CN101820372A - TDM (Time Division Multiplexing) single-bus communication system of power supply, data signals and audio analog signals - Google Patents
TDM (Time Division Multiplexing) single-bus communication system of power supply, data signals and audio analog signals Download PDFInfo
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Abstract
The invention discloses a TDM (Time Division Multiplexing) single-bus communication system of power supply, data signals and audio analog signals, which comprises a power supply module and at least two communication modules connected with a power supply/communication bus. Impedance-matching resistors are respectively bridged above the start end and the terminal end of the power supply/communication bus. The communication module comprises a rectifying and voltage-stabilizing circuit, a data signal sending circuit, a data signal receiving circuit, an audio analog signal sending circuit, an audio analog signal receiving circuit and a communication control circuit. The bus power supply communication system has simple structure circuit, greatly simplified complexity and decreased cost and supports master-slave communication and peer-to-peer communication when a multi-point bus communication mode is formed.
Description
Technical field
The present invention relates to the circuit that a kind of low-voltage dc power supply line and data signal line and audio analog signals line transmit simultaneously, belong to communication and fieldbus transmission technique field.
Background technology
In fields such as Industry Control, intelligent building, monitoring of toolss, a large amount of demands that exist test point that the scene is disperseed and control point to be connected by bussing technique.Bussing technique commonly used at present has RS485, CAN, ProfiBus etc.Compare with centralized star-like line, bus mode can significantly reduce the total length of line and the complexity of wiring.The interface of each bus module only needs two pairs of lines: a pair of power line and a pair of data signal line.Needing the occasion of voice communication,, also need other a pair of audio analog signals line such as the intelligent building intercom system.
In order further to reduce line, the technology by a pair of line while transmission signals and power supply is also arranged at present.These technology generally are to adopt the method for carrying out the carrier signal stack on power line.Adopt this method to have following shortcoming: 1, cost increases; 2, transmission range and speed are restricted; 3, the node number is limited on the bus; 4, the performance requirement to power supply and accepting device increases.Therefore, a kind of simple cheaply power line communication transmission circuit of design becomes needs.
Summary of the invention
The purpose of this invention is to provide a kind of bus communication system that on a pair of power supply/communication bus, can realize power supply supply, data and audio analog signals transmission simultaneously.
A kind of power supply, data-signal, the time-multiplexed monobus communication system of audio analog signals, comprise power module and at least two communication modules of being connected on power supply/communication bus, the top of power supply/communication bus and terminal be impedance matching resistance of cross-over connection (Rz1, Rz2) respectively.
Described communication module comprises:
Regulator rectifier circuit;
The data-signal transtation mission circuit is used for sending digital signal to power supply/communication bus;
The data-signal receiving circuit is used to receive the digital signal on power supply/communication bus;
The audio analog signals transtation mission circuit of band audio collecting device is used to gather audio signal and is sent to power supply/communication bus;
The audio analog signals receiving circuit of band audio playing apparatus is used to receive the audio signal on power supply/communication bus and plays;
Communication control circuit is used for sending to audio analog signals transtation mission circuit and audio analog signals receiving circuit according to predetermined condition and enables control signal.
Signal on described power supply/communication bus has the slot cycle of Fixed Time Interval, and this slot cycle is divided into power supply stage, data communication phase and voice communication stage, wherein:
Power supply is during the stage, and power module is powered to data-signal transtation mission circuit, data-signal receiving circuit, audio analog signals transtation mission circuit, audio analog signals receiving circuit and communication control circuit by the regulator rectifier circuit in the communication module;
During data communication phase, the data-signal transtation mission circuit sends digital signal to power supply/communication bus under the control of communication control circuit, and the data-signal receiving circuit will send to communication control circuit from the digital signal that power supply/communication bus receives;
Audio analog signals transtation mission circuit and audio analog signals receiving circuit send during the stage at voice communication, received audio signal.
