Abstract: An audio amplifier includes a digital signal processor (DSP) that contains a noise shaping quantizer having an integrating error amplifier. The integrating error amplifier contains integrators connected in a feedback loop, a summer supplied with an output of each of the integrators, and a saturation function module producing a saturation function. A multiplier is disposed between each pair of adjacent integrators. The multiplier receives a signal from one of the adjacent integrators and the saturation function and supplies a signal to the other of the adjacent integrators. The saturation function decreases the effect of all of the integrators except an integrator to which an input signal to the integrating amplifier is supplied using an input signal to and/or an output signal from the noise shaping quantizer. This permits the duty ratio of the output signal from the noise shaping quantizer to extend from 0% to 100%.

Abstract: The present invention discloses a method and apparatus for wide dynamic range phase conversion. In one embodiment, inphase and quadrature signal components of a complex input signal are collapsed into a single quadrant to produce a first signal representation. A scaling operation is subsequently performed on the first signal representation to produce a second signal representation. Lastly, the second signal representation is converted into the phase domain.

Abstract: A method for improving burst acquisition in a receiver includes receiving a signal, and performing a sync word search on the signal, wherein the sync word search includes performing a hybrid synchronization technique, the hybrid synchronization technique including both a lower order modulation (e.g., BPSK) detection and correlation process and a higher order modulation (e.g., QPSK) detection and correlation process.

Abstract: A method and apparatus of converting a data signal in a digital rate converter including upsampling the input data signal at an input sampling rate to an intermediate data signal at an intermediate sampling rate, where the intermediate data signal sample values are stored in a buffer. A plurality of buffer position values are provided from a subset of buffer positions of the buffer to an interpolator, the subset of buffer positions being dependent upon a position indicator. An output data signal is provided by the interpolator at an output sampling rate, where the value of the output data signal is dependent upon a fractional indicator provided to the interpolator. The input sampling rate is based on a first clock signal and the output sampling rate is based on a second clock signal, wherein the first and second clock signal are independent of each other.

Abstract: The invention provides a method for generating a code sequence. A code-generation instruction is received from memory. One or more control signals are determined based on the code-generation instruction. A code sequence is generated based on the control signals, a current state input, and a mask input.

Abstract: The invention provides a method for generating a code sequence. A code-generation instruction is received from memory. One or more control signals are determined based on the code-generation instruction. A code sequence is generated based on the control signals, a current state input, and a mask input.

Abstract: One or more masks comprising pseudorandom sequence generating polynomials are utilized to derive new polynomials to thereby minimize the number of polynomials that need be stored to support use of pseudorandom sequences. The polynomials each correspond to a given state of a pseudorandom sequence and derivation of a particular such polynomial will allow calculation of the corresponding given state. A radio (85) in a code division multiple access wireless communications system (80) uses this approach to achieve rapid phase correlation with a pseudorandom sequence that is used by the system to facilitate synchronization.

Abstract: An apparatus and method of filtering at least one set of data comprises determining a subset of Q data elements of a set of L data elements (12), and determining a filtered value based upon the subset of Q data elements (14). Each of the subset of Q data elements is greater than at most a first predetermined number of the L data elements and greater than or equal to at least a second predetermined number of the L data elements other than itself.