JPS6223872B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to an electronic musical instrument that generates a plurality of key-on signals for a bass tone and controls a plurality of musical tone sequences using the plurality of key-on signals. Generally, a keyboard for playing bass sounds (a first keyboard, for example, a pedal keyboard) of an electronic musical instrument is used as a single-note keyboard, and only a single key-on signal is generated in response to a key depression on the first keyboard. The first keyboard musical tone forming circuit is controlled in response to this single key-on signal, and a bass tone is formed. However, the bass sound based on a single key-on signal is inevitably monotonous, and it is not possible to obtain a favorable performance effect. This invention forms a plurality of key-on signals in response to a key press on the first keyboard or generation of key information indicating a bass tone based on an automatic bass performance function, and uses the plurality of key-on signals to activate a plurality of musical tone forming circuits. An object of the present invention is to provide an electronic musical instrument that can be controlled and thereby form a rich bass sound. In this invention, the first key-on signal and the second
A key-on signal is generated. The first key-on signal is transmitted to a musical tone forming circuit for the second keyboard (for example, a solo keyboard tone forming circuit) using key information indicating the bass tone.
It is used to drive. A musical tone forming circuit for a solo keyboard is generally constructed using a musical synthesizer system, and is capable of forming arbitrary tones. Therefore, driving the solo keyboard musical tone forming circuit with key information indicating the bass tone means that the timbre of the bass tone is greatly enriched. For example, by pressing the first key, a solo tone bass tone can be played, and when combined with an automatic bass performance function, an automatic bass tone can be played using a solo tone. The second key-on signal is used to control the tone forming circuit for the first keyboard. The musical tone forming circuit for the first keyboard is composed of a plurality of musical tone forming series forming base tones of a plurality of tones. In each series, depending on the tone to be formed, there are some that require a sustained key-on signal, and others that require an attack key-on signal. Therefore, in one embodiment of the present invention, the second key-on signal is composed of a plurality of sustain-type or attack-type key-on signals, and each series of the musical tone forming circuit is controlled by the plurality of key-on signals. I have to. DESCRIPTION OF THE PREFERRED EMBODIMENTS The electronic musical instrument of the present invention will be described in detail below with reference to an embodiment shown in the accompanying drawings. FIG. 1 is a block diagram showing an embodiment of an electronic musical instrument according to the present invention. In this embodiment, the channel processor 3 outputs the key information (key codes KB ₃ to _{KN 1} ) representing the pedal keyboard sounds output from the key coder 2 of the key assigner 100.
Three types of key-on signals KO ₁ , PKO ₁ , and PKO ₃ are generated from the key-on signal generating circuit 4 . These key-on signals are 1 and last normally (remains "1" as long as the key code indicating the pedal keyboard sound is output from key coder 2), and approximately 70 ms when playing an automatic bass chord.
A signal with a pulse width of (KO ₁ ). 2 It lasts normally, but when playing automatic bass chords, it lasts approximately
A signal with a pulse width of 30ms (PKO ₁ ). 3. A signal with a pulse width of approximately 30 ms (PKO ₃ ) at all times (both during normal performance and automatic bass chord performance). The key-on signal KO ₁ is used to drive the tone forming circuit 200 for the solo keyboard, and the key-on signals PKO ₁ and PKO ₃ are used to control the tone forming circuit 300 for the pedal keyboard. In FIG. 1, a key assigner 100 includes a key coder 2, a channel processor 3, and a data multiplexing circuit 5, and the key coder 2 mainly corresponds to keys pressed on the keyboard section 1 (upper keyboard, lower keyboard, pedal keyboard). The channel processor 3 mainly performs the operation of allocating this key code to the sound generation channel. To explain the operation of key coder 2 in more detail,
A bass for automatic bass chord performance is created by detecting a key pressed on the keyboard section 1, generating a key code representing the pressed key, and performing a predetermined operation on the key code representing the pressed key. The automatic bass chord performance key code generation operation can be roughly divided into two: key codes representing notes and automatic bass chord performance key code generating operations that generate key codes representing chord sounds. The pressed key key code generation operation will not be explained in detail, but the pressed key is detected by time-sharing scanning of the key switch corresponding to each key, and based on this detection, a 4-bit note code indicating the pressed key is generated.
KN ₁ to KN ₄ and 3-bit block code KB ₁
Generates a key code KC consisting of a total of 7 bits, KB ₃ . Tables 1 and 2 are the above note code KN _1
-KN4 and block codes _KB1 to _KB3 are shown.