Described power module comprises power switch circuit and ON-OFF control circuit, the input of power switch circuit links to each other with DC power supply, output termination power/communication bus, the ON-OFF control circuit power switch that is used for to power switch circuit that links to each other with power switch circuit provides control signal.
Described power supply/communication bus links to each other with the input of regulator rectifier circuit, the input of data-signal receiving circuit, the input of audio analog signals receiving circuit, the output of data-signal transtation mission circuit and the output of audio analog signals transtation mission circuit respectively;
The digital signal output end of described data-signal receiving circuit links to each other with the digital signal receiving terminal of communication control circuit;
The signal input end that enables of described audio analog signals transtation mission circuit and audio analog signals receiving circuit all links to each other with the control signal output ends that enables of communication control circuit;
The output of described regulator rectifier circuit links to each other with the power input of data-signal transtation mission circuit, data-signal receiving circuit, audio analog signals transtation mission circuit, audio analog signals receiving circuit and communication control circuit.
The audio analog signals transtation mission circuit comprises input amplifying circuit, anti-aliasing low pass filter, output circuit, output resistance and enables control circuit;
The input of input amplifying circuit links to each other with audio collecting device, the output of input amplifying circuit links to each other with the input of anti-aliasing low pass filter, the output of anti-aliasing low pass filter links to each other with the input of output circuit, the output of output circuit links to each other with power supply/communication bus through an output resistance, the power input that enables control circuit links to each other with the output of regulator rectifier circuit, and the power output end that enables control circuit is respectively input amplifying circuit, anti-aliasing low pass filter and output circuit provides power supply;
The signal input end that enables that enables control circuit links to each other with the control signal output ends that enables of communication control circuit.
Described audio analog signals receiving circuit comprises input follow circuit, anti-side-tone circuit, sampling hold circuit, low pass filter, audio power amplifying circuit and enables control circuit;
The input of input follow circuit links to each other with power supply/communication bus, the output of input follow circuit and the input of anti-side-tone circuit link to each other, the output of anti-side-tone circuit links to each other with the input of sampling hold circuit, the output of sampling hold circuit links to each other with the input of low pass filter, the output of low pass filter links to each other with the input of audio power amplifying circuit, and the output of audio power amplifying circuit links to each other with audio playing apparatus;
The power output end that enables control circuit is respectively input follow circuit, anti-side-tone circuit, sampling hold circuit, low pass filter and audio power amplifying circuit provides power supply;
The sampling retentive control signal input part of sampling hold circuit links to each other with the sampling inhibit signal output of communication control circuit.
The anti-sidetone signal input part of the anti-side-tone circuit in the output of the anti-aliasing low pass filter in the described audio analog signals transtation mission circuit and the audio analog signals receiving circuit links to each other.
The output resistance of the audio analog signals transtation mission circuit of described impedance matching resistance and all communication modules has identical resistance value, and its resistance value equals the characteristic impedance of power supply/communication bus.
Analog signal transtation mission circuit in the described communication module and analog signal receiving circuit are subjected to the control that enables to control pin of communication control circuit, when not being enabled, audio analog signals transtation mission circuit and audio analog signals receiving circuit power consumption are zero, disconnect with power supply/communication bus.
Enable control circuit in audio analog signals transtation mission circuit of the present invention and the audio analog signals receiving circuit, can be provided with respectively, also can shared one enable control circuit, when enabling control circuit for shared one, the signal input end that enables that enables control circuit links to each other just passable with the control signal output ends that enables of communication control circuit, when audio analog signals transtation mission circuit and audio analog signals receiving circuit when independent setting enables control circuit respectively, the control circuit that enables in the audio analog signals transtation mission circuit needs link to each other with the control signal output ends that enables of communication control circuit respectively with the control circuit that enables in the audio analog signals receiving circuit.
Native system defines corresponding frame format on the basis of realizing the position transmission, just can realize the data communication between communication node.By the design of communications agreement, can coordinate the work of all communication modules, guarantee that at any time two communication module busy channels are arranged on power supply/communication bus at the most and be in communications status, other communication modules then are in wait state.Pin is controlled its audio analog signals transtation mission circuit and the audio analog signals receiving circuit is not worked by enabling to control to be in the communication control circuit of communication module of wait state, be in power-down state, on power supply/communication bus, present high-impedance state, can the communication module of communicating by letter not impacted.
