Psychoacoustic-model-based data transmission method of IBOC (in-band on-channel) system

Abstract

The invention discloses a psychoacoustic-model-based data transmission method of an IBOC (in-band on-channel) system. The method comprises the steps of putting digital signal frequency spectrums in different spectrum positions based on an ITU-R BS.1387-1 psychoacoustic model, and analyzing the quality of a received analogue audio, thus obtaining an empirical curve between a noise to mask ratio (NMR) of an analogue audio program and a spectrum position Fstart of a digital signal to dynamically determine the spectrum position of a digital signal corresponding to each frame data which is transmitted according to the NMR of each frame data calculated in real time and the known NMR-Fstart curve so as to guide a sub-carrier number of digital signal transmission. The data transmission method aims at improving an available spectrum of the digital signal and boosting the transmitting capacity of the digital signal in a hybrid mode on the premise of ensuring of the uniform feel of human ears to the frame data.

Description

technical field [0001] The invention relates to a wireless communication system, in particular to a data sending method of 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 quality heard by th...

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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 digital signal spectrum specified in the standard

In this case, the real-time variation of the bandwidth of the analog signal not only results in a large amount of empty spectrum, but also results in a large variation in the audio quality heard by the human ear over time

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