Triggering device and triggering method of SPDIF interface signals

The invention discloses a triggering device of SPDIF interface signals. The triggering device includes an analog comparator, an SPDIF interface decoding module, a memory, a triggering comparison module, a subsequent processing module and a controller; the SPDIF interface signals are converted and are transmitted to the SPDIF interface decoding module through the analog comparator; the SPDIF interface decoding module acquires and judges the sampling rate of audio signals in an SPDIF interface through a high speed clock; the SPDIF interface decoding module transmits all information to the triggering comparison module; the information is compared with a triggering condition; if the information accords with the triggering condition, triggering singles are generated, the information is transmitted to the memory so as to be stored, and at the same time, the information is transmitted to the subsequent processing module; and the controller controls the SPDIF interface decoding module, the memory, the triggering comparison module and the subsequent processing module. Through adopting above technical schemes of the invention, the signals of the SPDIF interface can be acquired and analyzed through a triggering mode customized for the SPDIF interface, and therefore, the analysis and triggering ability of an electronic measuring instrument for the SPDIF interface can be enhanced, and the efficiency of user' debugging of the SPDIF interface can be improved.