CN201438728U - Quasi-separated dual-channel acoustic surface wave filter - Google Patents
Quasi-separated dual-channel acoustic surface wave filter Download PDFInfo
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- CN201438728U CN201438728U CN2009200438913U CN200920043891U CN201438728U CN 201438728 U CN201438728 U CN 201438728U CN 2009200438913 U CN2009200438913 U CN 2009200438913U CN 200920043891 U CN200920043891 U CN 200920043891U CN 201438728 U CN201438728 U CN 201438728U
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- interdigital transducer
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Abstract
The utility model discloses a quasi-separated dual-channel acoustic surface wave filter. In the technical scheme, the input end of a piezoelectric crystal substrate is provided with an image channel interdigital transducer and an audio channel interdigital transducer, the output end of the piezoelectric crystal substrate is provided with an image channel interdigital transducer and an audio channel interdigital transducer, an earthed shielding strip is arranged between the image channel interdigital transducer and the audio channel interdigital transducer at the input end and between the image channel interdigital transducer and the audio channel interdigital transducer at the output end, the image channel interdigital transducer at the output end and the audio channel interdigital transducer at the output end are equivalent finger type interdigital transducers, the image channel interdigital transducer and the audio channel interdigital transducer at the input end form a certain gap, and the gap is coated with a material with high sound loss. As the quasi-separated dual-channel acoustic surface wave filter is integrated on the piezoelectric crystal substrate, only one quasi-separated dual-channel acoustic surface wave filter can process image and audio signals. The utility model has the advantages of small size, low cost, low material consumption and the like, and also has great promotional value.
Description
Technical field:
The utility model patent relates to a kind of double-channel SAW filter, relates in particular to a kind of being integrated on the piezoelectric crystal substrate, can be at the quasi-separation dual-channel sound surface wave filter of image, sound channel filter action simultaneously.
Background technology:
Surface Acoustic Wave Filter is the critical elements of television set intermediate-frequency channel, the groundwork principle is to utilize the piezoelectric property of piezoelectric, utilize input and output transducer to convert the input signal of electric wave to mechanical energy, after treatment, again mechanical energy is converted to the signal of electricity, to reach the purpose of unnecessary signal of filtration and noise, lifting reception quality.
Because of television set has pair image and sound Presentation Function simultaneously, carry out conversion of signals so need employing that Surface Acoustic Wave Filter is handled in image, sound accompaniment respectively, in TV, use a vision intermediate frequency Surface Acoustic Wave Filter to add a sound intermediate frequency Surface Acoustic Wave Filter at present usually and come processing signals, just image, sound accompaniment are separated fully and carry out independent signal processing, use two acoustic surface wave filter devices not only on the television set wiring board area occupied bigger, and cost is also higher.
And along with recent years television set overall dimension towards ultra-thin direction develop, the integrated and price competition of height of mainboard, each manufacturer is in order to dwindle the mainboard size, to reduce the cost, also to take into account requirement to image, Television Sound Quality, therefore preferably can use an intermediate frequency acoustic surface wave filter device just can handle image, audio signal, just with image, the accurate wave filter that carries out signal processing that separates of sound accompaniment.
Summary of the invention:
The utility model patent provides a kind of and has been integrated on the piezoelectric crystal substrate at above the deficiencies in the prior art, can be at the quasi-separation dual-channel sound surface wave filter of image, sound channel filter action simultaneously.
For realizing the above object, the technical scheme that the utility model patent adopts is as follows:
Quasi-separation dual-channel sound surface wave filter, wherein input is provided with image channel interdigital transducer, sound channel interdigital transducer on the piezoelectric crystal substrate, output is provided with image channel interdigital transducer, sound channel interdigital transducer, is provided with the earth shield bar between input image channel interdigital transducer, sound channel interdigital transducer and output image channel interdigital transducer, the sound channel interdigital transducer.
The described input image channel interdigital transducer and the input sound channel interdigital transducer signal of telecommunication are imported a shared electrode P1.
Earth shield bar between described input, the output links to each other with the ground connection busbar H4 of two input interdigital transducer ground connection busbar H1, H2, H3 and output sound channel interdigital transducers, and a shared grounding electrode P2.
Described output image channel interdigital transducer is provided with busbar H5, H6, and is connected to the signal output pin through electrode P4, P5 respectively.
Described output sound channel interdigital transducer is provided with solder joint P3, and is connected to the signal output pin by lead-in wire.
Described output image channel interdigital transducer and output sound channel interdigital transducer for etc. refer to the type interdigital transducer.
Leave a fixed gap X between described input image channel interdigital transducer and the sound channel interdigital transducer.
Add on the X of space between described input image channel interdigital transducer and the sound channel interdigital transducer and be coated with material, the interference signal that produces when working simultaneously with the absorbing filter binary channels with high acoustic loss.
