CN203368450U - Channel selecting device of audio receiving chip and audio receiver - Google Patents
Channel selecting device of audio receiving chip and audio receiver Download PDFInfo
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- CN203368450U CN203368450U CN 201320385458 CN201320385458U CN203368450U CN 203368450 U CN203368450 U CN 203368450U CN 201320385458 CN201320385458 CN 201320385458 CN 201320385458 U CN201320385458 U CN 201320385458U CN 203368450 U CN203368450 U CN 203368450U
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Abstract
The utility model relates to the channel selecting device of an audio receiving chip and an audio receiver. The channel selecting device of the audio receiving chip comprises a digital local oscillator module used for generating digital local oscillator signals, a digital frequency mixing module used for carrying out the frequency mixing operation on digital low-and-intermediate frequency signals with the digital local oscillator signals, a frequency selecting and filtering module used for carrying out the frequency selecting and filtering operation on the frequency mixing signals to obtain digital zero-intermediate frequency signals, a transmit-receive frequency difference estimation module used for estimating the transmit-receive frequency difference according to the digital zero-intermediate frequency signals within a predetermined frequency range, and a local oscillator conditioning signal generation module used for generating local oscillator conditioning signals according to the transmit-receive frequency difference. The predetermined frequency range at least comprises a target receiving channel and adjacent channels of the target receiving channel. The digital local oscillator module conditions the digital local oscillator signals according to the local oscillator conditioning signals. In this way, the audio receiving chip is capable of receiving effective channels within the predetermined frequency range. According to the technical scheme of the utility model, the channel selecting function is realized by means of a channel selector. Therefore, users can quickly and easily select desired channels, so that users feel friendly to use the device.
Description
Technical field
The utility model relates to the reception technique field, relates in particular to a kind of tune table apparatus and voice receiver of audio frequency receiving chip.
Background technology
Broadcast receiver is a kind of by the widely used electronic product of people.It is frequency mixer that the wireless signal of tradition is processed core, for by radiofrequency signal and the mixing of local oscillated signal phase, generates the Low Medium Frequency signal; As shown in Figure 1, structural representation for the voice receiver of available technology adopting PVC electric capacity, frequency mixer 11 carries out the local oscillated signal of the radiofrequency signal of different frequency and local oscillator 10 generations to obtain the fixing Low Medium Frequency signal of centre frequency after mixing, this Low Medium Frequency signal is sent into demodulator 13 after frequency-selecting filter 12 filtering, and demodulator 13 demodulates audio signal.When adjusting platform, the frequency of the local oscillated signal that local oscillator 10 generates can change along with receiving channels, and the radiofrequency signal of different channel will be converted to the fixing Low Medium Frequency signal of centre frequency like this.As shown in Figure 2, be the structural representation of local oscillator in the voice receiver shown in Fig. 1 in prior art, PVC electric capacity 101 forms LC in parallel loop with inductance 102, coordinates oscillating circuit 103 to form a LC oscillator, and the frequency of oscillation of LC oscillator is:
visible, capacitance has directly determined frequency of oscillation.While adopting PVC electric capacity tuning, user slow circumvolve radio station on one side adjusts knob, listening to audio output on one side, search for Air Radio by the variation of distinguishing audio frequency, then near the Air Radio arrived in Primary Location, knob is adjusted in the fine setting radio station, and the audio frequency effect by station broadcast makes voice receiver aim at transmitting station as far as possible.But adopt the voice receiver of PVC electric capacity to have following shortcoming: PVC capacitance variation with temperature is 30～50PPM/ ℃, voice receiver is difficult to accurately be operated on target channel like this, and certain deviation is always arranged; The PVC electric capacity volume of above-mentioned voice receiver is large, take circuit board space, increase product cost, be unfavorable for the product miniaturization; PVC electric capacity changes continuously, can not realize automatic channel search.
