WO2009026836A1 - Système de discussion en conférence infrarouge numérique, son hôte utilisant ledit système et unité de discussion - Google Patents

Système de discussion en conférence infrarouge numérique, son hôte utilisant ledit système et unité de discussion Download PDF

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Publication number
WO2009026836A1
WO2009026836A1 PCT/CN2008/072086 CN2008072086W WO2009026836A1 WO 2009026836 A1 WO2009026836 A1 WO 2009026836A1 CN 2008072086 W CN2008072086 W CN 2008072086W WO 2009026836 A1 WO2009026836 A1 WO 2009026836A1
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Prior art keywords
circuit
digital
infrared
infrared conference
audio
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PCT/CN2008/072086
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English (en)
French (fr)
Inventor
Zhishuo Zhang
Original Assignee
Shenzhen Taiden Industrial Co., Ltd.
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Publication date
Application filed by Shenzhen Taiden Industrial Co., Ltd. filed Critical Shenzhen Taiden Industrial Co., Ltd.
Priority to DE212008000014U priority Critical patent/DE212008000014U1/de
Publication of WO2009026836A1 publication Critical patent/WO2009026836A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/11—Arrangements specific to free-space transmission, i.e. transmission through air or vacuum
    • H04B10/114—Indoor or close-range type systems
    • H04B10/1149—Arrangements for indoor wireless networking of information

Definitions

  • the present invention relates to a digital infrared conference discussion system and its host and discussion unit.
  • the current infrared conference discussion system consists of an infrared conference system host, an infrared transceiver and an infrared conference discussion unit, which can realize conference presentation, electronic voting and other functions.
  • the international infrared conference discussion system uses analog audio transmission, and the audio performance is poor. Its working principle is this:
  • the infrared conference discussion unit FM-modulates the analog audio signal acquired by the pickup, and transmits it to the infrared light signal.
  • the conference system host receives the infrared signal through the infrared receiver tube and converts it into an electrical signal, which is amplified and solved. After adjustment, send the sound reinforcement system. After speaking, the conference system host receives multiple audio signals, demodulates and mixes them, and finally sends the sound reinforcement.
  • the audio signal in the infrared conference discussion system is transmitted in analog mode, and the audio performance is poor.
  • the frequency response is generally 100Hz ⁇ 4kHz (equivalent to the sound quality level of ordinary telephone), the sound effect is not clear enough, and the human ear can The perceived audio frequency response is 20Hz ⁇ 20kHz.
  • the purpose of the present invention is to solve the problem that the audio signal in the current infrared conference discussion system is transmitted in an analog manner, and the audio performance is poor, and the frequency response is generally 100 Hz to 4 kHz (equivalent to the sound quality level of an ordinary telephone), and the sound effect is insufficient. Clear question,
  • An infrared transceiver and an infrared conference discussion unit wherein the infrared conference discussion unit has an A/D conversion circuit, a digital coding circuit and a digital modulation circuit, and the digital coding circuit and the digital modulation circuit are sequentially connected to the A/ After the D conversion circuit;
  • the digital conference system has a digital demodulation circuit, a digital decoding circuit, and a D/A conversion circuit.
  • the digital decoding circuit is connected to the digital demodulation circuit, and a mixing circuit is connected to the digital decoding circuit. Between the circuit and the D/A conversion circuit or connected to the D/A conversion circuit Rear.
  • Another object of embodiments of the present invention is to provide an infrared conference discussion unit, which includes an A/D conversion circuit, a digital coding circuit, and a digital modulation circuit, and the digital coding circuit and digital modulation The circuit is sequentially connected to the A/D conversion circuit.
  • Another object of the embodiments of the present invention is to provide an infrared conference system host, where the infrared conference system host includes a digital demodulation circuit, a digital decoding circuit, and a D/A conversion circuit, and the digital decoding circuit is connected to the digital demodulation circuit. After the circuit, a mixing circuit is connected between the digital decoding circuit and the D/A conversion circuit or connected to the D/A conversion circuit.
  • FIG. 1 is a block diagram of a digital conference discussion system of the first to sixth embodiments of the present invention.
  • FIG. 2 is a schematic block diagram of an infrared conference discussion unit according to first and second embodiments of the present invention
  • Figure 3 is a block diagram showing the principle of the infrared transceiver of the first to fourth embodiments of the present invention.
  • FIG. 4 is a schematic block diagram of a host of an infrared conference system according to a first embodiment of the present invention
  • FIG. 5 is a schematic block diagram of a host of an infrared conference system according to a second embodiment of the present invention.
  • FIG. 6 is a schematic block diagram of an infrared conference discussion unit according to third and fourth embodiments of the present invention.
  • FIG. 7 is a schematic block diagram of a host of an infrared conference system according to a third embodiment of the present invention.
  • FIG. 8 is a schematic block diagram of a host of an infrared conference system according to a fourth embodiment of the present invention.
  • FIG. 9 is a schematic block diagram of an infrared conference discussion unit according to fifth and sixth embodiments of the present invention.
  • FIG. 10 is a schematic block diagram of an infrared transceiver according to fifth and sixth embodiments of the present invention.
  • FIG. 11 is a schematic block diagram of a host of an infrared conference system according to a fifth embodiment of the present invention.
  • FIG. 12 is a schematic block diagram of a host of an infrared conference system according to a sixth embodiment of the present invention.
  • FIG. 13 is a flow chart of a host control program of an infrared conference system according to first, second, third and fourth embodiments of the present invention.
  • Figure 14 is a flow chart showing the control procedure of the infrared conference discussion unit of the first, second, third and fourth embodiments of the present invention.
  • Figures 1, 2, 3, 4, 13, and 14 show a first embodiment of the present invention.
  • the digital conference discussion system includes an infrared conference system host, an infrared transceiver, and an infrared conference discussion unit, and an A/D (analog/digital) conversion circuit is built in the infrared conference discussion unit.
  • digital conference discussion system will be an infrared conference discussion unit
  • the analog audio signal obtained by the microphone pickup is amplified, converted into a digital audio signal by A/D (analog/digital), and digitally encoded, QPSK modulated, and filtered together with the control signal of the infrared conference discussion unit, and then passed through the infrared transmitting tube.
  • Infrared light is emitted; the infrared transceiver receives signals from the infrared conference discussion unit through the infrared receiving tube, and Converted into an electrical signal, after amplification and filtering, the signal is transmitted to the infrared conference system host; the infrared conference system host receives the digital signal from the infrared conference discussion unit through the infrared transceiver, and is amplified and frequency-converted (by the filter circuit and the mixing frequency Circuit composition), frequency selection network (bandpass filter) After frequency selection, automatic gain amplification is performed, QPSK demodulation, digital decoding, digital audio signal and control signal are separated, and the same frequency is received.
