18 results about "Squelch" patented technology

A squelch detection device is provided. The squelch detection device receives first and second input signals and first and second threshold voltages. The squelch detection device determines a first common mode of the first and second input signals and a second common mode of the first and second threshold voltages. The squelch detection device averages the first common mode with the second common mode to produce an average common mode and sets the first common mode of the first and second input signals to the average common mode. The squelch detection device sets the second common mode of the first and second threshold voltages to the average common mode and determines a state of a squelch signal, indicative of whether the first and second input signals are attributable to noise, based on the first and second input signals and the first and second threshold voltages.

The invention provides a signal processing method, communication equipment and a storage medium. The signal processing method comprises the following steps: acquiring an input signal; determining an out-of-band noise variance of the input signal outside the preset frequency band; determining a spectral entropy value of the input signal in response to the out-of-band noise variance within a preset variance threshold range; and adjusting the squelch threshold level of the communication equipment according to the spectral entropy value, and / or adjusting the noise reduction level of the communication equipment according to the spectral entropy value. Through the above mode, the out-of-band noise variance is combined with the spectral entropy method, the quality grade of the audio is divided, and the appropriate noise reduction grade and the appropriate squelch grade are adjusted and determined according to the quality grade, so that the communication quality under a weak signal or a limit distance is improved, and the use requirements of different scenes are met.

Aspects of this disclosure relate to squelching a symbol at a symbol boundary. A transmit squelch block can squelch a portion of a symbol at a symbol boundary. The transmit squelch block can be included in a symbol based envelope tracking system. Transmit squelching can reduce spurious emissions associated a symbol based envelope tracking voltage toggling on a symbol boundary.

High-speed data communication devices, e.g., repeaters, interfacing between a host and a peripheral operate such that high-speed components except for a host-side squelch detector are set or maintained in a deactivated state during an idle period of a micro frame. In an example, a start of a micro frame is detected on a data bus during a first time period. In a second time period after the first time period, the high-speed communication device determines whether at least one data packet is contained in the micro frame. When it is determined during the second time period that no data packet is contained in the micro frame, active components, except a squelch detector, are controlled to be inactive during a third time period after the second time period.

A USB-capable device includes an eUSB device repeater includes D+ and D− lines for communicating via a USB bus, and eD+ and eD− lines for communicating via an eUSB bus. The repeater includes a squelch detector for detecting a differential voltage between the D+ and D− lines and comparing it to a squelch threshold voltage based on a selectively variable squelch threshold voltage level at the squelch detector. During USB bus reset the squelch detector compares the differential voltage to a chirp-specific squelch threshold voltage level and the squelch signal indicates no K chirp or J chirp activity on the USB bus. The repeater thereby avoids false detections of invalid chirps and more reliably detects end of USB bus resets. A USB2 bus reset sequence windowing scheme is also provided.

To provide a radio capable of performing squelch control with little erroneous determination regardless of the voice quality of a speaker. [Solution] The radio 20 in this example comprises an SSB demodulation unit 21 that performs SSB demodulation processing on the received signal, a noise cancellation unit 22 that performs noise cancellation processing on the audio signal resulting from demodulation by the SSB demodulation unit 21, a pitch period calculation unit 23 that calculates the pitch period of the audio from the audio signal after noise cancellation processing, and a squelch control unit 24 that controls the opening and closing of the squelch of a squelch circuit 25 based on the pitch period calculated by the pitch period calculation unit 23.

The invention discloses a satellite radio frequency switch position judgment method under an in-orbit telemetering-free condition, and the method comprises the steps: selecting a transponder channel for testing under the condition that a radio frequency switch is located at a to-be-tested position; limiting a telemetering normal value range during testing; combing instructions and telemetering codes required by testing; adjusting the positions of other radio frequency switches, and communicating the radio frequency switch to be tested with the transponder channel; setting a transponder squelch state, and recording a test spectrum; setting a transponder gain gear, and recording a test frequency spectrum; and comparing the frequency spectrum data, and judging the on-off state of the to-be-tested position of the radio frequency switch. The problem that the switch position cannot be judged after the satellite radio frequency switch telemetering function breaks down in orbit is solved, and the operation requirements of payload adjustment tasks such as single-machine switching and beam switching in a transponder channel for radio frequency switch rotation are met while the safety of each single machine of the satellite payload is ensured.

A squelch detection device is provided. The squelch detection device receives first and second input signals and first and second threshold voltages. The squelch detection device determines a first common mode of the first and second input signals and a second common mode of the first and second threshold voltages. The squelch detection device averages the first common mode with the second common mode to generate an average common mode, and sets the first common mode of the first and second input signals as the average common mode. The squelch detection device sets the second common mode of the first and second threshold voltages as the average common mode, and determines a state of a squelch signal based on the first and second input signals and the first and second threshold voltages, the squelch signal indicating whether the first and second input signals are attributable to noise.

