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| Number | Title | Issue Date |
| 7117010 | Wireless phone powered inductive loopset An induction-type loopset is provided that is connectable to a wireless device. The loopset contains a first coil electromagnetically coupled to a t-coil hearing aid and an impedance-matching device coupled to the first coil. The impedance-matching device is respons... | 10/03/2006 |
| 6974906 | low interferance cable A signal cable lead structure in which each lead inside the cable is formed in a generally rectangular shape such that current passing through each segment of the lead is traveling in the opposite direction from current passing through an adjacent segment of the sam... | 12/13/2005 |
| 6911880 | Transmission line type noise filter with small size and simple structure, having excellent noise removing characteristic over wide band including high frequency band A noise filter (1) has a first impedance element (2) having an impedance value Z1, a second impedance element (3) having an impedance value Z2, a third impedance element (4) having an impedance value Z3, a first anode... | 06/28/2005 |
| 6584203 | Second-order adaptive differential microphone array A second-order adaptive differential microphone array (ADMA) has two first-order elements (e.g., 802 and 804 of FIG. 8), each configured to convert a received audio signal into an electrical signal. The ADMA also has (i) two delay nodes (e.g., 806 and 808... | 06/24/2003 |
| 6516067 | Anti pop for power off In order to quickly decrease voltage applied to a mute pin 18 of an audio amplifier circuit 19 of an electronic appliance, an end of a capacitor 20 connected to the mute pin is connected to a discharge circuit which is fired on when the electronic applian... | 02/04/2003 |
| 6473510 | AC power source filter for audio video electrical load A filter for suppressing noise surges and noise frequencies in ac power lines to an audio video load includes at least one noise suppression circuit. The noise suppression circuit in turn includes first and second inductors coupled to respective power lin... | 10/29/2002 |
| 5822441 | Power amplifier/loudspeaker interface A method for supplying power to a hi-fi loudspeaker unit comprising a speaker (Hp) supplied via a conductor (LA) connected to a positive pole of an amplifier, and a conductor (LR) connected to a negative pole thereof , and at least one filter mounted in p... | 10/13/1998 |
| 5796853 | Speaker and amplifier system A high fidelity system is provided that employs a speaker and amplifier arrangement. The amplifier is separated into a pre-amplifier and at least one audio current amplifier sections. The connections between the pre-amplifier and the audio current amplifi... | 08/18/1998 |
| 5751823 | Audio amplifier system with improved isolation between preamplifier and power amplifier An audio amplifier, particularly suited for automotive applications, providing improved isolation between the preamplifier section and the power amplifier section. The preamplifier section ground is isolated from the power amplifier section ground. The am... | 05/12/1998 |
| 5517572 | Methods and apparatus for connecting and conditioning audio signals Audio signal connection and conditioning circuitry employs a resistive drop across the ground input for the signal source to generate a common mode voltage on both input lines. A differential amplifier subtracts the generated common mode voltage on the gr... | 05/14/1996 |
| 5473702 | Adaptive noise canceller An adaptive filter estimates the noise component in a primary audio signal by convolving a secondary audio signal with a set of coefficients. The estimated noise component is subtracted from the primary audio signal to produce an output signal. During ste... | 12/05/1995 |
| 5222149 | Damping terminator for high fidelity audio signals In audio frequency high fidelity equipment, termination plugs for input ports and output ports of various types wherein the termination plugs include a conductive-film-covered ferromagnetic-core electrical damping element inductively coupled to potential ... | 06/22/1993 |
| 5170081 | Ground isolation circuit The present invention relates to a ground isolation circuit for use in connecting electronic circuits at the pre-stage and the post-stage having signal lines assigned for a plurality of channels, wherein the interconnection of the two electronic circuits ... | 12/08/1992 |
| 5146506 | Isolator circuit for an audio system An isolator circuit for an audio system has an operational amplifier provided between a signal source and an amplifier. A capacitor and a resistor connected in series are connected between each input of the operational amplifier and the signal source. A b... | 09/08/1992 |
| 5043686 | Adaptive power line noise filter and switch for audio reproduction equipment A filter circuit for reducing power line noise to audio reproduction equipment. Audio reproduction equipment requires a power source without excessive line noise; however, power sources, particularly in the automotive environment, often generate a substan... | 08/27/1991 |
| 5033091 | Cable interconnection for audio component system A cable interconnection for an audio component system includes a first cable and a second cable. The first cable has a pair of first conductors, each of the first conductors are adapted to make an electrical connection between a source positive terminal a... | 07/16/1991 |
| 4979218 | Balanced output circuit An electronic output transformer permits elimination of hum and other ground loop interference from audio signals transmitted between separated pieces of equipment. The transformer has a balanced differential output and feedback circuits which force the d... | 12/18/1990 |
| 4804904 | Voltage to current converters for use in an active filter and with a moise reduction circuit The invention relates to a voltage to current converter suited for integration. The voltage to current converter combines the outputs of two voltage to current converting circuits whose operating input levels are different from each other so as to prevent... | 02/14/1989 |
| 4725789 | Circuit arrangement for a low-noise audio frequency source A circuit arrangement for coupling alternating voltage signals having frequencies within the audio frequency range between a low noise audio frequency source and a zero ohm amplifier, wherein the audio frequency source has a known source impedance. The ci... | 02/16/1988 |
| 4637050 | Method and apparatus for suppressing interference in a signal, in particular an audio signal For suppressing interference in an audio signal comprising a useful signal component and an interference signal component in the method according to the invention firstly the original audio signal is sampled and digitally recorded. At the same time the le... | 01/13/1987 |
