JP2763535B2 - Electronic musical instrument - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an electronic musical instrument for generating various musical sounds. 2. Description of the Related Art In recent years, digital technology has been used for electronic musical instruments, and operability and sound quality have been remarkably improved. As for the operability, there is a key assigner technique for controlling a tone synthesizer in response to an output instruction (for example, a key press on a keyboard) (for example, US Pat. No. 3,610,792). There is a tone synthesis technique for reproducing a complex waveform change of a tone by controlling a plurality of sounding channels to synthesize one tone (for example, Japanese Patent Publication No. 57-31156). Hereinafter, the key assigner and the tone synthesizer described above will be described with reference to the drawings. FIG. 2 shows the configuration of a conventional key assigner. In FIG. 2, 101 is an assignment control unit, 102 is an assignment memory, and 103 is a pointer register. The operation of the key assigner configured as described above will be described below. Assignment control unit 101 connected to M tone synthesizers
Controls the tone synthesizer in accordance with information on on / off, pitch, timbre, volume or the like of a tone input from an input device such as a keyboard. Here, it is assumed that the contents of the pointer register 103 indicate the first block of the assignment memory 102 composed of M blocks in the initial state. It is also assumed that the first to M-th blocks of the assignment memory 102 have been initialized to contents indicating an OFF state. When the content of the musical tone output instruction input is on, the assignment control unit 101 reads the content of the pointer register 103,
The contents of the pointer register 103 are incremented by one block. When the content of the i-th block of the assignment memory 102 corresponding to the content of the read pointer register 103 is off, the assignment control unit 101 outputs the tone information to the i-th tone synthesizer and simultaneously assigns the assignment memory 102
Of the i-th block is rewritten to indicate ON.
When the content of the i-th block is ON, the assignment control unit 101 outputs an instruction for forcibly terminating sounding (called a first dump) to the i-th musical tone synthesizer, and then performs a sounding ending process. Is received from the i-th tone synthesizer, the tone information is output to the i-th tone synthesizer, and the contents of the i-th block of the assign memory 102 are rewritten to indicate ON. In the above, when the assignment control unit 101 rewrites the contents of the i-th block of the assignment memory 102,
It is assumed that the tone information is rewritten in addition to the on / off. When the result of incrementing the contents of the pointer register 103 indicates the (M + 1) th block, the pointer is reset to indicate the first block. On the other hand, when the content of the tone output instruction input is off, the assignment control unit 101 searches the content of the assign memory 102, and when the same tone information detects the j-th block indicating on, the j-th tone synthesizer. , And outputs the instruction of the end of sounding, and rewrites the content of the j-th block of the assignment memory 102 to the content indicating OFF. With the above operation, the tone generation of the number M of tone synthesizers smaller than the number of musical tones (for example, the number of keys of the keyboard) that can be output is sequentially controlled based on the output instruction within the range of the number M of simultaneous sounds. Become. FIG. 3 shows the configuration of a conventional tone synthesizer. In FIG. 3, 110 is a synthesis control unit, 111 and 112 are first and second waveform generators, 113 and 114 are first and second envelope generators, 115 and 116 are first and second multipliers, and 117 is an adder. , 118 are synthesis parameter memories, and 119 is a sounding channel. The operation of the tone synthesizer configured as described above will be described below. The synthesis control unit 110 reads from the synthesis parameter memory 118 synthesis information corresponding to musical tone information input such as pitch, timbre, volume, on, and off, and generates waveform generators 111 and 112 and an envelope generator in accordance with the read synthesis information. A synthesized sound is output by controlling 113 and 114. That is, when the tone information is on, the synthesis control unit 110 sets the synthesis parameter memory 11 based on the pitch, timbre, and volume information.
8 and reads the corresponding combined information, and according to the combined information, the first and second waveform generators.
It outputs data indicating the waveform type and cycle to be output to 111 and 112, and outputs data indicating the envelope to be output to the first and second envelope generators 113 and 114. The first and second waveform generators 111 and 112 repeatedly output a desired waveform at a desired cycle in accordance with data input from the synthesis control unit 110 and indicating a waveform type and a cycle to be output. On the other hand, the first and second envelope generators 113 and 11
Reference numeral 4 outputs a desired envelope according to data input from the synthesis control unit 110 and indicating an envelope to be output. The waveforms output from the first and second waveform generators 111 and 112 and the envelopes output from the first and second envelope generators 113 and 114 respectively correspond to first and second multipliers.
After being multiplied in 115 and 116, they are added in an adder 117. By the above operation, the first time varying independently of each other is performed.
