A circuit to realize the phase judgment function of Liyin signal in the audio system
A phase judgment and audio system technology, applied in the field of audio signal phase judgment and audio signal processing, can solve the problems of occupying large DSP system resources, small data volume, large data volume, etc., to save system resources, reduce processing rate, The effect of increasing the decoding speed
Active Publication Date: 2017-06-20
CRM ICBG (WUXI) CO LTD
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[0004] Therefore, if software is used for phase judgment, the realization of the calculation process will occupy a large amount of DSP resources. Due to the improvement of the processing speed of DSP in the entire processing process, the amount of received data is very large, and the amount of processed data is very small, so it takes up a lot of resources. DSP system resources
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[0045] In order to describe the technical content of the present invention more clearly, further description will be given below in conjunction with specific embodiments.
[0046] The technical scheme of the present invention is: adopt the function of hardware realization phase judgment, at first store demodulated I with the first D flip-flop array, the sampling value of Q two-way continuous 51 points, calculate with multiplier and adder to be separated by 51 The sine value and advance value of the phase difference corresponding to two sampling points of a sampling point, compare the sine and advance value and sign bit with a comparator, determine the quadrant of the coordinate axis where the phase difference of each sampling point is located, and use two bits The D flip-flop stores quadrant states represented by 0, 1, 2, and 3. According to the compensation principle provided by the algorithm, the continuous state is sampled and compensated every 51 points according to a cert...
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The invention relates to a circuit for realizing the phase judgment function of Liyin signal in an audio system, which includes an I-channel signal latch module, a Q-channel signal latch module, a phase difference sine value calculation module, a phase difference cosine value calculation module, a phase Difference quadrant judging module and recovery compensating module, the input end of described phase difference sine value calculation module is respectively connected with described I road audio signal, the output end of described I road signal latch module, described Q road audio frequency The signal is connected to the output end of the Q-channel signal latch module. The circuit with this structure to realize the phase judgment function of Liyin signal in the audio system can realize the phase judgment function of Liyin signal in the audio system completely by using the hardware structure, without any software intervention, which greatly reduces the system's phase judgment function. The consumption of system resources during the judgment reduces the burden on the data processor, the structure is simple, the use is convenient, and the application scope is wider.
Description
technical field [0001] The present invention relates to the field of audio signal processing, in particular to the field of phase judgment of audio signals, and specifically refers to a circuit for realizing the phase judgment function of Liyin signals in an audio system. Background technique [0002] At present, the application of NICAM (Near Instantaneous Companded Audio Multiplex) or NICAM decoding is not very common, and the phase judgment of the existing NICAM decoding part is basically implemented by software, that is, through DSP (Digital Signal Processer), that is, digital signal processing The processor does calculations, and stores the corresponding input and output and intermediate processing in the DSP resource. After the DSP processor receives and stores the audio data in real time, it performs phase judgment. [0003] The NICAM audio signal obtained with a sampling frequency of 18.432MHz can be decoded after the demodulation process of digitally controlled osci...
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IPC IPC(8): H03D7/16
Inventor 冯海英
Owner CRM ICBG (WUXI) CO LTD