CN104602174A - Four-path audio output system based on eight-bit single chip microcomputer - Google Patents
Four-path audio output system based on eight-bit single chip microcomputer Download PDFInfo
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- CN104602174A CN104602174A CN201510009902.6A CN201510009902A CN104602174A CN 104602174 A CN104602174 A CN 104602174A CN 201510009902 A CN201510009902 A CN 201510009902A CN 104602174 A CN104602174 A CN 104602174A
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Abstract
The invention discloses a four-path audio output system based on an eight-bit single chip microcomputer. The four-path audio output system includes an audio server, a single chip microcomputer connected with the audio server and audio decoding chips connected with the single chip microcomputer, wherein the single chip microcomputer includes a eight-bit single chip microcomputer MCU1 and a eight-bit single chip microcomputer MCU2, the single chip microcomputer MCU1 is connected with the audio server by an Internet access and receives four-path audio stream signals thereof, the single chip microcomputer MCU1 is connected with one audio decoding chip by an IIS interface and outputs two paths of the four-path audio stream signals to the same, the single chip microcomputer MCU1 is connected with the single chip microcomputer MCU2 by a serial port and output the residual two paths of the four-path audio stream signals to the same by a corresponding serial port protocol, and the single chip microcomputer MCU2 is connected with the other audio decoding chip by the IIS interface and outputs two paths of the four-path audio stream signals to the same. The four-path audio output system achieves the output of four-path audio signals by simple design and little cost, and only uses one Internet access to achieve the independent playing effect of the multi-path audio signal source.
Description
Technical field
The present invention relates to vehicle-mounted passenger information system technical field, be specifically related to a kind of EMU passenger information system, based on 4 tunnel independent audio output systems of 8 single-chip microcomputers.
Background technology
Network multichannel voice frequency output is the part in vehicle-mounted passenger information system, it is played back the multipath audio signal of audio/video server by different paths, in EMU sleeper, experience by bus to optimize passenger, a set of audio-visual playback terminal is provided with in each bunk, its terminal needs independently audio frequency and exports, and this just needs to install a set of multichannel voice frequency output system in each sleeping berth compartment; At present, the project plan comparison that the multichannel voice frequency of non-vehicular applications exports is many, have based on the SOC audio processing chip of monolithic, controlled by MCU, the audio signal of output multi-channel; Have based on the broadcasting plate of multi-disc MP3, form a combination, broadcast the different audio signal of multichannel.But above-mentioned multichannel voice frequency output scheme, if realized with single chip solution, the IIS output port that it requires is very complicated, for ARM framework CPU, be at least the above CPU of ARM7 system to possess relevant data-handling capacity, but its design Costco Wholesale is high, and circuit is complicated, design cycle is long, without any advantage; In addition, in audio decoder chip, can export all interior band DSP or CPU of chip of 4 tunnel independent audio, Costco Wholesale is very high, relative to design, also will increase the driving design of system, the project cycle is increased simultaneously.
Multichannel voice frequency output system of the present invention plays demand based on the vehicle-mounted video display of EMU, considers the access of single network interface, with 3U case back plate netting twine for transmission medium, and can realize functions of modules with the form of 3U board.Make control chip with 8 single-chip microcomputers, and be aided with the simplest audio decoder chip, realize the independently audio frequency output of 4 tunnels, use under the environment of EMU dynamic operation, more reliably, stablize, cost performance is very high.
Summary of the invention
The object of the invention is to realize motor train unit carries in passenger information system, exports based on 8 chip microcontroller multichannel independent audio.Present invention employs and realize controlling with the simplest 8 single-chip microcomputer schemes, and add most ordinary audio decoding chip, the independence achieving multichannel voice frequency exports, the method greatly reduces the cost of product, too increase flexibility and the extensibility of product design, and more reliable and more stable meet demand, be conducive to the popularization in market.
