Segmentation method and application of HY420

Single chip microcomputer STM32L151CCU6

Supply 0603 blue LED

The address input AO~A7 of HY420 has a valid value range of OOOOOOOO~10011111. There are 159 values, that is, it can be divided into up to 160 storage units for recording and playing multi-segment voice. AO~A7 determine the starting address of each segment, and the starting address directly reflects the recording and playback time To. The relationship formula is as follows: To = 0.125s × (128A7 + 64A6 + 32A5 + 16A4 + 8A3 + 4A2 + 2A1 + A0).

The figure above is the segmentation application circuit of the HY420. The start address (time) of each segment is set by grounding the address line through a diode. The address line connecting the diode is the address "o", and the address line not connected to the diode is connected to the high level by the pull-up resistor to the address "1". The starting address and time of each segment in Figure 6 are set as follows: 笫 one segment starts from 0 seconds, the address is set to ooooooo; the second segment starts at 2 seconds, the address is set to OO010000; the third segment starts at 5 seconds, and the address is set to The fourth segment of O0100000l starts at 12 seconds and the address is 01010000. In practical application, the reader can set the corresponding AO~A7 combination according to the starting time of each segment. When recording, put S5 in the "REC" position, then press and hold Sl.I, ED will start recording. When the recording time reaches 2 seconds, you must release Sl, otherwise the next paragraph will be invalid. The method of recording other segments is the same as above. When playing the segment, first place S5 in the "PLAY" position, just press the corresponding Sl-S4 button to play the relevant statement.

If the time of the segmentation is fixed and the number of segments is small, the diode code can be omitted, so that the circuit is simpler. For example, it is required to divide into 2 segments, each time is 10 seconds. Just connect A4 and A6 to lOOkΩ pull-up resistor to vCC in Figure 5, and the other address lines are grounded. It is required to be divided into four segments, each time is 5 seconds. Just connect A3 and A5 to pull-up resistor to Vcc in Figure 5, and the other address lines can be grounded to achieve segmentation.

The address line of HY420 can be directly connected with single-chip microcomputer and microcomputer, and realizes the combination of segmented recording and playback and sentence splicing under the micro-processing control mode, and its use is more extensive.