  • the digital audio signal of the infrared conference discussion unit (up to 6 channels) is mixed, then converted into analog audio signal by D/A (digital/analog), sent to the venue sound reinforcement system, and the received control signal is sent.
  • the control program of the infrared conference system host performs processing; the infrared conference system host digitally encodes the digital audio signal from the infrared conference discussion unit together with the control signal of the infrared conference system host, and performs QPSK modulation, filtering, and amplification.
  • infrared transceiver After sending infrared transceiver, infrared transceiver
  • the digital signal from the host of the infrared conference system is filtered, amplified, and broadcasted in the form of infrared light through the infrared transmitting tube; each infrared conference discussion unit receives the digital signal from the host of the infrared conference system through the infrared receiving tube, After amplification, filtering, and automatic gain amplification, QPSK demodulation and digital decoding are performed, digital audio signals and control signals are separated, and digital audio signals are converted into analog audio signals by D/A (digital/analog).
  • the playback unit (speaker or earphone) of the conference discussion unit listens, and sends the received control signal to the control program of the infrared conference discussion unit for processing.
  • the infrared conference system host connects a plurality of infrared transceivers in a star or hand-in-hand manner.
  • the infrared conference discussion unit includes a microphone, a microphone switch button, and a speaker, a battery, and the like.
  • the infrared conference discussion unit receives the audio signal and the control signal broadcasted by the infrared conference system host in the form of infrared light, and sends the control signal to the infrared conference system host in the form of infrared light, the microphone is turned on, and the infrared conference discussion unit is in the form of infrared light.
  • each digital audio signal and control information occupies a load wave frequency point (a transmission path). Since there may be a large number of infrared conference discussion units sending control information to the infrared conference system host (such as many microphones requesting to speak or electronic voting), in order to improve the "upstream" from the infrared conference discussion unit to the infrared conference system host "To control the speed of information transmission, the above "uplink" control information can be transmitted using independent load wave frequency points (ie, using separate transmission paths).
  • Figures 1, 2, 3, 5, 13, and 14 show a second embodiment of the present invention.
  • the digital conference discussion system includes an infrared conference system host, an infrared transceiver and an infrared conference discussion unit, and an A/D (analog/digital) conversion circuit is built in the infrared conference discussion unit.
  • digital conference discussion system will simulate the acquisition of the infrared conference discussion unit microphone pickup Audio signal is amplified, converted by A/D (analog/digital) The digital audio signal is digitally encoded, DQPS K modulated, and filtered together with the control signal of the infrared conference discussion unit, and then transmitted through the infrared transmitting tube in the form of infrared light; the infrared transceiver receives the infrared conference discussion unit through the infrared receiving tube.
  • the signal is converted into an electrical signal, and after being amplified and filtered, the signal is transmitted to the infrared conference system host; the infrared conference system host receives the digital signal from the infrared conference discussion unit through the infrared transceiver, and is amplified and frequency-converted ( It consists of a filter circuit and a mixing circuit), a frequency selective network (bandpass filter), after frequency selection, automatic gain amplification is performed, and D is performed.
  • the D/A Digital/Analog
  • the D/A Digital/Analog
  • the audio signals up to 6 channels
  • the audio signals up to 6 channels
  • the audio signals received from the multi-channel infrared conference discussion unit are mixed and sent to the venue sound reinforcement system, Receiving the received control signal to the control program of the infrared conference system host for processing; the infrared conference system host will convert the analog audio signal from the infrared conference discussion unit to A/D (analog/digital to digital audio)
  • the signal is digitally encoded and D QPSK modulated together with the control signal of the infrared conference system host.
  • the infrared transceiver After filtering and amplifying, the infrared transceiver is sent, and the infrared transceiver transmits the digital signal from the infrared conference system host through filtering and amplification.
  • the infrared transmitting tube is broadcasted in the form of infrared light; each infrared conference discussion unit receives the digital signal from the infrared conference system host through the infrared receiving tube, and performs DQPSK demodulation, digital decoding, and separation after amplification, filtering, and automatic gain amplification.
  • Digital audio signal and control signal and then digital audio signal
  • the D/A Digital/Analog
  • the D/A Digital/Analog
  • the delegates listen through the playback device (speaker or earphone) of the infrared conference discussion unit, and send the received control signal to the control program of the infrared conference discussion unit. deal with.
  • the infrared conference system host connects a plurality of infrared transceivers in a star or hand-in-hand manner.
  • the infrared conference discussion unit includes a microphone, a microphone switch button, and a speaker, a battery, and the like.
  • the infrared conference discussion unit receives the audio signal and the control signal broadcasted by the infrared conference system host in the form of infrared light, and sends the control signal to the infrared conference system host in the form of infrared light, the microphone is turned on, and the infrared conference discussion unit is in the form of infrared light.
  • Figures 1, 3, 6, 7, 13, and 14 show a third embodiment of the present invention.
  • the digital conference discussion system includes an infrared conference system host, an infrared transceiver and an infrared conference discussion unit, and an A/D (analog/digital) conversion circuit is built in the infrared conference discussion unit.
  • digital coding circuit, QPSK modulator, decoding circuit, QPSK demodulator; QPSK demodulator, digital decoding circuit, D/A (digital/analog) conversion circuit, coding circuit, QPSK are built in the infrared conference system host a modulator, a mixing circuit connected between the digital decoding circuit and the D/A (digital/analog) conversion circuit;
  • the digital conference discussion system amplifies the analog audio signal obtained by the infrared conference discussion unit microphone pickup, via A/ D (analog/digital) is converted into a digital audio signal and digitally encoded, QPSK modulated, filtered together with the control signal of the infrared conference discussion unit, and then transmitted as infrared light through the infrared transmitting tube;
  • the infrared transceiver passes through the infrared receiving tube Receive signals from the infrared conference discussion unit and convert them into electrical signals After filtering, the signal is transmitted to the infrared conference system host; the infrared conference
  • the infrared conference system host connects a plurality of infrared transceivers in a star or hand-in-hand manner.
  • the infrared conference discussion unit includes a microphone, a microphone switch button, a battery and the like.
  • the infrared conference discussion unit receives the control signal broadcasted by the infrared conference system host in the form of infrared light, and sends the control signal to the infrared conference system host in the form of infrared light, the microphone is turned on, and the infrared conference discussion unit is in the infrared light form to the infrared conference.
