CN101674396A - Set top box with function of frequency modulation (FM) radio and operating method thereof - Google Patents
Set top box with function of frequency modulation (FM) radio and operating method thereof Download PDFInfo
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- CN101674396A CN101674396A CN200910308929A CN200910308929A CN101674396A CN 101674396 A CN101674396 A CN 101674396A CN 200910308929 A CN200910308929 A CN 200910308929A CN 200910308929 A CN200910308929 A CN 200910308929A CN 101674396 A CN101674396 A CN 101674396A
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- 230000003321 amplification Effects 0.000 claims description 13
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- 230000010355 oscillation Effects 0.000 claims description 13
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Abstract
The invention relates to the technology of a set top box, aiming at solving the problem that the existing set top box has no function of a frequency modulation (FM) radio. The invention provides a settop box with the function of the FM radio and an operating method thereof. The technical scheme comprises: the set top box with the function of the FM radio is provided with a signal input end whichis connected with a band-pass filter module that is connected with a radio module, the radio module is connected with an audio switching module and a microprocessor, the audio switching module is connected with the microprocessor, an audio operation amplifier module is connected with the audio switching module, and an audio output end is connected with the audio operation amplifier module. The invention has the advantages of being convenient for the user to use and applicable to various set top boxes.
Description
Technical field
The present invention relates to set-top box technique, particularly realize the technology of FM receiver function in the set-top box.
Background technology
Along with the development of Digital Television, the user is more and more higher for the acceptance level of digital TV set-top box, popularizes gradually in some city digital TV set-top box.The Digital Television epoch have been realized set-top box of a television set adapted, and the user need watch program just to need to guarantee periodic payment license fee every month, if in case expire and do not pay license fee then just can't watch ciphered program.If at this moment the user can listen to local broadcast program, also is a kind of enjoyment.Simultaneously a lot of people are accustomed to television set being opened " listening " television set on one side, Yi Bian do other thing, iff being to have only voice output, need not consider the content of video output, also do not influence user's use.
Summary of the invention
Technical problem to be solved by this invention does not have the shortcoming of FM receiver function in order to overcome present set-top box exactly, and a kind of set-top box and operation method thereof with FM receiver function is provided.
The present invention solves its technical problem, the technical scheme that adopts is, the set-top box of band FM receiver function, comprise the set-top box body, the set-top box body comprises microprocessor, signal input part, audio operational amplifying circuit and audio output, audio output is connected with the audio operational amplification module, it is characterized in that, also comprise bandpass filtering modules block, the radio reception module, audio frequency handover module and audio operational amplification module, described signal input part is connected with bandpass filtering modules block, bandpass filtering modules block is connected with the radio reception module, the radio reception module is connected with the audio frequency handover module, the radio reception module is connected with microprocessor, and the audio frequency handover module is connected with microprocessor, and the audio operational amplification module is connected with the audio frequency handover module.
Concrete, described radio reception module comprises low noise amplifier circuit, quadrature mixting circuit, intermediate frequency amplifier circuit, demodulator circuit and Voltage-Controlled oscillation circuit, described low noise amplifier circuit is connected with bandpass filtering modules block, the quadrature mixting circuit is connected with low noise amplifier circuit, intermediate frequency amplifier circuit is connected with the quadrature mixting circuit, demodulator circuit is connected with intermediate frequency amplifier circuit, demodulator circuit is connected with the audio frequency handover module, Voltage-Controlled oscillation circuit is connected with the quadrature mixting circuit, and Voltage-Controlled oscillation circuit is connected with microprocessor.
Further, described bandwidth-limited circuit adopts the 87-107MHz band pass filter.
The operation method of the set-top box of band FM receiver function is characterized in that, may further comprise the steps:
A. user's selector top box enters radio-receiving mode;
B. set-top-box system is closed the audio frequency output of Digital Television, utilizes the audio frequency handover module to switch to the audio frequency output of radio reception module, judges whether the user keeps television video frequency signal, if then enter the c step, if not then enter the d step;
C. continue to keep existing video signal, enter the e step;
D. close existing video, the standby of set-top box video decode part;
E. set-top-box system shows the radio reception menu to the user;
F. after selecting to search corresponding radio station according to the user, the user normally listens to;
G. the user selects to withdraw from radio-receiving mode;
H. set-top-box system reduces the audio frequency and video output of former Digital Television.
Further, further comprising the steps of between steps d and the step e:
I. judge whether the user selects static images to show, if then enter the j step, if not then enter the k step;
J. show static images, and enter the e step;
K. do not have video output, and enter the e step.
The invention has the beneficial effects as follows, set-top box and operation method thereof by above-mentioned band FM receiver function can make set-top box possess the function of FM receiver, and because when carrying out function of radio receiver, can not carry out the video and audio signal decoding of digital television signal, power consumption is very low, make things convenient for the user, enhance one's market competitiveness.
