Multi-channel output alarm voice circuit of near-earth alarm system

Abstract

The invention relates to a multichannel output alarm voice circuit of a near-earth alarm system, which comprises a main processor U1, an audio codec U2, a pre-amplifier U3, an audio amplifier U4, a balance line driver U5 and an audio transformer T1. The circuit further comprises a high-pass filter circuit A1 which is composed of a filter capacitor C4 and a filter resistor R4 and used for filteringa direct current component and other low-frequency noise of an audio signal output by the voice chip, the first end of the filter capacitor C4 is connected with the pre-amplifier U3, the second end of the filter capacitor C4 and the first end of the filter resistor R4 are connected with the audio amplifier U4, and the second end of the filter resistor R4 is grounded. The advantages of the invention are that the audio signal in the alarm voice circuit has strong anti-interference capability in the transmission process, and has the electrical requirements of voice audio signal amplitude, impedance, isolation, difference and the like between a near-earth alarm system and a built-in interphone.

Description

technical field [0001] The invention relates to a circuit in the field of airborne avionics equipment, in particular to a multi-channel output alarm voice circuit for an earth proximity warning system. Background technique [0002] The ground proximity warning system is an aircraft onboard avionics device that judges whether the aircraft is in a dangerous area. When the aircraft is in danger of hitting the ground, it provides the flight crew with a combination of voice, light and terrain display to avoid hitting the mountain. , Landing accident occurred, to ensure flight safety. According to different dangerous situations, the ground proximity warning system can output more than a dozen different ground proximity warning voices. [0003] The alarm voice of the ground proximity warning system is output through the alarm voice circuit, and the output alarm voice audio signal is sent to the intercom of the left and right drivers and the navigator. The existing ground proximit...

AI Technical Summary

Problems solved by technology

The existing ground proximity alarm voice circuit only outputs one alarm voice, and the alarm voice needs to be recorded in the voice memory chip in advance, which is inconvenient to change in real time; the audio signal in the alarm voice circuit has poor anti-interference ability during transmission, and has no Electrical requirements for voice and audio signal amplitude, impedance, isolation and differential between the ground proximity warning system and the intercom

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