Therefore, in order to overcome the problems referred to above, the technical staff utilizes software radio thought and digital signal processor, and (Digital Signal Processor, hereinafter to be referred as DSP) technology, the single-chip of having realized voice receiver is integrated, has obviously reduced product cost and has dwindled board area.As shown in Figure 3, structural representation for the voice receiver of available technology adopting DSP technology, Anneta module 30 received RF signals, be transferred to low noise amplifier 31 and amplify processing, local oscillator 32 produces the mutually orthogonal local oscillated signal of two-way, send into respectively frequency mixer 33 and carry out mixing with the output signal of low noise amplifier 31, produce the mutually orthogonal I/Q Low Medium Frequency signal of two-way, then carry out analog-to-digital conversion through analog to digital converter 34 respectively, digital signal after analog-to-digital conversion is input in DSP36 carries out a series of signal processing, comprise Frequency mixing processing and demodulation process, for example: image frequency suppresses to process, frequency-selective filtering is processed, FM or AM demodulation process and audio frequency filtering are processed, signal after DSP36 processes is transformed into simulated audio signal through digital to analog converter 37, and by the driving of audio frequency power amplifier 38, loud speaker 39 changes simulated audio signal into sound, channel selector 43 is as adjusting the platform device, can obtain the different partial pressure value to chip power voltage, can correspondence go out a target receiving channels according to the partial pressure value size, be deposited into register 42, according to the frequency control word of the target receiving channels control frequency synthesizer 35 in register 42, realize specifying the reception of FM or AM channel Air Radio, integrated I on chip
2 c bus interface 41, (Microprogrammed Control Unit, be called for short: MCU) 40 can pass through I in the outer micro-control of chip unit
2the audio frequency receiving course of C bus control chip.
But, when channel selector is to carry out dispersion channel point while adjusting platform with the step-length of appointment in the FM of appointment or AM frequency range, the user is when search air broadcast radio station, just can pick out the existence of air broadcast platform while only having channel selector just in time to aim at the air broadcast radio station, cause by hand and look for the platform difficulty, while making the user can't obtain adjusting platform continuously as PVC electric capacity knob, speak soon, easily look for the close friend of platform to use impression.
Summary of the invention
The utility model provides a kind of tune table apparatus and voice receiver of audio frequency receiving chip, while in order to realization, utilizing channel selector to adjust platform, for the user provides, speaks soon, easily looks for the close friend of platform to use impression.
The utility model provides a kind of tune table apparatus of audio frequency receiving chip, comprising:
The digital local oscillator module, for the generating digital local oscillated signal;
The digital mixing module, for carrying out mixing by digital Low Medium Frequency signal and described digital local oscillated signal;
Frequency-selecting and filtering module, carry out frequency-selective filtering for the signal to after mixing, obtains the digital zero intermediate-freuqncy signal;
Transmitting-receiving frequency difference estimation module, for the described digital zero intermediate-freuqncy signal according in scheduled frequency range, estimate the transmitting-receiving frequency difference, and wherein, described scheduled frequency range at least comprises the adjacent channel of target receiving channels and described target receiving channels;
Local oscillator is adjusted the signal generation module, for according to described transmitting-receiving frequency difference, generates local oscillator and adjusts signal;
Described digital local oscillator module also, for according to described local oscillator, adjusting signal, is adjusted described digital local oscillated signal, makes described audio frequency receiving chip receive the effective channel in described scheduled frequency range.
The utility model also provides a kind of audio frequency receiving chip, comprising:
Local oscillator, for according to channel selecting signal, produce local oscillated signal;
Frequency mixer, become simulation Low Medium Frequency signal with described local oscillated signal mixing for the radiofrequency signal by receiving;
Analog to digital converter, for being transformed into digital Low Medium Frequency signal by described simulation Low Medium Frequency signal;
Digital signal processor DSP, for carrying out Frequency mixing processing and demodulation process, the outputting digital audio signal to described digital Low Medium Frequency signal;
Digital to analog converter, for being transformed into simulated audio signal by described digital audio and video signals;
Described DSP comprises arbitrary described tune table apparatus.
