WO2012006857A1 - Integrated talkback chip and integrated talkback system including the chip - Google Patents

Integrated talkback chip and integrated talkback system including the chip Download PDF

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Publication number
WO2012006857A1
WO2012006857A1 PCT/CN2010/080308 CN2010080308W WO2012006857A1 WO 2012006857 A1 WO2012006857 A1 WO 2012006857A1 CN 2010080308 W CN2010080308 W CN 2010080308W WO 2012006857 A1 WO2012006857 A1 WO 2012006857A1
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signal
intercom
digital
integrated
processing
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PCT/CN2010/080308
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French (fr)
Chinese (zh)
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蔡东志
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深圳市力同亚太科技有限公司
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Publication of WO2012006857A1 publication Critical patent/WO2012006857A1/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M11/00—Telephonic communication systems specially adapted for combination with other electrical systems
    • H04M11/02—Telephonic communication systems specially adapted for combination with other electrical systems with bell or annunciator systems
    • H04M11/025—Door telephones
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F9/00—Arrangements for program control, e.g. control units
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F30/00—Computer-aided design [CAD]
    • G06F30/30—Circuit design
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M11/00—Telephonic communication systems specially adapted for combination with other electrical systems

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  • the present invention relates to the field of wireless communications, and in particular to an integrated intercom chip and an integrated intercom system including the same.
  • the existing walkie-talkies are divided into two categories: professional machines and civilian machines (public walkie-talkies).
  • Professional machine refers to a machine with a transmission power greater than 4W, which mainly satisfies the application of long distance to the call, such as: public security, security and professional mountaineers;
  • civil machine refers to a machine with a transmission power of not more than 0.5W, which mainly satisfies the call distance.
  • the present invention provides an integrated intercom chip and an integrated intercom system including the same, which is small in size, low in cost, and high in reliability.
  • the integrated intercom chip of the present invention adopts the following technical solutions:
  • An integrated intercom chip comprising a central processing part, an intercom processing part and a digital interface control part, the intercom processing part is configured to implement intercom signal transceiving processing, and the central processing part is connected to the digital interface control part
  • the digital interface control portion is connected to the intercom processing portion, and the central processing portion controls an operation state and a parameter of the intercom processing portion through the digital interface control portion; the central processing portion and the intercom processing
  • the partial and digital interface control section uses digital signal technology and is integrated on a single chip through a CMOS process.
  • the central processing portion and the intercom processing portion share a crystal.
  • the intercom processing portion includes a radio frequency receiving portion, a radio frequency transmitting portion, and a baseband signal processing portion;
  • the radio frequency receiving portion is configured to receive a radio frequency signal and demodulate the output speech signal And a signaling signal to the baseband signal processing portion;
  • the baseband signal processing portion is configured to perform baseband processing on the demodulated output voice signal and the signaling signal, and is also used for baseband transmitting the voice signal and the signaling signal
  • the processing is input to the radio frequency transmitting part;
  • the radio frequency transmitting part is a transmitting circuit of a direct phase-locked loop frequency integrated form, and the circuit comprises: a frequency modulation depth adjuster, a fractional phase-locked loop frequency synthesizer and a power amplifier, and the frequency modulation
  • the depth adjuster is configured to perform FM depth adjustment on the input voice signal and the signaling signal;
  • the fractional phase-locked loop frequency synthesizer is configured to perform digital direct modulation modulation on the signal outputted by the FM depth adjuster to generate
  • the radio frequency receiving portion is a receiving circuit in the form of a low intermediate frequency.
  • the receiving circuit of the low intermediate frequency form comprises: a low noise amplifier, a quadrature mixer, two intermediate frequency signal processing units, and a digital FM demodulator;
  • the low noise amplifier is configured to perform low noise amplification on the received RF signal and And outputting to the quadrature mixer in two ways;
  • the quadrature mixer is used for mixing and transforming two orthogonal intermediate frequency signals and outputting to two intermediate frequency signal processing units respectively;
  • the input intermediate frequency signal is processed to output an intermediate frequency digital signal;
  • the digital frequency modulation demodulator is configured to demodulate the input two intermediate frequency digital signals, and respectively output the voice signal and the signaling signal.
  • the baseband signal processing part includes a receiving voice processing unit, a transmitting voice processing unit, and a signaling signal processing unit; the signaling signal processing unit is configured to perform filtering and shaping processing on the received or transmitted signaling signal; and the receiving voice processing The unit is configured to perform digital-to-analog conversion and filtering and amplification processing on the voice signal outputted by the radio frequency receiving portion, and the output voice processing unit is configured to sequentially filter, digital-analog, convert, and output the transmitted voice signal input by the outside world. Go to the RF transmitter section.
  • the central processing portion is a DSP core.
  • the present invention also provides an integrated intercom system including the above integrated intercom chip.
  • the integrated intercom system further includes a GPS module, and the GPS module is connected to the integrated intercom chip.
  • the integrated intercom chip of the invention adopts the digital signal processing technology and integrates the circuit of the intercom transceiver, the central control and the like into one chip through the CMOS process, and the intercom function can be completed with only a few peripheral devices, and the integration is high.
  • the whole machine has low cost; it not only solves the problem that the traditional analog intercom system has complicated circuit structure, many discrete components and high production cost, but also greatly improves the technical parameters and stability of the product.
  • FIG. 1 is a block diagram showing the circuit structure of an integrated intercom chip according to an embodiment of the present invention
  • FIG. 2 is a schematic structural diagram of an integrated intercom system according to an embodiment of the present invention.
  • FIG. 3 is a schematic structural diagram of another integrated intercom system according to an embodiment of the present invention.
  • an integrated intercom chip includes a central processing unit (MCU), an intercom processing part, and a digital interface control part, where the intercom processing part is configured to implement intercom signal transceiving processing.
  • the central processing portion is connected to the digital interface control portion, the digital interface control portion is connected to the intercom processing portion, and the central processing portion controls the operation of the intercom processing portion through the digital interface control portion Status and parameters; the central processing portion, the intercom processing portion, and the digital interface control portion employ digital signal technology and are integrated on one chip by a CMOS process.
  • the intercom processing part and the central processing part can share one crystal oscillator, thereby avoiding intermodulation interference of multiple signal sources.
