Voice warning circuit for ground proximity warning system

Abstract

The invention discloses a voice warning circuit for a ground proximity warning system. The circuit is characterized by mainly comprising a main processor, a voice chip, a high-pass filtering circuit, an audio amplifier, a balanced circuit driver, an audio transformer and a connector, wherein the main processor is connected with the voice chip and is continuously connected with the high-pass filtering circuit and the audio amplifier; the audio amplifier is further connected to the balanced circuit driver, is continuously connected to the audio transformer and then is connected to the connector. The voice warning circuit for the ground proximity warning system uses an integrated voice chip, can output audios with the maximum sampling rate of 12 kHz, is clear in voice, high in tone quality, adjustable in sound volume and simple to control, and satisfies the requirement of the ground proximity warning system which outputs various different warning voices. The circuit comprises the functions of filtration, amplification, converting a single-end to differential, impedance matching, isolation and the like, can satisfy the electric requirement of an avionics device on an audio interface, and overcomes the defects in the prior art.

Description

technical field [0001] The invention relates to a voice warning circuit of an earth proximity warning system. Background technique [0002] The ground proximity warning system is a kind of aircraft onboard avionics equipment. Its working principle is to receive various flight state parameters such as geographic location, flight altitude, attitude, heading and speed, and use the built-in terrain database, obstacle database, etc., according to The pre-defined ground proximity warning algorithm requires to make a judgment on whether the aircraft is in a dangerous area. When the aircraft is in danger of colliding with the ground, it will promptly provide the pilot with a combination of voice, light and terrain display warnings to avoid collisions with mountains and ground accidents. Ensure flight safety. According to different dangerous situations, the ground proximity warning system can output more than a dozen different warning voices such as "terrain", "pull up", "don't desc...

AI Technical Summary

Problems solved by technology

This technology has the following deficiencies: [1] The voice signal output by the voice chip from the SP+ and SP- terminals is a Pulse Width Modulation (PWM) signal instead of a voltage signal, and the voltage amplitude cannot be adjusted; [2] The circuit does not It has impedance matching function and filtering function; [3] the voice signal is directly output to the speaker after power amplification, and does not have the function of isolation protection

This technology can play a variety of voices and is flexible in development, but it has the following disadvantages: [1] The circuit does not have impedance matching and filtering functions; [2] The analog audio signal is directly output to the speaker after power amplification, without voltage amplitude Value amplification, and does not have the function of isolation protection

This technology has the following disadvantages: [1] It can only generate a single alarm sound, and cannot output a variety of different voices; [2] it is only a logic control circuit for the alarm sound, which cannot directly generate voice signals, and does not have the interface electrical characteristic matching function

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