Non-coherent digital demodulation device for RDS signal

A digital demodulation and non-coherent technology, applied in the direction of digital transmission system, modulated carrier system, electrical components, etc., can solve the problems of complex design of phase error detector, high synchronization performance of system design, difficulty of filter loop, etc., to achieve Low design difficulty, reduce design difficulty, and save hardware resources

Inactive Publication Date: 2006-10-11
SHANGHAI CHENGSI MICROELECTRONICS
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Problems solved by technology

Therefore, the disadvantages of traditional coherent reception are:
[0019] First, the system design requires high synchronization performance;
[0020] Secondly, the phase error detector of the phase-locked loop has relatively complicated desi

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  • Non-coherent digital demodulation device for RDS signal
  • Non-coherent digital demodulation device for RDS signal
  • Non-coherent digital demodulation device for RDS signal

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[0048] The following describes the present invention in detail based on the drawings and examples:

[0049] according to figure 2 , image 3 with Figure 4 , RDS signal non-coherent digital demodulation device includes A / D sampler, 57KHz digital band pass filter, digital down converter, 57KHz numerically controlled oscillator, 2.4KHz low pass filter, residual carrier canceller, and its demodulation process As follows: First use the A / D sampler to sample the FM stereo baseband signal, then perform 57KHz band-pass filtering on the sampled signal, and then subject the filtered signal to quadrature demodulation and low-pass filtering to generate mutually orthogonal And the two I and Q near baseband signals with residual frequency offset, and finally the residual carrier canceller (1) removes the residual frequency offset and restores the RDS baseband signal.

[0050] Among them, the residual carrier canceller (1) is composed of a baseband signal amplitude calculator (11) and a baseban...

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Abstract

The non-coherent digital demodulation device for RDS signal to recover the RDS baseband signal without phase-locking comprises a ADC, a digital down converter, and a canceller for residual carrier with an amplitude calculator of CORDIC for baseband signal, and a symbol generator for baseband signal by comparing integration of I/Q signal and whether with same symbol.

Description

technical field [0001] The invention relates to a non-coherent digital demodulation device for RDS signals, especially the device can correctly receive demodulated output RDS baseband signals under the condition of no strict phase locking. Background technique [0002] The Radio Data System (RDS for short) uses the existing FM stereo radio station to add a digital spectrum modulated by Differential Binary Phase Shift Keying (DBPSK) to the 57KHz+ / -2Khz of its baseband spectrum. Multiplex transmission of broadcast information. [0003] The baseband signal is generated by the binary code stream through differential encoding, biphase encoding and waveform shaping, and double sideband amplitude modulation is performed on 57KHz to suppress the subcarrier, and is added to the baseband signal of FM stereo broadcasting. The RDS receiver must remove the subcarrier of the additional channel, extract the baseband signal, and then demodulate the baseband signal, extract the bit timing, ...

Claims

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Application Information

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IPC IPC(8): H04L27/233
Inventor 卢仰坚郑刚
Owner SHANGHAI CHENGSI MICROELECTRONICS
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