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US 4,059,802 AGranted
Input level display circuit for receivers
AssigneeSony Corporation
InventorsMitsuo Ohsawa, Wataru Yamatani, Yukio Onoe
Life of this patent
Estimating the term…
Abstract
A receiver has a first input circuit and a first amplifier connected to a first rectifier circuit and has a second input circuit and a second amplifier connected to a second rectifier circuit. The first and second rectifier circuits produce first and second direct current signals, and the first and second rectifier circuits are connected to a meter drive circuit which produces a direct current signal in response to the first or second direct current signal so that the direct current signal from the meter drive circuit actuates a meter to indicate the input level of either the first input circuit or second input circuit.
Claims12
An input level display circuit for receivers, comprising:
- a. first and second input circuits for receiving and amplifying first and second broadcasting signals, respectively,
- b. first and second carrier amplitude detector circuits connected to said first and second input circuits, respectively, for producing first and second direct current signals, respectively;
- c. a meter drive circuit means connected to a current supply and supplied with said first and second direct current signals for producing a third direct current signal in response to either one of said first and second direct current signal;
- and
- d. an indicating means connected to a reference potential supplied with said third direct current signal for indicating the input level of either the first input circuit or the second input circuit, said indicating means being separated from said current supply by said meter drive circuit means.
2 more elements
An input level display circuit for receivers comprising:
- a. first and second input circuits for receiving and amplifying first and second broadcasting signals, respectively,
- b. first and second rectifying circuits connected to said first and second input circuits, respectively, for producing first and second direct current signals, respectively;
- c. a meter drive circuit supplied with said first and second direct current signals and producing a third direct current signal in response to either one of said first and second direction current signals;
- d. an indicating means supplied with said third direct current signal and indicating the input level of either the first input circuit or the second input circuit;
- e. said meter drive circuit being formed of first and second transistors having emitter electrodes connected together and having base electrodes also connected together, both the base electrodes being connected to the collector electrodes of the first transistor, the collector electrode of said first transistor being connected to said first and second rectifying circuits, and the collector electrode of said second transistor being connected to said indicating means.
2 more elements
An input level display circuit for receivers, comprising:
- a. first and second input circuits for receiving and amplifying first and second broadcasting signals, respectively,
- b. first and second rectifying circuits connected to said first and second input circuits, respectively, for producing first and second direct current signals, respectively;
- c. a meter drive circuit supplied with said first and second direct current signals and producing a third direct current signal in response to either one of said first and second direct current signals;
- d. an indicating means supplied with said third direct current signal and indicating the input level of either the first input circuit or the second input circuit;
- and
- e. said drive circuit including first and second current source circuits formed as a combining circuit, each of said first and second current source circuits comprising first and second transistors having emitter electrodes connected in common and having base electrodes connected together, the base electrodes of said first and second transistors of each of said first and second current source circuits being connected to the collector electrode of one of said first and second transistors, the collector electrode of the first transistor of said first current source circuit being connected to said first rectifying circuit, the collector electrode of the first transistor of said second current source circuit being connected to said second rectifying circuit, and the collector electrodes of said first and second current source second transistors being connected together and to said indicating means.
3 more elements
An input level display circuit for receivers comprising:
- a. first and second input circuits for receiving an amplifying first and second signals, respectively;
- b. first and second carrier amplitude detector means connected to said first and second input circuits respectively for producing first and second carrier level signals;
- c. a combining and current source means connected to a current supply for producing a third signal in response to either one of said first and second carrier level signals;
- and
- d. an indicating means connected to a reference potential driven by the third signal of said combining and current source means for indicating the carrier level of either of said first carrier level signals, said indicating means being separated from said current supply by said combining and current source means.
2 more elements
Dependencies are inferred from the claim text.