CN1243459C - High-fidelity audio transmitting device - Google Patents
High-fidelity audio transmitting device Download PDFInfo
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- CN1243459C CN1243459C CN 200310100131 CN200310100131A CN1243459C CN 1243459 C CN1243459 C CN 1243459C CN 200310100131 CN200310100131 CN 200310100131 CN 200310100131 A CN200310100131 A CN 200310100131A CN 1243459 C CN1243459 C CN 1243459C
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Abstract
The present invention relates to a high-fidelity audio transmission device composed of an optical fiber transmission part, a frame controlled tray and a high-fidelity audio interface tray. The sampling frequency is 16K or 32K which can be adjusted by a special stereo audio analog/digital and digital/analog conversion chip and a 16-bit five-time delta sigma mode code in two modes of software or hardware, the separation of stereo signals and the insertion of time slots of standard E1 signals are completed by designing a field programmable gate array, the transmission of audio signals is completed through an E1 interface, and the width of audio bands can reach 8K or 16K through abundant audio signals transmitted by the high-fidelity audio transmission device with selectable monophony and stereophony. The present invention is practically used for the transmission of musical signals.
Description
Technical field
The present invention relates to a kind of HD Audio transmission equipment, relate in particular to HD Audio data acquisition and coding/decoding apparatus that the optical communication Access Network adopts.
Background technology
Traditional audio user loop transmission equipment, audio frequency adopt 8 a rule or u rule coding, and sample frequency is 8K, and audio bandwidth is 200Hz-3.4KHz, and such audio bandwidth can only satisfy common voice call.For example, at publication number is that CN1408158A, denomination of invention are mentioned for the application for a patent for invention specification of " messaging delivery services that is used for Digital Subscriber Loop ", provide messaging delivery services by Digital Subscriber Loop such as voice service, the voice data coding is inserted in the time slot, by transmission, decoding is reduced into voice data again.
ITU G.703 file (No. 703 file of the committee of International Telecommunications Union) describes the time-division multiplexing (TDM) implementation method, time is divided into isometric timeslice, usually represent with a frame, one frame is 125us, per 16 frames are a multi-frame, and each frame is divided into 32 time slots, is followed successively by TS0, TS1, TS2 ... TS31.Wherein TS0 is a synchronization slot, and TS16 is the signalling time slot, and other 30 is data slot.
Adopt time-division multiplexing (TDM) can realize remote speech channel transmission, synchronous 64K path, asynchronous transparent path, E/M signaling, 2/4 line path, magnetite interface.
Above technology all is that digital coding is inserted in the time slot, and by transmission, decoding is reduced into original data again.Its shortcoming is: it is the common speech transmissions of 200Hz-3.4KHz that audio bandwidth is provided in the speech business that provides, and the transmission of the stereosonic music signal of high-quality, high bandwidth can not be provided.
Summary of the invention
The object of the invention provides a kind of transmission equipment that can transmit Hi-Fi audio signal, with solve in the traditional voice transmission equipment speech bandwidth not enough, do not have a stereosonic problem, by webmaster control can realize flexibly that bandwidth is adjustable, point-to-point transmission, a bit to transmission of the broadcast type of multiple spot.
A kind of HD Audio transmission equipment of the present invention comprises Optical Fiber Transmission part, frame controlled tray and high-fidelity interface disc, and frame controlled tray becomes frame module to form by time slot Cross module, professional control and administration module, webmaster communication processing module, power module and E1 mouth; The HD Audio interface disc is by analog/digital, numeral, the stereo audio signal separation module, E1 time slot synthesis module, microprocessor, the hardware controls switch, composition such as power supply and serial communication interface, it is characterized in that: analog/digital wherein, numeral sends the audio frequency input conversion digital signal of the left and right sides channel stereo audio signal separation module to and will be converted to the audio signal that left and right sides channel is exported from the digital signal of three-dimensional sound audio signals separation module, select to use 16K or 32K sample frequency by hardware controls switch or microprocessor software, the corresponding audio transmission bandwidth is 8K or 16K; Stereo audio signal separation module wherein and E1 time slot synthesis module have adopted special-purpose field programmable gate array hardware designs, left and right sides stereophonic signal can be separated, independently insert the different time slot of E1 mouth, make the audio interface of high-fidelity, promptly can use, also can be used as two single channels and independently use as a stereosonic passage.
