The processing of audio signals is shown in which a first gain-adjustable amplifier is configured to receive a feed forward signal from an input and a second gain-adjustable amplifier is configured to receive a feedback signal from an output. A gain controller supplies a first gain control signal to the first gain-adjustable amplifier, wherein the gain controller supplies a complementary second gain control signal to the second gain-adjustable amplifier, which may be the reciprocal of the first gain control signal. A first combiner is arranged to combine a first output from the first gain-adjustable amplifier with a second output from the second gain-adjustable amplifier. A plurality of filter elements are configured in parallel, wherein each filter element receives an output from the first combiner. A second combiner combines outputs from the filter elements with the original input signal and the filter elements have mutually different filtering characteristic.

A novel phantom-powered inline preamplifier is configured to provide selective processing of a sound source signal by intelligently determining the need for a low or high impedance matching and transformer coupling, based on high fidelity requirements of a particular sound source signal. For example, the phantom-powered inline preamplifier can intelligently detect a microphone-originating sound source signal and automatically route the microphone-originating sound source signal to a low impedance matching circuit pathway that leads to a phantom-powered output terminal for an optimal hi-fidelity processing specific to the microphone-originating sound source signal. Likewise, the phantom-powered inline preamplifier can intelligently detect a musical instrument-originating sound source signal and automatically route the musical instrument-originating sound source signal to a high impedance matching circuit pathway and optionally couple to an instrument transformer, which leads to the phantom-powered output terminal for an optimal hi-fidelity processing specific to the musical instrument-originating sound source signal.

Apparatus and methods for audio amplification devices are provided herein. In certain configurations, an audio amplification device includes a device body, at least one speaker, an electrical system housed in the device body, and one or more light elements integrated into the device body. The electrical system is configured to control an output of sound to the at least one speaker. Additionally, the electrical system controls the one or more light elements, such as by controlling light intensity, flashing rate, and/or color, to thereby enhance safety to the user.

Apparatus and methods for audio amplification devices are provided herein. In certain configurations, an audio amplification device includes a device body, at least one speaker, an electrical system housed in the device body, and one or more light elements integrated into the device body. The electrical system is configured to control an output of sound to the at least one speaker. Additionally, the electrical system controls the one or more light elements, such as by controlling light intensity, flashing rate, and/or color, to thereby enhance safety to the user.

A parameter setting device includes an operator, a scale, a receptor, and a controller. The operator receives parameter changing operation from a user. The scale indicates a reference position of the operator. The receptor receives instructions of turning on a calibration mode. The controller moves the operator to the reference position, when receiving the instructions of turning on the calibration mode.

A parameter setting device includes an operator, a scale, a receptor, and a controller. The operator receives parameter changing operation from a user. The scale indicates a reference position of the operator. The receptor receives instructions of turning on a calibration mode. The controller moves the operator to the reference position, when receiving the instructions of turning on the calibration mode.

Apparatus and methods for audio amplification devices are provided herein. In certain configurations, an audio amplification device includes a device body, at least one speaker, an electrical system housed in the device body, and one or more light elements integrated into the device body. The electrical system is configured to control an output of sound to the at least one speaker. Additionally, the electrical system controls the one or more light elements, such as by controlling light intensity, flashing rate, and/or color, to thereby enhance safety to the user.

The present invention is an electrical box cover system and method of installation that covers and protects existing electrical boxes and their electrical components. This invention prevents corrosion and the resulting damage to the mechanical and electrical components of the electrical box while ensuring the electrical box is safe to open and allowing access to the inside of the electrical box. The electrical box cover system includes a cover, fasteners, and a gasket. Generally, to install the cover, the fasteners are drilled through the cover and onto the sides of the damaged electrical box with the gasket, which is placed in the cover.

A radiofrequency device operates in a reader mode, in a tag detection mode, and in a card emulation mode. The device includes a first mixer, a second mixer, a gain controllable amplifier and a third mixer. In the reader and tag detection modes, the first mixer mixes a received radiofrequency signal with a first periodic signal having a frequency equal to a frequency of a carrier of the received radiofrequency signal, and the second mixer mixes the received radiofrequency signal with a second periodic signal having a frequency equal to the frequency of the carrier and being in quadrature with first periodic signal. In the card emulation mode, the gain controllable amplifier amplifies the received radiofrequency signal, and the third mixer mixes the amplified signal with itself.

A radiofrequency device operates in a reader mode, in a tag detection mode, and in a card emulation mode. The device includes a first mixer, a second mixer, a gain controllable amplifier and a third mixer. In the reader and tag detection modes, the first mixer mixes a received radiofrequency signal with a first periodic signal having a frequency equal to a frequency of a carrier of the received radiofrequency signal, and the second mixer mixes the received radiofrequency signal with a second periodic signal having a frequency equal to the frequency of the carrier and being in quadrature with first periodic signal. In the card emulation mode, the gain controllable amplifier amplifies the received radiofrequency signal, and the third mixer mixes the amplified signal with itself.