The utility model patent employing integrated quasi-separation dual-channel sound surface wave filter on same piezoelectric crystal substrate is realized the function of two filters, can handle image, audio signal simultaneously after being coated with the material with high acoustic loss adding on the space X between two input image channel interdigital transducers and the sound channel interdigital transducer, integral body has the consumption that reduces substrate material, reduces manufacture cost and other advantages.
Description of drawings:
Fig. 1 is the utility model patent planar structure sketch;
Fig. 2 is the utility model patent planar structure detail drawing;
Fig. 3 is the utility model patent image channel practical frequency response diagram;
Fig. 4 is the utility model patent sound channel practical frequency response diagram;
Embodiment:
As shown in Figure 1, the utility model patent mainly is made of the earth shield bar 6 that is integrated between input image channel interdigital transducer 2 on the piezoelectric crystal substrate 1, input sound channel interdigital transducer 3, output image channel interdigital transducer 4, output sound channel interdigital transducer 5, the input/output terminal.
As shown in Figure 2, input image channel interdigital transducer 2 and the shared electrode P1 of input sound channel interdigital transducer 3 input busbars, after the signal of telecommunication is transferred to input image channel interdigital transducer 2 and sound channel interdigital transducer 3 through electrode P1, input image channel interdigital transducer 2 and sound channel interdigital transducer 3 excite surface acoustic wave simultaneously, and be in running order.Earth shield bar 6 between the input/output terminal links to each other with the ground connection busbar H4 of two input interdigital transducer ground connection busbar H1, H2, H3 and output sound channel interdigital transducers 5, and a shared grounding electrode P2.The surface acoustic wave that output image channel interdigital transducer 4 receives from image channel interdigital transducer 2, and convert the signal of telecommunication to, through electrode P4, P5 output, so just finished the filter transmission function of image channel by busbar H5, H6, image channel practical frequency response diagram as shown in Figure 3.The surface acoustic wave that output sound channel interdigital transducer 5 receives from sound channel interdigital transducer 3, and convert the signal of telecommunication to, through electrode P3 output, so just finished the filter transmission function of sound channel, the response of sound channel practical frequency is shown in Figure 4.
Between input image channel interdigital transducer 2 and input sound channel interdigital transducer 3, leave certain space X, in filter manufacturing process, this space X need add the interference signal that produces when being coated with the material with high acoustic loss and working simultaneously with the absorbing filter binary channels.
The utility model is integrated quasi-separation dual-channel sound surface wave filter on same piezo-electric crystal substrate, make an one acoustic surface wave filter device just can process image, audio signal, have reduced volume, reduce cost, save the advantages such as consumptive material, have great promotional value.
Claims (5)
1. quasi-separation dual-channel sound surface wave filter, it is characterized in that: input is provided with image channel interdigital transducer, sound channel interdigital transducer on the described piezoelectric crystal substrate, output is provided with image channel interdigital transducer, sound channel interdigital transducer, is provided with the earth shield bar between input image channel interdigital transducer, sound channel interdigital transducer and output image channel interdigital transducer, the sound channel interdigital transducer.
2. quasi-separation dual-channel sound surface wave filter according to claim 1, it is characterized in that: the described input image channel interdigital transducer and the input sound channel interdigital transducer signal of telecommunication are imported a shared electrode (P1), earth shield bar between input, the output links to each other with the ground connection busbar (H4) of two input interdigital transducer ground connection busbars (H1), (H2), (H3) and output sound channel interdigital transducer, and a shared grounding electrode (P2).
3. quasi-separation dual-channel sound surface wave filter according to claim 1 is characterized in that: described output image channel interdigital transducer and output sound channel interdigital transducer for etc. refer to the type interdigital transducer.
4. quasi-separation dual-channel sound surface wave filter according to claim 1 is characterized in that: leave a fixed gap (X) between described two input image channel interdigital transducers and the sound channel interdigital transducer.
5. quasi-separation dual-channel sound surface wave filter according to claim 4 is characterized in that: add on the space (X) between described two input image channel interdigital transducers and the sound channel interdigital transducer and be coated with the material with high acoustic loss.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009200438913U CN201438728U (en) | 2009-05-26 | 2009-05-26 | Quasi-separated dual-channel acoustic surface wave filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009200438913U CN201438728U (en) | 2009-05-26 | 2009-05-26 | Quasi-separated dual-channel acoustic surface wave filter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201438728U true CN201438728U (en) | 2010-04-14 |
Family
ID=42400697
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009200438913U Expired - Fee Related CN201438728U (en) | 2009-05-26 | 2009-05-26 | Quasi-separated dual-channel acoustic surface wave filter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201438728U (en) |
-
2009
- 2009-05-26 CN CN2009200438913U patent/CN201438728U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100414 Termination date: 20120526 |