The utility model also provides a kind of voice receiver, comprising:
Anneta module, for received RF signal;
Described audio frequency receiving chip, be connected with described Anneta module, for according to channel selecting signal, described radiofrequency signal is transformed into to simulated audio signal;
Channel selector, be connected with described audio frequency receiving chip, for described channel selecting signal is provided;
Loud speaker, be connected with described audio frequency receiving chip, for changing described simulated audio signal into sound;
Controller, for controlling the audio frequency receiving course of described audio frequency receiving chip;
Power supply, be used to described audio frequency to receive chip power supply.
In the tune table apparatus of audio frequency receiving chip of the present utility model, digital local oscillator module generating digital local oscillated signal; The digital mixing module is carried out mixing by digital Low Medium Frequency signal and digital local oscillated signal; The signal of frequency-selecting and filtering module after to mixing carries out frequency-selective filtering, obtains the digital zero intermediate-freuqncy signal; Transmitting-receiving frequency difference estimation module, according to the digital zero intermediate-freuqncy signal in scheduled frequency range, is estimated the transmitting-receiving frequency difference, and wherein, scheduled frequency range at least comprises the adjacent channel of target receiving channels and target receiving channels; Local oscillator is adjusted the signal generation module according to the transmitting-receiving frequency difference, generates local oscillator and adjusts signal; The digital local oscillator module is adjusted signal according to local oscillator, adjusts digital local oscillated signal, makes the audio frequency receiving chip receive the effective channel in scheduled frequency range.Like this, owing to thering is wider scheduled frequency range, the scope of transmitting-receiving frequency difference estimation is compared with prior art wider, therefore, the user, when using this device to adjust platform, can either receive fast and wish the channel of listening to, and can not miss the broadcast program that some is liked again, in the time of can realizing utilizing channel selector to adjust platform, for providing, the user speak soon, easily look for the close friend of platform to use impression.
The accompanying drawing explanation
The structural representation of the voice receiver that Fig. 1 is available technology adopting PVC electric capacity;
Fig. 2 is the structural representation of local oscillator in the voice receiver shown in Fig. 1 in prior art;
The structural representation of the voice receiver that Fig. 3 is available technology adopting DSP technology;
The schematic flow sheet of the tune platform embodiment of the method that Fig. 4 is audio frequency receiving chip of the present utility model;
The fundamental diagram of the frequency-selecting and filtering module in the tune platform embodiment of the method that Fig. 5 is audio frequency receiving chip of the present utility model;
The structural representation of the tune table apparatus embodiment that Fig. 6 is audio frequency receiving chip of the present utility model;
The structural representation that Fig. 7 is audio frequency receiving chip embodiment of the present utility model;
The structural representation that Fig. 8 is voice receiver embodiment of the present utility model.
Embodiment
Below in conjunction with specification drawings and specific embodiments, the utility model will be further described.
As shown in Figure 4, the schematic flow sheet for the tune platform embodiment of the method for audio frequency receiving chip of the present utility model, can comprise the steps:
Alternatively, the purpose that the signal of selected frequency filtration module after to mixing carries out frequency-selective filtering is to remove interference signal, and for example: the audio frequency receiving chip is FM audio frequency receiving chip, and FM broadcast singal bandwidth is 200kHz, and FM frequency-selecting and filtering module bandwidth is 200kHz; The audio frequency receiving chip is AM audio frequency receiving chip, and AM broadcast singal bandwidth is 6kHz, and AM frequency-selecting and filtering module bandwidth is 6kHz.
