Digital spectrum detection method for in-band on-channel (IBOC) system based on ear perception

A digital spectrum and detection method technology, applied in transmission systems, transmission monitoring, electrical components, etc., can solve problems such as a large number of idle spectrums, small bandwidth of analog FM signals, analog and digital signal spectrums, and large changes in audio quality.

Inactive Publication Date: 2013-03-13
苏州威士达信息科技有限公司 +1
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Problems solved by technology

[0010] However, since the spectral bandwidth of the FM analog signal varies with the program signal (such as frequency, amplitude), under a large time probability, the bandwidth of the analog FM signal is much smaller than the boundary bandwidth of the analog and dig

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  • Digital spectrum detection method for in-band on-channel (IBOC) system based on ear perception
  • Digital spectrum detection method for in-band on-channel (IBOC) system based on ear perception
  • Digital spectrum detection method for in-band on-channel (IBOC) system based on ear perception

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Embodiment Construction

[0032] The preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, so as to define the protection scope of the present invention more clearly.

[0033] Figure 4 The digital spectrum detection method of the IBOC system based on human ear perception is shown, which specifically includes the following steps:

[0034] The first step is to couple the analog FM signal with the digital signal according to the HD Radio hybrid mode, and obtain the demodulated analog audio signal at the demodulation end, in which the spectral bandwidth of the digital signal is fixed at 130KHZ to 200KHZ away from the carrier frequency;

[0035] The second step is to calculate the overall noise-masking ratio of the analog audio signal according to the PEAQ model, which is denoted as NMR_total, where the analog audio...

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Abstract

The invention discloses a digital spectrum detection method for an in-band on-channel (IBOC) system based on ear perception. By a high-definition (HD)-Radio system, in-band same-frequency transmission of an analog signal and a digital signal is realized; by the in-band same-frequency transmission mode, the digital signal is fixedly arranged at a position deviated from a carrier frequency of 130 to 200 KHZ; by a fixed combination mode, the digital signal is coupled with a frequency modulation (FM) analog signal; and the spectrum bandwidth of the FM analog signal is changed along with a program signal, so that the bandwidth change range is wide. Analog audio quality subjected to signal modulation under spectrum positions of different digital signals according to an international telecommunications union-radiocommunication (ITU-R) base station (BS).1387-1 psychological acoustics model, so that on the premise that the audio signal quality is not influenced, bandwidth which can be saved by signal transmission is counted; and the transmission capacity of the digital signals in the HD-Radio system can be improved.

Description

technical field [0001] The invention relates to a wireless communication system, in particular to a frequency spectrum detection method for an in-band co-frequency system. Background technique [0002] In the mixed mode of HD-Radio broadcasting, a fixed combination method is used to perform In-Band On-Channel (IBOC) transmission of analog and digital signal spectrums. However, since the spectral bandwidth of the FM analog signal varies with the program signal, the bandwidth varies widely. With a high probability of time, the bandwidth of the analog FM signal is much smaller than the boundary bandwidth of the analog and digital signal spectrum specified in the mixed mode. In this case, the real-time variation of the bandwidth of the analog signal results in a large amount of vacant spectrum. At the same time, since the spectral bandwidth occupied by the analog signal changes in real time, while the digital signal spectrum is fixed at the same spectral position, the audio qu...

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Application Information

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IPC IPC(8): H04B17/00
Inventor 王菲杨刚刘晋方伟伟蔡超时焦玮熊惟楚
Owner 苏州威士达信息科技有限公司
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