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| Number | Title | Issue Date |
| 7835772 | FM output portable music player with RDS capability A FM output portable audio player is provided for digitally coupling audio signals generated therein to be broadcast through a radio receiver system, such as an automobile radio. The audio player includes an audio signal source for generating digital audio output si... | 11/16/2010 |
| 7643573 | Power management in a data acquisition system A data acquisition system includes a programmable gain amplifier, an analog-to-digital converter, a filter, and control circuitry. The programmable gain amplifier is operatively connected to receive an analog input signal on its input and generates an amplified sign... | 01/05/2010 |
| 7365669 | Low-delay signal processing based on highly oversampled digital processing A low-delay signal processing system and method are provided which includes a delta-sigma analog-to-digital converter, an oversampling processor, and a delta-sigma digital-to-analog converter. The delta-sigma analog-to-digital converter receives an input or audio si... | 04/29/2008 |
| 7324025 | Non-integer interpolation using cascaded integrator-comb filter A non-integer CIC interpolation filter is provided for use in sigma-delta digital-to-analog systems, which realizes non-integer interpolation but eliminates the need for coupling of the integrators in the output domain. The present non-integer interpolation filter p... | 01/29/2008 |
| 7283076 | Digital non-integer sample/hold implemented using virtual filtering A method and apparatus for implementing non-integer sample hold operations in a sigma-delta digital-to-analog converter system includes an interpolation filter, a polyphase filter circuit, and a modulator. The polyphase filter circuit is used to virtual upsample a d... | 10/16/2007 |
| 7215267 | Analog-to-digital converter with dither control An analog-to-digital converter system comprises an analog-to-digital converter and a dither generator. The analog-to-digital converter receives an analog input signal and generates a digital signal that is proportional to the analog input signal. The output of the a... | 05/08/2007 |
| 7196648 | Non-integer decimation using cascaded intergrator-comb filter A non-integer decimation filter for decimating an input value includes a first integrator for integrating the input value in an input sample domain at an input sample rate and for generating a first integral of the input value at its output and a second integrator f... | 03/27/2007 |
