CN101674396B - 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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- CN101674396B CN101674396B CN200910308929XA CN200910308929A CN101674396B CN 101674396 B CN101674396 B CN 101674396B CN 200910308929X A CN200910308929X A CN 200910308929XA CN 200910308929 A CN200910308929 A CN 200910308929A CN 101674396 B CN101674396 B CN 101674396B
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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 set top 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 which is 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 STB.
Background technology
Along with the development of DTV, the user is increasingly high for the acceptance level of DTV STB, popularizes gradually at some city digital TV set-top box.The DTV epoch have been realized STB 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.The much human custom is being opened television set " listening " television set on one side simultaneously, Yi Bian do other thing, iff is to have only voice output, need not consider the content of video output, does not also 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 STB exactly, and a kind of STB and operation method thereof with FM receiver function is provided.
The present invention solves its technical problem, and the technical scheme of employing is the STB of band FM receiver function; Comprise the STB body, the STB body comprises microprocessor, signal input part, audio operational amplifying circuit and audio output, and audio output is connected with the audio operational amplification module; It is characterized in that; Also comprise bandpass filtering modules block, radio reception module, audio frequency handover module and audio operational amplification module, said signal input part is connected with bandpass filtering modules block, and 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; Said radio reception module comprises low noise amplifier circuit, quadrature mixting circuit, IF amplifier circuit, demodulator circuit and Voltage-Controlled oscillation circuit; Said low noise amplifier circuit is connected with bandpass filtering modules block, and the quadrature mixting circuit is connected with low noise amplifier circuit, and IF amplifier circuit is connected with the quadrature mixting circuit; Demodulator circuit is connected with IF amplifier circuit; Demodulator circuit is connected with the audio frequency handover module, and Voltage-Controlled oscillation circuit is connected with the quadrature mixting circuit, and Voltage-Controlled oscillation circuit is connected with microprocessor.
Further, said bandwidth-limited circuit adopts the 87-107MHz band pass filter.
The operation method of the STB of band FM receiver function is characterized in that, may further comprise the steps:
A. user's selector top box gets into radio-receiving mode;
B. set-top-box system is closed the audio frequency output of DTV, utilizes the audio frequency handover module to switch to the audio frequency output of radio reception module, and whether judges keeps television video frequency signal, if then get into the c step, if not then get into the d step;
C. continue to keep existing video signal, get into the e step;
D. close existing video, the standby of STB 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 DTV.
Further, further comprising the steps of between steps d and the step e:
I. whether judges selects static images to show, if then get into the j step, if not then get into the k step;
J. show static images, and get into the e step;
K. do not have video output, and get into the e step.
The invention has the beneficial effects as follows; STB and operation method thereof through above-mentioned band FM receiver function can make STB possess the function of FM receiver; And owing to 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 accompanying drawing and embodiment, describe technical scheme of the present invention in detail.
The invention provides a kind of STB 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, and the radio reception module is connected with microprocessor, and the audio frequency handover module is connected with microprocessor; The audio operational amplification module is connected with the audio frequency handover module, and audio output and audio operational amplification module connect to form, and its operation method is: at first user's selector top box gets into radio-receiving mode; Then set-top-box system is closed the audio frequency output of DTV, utilizes the audio frequency handover module to switch to the audio frequency output of radio reception module, and whether judges keeps television video frequency signal; If then continue to keep existing video signal; If not then close existing video, and the standby of STB 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 DTV.
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, and 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; Audio output and audio operational amplification module connect to form the STB of band FM receiver function, and 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; IF amplifier circuit is connected with the quadrature mixting circuit, and demodulator circuit is connected with IF 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 got into radio-receiving mode, at first, the STB microprocessor sent instruction to Voltage-Controlled oscillation circuit, and Voltage-Controlled oscillation circuit is modulated at suitable frequency; Simultaneously, the FM radio reception module that is outputted to of audio switch is exported, after RF signal (radiofrequency signal) input, at first got into the 87-107MHz band pass filter through IIC or logic control; Useful FM signal is leached, remove other interference signal simultaneously, like normal cable TV signal, this signal gets into low noise amplifier then; The signal attenuation that the compensating band bandpass filter brings gets into orthogonal mixer then, and the fixed frequency signal of exporting with Voltage-Controlled oscillation circuit carries out mixing, at this moment; The STB microprocessor is the control Voltage-Controlled oscillation circuit constantly, produces different frequency output, carries out the search in radio station, in case the user finds suitable radio station; Be fixed frequency, produce intermediate-freuqncy signal, in general for being fixed as 10.7MHz; The intermediate-freuqncy signal of output is once amplified again, gets into demodulator, solves normal stereo audio signal.Simultaneously, the audio signal of output gets into 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 STB, 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, like the TEA5760 broadcast receiver chip of NXP company.
