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US 8,306,245 B2Granted
Multi-mode audio amplifiers
AssigneeMarvell World Trade Ltd.
InventorZining Wu
Life of this patent
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Abstract
A multimode audio amplifier comprises: a mode controller adapted to provide a control signal; and at least one multimode module, wherein each of the multimode modules has a plurality of operating modes, wherein the operating modes are selected in accordance with the control signal, wherein changing the operating modes results in a measurable change in at least one characteristic of the multimode audio amplifier; wherein the characteristics of the multimode audio amplifier consist of signal to noise ratio (SNR); total harmonic distortion and noise (THD+N); input to output delay; power consumption; and efficiency.
Claims26
A multimode audio amplifier comprising:
- a mode controller configured to provide a control signal;
- at least one multimode module, wherein each of the multimode modules is configured to operate in one of a plurality of operating modes, wherein the operating modes are selected in response to the control signal, wherein changing the operating modes results in a measurable change in at least one characteristic of the multimode audio amplifier, and wherein the characteristics of the multimode audio amplifier include
- signal to noise ratio (SNR),
- total harmonic distortion and noise (THD+N),
- input to output delay,
- power consumption, and
- efficiency;
- and
- a variable-length finite impulse response (FIR) filter configured to provide an output signal based on an input signal, wherein a length of the variable-length FIR filter is selected in response to the control signal, wherein the length of the variable-length FIR filter represents at least one of
- an order of the variable-length FIR filter, and
- a number of taps of the variable-length FIR filter, and
- wherein the variable-length FIR filter comprises
- a first fixed-length FIR filter configured to provide a first filtered signal based on the input signal,
- a second fixed-length FIR filter configured to provide a second filtered signal based on the first filtered signal, and
- an output module configured to provide one of the first filtered signal and the second filtered signal as the output signal in response to the control signal.
12 more elements
A multimode audio amplifier comprising:
- means for providing a control signal;
- at least one multimode means for operating in a plurality of modes, wherein each of the multimode means operates in one of the plurality of the modes, wherein the modes are selected in response to the control signal, wherein changing the modes results in a measurable change in at least one characteristic of the multimode audio amplifier, and wherein the characteristics of the multimode audio amplifier include
- signal to noise ratio (SNR),
- total harmonic distortion and noise (THD+N),
- input to output delay,
- power consumption, and
- efficiency;
- and
- filter means for providing an output signal based on an input signal, wherein a length of the filter means is selected in response to the control signal, wherein the length of the filter means represents at least one of
- an order of the filter means, and
- a number of taps of the filter means, and
- wherein the filter means comprises
- first filter means for providing a first filtered signal based on the input signal,
- second filter means for providing a second filtered signal based on the first filtered signal, and
- output means for providing one of the first filtered signal and the second filtered signal as the output signal in response to the control signal.
12 more elements
An apparatus comprising:
- a filter controller configured to provide a control signal;
- and
- a variable-length finite impulse response (FIR) filter configured to provide an output signal based on an input signal, wherein a length of the variable-length FIR filter is selected in response to the control signal, wherein the length of the variable-length FIR filter represents at least one of
- an order of the variable-length FIR filter, and
- a number of taps of the variable-length FIR filter, and
- wherein the variable-length FIR filter comprises
- a first fixed-length FIR filter configured to provide a first filtered signal based on the input signal,
- a second fixed-length FIR filter configured to provide a second filtered signal based on the first filtered signal, and
- an output module configured to provide one of the first filtered signal and the second filtered signal the output signal in response to the control signal.
6 more elements
An apparatus comprising:
- filter controller means for providing a control signal;
- and
- filter means for providing an output signal based on an input signal, wherein a length of the filter means is selected in response to the control signal, wherein the length of the filter means represents at least one of
- an order of the filter means, and
- a number of taps of the filter means, and
- wherein the filter means comprises
- first filter means for providing a first filtered signal based on the input signal,
- second filter means for providing a second filtered signal based on the first filtered signal, and
- output means for providing one of the first filtered signal and the second filtered signal as the output signal in response to the control signal.
6 more elements
Dependencies are inferred from the claim text.