JP2861007B2 - Electronic musical instrument - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

"Industrial application field" The present invention relates to an electronic musical instrument capable of imparting a slur (portamento) effect to generated musical sounds. "Conventional technology" Slur is a performance method in which when changing the pitch from one sound to the next, it does not change the pitch directly to the next sound, but changes the pitch smoothly and moves to the next sound. . In recent years, electronic musical instruments capable of imparting the slur effect have been developed (see Japanese Patent Publication No. 63-4191). In this electronic musical instrument, when a legato performance operation (a key operation in which the second keyboard key is operated before the first keyboard key is released) is performed in a state where the slur switch is on, A slur effect that automatically shifts from the sound of the first key to the sound of the second key while the pitch smoothly changes is automatically given. [Problem to be Solved by the Invention] By the way, the slur effect imparted to a conventional electronic musical instrument of this type usually has only a linear change in pitch, and in some cases, the pitch varies according to an exponential curve. However, this electronic musical instrument also had only one type of curve. Accordingly, an object of the present invention is to provide an electronic musical instrument capable of changing a slur curve (a change curve of a pitch, a volume, and the like during a slur) according to a pitch difference between a pre-slur sound and a post-slur sound. I have. [Means for Solving the Problems] A first invention is directed to an electronic musical instrument having performance information output means for outputting performance information and musical tone generating means for generating a tone signal based on the performance information. Storage means for storing information indicating a slur curve, slur instruction means for instructing a slur performance based on performance information output from the performance information output means, and when a slur performance is instructed by the slur instruction means. Pitch difference detecting means for detecting a pitch difference between a pre-slur sound and a post-slur sound,
When a slur performance is instructed by the slur instructing means, one of information indicating a plurality of slur curves stored in the storage means is stored based on the pitch difference detected by the pitch difference detecting means. And a means for sequentially changing the characteristic of the tone signal generated by the tone generating means from the sound before the slur to the sound after the slur based on the read information. Further, the second invention is characterized in that, in the first invention, a slur change curve (or straight line) is stored in advance in the storage means. According to the present invention, a plurality of pieces of information indicating slur curves each having a different shape are stored in advance, and the plurality of slur curves are displayed based on a pitch difference between a pre-slur sound and a post-slur sound during a slur performance. One of the information is selectively read, and the characteristic of the tone signal at the time of the slur performance is changed based on the read information. As a result, the shape of the slur curve itself can be changed in accordance with the pitch difference between the preceding and succeeding slurs, and the time change of the characteristics of the tone signal during the slur performance can be easily and variably controlled. Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

【overall structure】

FIG. 1 is a block diagram showing the overall configuration of an electronic musical instrument according to one embodiment of the present invention. In this figure, reference numeral 1 denotes a keyboard having a plurality of keys, and first and second key switches for detecting key operation are provided below each key.
Here, the first key switch is turned on when the key is slightly depressed, and the second key switch is turned on when the key has almost reached the lower limit position. Reference numeral 2 denotes a key press detection circuit, which sequentially scans the output of each key switch of the keyboard 1 every time a predetermined time elapses, checks the on / off state of each key, and detects an on key when it is turned on. The key-on signal KON is set to “1”, a narrow key-on pulse KONP is output, and a key code KC of the detected key is output. When the key is turned off, the key-on signal KON is returned to "0". Further, the key press detection circuit 2 includes a slur detection circuit 3a for detecting a key press operation (hereinafter, referred to as a slur operation) to which a slur effect is to be given, and a slur operation when the slur detection circuit 3a detects a slur operation. A slur pitch difference detection circuit 3b for detecting a pitch difference between the pre-slur sound and the post-slur sound is provided. When the slur detection circuit 3 detects a slur operation, it outputs a slur start signal SS (pulse signal). At this time, the slur pitch difference detection circuit 3b calculates the difference between the key code of the sound before the slur and the key code after the slur, and outputs the calculation result as the pitch difference data DD. The initial touch detection circuit 4 is a circuit for detecting an initial key press intensity (initial touch) of an operated key, and is a second key switch provided when the first key switch provided on the operated key is turned on. The time until the key switch is turned on is measured, and the measurement result is output as touch data TD. The tone color selection operator 5 is an operator for tone color setting provided on the operation panel. The timbre detection circuit 6 scans the output of each timbre selection operator 5 every time a fixed time elapses, detects the currently set timbre, and generates a timbre code NC indicating the timbre.