  • the system host sends a digital audio signal. Any number of infrared conference discussion units can be used throughout the system, but only up to 4 to 6 infrared conference discussion units can be turned on at the same time.
  • each digital audio signal and control information occupies a load wave frequency point (a transmission path). Since there may be a large number of infrared conference discussion units sending control information to the infrared conference system host (such as many microphones requesting to speak or electronic voting), in order to improve the "upstream" from the infrared conference discussion unit to the infrared conference system host "To control the speed of information transmission, the above "uplink" control information can be transmitted using independent load wave frequency points (ie, using separate transmission paths).
  • Fig. 1, Fig. 3, Fig. 6, Fig. 8, Fig. 13, and Fig. 14 show a fourth embodiment of the present invention.
  • the digital conference discussion system includes an infrared conference system host, an infrared transceiver, and an infrared conference discussion unit, and an A/D (analog/digital) conversion circuit is built in the infrared conference discussion unit.
  • digital conference discussion system will simulate the analog audio signal obtained by the infrared conference discussion unit microphone pickup Amplify, convert to digital audio signal by A/D (analog/digital), and digitally encode, DQPSK, and filter together with the control signal of the infrared conference discussion unit, and then emit it as infrared light through the infrared emission tube;
  • the transceiver receives the signal from the infrared conference discussion unit through the infrared receiving tube and converts it into an electrical signal.
  • the signal is transmitted to the infrared conference system host; the infrared conference system host receives the digital signal from the infrared conference discussion unit through the infrared transceiver, and is amplified, frequency-converted (composed of the filter circuit and the mixer circuit), and frequency-selected.
  • the infrared transceiver transmits the digital signal from the host of the infrared conference system, after filtering and amplification, and broadcasts in the form of infrared light through the infrared transmitting tube;
  • the unit receives the digital signal from the infrared conference system host through the infrared receiving tube, and after amplification, filtering, automatic gain amplification, performs DQPSK demodulation, digital decoding, obtains a control signal, and sends the received control signal to the infrared conference discussion unit.
  • the control program processes it.
  • the infrared conference system host connects a plurality of infrared transceivers in a star or hand-in-hand manner.
  • the infrared conference discussion unit includes a microphone, a microphone switch button, a battery, and the like.
  • the infrared conference discussion unit receives the control signal broadcasted by the infrared conference system host in the form of infrared light, and sends the control signal to the infrared conference system host in the form of infrared light, the microphone is turned on, and the infrared conference discussion unit is in the infrared light form to the infrared conference.
  • the system host sends a digital audio signal.
  • the entire system can use any number of infrared conference discussion units, but only up to 4 to 6 infrared conference discussion units can be turned on at the same time.
  • each digital audio signal and control information occupies a load wave frequency point (a transmission path). Since there may be a large number of infrared conference discussion units sending control information to the infrared conference system host (such as many microphones requesting to speak or electronic voting), in order to improve the "upstream" from the infrared conference discussion unit to the infrared conference system host "To control the speed of information transmission, the above "uplink" control information can be transmitted using independent load wave frequency points (ie, using separate transmission paths).
  • Figures 1, 9, 10, and 11 show a fifth embodiment of the present invention.
  • the digital conference discussion system includes an infrared conference system host, an infrared transceiver, and an infrared conference discussion unit, and an A/D (analog/digital) conversion circuit is built in the infrared conference discussion unit.
  • digital coding circuit, DQPSK modulator; D9PSK demodulator, digital decoding circuit and D/A (digital/analog) conversion circuit are built in the infrared conference system host, and a mixing circuit is connected to the digital decoding circuit and D/ A (digital/analog) conversion circuit;
  • the digital discussion system amplifies the analog audio signal acquired by the infrared conference discussion unit microphone pickup and performs A/D (analog/digital) conversion
  • the digital audio signal is digitally encoded, DQPSK modulated, filtered, and transmitted through the infrared transmitting tube in the form of infrared light; the infrared transceiver receives the signal from the infrared conference discussion unit through the infrared receiving tube, and converts the signal into an electrical signal.
  • the signal After being amplified and filtered, the signal is transmitted to the infrared conference system host; the infrared conference system host receives the digital signal from the infrared conference discussion unit through the infrared transceiver, and is amplified, frequency-converted (composed of the filter circuit and the mixer circuit), and selected Frequency network (bandpass filter) After frequency selection, automatic gain amplification is performed, DQPSK demodulation and digital decoding are performed to obtain digital audio signals, and the digital audio signals from the multi-channel infrared conference discussion unit are received simultaneously. (Up to 6 channels) Mixing, then converting to analog audio signal by D/A (digital/analog), sending the venue sound reinforcement system
  • the infrared conference system host connects a plurality of infrared transceivers in a star or hand-in-hand manner.
  • the infrared conference discussion unit includes a microphone, a microphone switch button, a battery and the like. After the microphone is turned on, the infrared conference discussion unit sends the digital audio signal to the infrared conference system host in the form of infrared light. Any number of infrared conference discussion units can be used throughout the system, but only up to 4 to 6 infrared conference discussion units can be turned on at the same time.
  • Figures 1, 9, 10, and 12 show a sixth embodiment of the present invention.
  • the digital conference discussion system includes an infrared conference system host, an infrared transceiver, and an infrared conference discussion unit, and an A/D (analog/digital) conversion circuit is built in the infrared conference discussion unit.
  • digital coding circuit, QPSK modulation circuit; QPSK demodulation circuit, digital decoding circuit and D/A (digital/analog) conversion circuit are built in the infrared conference system host, and a mixing circuit is connected to D/A (digital/ After the conversion circuit;
  • the digital discussion system amplifies the analog audio signal obtained by the infrared conference discussion unit microphone pickup, and converts it into a digital audio signal by A/D (analog/digital), digital coding, QPSK modulation, After filtering, it is emitted as infrared light through the infrared transmitting tube;
  • the infrared transceiver receives the signal from the infrared conference discussion unit through the infrared receiving tube, and converts it into an electrical signal, and after amplification and filtering, transmits the signal to the infrared Conference system host;
  • infrared conference system host receives infrared conference discussion through infrared transceiver The digital signal of the element is amplified
  • the infrared conference system host connects a plurality of infrared transceivers in a star or hand-in-hand manner.
  • the infrared conference discussion unit includes a microphone, a microphone switch button, a battery and the like. After the microphone is turned on, the infrared conference discussion unit sends the digital audio signal to the infrared conference system host in the form of infrared light. Any number of infrared conference discussion units can be used throughout the system, but only up to 4 to 6 infrared conference discussion units can be turned on at the same time.
