CN206349990U - A kind of digital handset receiver demodulating system - Google Patents
A kind of digital handset receiver demodulating system Download PDFInfo
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- CN206349990U CN206349990U CN201720068304.0U CN201720068304U CN206349990U CN 206349990 U CN206349990 U CN 206349990U CN 201720068304 U CN201720068304 U CN 201720068304U CN 206349990 U CN206349990 U CN 206349990U
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Abstract
The utility model discloses a kind of digital handset receiver demodulating system, it mainly includes preamplifier, the first frequency mixer, the first intermediate frequency amplifier, the second frequency mixer, the second intermediate frequency amplifier, frequency discriminator, A/D converter and the digital signal processor being sequentially connected.The utility model is adapted to be demodulated MFSK (such as 4FSK) signal, it makes full use of amplification, mixing and frequency discriminator in the stenode circuit of traditional analog intercom, the data volume of receiver A/D samplings is small, the live load of follow-up signal processor is low, so as to reduce cost and power consumption.
Description
Technical field
The utility model relates generally to digital handset technical field, specifically a kind of digital handset receiver demodulation system
System.
Background technology
A/D conversion portions are required in receiver structure used in digital handset, for analog signal is converted into
Follow-up signal transacting is carried out after data signal.
Existing digit intercom receiver (such as accompanying drawing 1) after if sampling, then carry out at digital domain signal processing, signal
The workload of reason is than larger.
Utility model content
For the deficiency of the current technology of solution, the utility model combination prior art, from practical application, there is provided a kind of number
Word intercom receiver demodulating system, the system is placed on A/D (analog-to-digital conversion) links of sampling after frequency discriminator, when reducing unit
The data volume of interior sampling, reaches the purpose of reduction receiver complexity.
To achieve these goals, the technical solution of the utility model is as follows：
A kind of digital handset receiver demodulating system, including
The preamplifier being amplified to antenna input signal；
Preamplifier output signal is converted to the first frequency mixer of the first intermediate frequency；
The frequency synthesizer of local oscillation signal is provided for the first frequency mixer；
Amplify the first intermediate frequency amplifier of the first intermediate-freuqncy signal；
First intermediate-freuqncy signal is converted to the second frequency mixer of the second intermediate frequency；
Amplify the second intermediate frequency amplifier of the second intermediate-freuqncy signal；
Second intermediate-freuqncy signal is reduced to the frequency discriminator of emitter modulated signal；
The A/D converter sampled to frequency discriminator output signal；
To the digital signal processor of the further processing of sampled signal.
Signal conditioning circuit is additionally provided between the frequency discriminator and A/D converter.
The signal conditioning circuit includes wave filter and amplifier.
The beneficial effects of the utility model：
The utility model provides a kind of new digital handset receiver scheme, by the post-sampling in frequency discrimination, then enters
Row Digital Signal Processing, can reduce the data volume of sampling in the unit interval, reach the purpose of reduction receiver complexity.
Brief description of the drawings
Accompanying drawing 1 is existing intercom receiver demodulating system schematic diagram；
Accompanying drawing 2 is the utility model intercom receiver demodulating system schematic diagram；
Accompanying drawing 3 is that the first intermediate-freuqncy signal is converted into frequency discrimination output signal circuit diagram by the utility model；
Accompanying drawing 4 is that the utility model carries out sampling processing circuit figure to frequency discrimination output signal.
Embodiment
With reference to the drawings and specific embodiments, the utility model is described in further detail.It should be understood that these embodiments are only used for
Illustrate the utility model rather than limit scope of the present utility model.In addition, it is to be understood that reading the utility model instruction
Content after, those skilled in the art can make various changes or modifications to the utility model, and these equivalent form of values equally fall
In scope defined herein.
As shown in Figure 2, preamplifier of the present utility model, the first frequency mixer, the first intermediate frequency amplifier, the second mixing
Device, the second intermediate frequency amplifier, frequency discriminator, A/D converter and digital signal processor are sequentially connected, between modules can be with
The signal conditioning circuits such as filter circuit are set.The rate of connections synthesizer on the first frequency mixer.Wherein,
Preamplifier is connected with receiving circuit and antenna, is suitable for according to demand amplifying received signal strength；
Frequency synthesizer, it is connected with the first frequency mixer, is adapted to provide for local oscillation signal needed for the first frequency mixer；
First frequency mixer, the second frequency mixer are suitable for the reception signal frequency after amplification to be reduced to required for frequency discriminator
Frequency；
Frequency discriminator, it is adaptable to frequency-modulated wave frequency discrimination, frequency modulated signal is reduced to the modulated signal of emitter；
A/D converter, is suitable for the data signal converted analog signals into needed for subsequent digital signal processor.
