JPH067335B2 - Music signal generator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention writes waveform data of an external sound inputted from the outside into a memory before playing, and reads out the written waveform data at the time of playing. By doing so, the present invention relates to a musical tone signal generator which generates a musical tone signal corresponding to the waveform data.

[Prior art]

As a conventional technique, a conversion means for inputting an external sound and converting the input external sound into waveform data in a digital format,
A memory for storing waveform data is provided, and the waveform data converted by the converting means is written in the memory before playing,
There is a type in which waveform data stored in a memory is read out and output at a rate corresponding to a specified pitch during performance so that a musical tone signal corresponding to an external sound can be generated as a performance sound.

[Problems to be solved by the invention]

However, in the above-mentioned conventional apparatus, the waveform data stored in the memory at the time of performance is read at a rate corresponding to the specified pitch, and the musical tone represented by the waveform data, that is, the external sound input before the performance is input. Since the sound is only pronounced with the tone color as it is, it is not possible to change the musical sound that is pronounced and to make a different musical sound from the external sound.
It lacked flexibility in the generation of musical sounds and was of little value in terms of music.

The present invention has been devised in view of such problems, and an object thereof is to allow a musical tone signal generating device such as the above-mentioned conventional device to change a generated musical tone to a tone different from an external tone. Another object of the present invention is to provide a musical tone signal generating device which has a high degree of freedom in the generation of musical tones and is highly useful in music.

[Means for solving problems]

In order to solve the above problems and achieve the object of the present invention, a structural feature of the present invention is to input an external sound and convert the input external sound into waveform data in a digital format; Memory for storing data, writing means for writing the waveform data converted by the converting means in the memory, and reading means for reading the waveform data stored in the memory at a reading rate corresponding to a designated pitch. With and
In a musical tone signal generating device for generating a musical tone signal based on the waveform data read from the memory, the waveform data from the converting means and the waveform data stored in the memory are combined and operated, and the operation result is obtained. Is provided to the memory to permit the writing of the calculation result by the writing unit, and a write rate setting unit that variably sets the waveform data writing rate by the writing unit.

[Operation of the invention]

In the present invention configured as described above, the synthesis operation means performs a synthesis operation on the waveform data from the conversion means and the waveform data stored in the memory, supplies the operation result to the memory, and writes the result by the writing means. Since the writing of the calculation result is allowed, after the first waveform data relating to the first external sound is stored in the memory, the second external sound different from the first external sound is stored.
The second waveform data relating to the external sound can be stored in the memory by being superimposed on the first waveform data, and as a result, the memory relating to a new musical tone different from the first external sound and the second external sound. Since the waveform data is stored, the new waveform data can be read by the action of the reading means to generate a new musical sound different from the external sound.

In such a case, when writing the first and second waveform data to the memory, the write rate setting means makes the write rates of the first and second waveform data the same, and
By selecting instrument sounds of the same frequency and different types as the first and second external sounds, the generated musical tone has a tone color that is a mixture of the first and second external sounds. Further, in this case, if the first and second external sounds of different frequencies are selected, the overtone structure of the musical sound represented by the synthesized waveform data corresponds to the first and second external sounds. It becomes complicated. Furthermore, the first and second
Even if the frequency of the external sound is fixed or the band thereof is limited, the writing rate setting means sets the writing rates of the first and second waveform data regarding the first and second external sounds to different rates. If set, the same result as when selecting different frequencies as the first and second external sounds is obtained. This makes it possible to easily synthesize musical tones having various tones.