For realizing above-mentioned technical purpose, reach above-mentioned technique effect, the present invention is achieved through the following technical solutions:
A kind of 4 tunnel independent audio output systems based on 8 single-chip microcomputers, comprise audio server, the single-chip microcomputer of audio server is connected by switch and corresponding network interface, and the audio decoder chip of single-chip microcomputer is connected by IIS interface, described single-chip microcomputer comprises single-chip microprocessor MCU 1 and the single-chip microprocessor MCU 2 of two 8, described single-chip microprocessor MCU 1 connects audio server by network interface and receives its 4 road audio stream signal, described single-chip microprocessor MCU 1 connects an audio decoder chip by IIS interface and it is exported to 2 tunnels in 4 road audio stream signals, described single-chip microprocessor MCU 1 connects single-chip microprocessor MCU 2 by serial ports and exports remaining 2 tunnels in 4 road audio stream signals by corresponding serial port protocol to it, described single-chip microprocessor MCU 2 connects another audio decoder chip by IIS interface and it is exported to 2 road audio stream signals, two audio decoder chips are converted the digital audio stream signal of acquisition to simulated audio signal respectively and are exported by corresponding I/O mouth.
Further, the different audio-source in selected 4 tunnels of described audio server, is inputted from network interface end by network port driving in the mode of data flow by standard audio format.
Further, described standard audio format comprises WAV form, AAC form or WA form.
Further, described audio decoder chip separates independent output by its DATA sequential L channel and right channel audio signal.
Further, described audio decoder chip postorder is connected with audio drive circuitry, carries out signal power amplification and is transported to playback terminal.
The invention has the beneficial effects as follows:
1, the present invention is by simpler design, with few cost, realizes multipath audio signal and exports, and only use a network interface, reach the independent play-out effect in multipath audio signal source.
2, realized the function of more complicated by the most frequently used chip, add the reliability of design, expanded exploitation flexibility, reduced cost, decreased the development time.
3, from the angle of application, again in reliable, the most stable mode, the practical application request in dynamic train environment is met.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention;
Fig. 2 is left and right acoustic channels independent audio output principle schematic diagram (output from audio decoder chip) of the present invention;
Fig. 3 is embodiment of the present invention system architecture diagram.
Embodiment
Below with reference to the accompanying drawings and in conjunction with the embodiments, describe the present invention in detail.
With reference to shown in Fig. 1, a kind of 4 tunnel independent audio output systems based on 8 single-chip microcomputers, comprise audio server, the single-chip microcomputer of audio server is connected by switch and corresponding network interface, and the audio decoder chip of single-chip microcomputer is connected by IIS interface, described single-chip microcomputer comprises single-chip microprocessor MCU 1 and the single-chip microprocessor MCU 2 of two 8, described single-chip microprocessor MCU 1 connects audio server by network interface and receives its 4 road audio stream signal, described single-chip microprocessor MCU 1 connects an audio decoder chip by IIS interface and it is exported to 2 tunnels in 4 road audio stream signals, described single-chip microprocessor MCU 1 connects single-chip microprocessor MCU 2 by serial ports and exports remaining 2 tunnels in 4 road audio stream signals by corresponding serial port protocol to it, described single-chip microprocessor MCU 2 connects another audio decoder chip by IIS interface and it is exported to 2 road audio stream signals, two audio decoder chips are converted the digital audio stream signal of acquisition to simulated audio signal respectively and are exported by corresponding I/O mouth.
In the present embodiment, described switch configuration in 3U cabinet, as 4 road audio stream signal sources.
The different audio-source in selected 4 tunnels of described audio server, inputted from network interface end by network port driving in the mode of data flow by standard audio format, described standard audio format comprises WAV form, AAC form or WA form.
Described audio decoder chip is separated L channel and right channel audio signal exported by its DATA sequential, and audio decoder chip postorder is connected with audio drive circuitry, carries out signal power amplification, and is transported to playback terminal.
In the present embodiment, following three parts are mainly divided into:
1. be connected to network audio to spread system
1) audio server, the coding realizing 4 road audio signal sources exports.
