CN201114432Y - A digit/analog integrator channel processing device - Google Patents
A digit/analog integrator channel processing device Download PDFInfo
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- CN201114432Y CN201114432Y CNU2007201723408U CN200720172340U CN201114432Y CN 201114432 Y CN201114432 Y CN 201114432Y CN U2007201723408 U CNU2007201723408 U CN U2007201723408U CN 200720172340 U CN200720172340 U CN 200720172340U CN 201114432 Y CN201114432 Y CN 201114432Y
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- 238000010897 surface acoustic wave method Methods 0.000 claims description 24
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Abstract
The utility model is suitable for the filed of signal processing and provides a channel processing device of a digital analogy multifunction. The devices comprises a tuner which outputs a first intermediate frequency signal after processing radio frequency signals received by an antenna; a acoustic surface filtering unit which is connected with the tuner and outputs a accompanying sound intermediate frequency signal tuned, a video intermediate frequency signal tuned or a digital intermediate frequency signal tuned; an intermediate frequency demodulator which is connected with the acoustic surface filtering unit and outputs a audio intermediate frequency signal, a video intermediate frequency signal and a narrowband digital intermediate frequency signal and a channel demodulating decoder which is connected with the intermediate frequency demodulator and outputs transport stream after demodulating the narrowband digital intermediate frequency signal. The channel processing device adopts discrete devices to reduce the production cost of the digital analogy multifunction. The two acoustic surface filtering units are connected between the tuner and the intermediate frequency demodulator and the audio part and the video part of analog signals are separated to filter, thereby reducing mutual interference and improving the quality of images.
Description
Technical field
The utility model belongs to the signal processing field, relates in particular to a kind of integrated analog/digital equipment Channel Processing device.
Background technology
At present, communication and developing rapidly of computer networking technology make the TV signal fully digitalization become an inexorable trend.By simulating to the transitional period of fully digitalization, simulated television still exists in TV signal, and integrated analog/digital equipment is a transition solution preferably.
As shown in Figure 1, in existing integrated analog/digital equipment, channel strip from antenna to master chip is mainly by tuner, devices such as if demodulator and channel demodulation decoder are formed, be responsible for reception, the demodulation sign indicating number of radio frequency analog and digital signal, transport stream, sound intermediate frequency/video if signal exported to master chip handle.Tuner and if demodulator generally integrate, and constitute integral high frequency head, the Voice ﹠ Video part separate processes in the analog signal can not be disturbed each other, cause picture quality not high.
Summary of the invention
The purpose of this utility model is to provide a kind of signal processing apparatus of integrated analog/digital equipment channel, be intended to solve in the prior art integral high frequency head when receiving digital signals and analog signal, video component and audio component can not separate processes in digital signal and analog signal and the analog signal, cause phase mutual interference between signal or the frequency component, the problem that picture quality is not high.
The utility model is achieved in that a kind of integrated analog/digital equipment Channel Processing device, and described device comprises:
Tuner, to the radiofrequency signal that receives through antenna amplify, vibration and mixing, export first intermediate-freuqncy signal;
Sound surface filtering unit is connected with described tuner, described first intermediate-freuqncy signal is carried out frequency-selecting handle, and exports modulated accompanying sound intermediate frequency signal, modulated video if signal or modulated digital medium-frequency signal;
If demodulator is connected with described sound surface filtering unit, described modulated accompanying sound intermediate frequency signal, modulated video if signal and modulated digital medium-frequency signal is carried out demodulation, output audio intermediate-freuqncy signal, video if signal and narrow-band digital intermediate-freuqncy signal; And
The channel demodulation decoder is connected with described if demodulator, to output transport stream after the demodulation of described narrow-band digital intermediate-freuqncy signal.
