EP0218912A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Special effects device for an electronic musical instrument
Assignee: Casio Computer Co Ltd
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Filing: 1986-09-09
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Granted: —
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Expires: 2006-09-09
Abstract
Abstract An input waveform signal is converted in an A/D converter (6) into a digital signal to be written in a waveform memory (7) under control of a tone generation control unit (8). The written digital signal is read out from the waveform memory (7) with a designated delay time. The input waveform signal and the digital signal read out from the waveform memory (7) are converted in a D/A converter (10) into analog signals which are fed through VCFs (12a-12d) and VCAs (13a-13d) so as to be sounded. Further, in the above arrangement the timbre and tone volume controls are done independently for the individual waveform read/write channels through VCFs (12a-12d) and VCAs (13a-13d). Thus, it is possible to obtain a further effected sound.
Inventors
- 👤 Kohtaro Pt. Hanzawa
- 👤 Shigenori Pt. Morikawa
- 👤 Kazuhisa Nakamura
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-03 05:32
CPC Classifications
H; H03; H03G; H03G5/00; H03G5/005; G; G10; G10H; G10H1/00; G10H1/18; G10H1/183; G10H1/187; G10H5/00; G10H5/002; G10H7/00; G10H7/02
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
177 words
I. An effector comprising analog-to-digital conversion means for converting an input analog waveform signal into a digital signal, and waveform memory means for storing the digital signal provided from said analog-to-digital conversion means thereby providing a predetermined effect on an acoustic signal produced on the basis of the digital signal read out from said waveform memory, characterized by further comprising: control means (9) having a plurality of waveform read/write channels for effecting the reading and writing of said digital signal with respect to said waveform memory means (7); read control means (8) for causing said digital signal from said analog-to-digital conversion means (6) to be written in said waveform memory means - (7) through one of said waveform read/write channels of said control means and causing said written digital signal to be read out from said waveform memory means through at least two other said waveform read/write channels of said control means; and sounding means (10-13) for converting said digital signals read out through at least two said waveform read/write channels into analog signals to be sounded.
Claim 2
Dependent Claim
54 words
The effector according to claim I, characterized in that: said digital signal obtained from said analog-to-digital conversion means (6) is fed together with said digital signals read out from said waveform memory means (7) through said at least two waveform read/write channels of said control means to said sounding means (10-13) to be sounded.
Claim 3
Dependent Claim
45 words
The effector according to claim I, characterized in that: said read control means (8) includes delay time setting means (80, 80A) for setting delay times when said digital signal is read out from said waveform memory means through at least two said waveform read/write channels.
Claim 4
Dependent Claim
53 words
The effector according to claim I, characterized in that: said sounding means (10-13) includes processing means for effecting a predetermined processing on said digital signal read out from said waveform memory means for control of at least timbre and tone volume independently for a plurality of waveform read/write channels of said control means.
Claim 5
Dependent Claim
71 words
The effector according to claim I, characterized in that: said sounding means (10-13) includes voltage controlled filters (12a-l2f) each provided for each of said waveform read/write channels of said control means and capable of independent variation of filter characteristics, and said digital signals read out through said at least two waveform read/write channels are converted into analog signals and then filtered through corresponding said voltage controlled filters (12a-12d) before being sounded.
Claim 6
Dependent Claim
36 words
The effector according to claim 5, characterized in that: said effector further comprises feedback means (14-16) for feeding back waveform signals provided from said plurality of voltage controlled filters (12a-12d) to said analog-to-digital conversion means (6).
Claim 7
Dependent Claim
98 words
The effector according to claim I, characterized in that: said effector further comprises setting means (18) for setting a maximum or minimum delay time when reading out said digital signals from said waveform memory means (7) through at least two said waveform read/write channels; and said read control means (8) includes means for setting a delay time for each of at least two said waveform read/write channels on the basis of said maximum or minimum delay time set by said setting means for reading out said digital signal from said waveform memory means with each said delay time.
Claim 8
Dependent Claim
59 words
The effector according to claim 7, characterized in that: said read control means includes calculation means (93) for setting the delay times for at least two said waveform read/write channels on the basis of said maximum or minimum delay time set by said setting means such that the delay time ratio of each said calculated delay time is constant.
Claim 9
Dependent Claim
41 words
The effector according to claim I, characterized in that: said effector further comprises digital multiplication means (90) for multiplying said digital signals read out through at least two said waveform read/write channels by multiplication data with the values thereof determined independently.
Claim 10
Dependent Claim
59 words
The effector according to claim 9, characterized in that: said digital signal obtained from said analog-to-digital conversion means (6) is fed together with said digital signals read out from said waveform memory means (7) through at least two said waveform read/write channels of said control means (9) to said digital multiplication means for multiplication by said corresponding multiplication data.