Bus supplying communication system circuit structure of the present invention is simple, has simplified the complexity of circuit greatly and has reduced cost.When constituting multinode bus communication mode, support master-slave communication and peer-to-peer communications.
Description of drawings
Fig. 1 is the formation block diagram of power supply, data-signal, the time-multiplexed monobus communication system of audio analog signals;
Fig. 2 is the formation block diagram of power module;
Fig. 3 is the formation block diagram of communication module;
Fig. 4 is the formation block diagram of audio analog signals transtation mission circuit;
Fig. 5 is the formation block diagram of audio analog signals receiving circuit;
Fig. 6 is a kind of practical circuit of concrete power module;
Fig. 7 is a kind of example of data-signal transtation mission circuit, data-signal receiving circuit, regulator rectifier circuit and communication control circuit of concrete communication module;
Fig. 8 is a kind of example of concrete audio analog signals transtation mission circuit;
Fig. 9 is a kind of example of concrete audio analog signals receiving circuit;
Figure 10 is the schematic diagram of the voltage waveform in several slots cycle on the bus.
Embodiment
With reference to Fig. 1, power supply of the present invention, data-signal, the time-multiplexed monobus communication system of audio analog signals, comprise power module 1 and at least two communication modules 2 of being connected on power supply/communication bus, the top of power supply/communication bus and terminal be impedance matching resistance of cross-over connection (resistance R z1 and resistance R z2) respectively.
Power module 1 as shown in Figure 2, comprise power switch circuit 3 and ON-OFF control circuit 4, the input of power switch circuit 3 links to each other with DC power supply, output termination power/communication bus, ON-OFF control circuit 4 power switch that is used for to power switch circuit 3 that links to each other with power switch circuit 3 provides control signal.
Communication module 2 comprises as shown in Figure 3:
Data-signal transtation mission circuit 6 is used for sending digital signal to power supply/communication bus;
Data-signal receiving circuit 7 is used to receive the digital signal on power supply/communication bus;
The audio analog signals transtation mission circuit 8 of band audio collecting device 11 is used to gather audio signal and is sent to power supply/communication bus;
The audio analog signals receiving circuit 9 of band audio playing apparatus 12 is used to receive the audio signal on power supply/communication bus and plays;
Power supply/communication bus links to each other with the input of regulator rectifier circuit 5, the input of data-signal receiving circuit 7, the input of audio analog signals receiving circuit 9, the output of data-signal transtation mission circuit 6 and the output of audio analog signals transtation mission circuit 8 respectively;
The digital signal output end of data-signal receiving circuit 7 links to each other with the digital signal receiving terminal of communication control circuit 10;
The signal input end that enables of audio analog signals transtation mission circuit 8 and audio analog signals receiving circuit 9 all links to each other with the control signal output ends that enables of communication control circuit 10;
The output of regulator rectifier circuit 5 links to each other with data-signal transtation mission circuit 6, data-signal receiving circuit 7, audio analog signals transtation mission circuit 8, audio analog signals receiving circuit 9 and the power input of communication control circuit 10.
Audio analog signals transtation mission circuit 8 comprises input amplifying circuit 13, anti-aliasing low pass filter 14, output circuit 15, output resistance (Rs) and enables control circuit 16 as shown in Figure 4;
The input of input amplifying circuit 13 links to each other with audio collecting device 11, the output of input amplifying circuit 13 links to each other with the input of anti-aliasing low pass filter 14, the output of anti-aliasing low pass filter 14 links to each other with the input of output circuit 15, the output of output circuit 15 links to each other with power supply/communication bus through an output resistance (Rs), the power input that enables control circuit 16 links to each other with the output of regulator rectifier circuit 5, and the power output end that enables control circuit 16 is respectively input amplifying circuit 13, anti-aliasing low pass filter 14 and output circuit 15 provide power supply;
The signal input end that enables that enables control circuit 16 links to each other with the control signal output ends that enables of communication control circuit 10.
