GB1286128A - Signal processing arrangement for an electronic musical instrument - Google Patents
Signal processing arrangement for an electronic musical instrumentInfo
- Publication number
- GB1286128A GB1286128A GB5034869A GB5034869A GB1286128A GB 1286128 A GB1286128 A GB 1286128A GB 5034869 A GB5034869 A GB 5034869A GB 5034869 A GB5034869 A GB 5034869A GB 1286128 A GB1286128 A GB 1286128A
- Authority
- GB
- United Kingdom
- Prior art keywords
- frequency
- tone
- exact
- frequencies
- shifters
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10H—ELECTROPHONIC MUSICAL INSTRUMENTS; INSTRUMENTS IN WHICH THE TONES ARE GENERATED BY ELECTROMECHANICAL MEANS OR ELECTRONIC GENERATORS, OR IN WHICH THE TONES ARE SYNTHESISED FROM A DATA STORE
- G10H1/00—Details of electrophonic musical instruments
- G10H1/02—Means for controlling the tone frequencies, e.g. attack or decay; Means for producing special musical effects, e.g. vibratos or glissandos
- G10H1/06—Circuits for establishing the harmonic content of tones, or other arrangements for changing the tone colour
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10H—ELECTROPHONIC MUSICAL INSTRUMENTS; INSTRUMENTS IN WHICH THE TONES ARE GENERATED BY ELECTROMECHANICAL MEANS OR ELECTRONIC GENERATORS, OR IN WHICH THE TONES ARE SYNTHESISED FROM A DATA STORE
- G10H1/00—Details of electrophonic musical instruments
- G10H1/02—Means for controlling the tone frequencies, e.g. attack or decay; Means for producing special musical effects, e.g. vibratos or glissandos
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Multimedia (AREA)
- Electrophonic Musical Instruments (AREA)
Abstract
1286128 Electrophonic musical instruments MATSUSHITA ELECTRIC INDUSTRIAL CO Ltd 14 Oct 1969 [21 Oct 1968] 50348/69 Heading G5J A tone generator 101 generates a tone consisting of a fundamental together with a series of exact harmonies, and the output is fed to a frequency shifter 201 which moves all the frequencies up or down by a given amount ## which is preferably a sub-audio frequency so that the inharmonicity function Y (n) = fn/nf1, where fn is the frequency of the n'th partial and f 1 is the frequency of the fundamental, which is equal to unity for all n for an exact sequence of partials becomes:- The muscial interest of the sound is thus enhanced and in the former case, it is possible to match the inharmonicities of conventional instruments, e.g. the piano, as in Fig. 3 (not shown). A number of tone generators and frequency shifters can be combined, together with a keyboard switching system and a tone filter to form a musical instrument, the sequences of exact harmonics generated by derives 101 . . . 104 . . . &c. preferably being biased so that the output frequencies are those of a musical scale. The quantities ## for each output tone may be constant or variable. In the case of a single tone generator of different exact harmonic frequency sequences, the shifting frequency may be dependent on the frequency sequence, Fig. 4 (not shown). In Fig. 6 (not shown) the tones are grouped and fed through a lesser number of frequency shifters, and in Figs. 7, 9 and 10 (not shown), the tone frequencies are added and filtered into frequency bands which are separately shifted. In Fig. 10 (not shown) there are four frequency bands, the lowest being shifted downwards, and the upper two shifted upwards, the remaining band being unchanged, Fig. 11 (not shown). This system provides octaves at the extremes of the frequency range which are wider, and more pleasing to the ear than the exact 2:1 ratio of the tone generator, Fig. 8 (not shown). The system of Fig. 10 (not shown), uses generators providing 12 semitones within an octave, with frequency dividers to provide a set of tones with exact harmonics for the filters and frequency shifters. The tone generators may be replaced by an input consisting of the sounds of conventional musical instruments, or other sound sources, whose tonal properties are thus modified. Means to produce the frequency shift may be an oscillator of frequency ## producing two signals in quadrature, together with a phase-shifter producing two signals of frequency f in quadrature from a single input of frequency f, and these when multiplied will give frequencies #Œ##, Fig. 12 (not shown). The multiplying means may consist of an amplitude modulator, modulating a frequency f with the frequency ##, and a phase inverter to remove the carrier leaving sidebands at #Œ##, Fig. 13 (not shown). Alternatively the frequency fa, Fig. 41 (not shown), may be respectively modulated with frequency cf with subsequent filtering out of the lower side band, modulating the resulting frequency with a frequency fc<SP>1</SP> and filtering the result to give a frequency #α-##, where ## = #c-#c<SP>1</SP> Fig. 15 (not shown).
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP43077565A JPS4911934B1 (en) | 1968-10-21 | 1968-10-21 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1286128A true GB1286128A (en) | 1972-08-23 |
Family
ID=13637520
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB5034869A Expired GB1286128A (en) | 1968-10-21 | 1969-10-14 | Signal processing arrangement for an electronic musical instrument |
Country Status (5)
Country | Link |
---|---|
JP (1) | JPS4911934B1 (en) |
DE (1) | DE1953503C3 (en) |
FR (1) | FR2021150A1 (en) |
GB (1) | GB1286128A (en) |
NL (1) | NL149931B (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2261553C2 (en) * | 1971-12-29 | 1982-09-02 | Nippon Gakki Seizo K.K., Hamamatsu, Shizuoka | Electronic musical instrument - with keyboard, tone generators and frequency dividers and has latching selectors coupled to keyboard via gating circuit |
US3888153A (en) * | 1973-06-28 | 1975-06-10 | Nippon Gakki Seiko Kk | Anharmonic overtone generation in a computor organ |
JPS5297722A (en) | 1976-02-12 | 1977-08-16 | Nippon Gakki Seizo Kk | Electronic musical instrument |
-
1968
- 1968-10-21 JP JP43077565A patent/JPS4911934B1/ja active Pending
-
1969
- 1969-10-14 GB GB5034869A patent/GB1286128A/en not_active Expired
- 1969-10-20 FR FR6935897A patent/FR2021150A1/fr active Pending
- 1969-10-20 DE DE19691953503 patent/DE1953503C3/en not_active Expired
- 1969-10-21 NL NL6915894A patent/NL149931B/en not_active IP Right Cessation
Also Published As
Publication number | Publication date |
---|---|
DE1953503B2 (en) | 1972-04-20 |
DE1953503A1 (en) | 1970-07-16 |
NL6915894A (en) | 1970-04-23 |
JPS4911934B1 (en) | 1974-03-20 |
FR2021150A1 (en) | 1970-07-17 |
DE1953503C3 (en) | 1979-03-08 |
NL149931B (en) | 1976-06-15 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed | ||
PE20 | Patent expired after termination of 20 years |