  • the intercom processing section includes a radio frequency receiving section 1, a radio frequency transmitting section 2, and a baseband signal processing section 3.
  • the radio frequency receiving section 1 includes a low noise amplifier 11, a mixer 12, a low pass filter 13, a programmable amplifier 14, a first analog to digital converter 15, a digital processing unit 16, and a digital FM demodulator 17.
  • the radio frequency transmitting section 2 includes an FM depth adjuster 21, a phase locked loop frequency synthesizer 22, and a power amplifier 23.
  • the baseband signal processing section 3 includes a filter shaper 331, a first speech filter 311, a digital to analog converter 312, a speech amplifier 313, a second analog to digital converter 321, a second digital filter 322, and a second speech filter 323. .
  • the radio receiving part 1 adopts a receiving circuit form of a low intermediate frequency structure.
  • the input RF signal first reaches the low noise amplifier 11.
  • the low noise amplifier 11 is a differential low noise amplifier. After low noise differential amplification, it is divided into two channels and fed to the quadrature mixer 12, which can directly convert the RF signal to a low intermediate frequency.
  • the mixer typically performs high sideband mixing, and the local oscillator signal is higher (or lower) than the RF frequency, which makes the frequency higher (or The image frequency below twice the RF frequency is also converted to the intermediate frequency, which brings image frequency interference.
  • the low intermediate frequency structure adopted in this embodiment can not only achieve high integration, but also effectively reduce off-chip discrete components, avoiding the use of an external RF image suppression filter, and reducing the overall cost.
  • the quadrature mixer 12 outputs two orthogonal intermediate frequency signals, that is, an I signal and a Q signal, which are respectively sent to two intermediate frequency signal processing units.
  • the intermediate frequency signal processing unit includes a low pass filter 13, a programmable amplifier 14, a first analog to digital converter 15, and a digital signal processing unit 16.
  • the I signal and the Q signal first enter the low pass filter 13 on the respective path, and the low pass filter 13 is a third-order Chebyshev filter.
  • the main function is to increase the adjacent channel selectivity of the system and improve the system resistance. Blocking performance.
  • the filtered IF signal is amplified by a programmable amplifier 14 whose gain is defined by its internal register or digital AGC (Automatic Gain Control, automatic gain control) circuit settings. Thereafter, the intermediate frequency signal is input to the first analog to digital converter 15 to be converted into an intermediate frequency digital signal.
  • AGC Automatic Gain Control, automatic gain control
  • the intermediate frequency digital signal is then input to digital processing unit 16 for digital processing, wherein digital processing unit 16 includes a first digital filter 161, a sampler 162, a finite impulse response filter 163, and a numerically controlled oscillator 164 for The sampler 162 is provided with a numerically controlled local oscillator signal at the time of sampling, and the first digital filter 161, the sampler 162, and the finite impulse response (FIR) filter 163 sequentially filter and sample the digital signal, and then filter by the finite impulse response.
  • the 163 filters out all out-of-band interference.
  • the digitally processed two orthogonal IF digital signals finally arrive at the digital FM demodulator 17 to demodulate the signaling signal and the speech signal, respectively.
  • the radio frequency transmission path the externally transmitted transmitted speech signal and the signaling signal are processed by the baseband signal processing section 3, and then first reach the FM depth adjuster 21 in the radio frequency transmitting section 2 to perform the FM depth adjustment, and then sent to the phase locked loop frequency synthesis.
  • the device 22 performs digital direct modulation modulation to generate a stable modulated RF carrier signal, and the modulated RF carrier signal is amplified and transmitted by the power amplifier 23.
  • the entire RF transmitting portion 2 is a transmitting circuit of a direct phase-locked loop frequency integrated form.
  • the baseband signal processing section 3 is mainly divided into three units: a receiving speech processing unit, a transmitting speech processing unit, and a signaling signal processing unit.
  • the signaling signal processing unit is a filter shaper 331 for filtering and shaping the signaling signal received (received from the digital FM demodulator 17) or transmitted (input by the outside, sent to the FM depth adjuster 21).
  • the received speech processing unit includes a first speech filter 311, a digital to analog converter 312, and a speech amplifier 313.
  • the speech signal output from the digital FM demodulator 17 is sequentially filtered, digital-analog converted, and amplified by the first speech filter 311, the digital-to-analog converter 312, and the speech amplifier 313.
  • the transmit speech processing unit includes a second analog to digital converter 321, a second digital filter 322, and a second speech filter 323.
  • the transmitted speech signal input from the outside is first converted into a digital signal by the second analog-to-digital converter 321, and then filtered out by the second digital filter 322, finally filtered by the second speech filter 323, and output to the radio-frequency transmitting portion. 2.
  • the second analog-to-digital converter 321 uses a high-performance Delta-Sigma analog-to-digital converter with a sampling frequency that is consistent with the clock frequency of the entire integrated intercom chip. This choice allows the front end to eliminate the need for an anti-aliasing filter.
  • a voltage controlled oscillator (not shown) in the phase locked loop frequency synthesizer 22 operates at 1.4 GHz to 2 GHz to avoid the drag effect of the power amplifier 23. The voltage controlled oscillator is divided to output the frequency range required by the intercom module.
  • the phase-locked loop frequency synthesizer 22 also supplies the local oscillator signal to the mixer 12 to avoid that the mixer needs to additionally use other devices to obtain the local oscillator signal.
  • the phase-locked loop frequency synthesizer 22 uses a high-performance fractional-phase-locked loop frequency synthesizer to achieve low-phase noise, extremely fast phase-locking time, and high-performance, low-cost design with adjustable frequency points.
  • the digital interface control part 4 the radio frequency receiving part 1, the radio frequency transmitting part 2 and the baseband signal processing part 3 can be controlled by the MCU through the digital interface control part 4, and the working states and parameters of the above three parts are adjusted, including the receiving gain, Various parameters such as frequency modulation gain, frequency, RF transceiver control, and loop characteristics of the phase-locked loop frequency synthesizer are transmitted.
  • the digital interface control section 4 employs, for example, an I2C bus as a bidirectional control bus to implement interaction and control with the MCU.
  • the three-wire or four-wire SPI bus can be used as a control bus to realize interaction and control with the MCU.
  • the MCU in accordance with the I2C format, the MCU generates a corresponding control word, addresses the digital interface control portion, determines the read/write mode, and then reads or writes the data.
