US4868869A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Digital signal processor for providing timbral change in arbitrary audio signals
Assignee: YIELD SECURITIES Inc D/B/A CLARITY A CORP OF NEW YORK
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Filing: 1988-01-07
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Granted: 1989-09-19
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Expires: 2008-01-07
Abstract
Abstract An audio signal processor in which the harmonic content of the output signal varies with the amplitude of the input signal. The preferred embodiment includes an analog to digital converter, a sample and hold circuit, timing circuits, a RAM look-up table for performing non-linear transformation, a digital to analog converter and a post filter from which processed analog audio is output.
Inventors
- 👤 Gregory Kramer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 07:43
CPC Classifications
G; G10; G10H; G10H5/00; G10H5/005; G10H1/00; G10H1/0091; G10H1/02; G10H1/06; G10H1/16; G10H7/00; G10H7/008; G10H7/02; G10H2210/00; G10H2210/155; G10H2210/265; G10H2210/281; G10H2250/00; G10H2250/131; G10H2250/165; G10H2250/175; G10H2250/181; G10H2250/191
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
121 words
A digital audio signal processor comprising input means for receiving arbitrary analog audio input signals; input conversion means for converting said analog audio input signals into input digital signals which are representative of the instantaneous amplitudes of the audio input signal; non-linear transformation means for translating on a real time basis said input digital signals in accordance with a pre-determined translation map to produce the same output digital signal amplitude for a given input digital signal amplitude; and output conversion means for converting said output digital signal amplitude into analog form as an analog output signal, whereby said analog audio input signals are processed in real time, non-linearly modified by said non-linear transformation means, and outputted and reproduced in audible form.
Claim 2
Dependent Claim
121 words
A digital audio signal processor comprising input means for receiving arbitrary analog audio input signals; input conversion means for converting said analog audio input signals into input digital signals which are representative of the instantaneous amplitudes of the audio input signal; non-linear transformation means for translating on a real time basis said input digital signals in accordance with a pre-determined translation map to produce the same output digital signal amplitude for a given input digital signal amplitude; and output conversion means for converting said output digital signal amplitude into analog form as an analog output signal, whereby said analog audio input signals are processed in real time, non-linearly modified by said non-linear transformation means, and outputted and reproduced in audible form.
Claim 3
Dependent Claim
20 words
A digital audio signal processor as defined in claim 1, wherein said non-linear transformation means comprises a look-up table (LUT).
Claim 4
Dependent Claim
21 words
A digital audio signal processor as defined in claim 1, wherein said non-linear transformation means comprises a digital signal processor (DSP).
Claim 5
Dependent Claim
30 words
A digital audio signal processor as defined in claim 1, further comprising timing means for generating timing signals for synchronized operation of the elements of the digital audio signal processor.
Claim 6
Dependent Claim
25 words
A digital audio signal processor as defined in claim 1, further comprising post filtering means for smoothing out the output from said output conversion means.
Claim 7
Dependent Claim
70 words
A digital audio signal processor as defined in claim 1, further comprising host computer means for generating host input addresses and host output data, and further comprising switching means for selecting an array input address from between said host computer and an incoming digital audio signal, the read/write status of an array, and a destination for the array, input/output data from between a host computer bus and output conversion circuitry.
Claim 8
Dependent Claim
32 words
A digital audio signal processor as defined in claim 1, further comprising a graphic entry means for generating values to be stored in said non-linear transformation means to create said translation map.
Claim 9
Dependent Claim
18 words
A digital audio signal processor as defined in claim 9, wherein said graphic entry means comprises a mouse.
Claim 10
Dependent Claim
18 words
A digital audio signal processor as defined in claim 7, wherein said graphic entry means comprises a pen.
Claim 11
Dependent Claim
18 words
A digital audio signal processor as defined in claim 7, wherein said graphic entry means comprises a joystick.
Claim 12
Dependent Claim
40 words
A digital audio signal processor as defined in claim 1, further comprising computer means for generating a translation map consisting of at least one of the following mapping elements: sinewave, line segments, splines, arbitrary polynominals, Chebyshev polynominals and pseudo-random numbers.
Claim 13
Dependent Claim
23 words
A digital audio signal processor as defined in claim 11, further comprising interpolation means for interpolating at least one of said mapping elements.
Claim 14
Dependent Claim
23 words
A digital audio signal processor as defined in claim 11, further comprising smoothing means for smoothing at least one of said mapping elements.
Claim 15
Dependent Claim
28 words
A digital audio signal processor as defined in claim 1, further comprising pre-scaling means for establishing portions of said translation map to be accessed by the incoming audio.
Claim 16
Dependent Claim
24 words
A digital audio signal processor as defined in claim 14, further comprising adjustment means for adjusting the degree of pre-scaling by said pre-scaling means.
Claim 17
Dependent Claim
30 words
A digital audio signal processor as defined in claim 1, further comprising modulating means for modulating a digital output from said non-linear transformation means by means of a carrier frequency.
Claim 18
Dependent Claim
20 words
A digital audio signal processor as defined in claim 1, further comprising reverberation means cooperating with said non-linear transformation means.
Claim 19
Dependent Claim
49 words
A digital audio signal processor as defined in claim 1, comprising a plurality of non-linear transformation means for processing said incoming audio signals in accordance with different translation maps; and summing means for adding the outputs of said nonlinear transformation means prior to processing by said output conversion means.
Claim 20
Dependent Claim
61 words
A digital audio signal processor as defined in claim 1, further comprising frequency separation means for separating said incoming audio into its constituted frequencies; and a plurality of non-linear transformation means each arranged to process one of a plurality of frequency carriers; and means for summing the output of the non-linear transformation means prior to processing by said output conversion means.
References Cited (Backward Citations)
US4045616A
Cited
US4300432A
Cited
US4464784A
Cited
US4569268A
Cited
US4661982A
Cited
US4681008A
Cited
US4611300A
Cited
US4731852A
Cited
US4706291A
Cited
US4754680A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-09-18 | 1993-03-20 | 1993-09-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-09-18 | 1997-03-20 | 1997-09-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-09-18 | 2001-03-20 | 2001-09-19 | $7700.00 | Window Closed / Lapsed |