The frequency of alternatively, establishing the target receiving channels is X; The audio frequency receiving chip is FM audio frequency receiving chip, the frequency interval of adjacent two channels is 100kHz, scheduled frequency range can be X-200kHz～X+200kHz, the audio frequency receiving chip is AM audio frequency receiving chip, the frequency interval of adjacent two channels is 1kHz, and scheduled frequency range can be X-10kHz～X+10kHz;
Alternatively, local oscillator is adjusted the signal generation module according to the transmitting-receiving frequency difference, and generating local oscillator adjustment signal can comprise: gain unit is dwindled the transmitting-receiving frequency difference, its objective is that the speed to following the tracks of effective platform is adjusted, like this can be so that follow the tracks of more stably operation; Integral unit is accumulated the transmitting-receiving frequency difference after dwindling; Frequency deviation is adjusted the amplitude limit unit transmitting-receiving frequency difference after accumulating is carried out to amplitude limiting processing, its objective is the ceiling restriction of transmitting-receiving frequency difference in scheduled frequency range, for example, the audio frequency receiving chip is FM audio frequency receiving chip, the frequency interval of adjacent two channels is 100kHz, frequency deviation is adjusted the amplitude limit unit and will be received and dispatched the ceiling restriction of frequency difference at X+0kHz～X+200kHz so, the audio frequency receiving chip is AM audio frequency receiving chip, the frequency interval of adjacent two channels is 1kHz, and frequency deviation is adjusted the amplitude limit unit and will be received and dispatched the ceiling restriction of frequency difference at X+0kHz～X+10kHz so.
The utility model is used the transmitting-receiving frequency difference estimation module of large frequency-difference scope, the FM voice receiver of take is used the tune platform method of the utility model audio frequency receiving chip as the example explanation and listens to the process of adjacent platform, inferior adjacent platform, the frequency-selecting and filtering module bandwidth is 200kHz, and FM broadcast singal bandwidth is 200kHz; As shown in Figure 5, fundamental diagram for the frequency-selecting and filtering module in the tune platform embodiment of the method for audio frequency receiving chip of the present utility model, as shown in Figure 5A, when transceiver frequency channel is identical, actual transmitting-receiving frequency difference is determined by the crystal oscillator deviation, is less than 10kHz, after frequency-selective filtering, most of FM broadcast singal is by frequency-selecting and filtering module, and the transmitting-receiving frequency difference is easily estimated.
As shown in Fig. 5 B and Fig. 5 C, when effective channel is positioned at the adjacent platform of 100kHz of target receiving channels, upper sideband (or lower sideband) signal of adjacent platform signal is positioned at the frequency-selecting and filtering module passband, and lower sideband (or upper sideband) signal is positioned at transition band and the stopband of frequency-selecting and filtering module.Because adjacent platform signal at least over half can pass through frequency-selecting and filtering module, although the transmitting-receiving frequency difference of estimating in DSP is less than actual transmitting-receiving frequency difference, but this has just increased the time of following the tracks of adjacent platform signal, along with local oscillator is adjusted the accumulation of signal generation module and the adjustment of digital local oscillator module, how adjacent platform signal passes through frequency-selecting and filtering module, it is more and more faster that local oscillator is adjusted the speed of signal generation module generation local oscillator adjustment signal, regulating the speed of digital local oscillator module is also more and more faster, and finally make voice receiver aim at adjacent platform signal reception, make the user capture in advance adjacent platform broadcast.
As shown in Figure 5 D, and 5 E, when effective channel is positioned at 200kHz adjacent platform of target receiving channels, 200kHz adjacent platform signal of sub-fraction can pass through frequency-selecting and filtering module, it is little more that the transmitting-receiving frequency difference of estimating in DSP is received and dispatched frequency difference than reality, but as long as estimate that the positive and negative and actual transmitting-receiving frequency difference of transmitting-receiving frequency difference is consistent, the integral unit that local oscillator is adjusted in the signal generation module just can be accumulated the transmitting-receiving frequency difference of estimation, the digital local oscillator module is adjusted signal according to local oscillator and is carried out the frequency adjustment, along with local oscillator is adjusted the accumulation of signal generation module and the adjustment of digital local oscillator module, more and more repeatedly adjacent platform signal enters frequency-selecting and filtering module, more transmitting-receiving frequency difference is estimated, it is more and more faster that local oscillator is adjusted the speed of signal generation module generation local oscillator adjustment signal, regulating the speed of digital local oscillator module is also more and more faster, and finally make voice receiver aim at time adjacent platform signal reception, make the user capture in advance time adjacent platform broadcast.