Is output. The slur effect circuit 9 is a circuit for imparting a slur effect to the generated musical sound. When the slur start signal SS is supplied, the slur effect circuit 9 outputs a key code KC that sequentially changes from a pre-slur sound to a post-slur sound. Also, the slur start signal
If SS is not supplied, the key code KC output from the key press detection circuit 2 is output as it is. Key code output from the slur effect circuit 9
The digital tone data GD having a tone of KC and a tone indicated by the tone color code NC output from the tone color detection circuit 6 is formed and output to the multiplier 11. Envelope generation circuit 12
Generates digital envelope data ED which changes in synchronization with the key-on signal KON and has a waveform determined according to the tone color code NC, and outputs the digital envelope data ED to the multiplier 11. The multiplier 11 multiplies the musical tone data GD by the envelope data ED, and outputs the multiplication result to the D / A converter 13. The D / A converter 13 converts the output of the multiplier 11 into an analog tone signal and outputs the signal to the sound system 14. The sound system 14 includes an amplifier, a speaker, and the like, and generates a tone signal output from the D / A converter 13 as a tone. Next, each part of the above-described electronic musical instrument will be described in detail.

[Slur Detection Circuit 3a] In this electronic musical instrument, as shown in FIG.
If the key of the second key is pressed before the key is released (０t ≧ 0), it is determined that the operation is a slur operation,
The slur start signal SS shown in FIG. Note that the overlap time Δt of the first key press and the second key press is
The slur operation may be determined only when 0 ≦ Δt ≦ Tx (where Tx is a fixed time). In addition, a slur instruction switch is separately provided, and when this switch is operated, a sound in which the envelope has not yet become zero at the first key-on thereafter is searched for, and when detected, a slur start signal SS is output. You may. In this case, a slur effect is applied from the detected sound to the sound of the first key-on. In addition, an overlap between the first and second key presses is detected, and
The slur start signal SS may be output when the envelope based on the key depression is not zero. Further, the slur start signal SS may be output when the above-mentioned overlapping time Δt satisfies 0 ≦ Δt ≦ Tx and the envelope is not 0.

[Envelope Generating Circuit 12] FIG. 3 is a block diagram showing the configuration of the envelope generating circuit 12, in which 18 is an envelope data generating unit. The envelope data generator 18 receives the key-on signal KON (see FIG. 4 (a)) output from the key press detection circuit 2 and generates, for example, envelope data EDa which changes with the waveform shown in FIG. 4 (b). Then, they are sequentially output at the timing of the clock pulse φe. In this envelope waveform, AT is a rising portion, ST is a sustaining portion, and DC is a damping portion. The envelope waveform differs for each timbre, and the peak value of the rising portion AT and the peak value of the sustaining portion ST are determined according to the touch data TD. Further, when the slur start signal SS is supplied, the envelope data generator changes the envelope waveform based on the first key press and the envelope waveform based on the second key press in accordance with the envelope waveform that is linearly maintained. Envelope data EDa is generated and output at the timing of clock pulse φe. That is, assuming now that FIGS. 5 (a) and 5 (b) are the first and second key depression timings, the slur start signal SS becomes as shown in FIG. 5 (c).
Occurs immediately after the second key press. Then, the slur timing at which the slur effect is applied becomes the timing shown in FIG. 11D, and the waveform of the envelope data EDa becomes the waveform shown in FIG. Here, as is apparent from FIG. 7E, when the slur start signal SS is supplied, the sustain portion ST of the envelope waveform based on the first key press and the sustain portion of the envelope waveform based on the second key press. ST is connected by a straight line. Therefore, the number of envelope data at the slur timing is SDN, and the level of the first sustained part is D.
1, if the level of the second sustaining part is D2 and (D2−D1) / SDN = d (1), after the slur start signal SS, the envelope data EDa is D1, D1 + d, D1 + 2d,. …, D1 + (SDN-1) d, D
It changes to 2 (see the broken line in FIG. 5 (e)). As described below, the data number SDN is equal to the read control circuit 19.