Audio analog signals receiving circuit 9 comprises input follow circuit 17, anti-side-tone circuit 18, sampling hold circuit 19, low pass filter 20, audio power amplifying circuit 21 and enables control circuit 16 as shown in Figure 5;
The input of input follow circuit 17 links to each other with power supply/communication bus, the output of input follow circuit 17 and the input of anti-side-tone circuit 18 link to each other, the output of anti-side-tone circuit 18 links to each other with the input of sampling hold circuit 19, the output of sampling hold circuit 19 links to each other with the input of low pass filter 20, the output of low pass filter 20 links to each other with the input of audio power amplifying circuit 21, and the output of audio power amplifying circuit 21 links to each other with audio playing apparatus 12;
The power output end that enables control circuit 16 is respectively input follow circuit 17, anti-side-tone circuit 18, sampling hold circuit 19, low pass filter 20 and audio power amplifying circuit 21 provides power supply;
The sampling retentive control signal input part of sampling hold circuit 19 links to each other with the sampling inhibit signal output of communication control circuit 10.
The anti-sidetone signal input part of the anti-side-tone circuit 18 in the output of the anti-aliasing low pass filter 14 in the described audio analog signals transtation mission circuit 8 and the audio analog signals receiving circuit 9 links to each other.
The output resistance Rs of the audio analog signals transtation mission circuit 8 of impedance matching resistance R z1, impedance matching resistance R z2 and all communication modules 2 has identical resistance value, and its resistance value equals the characteristic impedance of power supply/communication bus.
Analog signal transtation mission circuit 8 in the communication module 2 and analog signal receiving circuit 9 are subjected to the control that enables to control pin of communication control circuit 10, when not being enabled, audio analog signals transtation mission circuit 8 and audio analog signals receiving circuit 9 power consumptions are zero, disconnect with power supply/communication bus.
Signal on power supply/communication bus has the slot cycle of Fixed Time Interval, and this slot cycle is divided into power supply stage T1, data communication phase T2 and voice communication stage T3, wherein:
During power supply stage T1, power module 1 is powered to data-signal transtation mission circuit 6, data-signal receiving circuit 7, audio analog signals transtation mission circuit 8, audio analog signals receiving circuit 9 and communication control circuit 10 by the regulator rectifier circuit 5 in the communication module 2;
During data communication phase T2, data-signal transtation mission circuit 6 sends digital signal to power supply/communication bus under the control of communication control circuit 10, and data-signal receiving circuit 7 will send to communication control circuit 10 from the digital signal that power supply/communication bus receives;
Audio analog signals transtation mission circuit 8 and audio analog signals receiving circuit 9 send when voice communication stage T3, received audio signal.
Figure 10 has provided the schematic diagram of voltage waveform on power supply/communication bus.
Fig. 6 is a kind of practical circuit of concrete power module 1, power MOS pipe Q1 is a power switch, hardware logic electric circuits such as triode Q2 and pull-up resistor R1 and MCU or FPGA, CPLD constitute ON-OFF control circuit, and turning on and off of power MOS pipe Q1 controlled.At power supply stage T1, when the ground level control signal of triode Q2 is high level, triode Q2 conducting, power MOS pipe Q1 conducting thereupon, power module output positive electricity is pressed onto power supply/communication bus, is communication module 2 power supplies; At data communication phase T2 and voice communication stage T3, the ground level control signal of triode Q2 is a low level, and triode Q2 turn-offs, power MOS pipe Q1 turn-offs thereupon, power module turn-offs output, power supply/communication bus is presented high-impedance state, for communication module 2 communicates the channel of amortizing out.Power MOS pipe Q1 also can be other power semiconductor switches such as IGBT, GTR.