  • Figure 13 is a flow chart showing the host control program of the infrared conference system cited in the first, second, third and fourth embodiments of the present invention.
  • control procedure includes the following steps:
  • [58] (1) determining whether the conference unit speech application command is received from the uplink channel (step 201);
  • step 201 If the result of the determination in step 201 is no, the process returns to step 201 (step 202);
  • step 2 01 If the result of the determination in step 2 01 is YES, it is determined whether there is an idle uplink channel (step 2 03);
  • step 203 If the result of the determination in step 203 is no, the process returns to step 201 (step 204);
  • step 203 If the result of the determination in step 203 is YES, the application for the conference unit is allocated an uplink channel, and the control signal is sent to the conference unit through the downlink signal channel (step 205);
  • Figure 14 is a flow chart showing the control procedure of the infrared conference discussion unit cited in the first, second, third and fourth embodiments of the present invention.
  • control procedure includes the following steps:
  • step 101 If the result of the determination in step 101 is no, the process returns to step 101 (step 102);
  • step 101 If the result of the determination in step 101 is YES, it is determined whether there is an idle uplink channel from the control data of the downlink signal (step 103);
  • step 104 If the result of the determination in step 103 is no, the process returns to step 101 (step 104);
  • step 105 If the result of the determination in step 103 is YES, the "speak request" command is sent from the idle uplink channel (step 105);
  • step 106 Determining whether a command for the host to agree to speak is found from the control data of the downlink signal within 10 ms (step 106) [72] (7) If the result of the determination in step 106 is no, then return to step 101 (step 107);
  • step 106 If the result of the determination in step 106 is YES, the use of the uplink carrier number specified by the host is started, and the audio and control signals are sent (step 108);

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Description

数字红外会议讨论系统及其主机和讨论单元 技术领域
[1] 本发明涉及一种数字红外会议讨论系统及其主机和讨论单元。
背景技术
[2] 目前的红外会议讨论系统由红外会议系统主机、 红外收发器和红外会议讨论单 元组成， 可以实现会议发言讨论、 电子表决等功能。 目前国际上的红外会议讨 论系统均釆用模拟方式的音频传输， 音频性能较差。 其工作原理是这样的：
[3] 代表发言吋， 红外会议讨论单元将拾音器获取的模拟音频信号经 FM调制后， 以红外光信号发射出去， 会议系统主机通过红外接收管接收红外信号并转换成 电信号， 经放大、 解调后， 送扩声系统。 多个代表发言吋， 会议系统主机同吋 接收到多路音频信号， 解调后进行混音， 最后送扩声。
[4] 目前的红外会议讨论系统中的音频信号以模拟方式进行传输， 音频性能差， 其 频率响应一般为 100Hz~4kHz (相当于普通电话的音质水平） ， 声音效果不够清 晰， 而人耳能感知的音频频率响应为 20Hz~20kHz。
对发明的公开
技术问题
[5] 本发明的目的是解决目前的红外会议讨论系统中的音频信号以模拟方式进行传 输， 音频性能差， 其频率响应一般为 100Hz~4kHz (相当于普通电话的音质水平 ) ， 声音效果不够清晰的问题，
技术解决方案
[6] 本发明实施例是这样实现的， 一种数字会议讨论系统， 包括红外会议系统主机