Supplied from Next, the slur envelope memory 20 is a memory in which n envelope waveforms (see FIG. 6) used in the above-described slur timing are stored. In other words, this electronic musical instrument does not use the dashed line portion of the envelope waveform of FIG. 5 (e) as it is during the slur performance, but inserts various shapes of envelope waveforms shown in FIG. 6 into the dashed line portion. Is available. In this case, which waveform is used depends on the tone code NC
And the pitch difference data DD. Each waveform is stored as data indicating a displacement from the 0 level. Therefore, this slur envelope memory
When the slur envelope waveform read from FIG. 20 (see FIG. 5 (f)) is added to the dashed line portion in FIG. 5 (e), as shown in FIG. The envelope waveform at the slur timing changes according to the waveform. The read control circuit 19 is a circuit for reading the envelope waveform in the slur envelope memory 20, and includes therein a waveform number table 22 shown in FIG. 7 and a head address table 23 shown in FIG. Waveform number table 22
Is a table in which the numbers of the slur envelope waveforms determined according to the upper 6 bits of the tone color code NC and the pitch difference data DD are stored in advance, and the upper 6 bits of the tone color code NC and the pitch difference data DD are used as address data. When supplied, the corresponding slur envelope waveform number is read. The start address table 23 stores the start address of the storage area of the memory 20 in which each slur envelope waveform is stored and the number of data SD constituting the envelope waveform.
This is a table in which N is stored. When an envelope waveform number is supplied as address data, a corresponding start address and data SDN are read. Thus, the read control circuit 19 always outputs "0". When the slur start signal SS is supplied, the timbre code NC supplied from the timbre detection circuit 6 and the pitch difference data DD supplied from the slur pitch difference detection circuit 3b at that time are stored in the waveform number table 22. To read the slur envelope waveform number, and supply the read waveform number to the start address table 23 to read the start address and data SDN. Then, it outputs the data SDN to the envelope data generator 18. Thereafter, the read control circuit 19 sequentially reads the slur envelope data from the slur envelope memory 20 based on the head address read from the table 23, and sequentially outputs the slur envelope data to the adder 21 at the timing of the clock pulse φe. The adder 21 adds the envelope data EDa output from the envelope data generator 18 and the output data of the read control circuit 19, and outputs the addition result as envelope data ED. That is, the adder 21 always outputs the data EDa as the envelope data ED, and when the slur start signal SS is generated, adds the data EDa to the slur envelope data output from the read control circuit 19 (the 5 (see (e) and (f)), and outputs the addition result as envelope data ED (see FIG. 5 (g)). The envelope generating circuit 12 stores various envelope waveforms in the slur envelope memory 20 and changes the envelope at the time of slur performance based on the waveforms. Different arithmetic expressions may be prepared, and these arithmetic expressions may be used one after another to calculate the envelope data.

[Slur Effect Circuit 9] FIG. 9 is a block diagram showing a configuration of the slur effect circuit 9. In the slur effect circuit 9 shown in this figure, the key code output from the key press detection circuit 2 in FIG.
KC is temporarily latched by the latch 30, and the latched key code KC is output to the tone generator 10 of FIG. 1 via the selector 31 and the hold circuit 32 in the through state. On the other hand, when the slur start signal SS is supplied, a curve stored in the slur curve memory 33 is read out, and a key code KC that changes sequentially according to a change curve of the read out curve is created. Key code
KC is sequentially output via the hold circuit 32. The details will be described below. (A) Configuration First, FIG. 10 is a diagram showing the slur curve memory 33 described above, and this memory 33 stores m different slur curves. Each slur curve is the eleventh
As shown in FIG. 2A, the first data Ds is "0", the last data De is "1", and the data Dx between them is 0 ≦ Dx ≦ 1. Also, the number of data CN
Is different for each curve. And each data is Ds → De
Are sequentially read out in this order. Reference numeral 34 in FIG. 9 denotes a memory reading circuit for reading data from the slur curve memory 33, which comprises a slur curve selecting circuit 35, an address generating circuit 36, and an adder 37. The slur curve selection circuit 35 includes therein a waveform number table 40 shown in FIG. 12 and a head address table 41 shown in FIG. The waveform number table 40 is a table in which the tone code NC and the number of the slur curve determined according to the upper 6 bits of the pitch difference data DD are stored in advance, and stores the upper 6 bits of the tone code NC and the pitch difference data DD. When supplied as address data, the corresponding slur curve number is read. The start address table 41 is
This is a table in which the start address of the storage area of the memory 33 in which each slur curve is stored and the number CN of data constituting the slur curve are stored.When the slur curve number is supplied as address data, the corresponding start address and data are stored. CN is read. When the slur start signal SS is supplied, the slur curve selection circuit 35 supplies the timbre code NC supplied from the timbre detection circuit 6 and the pitch supplied from the slur pitch difference detection circuit 3b at that time. The difference data DD is supplied to the waveform number table 40, the slur curve number is read, and the read number is supplied to the start address table 41 to start the address and data.
