According to a first aspect of the embodiments, a microphone mixer is provided comprising: an input adapted to receive differential microphone (mic) output signals; a gain-trim circuit adapted to receive the differential mic output signals, and which includes a substantially fully differential amplifier adapted to amplify the received differential mic output signals through use of a gain-trim output adjustment device that provides a variable gain amount ranging from a first gain-trim gain value to a second gain-trim gain value, to produce differential gain-trim circuit output signals; a fader circuit adapted to receive the differential gain-trim circuit output signals, and which includes a differential amplifier adapted to attenuate the received differential gain-trim circuit output signals through use of a fader output adjustment device that provides a variable gain amount ranging from a first fader gain value to a second fader value; and a common adjustment apparatus that mechanically ties the gain-trim output adjustment device with the fader output adjustment device such that the first gain-trim gain value and first fader gain value are obtained substantially simultaneously at a first position of the common adjustment apparatus, and the second gain-trim gain value and second fader gain value are obtained substantially simultaneously at a second position of the common adjustment apparatus.

A sound processing system operative to measure the level of diffusivity of the sounds present in the input sound signal. The system includes a plurality of input channels for receiving audio signals from an audio scene, the audio scene comprising at least one target sound in the presence of background noise. A diffusivity measurement unit is included so as to be operably coupled to the plurality of input channels to receive the audio signals therefrom and measure a level of diffusivity of the sounds present therein. A leveler unit is operably coupled to the plurality of input channels for receiving the audio signals therefrom and for applying a gain to the audio signals to minimize variations in the audio signal levels. A controller is operably coupled to the diffusivity measurement unit and the leveler unit to control the gain applied to the audio signals by the leveler unit based on the level of diffusivity of the sounds present therein.

The present exemplary embodiments provide an audio signal muting apparatus and a digital signal conversion apparatus which remove a negative pop noise in a predetermined large range using a negative power for the transistor of the audio signal muting apparatus.

A noise squelch processor generates a noise squelch determination signal by comparing a noise level and a threshold value with each other. A carrier detector generates a carrier determination signal indicating whether or not a reception signal is present based on a signal strength of the reception signal. An integrator controller controls an integrator to set a cutoff frequency of the integrator to a second cutoff frequency higher than a first cutoff frequency at a first timing when the carrier detector generates a carrier determination signal indicating that the reception signal is present, and to switch the cutoff frequency of the integrator from the second cutoff frequency to the first cutoff frequency at a second timing after an elapse of a predetermined period from the first timing.

Systems and methods to process a digital audio broadcast signal having a plurality of digital audio signals can be implemented in a variety of applications. The digital audio broadcast signal having a main program service and a set of supplemental program services can be received at a digital audio system and processed to provide an audio signal to a set of speakers. The processing can include calculation of audio levels of audio signals of the main program service and the supplemental program services. One of the services can be selected with the audio signal of the selected service adjusted based on the calculated level of the selected service and a reference signal, prior to sending the audio signal to the set of speakers. In various embodiments, the reference signal can be an analog audio signal in the digital audio broadcast signal. Additional apparatus, systems, and methods are disclosed.

According to a first aspect of the embodiments, a microphone mixer is provided comprising: an input adapted to receive differential microphone (mic) output signals; a gain-trim circuit adapted to receive the differential mic output signals, and which includes a substantially fully differential amplifier adapted to amplify the received differential mic output signals through use of a gain-trim output adjustment device that provides a variable gain amount ranging from a first gain-trim gain value to a second gain-trim gain value, to produce differential gain-trim circuit output signals; a fader circuit adapted to receive the differential gain-trim circuit output signals, and which includes a differential amplifier adapted to attenuate the received differential gain-trim circuit output signals through use of a fader output adjustment device that provides a variable gain amount ranging from a first fader gain value to a second fader value; and a common adjustment apparatus that mechanically ties the gain-trim output adjustment device with the fader output adjustment device such that the first gain-trim gain value and first fader gain value are obtained substantially simultaneously at a first position of the common adjustment apparatus, and the second gain-trim gain value and second fader gain value are obtained substantially simultaneously at a second position of the common adjustment apparatus.

Systems and methods for dynamically adjusting transmit gain in a transceiver. The gain is adjusted in order to provide the maximum gain. The amount of distortion is measured. The gain is increased until the distortion reaches a predetermined limit. The gain of several components can be adjusted independently.

Systems and methods for dynamically adjusting transmit gain in a transceiver. The gain is adjusted in order to provide the maximum gain. The amount of distortion is measured. The gain is increased until the distortion reaches a predetermined limit. The gain of several components can be adjusted independently.

According to a first aspect of the embodiments, a microphone mixer is provided comprising: an input adapted to receive differential microphone (mic) output signals; a gain-trim circuit adapted to receive the differential mic output signals, and which includes a substantially fully differential amplifier adapted to amplify the received differential mic output signals through use of a gain-trim output adjustment device that provides a variable gain amount ranging from a first gain-trim gain value to a second gain-trim gain value, to produce differential gain-trim circuit output signals; a fader circuit adapted to receive the differential gain-trim circuit output signals, and which includes a differential amplifier adapted to attenuate the received differential gain-trim circuit output signals through use of a fader output adjustment device that provides a variable gain amount ranging from a first fader gain value to a second fader value; and a common adjustment apparatus that mechanically ties the gain-trim output adjustment device with the fader output adjustment device such that the first gain-trim gain value and first fader gain value are obtained substantially simultaneously at a first position of the common adjustment apparatus, and the second gain-trim gain value and second fader gain value are obtained substantially simultaneously at a second position of the common adjustment apparatus.

A wireless receiver includes an RF muting circuit that opens and closes a signal line of a demodulated signal according to a received carrier strength level, a noise muting circuit that opens and closes the signal line according to a noise level in the modulated signal, and an RF attenuation circuit that attenuates a RF signal handled in a RF amplifier circuit, and additionally includes a reception mode switching circuit which can simultaneously select at least any two values from those comprising one of a plurality of predetermined threshold values of the RF muting circuit, one of a plurality of predetermined threshold values of the noise muting circuit and one of a plurality of predetermined amount of attenuation of the RF attenuation circuits. This configuration allows to provide a wireless receiver having a stable reception characteristics without sound interruption or interferences in a multi-wave operation of wireless microphones.