、 红外收发器和红外会议讨论单元， 所述红外会议讨论单元中内置有 A/D转换电 路、 数字编码电路和数字调制电路， 且所述数字编码电路和数字调制电路依次 连接于所述 A/D转换电路之后； 所述红外会议系统主机中内置有数字解调电路、 数字解码电路和 D/A转换电路， 数字解码电路连接于数字解调电路之后， 一混音 电路连接于所述数字解码电路和 D/A转换电路之间或连接于所述 D/A转换电路之 后。
[7] 本发明实施例的另一目的在于提供一种红外会议讨论单元， 所述红外会议讨论 单元包括 A/D转换电路、 数字编码电路和数字调制电路， 且所述数字编码电路和 数字调制电路依次连接于所述 A/D转换电路之后。
[8] 本发明实施例的另一目的在于提供一种红外会议系统主机， 所述红外会议系统 主机包括数字解调电路、 数字解码电路和 D/A转换电路， 数字解码电路连接于数 字解调电路之后， 一混音电路连接于所述数字解码电路和 D/A转换电路之间或连 接于所述 D/A转换电路之后。
有益效果
[9] 本发明相比现有技术具有如下优点：
[10] 1、 釆用数字音频传输的红外会议讨论系统的音频频率响应可达到 20Hz~
20kHz, 信噪比 80dB以上， 音频品质达到 CD级音质。
[11] 2、 釆用数字音频传输的红外会议讨论系统具有较强的抗干扰能力， 使得输出 信号清晰、 稳定。
附图说明
[12] 图 1是本发明第一至第六实施例数字会议讨论系统的方框图；
[13] 图 2是本发明第一、 第二实施例红外会议讨论单元的原理框图；
[14] 图 3是本发明第一至第四实施例红外收发器的原理框图；
[15] 图 4是本发明第一实施例红外会议系统主机的原理框图；
[16] 图 5是本发明第二实施例红外会议系统主机的原理框图；
[17] 图 6是本发明第三、 第四实施例红外会议讨论单元的原理框图；
[18] 图 7是本发明第三实施例红外会议系统主机的原理框图；
[19] 图 8是本发明第四实施例红外会议系统主机的原理框图；
[20] 图 9是本发明第五、 第六实施例红外会议讨论单元的原理框图；
[21] 图 10是本发明第五、 第六实施例红外收发器的原理框图；
[22] 图 11是本发明第五实施例红外会议系统主机的原理框图；
[23] 图 12是本发明第六实施例红外会议系统主机的原理框图；
[24] 图 13是本发明第一、 二、 三、 四实施例的红外会议系统主机控制程序的流程框 图； 以及
[25] 图 14是本发明第一、 二、 三、 四实施例的红外会议讨论单元控制程序的流程框 图。
本发明的最佳实施方式
[26] 为了使本发明的目的、 技术方案及优点更加清楚明白， 以下结合附图及实施例 ， 对本发明进行进一步详细说明。 应当理解， 此处所描述的具体实施例仅仅用 以解释本发明， 并不用于限定本发明。
[27] 本发明下面将结合附图作进一步详述：
[28] 图 1、 图 2、 图 3、 图 4、 图 13、 图 14示出了本发明的第一个实施例。
[29] 请参阅附图所示， 该数字会议讨论系统， 包括红外会议系统主机、 红外收发器 和红外会议讨论单元， 所述红外会议讨论单元中内置有 A/D (模拟 /数字） 转换 电路、 数字编码电路、 QPSK调制器、 D/A (数字 /模拟） 转换电路、 数字解码电 路、 QPSK解调器； 所述红外会议系统主机中内置有 QPSK解调器、 数字解码电 路、 D/A (数字 /模拟） 转换电路、 数字编码电路、 QPSK调制器， 一混音电路接 于数字解码电路与 D/A (数字 /模拟） 转换电路之间； 所述数字会议讨论系统将 红外会议讨论单元话筒拾音器获取的模拟音频信号进行放大， 经 A/D (模拟 /数 字） 转换成数字音频信号， 并与红外会议讨论单元的控制信号一起进行数字编 码、 QPSK调制、 滤波后， 通过红外发射管以红外光形式发射出去； 红外收发器 通过红外接收管接收来自红外会议讨论单元的信号， 并将之转换成电信号， 经 过放大、 滤波后， 将信号传送到红外会议系统主机； 红外会议系统主机通过红 外收发器接收到来自红外会议讨论单元的数字信号， 经放大、 变频 （由滤波电 路和混频电路组成） 、 选频网络 （带通滤波器） 选频后， 进行自动增益放大， 将之进行 QPSK解调、 数字解码， 分离出数字音频信号和控制信号， 并将同吋接 收到的来自多路红外会议讨论单元的数字音频信号 （最多 6路） 进行混音， 再通 过 D/A (数字 /模拟） 转换成模拟音频信号， 送会场扩声系统， 同吋， 将接收到 的控制信号送红外会议系统主机的控制程序进行处理； 所述红外会议系统主机 将来自红外会议讨论单元经混音后的数字音频信号与红外会议系统主机的控制 信号一起进行数字编码、 QPSK调制， 经滤波、 放大后送红外收发器， 红外收发 器将来自红外会议系统主机的数字信号， 经滤波、 放大后， 通过红外发射管以 红外光的形式进行广播； 各红外会议讨论单元通过红外接收管接收到来自红外 会议系统主机的数字信号， 经放大、 滤波、 自动增益放大后， 进行 QPSK解调、 数字解码， 分离出数字音频信号和控制信号， 再将数字音频信号经 D/A (数字 / 模拟） 转换成模拟音频信号， 与会代表通过红外会议讨论单元的放音装置 （扬 声器或耳机） 收听， 同吋， 将接收到的控制信号送红外会议讨论单元的控制程 序进行处理。
[30] 所述红外会议系统主机以星型或手拉手方式连接多个红外收发器。
[31] 所述红外会议讨论单元包括一个麦克风， 一个话筒开关按键， 及扬声器， 电池 等部件。 红外会议讨论单元接收来自红外会议系统主机以红外光形式广播的音 频信号和控制信号， 并以红外光形式向红外会议系统主机发送控制信号， 话筒 打开吋， 红外会议讨论单元同吋以红外光形式向红外会议系统主机发送数字音 频信号。 整个系统可以使用任意数量的红外会议讨论单元， 但是在同一吋刻最 多只有 4~6支红外会议讨论单元的话筒能打开。
[32] 在上述数字音频信号和控制信息的编码、 QPSK调制过程中， 每一路数字音频 信号和控制信息的传输占用一个负载波频点 （一个传输通路） 。 由于可能有大 量的红外会议讨论单元同吋向红外会议系统主机发送控制信息 (比如很多话筒同 吋要求发言， 或进行电子表决吋)， 为提高从红外会议讨论单元到红外会议系统 主机的 "上行 "控制信息传输的速度， 可以将上述"上行"控制信息釆用独立的负载 波频点 （即釆用独立的传输通路） 进行传输。
[33] 图 1、 图 2、 图 3、 图 5、 图 13、 图 14示出了本发明的第二个实施例。
