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Magnetic sensor for a transducerRelated Patent Categories: Electrical Audio Signal Processing Systems And Devices, Hearing Aids, Electrical, Specified Casing Or Housing, Non-air-conducted Sound DeliveryMagnetic sensor for a transducer description/claimsThe Patent Description & Claims data below is from USPTO Patent Application 20080095391, Magnetic sensor for a transducer. Brief Patent Description - Full Patent Description - Patent Application Claims
CROSS-REFERENCE TO RELATED APPLICATIONS [0001] This patent is a continuation of U.S. Ser. No. 11/464,641, filed Aug. 15, 2006, which is a continuation of U.S. Ser. No. 10/736,151, filed Dec. 15, 2003, which claims the benefit of U.S. Provisional Patent Application No. 60/433,486, filed Dec. 13, 2002, the disclosures of which are hereby incorporated herein by reference in its entirety for all purposes. TECHNICAL FIELD [0002] This patent relates to assisted-listening systems. More specifically, this patent relates to an assisted-listening device capable of determining and adapting to surrounding environmental conditions. BACKGROUND [0003] Assisted-listening devices, e.g., hearing aids and the like, should be capable of operating in, and being adaptable to, several environmental conditions. For example, the assisted-listening device should to be capable of automatically selecting amongst various audio sources, e.g., telecoil, microphone, or auxiliary. One commercially available hearing aid utilizes a magnetic reed switch to provide magnetic field detection and automatic transducer mode selection. Unfortunately, there are a number of limitations associated with utilizing the magnetic reed switch. Frequently, the reed switch lacks the sensitivity to operate with many types of telephones and often requires placing an external magnet onto the telephone handset earpiece. Additionally, the reed switch requires use of a portion of the communicate device, such as a very limited space within the hearing aid. Furthermore, the reed switch may be susceptible to damage or performance changes if the hearing aid is dropped or subjected to extremely high magnetic fields--thus undermining the effective reliability of the assisted-listening system. Another shortcoming involves the added costs that are incurred to implement the reed switch into the assisted-listening system due to the additional components and manufacturing effort required. BRIEF DESCRIPTION OF THE DRAWINGS [0004] For a more complete understanding of the disclosure, reference should be made to the following detailed description and accompanying drawings wherein: [0005] FIG. 1 is a schematic block diagram of an integrated circuit in accordance with an embodiment of the invention; [0006] FIG. 2 is a schematic block diagram of an integrated circuit in accordance with another embodiment of the invention; and [0007] FIG. 3 is a schematic block diagram of an integrated circuit in accordance with still another embodiment of the invention. DETAILED DESCRIPTION [0008] One of the described embodiments is directed to a system and method for assisting listening e.g. hearing devices and methods of facilitating hearing, and the like, wherein an integrated circuit facilitates selection of an audio source mode in response to the detection of an external magnetic field. In the exemplary embodiment, an integrated circuit for an assisted-listening device is operably disposed between a plurality of audio sources and a signal processing circuit. The integrated circuit may include a magnetic field sensor and a threshold comparator. A gate, e.g., a multiplexer, may be operably coupled and responsive to the output from the magnetic field threshold comparator. The gate may include a plurality of inputs being capable of coupling to a variety of transducer outputs or auxiliary audio sources, e.g., magnetic (telecoil), acoustic (microphone). In response to the presence of a magnetic field, one of the audio sources or transducer outputs is selected to be output to the signal processing circuit. [0009] In an alternate described embodiment, a manual override mode may be provided for allowing multiple audio source outputs and/or transducer outputs to be simultaneously presented to the signal processing circuit. [0010] In still another described embodiment, an integrated circuit is operably disposed between a plurality of audio sources and a signal processing circuit. The integrated circuit may include a sensor for detecting an external magnetic field presence. A magnetic field threshold comparator may be operably connected to the sensor. A gate is operably responsive to the magnetic field threshold comparator. The gate includes a plurality of inputs and a gate output. The plurality of inputs are connected to the plurality of audio sources. The gate output comprises a plurality of mode signals and is connected to the signal processing circuit. The gate output is responsive to the magnetic field threshold comparator such that detection of the external magnetic field enables one of the plurality of audio source signals to be presented to the signal processing circuit. [0011] In another described embodiment, an integrated circuit may include a sensor for detecting an external magnetic field presence. A magnetic field threshold comparator may include a first input operably connected to a magnetic field threshold value and a second input operably connected to the sensor. The magnetic field threshold comparator further includes an output being adaptable for connecting to a signal processing circuit. The output comprises a first signal and a second signal and is determined in response to the comparison of