And the output waveforms of the second multipliers 115 and 116 are combined and output by the adder 117 as one complex sound waveform having a time variation. Note that the above-described tone synthesizer has two systems, namely, a first system and a second system, that is, two sound channels.
There is also a tone synthesizer consisting of a number of sounding channels. Problems to be Solved by the Invention However, in the above configuration, when the maximum number of simultaneous sounds is M, that is, when the number of synthesizers is M, each tone synthesizer may have N sound channels. For example, MN sound channels must be prepared. In other words, there is a problem that a large number of MN sounding channels must be prepared in either case of increasing the maximum number M of sounds or improving sound quality. SUMMARY OF THE INVENTION In view of the above problems, the present invention provides an electronic musical instrument capable of freely controlling the number of simultaneous sounds and the sound quality with the aim of efficiently using a finite number of sound channels with a simple configuration. Things. Means for Solving the Problem In order to achieve this object, an electronic musical instrument according to the present invention is provided with a control unit that receives tone generation mode information and tone information indicating the use of an output tone, such as for playing a hand or for automatic accompaniment. And M tone generation channels for starting and stopping a tone according to a control signal output from the control unit, and referencing when the control unit outputs a control signal for generating a tone according to input information. For this purpose, a synthesis parameter memory for storing synthesis information including the number N (1 ≦ N ≦ M) of sounding channels to be simultaneously generated for one musical tone generation, and the output signals of the M sounding channels are added and synthesized. The number N of tone generation channels stored in the synthesis parameter memory is stored with different values depending on the tone generation mode information. In accordance with N referred to from the synthesis parameter memory according to the difference in tone generation mode information, a different number of sounding channels are instructed to start sounding, and the output signals of the N sounding channels sounded by the sounding instruction are output. The signals are added and combined by the adder and output. Act by this configuration, the control unit in response to the generation mode information of the musical tone information is input and tone, the composite information including data relating to the sound channel number L _i to be used for the synthesis read from the synthesis parameter memory, and the pointer register writing is being pronunciation against assignment memory instructs pronunciation against L _i number of assignable channels starting from indicated by the tone generation channel. The control unit reads from the assignment memory whether or not the sounding channel is being sounded before instructing each sounding channel to sound on. If the sounding channel is sounding, the control unit turns off the sounding channel and then sounds the sound. Instructions. By the above-described operation, each musical tone is synthesized by the musical tone information and the number of tone generation channels corresponding to the number of tone generation channels to be used for the tone to be written in advance in the synthesis parameter memory for each tone generation mode information. Embodiments Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing an electronic musical instrument according to an embodiment of the present invention. In FIG. 1, 1 is a control unit, 2 is a synthesis parameter memory, 3 is an assignment memory, 4 is a sound channel group, 5
Is an adder, 6 is a pointer register, and 10 to 12 are first to M-th sounding channels, respectively. The operation of the electronic musical instrument configured as described above will be described below. First, when tone information such as timbre, pitch, volume, etc. relating to a tone to be output and generation mode information of the tone to be output are input to the control unit 1, the control unit 1 sends the tone information from the synthesis parameter memory 2. Then, the synthesis information corresponding to the tone generation mode information is read. Note that the tone generation mode information referred to here is, for example, for an electronic organ, mainly for solo presets for playing a melody, for poly presets used for ordinary two-handed performance, for a company used for automatic accompaniment, etc. This indicates the form of tone generation according to the type of performance.In general, even for the same instrument sound, a tone for a solo preset that takes a melody expresses a finer expression than a tone for a poly preset. On the contrary, the musical tone for the accompaniment is often output together with the rhythm sound as the backing performance, so that it does not require much fine expression. The synthesis information stored in the synthesis parameter memory 2 in advance has, for example, the contents shown in Table 1. That is, from the tone information and the tone generation mode information, it is possible to obtain synthetic information such as the number of sound channels constituting the tone to be output, the waveform to be generated in each channel, and the envelope. Note that the sounding channel referred to here is equivalent to the sounding channel shown in the conventional example. In the conventional example, the sounding channel is composed of a waveform generator, a multiplier, and an envelope generator. This means that M sound channels can be generated simultaneously. As a method for realizing such a plurality of sounding channels, a method for realizing time division multiplexing and the like already exist as known techniques. Next, the control unit 1 determines whether or not the sound channel indicated by the pointer register 6 and the subsequent sound channel L _i sound channels are sounding, that