Step 01: select an embedded audio server being with network interface;
Step 02: open audio server program, the different audio-source in selected 4 tunnels, by standard audio format with the mode of data flow exporting from network interface end from net;
Step 03: by switch, embedded audio server is connected with 8 single-chip microcomputer plates with netting twine;
2. by reception and the forwarding of 8 chip microcontroller data.
1) MCU receives the 4 road voice datas that network sends.
Step 01:MCU1 receives 4 road audio stream signals of automatic network by network chip;
Step 02:MCU1 outputs to corresponding audio decoder chip 2 tunnel audio signals in the audio signal of coming from reception by IIS interface;
Step 03:MCU1 is exported the other 2 tunnel audio signals in the audio signal of coming from reception by serial port protocol;
Step 04:MCU2 receives 2 tunnel audio signals from serial ports;
Step 05:MCU2 outputs to audio decoder chip audio signal by IIS interface.
3. by audio decoder chip, digital signal is converted to analog signal output.
1) realize decoding function, system electrification also carries out D/A signal transacting.
Step 01: receive the digital signal brought by corresponding MCU;
Step 02: signal is carried out DA conversion;
Step 03: left sound and right-channel signals are separated and transmits;
Step 04: export from relevant I/O mouth, to audio drive circuitry, carry out signal amplification, be transported to playback terminal, completes 4 tunnel audio signals and exports.
In the above-described embodiments, as shown in Figure 3, MCU1 and MCU2 all adopts LPC1758 or LM3S9B96 processor chips (adopting LM3S9B96 chip in Fig. 3), audio decoder chip adopts TLV320AIC23 chip, said chip forms complete system to audio server, switch and corresponding network interface, in actual compartment in mounting means, by the system integration in Fig. 1 on one piece of board, its board and audio server, switch can be arranged in a 3U cabinet jointly, save space.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (5)
1. 4 tunnel independent audio output systems based on 8 single-chip microcomputers, comprise audio server, the single-chip microcomputer of audio server is connected by switch and corresponding network interface, and the audio decoder chip of single-chip microcomputer is connected by IIS interface, it is characterized in that, described single-chip microcomputer comprises single-chip microprocessor MCU 1 and the single-chip microprocessor MCU 2 of two 8, described single-chip microprocessor MCU 1 connects audio server by network interface and receives its 4 road audio stream signal, described single-chip microprocessor MCU 1 connects an audio decoder chip by IIS interface and it is exported to 2 tunnels in 4 road audio stream signals, described single-chip microprocessor MCU 1 connects single-chip microprocessor MCU 2 by serial ports and exports remaining 2 tunnels in 4 road audio stream signals by corresponding serial port protocol to it, described single-chip microprocessor MCU 2 connects another audio decoder chip by IIS interface and it is exported to 2 road audio stream signals, two audio decoder chips convert the digital audio stream signal of acquisition to simulated audio signal and respectively by corresponding I/O mouth output audio signal.
2. the 4 tunnel independent audio output systems based on 8 single-chip microcomputers according to claim 1, is characterized in that, the different audio-source in selected 4 tunnels of described audio server, is inputted from network interface end by network port driving in the mode of data flow by standard audio format.
3. the 4 tunnel independent audio output systems based on 8 single-chip microcomputers according to claim 2, it is characterized in that, described standard audio format comprises WAV form, AAC form or WA form.
4. the 4 tunnel independent audio output systems based on 8 single-chip microcomputers according to claim 1, is characterized in that, 2 road audio stream signals are divided into L channel and R channel two-way audio signal independently to export by its DATA sequential by described audio decoder chip.
5. the 4 tunnel independent audio output systems based on 8 single-chip microcomputers according to claim 4, it is characterized in that, described audio decoder chip postorder is connected with audio drive circuitry, carries out signal power amplification and is transported to playback terminal.
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| CN105578347A (en) * | 2015-12-25 | 2016-05-11 | 数源科技股份有限公司 | Audio system of integrated automotive electronic product |
| CN114501296A (en) * | 2022-01-28 | 2022-05-13 | 联想(北京)有限公司 | Audio processing method and vehicle-mounted multimedia equipment |
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Application publication date: 20150506 |