Abstract: In a method of detecting whether a transmitted data frame is a discontinuous transmission (DTX) frame, a signal metric corresponding to the transmitted data frame is generated in a decoding operation used to decode the data frame from a signal carrying the frame that is received by a base station receiver. A signal energy of the transmitted data frame is determined based on the signal metric, and used for determining whether the transmitted data frame is a DTX frame.

Abstract: In a method of multipath acquisition for a dedicated traffic channel, path positions of the traffic channel that have desired signal energy for processing in a base station receiver may be determined as a function of information contained in a data part of the traffic channel.

Abstract: Whether a receiver supports blind data channel detection is determined, and transmission of control channel information associated with a data channel is disabled if the determining step determines the receiver is capable of detecting the data channel without the use of control channel information. Data is transmitted to the receiver on the data channel without the control channel information after disabling of the transmission of the control channel information.

Abstract: A plurality of decoding metrics for a current frame may be generated based on a correlation set for a current frame and a correlation set for at least one previous frame. Whether a signal is present on a control channel may then be determined based on the generated decoding metrics.

Abstract: Aspects of a method and system for signal phase variation detection in communication systems are presented. Aspects of the system may enable detection of phase change between a current received symbol, and one or more previous received symbols. Based on the phase change a channel estimation filter bandwidth may be selected for despreading and/or descrambling one or more subsequent received symbols. In addition, a decision may be made as to whether the subsequent received symbols are to be received based on a closed loop system, or based on an open loop system.

Abstract: Aspects of a method and system for detecting and identifying electronic accessories or peripherals utilizing a hardware audio CODEC are provided. In this regard, a hardware audio CODEC may be operable to compare one or more voltages on one or more biased pins of an accessory or peripheral port to one or more reference voltages and generate one or more digital representations of the one or more voltages on the biased one or more pins. An accessory or peripheral attached to the accessory or peripheral port may be identified based on the comparison and/or the generated one or more digital representations. The one or more bias voltages may be controlled based on a result of the comparison and/or the generated digital representations. The one or more bias voltages may be reduced after an attached accessory or peripheral has been identified.

Abstract: Aspects of a method and system for detecting interrupts from detachable electronic accessories or peripherals are provided. In this regard, a hardware audio CODEC may be operable to compare a voltage on one or more biased pins of an accessory or peripheral port to one or more reference voltages and filter one or more output signals generated from the comparison. When an accessory or peripheral is coupled to the accessory or peripheral port, interrupts from the accessory or peripheral may be detected based on results of the comparison and/or the filtering. An interrupt may be detected when the voltage on the one or more pins may be below the one or more reference voltages. An interrupt may be detected when the voltage on the one or more pins may be below the one or more reference voltages for a plurality of consecutive clock cycles.

Abstract: In a 3GPP standards Release 6 UMTS system, in order to avoid searching at NodeB for a maximum E-DPCCH-associated metric at discrete possible valid index values, or over disjoint possible valid index regions, at the UE the three different sources of information, the fixed number bits that comprise the RSN, TFI and the H-bit components of the E-DPCCH bit field, are mapped so that the decimal equivalents of the possible E-DPCCH indices lie within a continuous range of values.

Abstract: A system for processing radio frequency (RF) signals includes a searcher and a plurality of Cluster Path Processor (CPPs). The searcher detects a maximum signal energy level and position of at least one of a plurality of individual distinct path signals in a signal cluster of a first information signal, wherein at least a portion of the plurality of individual distinct path signals is received within a duration of a corresponding delay spread. The sampling position is used as a starting sampling location by the plurality of CPPs, including a first information signal CPP and a second information signal CPP. Fine sampling positions of the plurality of CPPs are based upon channel energy estimates for the plurality of individual distinct path signals. CPP outputs are employed to produce channel estimates, which are themselves used in subsequent equalization operations. Sampling positions may change over time in order to satisfy alignment criteria.

Abstract: A system and method for determining the performance of a channel emulator includes an input signal, at least one transmitter configured to receive the input signal, the at least one transmitter coupled to at least one receiver through the channel emulator, the at least one transmitter configured to transmit the input signal through the channel emulator, the at least one receiver configured to receive a faded receive signal. The system also comprises a signal processor configured to receive a processor signal and the faded receive signal, the signal processor configured to correlate the processor signal and the faded receive signal to develop a correlated signal that represents a channel impulse of the channel emulator. The channel impulse of the channel emulator is used to extract at least one channel coefficient that reflects the performance of the channel emulator.

Abstract: Aspects of a method and/or system for processing high quality audio in a hardware audio CODEC for audio transmission are provided. In this regard, an audio signal may be down-sampled via a cascaded plurality of filters and sample rate converters in the hardware audio CODEC. Additionally, a portion of each sample of the audio signal may be selected based on an origin of the audio signal. The selected portion of each sample of the audio signal may comprise 16 or 18 bits. The selected portion may be determined based on a type, a class, a manufacturer identifier, and/or a model identifier of the origin the audio signal. Coefficients of the filters may be configured based on the origin of the audio signal. One or more of the filters may comprise one or more cascaded biquads. The sample rate converters may comprise one or more CIC decimation filters.