Further, by using the combination calculation function of the combination calculation means and the write rate change function of the write rate setting means,
Before playing, the waveform data of external sounds of different frequencies are duplicated and written in the memory, and a single pitch designation is used to correspond to the same external sounds, and at the same time multiple musical tone signals of different frequencies, such as chord signals, are simultaneously processed. Can be generated. That is, for example, all external sounds having frequencies corresponding to the pitches C ₂ , E ₂ , G ₂ are sequentially written in the memory by designating the pitch corresponding to the pitch C ₂ , or the frequencies corresponding to the pitch G _2. If the external sounds of are sequentially written in the memory by the pitch designation corresponding to the pitches C ₂ , D ₂ #, G ₂ respectively, the pitch designation corresponding to the pitch C ₂ at the time of performance causes Pitch C ₂ ,
Musical tone signals corresponding to E ₂ and G ₂ can be simultaneously generated. Since the frequency ratio of these generated musical tones is fixed, various chords can be generated by changing the designated pitch when reading the waveform data. Further, in such a case, if the same instrument sound is used as the external sound, a chord by a single instrument is obtained, and if different instrument sounds are used as the external sounds, a musical sound such as an ensemble performance is obtained.

〔The invention's effect〕

As can be understood from the above description of the operation, according to the present invention,
By providing the synthesis operation means and the writing rate setting means, the tone color of the generated musical tone can be variously changed, or the generated musical tone can be made equivalent to that including a plurality of musical instrument sounds,
Since the degree of freedom of the generated musical sound is increased, the musical utility value of the musical sound signal generator can be enhanced.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.
FIG. 1 is a block diagram showing an example of an electronic musical instrument to which the tone signal generator according to the present invention is applied. In the figure, reference numeral 1 has a key switch corresponding to each key of the keyboard portion, and when a certain key is pressed, the corresponding key switch operates, and from its output, a note code NC corresponding to the pitch of the pressed key and The key switch circuit is configured to output a key code KC including a block code BC. Further, this key switch circuit 1 outputs a key-on pulse KONP having a short pulse width at the start of sending the key code KC. The key switch circuit 1 has a built-in single tone priority circuit, so that when two or more key switches are operated at the same time, only the key code KC corresponding to the key switch with high priority is output. Has been done.

2 is a key code KC output from the key switch circuit 1
The latch circuit 3 for latching and holding by the key-on pulse KONP holds a note clock signal 2 · NCK (FIG. 2 (a)) having a frequency twice as high as the frequency corresponding to the key code KC supplied from the latch circuit 2. Is a digital clock conversion circuit for picking up an input musical tone and sequentially converting it into digital musical tone data GDi corresponding to the input musical tone level and outputting the digital musical tone data GDi. The input musical tone is picked up by a microphone 40. Then, it is converted into a corresponding musical tone signal GA, and then converted into digital musical tone data GDi corresponding to the signal level by an AD converter (ADC) 42 via an amplifier 41. The digital conversion circuit 4 is provided with an input signal detector 43 for detecting the rising edge of the input musical sound,
When a musical tone having a certain level is input from the outside, the input signal detector 43 outputs a detection signal having a short pulse width at the time of rising of the input musical tone. This detection signal is a write command signal WR output from the memory control circuit 6 described later.
It is supplied as a trigger signal TRG to the memory control circuit 6 through the AND gate 44 which becomes operable.

Reference numeral 5 is a tone data memory for storing tone data, and the stored contents are cleared when a "1" signal is given from the clear switch CL.SW.

