Abstract in simplified Chinese:一种用于处理一数码音频广播信号之方法,包括:分离该数码音频广播信号之一模拟音频部分与一数码音频部分;判定该模拟音频部分及该数码音频部分在一第一短时间间隔内之响度;使用该模拟音频部分及该数码音频部分之该响度来计算一短期平均增益;判定一长期平均增益;将该长期平均增益或该短期平均增益中之一者转换为dB;若一输出已掺合至数码,则调整一数码增益参数达一预选择增量以产生一数码增益参数;若一输出尚未掺合至数码,则将该数码增益参数设置为该短期平均增益;将该数码增益参数提供至一音频处理器;及使用一第二短时间间隔重复以上步骤。
Abstract in simplified Chinese:一种用于在一无线电接收器中处理一数码音频广播信号之方法,该方法包含:接收一复合广播信号;解调制该复合广播信号以产生一模拟音频串流及一数码音频串流;及使用该模拟音频串流及该数码音频串流之包络之一归一化交叉相关来量测该模拟音频串流与该数码音频串流之间之一时间偏移。该时间偏移可被用以对准该模拟音频串流与该数码音频串流,用于随后将该无线电接收器之一输出自该模拟音频串流混合至该数码音频串流,或自该数码音频串流混合至该模拟音频串流。
Abstract in simplified Chinese:一种用于在一无线电接收器中处理一数码音频广播信号之方法包含:接收一数码音频广播信号;解调制该数码音频广播信号以产生一模拟音频串流及一数码音频串流;判定该数码音频串流之一数码信号品质值;在该数码信号品质值超过一自适应模拟转数码临限值时,将该无线电接收器之一输出自该模拟音频串流混合至该数码音频串流;及在该数码信号品质值下降至低于一自适应数码转模拟临限值时,将该无线电接收器之该输出自该数码音频串流混合至该模拟音频串流,其中该自适应数码转模拟临限值低于该自适应模拟转数码临限值。
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 signal includes: receiving a plurality of protocol data units, each having a header including a plurality of control word bits; and a plurality of audio frames, each including a cyclic redundancy check code; decoding the protocol data units using an iterative decoding technique, wherein the iterative decoding technique uses a soft output decoding algorithm for iterations after the first iteration; and using decoded cyclic redundancy check codes to flag the audio frames containing errors. A receiver that implements the method is also provided.
Abstract:
A method of transmitting digital information includes: receiving a plurality of information bits representing audio information and/or data; encoding the information bits using complementary low density parity check coding to produce a composite codeword and a plurality of independently decodable semi-codewords; modulating at least one carrier signal with the forward error corrected bits; and transmitting the carrier signal(s). Transmitters that implement the method, and receivers that receive signals produced by the method, are also provided.
Abstract:
A method for processing a digital signal includes: receiving a plurality of protocol data units, each having a header including a plurality of control word bits; and a plurality of audio frames, each including a cyclic redundancy check code; decoding the protocol data units using an iterative decoding technique, wherein the iterative decoding technique uses a soft output decoding algorithm for iterations after the first iteration; and using decoded cyclic redundancy check codes to flag the audio frames containing errors. A receiver that implements the method is also provided.
Abstract:
A method of transmitting digital information includes: receiving a plurality of information bits representing audio information and/or data; encoding the information bits using complementary low density parity check coding to produce a composite codeword and a plurality of independently decodable semi-codewords; modulating at least one carrier signal with the forward error corrected bits; and transmitting the carrier signal(s). Transmitters that implement the method, and receivers that receive signals produced by the method, are also provided.
Abstract:
A method and apparatus are provided for smoothly blending analog and digital portions of a composite digital audio broadcast signal by using look ahead metrics computed from previously received audio frames to dynamically adjust either stereo separation or bandwidth or both of the digital audio portion of the digital audio broadcast signal to produce an adjusted digital audio portion that is blended with the analog audio portion.
Abstract:
A method of block deinterleaving data received at a digital radio broadcast receiver is described. The method includes providing a block of memory having n x k addresses, wherein the block comprises a single table, receiving a digital radio broadcast signal at the receiver, and demodulating the digital radio broadcast signal into a plurality of interleaved data units. For at least one series of n x k data units a pointer step size is determined, and for each data unit in the series, an address in the block is calculated based on the pointer step size, and an output data unit is read from the block at the address, such that said output data units represent block deinterieaved data units. An input data unit from the plurality of interleaved data units is then written to the block at the address. Associated systems and computer readable storage media are presented.