JPS58220193A - Electronic musical instrument - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electronic musical instrument with waveform memory reading [7 methods].
In particular, the present invention relates to the ability to store desired musical tone waveforms and envelope waveforms in a waveform memory.

Conventionally, electronic musical instruments using the waveform memory read-out method have read-only memos in advance of the musical waveforms of various musical instruments! J@0IV), and is configured to generate musical tones by reading out the stored musical sound waveforms in response to key depressions.

However, such electronic musical instruments have a drawback in that the musical sound waveforms are stored in a read-only memory, and therefore the stored musical sound waveforms cannot be freely changed by external operations.

SUMMARY OF THE INVENTION An object of the present invention is to provide a tone waveform setting device that sequentially outputs data corresponding to the specified positions by sequentially specifying positions on a plane corresponding to a desired tone waveform; It is equipped with a musical sound waveform data storage device that stores output data as musical waveform data, and a musical sound generator that generates musical tones based on the musical sound waveform data read from the musical sound waveform data storage device, and can set any tone. This allows flexibility in tone selection. This will be explained in detail below using examples.

FIG. 1 is a block diagram showing an embodiment of an electronic musical instrument according to the present invention. In the figure, reference numeral 1 has a key switch corresponding to each key on the keyboard section, and when a certain key is pressed, the corresponding key switch operates, and from its output a key code KC corresponding to the pitch of the pressed key is generated. A key switch circuit configured to output. In response to the sending of the key code KC, the key switch circuit 1 also outputs a key-on signal KON (11'' when the key is being pressed) indicating that the key is being pressed.

2 is the key code KC output from the key switch circuit 1
A latch circuit launches and stores the key-on signal KON at the rising edge of the key-on signal KON, 3 is a note clock generation circuit that outputs a note clock signal NCK having a frequency corresponding to the key code KC supplied from the latch circuit 2, and 4 is the note clock mentioned above. This is a tone address signal generation circuit that supplies the tone waveform data memory 5 with an address signal CAD that sequentially changes with the cycle of the note clock signal NCK supplied from the generation circuit 3. This musical tone address signal generation circuit 4 receives a key-on signal KOH supplied from the key switch circuit 1.
The tone waveform data memory 5 consists of a counter that is reset by the rising edge of and counts the note clock signal NCK from the note clock generation circuit 3, and uses the count value of the counter as the address signal CAD.
supply to. The musical sound waveform data memory 5 is, for example, an RA.
It consists of M (random access memory),
When the mode setting signal r'lsa supplied from the tone waveform setting device 6, which will be described later, becomes 1''1'', it operates in the write mode, and when the mode setting signal MSa becomes 0, it operates in the read mode.The tone waveform When the data memory 5 is set to the write mode, it stores the musical tone waveform data GD supplied from the musical tone waveform setting device 6 at the address designated by the write address signal WADa also supplied from the device 6, and on the other hand, When the read mode is set, the memory contents of the addresses specified by the address signal CAD supplied from the address signal generation circuit 4 are sequentially read out.The read memory contents, that is, the musical waveform data GW are sent to the multiplier 7. supplied, multiplier 7
The output data is converted into an analog signal by a digital-to-analog converter 8 and then supplied to a sound system 9.

Reference numeral 10 denotes an envelope address signal generation circuit, which generates an attack clock pulse ATP supplied from an attack clock pulse generator 11 or a decay clock pulse DEP supplied from a decay clock pulse generator 13.
An address signal EAD that changes sequentially with a period of is supplied to an attack envelope waveform data memory 12 and a decay envelope waveform data memory 14. The envelope address signal generation circuit 10 is configured as shown in FIG. 2, for example. That is, by being supplied with the key-on signal KON supplied from the key switch circuit 1, the one-shot circuit 10a outputs a short pulse width one-shot pulse EP, and is reset by the one-shot pulse EP. A 2N counter 100 that counts output pulses from the OR circuit 10b, an attack clock pulse ATP supplied from the attack clock pulse generator 11, and the key-on signal K.
ON and an output signal X1 from a detection circuit 10d to be described later, and an AND circuit 10e which supplies the AND output to an OR circuit 10b, a decay clock pulse DEP from the decay clock pulse generator 13, and a key-on signal. It is composed of an AND circuit 10g which inputs an output signal KON obtained by inverting KON with an inversion circuit 10f and an output signal X from the detection circuit 10d, and supplies the AND output to the OR circuit 10b. Ru.

