Abstract:
An electronic signal processor for processing signals includes a complex first filter, one or more gain stages and a second filter. The first filter is characterized by a frequency response curve that includes multiple corner frequencies, with some corner frequencies being user selectable. The first filter also has at least two user-preset gain levels which may be alternately selected by a switch. Lower frequency signals are processed by the first filter with at least 12 db/octave slope, and preferably with 18 db/octave slope to minimize intermodulation distortion products by subsequent amplification in the gain stages. A second filter provides further filtering and amplitude control. The signal processor is particularly suited for processing audio frequency signals. Related methods include filtering the input signal with an input filter of the second or third order high pass type, amplifying the filtered signal and further filtering the amplified signal with a low pass filter, which may be of the second order type.
Abstract:
An electronic signal processor for processing signals includes a complex first filter, one or more gain stages and a second filter. The first filter is characterized by a frequency response curve that includes multiple corner frequencies, with some corner frequencies being user selectable. The first filter also has at least two user-preset gain levels which may be alternately selected by a switch. Lower frequency signals are processed by the first filter with at least 12 db/octave slope, and preferably with 18 db/octave slope to minimize intermodulation distortion products by subsequent amplification in the gain stages. A second filter provides further filtering and amplitude control. The signal processor is particularly suited for processing audio frequency signals. Related methods include filtering the input signal with an input filter of the second or third order high pass type, amplifying the filtered signal and further filtering the amplified signal with a low pass filter, which may be of the second order type.
Abstract:
A method for use with a musical instrument includes receiving a signal representative of a sound produced by the musical instrument, receiving a selection of an audio effect from a wireless controller, applying the audio effect to the signal representative of a sound produced by the musical instrument, and providing an output signal representative of the audio effect applied to the sound produced by the musical instrument. Other methods include causing an image to be responsive to a signal representative of motions of the musical instrument, and causing an image to be responsive to a signal representative of sound produced by the musical instrument. A computer readable storage medium may store a computer program adapted to cause a processor based system to execute the steps of any one or more of these methods.
Abstract:
Methods are provided for solid-state implementation of a vacuum tube replacement device that supplements the functional performance of the target replacement device, i.e., a traditional glass vacuum tube. Example functions may include OEM or user adjustable parameters such as gain and/or frequency response (e.g. transfer function), current and/or voltage saturation thresholds, bias condition, input and/or output impedance, linear-to-non-linear transfer function(s) (e.g. soft clipping parameters), power dissipation, communication protocols, and audio/visual indication parameters such as signal limiting detection, safety, stress, or wear-out conditions, and tube emulation model type to name a few. The methods presented for the vacuum tube replacement device system(s) are equally useful for non-vacuum tube systems such as audio amplifier circuits.
Abstract:
The following components are connected in parallel: a capacitor, a resistor and a diode. In a typical application, to one end of the combination one may connect the signal from an electric guitar's pickup. The other end of the combination is connected to the input of a guitar amp, generally a transistor (solid-state) amp which it is desired to make sound like a tube amp.
Abstract:
A musical instrument preamplifier system is provided which comprises a filtering means for splitting an input signal into two or more separate frequency bands comprising a similar phase response for each frequency band, two or more non-linear circuits, each of which distorts the input signal component of one of the frequency bands, and a summing network for recombining said frequency bands.
Abstract:
Multiple channels simultaneously provide multiple, modified digital audio signals, respectively, based on the same digital audio input signal. Each channel has a respective nonlinear effects section to apply a nonlinear transfer function, such as one that emulates a vacuum tube guitar amplifier, based on the input signal. In addition, a respective audio effects section is provided in each channel to apply an audio effect, such as a linear audio effect, based on the input signal. This audio effect is set in each channel by a controller. In another embodiment, multi-tracker (e.g., double tracker) functionality is provided by the multiple channels wherein at least one of the delay effect, pitch shift, and gain change in a channel is automatically changed as a function of the input signal.
Abstract:
An audio system includes amplifying with distortion via a first amplifier electrical audio signals from a sound source, such as an electric guitar, for example, to obtain a desired tonal quality in the sound produced from a first loudspeaker driver by the amplified electrical audio signals, simultaneous with applying electrical signals from a piezo film transducer attached to the cone of the first loudspeaker to a second amplifier having a flat response over a desired frequency range, and adjustable low and high frequency rolloff, for driving a second loudspeaker to produce desired perceived tonal quality at relatively low sound pressure levels, with the volume of the sound from the first and second loudspeakers being adjusted to match the acoustics of a room in which the audio system is operating.
Abstract:
An electric instrument amplifier emulates an audio characteristics of a traditional vacuum-tube type amplifier. The electric instrument amplifier is formed in a single housing for amplifying an audio signal from an electric instrument. The electric instrument amplifier includes an A/D (analog-to-digital) converter for converting a first analog signal from the electric instrument to a digital signal, a digital signal processing circuit for processing the digital signal to add an intended effect to the digital signal, a D/A (digital-to-analog) converter for converting the digital signal processed by the digital signal processing circuit to a second analog signal, a tube amplifier having at least one vacuum-tube for amplifying the second analog signal, and a virtual power circuit formed with semiconductor devices for amplifying or attenuating an audio signal produced by the tube amplifier.
Abstract:
An amplifier circuit for providing a combined clean and dirty output signal from an electric guitar. The circuit comprises a panning pedal that has two potentiometers attached thereto so that movement of the panning pedal results in two continuously varying ranges of resistances being produced by the potentiometers. The output signal of the guitar is provided to the panning pedal and the resistance values of the potentiometers determine the proportion of the guitar output signal that is to be provided to a clean pre-amp stage and the proportion that is to be provided to a dirty pre-amp stage. The clean pre-amp stage amplifies the output signal substantially without distortion and the dirty pre-amp stage amplifies the signal so as to produce a saturated output signal. The output of the clean pre-amp stage and the dirty pre-amp stage are then combined to produce a single output signal. By changing the position of the panning pedal, the proportion between the dirty and clean signals in the single output signal can be continuously varied of a range of proportions.