bulk data read / write device such as cd or dvd . this pc delivers music score information , and executes following up playing position , and broadcasts internal music time and clocks to all other terminals . the pc also records and reads / writes of customized data to disk and media . video analysis requires big computation power , and so it is better to prepare one dedicated computer for this purpose . fig7 shows schematic diagram of programs and data , which constitute an embodiment of this invention . peripheral devices outside of main machine 100 are as follows . combined display and tablet 101 is a flat panel display covered by a transparent tablet . with tablet pc , device 101 is built in main body . removable memory media 102 and device to read or write on it are standard one such as flexible disk , cd dvd and memory stick . mouse 103 may be replaced by two foot switches operated by both feet . takt detector 104 is built with techniques shown in such as reference 4 . different sensors are used by techniques . all these are interfaced with such as usb , and input signals are analyzed by detection program . in case using video analysis , detection is executed in another computer and takt information is take in through lan . here these details are omitted . standard built in audio input circuit takes in signal of microphone 105 , and also , programs for sampling and digitizing 113 are generally provided . midi signal source 116 is such as rhythm machine or music sequencer which generates timing signals , or electronic keyboard . interface circuit and program for midi input 114 can be installed easily as standard option . plural display terminal can be connected through lan interface 107 . typical lan is high speed wireless lan defined by ieee 802 . 11 . in fig7 , program units are shown by rectangle with double bars in right and left sides , and data units are shown by lozenge , data references are shown by arrow solid line , and queues of program are shown by dotted arrow line . in the figure , data units 401 to 405 at left side are stored or transferred as file between internal disk , removable memory media or other computer through lan . data units 411 to 414 in the middle are temporary . display is based on window and drawn through window managing program 111 . tablet input are given by tablet managing program 112 in form of position in the window . characters printed on tablet are also recognized here . communication through lan is serviced at lan service program 115 . these programs 111 to 115 are provided with general operating system and not described here . programming style is like on - line real time control program . each program unit called task is queued by some event or queued from other task and generally stops after complete programmed procedure and then wait next queue . so , there is no total flowchart and each program unit is not part of it . as queuing event , there are input from external device , input from tablet , queue from lan , and interrupt from internal timer . pseudo buttons placed in display as well as touch on music score display cause queue . dialog task 200 is actually a group of element tasks . at the beginning , when there is starting queue to this music score display application , initialization task starts and uploads necessary tasks , and generates initial set dialogue , and waits for user input . if user requests general setting , corresponding task starts and enables setting about choice of portrait or landscape setting , choice of one display or two , choice of stand alone or group use , and in group use assign of this machine as master or slave . master machine generates internal music time and delivers it to slave machines . if there is no request , previous setting is adopted . now music piece selection task starts and lets user select music piece title . for selected music piece , music score information data 401 and its customized information data 402 to 405 are uploaded . if setting on the music piece dialogue is requested , its task starts and setting on repeats , cut positions if any , and number of takt per measure and its changing point are conducted . result of these setting is memorized in setting data 403 . after music piece setting dialogue closes in master machine , communication task 290 starts and broadcasts music piece selection and setting data 403 , if any change is . at each terminal music score drawing preparation task 210 starts . this task delimits whole music score into staffs according to music score information 401 , also selection of parts in each system and systems in page in conductor &# 39 ; s display . this procedure may involve trial and error . result of this music score drawing preparation task 210 is stored in allocation data 402 . with this data , transform from music time to page is easy , and drawing is processed without trial and error . allocation data includes corresponding table of rehearsal number and music time , so that quick response to conductor &# 39 ; s pointing of rehearsing portion in the music score . music score drawing preparation task 210 queues music score drawing task 220 at its end . music score drawing task 220 draws music score for each division of this invention from music score data 401 and stored in divided image data 411 . at the same time , pair data of note position and music time are stored in note position data 412 . and timing to renew that division is calculated and stored in renewal time data 413 . also , at each division queues display renewal task 240 . this is continued until fill all the first page . music score drawing task 220 further runs