JPS647396B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to an automatic score transcription device that automatically displays music played on a keyboard on a staff. It is an object of the present invention to provide an automatic musical notation device capable of displaying the notes of a song played on a keyboard on a staff at the timing of key release, and controlling the interval between the displayed notes according to the note length. That is, according to the present invention, key information and note length information indicating the pitch and note length generated in connection with a key press on a keyboard are latched based on a key release on the keyboard, and the latched information is output. At the same time, outputting a display interval control signal corresponding to the note length information,
Musical notes are displayed based on the key information and note length information, and the displayed notes are advanced and the note spacing is controlled based on the display interval control signal. The present invention will be described in detail below with reference to the accompanying drawings. The figure is a block diagram showing an embodiment of an electronic musical instrument having an automatic score transcription device according to the present invention, which generates musical tones based on key presses on the keyboard 1 and automatically displays notes corresponding to the musical tones on a staff. It is something. Keyboard 1 has key information (key code) KC indicating the pressed key corresponding to the key pressed on keyboard 1 and the corresponding key code.
A key-on signal KON indicating whether the key corresponding to KC is pressed is generated. key code KC
For example, as shown in Table 1, the 3-bit octave code B ₃ , B ₂ , B ₁ represents the octave range.
and 4-bit note codes N ₄ , N ₃ , N ₂ , and N ₁ representing 12 note names within one octave.

【table】

[Table] The musical tone forming circuit 2 forms a musical tone signal based on the key code KC and the key-on signal KON generated from the keyboard 1, and applies this signal to the speaker 4 via the amplifier 3. As a result, the speaker 4 produces a sound corresponding to the key pressed on the keyboard 1. The autorhythm device 5 is used for automatic rhythm performance, and a tempo oscillator 6 generates rhythm sound signals representing various rhythm instrument sounds in response to a rhythm selected by a rhythm selection switch (not shown). Occurs depending on the tempo clock TCL. This rhythm sound signal is also amplified by the amplifier 3 in the same manner as described above, and is emitted by the speaker 4 as a rhythm sound. On the other hand, the key code KC generated from the keyboard 1 is applied to the staff information conversion circuit 7, where it is converted into position information on the staff and output to the latch circuit 8. In addition, the key-on signal generated from keyboard 1
KON is added to the key on/off detection circuit 9.
The key-on/off detection circuit 9 outputs a pulse signal P _KON at the rising edge of the key-on signal KON, and outputs a pulse signal P KON at the falling edge of the key-on signal KON.
Output P _KOF . Note that the pulse signal P _KON is the key 1
It goes without saying that the pulse signal P _KOF indicates the key release point. The pulse signals P _KON and P _KOF output from the key-on-off detection circuit 9 and the tempo clock TCL oscillated from the tempo oscillator 6 are sent to the note length detection circuit 10.
added to. The note length detection circuit 10 uses a pulse signal
The time from P _KON until the pulse signal P _KOF is applied, that is, the key-on time, is detected by counting the tempo clock TCL, and the count value (note length data) is generated. Note that this note length detection circuit 10 is configured to correct the count value when the count value includes an error, and to generate note length data corresponding to the corrected count value. In other words, when the regular count value corresponding to a quarter note is, for example, 32, even if the actual count value does not match the regular count value, such as 30 or 34, the note length data corresponding to the regular count value is It is now being output. Note length data generated from the note length detection circuit 10 is applied to a note information conversion circuit 11 and a display interval control circuit 12. The note information conversion circuit 11 outputs note information indicating a predetermined note to the latch circuit 8 based on input note length data, and outputs note information indicating a predetermined note to the display interval control circuit 1.
2 outputs a display interval control signal corresponding to the input code length data to the latch circuit 8. Similarly, the rest length detection circuit 13 receives a pulse signal.
The time from P _KOF to when the pulse signal P _KON is applied, that is, the key-off time, is detected by counting the tempo clock TCL, and the count value (note length data) is added to the display interval control circuit 12 and the rest information conversion circuit 14. , the display interval control circuit 12 outputs a display interval control signal corresponding to the input note length data to the latch circuit 8, and the rest information conversion circuit 14
outputs rest information indicating a predetermined rest to the latch circuit 8 based on input note length data. Note that the rest length detection circuit 13 detects the note length data only when it detects the note length data, that is, the key-on signal.
A pulse signal (“1”) is output to the AND circuit 15 at the rising edge of KON. The latch circuit 8 receives the pulse signal P _KOF from the key on/off detection circuit 9 via the OR circuit 16 to the load terminal.
When joining LD, position information on the staff to be input,
The note information and the display interval control signal are latched and guided to the output control circuit 17, respectively. Output control circuit 17
outputs position information on the musical staff and note information at the timing of inputting the pulse signal _PKOF , and subsequently outputs a display interval control signal. Note that when the rest length detection circuit 13 detects note length data and outputs a pulse signal (“1”) to the AND circuit 15 and the AND circuit 15 becomes operable, the key-on-off detection circuit 9 outputs a pulse signal (“1”). The pulse signal P _KON is sent to the latch circuit 8 via an AND circuit 15 and an OR circuit 16.
It is added to the load terminal LD. As a result, the latch circuit 8 latches the input rest information and display interval control signal and guides them to the output control circuit 17, respectively.
The output control circuit 17 outputs rest information at the timing of inputting the pulse signal P _KON , and subsequently outputs a display interval control signal. The display device 18 displays musical notes on its display section 18a on a liquid crystal display based on the position information on the musical staff and musical note information output from the output control circuit 17, and then displays the notes on the display section 18a based on the display interval control signal outputted subsequently.
Shift the displayed notes to the left. Here, the amount of shift to the left, that is, the display interval of each note, is set as shown in Table 1, for example, assuming that a quarter note is 1.

[Table] As is clear from Table 1, a half note is not twice as long as a quarter note, but the display interval is wider than that of a quarter note. Note that the score display is not limited to the LCD display. Various displays such as a CRT display are possible. Also,
Display intervals are similarly set for dotted notes, rests, etc. that are not displayed in Table 1. However, notes and rests from the same calendar time should be displayed at the same interval. The printer 19 prints notes on the print paper 19a based on the position information on the staff score and the note information output from the output control circuit 17, and then prints the notes on the print paper 19a based on the display interval control signal output.
Proceed with 9a. As explained above, according to the present invention, the notes of a song played on the keyboard can be displayed on the staff at the key release timing, and the intervals between the displayed notes can be changed depending on the note length. This makes it possible to display musical scores in an easy-to-understand manner.

[Brief explanation of drawings]

The figure is a block diagram showing an embodiment of an electronic musical instrument having an automatic score transcription device according to the present invention. 1...Keyboard, 2...Tone forming circuit, 3...Amplifier, 4
... Speaker, 5 ... Autorhythm device, 6 ... Tempo oscillator, 7 ... Staff information conversion circuit, 8 ... Latch circuit, 9 ... Key on-off detection circuit, 10 ... Note length detection circuit, 11 ... Note information conversion circuit, 12 ...Display interval control circuit, 13...Rest length detection circuit, 14...Rest information conversion circuit, 17...Output control circuit, 18...Display device, 19...Printer.

Claims (1)

[Scope of Claims] 1. Means for generating key information indicating pitch and note length information indicating note length in relation to key presses on a keyboard; and means for generating the key information and note length information based on key releases on the keyboard. output control means for latching the key information and outputting the latched information and outputting a display interval control signal corresponding to the note length information; displaying a note based on the key information and the note length information; and display means for controlling intervals based on the display interval control signal.