  • the MCU can be the processor of the DSP core, and the same can be other types of control devices.
  • the integrated power management of the intercom chip provides a stable DC power supply for each functional device in the chip through the built-in low-dropout linear regulator circuit and control circuit.
  • FIG. 2 shows an integrated intercom system including the above integrated intercom chip.
  • the MCU 5 mainly completes the intercom processing part through the connection with the digital interface control part 4 of the integrated intercom chip. (including the interaction of the radio frequency receiving section 1, the radio frequency transmitting section 2, and the baseband signal processing section 3).
  • the radio frequency signal is sequentially input to the integrated intercom chip through the antenna switch and the filter, and the intercom processing part performs the foregoing processing on the radio frequency signal, outputs the speech signal to the speaker (horn), and outputs the signaling signal to the MCU 5, and the MCU 5 according to the
  • the signaling signal controls the output state of the voice signal: the signaling signal is compared with the preset value in the MCU 5.
  • the central processing section 5 controls to turn on the speaker to release the voice signal. If different, the speaker is turned off, and the speaker is not released. voice signal.
  • the transmitted voice is converted into an audio electric signal by the receiver (microphone), and the intermodulation processing part processes and outputs the digital FM modulated signal, and then generates a rated RF power through the power amplifier, and then transmits the antenna through the antenna switch, and the MCU5 simultaneously generates the signaling signal.
  • the incoming intercom processing part is processed by the intercom processing part and transmitted together with the speech signal.
  • the integrated intercom system includes a keyboard input unit for, for example, a control command input and a display unit to perform, for example, a display output to facilitate use of the integrated intercom system.
  • the integrated intercom system of the embodiment of the present invention may further include a GPS module, and the GPS module is connected to the integrated intercom chip.
  • the GPS positioning information obtained by the GPS module can be transmitted by integrating the intercom chip, thereby providing the location information of the intercom system holder to the assistance personnel in, for example, a rescue operation.
  • the integrated intercom chip and the integrated intercom system of the invention solve the problems of complicated circuit structure differentiation, multiple discrete components and poor stability of the traditional analog signal processing technology. It greatly simplifies product design and reduces costs, and improves the technical content and intelligent design of the product.
  • the integrated intercom chip can be embedded in a mobile phone or the like, and a mobile phone or other product having an intercom function can also be realized.

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Abstract

An integrated talkback chip and an integrated talkback system including the chip are disclosed. The integrated chip includes a CPU, a talkback processing part and a digital interface control part(4). The talkback processing part is used for performing talkback signal receiving and transmitting processes; the CPU is connected with the digital interface control part(4); and the digital interface control part(4) is connected with the talkback processing part. The CPU controls the working state and parameters of the talkback processing part via the digital interface control part(4). The CPU, the talkback processing part and the digital interface control part(4) are integrated in a chip by a digital signal technology and CMOS technology. The solutions are of high integration level and the cost of the complete machine is cheap, which not only solve the problems of the traditional analog interphone that the circuit construct is complex, there are a lot of separate elements and the cost is high, but also greatly improve the technique parameters and the stability of the product.

Description

一种集成对讲芯片及包括该芯片的集成对讲***  Integrated intercom chip and integrated intercom system including the same 技术领域Technical field
本发明涉及无线通讯领域，具体地说涉及一种集成对讲芯片及包括该芯片的集成对讲***。 The present invention relates to the field of wireless communications, and in particular to an integrated intercom chip and an integrated intercom system including the same.
背景技术Background technique
现有的对讲机分为专业机和民用机（公众对讲机）两大类。专业机是指发射功率大于4W的机器，主要满足对通话距离较远的应用，如：公安、保安和专业登山运动员等；民用机是指发射功率不大于0.5W的机器，主要满足对通话距离要求不严的应用，如：酒楼、旅馆、展览会和外出旅游等；目前的对讲机市场上，无论是专业机还是民用机，主导技术都是基于锁相环频率合成技术和接收二次变频的超外差式模拟信号处理技术；其优势是技术成熟、进入门槛较低，因而得到广泛的应用。但是，随着对讲机向体积小、成本低、功能强、可靠性高、更商品化的趋势发展，这种传统的模拟信号处理技术也表现出来越来越多的问题。如：电路结构分化复杂、分立元器件多达几百上千个，严重的限制了对讲机产品的研发创新；此外其产品生产调试复杂，稳定性和技术参数的一致性差、成本高。 The existing walkie-talkies are divided into two categories: professional machines and civilian machines (public walkie-talkies). Professional machine refers to a machine with a transmission power greater than 4W, which mainly satisfies the application of long distance to the call, such as: public security, security and professional mountaineers; civil machine refers to a machine with a transmission power of not more than 0.5W, which mainly satisfies the call distance. Less demanding applications, such as: restaurants, hotels, exhibitions and outings; in the current walkie-talkie market, whether it is professional or civilian, the dominant technology is based on phase-locked loop frequency synthesis technology and receiving secondary frequency conversion Ultra-heterodyne analog signal processing technology; its advantages are mature technology, low barriers to entry, and thus wide application. However, with the trend of small size, low cost, strong function, high reliability and more commercialization of the walkie-talkie, this traditional analog signal processing technology has also shown more and more problems. Such as: the circuit structure is complex, and there are hundreds of thousands of discrete components, which seriously limits the R&D innovation of the walkie-talkie products; in addition, the production and debugging of the products are complicated, the stability and technical parameters are poorly consistent, and the cost is high.
技术问题technical problem
有鉴于此，本发明提供了一种集成对讲芯片及包括该芯片的集成对讲***，体积小、成本低，可靠性强。 In view of this, the present invention provides an integrated intercom chip and an integrated intercom system including the same, which is small in size, low in cost, and high in reliability.
