TH16999B - Method for determining the position of the cassette recorder. - Google Patents

Abstract

1. Methods for positioning in cassette recorders 2.1 The determination of the in and out mechanism of the tape wrapping is performed using a position switch. With its output signal coupled through a resistance circuit, in this operation, the difference between the voltage values for different positions is minimal, thus making the valuation unreliable. The task is to ensure reliability. This increases by eliminating the need for a highly accurate resistance or extremely stable voltage in the circuit. 2.2 The voltage value given to each position individually is measured at the circuit output during calibration operations. Was inserted into memory And is used as the desired value during normal operation. 2.3 Especially for cassette tape recorders for analog or numerical audio or video recording.

Claims (4)

1. Method for positioning in cassette recorders with in and out mechanism. With position switches (A, B) where the switch output signal (A, B) is connected through a resistance network (R1, R2, R3) whose output is connected to the input of the converter. Analog-to-digital (W) with its characteristics During a calibration operation, the pressure values were given individually to each position. It is measured at the output of the resistance network circuit (R1, R2, R3). The corresponding digital value is inserted into the memory and used as the desired value during normal operation. The unique 1 right is The calibration operation ends automatically when a predetermined number of repositioning has occurred. 3. The unique approach to claim 1 is: The calibration operation is divided into 2 phases that differ in the movement direction of the mechanism and the counting direction of the position counter. 4. The unique method of claim 1 is: The instantaneous pressure is always compared with the preceding pressure in the comparator. 5. The unique method of claim 1 is Every time when a deviation of the pressure value That arise immediately from the previous pressure The movement of the mechanism is stopped, the pressure measurement is performed with a preset number of times. And the count of the position counters are toggled. 6. The claim 4 method, which is characterized by the mean, is established on the number of pre-defined measures. 7. Clause 2 or 6 method with The characteristic is that all the new mean values are calculated from the mean measured for the different phases. 8. The characteristic claim 1 method is: The calibration operation was performed at a mechanical speed lower than that of the mechanism during normal operation. 9. A unique method of claim 8: Mechanical speed reduction is performed with the alternating switching on of the motor driving the mechanism 1 0. A unique approach to claim 1 is: The initial position for the calibration operation is set by querying switch 1. 1. The characteristic claim 1 method, that is, the initial position for the calibration operation is performed by measuring the current supplied by the resistance network 1. 2. The unique approach to claim 1 is the starting position for a calibration operation. Defined in a time-controlled manner 1 3. A unique approach to claim 1 is that the initiation of a calibration operation is performed within Run of Test 1. 4. Method according to the claim 3,4,6,8 or 9, any one of which is unique as Inquiry of resistance network circuit wires Position count Comparison Generating the mean, control of the motor-driven mechanism. And the stored pressure value is activated by a microprocessor.