The counter 10c counts the output pulses from the OR circuit 10b, and outputs other bit signals except for the most significant bit signals M and SB among the parallel bit signals corresponding to the count value as an address signal EAD and 1 to 1. do. In addition,
The most significant bit signal MSB of the above parallel bit signals
is supplied to the enable terminal E1 of the attack envelope waveform data memory 12 via the inversion circuit 15, and further supplied to the enable terminal E of the decay envelope waveform data memory 14.

Here, as shown in FIG. 3(b), when the count value of the counter IQc changes from O to 2Nt, the counter 10
The most significant bit signal MSB of c has a count value of N+1.
When it becomes, it changes from "0゛1" to "I11". That is, the bit signal MSB is 1'0'' when the count value of the counter 1oc is θ to N, and this count value is N+1.
˜2N, it becomes 111n. Therefore, counter IO
When the count value of C is 0 to N, the input of the enable terminal E of the attack envelope waveform data memory 12 is I.
The attack envelope waveform data memory 12 becomes ready for output. Therefore, addresses of attack envelope waveform data memories 1200-N are designated by address signals EAD (0-N) corresponding to count values 0-H. Further, when the count value of the counter 10c is N+1 to 2N, the input of the enable terminal E of the decay envelope waveform data memory 14 is nu.
Decay envelope waveform data memory 1
4 becomes an output ready state. Therefore, count value N+
Addresses 0 to N of the decay envelope waveform data memory 14 are specified by address signals EAD (θ to N) corresponding to 1 to 2N. The detection circuit 10d is a counter 14
When the bit signal MSB of the most significant digit of
), and when the most significant bit signal MSB is "1", the signal X shown in FIG. 3(d) is output.

Next, the operation of the envelope address signal generation circuit 10 will be explained.

When a key-on signal KON of "1" is supplied from the key switch circuit 1 when a key is pressed, the AND condition is satisfied while the signal X1 of the detection circuit 10d is llll11, and the attack clock is Pulse generator 1
The attack clock pulse ATP from 1 is AND circuit 1
The signal is supplied to the counter 100 via the 0e1 OR circuit 10b. The counter 10C outputs an address signal EAD that changes sequentially with the period of this clock pulse ATP, and sequentially specifies addresses 0 to N in the attack envelope waveform data memory 12. On the other hand, since the output signal KON of the inverting circuit 10f is IIO11 at this time, the gate of the AND circuit 10g is closed. Here, the address of the attack envelope waveform data memory 12 is N1.
When specified by , the output signal X8 of the detection circuit 10d becomes 1IO
1', the AND circuit 10e closes the gate.

In this case, the counter 10c stops counting.

Next, when the key is released and the key-on signal KON supplied from the key switch circuit 1 becomes "On", the inverting circuit 10f
Therefore, the output signal KON becomes "1", and the detection circuit 1p
Since the signal X of 11'1 is output from d, the AND condition of the AND circuit 10g is satisfied, and the decay clock pulse DEP from the decay clock pulse generator 13 is sent to the counter 10c via the AND circuit 10g1 and the OR circuit 10b.
will be supplied to. The counter 10c counts the decay clock pulse DEP from the decay clock pulse 13, outputs an address signal EAD that changes sequentially with the period of this clock pulse DEP, and sequentially reads the addresses of the decay envelope waveform data memories 1400 to N. specify.