In the utility model, digital local oscillator module generating digital local oscillated signal; The digital mixing module is carried out mixing by digital Low Medium Frequency signal and digital local oscillated signal; The signal of frequency-selecting and filtering module after to mixing carries out frequency-selective filtering, obtains the digital zero intermediate-freuqncy signal; Transmitting-receiving frequency difference estimation module, according to the digital zero intermediate-freuqncy signal in scheduled frequency range, is estimated the transmitting-receiving frequency difference, and wherein, scheduled frequency range at least comprises the adjacent channel of target receiving channels and target receiving channels; Local oscillator is adjusted the signal generation module according to the transmitting-receiving frequency difference, generates local oscillator and adjusts signal; The digital local oscillator module is adjusted signal according to local oscillator, adjust digital local oscillated signal, make the audio frequency receiving chip receive the effective channel in scheduled frequency range, like this, owing to having wider scheduled frequency range, the scope of transmitting-receiving frequency difference estimation is compared with prior art wider, therefore, the user, when using this method to adjust platform, can either receive fast and wish the channel of listening to, and can not miss the broadcast program that some is liked again; The user, when utilizing channel selector to adjust platform, also can search for Air Radio by the variation of distinguishing audio frequency, thereby for the user provides, speak soon, easily looks for the close friend of platform to use impression.
Alternatively, the present embodiment has also been introduced intelligent AFC resetting technique, and the present embodiment can also comprise the steps: that interstation calculates the frequency difference of target receiving channels and effective channel apart from computing module; When reseting module is zero or is greater than predetermined threshold when frequency difference, the transmitting-receiving frequency difference after accumulation is adjusted into to zero; Alternatively, the audio frequency receiving chip is FM audio frequency receiving chip, and the frequency interval of adjacent two channels is 100kHz, and predetermined threshold can be less than or equal to 200kHz; The audio frequency receiving chip is AM audio frequency receiving chip, and the frequency interval of adjacent two channels is 1kHz, and predetermined threshold can be less than or equal to 10kHz.
In the utility model embodiment, after searching effective channel, interstation can calculate the frequency difference of effective channel and target receiving channels apart from computing module, that is, and and the interstation distance.When if effectively the frequency difference of channel and target receiving channels is zero, be that the channel that channel selector will be tuning is just in time adjacent platform or the inferior adjacent platform traced into, reseting module is adjusted into zero by the transmitting-receiving frequency difference after accumulation, make the voice receiver receiving channels that directly aims at the mark, and can not be subject to the impact of the last time of integral unit accumulation adjustment amount when tuning.If effectively the frequency difference of channel and target receiving channels surpasses 200kHz, similarly, reseting module is adjusted into zero by the transmitting-receiving frequency difference after accumulation, directly abandons this target receiving channels signal is followed the tracks of.
As shown in Figure 6, structural representation for the tune table apparatus embodiment of audio frequency receiving chip of the present utility model, the tune table apparatus of audio frequency receiving chip can comprise: digital local oscillator module 70, and digital mixing module 62, frequency-selecting and filtering module 63, transmitting-receiving frequency difference estimation module 64 and local oscillator are adjusted signal generation module 65; Digital mixing module 62 is connected with digital local oscillator module 70, frequency-selecting and filtering module 63 is connected with digital mixing module 62, transmitting-receiving frequency difference estimation module 64 is connected with frequency-selecting and filtering module 63, local oscillator is adjusted signal generation module 65 and is connected with digital local oscillator module 70 with transmitting-receiving frequency difference estimation module 64, and above each module forms closed-loop path.