the sensed external magnetic field and the magnetic field threshold value wherein the first signal is presented to the signal processing circuit when the magnetic field threshold value exceeds the sensed external magnetic field and the second signal is presented to the signal processing circuit when the sensed external magnetic field exceeds the magnetic field threshold value. [0012] Although the following text sets forth a detailed description of numerous different embodiments of the invention, it should be understood that the legal scope of the invention is defined by the words of the claims set forth at the end of this patent. The detailed description is to be construed as exemplary only and does not describe every possible embodiment of the invention because describing every possible embodiment would be impractical, if not impossible. Numerous alternative embodiments could be implemented, using either current technology or technology developed after the filing date of this patent, which would still fall within the scope of the claims defining the invention. Moreover, structure, features and functions of the herein described embodiments should be considered interchangeable, and every structure, feature or function may be used with any of the embodiments herein described. [0013] FIG. 1 depicts an integrated circuit 10, shown in dotted lines, operably disposed between a plurality of audio sources 12 and a signal processing circuit 14. The integrated circuit 10 includes an magnetic field sensor 16 a magnetic field sensor amplifier 17 and a gate 18. The gate 18, preferably a multiplexer, is operably responsive to the output from the magnetic field sensor amplifier 17. The magnetic field sensor 16 may include a threshold comparator 26 wherein detection of a magnetic field is based upon whether the magnetic field strength detected is above or below a threshold level. The threshold level 19 can be fixed or adjustable. The magnetic field sensor amplifier 17 provides an output signal to the gate 18 to ensure desired operation. [0014] The gate 18 includes a plurality of inputs 20 for receiving the outputs of transducers or auxiliary audio sources, e.g., magnetic (telecoil) 12 via coupled magnetic telecoil amplifier 28, acoustic (microphone) 13. [0015] FIG. 2 depicts an alternate embodiment of an integrated circuit 10'. It is to be understood that the present invention may be embodied in these and other configurations. Circuit design preferences, manufacturing constraints, etc., are only a few of the many parameters that may influence whether certain devices, e.g., gate 18, are to be included in the configuration of the integrated circuit. [0016] The integrated circuit 10' includes a magnetic field sensor 16' that integrates therewith the magnetic field sensor 15 and a magnetic filed sensor amplifier 17'. An output of the magnetic field sensor 16' is coupled to a threshold comparator 26 which also couples a threshold value input 19'. The output of the threshold comparator 26 is then coupled to the gate 18. The threshold level again may be fixed or adjustable. FIG. 3. depicts an alternate embodiment of an integrated circuit 10'' including a magnetic field sensor 16'' having a magnetic field sensor 17'', similar to that illustrated in FIG. 2 as integrated circuit 10'. As shown in FIG. 3, signal shaping devices 29, e.g., biasing elements, amplifiers, filters, rectifiers, etc., and other circuit devices may also be incorporated in the design of the integrated circuit 10''. [0017] Any of the embodiments of the integrated circuit 10, 10' and 10'' may further include a manual override 24, which allows one or more than one of the plurality of inputs 20 to be manually selected and presented to the signal processing circuit 14. [0018] Several techniques may be utilized to detect the presence of the external magnetic field--often referred to as a B-field--for the control of the gate 18, e.g., microphone-telecoil multiplexer (MT MUX) in presenting a signal to the signal processing circuit 14. Some B-field detection methods include, but are not limited to: [0019] detection of a static B-field above or below a certain threshold level (the detection level can be hysteretic to guard against oscillatory behavior); [0020] detection of the AC EMF generated by the telecoil when merely bringing the telephone handset into close proximity of the telecoil; [0021] detection of the AC EMF generated by the telecoil in response to the audio signal transmitted by a telephone handset or a room loop; or, [0022] any combination of the above. [0023] The static B-field detection method may be preferred because it is more robust in the presence of electromagnetic interference (EMI)--either environmental or man-made. The other external B-field detection methods are susceptible to "false" B-field detection from EMI, which may result in an undesirable transducer mode selection change that would require user intervention to correct. Although all three detection methods may initially respond unfavorably to EMI, the first method is capable of automatically reverting back to proper transducer mode operation without user intervention once the EMI event has subsided. Continue reading about Magnetic sensor for a transducer... Full patent description for Magnetic sensor for a transducer Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Magnetic sensor for a transducer patent application. ###  How KEYWORD MONITOR works... a FREE service from FreshPatents1. Sign up (takes 30 seconds). 2. Fill in the keywords to be monitored. 3. Each week you receive an email with patent applications related to your keywords. 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