The attack envelope waveform data memory 12 operates in the write mode when the mode setting signal MSb supplied from the attack envelope waveform setting device 16 (described later) reaches 1°1, and the attack envelope waveform setting device 16 operates in the write mode at the address specified by the address signal WAD. Write the Axok envelope waveform data AED output from. When the mode setting signal MSb supplied from the attack envelope waveform setting device 16 becomes II O11, it operates in read mode 7, and the address signal EAD supplied from the envelope address signal generation circuit 10 changes the memory contents of the specified address. Read out. Further, when the mode setting signal MSc supplied from the decay envelope waveform setting device 17, which will be described later, becomes ``1'', the decay envelope waveform data memory 14 operates as a ride mode, and decays to the address specified by the address signal WADC. Decay envelope waveform data DED output from the envelope waveform setting device 17 is written. When the signal MSc becomes "0", it operates in a read mode and reads out the stored contents of the address specified by the address signal EAD supplied from the envelope waveform address signal generation circuit 1o. Attack envelope waveform data y1 corresponding to the attack waveform of the envelope waveform read from the attack envelope waveform data memory 12 and decay envelope waveform data y corresponding to the decay waveform of the envelope waveform read from the decay envelope waveform data memory 14. , is supplied to a multiplier 7, multiplied by the tone waveform data GW output from the tone waveform data memory 5, converted into an analog signal by a digital-to-analog converter 8, and supplied to the sound system 9.

Each of the waveform setting devices 6, 16, and 17 has a plurality of signal lines 18 arranged in a fixed direction, and a spacer 19 for each signal line 18, as shown in FIGS. 4 to 6, for example. A plurality of signal lines 20 arranged so as to maintain an orthogonal state, a storage section 21 for storing each of these signal lines 18 and 20 and a spacer 19, and an insulating material arranged to cover each of the signal lines 20. The waveform writing sheet 22 is composed of: The signal lines 18 and 20 are always separated, but as shown in FIG. 5, when a waveform is written on the waveform writing sheet 22 with a writing instrument T, the portion of the waveform writing sheet 22 pressed by the writing instrument T is downward. The signal lines 18 and 20 at positions corresponding to the suppressed portions of this writing instrument T are bent by this.
The cross points of the two contact each other and conduct electricity. In this case, each signal line 18 has a counter 2 as shown in FIG.
A signal of "1°" is sequentially supplied in a time-division manner from the decoders 2 and 4 driven by the output signal from the signal line 3, and the output signal from each signal line 20 is input to the encoder 25.The output of the encoder 25 The signal is the above musical waveform data GD
Alternatively, it is supplied to each memory 5.12.14 as envelope waveform data AED, DED. Note that the counter 23 counts clock pulses φ generated from a clock pulse generator (not shown), supplies this count output to the decoder 24, and uses this count output as the address signal WADa, WADb, or WADc to each memory 5.12. .14. Further, when a signal of PA1° appears on any of the signal lines 20, this signal is detected by the OR circuit 26, and the output signal of the OR circuit 26 is the mode setting signal MSa or MSa.
b or MSC to each memory 5.12.14. In this case, a priority circuit is added to the encoder 25, so that when a signal of 1'' appears on multiple signal lines among the signal lines 20, only the signal from the signal line that has a predetermined value of 1'' is output. configured to prioritize.

The operation of the electronic musical instrument of the present invention having the above configuration will be explained below.

Each signal line 1 is output from the decoder 24 by the operation of the counter 23.
8 are sequentially supplied with the signals II, I, and 11, so that the desired musical sound waveform GDo is written on the writing sheet 22 by the writing instrument T.
is written, the signal line 18 corresponding to this waveform GDO
Since the cross point between and 20 becomes conductive, a signal of "1" appears on the signal line 20 corresponding to this conductive cross point. The encoder 25 supplies the value corresponding to the signal line 20 on which this "1n" signal appears to the tone waveform data memory 5 as tone waveform data GD. That is, the waveform GD
By setting the time axis of O as the arrangement direction of one of the signal lines 18, and drawing the waveform GDO along this time axis with a writing instrument T,
Data corresponding to the amplitude of the waveform can be obtained from the encoder 25 via the other signal line 20, and is stored as musical waveform data GD in the musical waveform data memory 5 designated by the address signal WADa output from the counter 23. can be written to the address of