Digital local oscillator module 70 is for the generating digital local oscillated signal; Digital mixing module 62 is for carrying out mixing by digital Low Medium Frequency signal and digital local oscillated signal, and wherein, digital Low Medium Frequency signal is generated by analog to digital converter 34; Frequency-selecting and filtering module 63 is carried out frequency-selective filtering for the signal to after mixing, obtains the digital zero intermediate-freuqncy signal; Transmitting-receiving frequency difference estimation module 64, for the digital zero intermediate-freuqncy signal according in scheduled frequency range, is estimated the transmitting-receiving frequency difference, and wherein, scheduled frequency range at least comprises the adjacent channel of target receiving channels and target receiving channels; Local oscillator is adjusted signal generation module 65 for according to the transmitting-receiving frequency difference, generates local oscillator and adjusts signal; Digital local oscillator module 70 also, for according to local oscillator, adjusting signal, is adjusted digital local oscillated signal, makes the audio frequency receiving chip receive the effective channel in scheduled frequency range.
Alternatively, then structural representation shown in Figure 6, local oscillator is adjusted signal generation module 65 and can be comprised: gain unit 651, integral unit 652 and frequency deviation are adjusted amplitude limit unit 653; Gain unit 651 is for being dwindled the transmitting-receiving frequency difference; Integral unit 652 is accumulated for the transmitting-receiving frequency difference by after dwindling; Frequency deviation is adjusted amplitude limit unit 653 and is carried out amplitude limiting processing for the transmitting-receiving frequency difference to after accumulation; Alternatively, the amplitude limit scope can be X+0kHz～X+200kHz.
Alternatively, the tune table apparatus of audio frequency receiving chip can also comprise: interstation is apart from computing module 67 and reseting module 68; Interstation apart from computing module 67 for calculating target receiving channels and the effective frequency difference of channel; Reseting module 68, for being zero or while being greater than predetermined threshold when frequency difference, is adjusted into zero by the transmitting-receiving frequency difference after accumulation; Alternatively, the audio frequency receiving chip is FM audio frequency receiving chip, and the frequency interval of adjacent two channels is 100kHz, and predetermined threshold can be less than or equal to 200kHz; The audio frequency receiving chip is AM audio frequency receiving chip, and the frequency interval of adjacent two channels is 1kHz, and predetermined threshold can be less than or equal to 10kHz.
As shown in Figure 7, be the structural representation of audio frequency receiving chip embodiment of the present utility model, the audio frequency receiving chip can comprise: local oscillator 32, frequency mixer 33, analog to digital converter 34, digital signal processor DSP 36 and digital to analog converter 37; Local oscillator 32 is for producing local oscillated signal according to channel selecting signal; Frequency mixer 33 becomes simulation Low Medium Frequency signal with the local oscillated signal mixing for the radiofrequency signal by receiving; Analog to digital converter 34 is transformed into digital Low Medium Frequency signal for simulating the Low Medium Frequency signal; DSP36 is for carrying out Frequency mixing processing and demodulation process to digital Low Medium Frequency signal, the outputting digital audio signal; Digital to analog converter 37 is for being transformed into simulated audio signal by digital audio and video signals; DSP36 comprises the tune table apparatus shown in Fig. 6, does not repeat them here.
As shown in Figure 8, be the structural representation of voice receiver embodiment of the present utility model, voice receiver can comprise: Anneta module 30, audio frequency receiving chip 70, channel selector 43, loud speaker 39, controller 83 and power supply 85; Audio frequency receiving chip 70 is connected with Anneta module 30, and channel selector 43, controller 83, loud speaker 39 and power supply 85 are connected with audio frequency receiving chip 70 respectively.
