CN210112018U - Digital audio broadcasting receiver - Google Patents
Digital audio broadcasting receiver Download PDFInfo
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- CN210112018U CN210112018U CN201921531311.5U CN201921531311U CN210112018U CN 210112018 U CN210112018 U CN 210112018U CN 201921531311 U CN201921531311 U CN 201921531311U CN 210112018 U CN210112018 U CN 210112018U
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Abstract
The embodiment of the utility model discloses digital audio broadcasting receiver, digital audio broadcasting receiver includes: RF circuit, resonator, digital signal processor, digital-to-analog converter, low frequency amplifier, controller, IGBT module and power module, wherein: the signal end of the RF circuit is connected with the resonator, the signal end of the resonator is connected with the digital signal processor, the signal end of the digital signal processor is connected with the digital-to-analog converter, the signal end of the low-frequency amplifier is connected with the loudspeaker, the power supply end of the low-frequency amplifier is connected with the power supply module, the power supply end of the low-frequency amplifier is acted on the power supply module by the IGBT module to form a power supply path, and the signal end of the controller is connected with the IGBT module. The embodiment of the utility model provides an in, realize the supply of power to the low frequency amplifier through controller adaptive control IGBT module, guarantee power module input power's safety controllability.
Description
Technical Field
The utility model relates to a digital audio frequency technical field especially relates to a digital audio broadcasting receiver.
Background
The digital audio broadcasting is the third generation broadcasting following the AM and FM broadcasting, which all adopts the latest digital processing mode to carry out audio broadcasting, has the Dolby noise reduction function, has the characteristics of small distortion, low noise and accurate sound range positioning, and can really bring high-fidelity stereo enjoyment if a user is matched with equipment such as a power amplifier, a sound box and the like. DAB adopts advanced digital technology, namely Orthogonal Frequency Division Multiplexing (OFDM), can transmit CD-quality stereo programs under extremely low data transmission rate and distortion, can solve the problems of poor reception and interference of the traditional analog broadcasting, and can further provide barrier-free received data service. Taking Eureka-147 as an example, the Frequency video program content requirement divides the bandwidth into multiple sets of audio signals, additional data and compressed data, and the audio signals, additional data and compressed data are multiplexed and modulated by ofdm (orthogonal Frequency Division multiplexing) to be transmitted in the bandwidth of 1.5 MHz. The major characteristic of Eureka-147 is that it utilizes guard band (Guardband) and interleaving code (Interleave) to avoid selective fading and Intersymbol Interference caused by multipath and doppler effect, and only uses one Frequency to achieve full coverage, i.e. so-called Single Frequency Network (SFN), so that even if multiple transmitting stations broadcast the same program on the same channel at the same time, the full coverage can be achieved without generating co-channel Interference.
The power module adopted by the existing digital audio broadcasting receiving directly realizes the input of a switching power supply aiming at a low-frequency amplifier, but the circuit structure is lack of corresponding control, and the defects that the overvoltage or undervoltage of the input power supply of the whole power module cannot be controlled in a self-adaptive mode and the like can also be caused.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome prior art not enough, the utility model provides a digital audio broadcasting receiver realizes the power to the supply of low frequency amplifier, ensures the safety controllability of power module input power through controller adaptive control IGBT module.
In order to solve the above problem, the utility model provides a digital audio broadcasting receiver, digital audio broadcasting receiver includes: RF circuit, resonator, digital signal processor, digital-to-analog converter, low frequency amplifier, controller, IGBT module and power module, wherein: the signal end of the RF circuit is connected with the resonator, the signal end of the resonator is connected with the digital signal processor, the signal end of the digital signal processor is connected with the digital-to-analog converter, the signal end of the low-frequency amplifier is connected with the loudspeaker, the power supply end of the low-frequency amplifier is connected with the power supply module, the power supply end of the low-frequency amplifier is acted on the power supply module by the IGBT module to form a power supply path, and the signal end of the controller is connected with the IGBT module.
An antenna is coupled to the RF circuitry.
The resonator includes a PLL circuit and a PLL sync detector.
The digital signal processor comprises an OFDM demodulator, a de-interleaver, a Viterbi decoder, a CH decoder and an MPEG decoder.
The controller is also provided with a voltage detection unit, and a detection point of the voltage detection unit is positioned at a power supply end of the low-frequency amplifier.