Another purpose of the utility model embodiment is to provide a kind of integrated analog/digital equipment, comprise antenna, master chip, and the channel strip between antenna and master chip, the radiofrequency signal that antenna receives is handled, signal after handling is exported to the Channel Processing device of master chip, and described Channel Processing device comprises:
Tuner, to the radiofrequency signal that receives through antenna amplify, vibration and mixing, export first intermediate-freuqncy signal;
Sound surface filtering unit is connected with described tuner, described first intermediate-freuqncy signal is carried out frequency-selecting handle, and exports modulated accompanying sound intermediate frequency signal, modulated video if signal or modulated digital medium-frequency signal;
If demodulator is connected with described sound surface filtering unit, described modulated accompanying sound intermediate frequency signal, modulated video if signal and modulated digital medium-frequency signal is carried out demodulation, output audio intermediate-freuqncy signal, video if signal and narrow-band digital intermediate-freuqncy signal; And
The channel demodulation decoder is connected with described if demodulator, to output transport stream after the demodulation of described narrow-band digital intermediate-freuqncy signal.
The utility model is by being connected two SAW (Surface Acoustic Wave) filter parallel between tuner and the if demodulator, will be from the digital and analog signaling intermediate frequency of tuner output or the audio component and the video component separate processes of analog signal intermediate frequency, reduce the phase mutual interference between signal or the frequency component, improved picture quality.
Description of drawings
Fig. 1 is that integrated analog/digital equipment and the Channel Processing device thereof that prior art provides formed structure.
Fig. 2 is the composition structure of the integrated analog/digital equipment that provides of the utility model.
Embodiment
In order to make the purpose of this utility model, technical scheme and advantage clearer,, the present invention is further elaborated below in conjunction with drawings and Examples.Should be appreciated that specific embodiment described herein only in order to explanation the present invention, and be not used in qualification the present invention.
In the utility model, tuner is separated with if demodulator, between tuner and if demodulator, increase by two SAW (Surface Acoustic Wave) filter, analog signal and digital signal intermediate frequency and analog signal sound intermediate frequency and video intermediate frequency part separate processes to tuner output, can reduce interference each other, improve picture quality.
Fig. 2 shows the composition structure of the integrated analog/digital equipment that the utility model provides, and for convenience of explanation, only shows the part relevant with the utility model.
After the radiofrequency signal that 2 pairs of antennas of Channel Processing device 1 receive is handled, export to master chip 3.
When the radiofrequency signal that receives when antenna 1 is analog signal, tuner 21 with antenna 1 receive that the radiofrequency signal of coming is amplified, vibration and mixing, form first intermediate-freuqncy signal.Because the audio-frequency unit of analog signal has different bandwidth with video section, after first intermediate-freuqncy signal outputed to surface filtering unit 22,22 pairs of described first intermediate-freuqncy signals in sound surface filtering unit were carried out frequency-selecting and are handled.Handle the outer out-of-band noise of the first intermediate-freuqncy signal sound intermediate frequency modulated medium frequency bandwidth of output by 21 pairs of analog radio-frequency signals of the first SAW (Surface Acoustic Wave) filter 22a filtering tuner, export modulated accompanying sound intermediate frequency signal, handle the outer out-of-band noise of video modulation intermediate-frequency bandwidth in first intermediate-freuqncy signal of exporting by 21 pairs of digital radio signals of rising tone surface wave filter 22b filtering tuner, export modulated video if signal.So far, the audio-frequency unit of analog signal has been realized accurate the separation with video section, can be by independent process.
In if demodulator 23, after the intermediate frequency amplifier amplification and further screening of modulated video if signal through if demodulator 23 inside, carry out amplitude limit, detection again, the final output video intermediate-freuqncy signal.The modulated audio intermediate-freuqncy signal exports master chip 3 together to and handles through obtaining sound intermediate frequency signal and video if signal after if demodulator 23 demodulation.