Anneta module 30 is for received RF signal; Audio frequency receiving chip 70, for according to channel selecting signal, is transformed into simulated audio signal by radiofrequency signal; Channel selector 43 is for providing channel selecting signal; Loud speaker 39 is for changing simulated audio signal into sound; Controller 83 is for controlling the audio frequency receiving course of audio frequency receiving chip 70; Power supply 85 is used to 70 power supplies of audio frequency receiving chip; Wherein, audio frequency receiving chip 70 can, for the receiving chip of audio frequency shown in Fig. 7, not repeat them here.
Alternatively, channel selector 43 can comprise potentiometer, button or touch-screen.
Finally it should be noted that: above embodiment is only unrestricted in order to the technical solution of the utility model to be described, although with reference to preferred embodiment, the utility model is had been described in detail, those of ordinary skill in the art is to be understood that, can modify or be equal to replacement the technical solution of the utility model, and not break away from the spirit and scope of technical solutions of the utility model.
Claims (6)
1. the tune table apparatus of an audio frequency receiving chip, is characterized in that, comprising:
The digital local oscillator module, for the generating digital local oscillated signal;
The digital mixing module, for carrying out mixing by digital Low Medium Frequency signal and described digital local oscillated signal;
Frequency-selecting and filtering module, carry out frequency-selective filtering for the signal to after mixing, obtains the digital zero intermediate-freuqncy signal;
Transmitting-receiving frequency difference estimation module, for the described digital zero intermediate-freuqncy signal according in scheduled frequency range, estimate the transmitting-receiving frequency difference, and wherein, described scheduled frequency range at least comprises the adjacent channel of target receiving channels and described target receiving channels;
Local oscillator is adjusted the signal generation module, for according to described transmitting-receiving frequency difference, generates local oscillator and adjusts signal;
Described digital local oscillator module also, for according to described local oscillator, adjusting signal, is adjusted described digital local oscillated signal, makes described audio frequency receiving chip receive the effective channel in described scheduled frequency range.
2. tune table apparatus according to claim 1, is characterized in that, described local oscillator is adjusted the signal generation module and comprised:
Gain unit, for being dwindled described transmitting-receiving frequency difference;
Integral unit, accumulated for the transmitting-receiving frequency difference by after dwindling;
Frequency deviation is adjusted the amplitude limit unit, for the transmitting-receiving frequency difference to after accumulation, carries out amplitude limiting processing.
3. tune table apparatus according to claim 1, is characterized in that, also comprises:
Interstation is apart from computing module, for calculating the frequency difference of described target receiving channels and described effective channel;
Reseting module, for being zero or while being greater than predetermined threshold when described frequency difference, be adjusted into zero by the transmitting-receiving frequency difference after described accumulation.
4. an audio frequency receiving chip comprises:
Local oscillator, for according to channel selecting signal, produce local oscillated signal;
Frequency mixer, become simulation Low Medium Frequency signal with described local oscillated signal mixing for the radiofrequency signal by receiving;
Analog to digital converter, for being transformed into digital Low Medium Frequency signal by described simulation Low Medium Frequency signal;
Digital signal processor DSP, for carrying out Frequency mixing processing and demodulation process, the outputting digital audio signal to described digital Low Medium Frequency signal;
Digital to analog converter, for being transformed into simulated audio signal by described digital audio and video signals;
It is characterized in that, described DSP comprises the arbitrary described tune table apparatus of claims 1 to 3.
5. a voice receiver, is characterized in that, comprising:
Anneta module, for received RF signal;
Audio frequency receiving chip claimed in claim 4, be connected with described Anneta module, for according to channel selecting signal, described radiofrequency signal is transformed into to simulated audio signal;
Channel selector, be connected with described audio frequency receiving chip, for described channel selecting signal is provided;
Loud speaker, be connected with described audio frequency receiving chip, for changing described simulated audio signal into sound;
Controller, for controlling the audio frequency receiving course of described audio frequency receiving chip;
Power supply, be used to described audio frequency to receive chip power supply.
