KR970008442B1 - Demonstration method for the electronic musical sound instrument - Google Patents

Abstract

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Description

Demonstration method of electronic musical instrument

1 is a block diagram of an electronic musical instrument.

2 is a flowchart of a demonstration method of a conventional electronic musical instrument.

3 is a flowchart of a demonstration method according to the present invention.

4 is a diagram illustrating a memory map and a bitmap for demonstration.

* Explanation of symbols for main parts of the drawings

12: micom 14: tone selection key

16: Rhythm select key 18: Daemon key

20: sound source IC22: rhythm generator

24, 26, 28: tone filter 30: rhythm filter

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for demonstrating an electronic musical instrument, and more particularly, to a method for converting and outputting a musical tone or a rhythm during a performance of a demonstration song.

In general, an electronic musical instrument is an electronic musical instrument which reproduces and outputs an acoustic musical instrument electronically, a keyboard for selecting an octave of the musical instrument, a sound source generator for generating a sound source by pressing a key of the keyboard, and the sound source as a predetermined musical instrument. It consists of a tone filter section for filtering by tone.

The electronic musical instrument configured as described above has a demonstration function (hereinafter referred to as DEMO) that comprehensively shows the functions of the electronic instrument to children or beginners who handle the electronic instrument for the first time.

1 is a block diagram of an electronic musical instrument, which includes a program for the DEMO function and its data, and a microcomputer 12 for controlling a system for input / output signals, and a timbre selection for inputting a tone selection signal to the microcomputer 12. Key 14, a rhythm selection key 16 for inputting a rhythm selection signal to the microcomputer 12, and a demo (DEMO) key for inputting a demo (DEMO) signal for a demo function to the microcomputer 12; 18, a sound source generation integrated circuit (hereinafter referred to as a sound source IC) 20 for inputting sound source generation data of the microcomputer 12 to generate and output a tone and an ADSR, and to be operated by the control of the microcomputer 12; And a rhythm generator 22 generating a rhythm sound source by the microcomputer 12 data output, and controlled by the microcomputer 12, and filtering the output sound of the sound source IC 20 to a predetermined instrument tone. A, B, C audio filters 24, 26, 28 to be outputted, Code sound filter 30 which operates under the control of the microcomputer 12 and filters the code sound from the sound source IC 20, and the A, B and C tone filters 24, 26 and 28. And an amplifier 32 for amplifying the output of the cord filter 30 and a speaker 34 for outputting the output of the amplifier 32 in audible sound.

2 is a flowchart of a conventional DEMO method.

1 and 2, the operation of the conventional DEMO method will be described.

When the system of FIG. 1 is operated, the microcomputer 12 reads the port P1 and searches whether the DEMO key 18 is pressed in the process of FIG.

At this time, the DEMO key 18 is usually composed of a tact switch so that each time it is pressed, a corresponding signal is generated and input to the port P1 of the microcomputer 12.

If the DEMO key is pressed in step (51), the microcomputer 12 repairs the DEMO flag installed in the built-in memory in step 53, searches whether the DEMO flag is set in step 55, and presses the DEMO key. If not, proceed directly to (55).

If the DEMO flag is not set as a result of the search in step 55, the disable signal is output to the terminals C4 and C5 in step 57 to be disabled by the code filter 30 and the rhythm generator 22. Terminate the DEMO routine.

If it is determined in step 55 that the DEMO flag is set, the microcomputer 12 searches for the start point of the demo song in step 59, and if it is the start point of the demo song, initializes the DEMO in step 61. Run

In step 63, a melody counter (Melody Counter: MELCNT) for outputting one note data (Note Data) of the demo song and a chord data counter (Chord Data Counter: CHORDCNT) corresponding to the note data are cleared. do. In operation 65, the enable signal is output to the terminals C4 and C5 to enable the cord filter 30 and the lead generator 22.

In this case, the melody counter MELCNT and the code counter CHORDCNT are counters of software set in the microcomputer 12.

The microcomputer 12 performing the enable operation in the process (65) transmits the data of the internal memory, which is designated as the value of the memory + melody counter (MELCNT), to the sound source IC 20 in the process (67). Melody is generated from the IC 20.

When outputting data for generating a sound source in step (67), the sound source IC 20 generates a sound source sound corresponding thereto and inputs it to the tone filter 24, 26, 28 and the rhythm filter 30.

In step 71, the microcomputer 12 checks whether the most significant bit MSB of the melody data consisting of 8 bits is set.

The MSB of the melody data indicates whether or not the code data is output. When the code output is reset, the code is not output.

