Abstract: A method for processing a radio signal includes producing first and second streams of audio samples; decimating the first and second streams of audio samples to produce first and second streams of decimated streams of audio samples; estimating a first offset value between corresponding samples in the first and second streams of decimated streams of audio samples; shifting one of the first and second streams of audio samples by a first shift value; decimating the first and second streams of audio samples to produce third and fourth streams of decimated audio samples; estimating a second offset value; determining a final offset value based on an intersection of ranges of valid results of the first and second offset values; and shifting one of the first and second streams of audio samples by the final offset value to align the first and second streams of audio samples.

Abstract: A method for processing a digital audio broadcast signal includes: separating an analog audio portion and a digital audio portion of the digital audio broadcast signal; determining the loudness of the analog audio portion and the digital audio portion over a first short time interval; using the loudness of the analog and digital audio portions to calculate a short term average gain; determining a long term average gain; converting one of the long term average gain or the short term average gain to dB; if an output has been blended to digital, adjusting a digital gain parameter by a preselected increment to produce a digital gain parameter; if an output has not been blended to digital, setting the digital gain parameter to the short term average gain; providing the digital gain parameter to an audio processor; and repeating the above steps using a second short time interval.

Abstract: A method for processing a digital audio broadcast signal includes: separating an analog audio portion and a digital audio portion of the digital audio broadcast signal; determining the loudness of the analog audio portion and the digital audio portion over a first short time interval; using the loudness of the analog and digital audio portions to calculate a short term average gain; determining a long term average gain; converting one of the long term average gain or the short term average gain to dB; if an output has been blended to digital, adjusting a digital gain parameter by a preselected increment to produce a digital gain parameter; if an output has not been blended to digital, setting the digital gain parameter to the short term average gain; providing the digital gain parameter to an audio processor; and repeating the above steps using a second short time interval.

Abstract: A method for processing a radio signal includes producing first and second streams of audio samples; decimating the first and second streams of audio samples to produce first and second streams of decimated streams of audio samples; estimating a first offset value between corresponding samples in the first and second streams of decimated streams of audio samples; shifting one of the first and second streams of audio samples by a first shift value; decimating the first and second streams of audio samples to produce third and fourth streams of decimated audio samples; estimating a second offset value; determining a final offset value based on an intersection of ranges of valid results of the first and second offset values; and shifting one of the first and second streams of audio samples by the final offset value to align the first and second streams of audio samples.

Abstract: A switched-capacitor DAC system includes two switched-capacitor DACs and a load circuit. The switched-capacitor filter of the first DAC samples a reference voltage source, which produces a reference voltage, at a first rate and the switched-capacitor filter of the second DAC samples the reference voltage source at a second rate, greater than the first rate. The load circuit samples the reference voltage source at a rate such that the level of the reference voltage is the same each time a sample is taken. The load circuit effectively equates the sampling of the two filters and substantially eliminates problems related to gain errors and low frequency quantization noise.

Abstract: A switched-capacitor DAC system includes two switched-capacitor DACs and a load circuit. The switched-capacitor filter of the first DAC samples a reference voltage source, which produces a reference voltage, at a first rate and the switched-capacitor filter of the second DAC samples the reference voltage source at a second rate, greater than the first rate. The load circuit samples the reference voltage source at a rate such that the level of the reference voltage is the same each time a sample is taken. The load circuit effectively equates the sampling of the two filters and substantially eliminates problems related to gain errors and low frequency quantization noise.

Abstract: An all CMOS voltage comparator circuit which incorporates a strobed latch. A strobe signal precharges the entire circuit to a known state which is independent of the input voltages and in which substantially no static current is drawn. Under static conditions after the circuit has been strobed, the source coupled pair is virtually disconnected from the supply voltage(s) and draws almost no current, as well. When the circuit is strobed, a source coupled FET pair amplifies the differential input signal, with positive feedback provided through a pair of cross coupled PMOS load transistors, as well as cross coupled NMOS cascode transistors. The source coupled pair feeds a pair of output buffers, or drivers, whose FETs are sized such that a "low" voltage level is generated on both outputs until the source-coupled pair resolves the input voltage difference (i.e., the differential input voltage exceeds the switching threshold). At that time, the outputs become complementary digital levels and are usable.

Abstract: A method for processing a radio signal includes producing first and second streams of audio samples; decimating the first and second streams of audio samples to produce first and second streams of decimated streams of audio samples; estimating a first offset value between corresponding samples in the first and second streams of decimated streams of audio samples; shifting one of the first and second streams of audio samples by a first shift value; decimating the first and second streams of audio samples to produce third and fourth streams of decimated audio samples; estimating a second offset value; determining a final offset value based on an intersection of ranges of valid results of the first and second offset values; and shifting one of the first and second streams of audio samples by the final offset value to align the first and second streams of audio samples.

Abstract: A method for processing a digital audio broadcast signal includes: separating an analog audio portion and a digital audio portion of the digital audio broadcast signal; determining the loudness of the analog audio portion and the digital audio portion over a first short time interval; using the loudness of the analog and digital audio portions to calculate a short term average gain; determining a long term average gain; converting one of the long term average gain or the short term average gain to dB; if an output has been blended to digital, adjusting a digital gain parameter by a preselected increment to produce a digital gain parameter; if an output has not been blended to digital, setting the digital gain parameter to the short term average gain; providing the digital gain parameter to an audio processor; and repeating the above steps using a second short time interval.