Claims (4)
1. the STB of band FM receiver function comprises the STB body, and the STB body comprises signal input part, microprocessor, audio operational amplifying circuit and audio output; Audio output is connected with the audio operational amplification module, it is characterized in that, also comprises bandpass filtering modules block, radio reception module and audio frequency handover module; Said signal input part is connected with bandpass filtering modules block; Bandpass filtering modules block is connected with the radio reception module, and the radio reception module is connected with the audio frequency handover module, and the radio reception module is connected with microprocessor; The audio frequency handover module is connected with microprocessor, and the audio operational amplification module is connected with the audio frequency handover module;
Said radio reception module comprises low noise amplifier circuit, quadrature mixting circuit, IF amplifier circuit, demodulator circuit and Voltage-Controlled oscillation circuit; Said low noise amplifier circuit is connected with bandpass filtering modules block, and the quadrature mixting circuit is connected with low noise amplifier circuit, and IF amplifier circuit is connected with the quadrature mixting circuit; Demodulator circuit is connected with IF amplifier circuit; Demodulator circuit is connected with the audio frequency handover module, and Voltage-Controlled oscillation circuit is connected with the quadrature mixting circuit, and Voltage-Controlled oscillation circuit is connected with microprocessor;
Said Voltage-Controlled oscillation circuit is used to modulate suitable frequency;
Said audio frequency handover module is used for switching to when needed the output of FM radio reception module, and exports the stereo audio signal that receives to the audio operational amplification module;
Said bandpass filtering modules block is used for the signal from the signal input part input is leached useful FM signal and removes other interference signal;
Said low noise amplifier circuit is used for the signal attenuation that compensation brings through band pass filter to input signal;
Said quadrature mixting circuit is used for the fixed frequency signal of the signal of low noise amplifier circuit output and Voltage-Controlled oscillation circuit output is carried out mixing;
The intermediate-freuqncy signal that said IF amplifier circuit is used for after the mixing of pair of orthogonal mixting circuit output is amplified;
Said demodulator circuit is used for carrying out demodulation according to the intermediate-freuqncy signal of IF amplifier circuit output, obtains normal stereo audio signal, is transferred to the audio frequency handover module.
2. according to the STB of the said band FM receiver function of claim 1, it is characterized in that said bandwidth-limited circuit adopts the 87-107MHz band pass filter.
3. the operation method of the STB of band FM receiver function is characterized in that, may further comprise the steps:
A. user's selector top box gets into radio-receiving mode;
B. set-top-box system is closed the audio frequency output of DTV, utilizes the audio frequency handover module to switch to the audio frequency output of radio reception module, and whether judges keeps television video frequency signal, if then get into the c step, if not then get into the d step;
C. continue to keep existing video signal, get into the e step;
D. close existing video, the standby of STB 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 DTV.
4. according to the operation method of the STB of the said band FM receiver function of claim 3, it is characterized in that, further comprising the steps of between steps d and the step e:
I. whether judges selects static images to show, if then get into the j step, if not then get into the k step;
J. show static images, and get into the e step;
K. do not have video output, and get into 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 |
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| Publication Number | Publication Date |
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| CN101674396A CN101674396A (en) | 2010-03-17 |
| CN101674396B true CN101674396B (en) | 2012-04-18 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200910308929XA Active 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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| Country | Link |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019084886A1 (en) * | 2017-11-03 | 2019-05-09 | 深圳传音通讯有限公司 | Audio denoising method and denoising device, mobile terminal and readable storage medium |
| 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 |
Citations (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 |
| CN1274232A (en) * | 2000-02-23 | 2000-11-22 | 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 active Active
Patent Citations (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 |
| CN1274232A (en) * | 2000-02-23 | 2000-11-22 | 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 |
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| Publication number | Publication date |
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| CN101674396A (en) | 2010-03-17 |
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