8 results about "Squelch" patented technology

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.

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.

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.

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.

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.

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.