Reference numeral 6 supplies the tone data memory 5 with an address signal ADR which changes in a predetermined cycle, and at the same address time when the address signal ADR indicates the same address value, the mode of the tone data memory 5 is read in a time division manner. Mode control signal M for controlling the mode and the write mode
A memory control circuit for outputting D, which is a read clock pulse φ1 as shown in FIGS. 2 (b) and 2 (c) by dividing the note clock signal 2 · NCK from the note clock generation circuit 3. And a flip-flop 61 that outputs a write clock pulse φ2, and a write command switch W.
A one-shot circuit 62 that outputs a one-shot pulse WP having a short pulse width when a "1" signal is given by closing the SW, and an address end signal indicating that the address signal for the musical tone data memory 5 has reached the maximum value address. Is supplied, a one-shot circuit 63 that outputs a one-shot pulse EP having a short pulse width.
Is set by the one-shot pulse WP and reset by the one-shot pulse EP, and its Q
A flip-flop 64 that outputs a write command signal WR from the output, and an AND gate only when the inverted write command signal WR obtained by inverting the trigger signal TRG or the write command signal WR input through the OR gate 65 by the inverter 74 is "1". The note clock signal NCK 'or the read clock signal RCK which is reset by the key-on pulse KONP input via the OR gate 65 and the OR gate 66 and counts the count output to the tone data memory 5. Address signal A
Counter 67 which outputs as DR, and address signal AD
The NAND gate 68 which detects that the address content by R has reached the maximum value address and outputs an address end signal of "0" and the note clock signal 2 · NCK from the note clock generation circuit 3 are halved. When the frequency divider 73 for dividing and outputting the note clock signal NCK and the inverted write command signal obtained by inverting the write command signal WR by the inverter 69 are "1" and the address end signal is "1". Only 1/2 divider 73
AND gate 70 which passes the note clock signal NCK output from the counter and outputs the note clock signal NCK 'to the counter 67 via the OR gate 66.
And the flip-flop 61 only when the write command signal WR is "1" and the address end signal is "1".
An AND gate 71 that passes the read clock pulse φ1 output from the device and outputs it as the read clock signal RCK; and a NAND gate 72 that inputs the write command signal WR and the write clock pulse φ2 and outputs the NAND output as the mode control signal MD. Is equipped with. By the way, in this case, the tone data memory 5 has a mode control signal MD of "0" at its read / write control input terminal (R / W).
Is input, the write mode is set, and when the mode control signal MD of "1" is input, the read mode is set. Therefore, when the write command signal WR is "1", the mode control signal MD becomes a signal in which the write clock pulse φ2 is inverted (that is, the same signal as the read clock pulse φ1), and as a result, the tone data memory 5 is Figure 2
As indicated by the shaded portions in (b) and (c), the read mode is set when the read clock pulse φ1 is “1”, and the write mode is set when the write clock pulse φ2 is “1”. On the other hand, when the write command signal WR is "0", the mode control signal MD is always "1", and as a result, the tone data memory 5 is always in the read mode.

Next, 8 is an addition circuit for adding the musical tone data GDi output from the digital conversion circuit 4 and the musical tone data GDm read from the musical tone data memory 5 and outputting the added data as the synthesized musical tone data GDw. Adder 80
And a register 81 which takes in and holds the addition output data “GDi + GDm” of the adder 80 at the leading edge of the write clock pulse φ2, and the write command signal WR and the write clock pulse φ2 which output the synthesized tone data GDw output from the register 81. Gate 8 that passes and outputs only when 1 "
2 and the synthesized tone data GDw output from the gate 82 is supplied to the tone data memory 5 as write data.

9 is tone data GD read from the tone data memory 5.
This is a musical tone generating device in which m is converted into a corresponding analog musical tone signal by a DA converter 90, and the musical tone signal obtained thereby is generated from the sound system 91 as a musical tone. It should be noted that when the write command signal WR is "1", the musical tone generator 9 synthesizes the musical tone data GDm and the synthesized musical tone data GDw.
Are supplied in a time division manner in the read mode time and the write mode time, but the sound is prohibited unless a monitor is required.

The operation of the electronic musical instrument configured as described above will be described below.