until drawing of the second page finished . after this , each time renewal takes place , task 220 draws image of next division . task 220 queues memo drawing task 230 each time it draws for a division . task 230 draws corresponding portion of memo stored in memo data 405 over image of the division . when user touches forward page turn button , one of dialog task 200 refers allocation data 402 and queues display renewal task 240 to renew display to the end of page , also queues music score drawing task 220 to draws music score in the next page . in case it is backward page turn button , task 240 write back to top of page and task 220 draws music score in the previous page . request in form of movement or rehearsal number is processed as follows . one of dialog task 200 get page number by refering allocation data 402 , and queues music score drawing task 220 to draw from the top measure of the page to the end of next page , and queues display renewal task 240 to renew one full page . when user scribes memo on the tablet in memo mode , memo drawing task 230 starts and draw as script , and stores it in memo data 405 . if it is not in memo mode , dialog task understands it as restart position , moves cursor to the point , find nearest note from note position data 412 , set internal music time to the music time of the note , then broadcasts the music time to other terminals through communication task 290 . if playing stops , this point can be restart point , or make comment on the point . now in the figure , internal music time is written as cmt . when pseudo start button is touched , it is understood that performing starts from cursor position , that is equal to internal music time data in 414 , performing music time follow up task 300 is queued . also , through communication task 290 set all other terminals in status of starting from the music time . then , performing music time follow up task 300 follows up the performance and queues cursor display task 260 to move cursor forward . at next takt time , task 300 queues renewal decision task 250 to check if internal music time reaches to timing stored in renewal time data . when it comes to the timing , task 250 queues display renewal task 240 to renew one division of music score display . and task 250 also queues music score draw task 220 to draw music score in the precedent division of next page . thus cursor display and renewal of music score display proceeds appropriately . when pseudo stop button is touched during playing , dialog task 200 stops performance music time follow up task 300 , also , queues communication task 290 to inform stoppage to all other terminals fig8 shows detail of an example of embodiment of performing music time follow up task 300 . program units are shown by rectangles with double bar in left and right side , or shown by hexagons if it has branch by decision , and data units are shown by lozenges . referencing of data are shown by solid arrow lines , and queuing between programs are shown by dotted arrow lines . only key words are written in boxes in the figure , and these contents are written hereafter . outer frame 300 is divided by dashed line into four areas 301 to 304 , which are corresponding programs of four levels timing input . area 301 related to first level timing input , that is clock input actually using computer internal timer . task 310 starts by queue from dialog task 200 , which means start command 200 a . if the program runs in the master computer , task 310 set start flag 431 as on , and enable all tasks in box 300 . also it sets timer with long time such as 5 seconds . additionally task - 310 sets internal periodical timer to periodically detect performance sound . task 311 starts by queue from dialog task 200 , which means stop command 200 b . task 311 sets start flag data 431 as off , disables all task in the box 300 . also , task 311 resets the timer not to cause interruption . task 312 and 313 are queued by timer interruption 301 a these two units are consecutively processed , so it is one task . double dotted line shows this as well as in other places . the task checks both flag 431 and 432 being on , and queues time renewal task 350 . and task 313 is for timer setting . if flag 431 is on , gets time duration to next clock and set the value to timer . the time duration is read out from time information data 404 corresponding to internal music time 414 , if it is in play back mode . if it is not in play back mode , clock duration is calculated from tempo stored in music score data 401 . if it is not play back mode but there are corrected duration data 436 and tempo is not changing according to music score data 401 , then it takes that corrected duration for timer setting . if it is in recording mode , duration data set to timer is also recorded into time information data 404 at the position of internal music time 414 . now , play back mode and recording mode are independent . duration correction task 314 is queued when there is higher than level 2 timing input . task 314 at first chooses the latest detection from detected takts data 434 and detected sound data 435 . if data from 434 and 435 are close each other , it takes higher level data 434 . it calculate duration per clock from the ratio of real time interval of chosen detection data and previous detected data and interval of two corresponding music time . it stores this data in corrected duration data 436 . if it is in recording mode , stores it in time information data 404 . writing position of this operation are all of clock position between time of latest detection data and time of previous data . value is