Automatically configured audio system
First Claim
Patent Images
1. Audio apparatus comprising:
- power amplifier means having an output for selectively connecting to a speaker;
speaker sensing means coupled to said power amplifier output for providing a signal indicating when a speaker is and is not connected to said power amplifier output;
function selection means for sequentially selecting from a plurality of audio functions for adjustment, said audio functions including a relative gain function for adjustment of the gain of said power amplifier means;
display means for displaying each of said audio functions as they are selected for adjustment; and
control means coupled to said speaker sensing means, said function selection means, and said display means for preventing selection and display of said relative gain function as one of said audio functions when said speaker sensing means provides a signal indicating that no speaker is connected to said power amplifier output.
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Abstract
An audio system has menu-driven controls using a select button to scan through possible functions and uses up and down adjustment buttons to modify the selected function. The menu of selected functions is automatically altered according to the presence of front and rear speakers to avoid any confusion from presenting a fade function on the menu when in fact there are not both front and rear speakers connected to the system.
67 Citations
9 Claims
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1. Audio apparatus comprising:
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power amplifier means having an output for selectively connecting to a speaker; speaker sensing means coupled to said power amplifier output for providing a signal indicating when a speaker is and is not connected to said power amplifier output; function selection means for sequentially selecting from a plurality of audio functions for adjustment, said audio functions including a relative gain function for adjustment of the gain of said power amplifier means; display means for displaying each of said audio functions as they are selected for adjustment; and control means coupled to said speaker sensing means, said function selection means, and said display means for preventing selection and display of said relative gain function as one of said audio functions when said speaker sensing means provides a signal indicating that no speaker is connected to said power amplifier output. - View Dependent Claims (2, 3, 4, 5)
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6. A method for determining the presence of a rear speaker in an automotive audio system having a power amplifier for driving said rear speaker, said method comprising the steps of:
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connecting the output of said power amplifier to a voltage supply through a resistance; unmuting said power amplifier; waiting for a predetermined time to allow the voltage at said power amplifier output to stabilize; and indicating the presence or nonpresence of a rear speaker depending on said voltage at said Power amplifier output.
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7. A method of operating a menu-driven automotive audio system including a menu display, a function selector, and a power amplifier for driving a rear speaker if present, said method comprising the steps of:
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connecting the output of said power amplifier to a voltage supply through a resistance; unmuting said power amplifier; waiting for a predetermined time to allow the voltage at said power amplifier output to stabilize; indicating the presence or nonpresence of a rear speaker depending on said voltage at said power amplifier output; displaying one of a plurality of audio functions on said menu display; sequencing to the display of another one of said audio functions in response to actuation of said function selector; and preventing display of any audio function requiring a rear speaker if the nonpresence of a rear speaker is indicated. - View Dependent Claims (8)
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9. Audio apparatus comprising:
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power amplifier means having a plurality of outputs for connecting to a plurality of speakers; speaker sensing means coupled to said power amplifier means for providing a signal indicating when a speaker is and is not connected to one of said power amplifier outputs; function selection means for sequentially selecting from a plurality of audio functions for adjustment, said audio functions including a relative gain function for adjustment of the gain to be provided for said one power amplifier output relative to the gain to be provided for another one of said Power amplifier outputs; display means for displaying each of said audio functions as they are selected for adjustment; and control means coupled to said speaker sensing means, said function selection means, and said display means for Preventing selection and display of said relative gain function as one of said audio functions when said speaker sensing means Provides a signal indicating that no speaker is connected to said one power amplifier output.
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Specification