A circuit for controlling the edge waveform of the audio envelope

Abstract

The invention discloses a circuit for controlling an edge waveform of an audio envelope line. The circuit is characterized in that a voltage stabilizing unit generates a stable direct current which is provided to a digital potentiometer unit and a control unit, wherein the digital potentiometer unit is controlled by the control unit, the control unit respectively draws CS ends connected to the digital potentiometer unit to a low level and draws the U / D end of the digital potentiometer unit to a high level, the low and high levels are input to the INC end pulse of the digital potentiometer unit, the input speed and time of the pulse stay the same as an ascending step wave, and after the waveform of an ascending edge is generated, the U / D end connected to the digital potentiometer unit is drawn to the low level which is input to the INC end pulse of the digital potentiometer unit, and the input speed and time of the pulse stay the same as a descending step wave so as to generate the waveform of a descending edge. The circuit disclosed by the invention solves the problem of gradient of ascending and descending edges of a medical alarm audio, so that the envelope waveform of an output audio signal is gentle and smooth and further meets the hearing characteristics of human ears.

Description

technical field [0001] The invention relates to an audio signal envelope production technology, in particular to a circuit for controlling the edge waveform of an audio envelope. Background technique [0002] An industry standard for medical device alarm systems that describes in detail everything from the medical conditions that trigger the audible alarm to the frequency and waveform of the audible alarm. When an alarm occurs on a medical alarm instrument, medical staff expect to be able to infer the urgency, nature, and even cause of the alarm from the sound alarm, so as to take corresponding measures to deal with emergencies. According to the standards, the audio signal is required to have a gradient form, that is, the sound alarm signal is required to have a rising edge and a falling edge. How to make the rising and falling edges of the alarm tone is a problem to be solved. In the prior art, integrated circuit chips (such as DAC conversion chips, etc.) are used to cont...

AI Technical Summary

Problems solved by technology

It effectively solves the problem of the gradient of the rising and falling edge of the medical alarm sound, and makes the output audio signal envelope waveform softer and more delicate, which is more in line with the auditory characteristics of the human ear. It has the advantages of convenient and simple production, low hardware cost, and hardware reuse rate. high feature

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