Abstract: The present invention relates to a musical instrument tuner, e.g. a guitar tuner, featuring tuning as a part of a user session.

Abstract: A musical instrument tuner for string instruments is provided which comprises a signal classifier for determining a signal class of an input signal from a number of monophonic signal classes and a number of polyphonic signal classes, a signal analyzer for determining at least one representation of a pitch frequency of the input signal, and an indicator for displaying an output established on the basis of the signal class and the representation of a pitch frequency.

Abstract: The present invention relates to a musical instrument tuner, e.g. a guitar tuner, featuring different levels of detail for displaying monophonic and polyphonic characteristics of an input signal.

Abstract: A musical instrument tuner for string instruments is disclosed, which comprises a signal classifier for determining a signal class of an input signal from a number of monophonic signal classes and a number of polyphonic signal classes, a signal analyzer for determining at least one representation of a pitch frequency of the input signal, and an indicator for displaying an output established on the basis of the signal class and the representation of a pitch frequency, wherein the indicator includes at least a monophonic display mode and at least a polyphonic display; and wherein the display mode is selected in dependency of the signal class determined by the signal classifier. Tuning methods, computer program products, music instruments, amplifiers and audio processors relating to the above are also disclosed.

Abstract: The present invention relates to a musical instrument tuner, e.g. a guitar tuner, featuring tuning as a part of a user session.

Abstract: The present invention relates to a musical instrument tuner, e.g. a guitar tuner, featuring simultaneous display of monophonic and polyphonic characteristics.

Abstract: The present invention relates to a musical instrument tuner, e.g. a guitar tuner, featuring different levels of detail for displaying monophonic and polyphonic characteristics of an input signal.

Abstract: The present invention relates to a musical instrument tuner, e.g. a guitar tuner, featuring tuning as a part of a user session.

Abstract: A musical instrument tuner for string instruments is disclosed, which comprises a signal classifier for determining a signal class of an input signal from a number of monophonic signal classes and a number of polyphonic signal classes, a signal analyzer for determining at least one representation of a pitch frequency of the input signal, and an indicator for displaying an output established on the basis of the signal class and the representation of a pitch frequency, wherein the indicator includes at least a monophonic display mode and at least a polyphonic display; and wherein the display mode is selected in dependency of the signal class determined by the signal classifier. Tuning methods, computer program products, music instruments, amplifiers and audio processors relating to the above are also disclosed.

Abstract: The invention relates to an A/D converter comprising an input and an output, a D/A converting feedback and a pulse width modulating forward path, the D/A converting feedback comprising at least one feed-back path, the feed-back path establishing a D/A conversion based on at least two D/A conversions subject to uncorrelated errors. The invention further relates to a jitter consequence reducing D/A-converter comprising a jitter-robust intermediate signal established on the basis of a digital input signal. The invention further relates to a method for jitter consequence reduction in a pulse width modulated A/D-converter feedback, comprising establishing at least two D/A-conversions subject to uncorrelated errors, and combining, preferably by summing, said at least two D/A-conversions.

Abstract: The present invention relates to a musical instrument tuner, e.g. a guitar tuner, featuring tuning as a part of a user session.

Abstract: The invention relates to a hardware implemented filtering method including establishing a representation DIS of the derivative of at least a part of a time-quantized input signal IS, and establishing at least one sample of a time- and amplitude-quantized output signal OS by performing filtering on the basis of at least a part of a filter representation IFC1, IFC2, IFC3 and the representation DIS of the derivative of at least a part of the input signal IS. The invention further relates to a hardware implemented decimation method for decimating a time-quantized input signal IS including dividing the time-quantized input signal IS into intervals, for each of the intervals establishing a sample of a time- and amplitude-quantized output signal OS according to the above mentioned filtering method. The invention further relates to a fast filtering means FFM implementing the above-mentioned methods.

Abstract: A two-channel amplifier with common signal including a splitter for establishing three intermediate signals on the basis of two input signals, wherein the three intermediate signals represent two channels, one of the three intermediate signals being a common signal common to both of the two channels and having a representation based on a sum of the two input signals.

