Abstract: Disclosed are a two-stage audio gain circuit based on analog-to-digital conversion and an audio terminal. The two-stage audio gain circuit includes a PGA configured to receive an analog audio signal and perform programmable gain amplification processing on the received analog audio signal; an ADC configured to convert the analog audio signal after the programmable gain amplification processing into a digital audio signal and output the digital audio signal; a first AGC gain unit configured to perform a first AGC processing on the digital audio signal and output a first gain adjustment value to the PGA, for the PGA to perform gain adjustment on the received analog audio signal; and a second AGC gain unit configured to perform a second AGC processing on the digital audio signal and output a second gain adjustment value to the PGA, for the PGA to perform gain adjustment on the received analog audio signal.

Abstract: A method for multi-target multi-camera tracking includes: performing multi-target tracking on a video captured by each of multiple cameras, to extract a tracklet for each target appearing in the video, wherein multiple tracklets for multiple targets are extracted on the basis of multiple videos; extracting a feature for each tracklet; determining orientation of each tracklet based on orientation of the target relative to the camera; dividing the multiple tracklets into multiple groups based on the determined orientations; performing clustering on tracklets in each group based on the extracted features, such that tracklets corresponding to the same target are aggregated into an initial set; performing merging among initial sets obtained by performing clustering on respective groups, such that tracklets corresponding to the same target and having different orientations are merged into a final set; and using the tracklets in the final set as tracking information for the corresponding target.

Abstract: The disclosure relates to a method, device and storage medium for processing a target track. According to an embodiment, the method comprises: determining a candidate customer track set of a receipt data group corresponding to one of a plurality of shopping receipts; counting, for each track, the number of sold items matching the track in location in a sold item set indicated by the receipt data group, as a first location matching count of the track; counting, for each track, the number of sold items matching track points of interest in a set of track points of interest of the track in location in the sold item set, as a second location matching count of the track; and determining a customer track corresponding to the receipt data group based on first location matching counts and second location matching counts of a plurality of tracks in the candidate customer track set.

Abstract: Disclosed are a two-stage audio gain circuit based on analog-to-digital conversion and an audio terminal. The two-stage audio gain circuit includes a PGA configured to receive an analog audio signal and perform programmable gain amplification processing on the received analog audio signal; an ADC configured to convert the analog audio signal after the programmable gain amplification processing into a digital audio signal and output the digital audio signal; a first AGC gain unit configured to perform a first AGC processing on the digital audio signal and output a first gain adjustment value to the PGA, for the PGA to perform gain adjustment on the received analog audio signal; and a second AGC gain unit configured to perform a second AGC processing on the digital audio signal and output a second gain adjustment value to the PGA, for the PGA to perform gain adjustment on the received analog audio signal.

Abstract: Disclosed are an audio rate conversion system and an electronic apparatus. The audio rate conversion system includes an integrator-comb filter, a multi-rate filter and a first half-band filter, an input of the integrator-comb filter being accessed with digital audio data, an output of the integrator-comb filter being sequentially connected to the multi-rate filter and the first half-band filter; where, the integrator-comb filter is configured to reduce a rate of the digital audio data according to a preset decimation rate; the multi-rate filter is configured to convert a rate of digital audio data output by the integrator-comb filter into a rate of digital audio data corresponding to an accessed control signal according to the control signal; and the first half-band filter is configured to reduce a rate of digital audio data output by the multi-rate filter.

Abstract: The present disclosure provides a signal calibration method, apparatus and device generated based on an imbalance of I path and Q path. The method includes sending a cosine signal and a sine signal through a signal generator, transmitting the cosine signal and the sine signal in the I path and the Q path respectively, the cosine signal and the sine signal being configured to loop back to a signal receiving direction after passing through a transmitting amplifier; processing a signal obtained by a down converter in the signal receiving direction; performing a phase adjustment and an amplitude adjustment by adjusting the signal generator, gain amplifiers of I path and Q path analog domains, and a corresponding digital domain, so as to determine an appropriate phase cancellation value and an appropriate amplitude cancellation value for an image signal; and calibrating the image signal corresponding to the signal to be calibrated.

Abstract: The present application discloses a filtering method and a filtering device of a filter, a filter and a storage medium. The method includes: obtaining a clock input signal and a clock output signal and comparing them, and determining a phase relationship between the clock input signal and the clock output signal according to a comparison result; determining a decimal deviation factor according to the phase relationship in determining that the phase relationship meets a preset condition; and filtering a sample input signal according to the decimal deviation factor to obtain a filtered sample output signal. The present application can obtain an accurate decimal deviation factor, by obtaining the phase relationship between the clock input signal and the clock output signal, in determining that the phase relationship meets a preset condition, and can adjust the sample input signal according to the decimal deviation factor to obtain a smooth sample output signal.

Abstract: The present disclosure provides a method for compensating an imbalance between an I path and a Q path of a receiver. The method includes: sending a cosine signal and a sine signal through a signal generator, transmitting the cosine signal and the sine signal in the I path and Q path respectively; calculating autocorrelation values of the I path and the Q path in the signal receiving direction; determining a comparison result of amplitudes of the cosine signal received by the I path and the sine signal received by the Q path according to the autocorrelation values; calculating an adjustment compensation value of an analog domain gain amplifier, and an amplitude value and a phase value in a digital domain according to the comparison result of amplitudes; and compensating and adjusting the signal according to the adjustment compensation value, the amplitude value and the phase value.

Abstract: The present disclosure provides a signal calibration method, apparatus and device generated based on an imbalance of I path and Q path. The method includes sending a cosine signal and a sine signal through a signal generator, transmitting the cosine signal and the sine signal in the I path and the Q path respectively, the cosine signal and the sine signal being configured to loop back to a signal receiving direction after passing through a transmitting amplifier; processing a signal obtained by a down converter in the signal receiving direction; performing a phase adjustment and an amplitude adjustment by adjusting the signal generator, gain amplifiers of I path and Q path analog domains, and a corresponding digital domain, so as to determine an appropriate phase cancellation value and an appropriate amplitude cancellation value for an image signal; and calibrating the image signal corresponding to the signal to be calibrated.

Abstract: The present disclosure provides a method for compensating an imbalance between an I path and a Q path of a receiver. The method includes: sending a cosine signal and a sine signal through a signal generator, transmitting the cosine signal and the sine signal in the I path and Q path respectively; calculating autocorrelation values of the I path and the Q path in the signal receiving direction; determining a comparison result of amplitudes of the cosine signal received by the I path and the sine signal received by the Q path according to the autocorrelation values; calculating an adjustment compensation value of an analog domain gain amplifier, and an amplitude value and a phase value in a digital domain according to the comparison result of amplitudes; and compensating and adjusting the signal according to the adjustment compensation value, the amplitude value and the phase value.