Apparatus comprising a circuit having an input/output response controllable by a control signal, and approximation method
AssigneeU.S. Philips Corporation
InventorYannick Deville
Life of this patent
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Abstract
The relationship between the input and output of a signal transfer circuit, such as a tune circuit, a filter, a phase shifter, an amplifier, etc., is determined by the circuit response to the input signal. The value of the circuit response (R) is controlled by the value (V) of a control signal supplied thereto. According to the invention, the relationship between the latter values is approximated by a linear regression function based on a number of measured first pairs of response/control signal values and based on such regression function a transcoder determines control signal values for providing response values of the circuit in accordance with second pairs of response/control signal values.
Claims7
An apparatus comprising:
- a signal transfer circuit which produces an output signal in response to an input signal thereto, the output signal being related to the input signal in accordance with a response value (R) of said circuit;
- means for supplying a control signal to said circuit which changes the response value (R) thereof in accordance with changes in the value (V) of said control signal;
- and calculation means for deriving second pairs (RA,VA) of response/control signal values on the basis of an approximation of the relationship between measured first pairs (R.sub.1,V.sub.1), (R.sub.6,V.sub.6) of response/control signal values;
- characterized in that:
- said apparatus further comprises coding means for deriving said approximation in the form of at least one linear regression function based on the measured first pairs of response/control signal values;
- said calculation means includes transcoding means which uses said linear regression function to transcode requested response values (REQ) into control signal values belonging to said second pairs of response/control signal values.
An apparatus comprising:
- a signal transfer circuit which produces an output signal in response to an input signal thereto, the output signal being related to the input signal in accordance with a response value (R) of said circuit;
- means for supplying a control signal to said circuit which changes the response value (R) thereof in accordance with changes in the value (V) of said control signal;
- and calculation means for deriving second pairs (RA,VA) of response/control signal values on the basis of an approximation of the relationship between measured first pairs (R.sub.1, V.sub.1), (R.sub.6, V.sub.6) of response/control signal values;
- characterized in that:
- said apparatus further comprises means for receiving externally supplied codes which define at least one linear regression function based on measured first pairs of response/control signal values, and supplying said codes to said calculation means;
- and
- said calculation means derives from said codes control signal values corresponding to requested response values (REQ), said response values and control signal values belonging to said second pairs of response/control signal values.
An apparatus as claimed in 1, wherein said circuit is any of the class consisting of a tuned circuit, a filter, an oscillator, a phase shifter, and an amplifier.
An apparatus as claimed in 1, included as part of a larger apparatus which is any of the class consisting of a tuner, a television receiver, a radio receiver, a video recorder and a camcorder.
A coding device for use with apparatus which comprises:
- a signal transfer circuit which produces an output signal in response to an input signal thereto, the output signal being related to the input signal in accordance with a response value (R) of said circuit;
- means for supplying a control signal to said circuit which changes the response value thereof in accordance with changes in the value (V) of said control signal;
- and calculation means for deriving second pairs (RA,VA) of response/control signal values on the basis of an approximation of the relationship between measured first pairs (R.sub.1, V.sub.1), (R.sub.6, V.sub.6) of response/control signal values;
- said coding device being characterized in that it comprises:
- means for receiving the measured first pairs of response/control signal values from said apparatus, and based thereon deriving said approximate relationship in the form of at least one linear regression function, and
- means for deriving from said regression function code combinations of control signal values and response values belonging to said second pairs of response/control signal values, and supplying said code combinations to said calculation means.
A method for use in apparatus which includes a signal transfer circuit which produces an output signal in response to an input signal thereto, the output signal being related to the input signal in accordance with a response value (R) of said circuit;
- said circuit being controlled by a control signal which changes the response value (R) thereof in accordance with changes in the value (V) of said control signal;
- said method generating at least one linear regression function which approximates first pairs (R.sub.1, V.sub.1), (R.sub.6, V.sub.6) of response/control signal values, and based on said regression function determining second pairs (RA,VA) of response/control signal values;
- said method being characterized in that it comprises:
- (i) determining a first linear regression function based on three pairs in a first series of measured pairs of response/control signal values (R.sub.3 /V.sub.3,R.sub.4 /V.sub.4,R.sub.5/ V.sub.5), said three pairs having errors of equal magnitude and alternating sign with respect to said first linear regression function;
- (ii) iteratively repeating step (i) for at least three other pairs in said first series of measured pairs of response/control signal values, to derive at least a second linear regression function;
- (iii) selecting that one of the derived linear regression functions which approximates all of the pairs in said first series of measured pairs of response/control signal values with minimal error;
- and
- (iv) using the selected derived linear regression function to provide control signal values for specified response values belonging to said second pairs of response/control signal values.
Dependencies are inferred from the claim text.