KR830007008A - Circuit for minimizing the effect of the level change of the received broadcast signals on the separation of the stereo sound receiver - Google Patents

Abstract

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Description

Circuit for minimizing the effect of the level change of the received broadcast signals on the separation of the stereo sound receiver

Since this is an open matter, no full text was included.

1 is a schematic diagram of a receiver useful for modulating a broadcast signal having amplitude and phase modulation components.

2 is a block diagram of a device according to a preferred embodiment of the present invention.

Claims (7)

An amplification device for amplifying the broadcast signal, a conversion device for providing an intermediate frequency signal, a demodulation device for providing demodulated first and second demodulated signals representing the sum signal and the difference signal, and A gain control device for providing a voltage for controlling the amplifying device to maintain the level of the demodulated first signal at a constant level, the amplitude of which is modulated by a sum of stereoacoustically related signals, In a receiver for providing stereoacoustically associated first and second signals from an angularly modulated broadcast signal having a difference of signals, an apparatus for combining the demodulated signals to form respective stereoacoustically associated signals is provided. Gain control for maintaining the level of the representative difference signal at a fixed level relative to the demodulated first signal O a phase divider network that is connected to receive a value and a signal from the amplifier and actually provides first and second output signals having a phase difference of 180 °, and respectively to provide stereoacoustic associated first and second signals. And a device for combining the phase divider output signals of the signal with the representative sum signal, wherein the gain control device is connected such that one of the inputs of the dual input MOSFET amplifier receives the control voltage and is further input. Minimize the effect of the level change of the received broadcast signals having a dual input MOSFET amplifier whose voltage appearing on the input to control the gain of the amplifier connected to receive the representative difference signal. Circuit for doing so. 12. A device according to claim 1, wherein the circuit for minimizing the effect of varying the level of received broadcast signals on the separation of a stereoacoustic receiver comprising a device for selectively blocking from the MOSFET amplifier. Apparatus according to claim 2, comprising a device for detecting the absence of stereoacoustically related signals in a received broadcast signal, the device being connected to connect the device for selectively blocking the device for coupling Circuit for minimizing the effect of a change in level of received broadcast signals on the separation of an acoustic receiver, wherein the level of received broadcast signals providing two output signals proportional to the sum signal. A device according to claim 2, wherein the device for selectively blocking is adapted to minimize the effect of a change in level of received broadcast signals in response to a manual mode selection switch on the separation of a stereophonic sound receiver. An amplifier device for receiving the broadcast signal, a converter for providing an intermediate frequency signal, and a demodulator device for providing first, second, and second demodulated signals representing the sum signal, the difference signal, and the signals, respectively; A broadcast signal whose amplitude is modulated by a sum signal of two related signals, whose phase is modulated by a difference signal of the two signals which are stereoacoustically related, and whose frequency is modulated by low frequency signals A receiver comprising: a circuit for processing the demodulator device signal, a circuit for providing a dc voltage proportional to a level of a received broadcast signal, a control input connected to receive the dc voltage, and the second signal; A gain control amplifier having an input for providing a signal having an amplitude proportional to the amplitude of the received broadcast signal, A phase divider for providing two signals from the amplifier output signal having a phase difference of 180 °, and an apparatus for combining the corrided first signal and the phase divider output signals to provide two stereophonically related signals And the apparatus for detecting that the demodulated third signal is absent and the voltage controlled amplifier output when the demodulated signal is not detected such that the apparatus for coupling provides a signal proportional to the demodulated first signal. A circuit for minimizing the effect of a change in level of received broadcast signals on the separation of a stereoacoustic receiver, comprising a device for blocking a signal. The circuit of claim 5, wherein the circuit for minimizing the effect of the level change of the received broadcast signals on the separation of the stereo acoustic receiver comprises a manual switch device for blocking the signal from the sound voltage control amplifier output path. The circuit of claim 5, further comprising minimizing the effect of level change of the received broadcast signals on the separation of the stereophonic receiver, including a device for blocking the signal from the voltage controlled amplifier in response to the mute signal from the receiver. Circuit for. ※ Note: The disclosure is based on the initial application.