6results about "Substations coupling interface circuits" patented technology

The invention provides a fire-fighting telephone audio signal processing circuit and processing method, and relates to the technical field of communication equipment, and the circuit comprises a signal processing module which is configured to process a local audio signal inputted from a local audio input port, generate a first processing signal with a phase opposite to that of the local audio signal, and send the first processing signal to the local audio input port; the first processing signal is sent to the bus port; receiving a mixed signal from a bus port, wherein the mixed signal comprises a forward audio signal from a far end and the first processing signal looped back through the bus; performing offset processing on the mixed signal based on a reference signal of the first processing signal so as to suppress the first processing signal component in the mixed signal, thereby outputting an audio signal of which the sidetone is suppressed at a far-end audio output port; and the parameter dynamic adjustment module is connected to the signal processing module and is used for dynamically adjusting the offset processing parameters according to the characteristics of the signal or the mixed signal of the far-end audio output port so as to optimize the sidetone suppression effect.

The utility model discloses a telephone line special common mode rejection circuit relates to communication anti -interference technical field, and this circuit passes through the synergic design of triode bias circuit, common mode inductance and direct -current capacitor, realizes three major functions: one is high -efficient suppression high -frequency common mode interference signal (the path of conversion into differential mode interference is blocked) ;Two is to provide direct current passage for telephone line to transmit feed current, three is to provide alternating current passage for low -frequency ringing signal. Meanwhile, the circuit has very small transmission influence to differential mode audio signal, can be directly connected in series in ordinary telephone communication equipment, makes it adapt strong interference scene (such as mechanical and electrical equipment, broadcast transmitting station nearby), and the call quality stability is obviously promoted.

The invention relates to an intelligent simulation telephone system, which comprises a line adapter and a telephone terminal, and is characterized in that the line adapter is connected with the telephone terminal through a four-core wire, and the four-core wire comprises a pair of power supply special wires and a pair of communication special wires; one input end of the line adapter is used for being connected with a mains supply, converting alternating current into direct current and then providing power for the phone terminal through the power supply special line; and an input / output end of the line adapter is used for being connected with an external communication end and realizing communication between the telephone terminal and the external communication end based on the communication special line.

This invention discloses an adapter for preventing mobile phone eavesdropping, comprising an adapter body integrating a dual Type-C interface module, a power matching circuit, a power management circuit, an LDO circuit, and a digital audio circuit. In the dual Type-C interface, the male Type-C1 connector connects to the mobile phone to transmit audio signals and receive charging voltage, while the female Type-C2 connector connects to an external charger for power. The power management circuit intelligently switches between charging and discharging modes based on signals such as VDET, charging the mobile phone and providing raw power to the LDO circuit. The LDO circuit regulates fluctuating voltage to power the digital audio circuit. The digital audio circuit takes over the mobile phone's audio path, cutting off malicious programs from direct connection to the microphone, achieving physical anti-eavesdropping while balancing charging and privacy protection.

The application relates to a double-circuit intelligent mine safety communication circuit and a telephone, wherein the communication circuit comprises a double-circuit switching circuit electrically connected with a master processor of the telephone, which is used for receiving input signals entering a mine intrinsic safety automatic telephone; a telephone ringing signal detection circuit electrically connected with the master processor, which is used for receiving input alternating current signals entering the mine intrinsic safety automatic telephone; a telephone ringing circuit electrically connected with the telephone ringing signal detection circuit, which is used for receiving input alternating current signals of the telephone ringing signal detection circuit; and an audio signal processing and protocol communication circuit electrically connected with the master processor, which is used for receiving and sending voice and protocol signals. The double-circuit telephone access mode is adopted, when one of the two circuits is disconnected or short-circuited, the communication can still be guaranteed, and the safety of mine communication is ensured.

The invention relates to a voice data acquisition and processing device based on Zynq, and the device comprises a voice acquisition module which is used for synchronously acquiring an environment sound signal in a machine and a voice signal of a main loudspeaker, and converting the environment sound signal and the voice signal into a digital voice signal and a digital environment sound signal for output after filtering; the noise estimation module is used for carrying out noise estimation according to the input digital voice signal and outputting a noise estimation result; the noise reduction module is used for carrying out noise reduction processing on the digital voice signal according to the noise estimation result to obtain a pure voice signal; the sound mixing module is used for mixing the pure voice signal and the digital environment sound signal to obtain a sound mixing signal; the silencing module is used for shielding noise input when no voice is played; the noise estimation module, the noise reduction module, the sound mixing module and the silencing module are integrated on a single Zynq SOC. The design and development cost of the built-in communication system can be reduced, the power consumption of a product is reduced, and the practicability of the system is improved.