技术解决方案Technical solution
为解决上述技术问题，本发明的集成对讲芯片采用如下技术方案：In order to solve the above technical problem, the integrated intercom chip of the present invention adopts the following technical solutions:
一种集成对讲芯片，包括中央处理部分、对讲处理部分和数字接口控制部分，所述对讲处理部分用于实现对讲信号收发处理，所述中央处理部分与所述数字接口控制部分相连，所述数字接口控制部分与所述对讲处理部分相连，所述中央处理部分通过所述数字接口控制部分控制所述对讲处理部分的工作状态和参数；所述中央处理部分、对讲处理部分和数字接口控制部分采用数字信号技术并通过CMOS工艺集成在一片芯片上。An integrated intercom chip, comprising a central processing part, an intercom processing part and a digital interface control part, the intercom processing part is configured to implement intercom signal transceiving processing, and the central processing part is connected to the digital interface control part The digital interface control portion is connected to the intercom processing portion, and the central processing portion controls an operation state and a parameter of the intercom processing portion through the digital interface control portion; the central processing portion and the intercom processing The partial and digital interface control section uses digital signal technology and is integrated on a single chip through a CMOS process.
在所述集成对讲芯片的一种实施例中，所述中央处理部分和对讲处理部分共用一个晶振。In an embodiment of the integrated intercom chip, the central processing portion and the intercom processing portion share a crystal.
在所述集成对讲芯片的一种实施例中，所述对讲处理部分包含射频接收部分、射频发射部分和基带信号处理部分；所述射频接收部分用于接收射频信号并解调输出语音信号和信令信号到基带信号处理部分；所述基带信号处理部分用于对所述解调输出的语音信号和信令信号进行基带处理后输出，还用于把发送语音信号和信令信号进行基带处理后输入到所述射频发射部分；所述射频发射部分为直接锁相环频率综合形式的发射电路，该电路包括：调频深度调节器、小数锁相环频率综合器和功率放大器，所述调频深度调节器用于对输入的语音信号和信令信号进行调频深度调节；所述小数锁相环频率综合器用于对调频深度调节器调节后输出的信号完成数字直接调频调制，产生射频调制载波信号；所述功率放大器用于对所述射频调制载波信号进行功率放大后输出；所述射频接收部分、射频发射部分和基带信号处理部分采用数字信号处理技术并通过CMOS工艺集成在一块芯片上。In an embodiment of the integrated intercom chip, the intercom processing portion includes a radio frequency receiving portion, a radio frequency transmitting portion, and a baseband signal processing portion; the radio frequency receiving portion is configured to receive a radio frequency signal and demodulate the output speech signal And a signaling signal to the baseband signal processing portion; the baseband signal processing portion is configured to perform baseband processing on the demodulated output voice signal and the signaling signal, and is also used for baseband transmitting the voice signal and the signaling signal The processing is input to the radio frequency transmitting part; the radio frequency transmitting part is a transmitting circuit of a direct phase-locked loop frequency integrated form, and the circuit comprises: a frequency modulation depth adjuster, a fractional phase-locked loop frequency synthesizer and a power amplifier, and the frequency modulation The depth adjuster is configured to perform FM depth adjustment on the input voice signal and the signaling signal; the fractional phase-locked loop frequency synthesizer is configured to perform digital direct modulation modulation on the signal outputted by the FM depth adjuster to generate a radio frequency modulated carrier signal; The power amplifier is configured to perform power amplification and transmission on the radio frequency modulated carrier signal ; The radio frequency receiver section, the radio transmitting section and baseband signal processing section using digital signal processing technology and integrated by a CMOS process on a single chip.
所述射频接收部分为低中频形式的接收电路。The radio frequency receiving portion is a receiving circuit in the form of a low intermediate frequency.
所述低中频形式的接收电路包括：低噪声放大器、正交混频器、两路中频信号处理单元、数字调频解调器；所述低噪声放大器用于对接收的射频信号进行低噪声放大并分两路输出到所述正交混频器；所述正交混频器用于混频变换出两路正交中频信号分别输出到两路中频信号处理单元；所述两路中频信号处理单元分别对输入的中频信号进行处理，输出中频数字信号；所述数字调频解调器用于对输入的两路中频数字信号进行解调，分别输出语音信号和信令信号。The receiving circuit of the low intermediate frequency form comprises: a low noise amplifier, a quadrature mixer, two intermediate frequency signal processing units, and a digital FM demodulator; the low noise amplifier is configured to perform low noise amplification on the received RF signal and And outputting to the quadrature mixer in two ways; the quadrature mixer is used for mixing and transforming two orthogonal intermediate frequency signals and outputting to two intermediate frequency signal processing units respectively; the two intermediate frequency signal processing units respectively The input intermediate frequency signal is processed to output an intermediate frequency digital signal; the digital frequency modulation demodulator is configured to demodulate the input two intermediate frequency digital signals, and respectively output the voice signal and the signaling signal.
所述基带信号处理部分包括接收语音处理单元、发送语音处理单元、信令信号处理单元；所述信令信号处理单元用于对接收或发送的信令信号进行滤波整形处理；所述接收语音处理单元用于对所述射频接收部分输出的语音信号进行数模转换和滤波放大处理后输出；所述发送语音处理单元用于对外界输入的发送语音信号依次进行滤波、数模转换和放大后输出到射频发射部分。The baseband signal processing part includes a receiving voice processing unit, a transmitting voice processing unit, and a signaling signal processing unit; the signaling signal processing unit is configured to perform filtering and shaping processing on the received or transmitted signaling signal; and the receiving voice processing The unit is configured to perform digital-to-analog conversion and filtering and amplification processing on the voice signal outputted by the radio frequency receiving portion, and the output voice processing unit is configured to sequentially filter, digital-analog, convert, and output the transmitted voice signal input by the outside world. Go to the RF transmitter section.
所述中央处理部分为DSP内核。The central processing portion is a DSP core.
本发明还提供了一种包括上述集成对讲芯片的集成对讲***。The present invention also provides an integrated intercom system including the above integrated intercom chip.
所述集成对讲***还包括GPS模块，所述GPS模块与所述集成对讲芯片相连。The integrated intercom system further includes a GPS module, and the GPS module is connected to the integrated intercom chip.
本发明的集成对讲芯片，采用数字信号处理技术并通过CMOS工艺将对讲收发、中央控制等电路都集成在一片芯片内，仅需极少的***器件即可完成对讲功能，集成度高，整机成本低廉；不仅解决了传统模拟对讲***技术电路结构分化复杂、分立元器件多、生产成本高的问题，而且极大地改善了产品的技术参数和稳定性。The integrated intercom chip of the invention adopts the digital signal processing technology and integrates the circuit of the intercom transceiver, the central control and the like into one chip through the CMOS process, and the intercom function can be completed with only a few peripheral devices, and the integration is high. The whole machine has low cost; it not only solves the problem that the traditional analog intercom system has complicated circuit structure, many discrete components and high production cost, but also greatly improves the technical parameters and stability of the product.
