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| Number | Title | Issue Date |
| 7391873 | Microphone with voltage pump An integrated circuit (102) configured to provide a microphone output signal, comprising: a preamplifier (108) coupled to receive an input signal, generated by a first microphone member that is movable relative to a second microphone member; and a volt... | 06/24/2008 |
| 7372967 | Microphone bias circuit A microphone bias circuit includes a first integrated circuit (IC) pin, a second IC pin, a first resistor, and a variable supply voltage buffer. The first resistor is operably coupled to the first IC pin and a return voltage. The second IC pin is operably coupled to... | 05/13/2008 |
| 7130434 | Microphone PCB with integrated filter The present invention provides a solution to the needs described above through a microphone PCB with an integrated filter. The invention provides for an electret microphone assembly. The microphone assembly includes a multilayer printed circuit board. A field effect... | 10/31/2006 |
| 6668204 | Biaural (2channel listening device that is equalized in-stu to compensate for differences between left and right earphone transducers and the ears themselves Described is a device and method using an interactive process to improve the listening experience for a user of headphones or hearing aids. The system uses a sound source such as a PC or similar device. Programming of the headphone or hearing aid is accom... | 12/23/2003 |
| 6516069 | Microphone filter and microphone unit A large-time-constant microphone filter which contains resistance and capacitance as its constituent and can be formed in the same semiconductor chip as a microphone unit is achieved, which results in downsizing and cost reduction of the microphone unit. ... | 02/04/2003 |
| 5832076 | Apparatus and method for determining the presence and polarity of direct current bias voltage for microphones in telephone sets An apparatus and method for determining the presence and polarity of DC bias voltage at a telephone microphone. A circuit can be added in parallel between any hand or headset and a telephone base unit. The circuit converts the DC bias voltage, if any, acr... | 11/03/1998 |
| 5357577 | Vacuum tube microphone apparatus A microphone apparatus including a vacuum-tube amplifier amplifying an electric signal converted from an acoustic signal includes a thermo-ionic cooling element having two surfaces, in which a first surface is in contact with the vacuum-tube amplifier for... | 10/18/1994 |
| 4985910 | Method and apparatus for retrofitting a standard coin operated telephone employing a carbon microphone with a line powered electronic controller A method and apparatus to enable a low power telephone controller to operate with either a carbon microphone or a dynamid microphone is described. A jumper in a preamplifier and filter circuit is preset to accommodate the audio transfer characteristics of... | 01/15/1991 |
| 4589136 | Circuit for suppressing amplitude peaks caused by stop consonants in an electroacoustic transmission system A circuit in an electroacoustic transmission system suppresses amplitude peaks which are caused by the utterance of a stop consonant such as a "P". A microphone of the transmission system has an output which a high-pass filter is connected. The high-pass ... | 05/13/1986 |
| 4476348 | Carbon microphone linearization technique A technique for reducing the nonlinear frequency characteristics of a carbon granule microphone of the type generally used in telephone handsets wherein a tone outside the voice range is applied to the microphone simultaneously with the audio signal desir... | 10/09/1984 |
