US4045748A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Audio control system
Assignee: Magnavox Electronic Systems Co
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Filing: 1975-12-19
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Granted: 1977-08-30
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Expires: 1995-12-19
Abstract
Abstract An audio control system for altering the frequency content of an audio signal with a d.c. control voltage. An audio signal is divided into a plurality of signal channels representing different portions of the audio signal frequency spectrum. Each signal channel is terminated by an attenuator which is responsive to a d.c. control voltage. The attenuated signals are then combined. By changing a d.c. control voltage a change in tone, volume, balance or loudness of an audio signal in a stereoamplifier or the like may be achieved.
Inventors
- 👤 Paul Filliman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 18:56
CPC Classifications
H; H03; H03G; H03G3/00; H03G3/02; H03G3/04; H03G3/10; H03G5/00; H03G5/02; H03G5/04; H03G5/10; H03G9/00; H03G9/02; H03G9/12; H03G9/14; H04; H04R; H04R3/00; H04R3/04
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
110 words
An audio control apparatus for controlling a signal comprising: a. a plurality of frequency selective filters, said filters having a common input for receiving an audio signal; b. a plurality of differential amplifiers for receiving said filter output signals each of said differential amplifiers providing biphase signal currents in response to an input voltage; c. a plurality of attenuators for controlling said biphase signal currents produced by each of said differential amplifiers, said attenuators having a selectable attenuation level; and d. means for combining said attenuator output signals to form a composite signal, said composite signal having a frequency spectrum dependent upon the relative attenuation levels provided by said attenuators.
Claim 2
Dependent Claim
110 words
An audio control apparatus for controlling a signal comprising: a. a plurality of frequency selective filters, said filters having a common input for receiving an audio signal; b. a plurality of differential amplifiers for receiving said filter output signals each of said differential amplifiers providing biphase signal currents in response to an input voltage; c. a plurality of attenuators for controlling said biphase signal currents produced by each of said differential amplifiers, said attenuators having a selectable attenuation level; and d. means for combining said attenuator output signals to form a composite signal, said composite signal having a frequency spectrum dependent upon the relative attenuation levels provided by said attenuators.
Claim 3
Independent Claim
75 words
An apparatus for controlling an audio signal comprising: a. means for dividing said signal into a plurality of biphase signals having different frequency spectri; b. a plurality of quadrature attenuators for selectively varying the amplitude of each of said biphase signals representing different frequency spectri; and c. means for combining said quadrature attenuator output signals whereby a composite signal is formed having a frequency spectrum dependent upon the relative attenuation levels provided by said attenuators.
Claim 4
Independent Claim
75 words
An apparatus for controlling an audio signal comprising: a. means for dividing said signal into a plurality of biphase signals having different frequency spectri; b. a plurality of quadrature attenuators for selectively varying the amplitude of each of said biphase signals representing different frequency spectri; and c. means for combining said quadrature attenuator output signals whereby a composite signal is formed having a frequency spectrum dependent upon the relative attenuation levels provided by said attenuators.
Claim 5
Independent Claim
112 words
An apparatus for controlling the frequency content of an audio signal comprising: a. means for dividing an audio signal into first and second signals having different frequency spectri; b. a first attenuator means for receiving said first signal of said means for dividing, said attenuator means having a selectable attenuation level; c. a second attenuator means for receiving said second signal of said means for dividing, said attenuator means having a selectableattenuation level; and d. a means for combining said audio signal with said first and second attenuator means output signals to produce a third signal having a frequency spectrum which is controllable by selectively varying the attenuation level of said attenuators.
Claim 6
Independent Claim
112 words
An apparatus for controlling the frequency content of an audio signal comprising: a. means for dividing an audio signal into first and second signals having different frequency spectri; b. a first attenuator means for receiving said first signal of said means for dividing, said attenuator means having a selectable attenuation level; c. a second attenuator means for receiving said second signal of said means for dividing, said attenuator means having a selectableattenuation level; and d. a means for combining said audio signal with said first and second attenuator means output signals to produce a third signal having a frequency spectrum which is controllable by selectively varying the attenuation level of said attenuators.
Claim 7
Independent Claim
134 words
An apparatus for controlling the frequency content of an audio signal comprising: a. a first filter means for removing the low frequency content of said audio signal; b. a second filter means for removing the high frequency content of said audio signal; c. a first attenuator for selectively controlling the amplitude of said first filter means output signal; d. a second attenuator for selectively controlling the amplitude of said second filter means output signal; e. a bandpass filter for simultaneously removing the high and low frequency components of said audio signal; and f. signal combining means for combining the outputs of said first attenuator, said second attenuator, and said bandpass filter whereby a composite signal is formed having a selectable frequency spectrum dependent upon the amplitude of said first and second attenuator output signals.
Claim 8
Independent Claim
134 words
An apparatus for controlling the frequency content of an audio signal comprising: a. a first filter means for removing the low frequency content of said audio signal; b. a second filter means for removing the high frequency content of said audio signal; c. a first attenuator for selectively controlling the amplitude of said first filter means output signal; d. a second attenuator for selectively controlling the amplitude of said second filter means output signal; e. a bandpass filter for simultaneously removing the high and low frequency components of said audio signal; and f. signal combining means for combining the outputs of said first attenuator, said second attenuator, and said bandpass filter whereby a composite signal is formed having a selectable frequency spectrum dependent upon the amplitude of said first and second attenuator output signals.
Claim 9
Dependent Claim
20 words
An audio signal control apparatus of claim 4 further comprising a third attenuator for receiving said signal combiner output signal.
Claim 10
Dependent Claim
21 words
An audio signal control apparatus of claim 5 further comprising an amplifier for receiving the output signal of said third attenuator.
Claim 11
Independent Claim
153 words
An apparatus for controlling an audio signal comprising: a. means for dividing an audio signal into first biphase signal currents, second biphase signal currents, and third biphase signal currents, each of said biphase signal currents representing a different portion of said audio signal frequency spectrum; b. a first attenuator for receiving said first biphase signal currents, said attenuator having a selectable attenuation level for controlling the amplitude of said biphase signal currents; c. a second attenuator for receiving said second biphase signal currents, said attenuator having a selectable attenuation level for controlling the amplitude of said biphase currents; d. means for combining said third biphase signal currents with said first and second attenuator output signals to produce fourth biphase signal currents; and e. means for converting said fourth biphase signal currents into a single phase signal voltage, said signal voltage having a frequency spectrum dependent upon the relative attenuation provided by said attenuators.
Claim 12
Independent Claim
153 words
An apparatus for controlling an audio signal comprising: a. means for dividing an audio signal into first biphase signal currents, second biphase signal currents, and third biphase signal currents, each of said biphase signal currents representing a different portion of said audio signal frequency spectrum; b. a first attenuator for receiving said first biphase signal currents, said attenuator having a selectable attenuation level for controlling the amplitude of said biphase signal currents; c. a second attenuator for receiving said second biphase signal currents, said attenuator having a selectable attenuation level for controlling the amplitude of said biphase currents; d. means for combining said third biphase signal currents with said first and second attenuator output signals to produce fourth biphase signal currents; and e. means for converting said fourth biphase signal currents into a single phase signal voltage, said signal voltage having a frequency spectrum dependent upon the relative attenuation provided by said attenuators.
Claim 13
Dependent Claim
19 words
The apparatus of claim 7 further comprising an attenuator for controlling the magnitude of said fourth biphase signal currents.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-08-29 | 1981-02-28 | 1981-08-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-08-29 | 1985-02-28 | 1985-08-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-08-29 | 1989-02-28 | 1989-08-30 | $7700.00 | Window Closed / Lapsed |