Concrete operating principle of the present utility model is as follows：
The radiofrequency signal that antenna is received is converted into first after preamplifier amplifies and filters into the first frequency mixer
Intermediate frequency, the first intermediate-freuqncy signal after amplification is in the second intermediate frequency that the further frequency reducing of the second frequency mixer is hundreds of kilo hertzs, and frequency discriminator is again
Second intermediate-freuqncy signal is converted into low frequency signal of the spectrum distribution in [- 12.5KHz, 12.5KHz], this low frequency signal passes through A/
Enter digital signal processor after D converter samplings, completion timing is synchronous in digital signal processor, adjudicates and recovers number
According to.
As shown in Figure 3, it is that the first IF signal processing is frequency discrimination output signal circuit diagram by the first IF process module,
First intermediate-freuqncy signal IF enters the first IF process module and carries out double conversion, amplitude limit and frequency discrimination, forms frequency discrimination output signal
Pin 19,20,21,22,23 is MCU control signals in DEMOD, Fig. 3, by MCU controls.It is at A/D samplers shown in accompanying drawing 4
Frequency discrimination output signal circuit diagram is managed, frequency discrimination output signal DEMOD enters A/D samplers, and digital signal processor is entered after sampling
Further processing.Pin 21,23,24 is MCU control signals in Fig. 4, and by MCU controls, pin 3,4,5,6,7 is connected to digital letter
Number processor.
The utility model is adapted to be demodulated MFSK (such as 4FSK) signal, and it makes full use of the super of traditional analog intercom
Amplification, mixing and frequency discriminator in heterodyne reception circuit, the data volume of receiver A/D samplings are small, the work of follow-up signal processor
Make load low, so as to reduce cost and power consumption.
Claims (3)
1. a kind of digital handset receiver demodulating system, it is characterised in that：Including
The preamplifier being amplified to antenna input signal；
Preamplifier output signal is converted to the first frequency mixer of the first intermediate frequency；
The frequency synthesizer of local oscillation signal is provided for the first frequency mixer；
Amplify the first intermediate frequency amplifier of the first intermediate-freuqncy signal；
First intermediate-freuqncy signal is converted to the second frequency mixer of the second intermediate frequency；
Amplify the second intermediate frequency amplifier of the second intermediate-freuqncy signal；
Second intermediate-freuqncy signal is reduced to the frequency discriminator of emitter modulated signal；
The A/D converter sampled to frequency discriminator output signal；
To the digital signal processor of the further processing of sampled signal.
2. a kind of digital handset receiver demodulating system as claimed in claim 1, it is characterised in that：The frequency discriminator and A/
Signal conditioning circuit is additionally provided between D converters.
3. a kind of digital handset receiver demodulating system as claimed in claim 2, it is characterised in that：The signal condition electricity
Road includes wave filter and amplifier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720068304.0U CN206349990U (en) | 2017-01-18 | 2017-01-18 | A kind of digital handset receiver demodulating system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720068304.0U CN206349990U (en) | 2017-01-18 | 2017-01-18 | A kind of digital handset receiver demodulating system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206349990U true CN206349990U (en) | 2017-07-21 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201720068304.0U Active CN206349990U (en) | 2017-01-18 | 2017-01-18 | A kind of digital handset receiver demodulating system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106788512A (en) * | 2017-01-18 | 2017-05-31 | 深圳市楷诺无线通信有限公司 | A kind of digital handset receiver demodulating system |
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2017
- 2017-01-18 CN CN201720068304.0U patent/CN206349990U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106788512A (en) * | 2017-01-18 | 2017-05-31 | 深圳市楷诺无线通信有限公司 | A kind of digital handset receiver demodulating system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20180110 Address after: 518000 Guangdong province Baoan District Xin'an Wenhui Street Community in Shenzhen city along Connaught platinum Plaza No. 269 Road 328 Patentee after: Shenzhen City Kai UNITA Wireless Communication Co. Ltd. Address before: Shenzhen City, Guangdong province Baoan District 518101 a Lunuo platinum Plaza Room 301-28 Patentee before: Shenzhen City Kai Connaught Wireless Communication Co. Ltd. |
|
| TR01 | Transfer of patent right |