Read CN. Then, set the start address to the address data
It outputs to the adder 37 as SAD, and outputs the data CN to the address generation circuit 36. The address generation circuit 36 is a circuit for generating address data PAD which sequentially increases in the order of 0, 1, 2,..., And each data constituting the slur curve of the number determined by the slur curve selection circuit 35 is the address data PAD. Are sequentially read from the memory 33 based on The address data generation circuit 36 is configured to include an address counter, a gate circuit, a comparison circuit, and the like. When the memory read signal MRD (“1” signal) is supplied from the control circuit 39, the address counter is reset at the rising edge. Thereafter, the address counter counts up the slur clock φs, and the count output is the address data.
It is sequentially output to the adder 37 as PAD. The count output of the address counter is used as the slur curve selection circuit 35.
, The slur end signal SE is output to the control circuit 39. The control circuit 39 receives the slur end signal SE and returns the memory read signal MRD to “0”. As a result, the counting operation of the address counter stops. The adder 37 adds the start address SAD output from the slur curve selection circuit 35 and the address data PAD output from the address generation circuit 36, and outputs the addition result to the slur curve memory 33 as address data AD. Based on the address data AD, data in the slur curve memory 33 is sequentially read out and supplied to the interpolation circuit 44. The interpolation circuit 44 is, for example, a circuit that linearly interpolates between data output from the slur curve memory 33.
The data interpolated by 44 is sequentially output to the multiplier 45. A multiplier 45 is provided between the output data of the interpolation circuit 44 and the subtractor 46.
, And outputs the result of the multiplication to the adder 47. The adder 47 is provided with the output data of the multiplier 45 and the latch 48.
And outputs the result of the addition to the selector 31. The selector 31 selects and outputs the output of the adder 47 when the select signal SEL output from the control circuit 39 is "1" and the output of the latch 30 when the select signal SEL is "0". When the hold signal HLD is “0”, the hold circuit 32
It enters a through state, and stores and holds input data when it rises to “1”. The control circuit 39 is a circuit for generating a control signal for controlling each of the above components, and includes a key-on signal KON and a key-on pulse KON output from the key press detection circuit 2 in FIG.
Receiving P and the slur start signal SS, it generates the above-mentioned hold signal HLD, memory read signal MRD, and select signal SEL, and outputs them to each unit. FIG. 14 shows the timing of each of the above signals. (B) Operation Next, the operation of the above-described slur effect circuit 9 will be described. (B-1) When the slur start signal SS is not supplied In this case, the control circuit 39 outputs the select signal SEL
And outputs “0” to the selector 31. Thus, the output of the latch 30 is selected by the selector 31. In this state, the key-on signal KON rises, and when the key-on pulse KONP is supplied at the time of the rise, the control circuit 39 outputs the key-on pulse KONP to the latch 30 and outputs the hold signal HLD (“1” signal). Output to the hold circuit 32. Note that the pulse width of the hold signal HLD is about twice the pulse width of the key-on pulse KONP.
When the key-on pulse KONP is supplied to the latch 30, the latch
The key code KC is read into 30 and supplied to the hold circuit 32 via the selector 31. And the hold signal HLD
Returns to "0", the hold circuit 32 enters the through state, and the key code KC output from the latch 30 is output to the tone generator 10 (FIG. 1). (B-2) When the slur start signal SS is supplied The operation in this case will be described with reference to FIG. In addition,
In the following description, a key press detection circuit 2 based on a first key press
The key code KC output from the first key code KC1,
The key code based on the second key press is changed to the second key code KC2.
