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Generation method and transmitting equipment for in band on channel (IBOC) digital/analog audio broadcast signals

A broadcast signal, in-band co-frequency technology, applied in the direction of broadcast information generation, simultaneous broadcast of multiple information, signal channels, etc., to save spectrum resources, eliminate mutual interference, and restore well

Active Publication Date: 2012-03-28
SHENZHEN SIKAIWEI ELECTRONICS CO LTD
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  • Summary
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  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

However, the full use of FM radio frequencies through FM digitization is a great supplement to FM radio

Method used

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  • Generation method and transmitting equipment for in band on channel (IBOC) digital/analog audio broadcast signals
  • Generation method and transmitting equipment for in band on channel (IBOC) digital/analog audio broadcast signals
  • Generation method and transmitting equipment for in band on channel (IBOC) digital/analog audio broadcast signals

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Embodiment Construction

[0046] Specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0047] Embodiment of a method for generating an audio broadcast signal of the same frequency in an aliasing band

[0048] The embodiment of the method for generating the same-frequency audio broadcast signal in the digital-analog time-domain mixing band is to mix the analog sound broadcast FM signal and the digital signal in a certain way in the time domain, and share one FM broadcast channel in the frequency domain. The specific production steps are as follows:

[0049] I. Obtain analog FM signal

[0050] The analog FM sound signal obtained by the audio source is expressed as m(t), f c is the FM carrier. FM modulated signal x FM Expressed as

[0051] x FM =cos[α(t)] ①

[0052] where α(t) is the phase function given by

[0053] α ( t ) = 2 π ...

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Abstract

The invention relates to a generation method and transmitting equipment for in band on channel (IBOC) digital / analog audio broadcast signals. The method comprises the following steps of: generating analog sound broadcast signals of time discrete; generating digital signals, and copying the digital signals in an adjacent signal frame; adding and subtracting the analog sound broadcast signals *2m, *2m + 1 and the corresponding digital broadcast signals in the adjacent signal frame, and acquiring *2m-dm and *2m + 1 + dm; and emitting acquired digital / analog mixed signals in the same broadcast channel. The transmitting equipment comprises an analog sound modulation module, a digital signal modulation module, a mixing module, a digital / analog converter, an upconversion module, a power amplifier and an antenna feeder system, wherein the mixing module comprises an adder and a subtractor so as to acquire the digital / analog mixed signals. According to the method and the equipment, analog / digital mixed signals with completely overlapped frequency spectrums are acquired, frequency bands are saved, and that a receiving end completely separates the digital / analog signals is facilitated.

Description

(1) Technical field [0001] The invention belongs to the technical field of digital audio broadcasting, and in particular relates to a generation method and a sending device of a Time Domain Overlapping-In Band On Channel (TDO-IBOC) digital-to-analog audio broadcasting signal. (2) Background technology [0002] AM (Amplitude Modulation, AM) broadcasting began in 1920, and FM (Frequency Modulation, FM) broadcasting began in 1940. In my country, from the 1950s to the 1960s, medium and short-wave broadcasting developed rapidly. In the 1970s, FM broadcasting rose rapidly, and the sound quality of broadcasting was significantly improved. FM broadcasting has been widely used. Although with the rapid development of TV, Internet, and mobile communication network, traditional audio broadcasting has once become a secondary important media method, and its development speed is far behind other major communication methods, but audio broadcasting has its specific application environment an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L5/02H04H60/07H04L27/26H04H20/30
Inventor 张豫伟黄建忠门爱东
Owner SHENZHEN SIKAIWEI ELECTRONICS CO LTD
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