the acquired data . in timer set program 315 , in play back mode , data comes from time information data 404 at the point of music time 414 . if it is not in play back mode , corrected duration data 436 is used as clock duration until next clock . if it is not in play back mode but music score information 401 indicate change of tempo , clock duration is calculated from music score information . in both case , set the timer with acquired duration . by this operation , old setting of timer is canceled by itself , and time is measured by new setting . area 302 in fig8 is related to timing input by detection of performing sound . task 321 to 323 is queued by interruption 302 a from said periodic timer . program 321 cuts out predetermined number of audio sampling data , which audio input program 113 has buffered . it memorizes input time of center data as acquisition time . filtering program 322 collects level data for each filter installed for each music tone . program 323 detects rising up of each music tone , by catch up change more than threshold between current level and previous level . detected rising up , its tone and acquisition time , are sent to next queued task 324 . task including programs 324 to 329 is queued by task 323 or interruption by midi key input 114 a . program 324 detects coincident between current detected tone and expected tones from music score information data 401 within some allowance range around the timing of internal music time . if no coincident found , buffering program 325 stores pair of detected tone and its acquisition time in played sound buffer 433 . decision program 326 decide if the number of detected tones in the buffer 433 reaches the predetermined number , and if it reaches , go to matching program 327 , and if not , stop the own task . if program 324 decides as coincident , program 328 resets number of buffered tones to 0 , and go to program 329 . program 329 checks that flag 432 is on and music time of detected tone is not near to any of detected takts data 434 , and if it fits , queues music time renewal task 350 and duration correction task 314 . then stores internal music time and its acquisition time as recent detection up to predetermined number . program 327 does matching between data in the buffer 433 and music score information 401 . it sets tone , its sequence , and each interval as retrieving pattern . also , it picks up same number of adjacent tones from music score data 401 around the music time in data 414 as matching pattern . if retrieving pattern and matching pattern matches within allowance range of error in time intervals , it is successful and go to program 329 with data of music time of the last tone in the matching pattern and acquisition time of corresponding detected tone . if it does not match , move pick up position back and forth and try again . continue trial until move width reach certain amount and if not successful , stop the own task . area 303 is relating to timing input from detection of conductor &# 39 ; s takt . takt detection device 104 sends timing signal 104 a , and this interrupt signal queues check task 331 . task 331 checks that flg 2 432 is on , and there is no near direct input referring detected takts data 434 , and if they are , queues task 343 . area 304 is relating to timing input from level 4 direct input . event signal 103 a of on or off from input device , which has two buttons such as mouse or foot pedals , queues task 341 to 342 . if it is right button , program 341 send it to program 342 . program 342 sets flg 2 in reverse to input signal . during right button is pushed down , flg 2 is off , and renewal of clock duration is halted . this is because play position is at portion with unusual tempo , or user is adjusting internal music time . if input signal is on change of left button , it is taken as direct input of takt . for off change of left button , there is no action . task 343 to 344 find out music time corresponding to the takt input . if flg 2 432 is on , music time of an eligible takt nearest to internal music time 414 is chosen . if flg 2 is off , music time of an eligible takt next nearest from internal music time 414 referring to music score information 401 id chosen . internal music time 414 is music time that the system is holding inside , and may jolt out of alignment with sounding performing music time . in case misalignment grow to a few takt , user can let system catch up by holding right button and making extra click on left button , or wait performing comes to internal music time by just holding right button . program 343 queues renewal time task 350 with acquired music time and real time input happened . next program 344 memorizes music time and real time of takt input into detected takts data 434 . only fixed number of data are kept in this data 434 and older data are overwritten . task 350 to 351 consolidates timing inputs from four levels and from external . task 352 receives timing signal from external timing master . if setting for this computer is slave mode , this receives time renewal signal 290 a from communication task 290 . or in other case that master is sequencer , midi instruments , or rhythm machine , task 352 accepts timing signal 114 b from midi interface 114 . in this latter case , music time does not come , and this task holds current music time renews it when it receives clock signal referring to music score information 401 . so , in both case , task 352 queued task 350 with music time and its real time . program 350 renews internal music time 414 to music time brought in . data is memorized with its real time . then program 351 