6. voice receiver according to claim 5, is characterized in that, described channel selector comprises: potentiometer, button or touch-screen.
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| CN 201320385458 CN203368450U (en) | 2013-07-01 | 2013-07-01 | Channel selecting device of audio receiving chip and audio receiver |
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| CN 201320385458 CN203368450U (en) | 2013-07-01 | 2013-07-01 | Channel selecting device of audio receiving chip and audio receiver |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103346812A (en) * | 2013-07-01 | 2013-10-09 | 北京昆腾微电子有限公司 | Channel switching method and device of audio receiving chip and audio receiving machine |
| CN105991203A (en) * | 2015-03-05 | 2016-10-05 | 博通集成电路（上海）有限公司 | Channel selection device and method thereof |
| CN107516119A (en) * | 2016-06-17 | 2017-12-26 | 南京理工大学 | A kind of passive resonant sensor label of wireless poll |
| CN111901002A (en) * | 2019-05-05 | 2020-11-06 | 海能达通信股份有限公司 | Method for improving performance of low-intermediate frequency receiver, storage medium and receiver |
-
2013
- 2013-07-01 CN CN 201320385458 patent/CN203368450U/en not_active Expired - Lifetime
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103346812A (en) * | 2013-07-01 | 2013-10-09 | 北京昆腾微电子有限公司 | Channel switching method and device of audio receiving chip and audio receiving machine |
| CN103346812B (en) * | 2013-07-01 | 2015-11-25 | 昆腾微电子股份有限公司 | The tune platform method and apparatus of audio frequency receiving chip and voice receiver |
| CN105991203A (en) * | 2015-03-05 | 2016-10-05 | 博通集成电路（上海）有限公司 | Channel selection device and method thereof |
| CN105991203B (en) * | 2015-03-05 | 2018-10-30 | 博通集成电路（上海）股份有限公司 | Frequency channel-selection assembly and its method |
| CN107516119A (en) * | 2016-06-17 | 2017-12-26 | 南京理工大学 | A kind of passive resonant sensor label of wireless poll |
| CN111901002A (en) * | 2019-05-05 | 2020-11-06 | 海能达通信股份有限公司 | Method for improving performance of low-intermediate frequency receiver, storage medium and receiver |
| CN111901002B (en) * | 2019-05-05 | 2021-11-16 | 海能达通信股份有限公司 | Method for improving performance of low-intermediate frequency receiver, storage medium and receiver |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee |
Owner name: KUNTENG MICROELECTRONIC CO., LTD. Free format text: FORMER NAME: BEIJING KUNTENG MICRO-ELECTRONICS INC. Owner name: BEIJING KUNTENG MICRO-ELECTRONICS INC. Free format text: FORMER NAME: KT MICRO, INC. |
|
| CP01 | Change in the name or title of a patent holder |
Address after: 100195 Beijing, Yuquan, No. 23 Haidian District Road, building No. 4 Patentee after: KT MICRO, Inc. Address before: 100195 Beijing, Yuquan, No. 23 Haidian District Road, building No. 4 Patentee before: Beijing Kunteng electronic Limited by Share Ltd. Address after: 100195 Beijing, Yuquan, No. 23 Haidian District Road, building No. 4 Patentee after: Beijing Kunteng electronic Limited by Share Ltd. Address before: 100195 Beijing, Yuquan, No. 23 Haidian District Road, building No. 4 Patentee before: KT MICRO Inc. (BEIJING) |
|
| AV01 | Patent right actively abandoned |
Granted publication date: 20131225 Effective date of abandoning: 20151125 |
|
| AV01 | Patent right actively abandoned |
Granted publication date: 20131225 Effective date of abandoning: 20151125 |
|
| C25 | Abandonment of patent right or utility model to avoid double patenting |