【table】

【table】

[Table] The automatic bass chord performance key code generation operation is determined according to a function switch (not shown) operated by the function switch section 6. The function switch section 6 has a rhythm selection switch for selecting rhythms such as march, waltz, swing, ballad, slow rock, jazz rock, bolero, tango, begin, rumba, mambo, bossa nova, samba, etc., a single finger function, a finger chord function, The automatic bass chord function selection switch selects the automatic bass chord performance function such as the custom function, the automatic arpeggio function selection switch selects the automatic arpeggio performance function, and the up turn selection switch selects whether the automatic arpeggio performance is in up mode or turn mode, etc. It includes function switches, and signals indicating the operating status of each function switch are converted into serial data FD by a parallel-serial converter 7 and applied to the key coder 2 and pattern generator 8. The pattern generator 8 consists of, for example, a read-only memory (ROM), and generates bass patterns BT ₁ to BT ₄ for controlling automatic bass performance, arpeggio patterns AT ₁ to AT ₄ for controlling automatic arpeggio performance, and automatic chords. Automatic chord sounding patterns AC to AC for controlling the performance, accent signal ACC, slow rock selection signal SR, and ballad selection signal BL are generated according to each rhythm selection. Although not detailed in this specification, the accent signal ACC and slow lock selection signal
SR and ballad selection signal BL are used to control chord tones. Key coder 2 is parallel serial converter 7
Data FD indicating the operating status of the function switch sent from the pattern generator 8
A key code for automatic bass chord performance is formed and generated in accordance with the bass patterns BT ₁ to _{BT 4} generated from the base patterns BT 1 to BT 4 . When the single finger function, finger chord function, or custom function is selected as the automatic bass chord playing function, each automatic bass chord performance key chord formation operation is different, and the general operation in each case is as follows. . 1 When the single finger function is selected, the note of the single key pressed on the lower keyboard is taken as the chord root note, and multiple notes are played based on the chord type specified by a separate appropriate means (for example, chord type selection switch). A key code indicating the chord constituent notes is formed, and a key code indicating the bass note is formed based on the chord root note, chord type, and base patterns BT ₁ to BT ₄ . 2. When the finger chord function is selected, the key code indicating the key pressed on the lower keyboard is used as the key code indicating the chord constituent notes, and the chord type and chord root note are detected based on the key pressed on the lower keyboard, A key code indicating the bass tone is formed based on the chord type, the chord root note, and the bass patterns _BT1 to _BT4 . 3 When the custom function is selected, the key code indicating the key pressed on the lower keyboard is used as the key code indicating the chord constituent notes, and the chord type is detected based on the key pressed on the lower keyboard,
The tone of the key pressed on the pedal keyboard is taken as the chord root tone, and a key code indicating the bass tone is formed based on the chord type, the chord root tone, and the bass patterns BT ₁ to _{BT 4} . The key coder 2 outputs an upper keyboard signal U, a lower keyboard signal L, or a pedal keyboard signal P in synchronization with the generation of the key code indicating the pressed key and the key code for automatic bass chord performance. The upper keyboard signal U, lower keyboard signal L or pedal keyboard signal P is sent to the key coder 2.
This is a signal indicating that the key code generated from the key code is related to the upper keyboard sound, the lower keyboard sound, or the pedal keyboard sound.The channel processor 3 described below uses the upper keyboard signal U, lower keyboard signal L, and pedal keyboard signal Based on the key codes KB ₃ to _{KN 1} generated from the key coder 2, the pronunciation is assigned based on P. The key coder 2 also outputs arpeggio processing time signals ARP1 to ARP3 indicating the arpeggio processing time in the channel processor 3 and a key-off test signal X of a predetermined cycle used for key-off detection. The channel processor 3 assigns the key code generated from the key coder 2 to one of the sounding channels, forms a key code for automatic arpeggio performance based on the key code already assigned to the sounding channel, and performs the automatic arpeggio performance. Performs the operation of assigning a key code to a sound channel. Before explaining the operation of the channel processor 3, the sound generation channel in this embodiment will be explained. The electronic musical instrument of this embodiment has 18 time-divided sounding channels, and each sounding channel forms a musical tone indicated by a key code assigned to that channel. Of the 18 sound channels, the first channel is dedicated to pedal keyboard sounds, the second, fourth,
7 channels 5, 7, 10, 13, 16 are exclusively for upper keyboard sounds, 7 channels are 3rd, 6th, 8, 9, 11, 14, 17 are exclusively for lower keyboard sounds, 3 channels are 12th, 15th, 18th. is dedicated to automatic arpeggio sounds, and each key code for each keyboard sound and automatic arpeggio sound is assigned to one of the corresponding dedicated channels. Sound generation assignment of key codes in the channel processor 3 (key codes indicating the pressed keys generated from the key coder 2 or key codes for automatic bass chord performance and key codes for automatic arpeggio performance formed in the channel processor 3) The control must not yet be assigned to any of the dedicated channels to which that keycode corresponds. There must be an empty channel in the dedicated channel corresponding to that key code. This is done on the condition that Then, the key code assigned to each sound generation channel is output in a time-division manner in synchronization with the channel time. In this case, each channel time is indicated by a time slot of, for example, 1 μs. The details of this key code assignment control are not shown, but basically it is
This circuit is similar to the circuit described in detail in the specification of the invention No. 52-106417 titled "Electronic musical instrument." The key-on signal generating circuit 4 generates a plurality of types of key-on signals KO ₁ , KO ₂ , KO ₃ , PKO ₁ , PKO 3 for each sound channel in accordance with the assignment control for each sound channel in the channel processor ₃ . FIG. 2 shows an example of this key-on signal generating circuit 4. In FIG. In _the circuit below, _all shift registers, delay _flip - _{flops ,} etc. that are not marked with clock pulses _{φA .} Shift registers, delay flip-flops, etc. marked with _{a B} have a period
Shift registers, delay flip-flops, etc., which are driven by 18 μs two-phase clock pulses φ _A and φ _B and are marked with clock pulses φ _C . _D , have a period of 3.
It is driven by two-phase clock pulses φ _C and φ _D of μs. In FIG. 2, the key-on memory 41 consists of an 18-stage, 1-bit shift register, and stores in a time-divisional manner a signal indicating the on state or off state of the key related to the key code assigned to each sound generation channel. This key-on memory 41 performs the same function as the key-on memory described in the specification of the above-mentioned Japanese Patent Application No. 106417/1983, entitled "Electronic Musical Instrument." That is, key-on memory 4
1 stores the signal "1" in the same time slot as the sound generation channel by the signal LD at the same time as assigning the key code to the sound generation channel, and
It is configured such that when the release of the key is detected by the key-on test signal X, the memory thereof is cleared by the signal CL. A circuit consisting of an adder 42, AND circuits A1 to A4, and four 18-stage, 1-bit shift registers 43 to 46 time-divisionally converts the pulse signal applied to the carry input Ci of the adder 42 for each channel. It constitutes a 4-bit counter for counting. The output of the AND circuit A5 is applied to the carry input of the adder 42 via the AND circuit A6. AND circuit A5 has a signal T with a period of 3.5 ms and a pulse width of 54 μs, and a signal yk2 with a period of 54 μs and a pulse width of 18 μs shown in FIG. 5, which will be described later. outputs a pulse signal (time required for one cycle). A key code indicating the pressed key (or a key code for automatic bass chord performance or a key code for automatic arpeggio performance) is assigned to the current sound generation channel, and a signal "1" is sent to the key-on memory 41 at the channel time (time slot). is stored, the AND circuits A1 to A4 become operational during the channel time, and the circuit consisting of the adder 42, the AND circuits A1 to A4, and the shift registers 43 to 46 is applied to the carry input of the adder 42 at a period of 3.5 ms, pulse signals with a pulse width of 18 μs are counted. The key-on signal KO ₁ is obtained from the output of the key-on memory 41, and the key-on signals KO ₂ , KO ₃ , PKO ₁ ,
PKO ₃ is the adder 42, AND circuits A1 to A
4. Based on the count value of the counter consisting of shift registers 43 to 46, NOR circuit NR1 and NAND circuit
It is formed by a circuit consisting of NA1 to NA3 and AND circuits A7 to A11. Now, the outputs of the final stage (18th stage) of the shift registers 43 to 46 are respectively _C1 to _C4 , and the outputs of the 17th stage are _C1 ^* to _C4 ^* , respectively, and a NOR circuit _NR1 and a NAND circuit _NA1 Expressing the logical condition of ~NA ₃ as a formula,