[34] 请参阅附图所示， 该数字会议讨论系统， 包括红外会议系统主机、 红外收发器 和红外会议讨论单元， 所述红外会议讨论单元中内置有 A/D (模拟 /数字） 转换 电路、 数字编码电路、 DQPSK调制器、 D/A (数字 /模拟） 转换电路、 数字解码 电路、 DQPSK解调器； 所述红外会议系统主机中内置有 DQPSK解调器、 数字解 码电路、 D/A (数字 /模拟） 转换电路、 数字编码电路、 DQPSK调制器， 一混音 电路接于 D/A (数字 /模拟） 转换电路之后； 所述数字会议讨论系统将红外会议 讨论单元话筒拾音器获取的模拟音频信号进行放大， 经 A/D (模拟 /数字） 转换 成数字音频信号， 并与红外会议讨论单元的控制信号一起进行数字编码、 DQPS K调制、 滤波后， 通过红外发射管以红外光形式发射出去； 红外收发器通过红外 接收管接收来自红外会议讨论单元的信号， 并将之转换成电信号， 经过放大、 滤波后， 将信号传送到红外会议系统主机； 红外会议系统主机通过红外收发器 接收到来自红外会议讨论单元的数字信号， 经放大、 变频 （由滤波电路和混频 电路组成） 、 选频网络 （带通滤波器） 选频后， 进行自动增益放大， 将之进行 D
QPSK解调、 数字解码， 分离出数字音频信号和控制信号， 将数字音频信号通过
D/A (数字 /模拟） 转换成模拟音频信号， 并将同吋接收到的来自多路红外会议 讨论单元的音频信号 （最多 6路） 进行混音后， 送会场扩声系统， 同吋， 将接收 到的控制信号送红外会议系统主机的控制程序进行处理； 所述红外会议系统主 机将来自红外会议讨论单元经混音后的模拟音频信号， 通过 A/D (模拟 /数字 转换成数字音频信号， 并与红外会议系统主机的控制信号一起进行数字编码、 D QPSK调制， 经滤波、 放大后送红外收发器， 红外收发器将来自红外会议系统主 机的数字信号， 经滤波、 放大后， 通过红外发射管以红外光的形式进行广播； 各红外会议讨论单元通过红外接收管接收到来自红外会议系统主机的数字信号 ， 经放大、 滤波、 自动增益放大后， 进行 DQPSK解调、 数字解码， 分离出数字 音频信号和控制信号， 再将数字音频信号经 D/A (数字 /模拟） 转换成模拟音频 信号， 与会代表通过红外会议讨论单元的放音装置 （扬声器或耳机） 收听， 同 吋， 将接收到的控制信号送红外会议讨论单元的控制程序进行处理。
[35] 所述红外会议系统主机以星型或手拉手方式连接多个红外收发器。
[36] 所述红外会议讨论单元包括一个麦克风， 一个话筒开关按键， 及扬声器， 电池 等部件。 红外会议讨论单元接收来自红外会议系统主机以红外光形式广播的音 频信号和控制信号， 并以红外光形式向红外会议系统主机发送控制信号， 话筒 打开吋， 红外会议讨论单元同吋以红外光形式向红外会议系统主机发送数字音 频信号。 整个系统可以使用任意数量的红外会议讨论单元， 但是在同一吋刻最 多只有 4~6支红外会议讨论单元的话筒能打开。
[37] 在上述数字音频信号和控制信息的编码、 DQPSK调制过程中， 每一路数字音 频信号和控制信息的传输占用一个负载波频点 （一个传输通路） 。 由于可能有 大量的红外会议讨论单元同吋向红外会议系统主机发送控制信息 (比如很多话筒 同吋要求发言， 或进行电子表决吋)， 为提高从红外会议讨论单元到红外会议系 统主机的"上行"控制信息传输的速度， 可以将上述"上行"控制信息釆用独立的负 载波频点 （即釆用独立的传输通路） 进行传输。
[38] 图 1、 图 3、 图 6、 图 7、 图 13、 图 14示出了本发明的第三个实施例。
[39] 请参阅附图所示， 该数字会议讨论系统， 包括红外会议系统主机、 红外收发器 和红外会议讨论单元， 所述红外会议讨论单元中内置有 A/D (模拟 /数字） 转换 电路、 数字编码电路、 QPSK调制器、 解码电路、 QPSK解调器； 所述红外会议 系统主机中内置有 QPSK解调器、 数字解码电路、 D/A (数字 /模拟） 转换电路、 编码电路、 QPSK调制器， 一混音电路接于数字解码电路与 D/A (数字 /模拟） 转 换电路之间； 所述数字会议讨论系统将红外会议讨论单元话筒拾音器获取的模 拟音频信号进行放大， 经 A/D (模拟 /数字） 转换成数字音频信号， 并与红外会 议讨论单元的控制信号一起进行数字编码、 QPSK调制、 滤波后， 通过红外发射 管以红外光形式发射出去； 红外收发器通过红外接收管接收来自红外会议讨论 单元的信号， 并将之转换成电信号， 经过放大、 滤波后， 将信号传送到红外会 议系统主机； 红外会议系统主机通过红外收发器接收到来自红外会议讨论单元 的数字信号， 经放大、 变频 （由滤波电路和混频电路组成） 、 选频网络 （带通 滤波器） 选频后， 进行自动增益放大， 将之进行 QPSK解调、 数字解码， 分离出 数字音频信号和控制信号， 并将同吋接收到的来自多路红外会议讨论单元的数 字音频信号 （最多 6路） 进行混音， 再通过 D/A (数字 /模拟） 转换成模拟音频信 号， 送会场扩声系统， 同吋， 将接收到的控制信号送红外会议系统主机的控制 程序进行处理； 所述红外会议系统主机将控制信号进行编码、 QPSK调制， 经滤 波、 放大后送红外收发器， 红外收发器将来自红外会议系统主机的数字信号， 经滤波、 放大后， 通过红外发射管以红外光的形式进行广播； 各红外会议讨论 单元通过红外接收管接收到来自红外会议系统主机的数字信号， 经放大、 滤波 、 自动增益放大后， 进行 QPSK解调、 数字解码， 得到控制信号， 将接收到的控 制信号送红外会议讨论单元的控制程序进行处理。
[40] 所述红外会议系统主机以星型或手拉手方式连接多个红外收发器。 [41] 所述红外会议讨论单元包括一个麦克风， 一个话筒开关按键， 电池等部件。 红 外会议讨论单元接收来自红外会议系统主机以红外光形式广播的控制信号， 并 以红外光形式向红外会议系统主机发送控制信号， 话筒打开吋， 红外会议讨论 单元同吋以红外光形式向红外会议系统主机发送数字音频信号。 整个系统可以 使用任意数量的红外会议讨论单元， 但是在同一吋刻最多只有 4~6支红外会议讨 论单元的话筒能打开。
[42] 在上述数字音频信号和控制信息的编码、 QPSK调制过程中， 每一路数字音频 信号和控制信息的传输占用一个负载波频点 （一个传输通路） 。 由于可能有大 量的红外会议讨论单元同吋向红外会议系统主机发送控制信息 (比如很多话筒同 吋要求发言， 或进行电子表决吋)， 为提高从红外会议讨论单元到红外会议系统 主机的 "上行 "控制信息传输的速度， 可以将上述"上行"控制信息釆用独立的负载 波频点 （即釆用独立的传输通路） 进行传输。
[43] 图 1、 图 3、 图 6、 图 8、 图 13、 图 14示出了本发明的第四个实施例。