queues renewal decision task 250 and cursor display task 260 . if the computer is the timing master , program 351 delivers music time and its real time to other computers through communication task 290 . an embodiment of performing music time follow up function in this invention is described above . it can utilize four level timing input according to their priority . current music time is kept , is referred from other program and is delivered to other computers . above described embodiment is available for both playing alone or playing with group . hereinafter composition and function in use for orchestra is described in more detail . one computer is used as a data server , and executes read write of removable media or mass library storage , and deliver data to other computers . also , the computer is assigned as a timing master , which executes performing music time follow up function 300 . exclusive operator , if there is , makes necessary correction of music time by direct input to this computer . so , the operator should keep visual and audio communication with the conductor , catch even soft voice , but may be at place not visible from audience . other computers are set as timing slave , and receive music time delivery and execute display renewal by it . computer for the conductor is set as operation master . conductor can specify restart position by touch on the point in displayed music score during stop status . during start status , music time of touched position and part are memorized for later review , so system helps to go back to the point to be reviewed . touch during public performance can be used adjust timing on the fly , when misalignment happens between orchestra and soloist , this touch position translate into music time and delivered to all other computer and displayed with special mark . display at conductor &# 39 ; s terminal is so frequent and needs processing power that it may be different machine with the data server . operation of start or stop may be done by conductor , but if there is a dedicated operator , the operator should do this . operator also directly input the first down beat . because time from pushing start button to the first takt is once set as 5 seconds , but actually it vary time by time . if automatic performing sound detection or takt detection works well , it is not necessary for operator to input this . the timing master plays back time information 404 , or records time information , and manage its file . so for example , it is possible to respond to the request to play back with timing data of certain day &# 39 ; s rehearsal . computers at players make allocation data 402 according to music score information of the part and prepares for display . memo writing on music score is supported . in case there is no exclusive operator , assigned player make adjustment using foot pedal as direct input , this input forwarded to timing master computer . now , hereinafter described is another embodiment , which is expansion of direct input in the performing music time follows up function 300 . one of the points of expansion is use of touch panel on the display . touching on note , rest , or bar specify music time of touched note or object is performing music time of the moment of touch . this operation can specify music time more directly and without ambiguity than mouse or foot pedal . preliminary set is necessary , that touching in start status is taken as input of timing and music time . for this operation , operator whose hand is free is necessary . so , assistant not playing or player who is not playing at the portion of music piece does this . second expansion is that mouse or foot input has multiple meanings to be chosen at setting dialogue . in former embodiment , direct input is taken as same frequency with takt , so , input takt is connected to the takt nearest from internal music time . but , one click is not enough to adjust more than two takt misalignments between performance music time and internal music time . to do it with foot pedal during play is a little hard thing . then , if change of interpret of input timing to not takt but head of measure or more bigger head of staff , one click can adjust big misalignment . program may find nearest bar or head - of staff from the current internal music time , and replace current time to found time at the input timing . user can set by setting dialog which of takt , bar or staff does adjusting timing input means . further more , adjusting points may be displayed in music score with special mark like pedal mark for piano music score . places of the mark are selected in consideration on easiness of foot operation such as in the rest and provided with music score information . user input only when there is misalignment between internal music time and performing music time at the point of these special marks , which is different with conventional pedal mark for piano . use of direct input for these special mark is set preliminary . this invention provides music score display of all music scenes , such as solo , ensemble , orchestra , band , opera , or musical . also , it is applicable to any ethnic music with different notation with western music . this system is effective to both beginner and professional users . time efficiency is improved much for orchestra rehearsals . soloists will be free from pressure of play from memory . it can be used at concert as well as in training room , or at individual home . this invention can be provided as application program for personal computer , computer system preinstalled program of this invention , or system of networked computers .