When the radiofrequency signal that receives when antenna 1 was digital signal, 21 pairs of antennas of tuner 1 received that the radiofrequency signal of coming is amplified, obtain first intermediate-freuqncy signal after vibration and the mixing.The bandwidth of this first intermediate-freuqncy signal and first SAW (Surface Acoustic Wave) filter 22a filtering characteristic coupling, therefore, have only the first SAW (Surface Acoustic Wave) filter 22a to allow signal to pass through, 21 pairs of digital radio signals of filtering tuner are handled the outer out-of-band noise of video modulation intermediate-frequency bandwidth in first intermediate-freuqncy signal of exporting, and obtain the narrow-band digital intermediate-freuqncy signal after handling through if demodulator 23.Output TS stream after the demodulation of 23 pairs of narrow-band digital intermediate-freuqncy signals of channel demodulation decoder, processing such as TS stream decompresses in master chip 3, demultiplexing and MPEG2 decoding.
In two embodiment of the present utility model, the first SAW (Surface Acoustic Wave) filter 22a is a SAW (Surface Acoustic Wave) filter with rectangle band-pass filtering property, the intermediate frequency characteristics that meets modulated digital medium-frequency signal and modulated accompanying sound intermediate frequency signal, therefore, can the shared first SAW (Surface Acoustic Wave) filter 22a through the audio-frequency unit of first intermediate-freuqncy signal of the digital signal of tuner 21 output and analog signal, only allow to pass through other frequency components of filtering and out-of-band noise with the frequency component of its bandwidth match.
Because the first SAW (Surface Acoustic Wave) filter 22a has different filtering characteristics with rising tone surface wave filter 22b, so, when receiving digital signals and analog signal, the digital intermediate frequency of tuner 21 outputs and the video component of analog intermediate frequency can be separated at the same time, thus minimizing interference each other.
Because above-mentioned device separates physically, as one embodiment of the present of invention, the device through part that this device comprised can be deployed in printed circuit board (PCB) (Printed Circuits Board, PCB) on, physical connection between each device is on the same surface of pcb board, and the channel at this device place is surrounded by the ground wire that goes in ring.
The utility model has reduced the production cost of integrated analog/digital equipment by adopting discrete device.Two SAW (Surface Acoustic Wave) filter of parallel connection between tuner and if demodulator, except reducing the interference between digital signal and analog signal, the audio-frequency unit and the video section separate processes of analog signal can also be reduced interference each other, improve picture quality.Simultaneously, discrete device can be deployed on the PCB by through part, and the physical connection between the device is on the same surface of PCB, and channel is surrounded by the ground wire that goes in ring, make " loop stream to " active path minimum of signal, reduced phase mutual interference and noise crosstalking between the signal effectively signal.
The above only is preferred embodiment of the present utility model; not in order to restriction the utility model; all any modifications of within spirit of the present utility model and principle, being done, be equal to and replace and improvement etc., all should be included within the protection range of the present utility model.
Claims (10)
1, a kind of integrated analog/digital equipment Channel Processing device is characterized in that described device comprises:
Tuner, to the radiofrequency signal that receives through antenna amplify, vibration and mixing, export first intermediate-freuqncy signal;
Sound surface filtering unit is connected with described tuner, described first intermediate-freuqncy signal is carried out frequency-selecting handle, and exports modulated accompanying sound intermediate frequency signal, modulated video if signal or modulated digital medium-frequency signal;
If demodulator is connected with described sound surface filtering unit, described modulated accompanying sound intermediate frequency signal, modulated video if signal and modulated digital medium-frequency signal is carried out demodulation, output audio intermediate-freuqncy signal, video if signal and narrow-band digital intermediate-freuqncy signal; And
The channel demodulation decoder is connected with described if demodulator, to output transport stream after the demodulation of described narrow-band digital intermediate-freuqncy signal.