Abstract: Aspects of a method and system for digital gain control in an audio CODEC are provided. In this regard, in a hardware audio CODEC, a plurality of gain values in decibel format may be generated and may be summed to generate an overall gain value in decibels. Gain values may be ramped over a plurality of audio samples. The overall gain value in decibels may then be utilized to scale one or more audio signals. A first portion of the overall gain value in decibels may be converted to a scalar and a remaining portion of the overall gain value in decibels may be converted to a shift count. Accordingly, the scaling may comprise multiplying one or more audio signals by the scalar to generate one or more scaled audio signals and shifting the scaled audio signals by a number of bits equal to the shift count.

Abstract: Aspects of a method and system for processing audio signals via separate input and output processing paths are provided. In this regard, a hardware audio CODEC comprising one or more audio inputs and one or more audio outputs and may be enabled to route, via one or more switching elements, audio signals from any of the inputs to any of the outputs. The CODEC may be enabled to simultaneously process a plurality of audio signals based on a configuration of the switching elements. Upstream from the switching elements, received audio signals may be processed independent of an output to which the may be communicated. Downstream from said switching elements audio signals may be processed independent of an input via which the signals were received.

Abstract: In a hardware audio CODEC which processes audio signals from a plurality of inputs, voltage and/or power levels of the input audio signals may be adjusted such that the digitally adjusted levels are approximately equal for each of the plurality of inputs. The digital adjustment may comprise, for each audio sample of one of the input audio signals, adding the audio sample to one or more right shifted versions of the audio sample and selecting a portion of a summed audio signal resulting from the addition. The portion of the summed audio that is selected may be determined based on the type of audio content being processed. The one or more right shifted versions of the audio sample may be selected via one or more switching elements which may be controlled via a digital control word which may be dynamically generated.

Abstract: Aspects of a method and system for dual voice path processing in an audio CODEC may enable selecting two or more signals received via one or more audio input devices, and filtering and down-sampling each of the selected signals via two or more signal processing branches. Furthermore, an output sample rate of each of the signal processing branches may be configured independently. The signal processing branches may each comprise one or more IIR filters with configurable coefficients and one or more cascaded-integrate-comb (CIC) decimation filters having a configurable decimation ratio. A first of the selected signals, may be filtered and/or down-sampled to generate a signal having a first, lower, sample rate, and a second of the signals may be filtered and/or down-sampled to generate a signal having a second, higher, sample rate. One or more post-processing algorithms such as audio beamforming may also be performed on the selected signals.

Abstract: In a method and system for audio level detection and control, an amplitude of an audio signal may be compared to a threshold and an attenuation applied to the audio signal may be adjusted based on the comparison. In instances that the amplitude of the audio signal is greater than or equal to the threshold the adjustment may comprise increasing a first attenuation factor until the amplitude of the audio signal is less than the threshold. The first attenuation factor may be subsequently decreased until the amplitude of the audio signal is greater than or equal to the threshold or until the first attenuation factor is equal to zero. The attenuation of the audio signal may be controlled via a digital gain circuit within the hardware audio CODEC, wherein an overall attenuation factor of the digital gain circuit is a sum of the first attenuation factor and a second attenuation factor.

Abstract: In a method and system for frequency compensation in an audio CODEC, a filter in a hardware audio CODEC may be configured based on power consumption and based on a frequency response of an active output device to which the filter is communicatively coupled. The filter may comprise a plurality of filter stages, which may be, for example, biquads, and the filter may be configured by enabling or disabling one or more of the stages. In this manner, power consumption of the filter may be managed by enabling and/or disabling one or more stages. Configuration of the filter may be performed dynamically depending on whether one or more audio output devices may be active. In this regard, which output device is active and its frequency response may be determined and filter coefficients may be reconfigured upon a change in which output device may be active.

Abstract: Aspects of a method and system for audio feedback processing in an audio CODEC are provided. In this regard, in a hardware audio CODEC for a wireless device, voice content from a first audio source may be mixed with audio content from one or more second audio sources to generate a composite audio signal. The composite audio may be transmitted to one or more far-end communication partners via a wireless communication channel. The wireless communication channel may be a channel of a cellular network. The composite audio signal may also be mixed with audio content received from a far-end communication partner and output to a local user via one or more audio output devices. The audio content from the second audio sources may comprise music played from a digital storage medium within the wireless device and/or music extracted from a signal received by the wireless device.

Abstract: Aspects of a method and system for output device protection in an audio CODEC are provided. A hardware audio CODEC comprising one or more equalizers may measure strength of one or more frequency bands of an audio signal. Gain settings for the equalizers may be determined utilizing, for example, one or more look-up tables based on the measured strength(s). The gain settings may be determined based on whether the audio signal comprises voice, music, and/or ringtone data. The gain setting may also be determined based on a sample rate of the audio signal; a frequency response of one or more filters within the CODEC; gain settings of one or more gain processing circuits within the CODEC; a subjective loudness curve; characteristics of one or more audio output devices communicatively coupled to the wireless device; and/or characteristics of one or more audio input devices communicatively coupled to the wireless device.

Abstract: Aspects of a method and system for multi-band amplitude estimation and gain control in an audio CODEC are provided. In this regard, an audio signal may be filtered and delayed to generate one or more sub-band signals, a gain may be applied to each sub-band signal to generate one or more level adjusted sub-band signals, and the one or more level adjusted signals may be added to a delayed version of the audio signal. The gain applied to a particular one of the one or more sub-band signals may be controlled based on a detected amplitude of a summed signal derived by summing the particular one of the one or more sub-band signals and a corresponding one of the one or more level-adjusted sub-band signals.