Audio undergone squelch process and audio not undergone squelch process are both dealt with by a controller, while increase in communication traffic or consumed resource in an arithmetic section is prevented. A radio processing device of a radio communication system includes an output control section which outputs, to the controller, a packet including at least one unit audio data and squelch information corresponding to the respective unit audio data and indicating a determination result of a squelch determining section which determines whether to open or close squelch, and the controller includes: an audio data output section outputting, as audio data undergone a process according to squelch information or as audio data not undergone the process according to squelch information, the unit audio data in the packet from the radio processing device.

A squelch detector is disclosed by the present application. By configuring the first to third bias current sources and a mirror ratio of the current mirror circuit, when an amplitude difference between first and second input signals is smaller or greater than a squelch threshold, flip of an output node in the squelch detector depends only on the squelch threshold and is independent of variations of process, voltage and temperature (PVT) parameters. Thus, the squelch detector can always provide reliable amplitude detection of input signals despite of possible variations of the PVT parameters.

This invention relates to at least one channel (2) in a radio, an operation mode (3) enabling data to be transmitted through the channel (2) by means of radio signals, a squelch setting (4) that cuts off signals at a level below a manufacturer-predetermined threshold in the channel (2) when it is switched on and transmits all signals in the channel (2) when it is switched off, a memory (5) that stores the squelch setting (4) for each channel (2), and a processor (6) that processes the data in the memory (5) and applies the squelch setting (4) to the signals transmitted over the channel (2).

The invention relates to transmit signal squelch at symbol boundaries. Aspects of the present disclosure relate to silencing symbols at symbol boundaries. The transmit squelch block may squelch a portion of the symbol at the symbol boundary. The transmit squelch block may be included in a symbol-based envelope tracking system. Transmit squelch may reduce spurious emissions associated with symbol-based envelope tracking voltages that switch over symbol boundaries.

An apparatus, system, and method for low frequency periodic signaling (LFPS) and / or squelch detection are provided. A circuit can include a threshold generator situated to receive a differential input signal from an initiator device and generate a differential voltage threshold signal based on the differential input signal, an amplifier circuit electrically coupled to the threshold generator situated to amplify the differential voltage threshold signal resulting in an amplified threshold signal, a sampler situated to sample the amplified threshold signal at a first clock rate faster than a clock rate of an LFPS / squelch signaling frequency resulting in digital sample results, and a pattern filter circuit situated to determine if the digital sample results are asserted for each of a specified number of consecutive clock cycles at the first clock rate.

Amplifiers incorporating squelch circuits and functionality are described. An example amplifier circuit includes an amplifier and a squelch circuit coupled to the amplifier. The squelch circuit is configured to squelch an output of the amplifier by bypassing current from the amplifier. The squelch circuit can include a bypass switch coupled with a transistor of the amplifier and a control circuit coupled to the bypass switch. The control circuit can be configured to control operation of the bypass switch. The bypass switch can be implemented as a bypass transistor coupled in parallel with a transistor of the amplifier. The control circuit can include a biased voltage divider leg with a pair of resistors, a current source coupled at a node between the pair of resistors, and a pair of control switch transistors coupled across a resistor among the pair of resistors.

A serial bus repeater includes first and second ports adapted to be coupled to respective devices. A first termination resistor network couples to the first port. A second termination resistor network couples to the second port. A squelch detect circuit couples to the first bus port and is configured to detect activity on the first bus and to generate a squelch signal responsive to detection of activity on the first port. A first state machine is configured to: determine an elapsed time during which the squelch signal indicates activity on the first port; determine that the elapsed time exceeds a first threshold; and, responsive to the determination that the elapsed time exceeds the first threshold, assert configuration signals to reconfigure the first and second termination resistor networks.

High-speed data communication devices, e.g., repeaters, interfacing between a host and a peripheral operate such that high-speed components except for a host-side squelch detector are set or maintained in a deactivated state during an idle period of a micro frame. In an example, a start of a micro frame is detected on a data bus during a first time period. In a second time period after the first time period, the high-speed communication device determines whether at least one data packet is contained in the micro frame. When it is determined during the second time period that no data packet is contained in the micro frame, active components, except a squelch detector, are controlled to be inactive during a third time period after the second time period.

A system and method for determining a squelch level for each transformer in a series of transformers connected to a power line that communicate with each other through PLC. The method includes selectively transmitting a PLC test message by each transformer on the power line both upstream and downstream of the transmitting transformer to determine that the transmitting transformer can communicate with other transformers; responding to the PLC test message that is received by each transformer to identify the transformers that can communicate with the transmitting transformer; measuring the RSSI of the PLC messages that each transformer receives; recording the strongest RSSI in each transformer of the PLC messages that are received by the transformer; and setting the squelch level for each transformer as a predetermined reduction of the recorded RSSI in each transformer.

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.