3 results about "Excitation signal" patented technology

The invention discloses an analog circuit for detecting the wire breaking of a displacement sensor LVDT, which comprises a displacement sensor LVDT, wherein a primary coil of the displacement sensor LVDT is connected with an excitation signal source. The analog circuit for detecting the wire breaking of the displacement sensor LVDT is characterized in that the output ends of the secondary coils of the displacement sensor LVDT are respectively connected with a test signal and are respectively connected with a multi-channel selection switch through a filter and rectifier circuit, and predetermined different groups and combinations of wire breaking voltages which are output when an LVDT is disconnected are simultaneously connected with the multi-channel selection switch; the two output end voltages of the secondary coils of the LVDT are respectively combined with a group of comparison voltages to be connected with each comparator, and each comparator is connected with the output control end of the multi-channel selection switch through an arithmetic logic OR unit, and the multi-channel selection switch is simultaneously connected with a servo amplifier. The invention can directly achieve the detection of wire breaking state only by a hardware circuit, and the method is simple and reliable.

The invention provides a printed circuit board element for forming an enhancement mode biosensing module and a fabrication method for the printed circuit board element. The printed circuit board element comprises a printed circuit board, a biosensing chip and a protection layer, wherein the printed circuit board comprises an insulating layer and a conductive layer; the conductive layer forms a working circuit, an excitation circuit, multiple first connecting point welding pads and multiple second connecting point welding pads on a part of the upper surface of the insulating layer, wherein the second connecting point welding pads are connected to the excitation circuit; the biosensing chip is assembled on the printed circuit board; the biosensing chip comprises a sensing region, an excitation signal source, multiple combination welding pads and multiple conductive elements; each combination welding pad is electrically connected to the corresponding first connecting point welding pad; the excitation signal source is connected to the excitation circuit through the combination welding pads and used for providing an excitation signal; each conductive element is assembled on the corresponding second connecting point welding pad; and the protection layer is formed on and covers the printed circuit board, the biosensing chip and the conductive elements. According to the printed circuit board element, cracking of the protection layer can be avoided by virtue of the light and thin dimensions of the conductive elements.

The invention discloses a speech synthesis method capable of being used for a chip end. The speech synthesis method comprises the following steps: step 1, calculating a pulse excitation seed signal and a noise excitation seed signal; step 2, solving an excitation signal according to the fundamental frequency F0 of the given voice and the band-shaped aperiodic ratio ap; and step 3, for each frame of frequency spectrum envelope of the given audio, calculating corresponding audio data, and then performing superposition according to frame shift to obtain a final voice waveform. According to the method, the required pulse excitation seed signal is calculated off line in advance, only multiplication and addition operation is performed when periodic excitation and non-periodic excitation are calculated, Fourier transform and inverse Fourier transform are not involved, and the operation speed of the vocoder at a chip end is increased.