Abstract: A fingerprint signal processing system for a fingerprint sensor includes a calibration control circuit, a register circuit, a decode circuit and a normalization circuit. The calibration control circuit is configured to receive a background calibration control signal and an image signal from the fingerprint sensor, and convert the image signal into a plurality of digital signals according to a plurality of offsets. When the background calibration control signal is at a high level, the calibration control circuit is configured to read a plurality of calibration parameters from the register circuit.

Abstract: A fingerprint signal processing system for a fingerprint sensor includes a calibration control circuit, a register circuit, a decode circuit and a normalization circuit. The calibration control circuit is configured to receive a background calibration control signal and an image signal from the fingerprint sensor, and convert the image signal into a plurality of digital signals according to a plurality of offsets. When the background calibration control signal is at a high level, the calibration control circuit is configured to read a plurality of calibration parameters from the register circuit.

Abstract: A fingerprint-encrypting method is used between a fingerprint sensor and a host to perform encryption on a fingerprint datum with a universal encryption standard. The encryption standard of universal specifications is designed to be a physical circuit that is placed in a bridge integrated circuit, so that the encryption process can in terms of duration meet the timeframe provided by the system for fingerprint data transmission and processing.

Abstract: A fingerprint-sensing integrated circuit encrypts fingerprint image data before transmitting the fingerprint image data to a remote system host through a Tx/Rx interface so as to prevent the fingerprint image data from being skimmed, or to prevent verification of a stolen fingerprint image data sent to the system host. The scrambling encryption method does not need an SRAM, a DRAM or a flash memory for design of the encryption circuit, and the data volume remains unchanged after encryption, thereby preventing latency and delay during data encryption/decryption and data transmission.

Abstract: A fingerprint encoding method shows an alphanumeric character or a symbol offered by a system first. Then, users select a desired finger corresponded with the alphanumeric character or symbol to touch the sensor, thereby acquiring a fingerprint image or a fingerprint characteristic value of the finger to save the fingerprint image or the fingerprint characteristic value in a memory area corresponded with the alphanumeric character or the symbol in a memory. A fingerprint authenticating method does not need to set a preset password, while showing a random verification code offered by the system, and users enter the correspondent fingerprints in order according to the random verification code.

Abstract: A decoding apparatus for a high-density recording medium includes a demodulator, a long-distance code (LDC) processing module, a burst indicator subcode (BIS) processing module, an erasure code generator, and a decoder. The demodulator demodulates data from a high-density recording medium to obtain a demodulated data and a demodulation error flag. The LDC processing module and the BIS processing module deinterleave the demodulated data to respectively obtain an LDC data and a BIS data. The erasure code generator sets an erasure flag corresponding to the LDC data according to the demodulation error flag and the BIS error flag. The decoder decodes the LDC data according to the erasure flag. Further, the decoder decodes the BIS data to obtain the BIS error flag.

Abstract: A decoding apparatus for a high-density recording medium includes a demodulator, a long-distance code (LDC) processing module, a burst indicator subcode (BIS) processing module, an erasure code generator, and a decoder. The demodulator demodulates data from a high-density recording medium to obtain a demodulated data and a demodulation error flag. The LDC processing module and the BIS processing module deinterleave the demodulated data to respectively obtain an LDC data and a BIS data. The erasure code generator sets an erasure flag corresponding to the LDC data according to the demodulation error flag and the BIS error flag. The decoder decodes the LDC data according to the erasure flag. Further, the decoder decodes the BIS data to obtain the BIS error flag.

Abstract: A state modulation method and an apparatus for inserting state control codes are provided. To overcome the problems of inefficient control on direct current and low frequency component in conventional state modulation techniques, the disclosed method inserts state control codes in a state modulation method to increase the probability for selection. With multi-level characteristics, the inserted state control codes can provide a plurality of sets of different signals for selection during coding. Thereby, the direct current and low frequency components can be well controlled.

Abstract: A state modulation method and an apparatus for inserting state control codes are provided. To overcome the problems of inefficient control on direct current and low frequency component in conventional state modulation techniques, the disclosed method inserts state control codes in a state modulation method to increase the probability for selection. With multi-level characteristics, the inserted state control codes can provide a plurality of sets of different signals for selection during coding. Thereby, the direct current and low frequency components can be well controlled.