That. First, a key-on pulse KONP (symbol P1 in FIG. 14 (d)) based on the second key depression is supplied to the control circuit 39,
Also, at this time, when the slur start signal SS (figure (f)) is supplied at the same time, the control circuit 39 first outputs the key-on pulse KONP to the latches 30 and 48, and simultaneously holds the hold signal HLD (figure (f)). )) Is output to the hold circuit 32. When the key-on pulse KONP is supplied to the latch 48, the first key code KC1 supplied to the input terminal of the latch 48 at this point is read into the latch 48, and the key-on pulse KONP is supplied to the latch 30. Then, the second key code KC2 is read into the latch 30. Also,
When the hold signal HLD (“1”) is supplied to the hold circuit 32, the first key code KC1 is held in the hold circuit 32. Next, the control circuit 39 outputs a select signal (“1” signal) to the selector 31 at the fall of the slur start signal SS. As a result, the output of the adder 47 is subsequently selected by the selector 31. Next, the control circuit 39 returns the hold signal HLD to the “0” signal, and at the same time, the memory read signal MRD (“1” signal) ((g) in the same figure).
Is output to the address generation circuit 36. When the hold signal HLD becomes “0”, the hold circuit 32 enters a through state, and thereafter, the output of the adder 47 is switched to the selector 31 and the hold circuit 32.
Is output to the tone generator 10 via the. On the other hand, when the memory read signal MRD is supplied to the address generation circuit 36, the address data AD is successively output from the adder 37 and supplied to the slur curve memory 33. This allows
From the slur curve memory 33, slur curve data SCD corresponding to the tone color code NC and the touch data TD based on the second key press are sequentially output and supplied to the interpolation circuit 44, and the slur curve data SCDa interpolated from the interpolation circuit 44. Is a multiplier
It is sequentially output to 45. The multiplier 45 outputs the output data of the subtractor 46, that is, (KC
2-KC1) is multiplied by the slur curve data SCDa, and the result is output to the adder 47. The adder 47 is configured to output data of the multiplier 45 and the first key code KC1 output from the latch 48.
And outputs the addition result KC1 + (KC2-KC1) SCDa. Here, the data SCDa is data satisfying 0 ≦ SCDa ≦ 1, and therefore, the relationship of KC1 ≦ KC1 + (KC2−KC1) · SCDa ≦ KC2 holds. As a result, the data SCDa
When the waveform changes in accordance with the waveform of FIG. 11A, the output data of the adder 47 changes from KC1 to KC2 when KC1 <KC2, while the output data of the adder 47 changes when KC1 <KC2. The waveform changes in accordance with the waveform of FIG. 11B obtained by inverting the waveform of FIG. 11A with reference to “0.5”. And
The output data of the adder 47 is supplied to the tone generator 10 via the selector 31 and the hold circuit 32.
As a result, tone data GD whose tone pitch changes according to the slur curve in the slur curve memory 33 is formed in the tone generator 10, and this tone data GD is
In 11, the envelope data is multiplied by the envelope data ED output from the envelope generating circuit 12 described above, and the multiplication result is obtained.
The signal is converted into an analog signal by the D / A converter 13 and is generated by the sound system 14 as a musical tone to which a slur effect is added. The above is the operation of the slur effect circuit 9 shown in FIG. 9 during the normal performance. (C) Operation when Special Key Operation is Performed When Slur Operation is Performed Again by Performer During Automatic Slur Performance FIG. 15 is a timing chart of each signal of the slur effect circuit 9 in this case. In (c) of FIG.
The slur start signal SS indicated by P2 is a slur start signal SS based on the first slur operation, and a hold signal generated at the same timing as the slur start signal SS
At the falling edge of the HLD, the memory read signal MRD rises, and a slur automatic performance is performed. Then, before the memory read signal falls (during automatic slur play), if the slur operation is performed again by the player, the slur start signal SS indicated by the symbol P3 in FIG. 9 is supplied to the control circuit 39. The control circuit 39 receives the slur start signal SS and performs the same processing as described above, that is,
Perform processing to output the key-on pulse KONP to the latches 30 and 48 and the hold signal HLD to the hold circuit 32, respectively.
