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

A psychoacoustic model and transmission method technology, applied in the direction of multi-frequency code system, etc., can solve the problems of great changes in audio quality, a large number of idle spectrums, and small bandwidths of analog FM signals, analog and digital signal spectrums, etc.

Inactive Publication Date: 2013-04-03
COMMUNICATION UNIVERSITY OF CHINA
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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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  • Psychoacoustic-model-based data transmission method of IBOC (in-band on-channel) system
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  • Psychoacoustic-model-based data transmission method of IBOC (in-band on-channel) system

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[0039] 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.

[0040] Figure 4 is a transmission block diagram showing the transmission end of the psychoacoustic model-based IBOC system according to the present invention. refer to Figure 4 , the sending method of the sending end of the IBOC system based on the psychoacoustic model includes the following steps:

[0041] The first step is to intercept the data of the analog audio signal to be sent by the sending end, and the length of the interception is 4096*n points, which is recorded as one frame, where n is a positive integer, and this signal is a reference signal;

[0042] The second step is to pass the reference signal through the HDRadio modulation ...

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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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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26
Inventor 方伟伟杨刚刘晋蔡超时王菲焦玮熊惟楚
Owner COMMUNICATION UNIVERSITY OF CHINA
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