If the MSB of the melody data is set in the search of step (71), the microcomputer 12 outputs the code data designated as the value of "CHORD + code counter" (CHORDCNT) in step (73).

At this time, the tone filters 24, 26 and 28 are enabled and operated by the control of the microcomputer 12. When the DEMO function is executed, the microcomputer 12 outputs the terminals C1, C2 and C3. The enable signal is output to one of the terminals to enable only one tone filter of the three filters.

For example, if the A tone filter 24 is enabled, the sound source signal output from the sound source IC 20 is filtered by the A tone filter 24 and output as a signal of A tone (A musical instrument tone). A code tone is output from the filter 30.

In step 75, the melody corresponding to the note (note) of the currently output melody data is decremented (Melody lengthl MELENGTH), and in step 77, the MELENGTH is “0”.

At this time, MELENGTH in the process (75) is counted and decremented periodically in a timer interrupt.

If MELENGTH is "0" in step (77), MELENGTH is stored in the length data designated as the LENGTH and MELCNT sum value, and the DEMO routine is terminated.

However, the conventional DEMO method operated as described above has been problematic because it is not possible to change the instrument sound or rhythm by an external switch operation while DEMO is being executed.

In other words, the instrument sound and rhythm for DEMO are fixed only with the instrument sound and rhythm selected at the time of making the instrument, so there is no choice by external control. This has been a problem for listening to demo songs.

Accordingly, an object of the present invention is to provide a DEMO method that can change the tone and rhythm by external selection even when the DEMO song is played.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

3 is a flowchart of a demo method according to the present invention.

4 is a memory map and a demo bitmap for demonstration according to the present invention, where (A) is a memory map and (B) is a bitmap of melody data in the memory map of (A).

(C) is a bitmap of mode data in the memory map of (A).

An operation example according to the present invention will be described in detail with reference to FIGS. 1, 3, and 4 described above.

As described above, when the system of FIG. 1 is operated, the microcomputer 12 reads the port P1 in the process of FIG. 101 to determine whether the DEMO key 18 is pressed.

In step 105, if the search result is pressed, the DEMO flag is repaired in step 103 to determine whether the DEMO flag is set in step 105, and if it is not pressed, the process 105 is performed directly.

If the search result demo flag is not set (105), the microcomputer 12 outputs a disable signal to the ports C4 and C5 in step 107 as described above in the second step so that the code filter 30 ) And the rhythm generator 22 is stopped.

If the DEMO flag is set in step 105, the microcomputer 12 scans the input ports P2 ... Pn in step 109, and is the Any key pressed in step 111? Search for.

If the ANNY key is not pressed, it is determined that the instrument voice and rhythm which are set at the time of system production are not converted, and the process is performed (119). If the ANKEY is pressed, it is determined whether the key pressed in the (113) is the tone selection key Search.

In the case of the tone selection key, tone conversion is performed in step 115, and in case of no tone tone selection, the rhythm is changed in step 117.

For example, when the "A" voice corresponding key of the voice selection key 14 is pressed, the microcomputer 12 outputs the enable signal to the terminal C3 in step 115 to enable the A voice filter 24. Let's do it.

If the rhythm corresponding to "D" of the rhythm selection key 16, the microcomputer 12 is to output the rhythm data of "D" to the rhythm generator 22.

As described above, the microcomputer 12 converting the tone or rhythm searches for the start point of the DEMO song in step 119, and performs the steps 123, 125, and 127 as shown in steps 61, 63, and 65 of FIG. If it is not the starting point of the demo song, the DEMO turn is set (DEMO RUN Setting) in step 121.

In the above process, the microcomputer 12, which enables the code filter 30 and the rhythm generator 22 or sets the demo run, is recorded in the internal memory in the process of "129". (MELCNT) " accesses the data in the designated address and transmits it to the sound source IC 20.

At this time, the microcomputer 12 has a memory as shown in FIG. 4A.

In the memory as shown in FIG. 4A, the melody, length, and chord of the demo song are divided and recorded.

The melody data format has 8 bits as shown in FIG. 4 (B), where one bit of the most significant bit MSB indicates the presence of a code conversion, and the remaining bits are note data.

LENGTH indicates the length of each note constituting the melody.

Therefore, the number of melody data is equal to the number of LENGTH data.

The CHORD data type is composed of 8 bits as shown in Fig. 4 (C), and the upper 2 bits of the 8 bits are bits indicating whether the code character is MAJOR, MINOR, or SEVENTH. The remaining six bits are code data.

