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US 4,292,467 AGranted
Control for audio receiver
AssigneeTranscale AB
InventorsLars Odlen, Anders Hansson
Life of this patent
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AssigneeTranscale AB
InventorsLars Odlen, Anders Hansson
Estimating the term…
An audio receiver or other electronic device having a number of controllable functions is provided with control apparatus in which mechanical parts have been substantially eliminated. An electrically controllable device is provided to control each function. Memory registers provide inputs to the electrically controllable devices. The controllable functions may be on-off, as for a particular signal source, or may be variable, as for volume, tuning and tone in a receiver. Input controls include a single level control for adjusting the levels of all of the variable functions, and switches to select the function to be adjusted. Control means such as a microprocessor scans the switches and level control for changes in level and/or functions selected and updates the memory registers accordingly. A display is provided of selected functions and level.
Apparatus for use in controlling a plurality of analog signal processing means, each responsive to an associated analog input signal for modifying an associated characteristic of said input signal to a variable extent, said apparatus comprising;
Apparatus for use in controlling a plurality of analog signal processing devices, each of which devices functions to modify an associated characteristic of an associated input signal to a variable extent, comprising:
Apparatus for controlling volume and balance in a stereophonic receiver comprising:
Control apparatus for an audio receiver having a plurality of audio signal processing devices each providing a variable modification in an associated characteristic of an associated audio signal comprising a plurality of electrically controllable means each associated with a corresponding one of said audio signal processing devices for setting the extent of modification of the associated audio signal, a plurality of addressable registers each coupled to a corresponding one of said electrically controllable means for storing and providing to the associated electrically controllable means a digital signal determining the extent of modification of the associated audio signal, a single adjusting means for providing adjustment signals indicating the magnitude and direction of a desired change in signal processing by a selected signal processing means, a memory for storing the addresses of said addressable registers and their respectively associated digital signals, means for selecting one of said audio signal processing devices for adjustment, display means, and control means for causing said display means to display an indication of the extent of signal modification being provided by the selected audio signal processing device, for determining an adjusted digital signal for the selected audio signal processing device in accordance with said adjustment signal and for providing said adjusted digital signal to said register for the selected audio signal processing device.
A tone control for an audio receiver comprising:
A method for tone control in an audio receiver receiving an incoming audio signal comprising the steps of filtering said audio signal to obtain a low frequency component and a high frequency component, substracting said low frequency component from said audio signal to yield a treble signal, subtracting said high frequency component from said audio signal to obtain a bass signal, subtracting said treble signal and said bass signal from said audio signal to obtain a midrange signal, controlling the amplitudes of said treble, bass, and midrange signals, and summing said amplitude controlled treble, bass and midrange signals to derive a tone controlled audio signal.
Apparatus for processing an audio signal, comprising a tone control circuit for modifying the frequency versus amplitude characteristics of said audio signal in accordance with control signals provided thereto, manual tone adjustment means for providing manually adjustable control signals for said tone control circuit to control the modification thereby of said frequency versus amplitude characteristics of said audio signal, means for selecting a loudness function defining the fashion in which the frequency versus amplitude characteristics of said audio signal is to change with volume of said audio signal, and correction control means responsive to the selection of said function, to said manually adjustable control signals, and to a change in volume level for deriving corrected control signals for provision to said tone control circuit for adjusting said frequency versus amplitude characteristic of said audio signal in accordance with said loudness function whereby a single tone control circuit is used for both tone adjustment and loudness function adjustment of said audio signal's frequency versus amplitude characteristics.
Dependencies are inferred from the claim text.