is, whether the sound channels are on or off. The determination is made by reading, and an instruction for forcibly terminating the on sound channel is output to the sound channel group 4. When the pointer register 6 sound channels and subsequent total L _i number of sound channels are all turned off shown, the control unit 1 is the L _i number of relative sound channel, sound information and the sound read from the synthesis parameter memory 2 outputs the higher of the information, and writes the data indicating that L _i number of sound channels are on for assignment memory 3. When the tone information for stopping the tone being output is input, the control unit 1 performs the same operation as the conventional one. The pointer register 6 operates in the same manner as in the related art, but the value to be incremented is not a fixed value as in the related art. That is, the incremented value by L _i is stored in the control unit 1. However, the incremented value is M
In the case of exceeding, the remainder value regarding M is set. A sounding channel group 4 including M sounding channels 10 to 12 operates in the same manner as in the related art. The sounding waveforms output from the M sounding channels 10 to 12 by the above operation are added by the adder 5 and output as musical sound data. As described above, according to the present embodiment, the tone corresponding to the tone, the pitch, the volume, and the like relating to the tone to be output, and the tone generation mode information indicating the tone generation mode corresponding to the type of performance. Is stored in the synthesis parameter memory, so that it is necessary to perform musical synthesis at that level according to the level of sound quality required for performance. An electronic musical instrument that outputs musical tones while appropriately changing the number of sounding channels can be realized. As an example, if a musical tone of a piano is synthesized by two sounding channels (for example, stereo) and a constant sound quality level is maintained, the number of simultaneous sounds of the musical sound is 1/2 of the number of simultaneous sounding channels. However, when the tone is composed of a single tone channel in order to increase the number of simultaneous tones of the tone, the tone quality level of a normal performance may not be reached. Therefore, when this musical tone is used for automatic accompaniment, it is possible to increase the number of simultaneous tones while maintaining the tone quality level during normal performance by using a single tone generation channel. In this case, the piano used for the automatic accompaniment is inferior in sound quality to the piano of the ordinary performance, but is often appropriate in view of its importance and effect. As described above, the present invention is extremely effective for improving the number of simultaneous sounds of musical tones without deteriorating the quality of musical tones in a normal performance on a limited number of sounding channels. In this embodiment, L _i number of tone generation channels to instruct the sound is, although a total of L _i number of tone generation channels and subsequent sound channel indicated by the pointer register 6, but not limited thereto, L _i number of The method of securing channels includes, for example, giving priority to an off sounding channel, changing the priority according to the progress of attenuation, and the like.
Various methods are conceivable. Accordingly, in the present embodiment, when the value of the pointer register 6 is incremented by L _i exceeds M, the residue value of M, has become, but the channel on, off state, progress of decay For example, it is not always necessary to set the remainder value of M. Advantageous Effects of the Invention The present invention stores tone information to be output and tone synthesis information corresponding to tone generation mode information in a synthesis parameter memory, thereby appropriately changing the number of sound channels required for tone synthesis. The tone output is performed while the tone is being played, so that the sound quality required for the performance can be obtained as appropriate.With a limited number of sound channels, the number of simultaneous sounds of the tone can be greatly improved without lowering the tone quality during normal performance. Can be done.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram of an electronic musical instrument according to an embodiment of the present invention, and FIGS. 2 and 3 are block diagrams of a conventional electronic musical instrument. 1 ... Control unit, 2 ... Synthesis parameter memory, 3 ... Assign memory, 4 ... Sound channel group, 5 ... Adder, 6 ... Pointer register, 10 ... First sound channel, 11 ... Second sounding channel, 12... Mth sounding channel.

Claims (1)

(57) [Claims] A control unit that receives tone generation mode information and tone information indicating the use of the output tone, such as for playing or automatic accompaniment, and M for starting and stopping the tone according to a control signal output from the control unit The number of sounding channels N (1 ≦ N ≦ 1) that are simultaneously generated for one musical sound generation, for reference when the control unit outputs a control signal for generating a musical sound according to the input information. M)
A synthesis parameter memory for storing synthesis information including: and an adder for adding and synthesizing the output signals of the M sound channels and outputting the result. The number N of sound channels stored in the synthesis parameter memory is: Different values are stored depending on the tone generation mode information, and the control unit determines, for one tone generation, different numbers of sounding channels in accordance with N referred from the synthesis parameter memory depending on the difference in tone generation mode information. An electronic musical instrument for instructing the start of sounding, wherein the output signals of the N sounding channels sounded by the sounding instruction are added and synthesized by the adder and output.