Abstract: A headphone apparatus and method of designing the apparatus, the apparatus having selectable EQ mode circuitry configured for listening to different types of audio signals. The EQ mode circuits comprise only passive circuit elements, and each is configured for listening to audio signals having a different characteristic sound profile. The EQ circuits can be switched in and out of the audio signal path to the headphone earpieces, using a switch selector. The selector is configured to operate the plurality of switches such that only a select one of them can be closed at a time.

Abstract: A data processing device for detecting and correcting data errors of a re-writable memory via an error correction algorithm. In one embodiment, the data processing device includes a coding unit implemented in hardware and an error correction unit implemented in software. In one embodiment, the coding unit is capable receiving a first set of data to be written to the memory and processing that data in accordance with an error correction algorithm to form a second set of data. The second set of data may be output to memory. In one embodiment, the coding unit receives data from the memory and processes that data in accordance with the error correction algorithm to determine whether the data contains an error. In one embodiment, the error correction unit receives data that contains an error and produces corrected data via an error correction algorithm. The corrected data may be output to the memory.

Abstract: A random number generator comprising a sigma-delta modulator, the sigma-delta modulator having a modulation unit and a feedback loop arranged to receive a digital output signal from the modulator and form an adjustment signal in dependence on the digital output signal such that at any given time the absolute difference between an amplitude of a summation output signal of the modulator and a quantizer threshold of the modulator is less than the first voltage range. The random number generator is thus capable of forming a digital output signal that has a high degree of entropy.

Abstract: A radio comprising a receiver for receiving signals comprising a plurality of signal components of different carrier frequencies and a tuner for selecting a signal component of a particular carrier frequency from the plurality of received signal components, the radio having a user interface comprising a user input component and the radio being configured to cause the tuner to operate in a first tuning mode when the user input component is activated for less than a first period of time, operate in a second tuning mode when the user input component is activated for longer than the first period of time and less than a second period of time and operate in a third tuning mode when the user input component is activated for at least the second period of time.

Abstract: A data processing device for detecting and correcting data errors of a re-writable memory via an error correction algorithm. In one embodiment, the data processing device includes a coding unit implemented in hardware and an error correction unit implemented in software. In one embodiment, the coding unit is capable receiving a first set of data to be written to the memory and processing that data in accordance with an error correction algorithm to form a second set of data. The second set of data may be output to memory. In one embodiment, the coding unit receives data from the memory and processes that data in accordance with the error correction algorithm to determine whether the data contains an error. In one embodiment, the error correction unit receives data that contains an error and produces corrected data via an error correction algorithm. The corrected data may be output to the memory.

Abstract: A random number generator comprising a sigma-delta modulator, the sigma-delta modulator having a modulation unit and a feedback loop arranged to receive a digital output signal from the modulator and form an adjustment signal in dependence on the digital output signal such that at any given time the absolute difference between an amplitude of a summation output signal of the modulator and a quantizer threshold of the modulator is less than the first voltage range. The random number generator is thus capable of forming a digital output signal that has a high degree of entropy.

Abstract: A sigma-delta modulator for forming a digital output signal representative of the magnitude of an analog input signal, the modulator comprising a modulation unit comprising: a summation unit for summing the analog input signal with an adjustment signal to form a summation output signal; an integrator arranged to receive the summation output signal and form an integrator output signal dependent thereon; and a quantizer arranged to receive the integrator output signal and form the digital output signal dependent thereon; the sigma-delta modulator further comprising a feedback loop for generating the adjustment signal and comprising a selection circuit arranged to form the adjustment signal by selecting between one of two boundary values for the adjustment signal, the selection being performed in dependence on the digital output signal.