First, the person who wants to store the waveform data corresponding to the external sound in the musical sound data memory 5 is the clear switch CL / SW.
Clear the tone data memory 5 by closing the
After that, when the write command switches W and SW are closed, the flip-flop 64 is set and "1" is output from its Q output.
The write command signal WR is output, and the tone data memory 5 enters the write standby state. Next, when a desired key is depressed on the keyboard, the key switch circuit 1 causes the key code KC and the key-on pulse KON representing the depressed key.
P is output, the latch circuit 2 latches the key code KC, and outputs the latched key code KC to the note clock generation circuit 3. As a result, the note clock generation circuit 3 causes the note clock signal 2 · NCK having a frequency twice the frequency corresponding to the supplied key code KC.
To the ½ frequency divider 73 and the flip-flop 61, and the ½ frequency divider 73 outputs the note clock signal 2 · NC
The note clock signal NCK obtained by dividing K by ½ is output to the AND gate 70. Since the AND gate 70 is supplied with the inverted write command signal of “0” via the inverter 69, the note clock signal NCK is output. The passage of NCK through AND gate 70 is blocked. On the other hand, the flip-flop 61 is also supplied with the note clock signal 2 · NCK
Is divided by 1/2 to output the read clock pulse φ1 and the write clock pulse φ2 (see FIGS. 2B and 2C) having the frequency corresponding to the key code KC. The order of closing the clear switches CL and SW, closing the write command switches W and SW, and pressing the keys on the keyboard is not limited to the order described above, but may be any order.

In this state, when an input musical tone is given to the microphone 40, the digital conversion circuit 4 outputs the digital musical tone data GDi corresponding to the level of the input musical tone, and
A trigger signal TRG having a short pulse width is output at the rising edge of the input musical tone. This trigger signal TRG is supplied to the counter 67 via the OR gate 65 of the memory control circuit 6, whereby the counter 67 stopped in the state showing the maximum count value is reset. Then, the address end signal of "0" output from the NAND gate 68 becomes "1" at this point. Therefore, the input condition of the AND gate 71 is satisfied, and the read clock pulse φ1 is output as the read clock signal RCK via the AND gate 71. The read clock signal RCK is then input as a count input to the counter 67 via the OR gate 66, whereby the count 67 outputs the address signal ADR which sequentially changes in the cycle of the read clock signal RCK.

On the other hand, the tone data memory 5 is supplied from the NAND gate 72 with a mode control signal MD which alternately becomes "1" and "0" in the same address signal time. Therefore, the tone data memory 5 is alternately in the read mode and the write mode in the same address signal time,
The tone data GDm read from the address designated by the address signal ADR during the read mode time is supplied to the adder circuit 8.
Since the musical tone data memory 5 is cleared by closing W, new musical tone data G from the digital conversion circuit 4 is generated.
Only Di is the adder 80, the register 81 and the gate circuit 8
2 is input to the musical tone data memory 5 via the write mode time 2 and is stored in the address designated by the address signal ADR. Such tone data GD
The write operation of i is similarly performed at other address signal times, but when the address signal ADR output from the counter 67 thereafter indicates the maximum value address,
An address end signal of "0" is output from the NAND gate 68, whereby the AND gate 71 is disabled and the stepping operation of the counter 67 is stopped. At the same time, a one-shot pulse EP is output from the one-shot circuit 63 by the address end signal of "0",
The one-shot pulse EP resets the flip-flop 64, and the write command signal WR output from its Q output changes from "1" to "0".

By the above operation, the musical tone data GD corresponding to the external sound input by the microphone 40 is stored in the musical tone data memory 5.
i is stored at the writing rate corresponding to the pitch frequency of the key pressed on the keyboard.

Next, the tone data GDm stored in the tone data memory 5
An operation for producing a musical sound corresponding to will be described.

In this case, first, when a key is pressed in the key switch circuit 1, the key switch circuit 1 outputs a key code KC corresponding to the pitch of the pressed key. At this time, the key switch circuit 1 outputs a key-on pulse KONP having a short pulse width at the start of transmission of the key code KC. The key-on pulse KONP is supplied to the AND gate 75 of the memory control circuit 6. At this time, since the inverted write command signal is "1", the gate 75 passes the key-on pulse KONP, and the pulse KONP is input as a reset signal to the counter 67 via the OR gate 65, whereby the counter 67 is Will be reset. Therefore, the address signal of "0" output from the NAND gate 68 becomes "1" at this point.