Abstract: The invention relates to an A/D converter comprising an input and an output, a D/A converting feedback and a pulse width modulating forward path, the D/A converting feedback comprising at least one feed-back path, the feed-back path establishing a D/A conversion based on at least two D/A conversions subject to uncorrelated errors. The invention further relates to a jitter consequence reducing D/A-converter comprising a jitter-robust intermediate signal established on the basis of a digital input signal. The invention further relates to a method for jitter consequence reduction in a pulse width modulated A/D-converter feedback, comprising establishing at least two D/A-conversions subject to uncorrelated errors, and combining, preferably by summing, said at least two D/A-conversions.

Abstract: The invention relates to a method of determining an impedance function IF of a load LS driven by an amplifier AM, said method comprising the steps of providing a digital audio signal DAS to said amplifier AM, measuring one of either a current signal representation CSR of current provided to said load LS by said amplifier AM or a voltage signal representation VSR of voltage provided to said load LS by said amplifier AM, determining a digital signal representation DSR on the basis of said digital audio signal DAS, and determining said impedance function IF of said load LS on the basis of said digital signal representation DSR and said measured one of either said current signal representation CSR or said voltage signal representation VSR.

Abstract: The invention relates to pulse width modulator system (PWMS) comprising a modulator system input (MI),a modulator output (MO), an amplitude distribution filter (ADF) ,and a pulse width modulator (PMOD), wherein said amplitude distribution filter (ADF) establishes an intermediate output signal (OS) by modifying the level of the amplitude distribution of an input signal (IS) within at least one predetermined amplitude range of said input signal (IS), said input signal (IS) being received from said modulator system input (MI), and wherein said pulse width modulator (PMOD) provides a modulator output signal (MOS) on said modulator output(MO) on the basis of said intermediate output signal (OS).

Abstract: The invention relates to a high-mode self-oscillating pulse modulator. According to the invention, a complete rethinking of preconditions for oscillation and modulation in an oscillating modulator as all conventional thinking of how to apply oscillation in a modulator has been set aside. Thus, according to the invention, high-mode oscillation refers to an oscillation at a higher mode than the first mode, which is conventionally regarded as the one and only applicable mode in an oscillating modulator.

Abstract: The present invention relates to a self-oscillating modulator (2) comprising a PWM cycle constrainer (21). The present invention further relates to a method of stabilising the switch frequency of a self-oscillating modulator operating on a high level input signal, whereby at least one PWM cycle constraint representative signal (26, 32, 33) is applied to a pulse width modulated signal (18) within said self-oscillating modulator (2). The present invention further relates to a method of avoiding pulses narrower than a predetermined minimum pulse width or wider than a predetermined maximum pulse width in a self-oscillating modulator (2) operating on a high level input signal, whereby at least one PWM cycle constraint representative signal (26, 32, 33) is applied to a pulse width modulated signal (18) within said self-oscillating modulator.

Abstract: The invention relates to an amplifier comprising amplification means (AM) comprising an input and an output, said amplification means (AM) comprising a switching output stage delivering at least one output signal (OUS) via said output, said amplification means being fed by power supply means (PSM) said amplifier further comprising compensation means (CM) providing a compensation signal (CS) derived from the power supply voltage (PSV) of the power supply means (PSM), said compensation signal (CS) comprising a substantially inverse representation of said power supply voltage (PSV) and said compensation signal (CS) being fed to said amplification means (AM). According to the invention, an effective error compensation of the output switching stage may in practice be implemented by establishment of a compensation, which on a run-time basis is based on the voltage of the power supply currently applied in the output switching stage.

Abstract: The invention relates to an amplifier comprising amplification means (AM) comprising an input and an output, said amplification means (AM) comprising a switching output stage delivering at least one output signal (OUS) via said output, said amplification means being fed by power supply means (PSM) said amplifier further comprising compensation means (CM) providing a compensation signal (CS) derived from the power supply voltage (PSV) of the power supply means (PSM), said compensation signal (CS) comprising a substantially inverse representation of said power supply voltage (PSV) and said compensation signal (CS) being fed to said amplification means (AM). According to the invention, an effective error compensation of the output switching stage may in practice be implemented by establishment of a compensation, which on a run-time basis is based on the voltage of the power supply currently applied in the output switching stage.