[44] 请参阅附图所示， 该数字会议讨论系统， 包括红外会议系统主机、 红外收发器 和红外会议讨论单元， 所述红外会议讨论单元中内置有 A/D (模拟 /数字） 转换 电路、 数字编码电路、 DQPSK调制器、 D/A (数字 /模拟） 转换电路、 解码电路 、 DQPSK解调器； 所述红外会议系统主机中内置有 DQPSK解调器、 数字解码电 路、 D/A (数字 /模拟） 转换电路、 编码电路、 DQPSK调制器， 一混音电路接于 D/A (数字 /模拟） 转换电路之后； 所述数字会议讨论系统将红外会议讨论单元 话筒拾音器获取的模拟音频信号进行放大， 经 A/D (模拟 /数字） 转换成数字音 频信号， 并与红外会议讨论单元的控制信号一起进行数字编码、 DQPSK调制、 滤波后， 通过红外发射管以红外光形式发射出去； 红外收发器通过红外接收管 接收来自红外会议讨论单元的信号， 并将之转换成电信号， 经过放大、 滤波后 ， 将信号传送到红外会议系统主机； 红外会议系统主机通过红外收发器接收到 来自红外会议讨论单元的数字信号， 经放大、 变频 （由滤波电路和混频电路组 成） 、 选频网络 （带通滤波器） 选频后， 进行自动增益放大， 将之进行 DQPSK 解调、 数字解码， 分离出数字音频信号和控制信号， 将数字音频信号通过 D/A ( 数字 /模拟） 转换成模拟音频信号， 并将同吋接收到的来自多路红外会议讨论单 元的音频信号 （最多 6路） 进行混音后， 送会场扩声系统， 同吋， 将接收到的控 制信号送红外会议系统主机的控制程序进行处理； 所述红外会议系统主机将控 制信号进行编码、 DQPSK调制， 经滤波、 放大后送红外收发器， 红外收发器将 来自红外会议系统主机的数字信号， 经滤波、 放大后， 通过红外发射管以红外 光的形式进行广播； 各红外会议讨论单元通过红外接收管接收到来自红外会议 系统主机的数字信号， 经放大、 滤波、 自动增益放大后， 进行 DQPSK解调、 数 字解码， 得到控制信号， 将接收到的控制信号送红外会议讨论单元的控制程序 进行处理。
[45] 所述红外会议系统主机以星型或手拉手方式连接多个红外收发器。
[46] 所述红外会议讨论单元包括一个麦克风， 一个话筒开关按键， 电池等部件。 红 外会议讨论单元接收来自红外会议系统主机以红外光形式广播的控制信号， 并 以红外光形式向红外会议系统主机发送控制信号， 话筒打开吋， 红外会议讨论 单元同吋以红外光形式向红外会议系统主机发送数字音频信号。 整个系统可以 使用任意数量的红外会议讨论单元， 但是在同一吋刻最多只有 4~6支红外会议讨 论单元的话筒能打开。
[47] 在上述数字音频信号和控制信息的编码、 DQPSK调制过程中， 每一路数字音 频信号和控制信息的传输占用一个负载波频点 （一个传输通路） 。 由于可能有 大量的红外会议讨论单元同吋向红外会议系统主机发送控制信息 (比如很多话筒 同吋要求发言， 或进行电子表决吋)， 为提高从红外会议讨论单元到红外会议系 统主机的"上行"控制信息传输的速度， 可以将上述"上行"控制信息釆用独立的负 载波频点 （即釆用独立的传输通路） 进行传输。
[48] 图 1、 图 9、 图 10、 图 11示出了本发明的第五个实施例。
[49] 请参阅附图所示， 该数字会议讨论系统， 包括红外会议系统主机、 红外收发器 和红外会议讨论单元， 所述红外会议讨论单元中内置有 A/D (模拟 /数字） 转换 电路、 数字编码电路、 DQPSK调制器； 所述红外会议系统主机中内置有 DQPSK 解调器、 数字解码电路和 D/A (数字 /模拟） 转换电路， 一混音电路接于数字解 码电路与 D/A (数字 /模拟） 转换电路之间； 所述数字议讨论系统将红外会议讨 论单元话筒拾音器获取的模拟音频信号进行放大， 并经 A/D (模拟 /数字） 转换 成数字音频信号， 进行数字编码、 DQPSK调制、 滤波后， 通过红外发射管以红 外光形式发射出去； 红外收发器通过红外接收管接收来自红外会议讨论单元的 信号， 并将之转换成电信号， 经过放大、 滤波后， 将信号传送到红外会议系统 主机； 红外会议系统主机通过红外收发器接收到来自红外会议讨论单元的数字 信号， 经放大、 变频 （由滤波电路和混频电路组成） 、 选频网络 （带通滤波器 ) 选频后， 进行自动增益放大， 将之进行 DQPSK解调、 数字解码， 得到数字音 频信号， 并将同吋接收到的来自多路红外会议讨论单元的数字音频信号 （最多 6 路） 进行混音， 再通过 D/A (数字 /模拟） 转换成模拟音频信号， 送会场扩声系
[50] 所述红外会议系统主机以星型或手拉手方式连接多个红外收发器。
[51] 所述红外会议讨论单元包括一个麦克风， 一个话筒开关按键， 电池等部件。 话 筒打开吋， 红外会议讨论单元以红外光形式向红外会议系统主机发送数字音频 信号。 整个系统可以使用任意数量的红外会议讨论单元， 但是在同一吋刻最多 只有 4~6支红外会议讨论单元的话筒能打开。
[52] 图 1、 图 9、 图 10、 图 12示出了本发明的第六个实施例。
[53] 请参阅附图所示， 该数字会议讨论系统， 包括红外会议系统主机、 红外收发器 和红外会议讨论单元， 所述红外会议讨论单元中内置有 A/D (模拟 /数字） 转换 电路、 数字编码电路、 QPSK调制电路； 所述红外会议系统主机中内置有 QPSK 解调电路、 数字解码电路和 D/A (数字 /模拟） 转换电路， 一混音电路接于 D/A ( 数字 /模拟） 转换电路之后； 所述数字议讨论系统将红外会议讨论单元话筒拾音 器获取的模拟音频信号进行放大， 并经 A/D (模拟 /数字） 转换成数字音频信号 ， 进行数字编码、 QPSK调制、 滤波后后， 通过红外发射管以红外光形式发射出 去； 红外收发器通过红外接收管接收来自红外会议讨论单元的信号， 并将之转 换成电信号， 经过放大、 滤波后， 将信号传送到红外会议系统主机； 红外会议 系统主机通过红外收发器接收到来自红外会议讨论单元的数字信号， 经放大、 变频 （由滤波电路和混频电路组成） 、 选频网络 （带通滤波器） 选频后， 进行 自动增益放大， 将之进行 QPSK解调、 数字解码， 得到数字音频信号， 再将数字 音频信号通过 D/A (数字 /模拟） 转换成模拟音频信号， 并将同吋接收到的来自 多路红外会议讨论单元的音频信号 （最多 6路） 进行混音后， 送会场扩声系统。
[54] 所述红外会议系统主机以星型或手拉手方式连接多个红外收发器。
[55] 所述红外会议讨论单元包括一个麦克风， 一个话筒开关按键， 电池等部件。 话 筒打开吋， 红外会议讨论单元以红外光形式向红外会议系统主机发送数字音频 信号。 整个系统可以使用任意数量的红外会议讨论单元， 但是在同一吋刻最多 只有 4~6支红外会议讨论单元的话筒能打开。
[56] 图 13示出了本发明第一、 二、 三、 四实施例所引用红外会议系统主机控制程序 的流程框图。
[57] 请参阅附图所示， 该控制程序， 包括如下步骤：