2, device as claimed in claim 1 is characterized in that, described sound surface filtering unit comprises:
First SAW (Surface Acoustic Wave) filter, be used for the described tuner of filtering and analog radio-frequency signal handled the outer out-of-band noise of the first intermediate-freuqncy signal sound intermediate frequency modulated medium frequency bandwidth of output, export modulated accompanying sound intermediate frequency signal, and the out-of-band noise in first intermediate-freuqncy signal of filtering digital radio signal correspondence, export modulated digital medium-frequency signal; And
Rising tone surface wave filter is used for the described tuner of filtering digital radio signal is handled the outer out-of-band noise of exporting of the first intermediate-freuqncy signal video modulation intermediate-frequency bandwidth, exports modulated video if signal.
3, device as claimed in claim 1 is characterized in that, described tuner, sound surface filtering unit, if demodulator, and channel demodulation decoder through part is deployed on the pcb board.
4, device as claimed in claim 3 is characterized in that, described tuner, sound surface filtering unit, if demodulator, and the physical connection between the channel demodulation decoding is deployed in the same surface of pcb board.
As claim 3 or 4 described devices, it is characterized in that 5, described device is surrounded by the ground wire that goes in ring on the pcb board.
6, a kind of integrated analog/digital equipment comprises antenna, master chip, and the channel strip between antenna and master chip, the radiofrequency signal that antenna receives is handled, the signal after handling is exported to the Channel Processing device of master chip, it is characterized in that described Channel Processing device comprises:
Tuner, to the radiofrequency signal that receives through antenna amplify, vibration and mixing, export first intermediate-freuqncy signal;
Sound surface filtering unit is connected with described tuner, described first intermediate-freuqncy signal is carried out frequency-selecting handle, and exports modulated accompanying sound intermediate frequency signal, modulated video if signal or modulated digital medium-frequency signal;
If demodulator is connected with described sound surface filtering unit, described modulated accompanying sound intermediate frequency signal, modulated video if signal and modulated digital medium-frequency signal is carried out demodulation, output audio intermediate-freuqncy signal, video if signal and narrow-band digital intermediate-freuqncy signal; And
The channel demodulation decoder is connected with described if demodulator, to output transport stream after the demodulation of described narrow-band digital intermediate-freuqncy signal.
7, integrated analog/digital equipment as claimed in claim 6 is characterized in that, described sound surface filtering unit comprises:
First SAW (Surface Acoustic Wave) filter, be used for the described tuner of filtering and analog radio-frequency signal handled the frequency component and the voiced band external noise of the first intermediate-freuqncy signal video section of output, export modulated accompanying sound intermediate frequency signal, and the out-of-band noise in first intermediate-freuqncy signal of filtering digital radio signal correspondence, export modulated digital medium-frequency signal; And
Rising tone surface wave filter is used for the described tuner of filtering digital radio signal is handled first intermediate-freuqncy signal sound intermediate frequency frequency component and the video out-of-band noise of exporting partly, exports modulated video if signal.
8, integrated analog/digital equipment as claimed in claim 6 is characterized in that, described tuner, sound surface filtering unit, if demodulator, and channel demodulation decoder through part is deployed on the pcb board.
9, integrated analog/digital equipment as claimed in claim 8 is characterized in that, described tuner, sound surface filtering unit, if demodulator, and the physical connection between the channel demodulation decoding is deployed in the same surface of pcb board.
10, integrated analog/digital equipment as claimed in claim 8 or 9 is characterized in that, described Channel Processing device is surrounded by the ground wire that goes in ring on the pcb board.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007201723408U CN201114432Y (en) | 2007-09-30 | 2007-09-30 | A digit/analog integrator channel processing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007201723408U CN201114432Y (en) | 2007-09-30 | 2007-09-30 | A digit/analog integrator channel processing device |
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| Publication Number | Publication Date |
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| CN201114432Y true CN201114432Y (en) | 2008-09-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2007201723408U Expired - Fee Related CN201114432Y (en) | 2007-09-30 | 2007-09-30 | A digit/analog integrator channel processing device |
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| Country | Link |
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| CN (1) | CN201114432Y (en) |
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2007
- 2007-09-30 CN CNU2007201723408U patent/CN201114432Y/en not_active Expired - Fee Related
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20080910 Termination date: 20110930 |