Each input channel adjusts a level of an audio signal by individual first parameters and outputs the level-adjusted audio signals to individual output routes that include bus channels. Each bus channel mixes the level-adjusted audio signals and processes the mixed audio signal by a second parameter to output to a main output. A preview channel adjusts a level of the audio signal of each of input channels by a third parameter, mixes the level-adjusted audio signals of the input channels and processes the mixed audio signal by a fourth parameter to output to a monitor output. In response to a preview instruction, the first parameter of the input channel is copied as the third parameter, and the second parameter of the bus channel is copied as the fourth parameter of the preview channel. In response to an adjustment instruction, the third or fourth parameter of the preview channel is changed.

An configuration method of audio equipment includes, a first step of preparing a plurality of configuration data sets; a second step of receiving, from a user, selection of one output configuration from among a plurality of output configurations; a third step of receiving, from the user, selection of one input configuration from among input configurations restricted by the selected one output configuration; a fourth step of selecting one amplifier mode from among a plurality of amplifier modes based on the selected one output configuration and the selected one input configuration; and a fifth step of selecting a configuration data set corresponding to the selected one amplifier mode, and applying the selected configuration data set to signal processing to be performed by the signal processor.

A system may include an input configured to receive a first signal representative of a second signal to be driven to an amplifier input of an amplifier, processing circuitry configured to process the first signal in order to generate the second signal from the first signal such that the processing circuitry limits a current driven by the amplifier to an output load of the amplifier, and an output configured to drive the second signal to the amplifier input.

There is provided an apparatus for providing an output signal to an audio transducer, comprising: a first signal path for receiving a first digital audio input signal, applying a first digital gain, and outputting an amplified first digital audio input signal; a second signal path, for receiving a second digital audio input signal, applying a second digital gain, and outputting an amplified second digital audio input signal; converter circuitry, coupled to the first and second signal paths, for converting at least the amplified first and second digital audio input signals into the analogue domain, and outputting an analogue audio input signal; and an analogue gain element, for applying an analogue gain to the analogue audio input signal and outputting the output signal. The apparatus further comprises a control circuit, coupled to the first and second signal paths, operative to select the analogue gain based on a combination of at least the first and second digital audio input signals or signals derived therefrom, and to select the first and second digital gains so as to compensate for the analogue gain.

An audio processing system includes a server complex in communication with a network. The server complex receives a digital audio file and one or more analog domain control settings from a client device across the network. A digital-to-analog converter converts the digital audio file to an analog signal. One or more analog signal processors apply at least one analog modification to the analog signal in accordance with the one or more analog domain control settings. An analog-to-digital converter converts the modified analog signal to a modified digital audio file. The server complex can then deliver the modified digital audio file to the client device across the network.

Systems and methods presented herein may provide for processing audio with increased loudness and dynamics. A first clock frequency associated with a digital audio file may be increased to a second clock frequency, which speeds up the playback of the audio. The digital audio file may then be converted to analog at the higher second frequency, where it is further modified in the analog domain. The analog audio is then converted back into digital audio at the second clock frequency. The clock frequency is then decreased back to the first clock frequency for playback or storage of the processed (i.e., modified or manipulated) digital audio file. Alternatively, the entire process can take place in the digital domain.

Audio information of audio content being listened to by a user is received. An aspect of a listening environment of the user is identified. A volume preset, based on the audio information and the aspect of the listening environment, is determined to be available. A first volume of the audio content being listened to by the user is determined to be different from the volume preset. The first volume of the audio content is adjusted to a second volume.

A method for processing an audio signal includes setting target loudness; receiving metadata of an audio signal from a server; and adjusting the loudness of the audio signal by using the received metadata, so that the loudness of the audio signal corresponds to the set target loudness.

A system and method for digital processing including a gain element to process an input audio signal, a high pass filter to then filter the signal and create a high pass signal, a first filter module to filter the high pass signal and create a first filtered signal and a splitter to split the high pass signal into two high pass signals. The first filter module filters one high pass signals before a first compressor modulates the signal or a high pass signal to create a modulated signal. A second filter module filters the modulated signal to create a second filtered signal that is processed by a first processing module including a band splitter that splits the signal into low and high band signals that are then modulated by compressors. A second processing module processes the modulated low and high band signals to create an output signal.

A DC-DC converter for implantable medical devices includes a switch capacitor converter core including a plurality of power transistor switches configured to receive an input voltage and output an output voltage; a switch driver connected with the switch capacitor converter core and configured to turn on corresponding power transistor switches in the switch capacitor converter core so as to supply power to a load receiving the output voltage; a switch signal router connected with the switch driver and configured to selectively transmit signals required by the switch driver; a gain selection decoder connected with the switch signal router; a gain controller connected with the gain selection decoder, the gain selection decoder being configured to decode gain selection instructions transmitted from the gain controller; an input adjusting device connected with the gain controller and configured to receive the input voltage and a reference voltage, to indicate relationship between the input voltage and the reference voltage, and to transmit the relationship to the gain controller; an output adjusting device connected with the gain controller and configured to receive the output voltage and the reference voltage, to indicate relationship between the output voltage and the reference voltage, and to transmit the relationship to the gain controller; a clock generator connected with the switch signal router, the gain controller and the output adjusting device; and a counter connected with the gain controller.