CN101521550B - Embedded multimedia system and its related digital broadcast demodulation device - Google Patents

Abstract

An embedded multimedia system and its related digital broadcast demodulation device are used to play analog and digital audio broadcast signals. The embedded multimedia system includes an antenna for receiving analog and digital audio broadcast signals; a sound output device for outputting sound; an analog broadcast demodulation device for demodulating analog audio broadcast signals to output sound through the sound output device; and a digital broadcast demodulation device coupled to the antenna and the analog broadcast demodulation device, and used to conduct the signal connection from the antenna to the analog broadcast demodulation device, or convert the digital audio broadcast signal into an analog audio broadcast signal and output it to the analog broadcast demodulation device according to the operation mode of the embedded multimedia system.

Description

Embedded multimedia system and related digital broadcasting demodulating device thereof

Technical field

The present invention relates to a kind of embedded multimedia system and related digital broadcasting demodulating device thereof, relate in particular to a kind of embedded multimedia system and related digital broadcasting demodulating device thereof of playing simulation and digital broadcasting.

Background technology

Digital audio broadcasting (Digital Audio Broadcasting; DAB), or claiming high definition radio (HighDefinition Radio) technology, is the third generation broadcasting after amplitude modulation, FM broadcasting; It can be through preferable frequency spectrum service efficiency; Solve the problem that broadcasting station channel for a long time obtains difficulty, simultaneously as a tonequality as the CD and the additional all items of a data, services function, also can satisfy people for the broadcast medium multiple demands.Therefore, digital audio broadcasting has the trend that replaces analog broadcasting.

The employed correlation technique of digital audio broadcast system (like modulation, coding) has very big difference with traditional amplitude modulation, frequency modulation broadcast system, and therefore, traditional amplitude modulation, FM broadcasting demodulator (broadcast receiver) can't be applicable to digital audio broadcast system.In other words, the user need buy a demodulator for demodulating digital broadcast signals, begins to listen to digital broadcast program.Yet for the motor multimedia system, the user can't listen to digital broadcast program onboard through the mode of changing demodulator for demodulating digital broadcast signals, causes the inconvenience in the use.

In brief, because the motor multimedia system combination in car shell, interior dress, causes the user can't change broadcast demodulator easily, thereby can't listen to digital broadcast program.

Summary of the invention

Therefore, the present invention provides a kind of embedded multimedia system and related digital broadcasting demodulating device thereof.

The present invention discloses a kind of digital broadcasting demodulation apparatus that is used for an embedded multimedia system; This embedded multimedia system comprises the analog broadcasting demodulating equipment that an antenna and is used for playing the analogue audio frequency broadcast singal; This digital broadcasting demodulation apparatus includes a digital broadcasting modular converter, includes an input and an output, receives digital audio broadcasting signal with this input of cause; And after converting the analogue audio frequency broadcast singal into, by this output output; And all die change pieces, include one first end, be coupled to this antenna; One second end is coupled to this analog broadcasting demodulating equipment; One the 3rd end is coupled to this output of this digital broadcasting modular converter; One the 4th end is coupled to this input of this digital broadcasting modular converter; An and switching unit; Be coupled to this first end, this second end, the 3rd end and the 4th end; Be used for operator scheme according to this embedded multimedia system; The signal of this first end of conducting to this second end connects, or the signal of this first end of conducting to the 4th end connects and the signal of the 3rd end to this second end connects.

The present invention also discloses a kind of embedded multimedia system, and in order to play simulation and digital audio broadcasting signal, it includes an antenna, is used for receiving simulation and digital audio broadcasting signal; One voice output is used for output sound; One analog broadcasting demodulating equipment is used for demodulation analogue audio frequency broadcast singal, with through this voice output output sound; An and digital broadcasting demodulation apparatus; Be coupled to this antenna and this analog broadcasting demodulating equipment; Be used for operator scheme according to this embedded multimedia system; The signal of this antenna of conducting to this analog broadcasting demodulating equipment connects, or digital audio broadcasting signal is converted into the analogue audio frequency broadcast singal and exports this analog broadcasting demodulating equipment to.

Description of drawings

Fig. 1 is an embedded multimedia system of the embodiment of the invention.

Fig. 2 is the preferred embodiment sketch map of digital broadcasting demodulation apparatus among Fig. 1.

Fig. 3 is the preferred embodiment sketch map of switch unit among Fig. 2.

