Two wire autobias vehicular microphone system having user input functionality and method of forming same
First Claim
1. An autobias vehicular microphone system comprising:
- at least one microphone;
an amplifier connected to the at least one microphone for amplifying an output of the at least one microphone;
a first feedback path providing an amplifier output signal to the amplifier input for providing amplifier linearity; and
a second feedback path for providing bias to a voltage reference,wherein at least one switch is connected to the second feedback path for altering the voltage reference; and
wherein the alteration of the voltage reference is interpreted as an actuation of the at least one switch for controlling an electronic device used with the at least one microphone.
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Accused Products
Abstract
An autobias vehicular microphone system (300) includes a microphone (301) which uses an amplifier (306) for amplifying an output of the microphone. A first feedback path (308) provides an amplifier output signal to the amplifier input for providing amplifier linearity, and a second feedback path (305) is used for providing bias to a voltage reference (303). The voltage reference (303) operates to provide an autobias to the amplifier (306) based upon amplifier load-ing. By holding the bias point to a constant voltage, a constant clip level can be maintained depending on varying load conditions of electronic devices (307, 309, 311) using the microphone (301). Additionally, one or more switches can be used to vary the bias point which can be interpreted to control functionality of the electronic devices (307, 309, 311).
14 Citations
34 Claims
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1. An autobias vehicular microphone system comprising:
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at least one microphone; an amplifier connected to the at least one microphone for amplifying an output of the at least one microphone; a first feedback path providing an amplifier output signal to the amplifier input for providing amplifier linearity; and a second feedback path for providing bias to a voltage reference, wherein at least one switch is connected to the second feedback path for altering the voltage reference; and wherein the alteration of the voltage reference is interpreted as an actuation of the at least one switch for controlling an electronic device used with the at least one microphone. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. An autobias microphone system for use in a vehicular mirror comprising:
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at least one microphone for producing an audio output; an amplifier for increasing the amplitude of the audio output; an audio feedback path for providing feedback from an output of the amplifier to an input of the amplifier for providing amplifier linearity; and a direct current (DC) feedback path for providing a dynamic bias to a voltage reference for adjusting the dynamic bias to the amplifier depending on the number of electronic devices using the at least one microphone, wherein at least one switch is connected to the second feedback path for altering the voltage reference and providing user input functionality; and wherein the alteration of the voltage reference is interpreted as an actuation of the at least one switch for controlling functions of the electronic devices used with the at least one microphone. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. A method for providing autobias to an automotive microphone system comprising the steps of:
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producing an audio output using at least one microphone; increasing the output of the audio output using an amplifier; providing an output of the amplifier to an input of the amplifier using an alternating current (AC) feedback from an amplifier output to an amplifier input for providing amplifier stability; and providing a dynamic bias to a voltage reference using a direct current (DC) feedback path, providing at least one switch connected to the DC feedback path for alternating the voltage reference; altering the voltage reference by actuating the at least one switch; and interpreting a change in the voltage reference for controlling functionality of an electronic device used with the at least one microphone. - View Dependent Claims (24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34)
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Specification