JPS59162595A - Musical tone sythesizer - Google Patents

Abstract

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

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a musical tone synthesis device using a so-called phoneme segment editing and synthesis method, and can be used in electronic musical instruments that require sounds similar to the original instrument.

Structure of conventional examples and their problems In general, phoneme segment editing synthesis methods extract representative phoneme data in pitch units from the original musical tone signal based on strong similarities between adjacent waveforms of musical tones. The phoneme piece data is edited and a desired musical tone signal is synthesized by sequentially connecting the phoneme piece data while repeating it a plurality of times according to musical tone synthesis control information. In addition, in this method, the waveform and pitch period of phonemes change rapidly at the connection points of different phonemes, resulting in periodic noise due to the repetition of phonemes, making it difficult to obtain a smooth musical tone signal. In order to solve this problem, attempts have been made to insert an interpolated phoneme segment obtained by interpolation calculation between two phoneme pieces. That is, two phoneme pieces A to be interpolated in a phoneme piece interpolation method that is compatible with the conventional phoneme piece editing and synthesis method.

The 1st waveform Ck of the interpolated waveform C that is interpolated once during 8 intervals is expressed as the following equation (1).

i=1.2. ......, N k = 1.2. ......, j However, each phoneme consists of N pieces of piece data, and each piece of phoneme data is assumed to be A,, B,, Ck.

However, in such a phoneme segment interpolation method, all operations including addition, subtraction, multiplication, and division are required in order to calculate the interpolated phoneme segment Cki, so there is a problem in that the time load on the musical tone synthesis device becomes large.

OBJECTS OF THE INVENTION The present invention is intended to solve the above-mentioned conventional drawbacks, and it is an object of the present invention to provide a musical tone synthesis device for an electronic musical instrument that has a simple configuration and is more faithful to the original instrument sound. .

Structure of the Invention The present invention is configured such that a part of the first term on the right side of the above equation (1) is stored in the memory as differential phoneme data.0 According to this structure, the following equation (2) is obtained. As shown in FIG. .

Cki=Gi+C(k-1)i... (
2) However, Co1=Ait=1 2 ...... Nk=1.2
．． . . . (j+1) Description of Embodiment Hereinafter, an embodiment of the musical tone synthesis device of the present invention will be described. The figure shows an embodiment of the present invention, in which a control section 1 to which a musical tone output instruction signal is input reads synthesis information corresponding to a musical tone to be output from a synthesis information memory section 2. If the read synthesis information includes information that an addition operation is not required, the phoneme group or phoneme piece data corresponding to the read synthesis information is read from the phoneme memory section 3 and digitally stored directly in the temporary storage section 6. Output as a musical sound waveform. If the read synthesis information includes information that requires an addition operation, the phoneme memory unit 3 collects N difference phoneme data corresponding to the read synthesis information (hereinafter referred to as phoneme pieces that require an addition operation). Alternatively, all differential phoneme pieces are assumed to consist of a predetermined N pieces of data), and the differential phoneme data and the eight digital tone waveforms written in the temporary storage unit 6 that were output immediately before are read again. After performing addition N times in correspondence with the waveform data, it is output to the temporary storage section 6 as a digital tone waveform. After repeating the above operation a number of times corresponding to the read composite information, the next composite information memory is read and the same process is continued until an output stop instruction signal is input to the control section 1. On the other hand, it outputs a function of inputting an output instruction signal to the control section 1, generating a constant timing signal regarding the corresponding output cycle, and outputting this to the temporary storage section 6 as a digital musical sound waveform output cycle instruction signal. The period generator 4 executes this.

Next, the characteristic content of the present invention in this embodiment will be explained.

According to this embodiment, the number of repetitions of phoneme segments or differential phoneme segments directly contributes to the compression ratio. In other words, if the number of repetitions is 4 on average, a compression ratio of 4 can be obtained. .

By increasing the number of comb repetitions, it is possible to greatly compress data regarding a considerable number of types of tone waveforms. On the other hand, if a musical tone is characterized by pitch fluctuations in the transitional part of the musical tone, it is possible to store the characteristic part as a group of long-period phonemes in the phoneme memory section, and then read it out using a fixed timing signal to change the pitch. can also be expressed.

Effects of the Invention As described above, according to the present invention, it is possible to synthesize either periodic or aperiodic musical tones, and since the calculation load on the control section is extremely small, a system configuration using a general-purpose microcomputer is also possible. In addition, it is possible to easily configure a musical tone synthesizer that obtains high-quality musical tones.

[Brief explanation of the drawing]

The figure is a block diagram showing one embodiment of the present invention. DESCRIPTION OF SYMBOLS 1... Control section, 2... Synthesis information memory section, 3... Phoneme memory section, 4... Output cycle generation section, 6... ...Temporary storage.

Claims (1)

[Claims] A phoneme memory unit stores phoneme group or phoneme piece data related to digital musical sound waveforms, a synthesis information memory unit stores information regarding synthesis, and reads from the synthesis information memory unit corresponding to the musical tone to be output, and corresponds to the synthesis information. The phoneme group or phoneme piece data to be sequentially read from the phoneme memory section and the addition operation result of the phoneme group or phoneme piece data as is or with the phoneme piece data in the temporary storage section that was output immediately before corresponding to the phoneme group data. a control unit that stores the digital musical tone signal in a temporary storage unit as a digital musical tone signal; an output cycle generating unit that instructs the temporary storage unit to read out the digital musical tone signal corresponding to the musical tone to be output; a temporary storage unit that sequentially stores the digital musical tone signals and sequentially outputs the digital musical tone signals at timings instructed by the output cycle generating unit, and performs an addition operation in the control unit as the synthesis information. Regarding the corresponding phoneme segment in which this information is also stored and the addition operation is to be performed, a phoneme segment consisting of a predetermined constant number N of phoneme segment data or a difference phoneme segment for the N addition operation is used. A musical tone synthesis device 0 characterized in that the phoneme memory unit stores