Fig. 7 is a kind of example of data-signal transtation mission circuit 8, data-signal receiving circuit 9, regulator rectifier circuit 5 and communication control circuit 10 of concrete communication module 2.Diode D1 and capacitor C 1 constitute rectification circuit, pulse voltage on power supply/communication bus is rectified into basicly stable direct voltage, and the first voltage stabilizing chip provides stable two-way DC power supply with the second voltage stabilizing chip to the analog-and digital-circuit with different voltage requirements.Triode Q3 and triode Q4 composition data signal sending circuit.At data communication phase T2, the data of data transmit circuit send the turn-on and turn-off of pin by triode Q4 control triode Q3, when triode Q3 conducting, present high level on the bus, send data " 0 "; When triode Q3 turn-offs, present low level on the bus, send data " 1 ".When being in power supply stage T1 or voice communication stage T3, triode Q3 also is in off state, can not disturb power supply and voice communication.The data-signal receiving circuit is a single-ended comparison circuit of being made up of the comparator chip, whether the level on the bus is surpassed threshold value Vref is judged, if surpass threshold value Vref, then think sending data " 0 " on the bus, otherwise think and send data " 1 ".Communication control circuit can be realized by a slice MCU programming, also can be hardware logic electric circuits such as FPGA, CPLD.
Fig. 8 is a kind of example of concrete audio analog signals transtation mission circuit 8.Operational amplifier U8 and resistance on every side thereof constitute see-saw circuit, and the audio voltage signal that microphone is imported amplifies, and C6 is a capacitance.Operational amplifier U7 and resistance capacitance on every side thereof constitute multichannel feedback second-order low-pass filter circuit.Operational amplifier U6 and resistance R on every side 5 thereof, R4, diode D2 and triode Q5 constitute output circuit, when power supply/communication bus is in power supply stage T1 or when being in data communication phase T2 and certain communication module and on bus, exporting high level, diode D2 automatic cut-off (this is because supply voltage is higher than the maximum output voltage of operational amplifier); When the power supply communication bus is in when not having the communication module output voltage on data communication phase T2 and the power supply/communication bus, diode D2 conducting, certain voltage appears on the bus, for avoiding this moment that the data communication on the bus is caused interference, can higher threshold value Vref be set to the data receiving circuit, make the data bit " 1 " on the bus can not be mistaken for " 0 "; When bus is in voice communication stage T3, the automatic conducting of diode D2 outputs to audio voltage signal on the bus.Above-mentioned the analysis showed that this circuit by diode D2 automatic conducting or end, realized that power supply of voice communication and power supply and data communication are independent of each other.MID is 1/2nd of an operational amplifier power supply voltage, is the reference zero of the analog circuit that operational amplifier is formed under the single power supply, can operational amplifier power supply dividing potential drop be obtained by two substitutional resistances.Triode Q6, triode Q7 and resistance R 11 constitutes and enables control circuit, and whether control audio analog signal transtation mission circuit works, when communication control circuit enable to control pin and be high level the time, triode Q7, triode Q6 conducting, circuit powers on; When communication control circuit enable to control pin and be low level the time, triode Q7, triode Q6 end, circuit is in power-down state, and because the unilateral conduction of diode D2, this moment, the audio analog signals transtation mission circuit presented high-impedance state on bus.
Fig. 9 is a kind of example of concrete audio analog signals receiving circuit 9.Operational amplifier U9 constitutes follower, makes the audio analog signals receiving circuit present high-impedance state on bus, does not influence communication.Operational amplifier U10 and on every side resistance constitute anti-phase adder, because the anti-sidetone signal that the audio analog signals transtation mission circuit sends outputs to the signal of bus with it just in time anti-phase, therefore will can obtain useful signal by the cancellation sidetone behind signal on the bus and the anti-sidetone signal plus.Sampling keep chip U11 and on every side resistance capacitance constitute sampling hold circuit, keep under the control of pin output sampling to operational amplifier U10 in the communication control circuit sampling.Operational amplifier U12 and on every side resistance capacitance constitute multichannel feedback second-order low-pass filter, the stairstepping signal restoring after the sampling of operational amplifier U10 output is kept is an audio signal.Diode D3, diode D4, triode Q8 and triode Q9 constitute the push-pull type power output circuit, and C8 outputs to loud speaker through capacitance, converts sound to.It is shared to enable control circuit and audio analog signals receiving circuit shown in Figure 8.