Description of drawings
Fig. 1 is the system block diagram of embodiment;
Fig. 2 is the system flow chart of embodiment operation method.
Embodiment
Below in conjunction with drawings and Examples, describe technical scheme of the present invention in detail.
The invention provides a kind of set-top box with FM receiver function, be connected with bandpass filtering modules block by signal input part, bandpass filtering modules block is connected with the radio reception module, the radio reception module is connected with the audio frequency handover module, the radio reception module is connected with microprocessor, the audio frequency handover module is connected with microprocessor, the audio operational amplification module is connected with the audio frequency handover module, audio output and audio operational amplification module connect to form, its operation method is: at first user's selector top box enters radio-receiving mode, then set-top-box system is closed the audio frequency output of Digital Television, utilize the audio frequency handover module to switch to the audio frequency output of radio reception module, judge whether the user keeps television video frequency signal, if then continue to keep existing video signal, if not then close existing video, the standby of set-top box video decode part, set-top-box system shows the radio reception menu to the user then, after selecting to search corresponding radio station according to the user, the user normally listens to, if the user selects to withdraw from radio-receiving mode, set-top-box system reduces the audio frequency and video output of former Digital Television.
Embodiment
This routine bandwidth-limited circuit adopts 87-107MHz band pass filter, its system block diagram such as Fig. 1, the system flow chart of operation method such as Fig. 2.
At first be connected with bandpass filtering modules block by signal input part, bandpass filtering modules block is connected with the radio reception module, the radio reception module is connected with the audio frequency handover module, the radio reception module is connected with microprocessor, the audio frequency handover module is connected with microprocessor, the audio operational amplification module is connected with the audio frequency handover module, audio output and audio operational amplification module connect to form the set-top box of band FM receiver function, wherein, the radio reception module is connected with bandpass filtering modules block by low noise amplifier circuit, the quadrature mixting circuit is connected with low noise amplifier circuit, intermediate frequency amplifier circuit is connected with the quadrature mixting circuit, and demodulator circuit is connected with intermediate frequency amplifier circuit, and demodulator circuit is connected with the audio frequency handover module, Voltage-Controlled oscillation circuit is connected with the quadrature mixting circuit, and Voltage-Controlled oscillation circuit and microprocessor connect to form.
When the user enters radio-receiving mode, at first, the set-top box microprocessor sends instruction to Voltage-Controlled oscillation circuit, Voltage-Controlled oscillation circuit is modulated at suitable frequency, simultaneously, the FM radio reception module that is outputted to of audio switch is exported by IIC or logic control, after RF signal (radiofrequency signal) input, at first enter the 87-107MHz band pass filter, useful FM signal is leached, remove other interference signal simultaneously, as normal cable TV signal, this signal enters low noise amplifier then, and the signal attenuation that the compensating band bandpass filter brings enters orthogonal mixer then, carry out mixing with the fixed frequency signal of Voltage-Controlled oscillation circuit output, at this moment, the set-top box microprocessor is the control Voltage-Controlled oscillation circuit constantly, produces different frequency output, carry out the search in radio station, in case the user finds suitable radio station, promptly fixed frequency produces intermediate-freuqncy signal, in general for being fixed as 10.7MHz, the intermediate-freuqncy signal of output is once amplified again, enters demodulator, solves normal stereo audio signal.Simultaneously, the audio signal of output enters the audio operational amplification module and carries out power amplification through audio switch, exports to television set at last.
Wherein, audio operational amplification module, microprocessor etc. are the original part of set-top box, and the parts for realizing that the utility model increased newly such as 87-107MHz band pass filter, radio reception module, audio switch.The low noise amplifier that comprises in the FM radio reception module, orthogonal mixer, Voltage-Controlled oscillation circuit, intermediate frequency amplifier, demodulator etc. are existing mature technology, can be integrated into an independent chip internal during realization, form an independent module, as the TEA5760 broadcast receiver chip of NXP company.