Below explain in detail operation principle of the present invention.
The present invention is by adopting special-purpose stereo audio analog/digital and digital-to-analog conversion chip, 5 Δ ∑ modes of 16 are encoded, and control by microprocessor software in the HD Audio interface disc or hardware controls switch dual mode, the sample frequency that makes analog/digital and digital-to-analog conversion chip is that 16K or 32K are adjustable, finish the separation of stereophonic signal and the time slot of the standard of insertion E1 signal by the field programmable gate array design, finish transmission of audio signals by the E1 mouth, audio signal by the transmission of HD Audio transmission equipment is abundant, audio bandwidth can reach 8K or 16K, monophony and stereo channel are optional, are useful for the transmission of music signal.
Implementation procedure of the present invention is by the HD Audio interface disc audio signal to be carried out analog/digital conversion, finish the conversion of audio frequency to the TTL digital signal, the TTL digital signal is inserted in the time slot of E1 mouth by field programmable gate array (FPGA) again, and by frame controlled tray to time slot intersect, framing, deliver to the opposite end by transmission equipment, frame controlled tray by the opposite end extracts the digital signal in the time slot of E1 mouth, and by the digital-to-analog conversion, sends true audio signal.
The present invention adopts audio signal analog-to-digital conversion, data interface techniques, Computer Analysis treatment technology, digital encoding and decoding technique, become E1 (No. 1 standard of european telecommunication) the signal frame forming tech of standard, E1 transmission channel by standard transmits, for example equipment such as PDH (Pseudo-synchronous Digital Hierarchy) (PDH) equipment, synchronous digital hierarchy (SDH) equipment, spread spectrum device, satellite communication are finished the transmission of Hi-Fi audio signal.
The present invention remedied narrow bandwidth in traditional audio signal transmission, no stereo, can only point-to-point shortcoming, increased that webmaster control can realize flexibly that bandwidth is adjustable, point-to-point transmission, a bit to transmission of the broadcast type of multiple spot.Can be used for the transmission of the music broadcast system of departments such as railway, traffic, be specially adapted to urban light rail engineering broadcast communication system;
Description of drawings
Fig. 1 is the schematic diagram of HD Audio transmission equipment structure of the present invention;
Fig. 2 is the topology diagram that HD Audio transmission equipment of the present invention carries out chain networking;
Fig. 3 is the topology diagram that HD Audio transmission equipment of the present invention carries out star-like networking.
Embodiment
Describe embodiments of the invention in detail below in conjunction with accompanying drawing.
Among the HD Audio transmission equipment embodiment as shown in Figure 1, the stereophony audio signal that is divided into left and right sides channel is transmitted to the D/A switch module and is converted into the TTL digital signal, this digital signal is transmitted to stereo audio signal separation module and E1 time slot synthesis module that has adopted field programmable gate array and the time multiplexing signal that forms 2.048Mb/s, this signal transmits by fibre optic transmission equipment will meet the E1 standard digital signals further by time slot Cross module in the frame controlled tray and E1 framing resume module.
By the hardware controls switch in the HD Audio interface disc or by two kinds of patterns of microprocessor programming Control in the interface disc audio signal is carried out audio interface outer shroud, 2.048Mb/s mouth inner and outer ring and the operation of cancellation loopback.The audio interface outer shroud with the time multiplexing signal of 2.048Mb/s at local loopback, to detect the effect that D/A, mould/number conversion and stereophonic signal separate.The effect that 2.048Mb/s mouthful inner and outer ring can be used to detect D/A, mould/number conversion, stereophonic signal separates and the time-division is multiplexing and decompose.
Microprocessor in frame controlled tray adopts MPC850 type microprocessor, control by webmaster, can carry out point-to-point high-fidelity sound transmission, also can adopt communication link protection mode shown in Figure 2 or star-like networking mode shown in Figure 3, realize a bit arriving the transmission of the broadcast type of multiple spot.
