Tuning circuit
First Claim
1. A tuning circuit for providing a tuning signal to a tunable device, said device including a wave range change-over circuit, said tuning circuit comprising a setting circuit for generating a setting signal for consecutively tuning over a plurality of wave ranges, a threshold circuit, to which the said setting signal is applied, for providing a changeable d.c. voltage signal, which depends on the setting signal, said d.c. voltage signal having different, constant values corresponding, respectively, to each of said wave ranges and being switchable for each wave range at preselected amplitude levels of said setting signal by means of the threshold circuit, and further comprising a subtracting circuit responsive to said setting signal and said changeable d.c. voltage signal for providing said tuning signal.
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Accused Products
Abstract
In a tuning circuit for a receiver which is continuously tunable over a number of wave ranges by means of a setting circuit, the receiver having an automatic wave range change-over, the tuning voltage is obtained from a subtracting circuit in which a changeable constant voltage is subtracted from a setting voltage which was obtained by means of the setting circuit, this changeable constant voltage depending on the wave range for adaptation of the wave range limits to the wave range.
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Citations
5 Claims
- 1. A tuning circuit for providing a tuning signal to a tunable device, said device including a wave range change-over circuit, said tuning circuit comprising a setting circuit for generating a setting signal for consecutively tuning over a plurality of wave ranges, a threshold circuit, to which the said setting signal is applied, for providing a changeable d.c. voltage signal, which depends on the setting signal, said d.c. voltage signal having different, constant values corresponding, respectively, to each of said wave ranges and being switchable for each wave range at preselected amplitude levels of said setting signal by means of the threshold circuit, and further comprising a subtracting circuit responsive to said setting signal and said changeable d.c. voltage signal for providing said tuning signal.
Specification