附图说明DRAWINGS
图1是本发明实施例的集成对讲芯片的电路结构框图；1 is a block diagram showing the circuit structure of an integrated intercom chip according to an embodiment of the present invention;
图2是本发明实施例的集成对讲***的结构示意图；2 is a schematic structural diagram of an integrated intercom system according to an embodiment of the present invention;
图3是本发明实施例的另一种集成对讲***的结构示意图。FIG. 3 is a schematic structural diagram of another integrated intercom system according to an embodiment of the present invention.
本发明的实施方式Embodiments of the invention
下面对照附图结合具体实施方式对本发明作进一步说明。The present invention will be further described below in conjunction with the specific embodiments with reference to the accompanying drawings.
如图1所示，本发明具体实施方式的集成对讲芯片，包括中央处理部分（MCU）、对讲处理部分和数字接口控制部分，所述对讲处理部分用于实现对讲信号收发处理，所述中央处理部分与所述数字接口控制部分相连，所述数字接口控制部分与所述对讲处理部分相连，所述中央处理部分通过所述数字接口控制部分控制所述对讲处理部分的工作状态和参数；所述中央处理部分、对讲处理部分和数字接口控制部分采用数字信号技术并通过CMOS工艺集成在一片芯片上。其中，对讲处理部分和中央处理部分可以共用一个晶振，从而避免多个信号源的交调干扰。As shown in FIG. 1 , an integrated intercom chip according to an embodiment of the present invention includes a central processing unit (MCU), an intercom processing part, and a digital interface control part, where the intercom processing part is configured to implement intercom signal transceiving processing. The central processing portion is connected to the digital interface control portion, the digital interface control portion is connected to the intercom processing portion, and the central processing portion controls the operation of the intercom processing portion through the digital interface control portion Status and parameters; the central processing portion, the intercom processing portion, and the digital interface control portion employ digital signal technology and are integrated on one chip by a CMOS process. Wherein, the intercom processing part and the central processing part can share one crystal oscillator, thereby avoiding intermodulation interference of multiple signal sources.
对讲处理部分，包括射频接收部分1、射频发射部分2、基带信号处理部分3。射频接收部分1包括低噪声放大器11、混频器12、低通滤波器13、可编程放大器14、第一模数转换器15、数字处理单元16、数字调频解调器17。射频发射部分2包括调频深度调节器21、锁相环频率综合器22和功率放大器23。基带信号处理部分3，包括滤波整形器331、第一语音滤波器311、数模转换器312、语音放大器313、第二模数转换器321、第二数字滤波器322、第二语音滤波器323。下面分别对集成对讲芯片进行射频收发时的接收通路和发射通路作一描述：The intercom processing section includes a radio frequency receiving section 1, a radio frequency transmitting section 2, and a baseband signal processing section 3. The radio frequency receiving section 1 includes a low noise amplifier 11, a mixer 12, a low pass filter 13, a programmable amplifier 14, a first analog to digital converter 15, a digital processing unit 16, and a digital FM demodulator 17. The radio frequency transmitting section 2 includes an FM depth adjuster 21, a phase locked loop frequency synthesizer 22, and a power amplifier 23. The baseband signal processing section 3 includes a filter shaper 331, a first speech filter 311, a digital to analog converter 312, a speech amplifier 313, a second analog to digital converter 321, a second digital filter 322, and a second speech filter 323. . The following describes the receiving path and the transmitting path of the integrated intercom chip during RF transceiver:
射频接收通路：射频接收部分1采用低中频结构的接收电路形式。输入射频信号首先到达低噪声放大器11，低噪声放大器11为差分低噪声放大器，经过低噪声差分放大后分为两路送入到正交混频器12，可直接将射频信号转换至低中频。对于传统的二次超外差式变频技术，混频器典型的是执行高边带混频，本振信号比射频频率高出（或低于）一个中频，此种方式使得频率高出（或低于）射频频率两倍中频的像频也转换为中频，从而带来了像频干扰。而本实施例采用的低中频结构不仅能够实现高集成度，而且可以有效的减少片外分立元件，避免使用外置的射频镜像抑制滤波器，减少总体成本。Radio frequency receiving path: The radio receiving part 1 adopts a receiving circuit form of a low intermediate frequency structure. The input RF signal first reaches the low noise amplifier 11. The low noise amplifier 11 is a differential low noise amplifier. After low noise differential amplification, it is divided into two channels and fed to the quadrature mixer 12, which can directly convert the RF signal to a low intermediate frequency. For the traditional quadratic superheterodyne frequency conversion technology, the mixer typically performs high sideband mixing, and the local oscillator signal is higher (or lower) than the RF frequency, which makes the frequency higher (or The image frequency below twice the RF frequency is also converted to the intermediate frequency, which brings image frequency interference. The low intermediate frequency structure adopted in this embodiment can not only achieve high integration, but also effectively reduce off-chip discrete components, avoiding the use of an external RF image suppression filter, and reducing the overall cost.
正交混频器12输出两路正交的中频信号，即I路信号和Q路信号，分别送入两路中频信号处理单元。中频信号处理单元包括低通滤波器13、可编程放大器14、第一模数转换器15、数字信号处理单元16。The quadrature mixer 12 outputs two orthogonal intermediate frequency signals, that is, an I signal and a Q signal, which are respectively sent to two intermediate frequency signal processing units. The intermediate frequency signal processing unit includes a low pass filter 13, a programmable amplifier 14, a first analog to digital converter 15, and a digital signal processing unit 16.