The primary clustering symbol description:

10 embedded multimedia systems

100 antennas

102 voice outputs

104 analog broadcasting demodulating equipments

106 digital broadcasting demodulation apparatus

200 digital broadcasting modular converters

202 handover modules

204 first ends

206 second ends

208 the 3rd ends

210 the 4th ends

212 switch units

30 first switches

32 second switches

300,302,304,306,308,310 signal ends

Embodiment

Please refer to Fig. 1, Fig. 1 is the sketch map of the embodiment of the invention one embedded multimedia system 10.Embedded multimedia system 10 preferably is a motor multimedia Play System, and it includes an antenna 100, a voice output 102, an analog broadcasting demodulating equipment 104, a digital broadcasting demodulation apparatus 106.Antenna 100 is used for receiving simulation and digital audio broadcasting signal.Digital broadcasting demodulation apparatus 106 is coupled between antenna 100 and the analog broadcasting demodulating equipment 104; Be used for operator scheme according to embedded multimedia system 10; The signal of conducting antenna 100 to analog broadcasting demodulating equipment 102 connects, or digital audio broadcasting signal is converted into the analogue audio frequency broadcast singal and exports analog broadcasting demodulating equipment 104 to.Analog broadcasting demodulating equipment 104 is coupled to digital broadcasting demodulation apparatus 106, is used for demodulation analogue audio frequency broadcast singal, with through voice output 102 output sounds.

Therefore, through embedded multimedia system 10, when the user will listen to the analog broadcasting program, but the signal of digital broadcasting demodulation apparatus 106 conducting antenna 100 to analog broadcasting demodulating equipments 102 connects.And when the user will listen to digital broadcast program; 106 of digital broadcasting demodulation apparatus convert digital audio broadcasting signal into the analogue audio frequency broadcast singal; Make analog broadcasting demodulating equipment 104 further to handle, to play the content of digital broadcast program through voice output 102.

As previously mentioned, because the motor multimedia system combination in car shell, interior dress, causes the user can't change broadcast demodulator easily, so that can't listen to digital broadcast program.Under this situation, through the present invention, the user only needs between antenna 100 and analog broadcasting demodulating equipment 104, to increase digital broadcasting demodulation apparatus 106, then can listen to simulation and digital broadcast program.

What pay special attention to is, the sketch map that is merely the embodiment of the invention shown in Figure 1, and those of ordinary skills should do different modifications according to this.For instance, please refer to Fig. 2, Fig. 2 is the preferred embodiment sketch map of digital broadcasting demodulation apparatus 106 among Fig. 1.Digital broadcasting demodulation apparatus 106 includes a digital broadcasting modular converter 200 and all die change pieces 202.Digital broadcasting modular converter 200 is used for receiving digital audio broadcasting signal and converts the analogue audio frequency broadcast singal into.Handover module 202 includes one first end 204, one second end 206, one the 3rd end 208, one the 4th end 210 and a switching unit 212.First end 204 is coupled to antenna 100, the second ends 206 and is coupled to the output that analog broadcasting demodulating equipment 104, the three ends 208 are coupled to digital broadcasting modular converter 200, and the 4th end 210 is coupled to the input of digital broadcasting modular converter 200.Switch unit 212 is coupled to first end 204, second end 206, the 3rd end 208 and the 4th end 210; Be used for operator scheme according to embedded multimedia system 10; The signal of conducting first end 204 to second ends 206 connects, or the signal of conducting first end 204 to the 4th ends 210 connects and the signal of the 3rd end 208 to second ends 206 connects.For example, when embedded multimedia system 10 operated in the analog broadcasting play mode, the signal of switch unit 212 conductings first end 204 to second ends 206 connected; And when embedded multimedia system 10 operated in the digital broadcasting play mode, then the signal of connection of the signal of switch unit 212 conductings first end 204 to the 4th ends 210 and the 3rd end 208 to second ends 206 connected.Thus, the user can listen to simulation and digital broadcast program through embedded multimedia system 10.

Please continue with reference to figure 3, Fig. 3 is the preferred embodiment sketch map of switch unit 212 among Fig. 2.Switch unit 212 includes one first switch 30 and a second switch 32, the first switches 30 and second switch 32 and is all three end assemblies, includes signal end 300,302,304 and signal end 306,308,310 respectively.First switch 30 and second switch 32 are synchronous diverter switch, that is when signal end 300 and signal end 304 conductings, signal end 308 and also conducting of signal end 306.In other words, when embedded multimedia system 10 operates in the analog broadcasting play mode, signal end 300 and signal end 302 conductings, signal end 308 then with signal end 310 conductings of suspension joint, making the end 204 of winning be coupled to second end 206.When embedded multimedia system 10 operated in the digital broadcasting play mode, then synchronous and signal end 306 conductings of signal end 300 and signal end 304 conductings, signal end 308 making the end 204 of winning be coupled to the 4th end 210, the three ends 208 and being coupled to second end 206.Thus, the user can listen to simulation and digital broadcast program through embedded multimedia system 10.

What pay special attention to is that Fig. 1 to Fig. 3 is that those of ordinary skills should do different variations according to this, and are not limited thereto in order to explanation the present invention.

In sum, to the embedded multimedia system of only supporting analog broadcasting, like the motor multimedia system; The present invention need not change the assembly of original system, only needs to do to revise promptly extendible its function by a small margin; Make it can play simulation and digital broadcasting; Not only can keep the function of original motor multimedia system, and need not revise significantly, to keep adorn in the car complete.