[58] (1)判断是否从上行通道收到会议单元发言申请命令 （步骤 201) ；
[59] (2)若步骤 201的判断结果为否， 则返回步骤 201 (步骤 202) ；
[60] (3)若步骤 201的判断结果为是， 则判断是否有空闲上行通道 （步骤 203) ；
[61] (4)若步骤 203的判断结果为否， 则返回步骤 201 (步骤 204) ；
[62] (5)若步骤 203的判断结果为是， 则为申请发言会议单元分配上行通道， 并将控 制信号通过下行信号通道发送给会议单元 （步骤 205) ；
[63] (6)结束 （步骤 206) 。
[64] 图 14示出了本发明第一、 二、 三、 四实施例所引用红外会议讨论单元控制程序 的流程框图。
[65] 请参阅附图所示， 该控制程序， 包括如下步骤：
[66] (1)判断是否能正常接受下行行号 （步骤 101) ；
[67] (2)若步骤 101的判断结果为否， 则返回步骤 101 (步骤 102) ；
[68] (3)若步骤 101的判断结果为是， 则判断是否从下行信号的控制数据中发现有空 闲上行通道 （步骤 103) ；
[69] (4)若步骤 103的判断结果为否， 则返回步骤 101 (步骤 104) ；
[70] (5)若步骤 103的判断结果为是， 则从空闲上行通道上发送"发言申请"命令 （步 骤 105) ；
[71] (6)
判断是否在 10ms内从下行信号的控制数据中发现主机同意发言的命令 （步骤 106 [72] (7)若步骤 106的判断结果为否， 则返回步骤 101 (步骤 107) ；
[73] (8)
若步骤 106的判断结果为是， 则开始使用主机指定的上行载波号， 发送音频及控 制信号 （步骤 108) ；
[74] (9)结束 （步骤 109) 。
[75] 以上所述仅为本发明的较佳实施例而已， 并不用以限制本发明， 凡在本发明的 精神和原则之内所作的任何修改、 等同替换和改进等， 均应包含在本发明的保 护范围之内。

Claims

权利要求书
1、 一种数字红外会议讨论系统， 包括红外会议系统主机、 红外收发器和红 外会议讨论单元， 其特征在于， 所述红外会议讨论单元中内置有音频 A/D 转换电路、 数字编码电路和数字调制电路， 且所述数字编码电路和数字调 制电路依次连接于所述音频 A/D转换电路之后； 所述红外会议系统主机中 内置有数字解调电路、 数字解码电路和音频 D/A转换电路， 数字解码电路 连接于数字解调电路之后， 一混音电路连接于所述数字解码电路和音频 D/ A转换电路之间或连接于所述音频 D/A转换电路之后。
2、 如权利要求 1所述的数字红外会议讨论系统， 其特征在于， 所述红外会 议讨论单元中还包括解调电路和连接于解调电路之后的解码电路， 且所述 解码电路解码所得信号送红外会议讨论单元的控制程序进行处理， 所述音 频 A/D转换电路输出的音频信号和红外会议讨论单元的控制信号一起输入 所述数字编码电路； 所述红外会议系统主机中还包括编码电路和连接于编 码电路之后的调制电路， 且所述数字解码电路解码所得信号送红外会议系 统主机的控制程序进行处理， 所述红外会议系统主机的控制信号输入所述 编码电路， 一混音电路连接于所述数字解码电路和音频 D/A转换电路之间 或连接于所述音频 D/A转换电路之后。
3、 如权利要求 2所述的数字红外会议讨论系统， 其特征在于， 所述红外会 议讨论单元还包括连接于所述解码电路之后的音频 D/A转换电路， 所述解 码电路和解调电路分别为数字解码电路和数字解调电路， 且所述数字解码 电路解码所得信号送红外会议讨论单元的控制程序进行处理， 所述音频 A/ D转换电路输出的音频信号和红外会议讨论单元的控制信号一起输入所述 数字编码电路； 所述红外会议系统主机的编码电路和调制电路分别为数字 编码电路和数字调制电路， 且所述数字解码电路解码所得信号送红外会议 系统主机的控制程序进行处理， 所述混音电路输出的音频信号和红外会议 系统主机的控制信号一起输入所述数字编码电路， 一混音电路连接于所述 红外会议系统主机数字解码电路和音频 D/A转换电路之间或连接于所述红 外会议系统主机音频 D/A转换电路之后。
4、 如权利要求 1所述的数字红外会议讨论系统， 其特征在于： 所述红外会 议讨论单元的数字调制电路选用 QPSK调制器、 DQPSK调制器中的一种， 对应的红外会议系统主机的数字解调电路釆用与红外会议讨论单元调制器 相一致的 QPSK解调器、 DQPSK解调器中的一种。
5、 一种红外会议讨论单元， 其特征在于， 所述红外会议讨论单元包括音频 A/D转换电路、 数字编码电路和数字调制电路， 且所述数字编码电路和数 字调制电路依次连接于所述音频 A/D转换电路之后。
6、 如权利要求 5所述的红外会议讨论单元， 其特征在于， 所述红外会议讨 论单元中还包括解调电路和连接于解调电路之后的解码电路， 且所述解码 电路解码所得信号送红外会议讨论单元的控制程序进行处理， 所述音频 A/ D转换电路输出的音频信号和红外会议讨论单元的控制信号一起输入所述 数字编码电路。
7、 如权利要求 6所述的红外会议讨论单元， 其特征在于， 所述红外会议讨 论单元还包括连接于所述解码电路之后的音频 D/A转换电路， 所述解码电 路和解调电路分别为数字解码电路和数字解调电路， 且所述数字解码电路 解码所得信号送红外会议讨论单元的控制程序进行处理， 所述音频 A/D转 换电路输出的音频信号和红外会议讨论单元的控制信号一起输入所述数字 编码电路。
8、 一种红外会议系统主机， 其特征在于， 所述红外会议系统主机包括数字 解调电路、 数字解码电路和 D/A转换电路， 数字解码电路连接于数字解调 电路之后， 一混音电路连接于所述数字解码电路和 D/A转换电路之间或连 接于所述 D/A转换电路之后。
9、 如权利要求 8红外会议系统主机， 其特征在于， 所述红外会议系统主机 中还包括编码电路和连接于编码电路之后的调制电路， 且所述数字解码电 路解码所得信号送红外会议系统主机的控制程序进行处理， 所述红外会议 系统主机的控制信号输入所述编码电路， 一混音电路连接于所述数字解码 电路和音频 D/A转换电路之间或连接于所述音频 D/A转换电路之后。
10、 如权利要求 9红外会议系统主机， 其特征在于， 所述红外会议系统主机 的编码电路和调制电路分别为数字编码电路和数字调制电路， 且所述数字 解码电路解码所得信号送红外会议系统主机的控制程序进行处理， 所述混 音电路输出的音频信号和红外会议系统主机的控制信号一起输入所述数字 编码电路， 一混音电路连接于所述红外会议系统主机数字解码电路和音频 D/A转换电路之间或连接于所述红外会议系统主机音频 D/A转换电路之后。
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