Claim 11
Dependent Claim
83 words
II. The effector according to claim I, characterized in that: said read control means (8) causes said digital signal from said analog-to-digital conversion means (6) to be written in said waveform memory means - (7) at a predetermined rate through one of said waveform read/write channel of said control means and causes said digital signal written in said waveform memory to be read out at rates different from said predetermined rate through at least two said waveform read/write channels of said control means.
Claim 12
Dependent Claim
53 words
The effector according to claim II, characterized in that: the rates at which said digital signal is read out from said waveform memory means through at least two said waveform read/write channels of said control means are varied with time, thereby providing a frequency modulation to the sound output of said sounding means.
Claim 13
Dependent Claim
23 words
The effector according to claim 12, characterized in that: said effector includes display means (4) for displaying the form of said frequency modulation.
Claim 14
Dependent Claim
57 words
The effector according to claim I, characterized in that: said effector further comprises feedback means (14-16) for reading out said digital signal written in said waveform memory means (7), combining said read- out digital signal with said digital signal obtained through conversion of said input waveform signal and writing the resultant signal in said waveform memory means.
Claim 15
Dependent Claim
94 words
An effector comprising: sampling means for receiving an input signal and sampling said input signal at a predetermined sam- piing frequency; and memory means for storing a digital waveform signal provided from said sampling means; characterized by further comprising output means for reading out said digital signal written in said waveform memory means (7) as at least two digital waveform signals and providing said read-out digital waveform signals with a predetermined effect provided thereto; and sounding means (10-13) for obtaining a sound output on the basis of waveform signals provided from said output means.
Claim 16
Dependent Claim
37 words
The effector according to claim 15, characterized in that: said output means reads out a plurality of said digital waveform signals simultaneously from said waveform memory means through a time division multiplexing of a plurality of channels.
Claim 17
Dependent Claim
157 words
A digital effector comprising: analog-to-digital conversion means for sampling an input waveform signal at a predetermined sampling frequency for conversion into a digital signal; waveform memory means for storing a digital signal provided from said analog-to-digital conversion means; characterized by further comprising control means including a plurality of waveform read/write channels for writing and reading said digital signal with respect to said waveform memory means (7); read control means (9) for causing said digital signal from said analog-to-digital conversion means (6) to be written in said waveform memory means - (7) through one of said waveform read/write channels of said control means and causing said digital signal written in said waveform memory means to be read out through at least two of said waveform read/write channels of said control means; and digital multiplication means (90) for multiplying said digital signals read out through at least two said waveform read/write channels by multiplication data having independently determined values.
Claim 18
Dependent Claim
59 words
The digital effector according to claim 17, characterized in that: said digital signal obtained from said analog-to-digital conversion means (6) is fed together with said digital signals read out from said waveform memory means through at least two said waveform read/write channels of said control means to said digital multiplication means (90) for multiplication by said corresponding multiplication data.
Claim 19
Dependent Claim
156 words
A digital effector comprising: analog-to-digital conversion means for sampling an input waveform signal at a predetermined sampling frequency for conversion into a digital signal; waveform memory means for storing a digital signal provided from said analog-to-digital conversion means; characterized by further comprising control means (8) including a plurality of waveform read/write channels for writing and reading said digital signal with respect to said waveform memory means (7); read control means for causing said digital signal from said analog-to-digital conversion means (6) to be written in said waveform memory means (7) through one of said waveform read/write channels of said control means (8) and causing said digital signal written in said waveform memory means to be read out through at least two of said waveform read/write channels of said control means (8); and sounding means (10-13) for converting said digital signals read out through at least two said waveform read/write channels into analog signals to be sounded.
Claim 20
Dependent Claim
56 words
The digital effector according to claim 19, characterized in that: the rates at which said digital signal is read out from said waveform memory means (7) through at least two said waveform read/write channels of said control means (8) are varied with time, thereby providing frequency modulation to the sound output of said sounding means (10-13).
Claim 21
Dependent Claim
99 words
A digital effector, in which an input waveform signal is converted into a digital signal and said digital signal is written in waveform memory means, said digital signal written in said waveform memory means being read out and converted into an analog signal before being sounded, characterized in that: said digital effector comprises feedback means (14-16) for reading out said digital signal written in said waveform memory means (7), digitally synthesizing said read-out digital signal with said digital signal obtained through conversion of said input waveform signal and feeding back the resultant signal to said waveform memory means (7).
Claim 22
Dependent Claim
33 words
The digital effector according to claim 21, characterized in that: said feedback means (10-13) includes means (13a-13d) for varying the gain of digital signal provided from said waveform memory means (7) for feedback.
References Cited (Backward Citations)
No citation records indexed.
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