46 results about "Phantom power" patented technology

The invention is directed to techniques for discovering a powerability condition of a computer network such as the existence of a remotely powerable device attached to a connecting medium of the computer network. Such detection can then control whether a remote power source (e.g., a data communications device such as a switch) provides remote power (e.g., phantom power) to the computer network. One arrangement of the invention is directed to an apparatus for discovering a powerability condition of a computer network. The apparatus includes a signal generator, a detector and a controller which is coupled to the signal generator and the detector. The controller configures the signal generator to provide a test signal to a connecting medium of the computer network, and configures the detector to measure a response signal from the connecting medium of the computer network. The controller then indicates whether a remotely powerable device connects to the connecting medium of the computer network based on the response signal. Accordingly, if the apparatus discovers a remotely powerable device attached to the computer network (i.e., the power requirement condition of the network), the apparatus can provide power to the device remotely (e.g., through the connecting medium). However, if the apparatus does not discover a remotely powerable device attached to the computer network (e.g., another power requirement condition), the apparatus can avoid providing power remotely and thus avoid possibly damaging any non-remotely powerable device on the computer network.

The invention discloses a high-power downhole electromagnetic pulse transmission device which comprises a ground instrument and a downhole instrument. The core of the ground instrument is an industrial personal computer and consists of a depth/magnetic mark/global position system (GPS) signal recording module, a Manchester coding and decoding module and a cable driving module; the depth/magnetic mark/GPS signal recording module and the Manchester coding and decoding module are connected with the industrial personal computer respectively through two serial ports; based on the principle of phantom power supply, the cable driving module is connected with the downhole instrument by a cable; the downhole instrument is sequentially provided with an alternating-current boost module, an energy-storage capacitor, a transmitting coil, a data acquisition module, a high-voltage discharging switch and a controller manipulated by a computer; and the ground instrument supplies power to the downhole instrument through the cable. By the high-power downhole electromagnetic pulse transmission device, magnetic field pulse excitation with instantaneous high power can be realized in a cased well, full time-interval data during transmitting wave forms and receiving signals in a well is recorded, and an observation system is provided for a downhole electromagnetic detection method which is used for evaluating and developing the distribution state of remaining oil in an oil storage layer.

A personal microphone that includes a structure having a live-performance form factor, a capsule that converts acoustic energy into an input signal, a signal processor that converts the input signal into a processed output signal, and a microphone output connector. The signal processor has input terminals that receive the input signal and input/output terminals that receive a phantom DC voltage from the microphone output connector while sending the microphone output connector a processed output signal. The signal processor has a dynamic range compressor that compresses the processed output signal, and a programming or adjustment device that sets the signal processor operating parameters. The personal microphone can have a security device for avoiding unwanted changes to the operating parameters of the adjustable signal processor. The personal microphone can be powered by a phantom power supply coupled to the microphone output connector via a mixing console and/or other devices.

Musical instrument effects pedals are powered from adjacent pedals by providing electrical connectors between adjacent pedals and by providing tip-ring-sleeve jacks in the pedals and three wire connectors with tip-ring-sleeve connectors, which carry sound signals from an instrument through sequential pedals and electrical power in an opposite direction to the pedals.

A microphone including a connector with a plurality of electrical contacts. The microphone interfaces with a computer system via a digital bus. The microphone can transmit data to the computer system via the connector that is related to at least one of the following: the microphone manufacturer, the microphone manufacture date, the microphone model number, the microphone serial number, the microphone frequency response, whether the microphone uses phantom power, the desired pre-amplifier gain, and the microphone dynamic response.

The improved microphone with the removable connection to the phantom power supply facilitates the setting and provides elimination of the forgetful operation of switch-off, in e.g. convention center. The microphone provides both of manual and automatic operations of its indicator lamp having indication of the power supply, and has a manual switch which provides a common mode for operation of, and an automatic operation of both of its audio signal output and the indicator lamp. It also has a first circuit by which the indicator lamp automatically lights up, separately from the manual switch, in response to the connection to the power supply; and a second circuit by which the indicator lights out and the audio signal output is turned to off after the elapse of a predetermined time from the connection. The first and second circuits comprise respective integration circuits.

An audio level compressor for compressing the dynamic range of an input audio signal. The audio level compressor can be part of a microphone, or a separate component. The audio level compressor includes input terminals for receiving the input audio signal, a lamp having a filament resistance that is a function of the input audio signal; a load resistance; a signal gain controller that includes a means for increasing dynamic range compression of the input audio signal, and output terminals for providing an output audio signal that is a function of the input audio signal and the signal gain. The signal gain controller provides a signal gain that is a function of the filament resistance and the load resistance. The audio level compressor can also include an expander circuit or a power conditioning circuit. Power can be provided by an internal source or a phantom power supply.

A condenser microphone is obtained, in which the bias of a current amplifier circuit in emitter-follower connection immediately after an impedance converter automatically changes in accordance with the switching of phantom power supply voltages and the maximum output level and the maximum permissible input sound pressure level are increased at any power supply voltage. The condenser microphone comprising a transistor Q2 in emitter-follower connection immediately after an FET 2 that constitutes an impedance converter Q1 has a constant current diode D2 connected to an output transformer TRS that also serves as a transformer for phantom power source supply and resistors R0 and R1 that divide the voltage on the cathode side of the constant current diode D2 into a bias voltage that causes the transistor Q2 to operate.

