Abstract: A method and apparatus are provided for blending analog and digital portions of a composite digital radio broadcast signal by processing compressed audio packets to compute corresponding digital audio quality indicator values, storing the compressed audio packets in an audio blend buffer, processing audio information from each compressed audio packet stored in the audio blend buffer with an audio decoder to generate decompressed digital audio signal samples, and using the digital audio quality indicator values to guide a blending process for combining analog audio signal samples with the digital audio signal samples to produce an audio output by preventing unnecessary blending back and forth between analog and digital if the digital audio quality indicator values indicate that the compressed audio packets are degraded or impaired.

Abstract: A method and apparatus are provided for blending analog and digital portions of a composite digital radio broadcast signal by processing compressed audio packets to compute corresponding digital audio quality indicator values, storing the compressed audio packets in an audio blend buffer, processing audio information from each compressed audio packet stored in the audio blend buffer with an audio decoder to generate decompressed digital audio signal samples, and using the digital audio quality indicator values to guide a blending process for combining analog audio signal samples with the digital audio signal samples to produce an audio output by preventing unnecessary blending back and forth between analog and digital if the digital audio quality indicator values indicate that the compressed audio packets are degraded or impaired.

Abstract: Methods and systems for correcting a frequency error in a digital portion of a radio broadcast signal are disclosed. The methods and systems include the steps of receiving a radio broadcast signal having an analog portion and a digital portion, separating the analog portion of the radio broadcast signal and the digital portion of the radio broadcast signal, determining a coarse frequency offset of the analog portion of the radio broadcast signal, generating an error signal for adjusting a frequency of the digital portion of the radio broadcast signal, wherein the error signal is based on the coarse frequency offset of the analog portion of the radio broadcast signal, and adjusting the frequency of the digital portion of the radio broadcast signal with the error signal that is based on the coarse frequency offset of the analog portion of the radio broadcast signal, such that a frequency error in the digital portion of the radio broadcast signal is reduced below a predetermined amount.

Abstract: Methods and systems for correcting a frequency error in a digital portion of a radio broadcast signal are disclosed. The methods and systems include the steps of receiving a radio broadcast signal having an analog portion and a digital portion, separating the analog portion of the radio broadcast signal and the digital portion of the radio broadcast signal, determining a coarse frequency offset of the analog portion of the radio broadcast signal, generating an error signal for adjusting a frequency of the digital portion of the radio broadcast signal, wherein the error signal is based on the coarse frequency offset of the analog portion of the radio broadcast signal, and adjusting the frequency of the digital portion of the radio broadcast signal with the error signal that is based on the coarse frequency offset of the analog portion of the radio broadcast signal, such that a frequency error in the digital portion of the radio broadcast signal is reduced below a predetermined amount.