On the other hand, the key code K output from the key switch circuit 1
C is supplied to the note clock generation circuit 3 via the latch circuit 2. Then, the note clock generation circuit 3 outputs the note clock signal 2 · NCK having twice the frequency corresponding to the supplied key code KC (that is, the pressed key). The note clock signal 2 · NCK is divided by ½ by the ½ divider 73 and supplied to the AND gate 70 of the memory control circuit 6. At this time, other input signals of the AND gate 70 and Both are “1”. Therefore, the note clock signal NCK generated from the note clock generation circuit 3 and divided by 1/2 by the 1/2 divider 73 passes through the AND gate 70,
The count is input to the counter 67 via the OR gate 66. As a result, the counter 67 supplies the tone data memory 5 with the address signal ADR which sequentially changes in the cycle of the note clock signal NCK. Since the write command signal WR is "0" at this time, the AND circuit 71 blocks passage of the read clock pulse φ1 from the flip-flop 61.

In this state, the mode control signal MD supplied from the NAND gate 72 to the read / write control input terminal (R / W) of the tone data memory 5 is the write command signal WR of "0".
Therefore, it is "1". Therefore, the musical sound data memory 5 always holds the read mode state, and the stored contents of the address designated by the address signal ADR are sequentially read. The read stored contents, that is, the musical tone data GDm is supplied to the musical tone generating device 9 and is sounded as a corresponding musical tone.

In this way, the musical tone data GDm stored in the musical tone data memory 5 as described above is read at a reading rate (note clock signal NCK) corresponding to the pitch frequency of the key pressed by the keyboard. As a result, at the time of playing, if the same key as the key pressed at the time of writing the musical sound data GDi prior to the playing is pressed to read the musical sound data GDm, the reading rate of the musical sound data GDm and the musical sound data are set. Since the writing rate of GDi is the same note clock signal NCK corresponding to the key, that is, both are equal, in such a case, the external sound is reproduced as it is at its own frequency. On the other hand, when a key different from the key pressed at the time of writing the musical sound data GDi preceding the musical performance is pressed to read the musical sound data GDm during the performance, the reading rate of the musical sound data GDm is double-pressed. Since the writing rate of the musical sound data GDi deviates by an amount corresponding to the key pitch difference that is keyed, in such a case, the external sound is generated with the frequency changed corresponding to the key pitch difference.

As can be understood from the above description, according to the above-described embodiment, the key corresponding to the frequency of the external sound is set to the musical sound data GD.
If a key is pressed at the time of writing i, the frequency of the musical sound generated during the performance can be made to correspond to the pitch of the key, so that an external sound having an arbitrary frequency can be used as a sound source.

Next, a case will be described in which the write command switches W and SW are closed while the tone data GDm is already stored in the tone data memory 5. Also in such a case, as described above, the writing operation of the musical tone data GDi to the musical tone data memory 5 is started at the time when the input musical tone is given to the microphone 40, and the writing rate is set to the key pressed by the keyboard. It is defined by the corresponding note clock signal NCK. However, in such a case, the tone data GDm read from the address designated by the address signal ADR in the read mode time by the mode control signal MD which is alternately "1" and "0" in the same address time from the NAND gate 72 has previously generated a tone. The data GDm stored in the data memory 5 is added to new musical tone data GDi in the adder 80. Then, this addition data is input from the gate 82 via the register 81 to the musical tone data memory 5 as the synthesized musical tone data GDw during the write mode time in the same address signal time, and is read to the address designated by the address signal ADR. The synthesized tone data GDw is newly stored in place of the tone data GDm read during the mode time.