By the design of communications agreement, guarantee that any moment has two communication modules 2 to be in communications status at most, can send audio frequency and data-signal mutually, wherein audio signal communication is carried out with full duplex mode, and data-signal communication is carried out with half-duplex mode.The communication module that is not in communications status 2 by the communication protocol regulation must be in holding state, by its communication control circuit its audio analog signals transtation mission circuit 8 and audio analog signals are accepted circuit 9 cancellations and enable, and make the triode Q3 of its data transmit circuit be in closed condition.The communication module that is in holding state can not cause interference to the communication on the bus, and power consumption is very little.When each communication module can take bus (promptly being in communications status), when must abdicate bus (promptly being in holding state) and all be coordinated by communication protocol, and communication protocol can be realized by software programming, also can be solidificated in the hardware by logical circuit.Native system is supported master-slave mode communication and peer-to-peer communications.
Claims (9)
1. a power supply, data-signal, the time-multiplexed monobus communication system of audio analog signals, comprise the power module (1) and at least two communication modules (2) that are connected on power supply/communication bus, the top of power supply/communication bus and terminal be impedance matching resistance of cross-over connection (Rz1, Rz2) respectively, it is characterized in that described communication module (2) comprising:
Regulator rectifier circuit (5);
Data-signal transtation mission circuit (6) is used for sending digital signal to power supply/communication bus;
Data-signal receiving circuit (7) is used to receive the digital signal on power supply/communication bus;
The audio analog signals transtation mission circuit (8) of band audio collecting device (11) is used to gather audio signal and is sent to power supply/communication bus;
The audio analog signals receiving circuit (9) of band audio playing apparatus (12) is used to receive the audio signal on power supply/communication bus and plays;
Communication control circuit (10); Be used for sending to audio analog signals transtation mission circuit (8) and audio analog signals receiving circuit (9) and enable control signal according to predetermined condition;
Signal on described power supply/communication bus has the slot cycle of Fixed Time Interval, and this slot cycle is divided into power supply stage (T1), data communication phase (T2) and voice communication stage (T3), wherein:
During the power supply stage (T1), power module (1) is powered to data-signal transtation mission circuit (6), data-signal receiving circuit (7), audio analog signals transtation mission circuit (8), audio analog signals receiving circuit (9) and communication control circuit (10) by the regulator rectifier circuit (5) in the communication module (2);
During data communication phase (T2), data-signal transtation mission circuit (6) sends digital signal to power supply/communication bus under the control of communication control circuit (10), data-signal receiving circuit (7) will send to communication control circuit (10) from the digital signal that power supply/communication bus receives;
Audio analog signals transtation mission circuit (8) and audio analog signals receiving circuit (9) sent when the voice communication stage (T3), received audio signal.
2. monobus communication system as claimed in claim 1, it is characterized in that, power module (1) comprises power switch circuit (3) and ON-OFF control circuit (4), the input of power switch circuit (3) links to each other with DC power supply, output termination power/communication bus, ON-OFF control circuit (4) links to each other with power switch circuit (3), and being used for provides control signal to the power switch of power switch circuit (3).
3. monobus communication system as claimed in claim 1, it is characterized in that described power supply/communication bus links to each other with the input of regulator rectifier circuit (5), the input of data-signal receiving circuit (7), the input of audio analog signals receiving circuit (9), the output of data-signal transtation mission circuit (6) and the output of audio analog signals transtation mission circuit (8) respectively.
