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Method and device for automatically switching digital audio broadcasting (DAB) signal and frequency modulation (FM) signal

A digital audio broadcasting, FM signal technology, applied in the direction of broadcasting/distributing the same information through multiple systems, power distribution switchgear, etc., can solve the problem of no automatic switching smoothing process, poor sound continuity effect, and no good estimated DAB Problems such as time difference with FM

Inactive Publication Date: 2013-01-30
HAIER BEIJING IC DESIGN
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Problems solved by technology

[0005] However, in some existing solutions for automatically switching between DAB signals and FM signals, the possible time difference between DAB and FM reception is not well estimated, and the automatic switching process is not smoothed. thus resulting in poor sound continuity

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  • Method and device for automatically switching digital audio broadcasting (DAB) signal and frequency modulation (FM) signal
  • Method and device for automatically switching digital audio broadcasting (DAB) signal and frequency modulation (FM) signal
  • Method and device for automatically switching digital audio broadcasting (DAB) signal and frequency modulation (FM) signal

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Embodiment Construction

[0041] The technical solutions of the present invention will be described in further detail below with reference to the accompanying drawings and embodiments.

[0042] Such as figure 1 As shown, it is a flow chart of the method for automatically switching DAB signals and FM signals in the present invention. figure 2 It is a structural schematic diagram of the device for automatically switching digital audio broadcasting signals and FM signals according to the present invention. Depend on figure 2 It can be seen that the device for automatically switching digital audio broadcasting signals and FM signals is composed of digital audio broadcasting signal (DAB) decoder 21, frequency modulation signal (FM) decoder 22, digital audio broadcasting signal buffer 23, FM signal buffer 24. Synchronous time calculator 25 and signal gate mixing controller 26 are formed. The device may also include a player 27 .

[0043] combine figure 1 with figure 2 , describe the method of the pr...

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Abstract

The invention relates to a method and device for automatically switching a digital audio broadcasting (DAB) signal and a frequency modulation (FM) signal. The method comprises the following steps of: decoding the DAB signal and the FM signal and caching; acquiring the time difference between a DAB decoded signal and a decoded FM signal according to the power of the decoded FM signal, the power ofthe DAB decoded signal and signal quality information; and selecting the DAB decoded signal or the decoded FM signal serving as a switching signal according to the signal quality information and the time difference, or mixing the DAB decoded signal with the decoded FM signal to obtain a switching signal. According to the method and the device, time different is calculated by using power for acquiring corresponding DAB signal and FM signal, and automatic switching is performed; moreover, smoothing is performed to make sound continuous in the process.

Description

technical field [0001] The invention relates to the field of broadcast signal switching, in particular to a method and device for automatically switching digital audio broadcast signals and frequency modulation signals by using time difference. Background technique [0002] Digital Audio Broadcasting (DAB for short) is the third generation of broadcasting—digital signal broadcasting—after AM and FM traditional analog broadcasting. Compared with traditional FM FM radio, it provides stereo sound quality similar to CD level, and has the characteristics of anti-interference and anti-wave attenuation in digital signal transmission. DAB radio is very suitable for use in intense mobile environments, such as vehicles. [0003] However, although the DAB standard is superior to FM in some aspects, due to its high carrier frequency, its signal penetration is poor, and in some places with serious occlusion, the signal is often not received, resulting in the inability to listen. At this...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04H20/22H04H20/26
Inventor 史岩
Owner HAIER BEIJING IC DESIGN
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