[Table] − − −−
NA ₂ 〓C ₁ ^*・C ₂ ^*・C ₃ ^*・C ₄ ^*・ABC〓CON
...(3)

Claims (1)

[Scope of Claims] 1. Key-on signal generating means for generating a first key-on signal and a second key-on signal in accordance with key information indicating a bass sound generated based on a key press on a first keyboard or an automatic bass performance function; , a musical tone forming means for a first keyboard that forms a musical tone signal of a bass tone based on the key information indicating the bass tone and the second key-on signal; and a second keyboard that forms a musical tone signal based on a key pressed on the second keyboard. adding key information indicating the bass tone to the second keyboard musical tone forming means in response to the first key-on signal, and generating a musical tone signal corresponding to the bass tone in the second keyboard musical tone forming means; and means for forming a key-on signal, wherein one of the first key-on signal and the second key-on signal is a sustained key-on signal corresponding to a sustained tone that is at an active level while the key information is generated. , the other is an attack type key-on signal corresponding to a decaying sound that remains at an active level for a predetermined time from the generation of key information, and the bass sound is generated as a combination of a decaying sound and a sustained sound. musical instrument. 2. A patent in which the musical tone forming means for the first keyboard has a plurality of musical tone forming sequences, the second key-on signal consists of a plurality of key-on signals, and each of the musical tone forming sequences is controlled separately by each key-on signal. An electronic musical instrument according to claim 1. 3. The electronic musical instrument according to claim 1 or 2, wherein the first keyboard is a pedal keyboard and the second keyboard is a solo keyboard.