The IGBT module includes: the IGBT driving device comprises an IGBT protection circuit, an IGBT unit and an IGBT driver, wherein a signal end of the IGBT driver is connected with the controller and the IGBT unit, and a power supply end of the IGBT protection circuit is connected with a power supply module and the IGBT unit.
The embodiment of the utility model provides an in, can realize forming the switch route on the IGBT unit based on this structure can be realized ordering about of PWM signal to IGBT driver, IGBT protection circuit's drive function through the controller based on the PWM signal, reach power module and to low frequency amplifier's power supply control, when the PWM signal orders about, also come the security guarantee under the power input to the IGBT unit through an effectual safety circuit. The utility model discloses can be under the effect of controller, can detect the power signal of power supply end on the low frequency amplifier based on the voltage detection unit on the controller to with signal feedback to IGBT protection circuit, in order to reach the controlled process of power on the corresponding circuit.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic circuit diagram of a digital audio broadcasting receiver according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a resonator circuit according to an embodiment of the present invention;
fig. 3 is another schematic circuit diagram of a digital audio broadcasting receiver according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
An Insulated Gate Bipolar Transistor (IGBT) is a composite fully-controlled voltage-driven power semiconductor device consisting of a Bipolar Junction Transistor (BJT) and an insulated Gate field effect transistor (MOS), and has the advantages of high input impedance of the MOSFET and low conduction voltage drop of the GTR.
Fig. 1 shows a schematic circuit diagram of a digital audio broadcasting receiver in an embodiment of the present invention, the digital audio broadcasting receiver includes: RF circuit, resonator, digital signal processor, digital-to-analog converter, low frequency amplifier, controller, IGBT module and power module, wherein: the signal end of the RF circuit is connected with the resonator, the signal end of the resonator is connected with the digital signal processor, the signal end of the digital signal processor is connected with the digital-to-analog converter, the signal end of the low-frequency amplifier is connected with the loudspeaker, the power supply end of the low-frequency amplifier is connected with the power supply module, the power supply end of the low-frequency amplifier is acted on the power supply module by the IGBT module to form a power supply path, and the signal end of the controller is connected with the IGBT module.
The RF circuit is connected to an antenna, and the RF circuit may convert a radio frequency signal received by the digital audio broadcasting receiver into an analog baseband signal or a digital baseband signal, etc.
Fig. 2 shows a schematic diagram of a circuit structure of a resonator in an embodiment of the present invention, where the resonator includes a PLL circuit and a PLL synchronization detector, the PLL circuit can implement arbitrary frequency adjustment and selection, and the PLL synchronization detector can detect whether synchronization of the PLL circuit is established or not.
The digital signal processor may perform Orthogonal Frequency Division Multiplexing (OFDM) demodulation on the intermediate frequency band signal generated by the tuner, i.e., the digital signal processor includes an OFDM demodulator, a deinterleaver, a viterbi decoder, a CH decoder, an MPEG decoder, and the like. The deinterleaver detects an error rate of the digital signal in the OFDM demodulator. The CH decoder reproduces related audio data and the like using data output from the OFDM demodulator, and the MPEG decoder reproduces related audio data and the like using data output from the OFDM decoder.
Specifically, fig. 3 further shows another schematic circuit diagram of a digital audio broadcasting receiver in an embodiment of the present invention, where the digital audio broadcasting receiver includes: RF circuit, resonator, digital signal processor, digital-to-analog converter, low frequency amplifier, controller, IGBT module and power module, wherein: the signal end of the RF circuit is connected with the resonator, the signal end of the resonator is connected with the digital signal processor, the signal end of the digital signal processor is connected with the digital-to-analog converter, the signal end of the low-frequency amplifier is connected with the loudspeaker, the power supply end of the low-frequency amplifier is connected with the power supply module, the power supply end of the low-frequency amplifier is acted on the power supply module by the IGBT module to form a power supply path, and the signal end of the controller is connected with the IGBT module.
The RF circuit is connected to an antenna, and the RF circuit may convert a radio frequency signal received by the digital audio broadcasting receiver into an analog baseband signal or a digital baseband signal, etc.
The resonator includes a PLL circuit that can realize arbitrary frequency adjustment and selection, a PLL synchronization detector that can detect whether or not synchronization of the PLL circuit is established, and the like.
