What are the characteristics of elevator voice station announcement system?

Elevator is an important mechanical and electrical equipment in high-rise buildings. Modern intelligent buildings not only require elevators to deliver passengers to their destinations safely and smoothly, but also should be able to predict floor stops, insert advertisements and specific floor stop descriptions, such as "Welcome to XX Hotel", "Third Floor, Western Restaurant" and so on. At present, most elevators produced by elevator manufacturers are not equipped with automatic voice station announcement system. Therefore, it is necessary to develop a universal automatic voice station announcement system, which can be used for all kinds of elevators and can be recorded and played at will. APR9600 voice recording and playback chip is a new voice chip, which has good sound quality, low noise, is not afraid of power failure, and can be recorded and played repeatedly. Single chip can record 60 seconds, serial control can be divided into 256 segments, and parallel control can be divided into 8 segments. When recording, external audio signals enter through microphone input or line input. The microphone can be an ordinary electret microphone, and the on-chip microphone amplifier has its own automatic gain adjustment. The response speed and gain range can be set by an external resistor container. After the audio signal is processed by internal filtering and sampling circuit, it is stored in the special flash memory FLASHRAM in an analog way. Because FLASHRAM is a non-volatile device, the stored voice will not be lost due to power failure and other factors. When playing, the on-chip reading logic circuit takes out the signal from FLASHRAM, sends it to the power amplifier through a low-pass filter, and then directly pushes it to an external speaker for playing. The external speaker can be 8 ~ 16 ohm, and the output power is 12.2 MW (16 ohm) at general volume. APR9600 mainly has two recording and playback control modes: serial control and parallel control, which are realized by setting three ports of the chip, MSEL 1, MSL2 and /M8. In the serial control mode, the fast-forward speed is slow, and it can only be played forward in sequence, but not backward in sequence, so the serial control mode is not suitable for elevator automatic stop reporting. The voice station reporting system adopts parallel control mode. When the floor is high, one 89C205 1 single chip microcomputer can control two APR9600, and press "1 ~ 9", "10", "20" and "30" to record, and through simple combination, use 16544.