In the HD Audio transmission equipment of present embodiment, the model that has adopted TI company in the analog-to-digital converting module is PCM1801 audio frequency mould/number chip, the model that has adopted TI company in the numeral is PCM1725 audio frequency mould/number chip, time slot Cross module employing model in the frame controlled tray is the time slot intersection that the chip of MT8986 is finished Hi-Fi audio signal, and the E1 mouth in the frame controlled tray becomes frame module to adopt model to finish the E1 mouth framing of audio signal for the DS21554/2155 framing chip.
Claims (7)
1. a HD Audio transmission equipment comprises Optical Fiber Transmission part, frame controlled tray and HD Audio interface disc,
Frame controlled tray becomes frame module to form by time slot Cross module, professional control and administration module, webmaster communication processing module, power module and E1 mouth;
The HD Audio interface disc is made up of analog/digital, numeral, stereo audio signal separation module, E1 time slot synthesis module, microprocessor, hardware controls switch, power supply and serial communication interface etc., it is characterized in that:
Wherein by hardware controls switch or microprocessor software to analog/digital, numeral is controlled, make analog/digital, numeral selects to use 16K or 32K sample frequency, the audio input signal of left and right sides channel is converted to the audio signal that digital signal sends the stereo audio signal separation module to and will be converted to left and right sides channel output from the digital signal of three-dimensional sound audio signals separation module, corresponding above-mentioned two kinds of sample frequencys, analog/digital, the input of numeral, the audio signal transmission bandwidth of output is 8K or 16K;
Stereo audio signal separation module wherein and E1 time slot synthesis module have adopted special-purpose field programmable gate array hardware designs, separate by the stereophonic signal of stereo audio signal separation module left and right sound channels, export to E1 time slot synthesis module, the different time slot that the stereophonic signal of left and right sound channels is independently inserted the E1 mouth respectively by E1 time slot synthesis module forms the time multiplexing signal of 2.048Mb/s, make the audio interface of high-fidelity, promptly can use, also can be used as two single channels and independently use as a stereosonic passage.
2. according to the described a kind of HD Audio transmission equipment of claim 1, it is characterized in that audio signal being carried out audio interface outer shroud, 2.048Mb/s mouth inner and outer ring and the operation of cancellation loopback by the hardware controls switch in the HD Audio interface disc and two kinds of patterns of microprocessor software.
3. according to the described a kind of HD Audio transmission equipment of claim 1, it is characterized in that the microprocessor in frame controlled tray adopts MPC850 type microprocessor, control by webmaster, can carry out point-to-point high-fidelity sound transmission, also can adopt star or communication link protection mode, realize a bit arriving the transmission of the broadcast type of multiple spot.
4. according to the described a kind of HD Audio transmission equipment of claim 1, the model that it is characterized in that adopting in the analog-to-digital converting module TI company is PCM1801 audio frequency mould/number chip.
5. according to the described a kind of HD Audio transmission equipment of claim 1, the model that it is characterized in that adopting in the numeral TI company is PCM1725 audio frequency mould/number chip.
6. according to the described a kind of HD Audio transmission equipment of claim 1, it is characterized in that it is that the time slot that the chip of MT8986 is finished Hi-Fi audio signal intersects that time slot Cross module in the frame controlled tray adopts model.
7. according to the described a kind of HD Audio transmission equipment of claim 1, it is characterized in that the E1 mouth in the frame controlled tray becomes frame module to adopt model to finish the E1 mouth framing of audio signal for the DS21554/2155 framing chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200310100131 CN1243459C (en) | 2003-10-10 | 2003-10-10 | High-fidelity audio transmitting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200310100131 CN1243459C (en) | 2003-10-10 | 2003-10-10 | High-fidelity audio transmitting device |
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| Publication Number | Publication Date |
|---|---|
| CN1529533A CN1529533A (en) | 2004-09-15 |
| CN1243459C true CN1243459C (en) | 2006-02-22 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 200310100131 Expired - Fee Related CN1243459C (en) | 2003-10-10 | 2003-10-10 | High-fidelity audio transmitting device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN100470525C (en) * | 2007-03-07 | 2009-03-18 | 威盛电子股份有限公司 | Control device for direct memory access and method for controlling transmission thereof |
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| CN1529533A (en) | 2004-09-15 |
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