The above is merely preferred embodiment of the present invention, and all equivalent variations and modifications of being done according to claims scope of the present invention all should belong to covering scope of the present invention.

Claims (7)

1. A digital broadcast demodulator for an embedded multimedia system, said embedded multimedia system comprising an antenna and an analog broadcast demodulator for demodulating analog audio broadcast signals, said digital broadcast demodulator The device is coupled between the antenna and the analog broadcast demodulation device, and the digital broadcast demodulation device includes: A digital broadcast conversion module, including an input terminal and an output terminal, used to convert the digital audio broadcast signal received by the input terminal into an analog audio broadcast signal and output it through the output terminal; and A switching module, comprising: a first end, coupled to the antenna; a second terminal, coupled to the analog broadcast demodulation device; a third terminal, coupled to the output terminal of the digital broadcast conversion module; a fourth end, coupled to the input end of the digital broadcast conversion module; and A switch unit, coupled to the first end, the second end, the third end and the fourth end, is used to guide the embedded multimedia system when it is operating in an analog broadcast mode through the signal connection from the first end to the second end, or when the embedded multimedia system operates in a digital broadcast playing mode, conduct the signal connection from the first end to the fourth end and the A signal connection from the third end to the second end. 2. The digital broadcast demodulation device according to claim 1, wherein the switching unit comprises: a first switch, including a first signal terminal coupled to the first terminal, a second signal terminal coupled to the second terminal, and a third signal terminal coupled to the fourth terminal, The first switch is used to conduct the signal connection between the first signal end and the second signal end when the embedded multimedia system is operating in the analog broadcasting mode, or when the embedded multimedia system When operating in the digital broadcast playing mode, turn on the signal connection between the first signal terminal and the third signal terminal; and A second switch, including a fourth signal terminal coupled to the third terminal, a fifth signal terminal coupled to the second terminal, and a floating sixth signal terminal, the second switch uses When the first signal end of the first switch is turned on with the second signal end, the signal connection from the fifth signal end to the floating sixth signal end is turned on, or when the When the first signal end and the third signal end of the first switch are turned on, the signal connection from the fourth signal end to the fifth signal end is turned on. 3. The digital broadcast demodulation device as claimed in claim 1, wherein the embedded multimedia system is a vehicle multimedia playback system. 4. An embedded multimedia system for playing analog and digital audio broadcasting signals, said embedded multimedia system comprising: An antenna for receiving analog and digital audio broadcasting signals; A sound output device, used to output sound; An analog broadcast demodulation device for demodulating an analog audio broadcast signal to output sound through said sound output device; and A digital broadcast demodulation device, coupled between the antenna and the analog broadcast demodulation device, is used to connect the antenna to the The signal connection of the analog broadcast demodulation device, or when the embedded multimedia system operates in a digital broadcast playback mode, convert the digital audio broadcast signal into an analog audio broadcast signal and output it to the analog broadcast demodulation device. 5. The embedded multimedia system as claimed in claim 4, wherein said digital broadcast demodulation device comprises: A digital broadcast conversion module, including an input terminal and an output terminal, used to convert the digital audio broadcast signal received by the input terminal into an analog audio broadcast signal and output it through the output terminal; and A switching module, comprising: a first end, coupled to the antenna; a second terminal, coupled to the analog broadcast demodulation device; a third terminal, coupled to the output terminal of the digital broadcast conversion module; a fourth end, coupled to the input end of the digital broadcast conversion module; and a switching unit, coupled to the first terminal, the second terminal, the third terminal and the fourth terminal, for when the embedded multimedia system is operating in the analog broadcast playing mode, turn on the signal connection from the first end to the second end, or turn on the signal connection from the first end to the fourth end when the embedded multimedia system is operating in the digital broadcast playing mode and A signal connection from the third end to the second end. 6. The embedded multimedia system as claimed in claim 5, wherein said switching unit comprises: A first switch, including a first signal terminal coupled to the first terminal, a second signal terminal coupled to the second terminal, and a third signal terminal coupled to the fourth terminal, The first switch is used to conduct the signal connection between the first signal end and the second signal end when the embedded multimedia system is operating in the analog broadcasting mode, or when the embedded multimedia system When operating in the digital broadcast playing mode, turn on the signal connection between the first signal terminal and the third signal terminal; and A second switch, including a fourth signal terminal coupled to the third terminal, a fifth signal terminal coupled to the second terminal, and a floating sixth signal terminal, the second switch uses When the first signal end of the first switch is turned on with the second signal end, the signal connection from the fifth signal end to the floating sixth signal end is turned on, or when the When the first signal end and the third signal end of the first switch are turned on, the signal connection from the fourth signal end to the fifth signal end is turned on. 7. The embedded multimedia system according to claim 4, said embedded multimedia system is a vehicle multimedia playing system.

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