Next, the memory read signal MRD is set to “0”. Only the process of setting the memory read signal MRD to “0” is different from the normal slur process. Thereafter, the control circuit 39 sets the select signal SEL to “1” (in this case, it is already “1”) as in the case described above, and then the memory read signal MR
D is set to “1”. Thereafter, reading of the slur curve memory 33 is performed in exactly the same manner as described above, and
When the slur end signal SE is output from the address generation circuit 36, the slur process ends. FIG. 16 is a timing chart of each signal of the slur effect circuit 9 in this case when the second key is released during the automatic slur performance. Time t1 shown in FIG.
(E) through (g) even if the second key is released
As shown in the figure, there is no change in each signal. In this case, when the key-on signal KON becomes “0”, the envelope is gradually attenuated, but the slur performance is continued for the pitch. In the above case, the key is pressed again immediately after that. FIG. 17 is a timing chart in this case. Times of Day
After the second key release at t1, the slur end signal
At time t2 before the occurrence of SE, when the third key is pressed, a key-on pulse KONP is supplied to the control circuit 39, and at the rise of this key-on pulse KONP, the select signal SEL is returned to "0" ( Fig. 17 (e)
reference). Thereby, the selection state of the selector 31 is switched. In this case, since the slur start signal SS is not generated, a normal tone generation (irrelevant to the slur performance) is performed thereafter. Fig. 17 (f),
As is clear from (g), even after the selector 31 is switched, the memory read signal MRD is continuously output, and therefore, the count of the address counter in the address generation circuit 36 is determined by the generation of the slur end signal SE. Continue until you do. (D) Another Configuration Example Next, another configuration example of the above-described slur effect circuit 9 will be described. FIG. 18 is a block diagram showing the same configuration example. In this figure, the same components as those in FIG. 9 are denoted by the same reference numerals, and description thereof will be omitted. 9 is different from the circuit shown in FIG. 9 in the data in the slur curve memory 51 first. That is, the data in the slur curve memory 33 of FIG. 9 is, as shown in FIG.
The data changes from 0 to 1. In contrast,
The data in the slur curve memory 51 in FIG. 18 is data that changes from 1 to 0 as shown in FIG. In this case, data of Ds = 1 is read first,
Data satisfying ≦ Dx ≦ 1 is sequentially read, and finally data satisfying De = 0 is read. Next, the difference between the circuit in FIG. 18 and the circuit in FIG. 9 is the processing of data read from the interpolation circuit 44. That is, in the circuit of FIG. 18, the key code K32 output from the latch 30 is subtracted from the key code KC1 output from the latch 48 in the subtractor 52, and the subtraction result is output from the interpolation circuit 44. The result is multiplied by the slur curve data SCDa, and the result of the multiplication, that is, (KC1−KC2) · SCDa, is supplied to the adder 54 via the gate circuit 53. Here, the signal GS for controlling the opening and closing of the gate circuit 53 is a signal which becomes "1" at the same timing as the select signal SEL in FIG. 9. When this signal GS is "1", the gate circuit 53 is in the open state. Become. The adder 54 performs an operation of (KC1−KC2) · SCDa + KC2. And the result of this operation is the hold circuit
It is output as a key code KCS via 32. Thus, according to the above configuration, when KC1> KC2,
A slur automatic performance in which the pitch changes along the waveform (see FIG. 19) in the slur curve memory 51 is performed.
<In the case of KC2, the waveform in the slur curve memory 51 is set to "0.