In this way, external sounds can be written in the musical sound data memory 5 in a duplicated manner. In such a case, if the keys to be pressed on the keyboard during writing are not changed and the microphone 40 is made to input sounds of different frequencies (musical instrument sounds) of the same frequency, the above-mentioned input to the tone data memory 5 is made. Musical tone data representing a musical tone having a mixed tone of the selected sounds is stored. Further, in this case, if the frequency of the sound (musical instrument sound) input to the microphone 40 is made different, or the writing rate for the two types of sounds is changed by changing the key to be pressed at the time of writing (the above-mentioned (Effective when the frequency of the input sound is fixed or its band is narrowly limited), and the overtone structure of the musical sound represented by the musical sound data stored in the musical sound data memory 5 is the two types of the inputted sound. It becomes complicated corresponding to.

Further, both of the two types of musical instrument sounds input to the microphone 40 may be matched with the key pitch high frequency, and the musical tone data GDi relating to the two types of musical instrument sounds may be overwritten and written in the musical tone data memory 5. For example, when reading out at the time of playing, it is possible to generate musical tones of a plurality of pitches at the same time by pressing a single key, and an effect such as a chord playing can be expected. That is, for example, instrument sounds of frequencies corresponding to the pitches C ₂ , E ₂ , G ₂ are sequentially input to the microphone 40, and all these sounds are pressed by the keys corresponding to the pitch C ₂ on the keyboard. While writing to the musical tone data memory 5 at a writing rate corresponding to the tone pitch C ₂ or sequentially inputting musical instrument tones having a frequency corresponding to the tone pitch G ₂ to the microphone 40, each of these tones C ₂ , D By pressing the keys corresponding to ₂ #, G ₂ respectively to the tone pitch data memory 5 at the writing rates corresponding to the pitches C ₂ , D ₂ #, G ₂ pitch C ₂ by key depression corresponding to the _{C 2, E 2, G 2} , to thereby generate a musical tone corresponding simultaneously. Since the frequency relationship of these musical tones is kept constant, various chords and the like are sounded according to the change of the designated pitch during performance. In such a case, if the same input musical instrument sound is used, a chord with a single musical instrument sound is obtained, and if different input musical instrument sounds are used, an effect like an ensemble performance is obtained.

In the above embodiment, the AND gate 70 has a 1 /
The note clock signal NCK from the frequency divider 73 is supplied. However, since the clock signal NCK and the read clock pulse φ1 from the flip-flop 61 are the same, the 1/2 frequency divider 73 is omitted. The read clock pulse φ1 may be guided to the AND gate 70. Further, according to this modification, the signals supplied to the AND gates 70 and 71 are different only in the write command signal WR and the inverted write command signal WR , so that one of the AND gate and the OR gate 66 is omitted. The AND logic output of the address end signal END and the read clock pulse φ1 may be directly supplied to the counter.

FIG. 3 is a block diagram showing another embodiment of an electronic musical instrument to which the musical tone signal generating method and apparatus according to the present invention is applied,
The electronic musical instrument shown in FIG. 1 is a read clock pulse φ1 obtained by dividing a clock pulse φ0 ′ having a very high frequency from a clock oscillator 60 ′ by a flip-flop 61.
And the point that the write clock pulse φ2 is formed, and the way the address signal ADR supplied to the tone data memory 5 is made is different, and the other parts have the same configuration.
That is, the musical tone data G stored in the musical tone data memory 5
When playing a tone corresponding to Dm, a frequency code R consisting of a decimal part and an integer part corresponding to the pressed key pitch is read from the frequency number memory 3'using the key code KC output from the latch circuit 2. This frequency number R is passed through the gate 73 to the fractional part accumulator 74a.
And an integer part accumulator 74b are supplied to the accumulator 74, where the accumulated value qR (q: 1,2,3 ...) Of the frequency number R is formed in the generation cycle of the read clock pulse φ1. The accumulated value q formed in this way
R is supplied to the tone data memory 5 as an address signal ADR. When the accumulated value qR indicates the maximum value, the carry output CA of the integer part accumulator 74b outputs the address end signal END, and the address end signal END sets the flip-flop 78 in the reset state. From the output of 78, the address end signal END 'of "0" is output. Then, this "0" address end signal END '
As a result, the gate 73, which has been in the on state until then, is turned off, and the accumulated value qR output from the accumulator 74 shows the maximum value and does not change thereafter.