The present invention provides a low noise phantom powered capacitor microphone and a method of using a vacuum tube as an impedance converter of the microphone capsule in the capacitor microphone with no exclusive power supply.

In the phantom powered capacitor microphone of which a vacuum tube V01 is used as the impedance converter, a part of the voltage supplied from the phantom power supply is converted to a predetermined voltage by one or more switched capacitor voltage converters, for example, by three switched capacitor voltage converters IC01, IC02 and IC03 seriously connected as three stages to obtain the heater voltage of the vacuum tube V01.

Novel active phantom-powered ribbon microphones that provide switchable proximity effect response filtering for voice and music applications are disclosed with unique adjustable interfaces. In one embodiment of the invention, a slider-based full frequency response vs. low frequency response and high pass filtering adjustment interface on a surface of a microphone casing provides a convenient switching between a “Music” mode and a “Voice” mode, wherein the “Voice” mode reduces the undesirable proximity effect in an active phantom-powered ribbon microphone, when a sound source is situated overly close to the active phantom-powered ribbon microphone. Furthermore, in one embodiment of the invention, a slider-based or a knob-based variable voice mode adjustment interface can also be integrated on a surface of a microphone casing to provide various preset levels of low frequency reduction and/or proximity effect response filtering when the “Voice” mode is enabled.

A novel ribbon microphone incorporates rounded-edge magnet motor assembly, a backwave chamber, and a phantom-powered JFET circuit. In one embodiment of the invention, one or more novel rounded-edge magnets may be placed close to a ribbon of the ribbon microphone, wherein the one or more novel rounded-edge magnets reduce or minimize reflected sound wave interferences with the vibration of the ribbon during an operation of the ribbon microphone. Furthermore, in one embodiment of the invention, a novel backwave chamber operatively connected to a backside of the ribbon can minimize acoustic pressure, anomalies in frequency responses, and undesirable phase cancellation and doubling effects. Moreover, in one embodiment of the invention, a novel phantom-powered JFET preamplifier gain circuit can minimize undesirable sound distortions and reduce the cost of producing a conventional preamplifier gain circuit.

Phantom-powered inline preamplifiers capable of variable impedance loading are disclosed with unique adjustable interfaces. By enabling a user to adjust impedance loading from an actively-powered audio preamplifier which takes a microphone electrical signal or another sound source signal as an input, this unique audio preamplifier design with various adjustable impedance loading interface configurations can change sound characteristics according to the user's preference in a recording, production, or live concert environment. In addition, a high pass filter incorporated in a preamplifier with the variable impedance loading feature allows the user to further customize sound characteristics in the recording environment. This novel inline preamplifier, which may be standalone or integrated into a microphone casing, is powered via a microphone cable from a component (e.g. another preamplifier) providing the phantom power. This inline preamplifier may be connected to a conventional microphone and receive phantom-power into the inline preamplifier from a conventional preamplifier.

Current-mode transmission is implemented in a cascode amplifier by splitting a cascode circuit into a front end and a back end to ensure wideband current-mode transmission of an audio signal. A transmission cable is located between the high impedance output of the first end and the low impedance input of the back end. The front end includes a first amplifying device, and the back end includes a second amplifying device. The front end is phantom powered by the back end using the same electrical conductors that carry the current-mode signal over the transmission cable.

An energy efficient appliance is switched off completely from a main power supply when it is not in operation to deliver designed functionalities. An auxiliary power supply is employed to provide power for receiving restarting signal from a remote control device. In one embodiment, the auxiliary power supply receives power wirelessly from the remote control device to switch on the main power supply. In another embodiment, the auxiliary power supply receives power by harvesting energy available in environment. In still another embodiment, the auxiliary power supply is a replaceable or rechargeable battery. The appliance includes televisions, digital video recorders, air conditioners, lighting systems, audio systems and microwave ovens. The appliance may also include a door open system for a home or for an automobile.

To provide electromagnetic damping without a special output connector for protecting a diaphragm of metallic ribbon foil of a ribbon microphone against shocks. A ribbon microphone operable with a phantom power supply comprises: an acoustic-electric converter 1 including a pair of permanent magnets and a diaphragm of metallic ribbon foil; and a step-up transformer 110 coupled with the diaphragm on a primary winding 111 side and having, on a secondary winding 112 side, an output connector 120 removably connected to a phantom power supply, the step-up transformer 110 increasing a voltage generated by the diaphragm to a predetermined voltage, the voltage then being output to the phantom power supply side through the output connector 120, wherein a switch 141 is connected across the secondary winding 112, the switch 141 being normally closed and being opened by a power supplied from the phantom power supply.

Provided is a digital microphone having a power supply. In this case the power supply is configured so as to provide a P48 V phantom power.

A phantom power circuit has a detection circuit and a limiting circuit, the detection circuit detecting a pulse current generated in association with connection or disconnection of a condenser microphone, the limiting circuit limiting the output of the condenser microphone. The detection circuit detects a pulse current generated between input terminals of the condenser microphone. The limiting circuit reduces the output from the condenser microphone when the detection circuit detects the pulse current.