I路信号和Q路信号首先进入各自通路上的低通滤波器13，该低通滤波器13为三阶切比雪夫滤波器，主要功能是增加***的邻道选择性，并提高***的抗阻塞性能。滤波后的中频信号由可编程放大器14进行放大，可编程放大器14的增益由其内部的寄存器或数字AGC（Automatic Gain Control，自动增益控制）电路设定。之后，中频信号输入到第一模数转换器15转换为中频数字信号。中频数字信号再输入到数字处理单元16进行数字处理，其中数字处理单元16包括第一数字滤波器161、抽样器162、有限冲激响应滤波器163和数控振荡器164，数控振荡器164用于给抽样器162提供采样时的数控本振信号，第一数字滤波器161、抽样器162、有限冲激响应（FIR）滤波器163依次对数字信号进行滤波、抽样，再由有限冲激响应滤波器163滤除掉所有的带外干扰。经过数字处理后的两路正交中频数字信号最后到达数字调频解调器17分别解调出信令信号和语音信号。The I signal and the Q signal first enter the low pass filter 13 on the respective path, and the low pass filter 13 is a third-order Chebyshev filter. The main function is to increase the adjacent channel selectivity of the system and improve the system resistance. Blocking performance. The filtered IF signal is amplified by a programmable amplifier 14 whose gain is defined by its internal register or digital AGC (Automatic Gain Control, automatic gain control) circuit settings. Thereafter, the intermediate frequency signal is input to the first analog to digital converter 15 to be converted into an intermediate frequency digital signal. The intermediate frequency digital signal is then input to digital processing unit 16 for digital processing, wherein digital processing unit 16 includes a first digital filter 161, a sampler 162, a finite impulse response filter 163, and a numerically controlled oscillator 164 for The sampler 162 is provided with a numerically controlled local oscillator signal at the time of sampling, and the first digital filter 161, the sampler 162, and the finite impulse response (FIR) filter 163 sequentially filter and sample the digital signal, and then filter by the finite impulse response. The 163 filters out all out-of-band interference. The digitally processed two orthogonal IF digital signals finally arrive at the digital FM demodulator 17 to demodulate the signaling signal and the speech signal, respectively.
射频发射通路：外界输入的发送语音信号和信令信号经过基带信号处理部分3处理后，首先到达射频发射部分2中的调频深度调节器21进行调频深度调节，然后被送入锁相环频率综合器22，完成数字直接调频调制，产生稳定的调制射频载波信号，调制射频载波信号由功率放大器23放大发射出去。整个射频发射部分2为直接锁相环频率综合形式的发射电路。The radio frequency transmission path: the externally transmitted transmitted speech signal and the signaling signal are processed by the baseband signal processing section 3, and then first reach the FM depth adjuster 21 in the radio frequency transmitting section 2 to perform the FM depth adjustment, and then sent to the phase locked loop frequency synthesis. The device 22 performs digital direct modulation modulation to generate a stable modulated RF carrier signal, and the modulated RF carrier signal is amplified and transmitted by the power amplifier 23. The entire RF transmitting portion 2 is a transmitting circuit of a direct phase-locked loop frequency integrated form.
基带信号处理：基带信号处理部分3主要分为三个单元：接收语音处理单元、发送语音处理单元、信令信号处理单元。其中信令信号处理单元为滤波整形器331，用于对接收（从数字调频解调器17接收）或者发送（由外界输入，将送至调频深度调节器21）的信令信号进行滤波整形处理。接收语音处理单元包括第一语音滤波器311、数模转换器312和语音放大器313。从数字调频解调器17输出的语音信号由第一语音滤波器311、数模转换器312和语音放大器313依次进行滤波、数模转换和放大后输出。发送语音处理单元包括第二模数转换器321、第二数字滤波器322、第二语音滤波器323。由外界输入的发送语音信号首先由第二模数转换器321转换为数字信号、再由第二数字滤波器322滤除带外信号、最后由第二语音滤波器323滤波后输出到射频发射部分2。Baseband signal processing: The baseband signal processing section 3 is mainly divided into three units: a receiving speech processing unit, a transmitting speech processing unit, and a signaling signal processing unit. The signaling signal processing unit is a filter shaper 331 for filtering and shaping the signaling signal received (received from the digital FM demodulator 17) or transmitted (input by the outside, sent to the FM depth adjuster 21). . The received speech processing unit includes a first speech filter 311, a digital to analog converter 312, and a speech amplifier 313. The speech signal output from the digital FM demodulator 17 is sequentially filtered, digital-analog converted, and amplified by the first speech filter 311, the digital-to-analog converter 312, and the speech amplifier 313. The transmit speech processing unit includes a second analog to digital converter 321, a second digital filter 322, and a second speech filter 323. The transmitted speech signal input from the outside is first converted into a digital signal by the second analog-to-digital converter 321, and then filtered out by the second digital filter 322, finally filtered by the second speech filter 323, and output to the radio-frequency transmitting portion. 2.
第二模数转换器321采用高性能的Delta－Sigma模数转换器，采样频率可与整个集成对讲芯片的时钟频率一致，这样的选择可使得前端不需要抗混叠滤波器。锁相环频率综合器22中的压控振荡器（未示出）工作在1.4GHz到2GHz，以避免功率放大器23产生拖曳效应。压控振荡器经分频输出对讲模块所需要的频率范围。同时，锁相环频率综合器22还同时提供给混频器12以本振信号，以避免混频器还需要另外采用其他器件来获取本振信号。锁相环频率综合器22采用高性能的小数锁相环频率综合器，从而实现了低相位噪声、极快的锁相时间及任意频点可调的高性能、低成本设计方式。The second analog-to-digital converter 321 uses a high-performance Delta-Sigma analog-to-digital converter with a sampling frequency that is consistent with the clock frequency of the entire integrated intercom chip. This choice allows the front end to eliminate the need for an anti-aliasing filter. A voltage controlled oscillator (not shown) in the phase locked loop frequency synthesizer 22 operates at 1.4 GHz to 2 GHz to avoid the drag effect of the power amplifier 23. The voltage controlled oscillator is divided to output the frequency range required by the intercom module. At the same time, the phase-locked loop frequency synthesizer 22 also supplies the local oscillator signal to the mixer 12 to avoid that the mixer needs to additionally use other devices to obtain the local oscillator signal. The phase-locked loop frequency synthesizer 22 uses a high-performance fractional-phase-locked loop frequency synthesizer to achieve low-phase noise, extremely fast phase-locking time, and high-performance, low-cost design with adjustable frequency points.