4. monobus communication system as claimed in claim 1 is characterized in that, the digital signal output end of described data-signal receiving circuit (7) links to each other with the digital signal receiving terminal of communication control circuit (10);
The signal input end that enables of described audio analog signals transtation mission circuit (8) and audio analog signals receiving circuit (9) all links to each other with the control signal output ends that enables of communication control circuit (10);
The output of described regulator rectifier circuit (5) links to each other with data-signal transtation mission circuit (6), data-signal receiving circuit (7), audio analog signals transtation mission circuit (8), audio analog signals receiving circuit (9) and the power input of communication control circuit (10).
5. monobus communication system as claimed in claim 1, it is characterized in that described audio analog signals transtation mission circuit (8) comprises input amplifying circuit (13), anti-aliasing low pass filter (14), output circuit (15), output resistance (Rs) and enables control circuit (16);
The input of input amplifying circuit (13) links to each other with audio collecting device (11), the output of input amplifying circuit (13) links to each other with the input of anti-aliasing low pass filter (14), the output of anti-aliasing low pass filter (14) links to each other with the input of output circuit (15), the output of output circuit (15) links to each other with power supply/communication bus through an output resistance (Rs), the power input that enables control circuit (16) links to each other with the output of regulator rectifier circuit (5), and the power output end that enables control circuit (16) is respectively input amplifying circuit (13), anti-aliasing low pass filter (14) and output circuit (15) provide power supply;
The signal input end that enables that enables control circuit (16) links to each other with the control signal output ends that enables of communication control circuit (10).
6. monobus communication system as claimed in claim 5, it is characterized in that described audio analog signals receiving circuit (9) comprises input follow circuit (17), anti-side-tone circuit (18), sampling hold circuit (19), low pass filter (20), audio power amplifying circuit (21) and enables control circuit (16);
The input of input follow circuit (17) links to each other with power supply/communication bus, the output of input follow circuit (17) and the input of anti-side-tone circuit (18) link to each other, the output of anti-side-tone circuit (18) links to each other with the input of sampling hold circuit (19), the output of sampling hold circuit (19) links to each other with the input of low pass filter (20), the output of low pass filter (20) links to each other with the input of audio power amplifying circuit (21), and the output of audio power amplifying circuit (21) links to each other with audio playing apparatus (12);
The power output end that enables control circuit (16) is respectively input follow circuit (17), anti-side-tone circuit (18), sampling hold circuit (19), low pass filter (20) and audio power amplifying circuit (21) provides power supply;
The sampling retentive control signal input part of sampling hold circuit (19) links to each other with the sampling inhibit signal output of communication control circuit (10).
7. monobus communication system as claimed in claim 6, it is characterized in that the anti-sidetone signal input part of the anti-side-tone circuit (18) in the output of the anti-aliasing low pass filter (14) in the described audio analog signals transtation mission circuit (8) and the audio analog signals receiving circuit (9) links to each other.
8. monobus communication system according to claim 5, it is characterized in that, the output resistance (Rs) of the audio analog signals transtation mission circuit (8) of described impedance matching resistance (Rz1, Rz2) and all communication modules (2) has identical resistance value, and its resistance value equals the characteristic impedance of power supply/communication bus.
9. monobus communication system according to claim 1, it is characterized in that, analog signal transtation mission circuit (8) in the described communication module (2) and analog signal receiving circuit (9) be not when being enabled, audio analog signals transtation mission circuit (8) and audio analog signals receiving circuit (9) power consumption are zero, disconnect with power supply/communication bus.
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| CN2010101259725A CN101820372B (en) | 2010-03-17 | 2010-03-17 | TDM (Time Division Multiplexing) single-bus communication system of power supply, data signals and audio analog signals |
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| CN2010101259725A CN101820372B (en) | 2010-03-17 | 2010-03-17 | TDM (Time Division Multiplexing) single-bus communication system of power supply, data signals and audio analog signals |
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| CN101820372B CN101820372B (en) | 2012-01-04 |
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| US11211051B2 (en) | 2019-07-03 | 2021-12-28 | Baidu Online Network Technology (Beijing) Co., Ltd. | Method and apparatus for processing audio data |
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