摘要:
The present invention relates to a method and a device for detecting the type of wobble on an optical recording medium. According to the invention, a programmable digitally tuned oscillator is provided for detecting the wobble at different frequencies and the wobble signal is converted to the base band. Favorably the consistency of the phase of the wobble together with the amplitude of the wobble is used for verifying the presence of the wobble. For this purpose a Cartesian to Polar converter is provided.
摘要:
The invention relates to a method for converting a digital signal an analogue signal and to a digital to analogue converter comprising means for converting a digital signal to a thermometer coded signal, means for randomizing the thermometer coded signal, means for controlling the means for randomizing based on the digital signal and means for converting the randomized signal to analogue.
摘要:
A circuit for correction of deflection errors in a television set, in which a correction current having alternate forward-sweep and flyback periods is supplied to a correction coil for an error parameter. An amplitude of the correction current is reduced during a time window which corresponds to the flyback period and in which no visible picture is displayed.
摘要:
Control circuit for producing output voltages from a plurality of sensor signals, wherein each of the sensor signals are identical and mutually phase shifted. The control circuit comprises a plurality of comparators for producing the output voltages, wherein each comparator is respectively supplied with one of the sensor signals and with an amount of hysteresis which depends on the amplitude of one or more of the respective other sensor signals. The control circuit further comprises electronic circuitry for deriving the respective amount of comparator hysteresis for each of the comparators from the amplitude of one or more of the respective other sensor signals.
摘要:
Image sensor, which comprises a plurality of pixels arranged as a pixel array with rows and columns and at least one read-out arrangement for reading out the pixels row by row. The columns are grouped into blocks with a certain number N of columns. Each read-out arrangement comprises N column read out circuits and an addressing circuit for with at least two groups of addressing lines for addressing the blocks. The blocks are selectively addressed by the groups of addressing lines in a way that a read-out sequence of blocks addressed by the groups is continuous across all blocks.
摘要:
In a data bus with asynchronous data transmission via a clock and a data line, the transmitted data are ascertained by sampling with a multiple of the data rate of the data bus. Sampling is done in this case with a clock which is not synchronous with the asynchronous clock of the data bus. For avoiding interferences which develop due to the unnecessary operation of the interface circuit with a high frequency clock when no data are currently transmitted, a control circuit is provided for detecting the beginning and the end of a data transmission. Only at the beginning of a data transmission, the interface circuit will be supplied with the required clock. After the end of the data transmission, the clock for the interface circuit will be switched off again. The control circuit is preferably designed as a state machine which reacts, without the need for clock signals, to the states on the data and clock line of the data bus.
摘要:
The present invention relates to a method and a device for detecting the type of wobble on an optical recording medium. According to the invention, a programmable digitally tuned oscillator is provided for detecting the wobble at different frequencies and the wobble signal is converted to the base band. Favorably the consistency of the phase of the wobble together with the amplitude of the wobble is used for verifying the presence of the wobble. For this purpose a Cartesian to Polar converter is provided.
摘要:
The invention relates to a television receiver, in particular a projection television receiver having red, green and blue monochromatic picture tubes, the images of which are projected onto a picture screen. Each picture tube is assigned a correction device comprising a convergence circuit. The convergence circuit is assigned a memory in which correction values for the convergence correction of the three picture tubes are stored. In accordance with the correction values, the convergence circuit generates control signals, which are output to at least one correction coil where each correction coil has one driver circuit. A correction current is applied to the associated correction coil to correct image defects visible on each picture tube. The convergence circuit has control arrangement where the output signals coupled to the correction devices can be influenced in such a way that the same correction is always effected on the picture screen for a specific correction value, independently of the gain of the respective driver circuit. The invention also relates to a method for determining the control signal.
摘要:
A method is proposed for obtaining signals in electronic devices by means of interpolation between interpolation point values (W0 to W12), the interpolation point values (W0 to W12) being distributed linearly over a region. A number of interpolation values are calculated in each case at a specific interval between the interpolation point values (W0 to W12). The calculation of the interpolation values is then performed as follows: Firstly, a correction step value (a to 1) is determined in each case for an interval bounded by two interpolation point values (W0 to W12) by linear interpolation between these interpolation point values (W0 to W12) . These correction step values (a to 1) are calculated for all intervals. The calculation of the interpolation value in the current interval is then performed such that apart from the correction step value (a to 1) for the current interval use is also made at least of the correction step value (a to 1) of the preceding and/or of the following interval. As a result, the interpolation curve is laid smoothly through the intervals, and pronounced discontinuities in the gradient of the interpolation curve are avoided.
摘要:
A temperature monitoring process and device for controlling the operation of an recording and playback device in such a way that overheating is avoided. A temperature threshold is provided above which an economical operation mode is switched in, reducing power consumption and further heating.