数字接口控制部分4：上述射频接收部分1、射频发射部分2和基带信号处理部分3均可由MCU通过数字接口控制部分4控制，对上述三个部分的工作状态和参数进行调整，包括接收增益、发射调频增益、频率、射频收发控制以及锁相环频率综合器的环路特性等各个参数。数字接口控制部分4采用例如I2C总线作为双向控制总线，实现与MCU的交互与控制。或者也可以通过三线或四线SPI总线作为控制总线，实现与MCU的交互与控制。例如对于I2C总线，按照I2C的格式，MCU产生相应的控制字，寻址数字接口控制部分，确定读/写模式，而后进行数据的读出或写入。MCU可以是DSP内核的处理器，同样的，也可以是其他类型的控制器件。The digital interface control part 4: the radio frequency receiving part 1, the radio frequency transmitting part 2 and the baseband signal processing part 3 can be controlled by the MCU through the digital interface control part 4, and the working states and parameters of the above three parts are adjusted, including the receiving gain, Various parameters such as frequency modulation gain, frequency, RF transceiver control, and loop characteristics of the phase-locked loop frequency synthesizer are transmitted. The digital interface control section 4 employs, for example, an I2C bus as a bidirectional control bus to implement interaction and control with the MCU. Alternatively, the three-wire or four-wire SPI bus can be used as a control bus to realize interaction and control with the MCU. For example, for the I2C bus, in accordance with the I2C format, the MCU generates a corresponding control word, addresses the digital interface control portion, determines the read/write mode, and then reads or writes the data. The MCU can be the processor of the DSP core, and the same can be other types of control devices.
集成对讲芯片的电源管理通过芯片内置低压差线性稳压电路及控制电路，为芯片内的各个功能器件提供稳定的直流电源。The integrated power management of the intercom chip provides a stable DC power supply for each functional device in the chip through the built-in low-dropout linear regulator circuit and control circuit.
图2示出了含有上述集成对讲芯片的一种集成对讲***，该集成对讲***工作时，MCU5主要通过与集成对讲芯片的数字接口控制部分4的连接来完成与对讲处理部分（包括射频接收部分1、射频发射部分2、基带信号处理部分3）的交互。接收时，射频信号依次经过天线开关和滤波器输入到集成对讲芯片，对讲处理部分对射频信号进行前述处理，输出语音信号到扬声器（喇叭），并将信令信号输出到MCU5，MCU5根据信令信号控制语音信号的输出状态：信令信号与MCU5中的预设值进行比较，如果与预置值相同，中央处理部分5控制打开扬声器释放语音信号，若不同，则关闭扬声器，不释放语音信号。发射时，发送语音通过受话器（麦克风）转换成音频电信号，经对讲处理部分处理输出数字调频调制信号后经过功放产生额定的射频功率后经过天线开关由天线发射出去，MCU5同时产生信令信号送入对讲处理部分，由对讲处理部分处理后同语音信号一起发射。FIG. 2 shows an integrated intercom system including the above integrated intercom chip. When the integrated intercom system works, the MCU 5 mainly completes the intercom processing part through the connection with the digital interface control part 4 of the integrated intercom chip. (including the interaction of the radio frequency receiving section 1, the radio frequency transmitting section 2, and the baseband signal processing section 3). When receiving, the radio frequency signal is sequentially input to the integrated intercom chip through the antenna switch and the filter, and the intercom processing part performs the foregoing processing on the radio frequency signal, outputs the speech signal to the speaker (horn), and outputs the signaling signal to the MCU 5, and the MCU 5 according to the The signaling signal controls the output state of the voice signal: the signaling signal is compared with the preset value in the MCU 5. If the preset value is the same, the central processing section 5 controls to turn on the speaker to release the voice signal. If different, the speaker is turned off, and the speaker is not released. voice signal. When transmitting, the transmitted voice is converted into an audio electric signal by the receiver (microphone), and the intermodulation processing part processes and outputs the digital FM modulated signal, and then generates a rated RF power through the power amplifier, and then transmits the antenna through the antenna switch, and the MCU5 simultaneously generates the signaling signal. The incoming intercom processing part is processed by the intercom processing part and transmitted together with the speech signal.
该集成对讲***，包括键盘输入单元以进行例如控制指令输入和显示单元以进行例如显示输出，以方便该集成对讲***的使用。The integrated intercom system includes a keyboard input unit for, for example, a control command input and a display unit to perform, for example, a display output to facilitate use of the integrated intercom system.
如图3所示，本发明实施例的集成对讲***，还可以包括GPS模块，所述GPS模块与集成对讲芯片相连。As shown in FIG. 3, the integrated intercom system of the embodiment of the present invention may further include a GPS module, and the GPS module is connected to the integrated intercom chip.
通过这种设置，可以通过集成对讲芯片，将GPS模块获得的GPS定位信息发送出去，从而在例如救援行动中，将对讲***持有者的位置信息提供给援助人员。With this arrangement, the GPS positioning information obtained by the GPS module can be transmitted by integrating the intercom chip, thereby providing the location information of the intercom system holder to the assistance personnel in, for example, a rescue operation.
本发明的集成对讲芯片及集成对讲***，很好地解决了传统的模拟信号处理技术电路结构分化复杂、分立元器件多、稳定性差等问题。大大简化了产品设计和降低了成本，提高了产品的技术含量和智能化设计。The integrated intercom chip and the integrated intercom system of the invention solve the problems of complicated circuit structure differentiation, multiple discrete components and poor stability of the traditional analog signal processing technology. It greatly simplifies product design and reduces costs, and improves the technical content and intelligent design of the product.
将该集成对讲芯片嵌入到手机等产品中，还可以实现具有对讲功能的手机或其他产品。The integrated intercom chip can be embedded in a mobile phone or the like, and a mobile phone or other product having an intercom function can also be realized.
以上内容是结合具体的优选实施方式对本发明所作的进一步详细说明，不能认定本发明的具体实施只局限于这些说明。对于本发明所属技术领域的普通技术人员来说，在不脱离本发明构思的前提下，还可以做出若干简单推演或替换，都应当视为属于本发明的保护范围。The above is a further detailed description of the present invention in connection with the specific preferred embodiments, and the specific embodiments of the present invention are not limited to the description. It will be apparent to those skilled in the art that the present invention may be made without departing from the spirit and scope of the invention.