For example, if two bits of data defining the character of the code are MINOR and six bits of code data are "C" codes, this code is C minor (Cn) code.

Meanwhile, the sound source IC 20 inputting the melody note data output in step 129 generates a sound source and inputs the corresponding sound source to the A, B, and C tone filters 24, 26, 28.

At this time, if only the A tone filter 24 of the A, B and C tone filters 24, 26 and 28 is enabled, the sound source signal output from the sound source IC 20 is filtered by the A tone filter and A The signal of the tone is amplified by the amplifier 32 and converted into an audible sound by the speaker 34.

The microcomputer 12 outputting the melody data in step 129 detects whether the MSB of the melody data is set in step 131 and determines whether to output the code data.

If the code result of the search result is outputted, the code data of "CHORD + CHORDCNT" address is read and transmitted to the sound source IC 20 in FIG. 4 (A), and the code data is incremented each time the code data is read. Increases the contents of the code counter (NORDCNT) by +1.

The MELOOY LEONGTH data of the address "LENGTH + MELCNT" is stored in MELENGTH in step 137, and in step 139, MELCNT is increased by +1 and terminated.

In this case, the melody data is a length of melody data (for example, a sixteenth note, an eighth note, a quarter note, a half note, a whole note), and the like.

On the other hand, the microcomputer 12 storing the melody length in MELENGTH in step (137) is -1 decrements the content in step 141 of MELENGTH every time a predetermined time is interrupted by a built-in timer, and in step 143, MELENGTH Searches for "0".

If the content of the MELENGTH is not "0" in step 143, it is determined that the melody is not output as much as the melody length, and the DEMO run is reset in step 145 so that the melody corresponding to the length is output.

Therefore, the data transmitted to the sound source IC 20 in the above-described process (129) and (133) is continuously output.

When the content of MELENGTH is counted by the operation of the timer interrupt routine described above, and MELENGTH is determined to be "0" in step 143, it is determined that the sound is output as long as the melody data note length and the demo run is set.

Therefore, the microcomputer 12 periodically performing the demo routine of FIG. 3A determines that the DEMO run is set in step 121, and repeats the above-described operation.

As described above, when the tone selection key or the rhythm selection key is pressed while performing the demo routine, the microcomputer 12 converts the tone or rhythm by performing the above-described processes (109) to (117).

For example, if a tone "B" is selected as the tone A, the microcomputer 12 outputs a low disable signal for C1 and C3 and a high enable signal for C2 by the operation of the above-described process. Only the tone filter 26 is enabled.

In the rhythm, the microcomputer 12 converts the rhythm data output to the rhythm generator 22 to change the rhythm pattern.

If the DEMO key 18 is pressed while performing the DEMO function as described above, the demo flag is reset as the DEMO flag is repaired in step 103.

Therefore, the microcomputer 12 disables the cord filter 3C and the rhythm generator 22 in step 107 to terminate the DEMO.

As described above, the present invention has an advantage of improving the demonstration function since the instrument voice and the rhythm pattern can be changed by external control during the demonstration function.

Claims (1)

It has a melody data and each note, length and code constituting it in the internal memory area, and analyzes an input key signal to control the system 12 and a voice selection key for inputting a tone selection signal to the microcomputer 12. 14, a rhythm selection key 16 for inputting a rhythm selection signal to the microcomputer 12, and a demo (DEMO) key for inputting a demo (DEMO) signal for a demo function to the microcomputer 12 ( 18) and a sound source generation integrated circuit (hereinafter referred to as a sound source IC) 20 which inputs sound source generation data of the microcomputer 12, generates and outputs the sound source, and is operated by the control of the microcomputer 12 and the microcomputer 12; (12) A rhythm generator 22 which generates a rhythm sound source by data output, and A which is enabled by the control of the microcomputer 12 and filters the output sound of the sound source IC 20 to a predetermined instrument tone. , B, C tone filters 24, 26, 28, and In the demonstration method of the electronic musical instrument which consists of the code sound filter 30 which is operated by the control of the computer 12, and filters and outputs the code sound from the sound source IC 20, every time the demo key is pressed; A first step of complementing the demo flag and searching whether the demo flag is set, a second step of disabling the code filter and the rhythm generator when the 4 demo flags are reset in the first step; A third step of scanning a key when the demo flag is set in the first step and converting a tone and a rhythm in response to an input key when the key is input; and demo songs stored in the internal memory of the microcomputer 12 after performing the third step. And a fourth step of outputting the melody data, the code data and the rhythm data to the sound source IC (20) and the rhythm generator (22).

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