Claims (5)
1. be with the set-top box of FM receiver function, comprise the set-top box body, the set-top box body comprises microprocessor, audio operational amplifying circuit and audio output, audio output is connected with the audio operational amplification module, it is characterized in that, also comprise signal input part, bandpass filtering modules block, the radio reception module, audio frequency handover module and audio operational amplification module, described signal input part is connected with bandpass filtering modules block, bandpass filtering modules block is connected with the radio reception module, the radio reception module is connected with the audio frequency handover module, the radio reception module is connected with microprocessor, and the audio frequency handover module is connected with microprocessor, and the audio operational amplification module is connected with the audio frequency handover module.
2. according to the set-top box of the described band FM receiver function of claim 1, it is characterized in that, described radio reception module comprises low noise amplifier circuit, the quadrature mixting circuit, intermediate frequency amplifier circuit, demodulator circuit and Voltage-Controlled oscillation circuit, described low noise amplifier circuit is connected with bandpass filtering modules block, the quadrature mixting circuit is connected with low noise amplifier circuit, intermediate frequency amplifier circuit is connected with the quadrature mixting circuit, demodulator circuit is connected with intermediate frequency amplifier circuit, demodulator circuit is connected with the audio frequency handover module, Voltage-Controlled oscillation circuit is connected with the quadrature mixting circuit, and Voltage-Controlled oscillation circuit is connected with microprocessor.
3. according to the set-top box of the described band FM receiver function of claim 1, it is characterized in that described bandwidth-limited circuit adopts the 87-107MHz band pass filter.
4. the operation method of the set-top box of band FM receiver function is characterized in that, may further comprise the steps:
A. user's selector top box enters radio-receiving mode;
B. set-top-box system is closed the audio frequency output of Digital Television, utilizes the audio frequency handover module to switch to the audio frequency output of radio reception module, judges whether the user keeps television video frequency signal, if then enter the c step, if not then enter the d step;
C. continue to keep existing video signal, enter the e step;
D. close existing video, the standby of set-top box video decode part;
E. set-top-box system shows the radio reception menu to the user;
F. after selecting to search corresponding radio station according to the user, the user normally listens to;
G. the user selects to withdraw from radio-receiving mode;
H. set-top-box system reduces the audio frequency and video output of former Digital Television.
5. according to the operation method of the set-top box of the described band FM receiver function of claim 4, it is characterized in that, further comprising the steps of between steps d and the step e:
I. judge whether the user selects static images to show, if then enter the j step, if not then enter the k step;
J. show static images, and enter the e step;
K. do not have video output, and enter the e step.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910308929XA CN101674396B (en) | 2009-10-28 | 2009-10-28 | Set top box with function of frequency modulation (FM) radio and operating method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910308929XA CN101674396B (en) | 2009-10-28 | 2009-10-28 | Set top box with function of frequency modulation (FM) radio and operating method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101674396A true CN101674396A (en) | 2010-03-17 |
| CN101674396B CN101674396B (en) | 2012-04-18 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200910308929XA Expired - Fee Related CN101674396B (en) | 2009-10-28 | 2009-10-28 | Set top box with function of frequency modulation (FM) radio and operating method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111316355A (en) * | 2017-11-03 | 2020-06-19 | 深圳传音通讯有限公司 | Audio noise reduction method, noise reduction device, mobile terminal and readable storage medium |
| CN112130687A (en) * | 2019-06-24 | 2020-12-25 | 北京车和家信息技术有限公司 | Radio station channel switching method, terminal and vehicle |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5148280A (en) * | 1990-08-06 | 1992-09-15 | Thomson Consumer Electronics, Inc. | Stereo fm radio in a television receiver |
| CN1121782C (en) * | 2000-02-23 | 2003-09-17 | 海信集团公司 | Colour TV set with FM radio function |
| CN2932870Y (en) * | 2006-02-21 | 2007-08-08 | 成都旭光科技股份有限公司 | Electronic tuner for receipt of both analog and digital TV signals |
-
2009
- 2009-10-28 CN CN200910308929XA patent/CN101674396B/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111316355A (en) * | 2017-11-03 | 2020-06-19 | 深圳传音通讯有限公司 | Audio noise reduction method, noise reduction device, mobile terminal and readable storage medium |
| CN112130687A (en) * | 2019-06-24 | 2020-12-25 | 北京车和家信息技术有限公司 | Radio station channel switching method, terminal and vehicle |
| CN112130687B (en) * | 2019-06-24 | 2024-02-02 | 北京车和家信息技术有限公司 | Radio station channel switching method, terminal and vehicle |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101674396B (en) | 2012-04-18 |
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Granted publication date: 20120418 |