Claims (9)

  1. 一种集成对讲芯片，其特征在于，包括中央处理部分、对讲处理部分和数字接口控制部分，所述对讲处理部分用于实现对讲信号收发处理，所述中央处理部分与所述数字接口控制部分相连，所述数字接口控制部分与所述对讲处理部分相连，所述中央处理部分通过所述数字接口控制部分控制所述对讲处理部分的工作状态和参数；所述中央处理部分、对讲处理部分和数字接口控制部分采用数字信号技术并通过CMOS工艺集成在一片芯片上。An integrated intercom chip, comprising: a central processing part, an intercom processing part and a digital interface control part, wherein the intercom processing part is configured to implement intercom signal transceiving processing, the central processing part and the digital The interface control portion is connected, the digital interface control portion is connected to the intercom processing portion, and the central processing portion controls an operation state and a parameter of the intercom processing portion through the digital interface control portion; the central processing portion The intercom processing part and the digital interface control part adopt digital signal technology and are integrated on one chip through a CMOS process.
  2. 如权利要求1所述的集成对讲芯片，其特征在于，所述中央处理部分和对讲处理部分共用一个晶振。The integrated intercom chip of claim 1 wherein said central processing portion and said intercom processing portion share a crystal.
  3. 如权利要求2所述的集成对讲芯片，其特征在于，所述对讲处理部分包含射频接收部分、射频发射部分和基带信号处理部分；所述射频接收部分用于接收射频信号并解调输出语音信号和信令信号到基带信号处理部分；所述基带信号处理部分用于对所述解调输出的语音信号和信令信号进行基带处理后输出，还用于把发送语音信号和信令信号进行基带处理后输出到所述射频发射部分；所述射频发射部分为直接锁相环频率综合形式的发射电路，该电路包括：调频深度调节器、小数锁相环频率综合器和功率放大器，所述调频深度调节器用于对输入的语音信号和信令信号进行调频深度调节；所述小数锁相环频率综合器用于对调频深度调节器调节后输出的信号完成数字直接调频调制，产生射频调制载波信号；所述功率放大器用于对所述射频调制载波信号进行功率放大后输出。 The integrated intercom chip of claim 2, wherein the intercom processing portion comprises a radio frequency receiving portion, a radio frequency transmitting portion and a baseband signal processing portion; the radio frequency receiving portion is configured to receive a radio frequency signal and demodulate the output a voice signal and a signaling signal to the baseband signal processing portion; the baseband signal processing portion is configured to perform baseband processing on the demodulated output voice signal and the signaling signal, and is also used for transmitting the voice signal and the signaling signal Performing baseband processing and outputting to the radio frequency transmitting portion; the radio frequency transmitting portion is a transmitting circuit of a direct phase-locked loop frequency integrated form, the circuit comprising: a frequency modulation depth adjuster, a fractional phase-locked loop frequency synthesizer, and a power amplifier, The FM depth adjuster is configured to perform FM depth adjustment on the input voice signal and the signaling signal; the fractional phase-locked loop frequency synthesizer is configured to perform digital direct modulation modulation on the signal outputted by the FM depth adjuster to generate a radio frequency modulated carrier. a signal; the power amplifier is configured to perform power on the radio frequency modulated carrier signal Zoom in and output.
  4. 如权利要求3所述的集成对讲芯片，其特征在于，所述射频接收部分为低中频形式的接收电路。The integrated intercom chip of claim 3 wherein said radio frequency receiving portion is a receiving circuit in the form of a low intermediate frequency.
  5. 如权利要求4所述的集成对讲芯片，其特征在于，所述低中频形式的接收电路包括：低噪声放大器、正交混频器、两路中频信号处理单元、数字调频解调器；所述低噪声放大器用于对接收的射频信号进行低噪声放大并分两路输出到所述正交混频器；所述正交混频器用于混频变换出两路正交中频信号分别输出到两路中频信号处理单元；所述两路中频信号处理单元分别对输入的中频信号进行处理，输出中频数字信号；所述数字调频解调器用于对输入的两路中频数字信号进行解调，分别输出语音信号和信令信号。 The integrated intercom chip of claim 4, wherein the receiving circuit in the low intermediate frequency form comprises: a low noise amplifier, a quadrature mixer, two intermediate frequency signal processing units, and a digital FM demodulator; The low noise amplifier is configured to perform low noise amplification on the received RF signal and output the signal to the quadrature mixer in two ways; the quadrature mixer is used for mixing and transforming two orthogonal IF signals to output to Two intermediate frequency signal processing units; the two intermediate frequency signal processing units respectively process the input intermediate frequency signals and output intermediate frequency digital signals; the digital frequency modulation demodulator is configured to demodulate the input two intermediate frequency digital signals, respectively The voice signal and the signaling signal are output.
  6. 如权利要求3所述的集成对讲芯片，其特征在于，所述基带信号处理部分包括接收语音处理单元、发送语音处理单元、信令信号处理单元；所述信令信号处理单元用于对接收或发送的信令信号进行滤波整形处理；所述接收语音处理单元用于对所述射频接收部分输出的语音信号进行数模转换和滤波放大处理后输出；所述发送语音处理单元用于对外界输入的发送语音信号依次进行滤波、数模转换和放大后输出到射频发射部分。The integrated intercom chip of claim 3, wherein the baseband signal processing portion comprises a receiving speech processing unit, a transmitting speech processing unit, and a signaling signal processing unit; and the signaling signal processing unit is configured to receive Or the sent signaling signal is used for filtering and shaping processing; the receiving voice processing unit is configured to perform digital-to-analog conversion and filtering and amplifying processing on the voice signal outputted by the radio frequency receiving portion; and the transmitting voice processing unit is used to The input transmitted voice signal is sequentially filtered, digital-to-analog converted, and amplified, and output to the RF transmitting portion.
  7. 如权利要求1-6任一所述的集成对讲芯片，其特征在于，所述中央处理部分为DSP内核。The integrated intercom chip of any of claims 1-6, wherein the central processing portion is a DSP core.
  8. 一种集成对讲***，其特征在于，包括如权利要求1-7任一所述的集成对讲芯片。An integrated intercom system, comprising the integrated intercom chip of any of claims 1-7.
  9. 如权利要求8所述的集成对讲***，其特征在于，还包括GPS模块，所述GPS模块与所述集成对讲芯片相连。The integrated intercom system of claim 8 further comprising a GPS module, said GPS module being coupled to said integrated intercom chip.
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