摘要:
An Audio Codec which comprises a power selecting circuit an audio compiler circuit and a control amplifier circuit. The power selecting circuit receives at least a primary power source and an auxiliary power source and outputs a working power selected from the power sources. The auxiliary power source is selected and output to the control amplifier circuit only when the computer is at a power-off status. When the computer is power-on, the primary power source will be selected and output to both the audio compiler circuit and the control amplifier circuit. Therefore, the Audio Codec of the present invention only needs one set of internally furnished control amplifier circuit to both operate on the normal power-on status and perform the Power OFF CD function.
摘要:
An apparatus and method of automatic identification an external audio input/output device. The external device connected to an audio jack is identified as an audio output or input device, according to the impedance thereof. Furthermore, the present invention automatically selects the most suitable internal circuit to connect to the external device.
摘要:
An audio converting device including a digital high-pass filter, an expander, a digital low-pass filter, a delta-sigma modulator, a digital-to-analog converter, an analog low-pass filter and a gain control unit is provided. The digital high-pass filter in this invention can filter out a direct-current component of digital audio data such that the production of noise is avoided when the volume is adjusted by users.
摘要:
The present invention offers an over-sampling digital-to-analog converter with variable sampling frequencies to process input signals of variable sampling frequencies. The over-sampling digital-to-analog converter comprises an expander, which expands said input signals with a fixed rate of M to produce over-sampling signals; a digital low-pass filter, which filters out high-frequency ingredients of over-sampling signals and then outputs data with a first rate; a data buffer, which receives the outputted data by said digital low-pass filter with the first rate and outputs the data with a second rate; a modulator, which reads data in said data buffer with the second rate and modulates the data; a digital-to-analog converter, which converts the modulated data to analog signals; and an analog low-pass filter, which filters out high-frequency ingredients of said analog signals for producing output signals. No matter how the sampling frequency of the input signals is, due to reading rates of the modulator are the same, the over-sampling digital-to-analog converter ensures that noise is mostly distributed in the high-frequency band.
摘要:
A switching mechanism for a camera includes: a control unit; a driving device coupled with and actuated by the control unit; a first gear set coupled with the driving device; a second gear coupled with the first gear set and centrally provided with a rotary shaft having a shaft hole formed with threads; a spindle being female-connected to the shaft hole and which has an axial surface formed with outer threads corresponding to the threads of the shaft hole, thus allowing the second gear to move along and relative to the spindle; and a translation member positioned perpendicular to the spindle and provided with a rack for engaging with the second gear and thus driving the translation member to move perpendicular to the spindle. The second gear drives or does not drive the rack as the engagement therebetween is made or broken.
摘要:
The present invention discloses a watertight monitoring device and comprises: fixing frame, a watertight cover, an image-capturing module, an upper cover, at least an adjustment tab, at least a plastic film, a front cover, and a rear cover; wherein the fixing frame has an outer surface provided with a recess having at least a through hole, the plastic film having an end coupled with the bottom edge of the adjustment tab and an opposite end passing sequentially through the aperture of the watertight cover and the through hole of the recess on the outer surface of the fixing frame and coupled with the adjustment rod of the image-capturing module, wherein the projecting portion of the adjustment tab can be pushed along the outer surface of the monitoring device so that the adjustment tab is moved in the arc direction, and the plastic film thus driving the adjustment rod of the image-capturing module so as to adjust functions of the image-capturing module.
摘要:
A signal processing system for changing a level of an input signal to generate an output signal is disclosed. The signal processing system includes a shifter, a sigma-delta modulator, and a level adjuster. The shifter is utilized for receiving the input signal and for bit-shifting the input signal according to a first predetermined gain to generate a first adjustment signal. The sigma-delta modulator is utilized for generating the output signal according a second adjustment signal and the first adjustment. The level adjuster is utilized for adjusting a level of the output signal according to a second predetermined gain to generate the second adjustment signal.
摘要:
A pipeline ADC for converting an analog input signal to a digital output signal includes: a plurality of analog-to-digital converting units cascading in series to form a pipeline including a plurality of digital output ends; a calculation unit coupled to the analog-to-digital converting units for generating a plurality of calibration parameters in a first mode according to signals at the digital output ends; and a calibration unit coupled to the calculation unit and the analog-to-digital converting units for calibrating signals at the digital output ends in a second mode according to the calibration parameters, so as to generate the digital output signal.
摘要:
A switching mechanism for a camera device includes a driving device, a first screw bar connecting to the driving device, a second screw bar connecting to the first screw bar, and a lead screw having an end coupled with the second screw bar. The first screw bar is driven by the driving device via a screw thread thereof, and the second screw bar is driven by the first screw bar via a screw thread thereof, thereby driving the lead screw for rotation. The screw nut is disposed on the lead screw and moved back and forth via the rotation of the lead screw. Two stop blocks disposed at two ends of the lead screw respectively are to limit two positions of the moved screw nut while the screw nut is moved beyond a threaded area of the lead screw, upon which time the screw nut is slightly engaged with the lead screw.
摘要:
A switching mechanism for a video camera includes: a control unit; a driving device connected with and controlled by the control unit; a first belt pulley connected with the driving device; a second belt pulley smaller than the first belt pulley in diameter; a belt looped around the first and second belt pulleys for power transmission, and including a first protuberance; a translation member provided with a second protuberance so that through a loose fitting connection between the two protuberances, the translation member is driven to move; and a positioning element having a positioning plane, at least two inclines, and at least two top surfaces, wherein the positioning plane and the at least two inclines are designed to contact the second protuberance of the translation member alternately so as to restrict and reposition the translation member.