The digital signal processor may perform Orthogonal Frequency Division Multiplexing (OFDM) demodulation on the intermediate frequency band signal generated by the tuner, i.e., the digital signal processor includes an OFDM demodulator, a deinterleaver, a viterbi decoder, a CH decoder, an MPEG decoder, and the like. The deinterleaver detects an error rate of the digital signal in the OFDM demodulator. The CH decoder reproduces related audio data and the like using data output from the OFDM demodulator, and the MPEG decoder reproduces related audio data and the like using data output from the OFDM decoder.
The controller is also provided with a voltage detection unit, and a detection point of the voltage detection unit is positioned at a power supply end of the low-frequency amplifier.
The IGBT module includes: the IGBT driving device comprises an IGBT protection circuit, an IGBT unit and an IGBT driver, wherein a signal end of the IGBT driver is connected with the controller and the IGBT unit, and a power supply end of the IGBT protection circuit is connected with a power supply module and the IGBT unit. The controller can realize the driving function of the IGBT driver and the IGBT protection circuit based on the PWM signal, and can realize that the IGBT unit is driven by the PWM signal to form a switch path based on the structure, so that the power supply module can control the power supply of the low-frequency amplifier, and the safety of the IGBT unit under the power input can be ensured by an effective safety circuit when the IGBT unit is driven by the PWM signal. The utility model discloses can be under the effect of controller, can detect the power signal of power supply end on the low frequency amplifier based on the voltage detection unit on the controller to with signal feedback to IGBT protection circuit, in order to reach the controlled process of power on the corresponding circuit.
In addition, the digital audio broadcasting receiver provided by the embodiment of the present invention is described in detail above, and the principle and the implementation of the present invention are explained by applying a specific example herein, and the description of the above embodiment is only used to help understanding the method and the core idea of the present invention; meanwhile, for the general technical personnel in the field, according to the idea of the present invention, there are changes in the specific implementation and application scope, to sum up, the content of the present specification should not be understood as the limitation of the present invention.
Claims (6)
1. A digital audio broadcast receiver, characterized in that the digital audio broadcast receiver comprises: RF circuit, resonator, digital signal processor, digital-to-analog converter, low frequency amplifier, controller, IGBT module and power module, wherein: the signal end of the RF circuit is connected with the resonator, the signal end of the resonator is connected with the digital signal processor, the signal end of the digital signal processor is connected with the digital-to-analog converter, the signal end of the low-frequency amplifier is connected with the loudspeaker, the power supply end of the low-frequency amplifier is connected with the power supply module, the power supply end of the low-frequency amplifier is acted on the power supply module by the IGBT module to form a power supply path, and the signal end of the controller is connected with the IGBT module.
2. The digital audio broadcast receiver of claim 1 wherein the RF circuit is coupled to an antenna.
3. The digital audio broadcast receiver of claim 1, wherein the resonator comprises a PLL circuit and a PLL synchronization detector.
4. The digital audio broadcast receiver of claim 1 wherein the digital signal processor comprises an OFDM demodulator, a deinterleaver, a viterbi decoder, a CH decoder, an MPEG decoder.
5. The digital audio broadcasting receiver of claim 1, wherein the controller is further provided with a voltage detecting unit, and a detection point of the voltage detecting unit is located at a power supply terminal of the low frequency amplifier.
6. The digital audio broadcast receiver of any of claims 1 to 5, wherein the IGBT module comprises: the IGBT driving device comprises an IGBT protection circuit, an IGBT unit and an IGBT driver, wherein a signal end of the IGBT driver is connected with the controller and the IGBT unit, and a power supply end of the IGBT protection circuit is connected with a power supply module and the IGBT unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921531311.5U CN210112018U (en) | 2019-09-12 | 2019-09-12 | Digital audio broadcasting receiver |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921531311.5U CN210112018U (en) | 2019-09-12 | 2019-09-12 | Digital audio broadcasting receiver |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210112018U true CN210112018U (en) | 2020-02-21 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921531311.5U Active CN210112018U (en) | 2019-09-12 | 2019-09-12 | Digital audio broadcasting receiver |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210112018U (en) |
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2019
- 2019-09-12 CN CN201921531311.5U patent/CN210112018U/en active Active
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