The flip-flop 78 passes through the AND gate 75 which is turned on only when the inversion write command signal WR is "1" at the time of playing a musical tone corresponding to the musical tone data GDm stored in the musical tone data memory 5. Further, it is reset by the key-on pulse KONP passing through the OR gate 77.

Next, a case where the musical tone data GDi or the synthetic musical tone data GDw is written in the musical tone data memory 5 will be described. In this case, first, the write command switches W and SW are closed. This sets the flip-flop 64,
The write command signal WR of "1" is output from the Q output.

In this state, when an arbitrary key is depressed, the frequency number R corresponding to the tone pitch of the depressed key is read out from the frequency number memory 3 ', as in the case of the above-mentioned performance. And
When an input musical tone is given to the microphone 40 in this state, the digital conversion circuit 4 outputs the digital musical tone data GDi corresponding to the level of the input musical tone, and also outputs the trigger signal TRG at the rising time of the input musical tone.
Then, the trigger signal TRG passes through the AND gate 76, further passes through the OR gate 77, and is supplied as a reset signal for the flip-flop 78. As a result, the flip-flop 78 in the set state is reset and the address end signal EN output from its output is reset.
D'becomes a "1" signal. Then, the frequency number R, which has been prevented from passing through the gate 73 by the address end signal END ′ of “0”, passes through the gate 73 by the address end signal END ′ of “1” and is supplied to the accumulator 74. Then, the accumulated value qR is formed in the same manner as in the case of playing, and the accumulated value qR is given to the tone data memory 5 as the address signal ADR. When the accumulated value qR, that is, the address signal ADR shows the maximum value, the address end signal END is output from the accumulator 74, and the flip-flop 78 in the reset state is set by the address end signal END. The address end signal END 'outputted from the output of the above becomes a "0" signal. As a result, the frequency number R cannot pass through the gate 73, and the address signal ADR remains unchanged at the maximum value. Then, at the same address signal time indicated by the accumulated value qR which changes in this way, "1" is stored in the musical tone data memory 5.
A mode control signal MD alternately changing between "0" and "0" is applied from the NAND gate 72, whereby the synthesized tone data GDw or tone data GDi is stored in the tone data memory 5 as in the case of the embodiment of FIG. .

Therefore, also in the electronic musical instrument according to this embodiment, the address step of the tone data memory 5 corresponds to the pitch frequency of the key pressed on the keyboard, and the read and write rates of the memory 5 are the same as those of the above embodiment. Since the control is performed in the same manner as in the above case, it is possible to obtain the same effect as that of the above embodiment.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of an electronic musical instrument to which the musical tone signal generator according to the present invention is applied, FIG. 2 is a time chart for explaining the operation of the electronic musical instrument shown in FIG. 1, and FIG. FIG. 9 is a block diagram showing another embodiment of an electronic musical instrument to which the musical tone signal generator according to the present invention is applied. 1 ... Key switch circuit, 3 ... Note clock generation circuit,
3 '... frequency number memory, 4 ... digital conversion circuit,
5 ... tone data memory, 6 ... memory control circuit, 8 ... adding circuit, 9 ... tone generating device.

Claims (1)

[Claims] 1. A conversion means for inputting an external sound and converting the input external sound into digital waveform data, a memory for storing the waveform data, and the memory for storing the waveform data converted by the conversion means. And writing means for reading the waveform data stored in the memory at a reading rate corresponding to a specified pitch, and generating a tone signal based on the waveform data read from the memory. In the musical tone signal generator described above, the waveform data from the conversion means and the waveform data stored in the memory are combined and operated, the operation result is supplied to the memory, and the operation result is written by the writing means. And a writing rate setting means for variably setting the writing rate of the waveform data by the writing means. That musical tone signal generating apparatus.