A slur automatic performance in which the pitch changes according to a waveform inverted with reference to "5" is performed. In the above embodiment, the pitch of the slur is changed in accordance with the data in the slur curve memory 33 or 51. Instead, an arithmetic expression is selected based on the pitch difference data DD. The pitch may be changed by an arithmetic operation. Similarly, slur envelope memory
Instead of the envelope control based on the waveform in 20, one of a plurality of arithmetic expressions may be selected according to the pitch difference data DD, and the envelope control may be performed based on the selected arithmetic expression. Further, in the above embodiment, an error effect is given when a slur operation is detected by the slur detection circuit 3a. Instead, a slur on / off switch is provided on the panel surface, and the player sets this switch. When turned on, a slur effect may be provided. [Effects of the Invention] As described above, according to the present invention, information indicating a plurality of slur curves each having a different shape is stored in advance, and when a slur is performed, the pitch difference between the pre-slur and the post-slur is calculated. One of the plurality of pieces of information indicating the slur curve is selectively read out based on the information and the characteristic of the tone signal at the time of the slur performance is changed based on the read information. There is an effect that the time change can be variously and easily controlled.

[Brief description of the drawings]

FIG. 1 is a block diagram showing the configuration of one embodiment of the present invention,
FIG. 2 is a timing chart for explaining slur detection, FIG. 3 is a block diagram showing a configuration of the envelope generating circuit 12 in the embodiment, FIG. 4 is a waveform chart for explaining envelope data EDa, and FIG. FIG. 4 is a timing chart for explaining the operation of the envelope generating circuit 12 shown in FIG.
FIG. 6 is a diagram showing the contents stored in the slur envelope memory 20 in the envelope generation circuit 12, and FIGS. 7 and 8 are respectively a waveform number table 22 provided in the read control circuit 19 of the envelope generation circuit 12 and a head. FIG. 9 is a block diagram showing the configuration of the slur effect circuit 9 in the embodiment, FIG. 9 is a block diagram showing the contents of a slur curve memory 33 in the slur effect circuit 9, and FIG. B) is a diagram showing an example of a slur curve,
(B) shows a waveform obtained by inverting the slur curve shown in (a) with reference to "0.5". FIGS. 12 and 13 are provided in the slur curve selection circuit 35 of the slur effect circuit 9 respectively. FIG. 14 shows a waveform number table 40 and a start address table 41. FIG. 14 is a timing chart for explaining the operation of the slur effect circuit 9, and FIGS. 15 to 17 show cases where a special key operation is performed. FIG. 18 is a timing chart for explaining the operation of the slur effect circuit 9, FIG. 18 is a block diagram showing another configuration example of the slur effect circuit 9, and FIG. 19 is stored in the slur curve memory 51 in FIG. It is a figure showing an example of a slur curve. 3a: Slur detection circuit, 3b: Slur pitch difference detection circuit,
9: Slur effect circuit, 33: Slur curve memory, 34
…… Memory readout circuit, 45 …… Multiplier, 46 …… Subtractor, 47
... Adder.

Claims (2)

(57) [Claims] 1. Performance information output means for outputting performance information;
An electronic musical instrument having a musical tone generating means for generating a musical tone signal based on the performance information, wherein: a storage means for storing information indicating a plurality of slur curves each having a different shape; and the performance information output from the performance information output means. A slur instruction unit for instructing a slur performance based on the slur instruction; a pitch difference detection unit for detecting a pitch difference between a pre-slur sound and a post-slur sound when the slur instruction is instructed by the slur instruction unit; When a slur performance is instructed by the means, one of information indicating a plurality of slur curves stored in the storage means is read out based on the pitch difference detected by the pitch difference detection means, Means for sequentially changing a characteristic of a tone signal generated by the tone generating means from a sound before the slur to a sound after the slur based on the read information. Electronic musical instrument that. 2. Performance information output means for outputting performance information;
An electronic musical instrument having a musical tone generating means for generating a musical tone signal based on the performance information; a slur instruction means for instructing a slur performance based on performance information output from the performance output means; and a slur performance by the slur instruction means. And a pitch difference detecting means for detecting a pitch difference between a pre-slur sound and a post-slur sound when instructed, and a plurality of data sequentially changing from 0 to 1 or from 1 to 0 A storage unit storing a plurality of straight lines or curves each having a different shape; and a straight line or a curve corresponding to a pitch difference detected by the pitch difference detection unit when a slur performance is instructed by the slur instruction unit. From the storage means, and changes the characteristics of the tone signal generated by the tone generation means along the read straight line or curve from the pre-slur sound to the post-slur sound. An electronic musical instrument comprising: means for sequentially changing.