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Airborne real-time voice synchronous transmission system and method based on cascade switches

A technology of synchronous transmission and real-time voice, applied in transmission systems, digital transmission systems, time-division multiplexing systems, etc., can solve problems such as the synchronization problem of cabin equipment, and achieve the effect of easy maintenance and strong anti-interference ability.

Pending Publication Date: 2022-03-04
CETC AVIONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But at the same time, digital audio technology also exposes defects in real-time transmission and synchronization. Due to the accumulation of sampling clock errors, the synchronization problem between cabin equipment appears.

Method used

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  • Airborne real-time voice synchronous transmission system and method based on cascade switches
  • Airborne real-time voice synchronous transmission system and method based on cascade switches

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] This embodiment provides an airborne real-time voice synchronous transmission system based on cascaded switches, such as figure 1 As shown, it includes: Ethernet, a sending part and a receiving part; the sending part includes a first cascaded switch, and the receiving part includes a second cascaded switch;

[0048] The sending part encapsulates audio data and clock synchronization information into Ethernet data packets and sends them to Ethernet through the first cascaded switch;

[0049] The receiving end part receives the Ethernet data packet from the Ethernet through the second cascade switch;

[0050] The receiving end part analyzes the Ethernet data packet, calculates the clock deviation based on the clock synchronization information, and adjusts it based on the clock deviation

[0051] The local reference clock is used to reconstruct the local media clock, so that the receiving part and the sending part use the same audio media clock to work.

[0052] The sending...

Embodiment 2

[0068] This embodiment provides an airborne real-time voice synchronous transmission method based on cascaded switches, which is applied to the airborne real-time voice synchronous transmission system of the previous embodiment, including steps:

[0069] S1. The sending part encapsulates the audio data and clock synchronization information into Ethernet data packets and sends them to Ethernet;

[0070] S2. The receiving part receives the Ethernet data packet from the Ethernet;

[0071] S3. The receiving part analyzes the Ethernet data packet, calculates the clock deviation based on the clock synchronization information, adjusts the local reference clock based on the clock deviation and reconstructs the local media clock, so that the receiving part and the sending part use the same audio media clock to work.

[0072] The sending part includes: a first cascaded switch, a first crystal oscillator, a first processor and a pickup module;

[0073] The first crystal oscillator provi...

Embodiment 3

[0081] This embodiment will be described in more detail with reference to the relevant drawings. Such as figure 2 As shown, (the solid line in the figure is the clock signal transmission direction, and the dotted line is the data signal transmission direction) the realization of the real-time voice synchronization transmission process is described in detail as follows:

[0082] The clock signal of the sending part: the sending part operates as the master clock role of the PTP clock synchronization domain, and the high-precision first crystal oscillator provides the same source master clock (first clock synchronization information) for the first processor and the first cascaded switch, so that All modules of the sending end part work in the same clock domain (S101).

[0083] The first processor, as the master clock role of the PTP clock synchronization domain, periodically sends and receives clock synchronization messages (S102) through the first cascaded switch, and modifies...

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Abstract

The invention discloses an airborne real-time voice synchronous transmission system and method based on cascade switches, and the method comprises the steps: enabling a transmitting end part to convert an analog audio into an Ethernet data packet, and enabling a receiving end part to convert the Ethernet data packet into an analog audio signal, and enabling the analog audio signal to be played; the transmission of PTP clock synchronization information is completed while audio signals are transmitted, a receiving end calculates clock skew through interactive clock information, so that a local reference clock is adjusted by using the skew value, a local media clock is reconstructed, finally, the receiving end and the transmitting end work by using the same audio media clock, and audio synchronous transmission is realized.

Description

technical field [0001] The invention relates to the technical field of airborne equipment network, in particular to an airborne real-time voice synchronous transmission system and method based on a cascade switch. Background technique [0002] With the development of information technology and the continuous expansion of business needs, more and more audio and video equipment are used in the aircraft cabin, and the demand for real-time audio and video transmission based on airborne equipment is becoming more and more urgent. [0003] In traditional analog audio transmission, each signal corresponds to a physical line, and the wiring and maintenance costs are doubled. The poor anti-interference ability of analog signal long-distance transmission leads to serious signal quality attenuation. With the development of network technology, the system has gradually been replaced by a new generation of digital audio transmission technology. Digital audio technology occupies a dominan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04J3/06H04L7/00
CPCH04J3/0638H04J3/0667H04L7/0016
Inventor 李岩王瑞
Owner CETC AVIONICS