A hybrid audio processing system that includes a housing, an audio amplification unit, and one or more speakers. The housing has a cover member and a body member, the cover member pivotally coupled to the body member, wherein the body member has a void dimensioned and shaped to encase a musical instrument. The audio amplification unit is configured to amplify signals received from the musical instrument, the amplification unit housed within the housing, wherein one or more controls for the audio amplification unit are coupled to an outer surface of the housing. The one or more speakers can be mounted in a wall of the body member, wherein the one or more speakers are operably coupled to the audio amplification unit.

Methods and systems for generating oscillatory timbres for musical synthesis through synchronous ring modulation are described. An example method performing hard synchronization comprising using first and second oscillators, the first oscillator being a fundamental oscillator which provides a fundamental frequency, the second oscillator being a modulation oscillator operable at a frequencies higher than the first oscillator; and in response to the fundamental oscillator completing its cycle, synchronizing the modulation oscillator to the original point of its waveform. Ring modulation may be performed on the synchronized output by multiplying it by a waveform of the fundamental oscillator, such that the ring modulation is synchronized to produce a variety of oscillatory timbres. The method can create a variety of unique sounds having musically pleasing characteristics. A real-time audio signal can be used instead of the first oscillator to produce dynamically varying timbres.

A musical sound generation device includes a control device which, when a performance operator among a plurality of performance operators has been operated for a part that has been set to sound a predetermined number of simulated voices of an analog synthesizer, assigns a sounding parameter of one or two or more voices, which form a timbre of a simulated voice of the analog synthesizer corresponding to the operated performance operator and are selected from a plurality of sounding voices, to a sound generation circuit, and assigns, to the sound generation circuit, an information set selected from a plurality of information sets and each include a variation value that applies a variation to the sounding parameter of the one or two or more voices, and a sound generation circuit that performs a sounding process of the one or two or more voices using the sounding parameter and the information set.

A sound generating analog synthesizer that is comprised of potentiometers, a switch or switches and a set of patch jacks has a control system that can be operated in three modes, a manual mode, an automatic mode, and a guided mode; wherein manual mode allows potentiometer and switch positions as well as patch cable connections to be set by hand; wherein automatic mode, automatically sets patch connections as on or off, as well as set potentiometer positions and switch states with electromechanical or electrical devices; and wherein the guided mode provides at least one visual information on how to change the potentiometer positions, switch states, and patch jack connections such that a previously obtained sound can be reproduced.

Methods and systems for generating oscillatory timbres for musical synthesis through synchronous ring modulation are described. An example method performing hard synchronization comprising using first and second oscillators, the first oscillator being a fundamental oscillator which provides a fundamental frequency, the second oscillator being a modulation oscillator operable at a frequencies higher than the first oscillator; and in response to the fundamental oscillator completing its cycle, synchronizing the modulation oscillator to the original point of its waveform. Ring modulation may be performed on the synchronized output by multiplying it by a waveform of the fundamental oscillator, such that the ring modulation is synchronized to produce a variety of oscillatory timbres. The method can create a variety of unique sounds having musically pleasing characteristics. A real-time audio signal can be used instead of the first oscillator to produce dynamically varying timbres.

Methods and digital circuits provide frequency correction to frequency synthesizers. Dual switched-capacitor voltage detectors connected to an input signal periodically sample the voltage of the input signal, and then determine a fundamental frequency of the input signal from the output of the dual switched-capacitor voltage detectors. The sample period of the dual switched-capacitor voltage detectors is proportional to a time period between a previous pair of voltage peaks detected in the input signal, thereby eliminating harmonic components in the original signal which might otherwise cause errors in frequency estimation without causing unwanted sluggishness in the transient response of the frequency detection process. The time period between the previous pair of detected voltage peaks is used to create a decay signal that initiates a capacitor decay time for each voltage detector. Two additional digital methods of extracting the fundamental frequency as well as an envelope of an analog audio signal are also described, one utilizing a sliding sample rate, and the other utilizing a fixed sample rate, for processing. These methods expand the array of techniques available for detecting the fundamental frequency of an arbitrary monophonic audio signal within one cycle making it possible to implement the disclosed methods on a much wider array of platforms, including but not limited to microcontrollers, digital signal processors (DSP), microprocessors, software running in desktop PCs, and software running in mobile applications.

Methods and digital circuits providing frequency correction to frequency synthesizers are disclosed. Dual switched-capacitor peak detectors connected to an input signal periodically sample the voltage of the input signal, and then determine a fundamental frequency of the input signal from the output of the dual switched-capacitor peak detectors. Both the sample period and the decay time of the dual switched-capacitor peak detectors are proportional to a time period between a previous pair of voltage peaks detected in the input signal. This makes the peak detectors immune to lower-amplitude oscillations which are often present within a single fundamental cycle in musical signals with strong harmonic components which might otherwise cause errors in frequency estimation. This is done without causing unwanted sluggishness in the transient response of the frequency detection process. The time period between the previous pair of detected voltage peaks is used to create a decay signal that initiates a capacitor decay time for each peak detector.

[Technical problem] Circulatory sound regulation that changes environmental sound into input sound, converted sound with arbitrarily regulatory frequency component, arbitrarily regulatory amplitude or both of them, output sound, another input sound synthesized with this output sound and an environmental sound, and another converted sound made from this input sound. [Solution] Apparatus comprising: input means that receives environmental sound from arbitrary environment as an input sound; conversion means that converts the input sound into a converted sound that contains arbitrarily regulatory frequency component including frequency component that approximates to principle oscillator, arbitrarily regulatory amplitude or both; and output means that transmits the converted sound to environment as an output sound; whereby the input means receives synthetic sound synthesized with the output sound and environmental sound as an input sound again, and the conversion means converts this input sound further into another converted sound.

A sound generating analog synthesizer that is comprised of potentiometers, a switch or switches and a set of patch jacks has a control system that can be operated in three modes, a manual mode, an automatic mode, and a guided mode; wherein manual mode allows potentiometer and switch positions as well as patch cable connections to be set by hand; wherein automatic mode, automatically sets patch connections as on or off, as well as set potentiometer positions and switch states with electromechanical or electrical devices; and wherein the guided mode provides at least one visual information on how to change the potentiometer positions, switch states, and patch jack connections such that a previously obtained sound can be reproduced.

A sound generating analog synthesizer that is comprised of potentiometers, a switch or switches and a set of patch jacks has a control system that can be operated in three modes, a manual mode, an automatic mode, and a guided mode; wherein manual mode allows potentiometer and switch positions as well as patch cable connections to be set by hand; wherein automatic mode, automatically sets patch connections as on or off, as well as set potentiometer positions and switch states with electromechanical or electrical devices; and wherein the guided mode provides at least one visual information on how to change the potentiometer positions, switch states and patch jack connections such that a previously obtained sound can be reproduced.