5results about "Analog signal digital control" patented technology

Systems, methods, apparatus, and articles of manufacture to control audio playback devices are disclosed. An example method includes receiving (1302) first audio information from a first audio information source; generating (1304) audio signals based on the received first audio information from the first audio information source; receiving (1306) a source command from a user input device to change to a second audio information source; and in response to the source command: changing (1308) a signal source to the second audio information source and sending (1310) a volume message to the first audio information source to change a volume setting of the first audio information source.

A circuit includes an analog-to-digital converter (ADC). The circuit also includes an analog front end (AFE, 310) having an AFE input and an AFE output. The AFE output is coupled to an input of the ADC. The AFE includes a programmable gain amplifier (PGA, 115) having a first PGA input and a second PGA input. The PGA (115) includes a first operational amplifier (OP AMP, OP1) having first and second OP AMP inputs. The AFE (310) also includes a programmable resistance circuit (320) having a first programmable resistance circuit input and first and second programmable resistance circuit outputs. The first programmable resistance circuit input is coupled to the first and second PGA inputs. The programmable resistance circuit (320) includes a resistor network having first and second balancing resistances. The first balancing resistance is coupled to the first and second OP AMP inputs, and the second balancing resistance is coupled to the first and second OP AMP inputs.

An ultrasonic sensing system (210) includes an amplifier (300) including an input and an output; and an n-level comparator (302), coupled to the output of the amplifier (300), to compare an adjustable threshold voltage to an output signal from the output of the amplifier (300). N is greater than or equal to 1. The system (210) also includes a noise power estimator (314), coupled to an output of the n-level comparator (302), to generate a noise power signal indicative of noise power of an input signal at the input of the amplifier (300). The system (210) further includes a time-varying threshold circuit (312), coupled to the noise power estimator (314) and the n-level comparator (302), to adjust the adjustable threshold voltage based on the noise power signal.

A network transceiver device is provided, including at least two variable gain amplifiers (VGAs), and at least two sets of analog digital converters (ADCs), each set including ADCs coupled to an output of one of the VGAs, the sets being arranged in VGA-specific channels. The device includes a plurality of feed-forward equalizers (FFEs), each FFE being coupled to receive an output of one of the ADCs in one of the VGA-specific channels. Each FFE is configured to adaptively equalize the output received from the ADCs utilizing a first equalization coefficient subset with coefficient values that are common to all FFEs, and a second equalization coefficient subset that is channel specific and that has a first set of coefficient values for a first VGA-specific channel and a second set of coefficient values for a second VGA-specific channel, the sets of coefficient values being computed independently.