Wall-mounted loud-speaking talkback terminal and loud-speaking talkback system

Abstract

The embodiment of the invention provides a wall-mounted loud-speaking talkback terminal and a loud-speaking talkback system. A hardware circuit board of the wall-mounted loud-speaking talkback terminal comprises a power supply board, an audio signal processing power amplifying board and a digital board, wherein the power supply board comprises two paths of isolated power supplies; the audio signal processing power amplifying board is connected with the power supply board through two paths of power supply input / output interfaces; and the digital board is used for supplying power to the audio signal power processing amplifying board through connection with the other path of power supply input / output interface on the audio signal processing power amplifying board, and is connected with the audio signal processing amplifying board through the audio signal input / output interface and a control configuration interface. According to the wall-mounted loud-speaking talkback terminal provided by the embodiment of the invention, power supply-ground partition is performed on each path of audio signal, so that mutual interference among different paths of sound sources and power supply-ground superposition can be reduced, and the signal to noise ratios of the audio signals are effectively increased.

Description

technical field [0001] The embodiment of the present invention relates to a sound reinforcement intercom technology, in particular to a wall-mounted sound reinforcement intercom terminal and a sound reinforcement intercom system. Background technique [0002] Voice intercom is one of the necessary functions in enterprise security systems. With the continuous improvement of technology, voice intercom also plays an increasingly important role in the entire security system, and is widely used in education, electricity, banks, Chemical industry, metallurgy, wharf and other workplaces that need to amplify and call the walkie-talkie. [0003] The wall-mounted amplified intercom terminal is the most commonly used amplified intercom terminal equipment in the education system (such as the application in the listening test), usually with network, local, wireless audio and other amplified and network intercom functions. At present, the wall-mounted PA intercom terminals mainly have th...

AI Technical Summary

Problems solved by technology

[0004] (1) When playing network audio, there will usually be sound jams or interruptions due to poor network quality or high bit rate songs;

[0005] (2) When local audio, network audio and wireless audio are mixed, the output noise of the power amplifier is too large, resulting in poor mixing quality;

[0006] (3) The signal-to-noise ratio of wireless sound reinforcement is low and it is prone to howling;

[0007] (4) Echo phenomenon occurs due to network delay and codec delay during network intercom

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