If you still want to write the attack waveform and decay waveform of the envelope waveform, you can write the predetermined envelope waveform on the writing sheet 22 of the attack envelope waveform setting device 16 or the decay envelope waveform setting device 17 using a writing instrument T. Attack envelope waveform data AED corresponding to the attack waveform drawn on the writing sheet 22 can be written from the envelope waveform setting device 16 to the attack envelope waveform data memory 12, and attack envelope waveform data AED corresponding to the attack waveform drawn on the writing sheet 22 of the decay envelope waveform setting device 17 can be written. It becomes possible to write the decay envelope waveform data DED corresponding to the decay envelope waveform obtained in the decay envelope waveform data memory 14.

Therefore, according to the electronic musical instrument according to the present invention, musical tones of desired tones can be written and read out, and desired envelope waveforms can also be written and read out.

In addition, in the invention described above, the waveform setting device was described as being configured with signal lines arranged in a matrix, but this invention is not limited to this, and can be applied to CRTs that output waveforms drawn with a light pen on a flat surface. [2] may also be configured using an imaging device consisting of:

In addition, when the waveform is symmetrical, such as a musical tone waveform, for example, only half a cycle of the musical tone waveform is set to 1 to 1 in the musical tone waveform setting device, and this is written to the musical waveform data memory, and read out when reading the musical tone waveform data memory. The signs of the half-cycle waveforms may be alternately changed.

Further, in the present invention, the waveform setting device has been described as being provided for each of the musical tone waveform data memory, attack envelope waveform data memory, and decay envelope waveform data memory, but the present invention is not limited to this, and only one waveform setting device is provided. This may be switched and shared for each waveform data memory.

Alternatively, a plurality of waveform data memories may be provided for each waveform setting device, and each waveform data memory may be switched.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of an electronic musical instrument according to the present invention, and FIG. 2 is a diagram showing details of the envelope waveform address signal generation circuit of the electronic musical instrument explained in FIG. 1.
FIGS. 3(a) to 3(d) are waveform diagrams for explaining the operation of the envelope waveform address signal generation circuit shown in FIG.
4 to 6 are a perspective view, a sectional view, and a simplified configuration diagram showing an embodiment of a waveform setting device used in an electronic musical instrument according to the present invention. DESCRIPTION OF SYMBOLS 1... Key switch circuit, 4... Musical tone address signal generation circuit, 7... Multiplier, 9... Sound system, 10... Envelope address signal generation circuit, 5.
... Musical waveform data memory, 6.16.17... Waveform setting device, 12... Actuation envelope waveform data memory, 14... Decay envelope waveform data memory, 18.20... Signal line, 22. -Writing sheet, 24...decoder, 25...encoder. Patent applicant Agent: Nippon Musical Instruments Manufacturing Co., Ltd.
Patent Attorney Jun Miyazono - GD (AED, DEC) WADa (WADb, WADc) MSa (MSb, MSc)

Claims (2)

[Claims] (1) A tone waveform setting device that sequentially outputs data corresponding to the specified position by sequentially specifying positions on a plane corresponding to a desired tone waveform. a tone waveform data storage device that stores output data of the tone waveform setting device as tone waveform data; An electronic musical instrument comprising: a musical tone generating device that generates musical tones based on musical sound waveform data read from the musical sound wave layer data storage device. (2) A tone waveform setting device that sequentially specifies positions on a plane corresponding to a desired tone waveform and sequentially outputs data corresponding to the specified positions. a tone waveform data storage device that stores output data of the tone waveform setting device as tone waveform data; An envelope waveform setting device that sequentially outputs data corresponding to the designated positions by sequentially designating positions on a plane corresponding to a desired envelope waveform. an envelope waveform data storage device that stores output data of the envelope waveform setting device as envelope waveform data; An amplitude control device that controls the amplitude of the musical tone waveform data read from the musical tone waveform data storage device by the envelope waveform data read from the envelope waveform data storage device. An electronic musical instrument comprising: a musical tone generating device that generates musical tones based on amplitude-controlled musical waveform data output from the amplitude controlling device.