Techpoint, Inc.

Techwell, Inc.

Feng Kuo

Feng Yang

Chien-Chung Huang

Chi-Hao Yang

Jao-Ching Lin

Disclosure herein includes descriptions of a method for transmission of digital audio over analog video data with a single cable. The method comprising receiving, by a video transmitter, a digital video signal and one of a digital or an analog audio signal. Sampling, by an audio analog-to-digital converter (ADC), the audio signal if it is an analog audio signal. Storing, in a First-in-First-Out (FIFO) buffer, digital audio data corresponding to the sampled analog audio signal; reading, by an arbiter, the digitized audio samples, in response detecting an availability of data in the FIFO buffer and formatting the serialized audio bits with a digital start code; inserting the serialized audio bits and the digital start code into a blanking period of the digital video signal, thereby generating a combined digital audio and video signal and converting, by a digital-to-analog converter (DAC), the combined digital audio and video signal to analog, thereby generating a combined analog audio and video stream including audio data in a native form; and transmitting the combined analog audio and video stream to a receiver in one direction. In another embodiment, an analog signal is transmitted in the opposite direction.

Method and apparatus for transmitting and receiving audio over analog video transmission over a single coaxial cable

A method and system for transmitting and receiving an audio signal over a video signal in a single cable. The method and system including receiving an analog video signal, the analog video signal comprising one or more rows of video data, an audio header, and one or more quantized audio data. The method includes detecting, the audio header in a blank interval of the analog video and determining a reference level of the audio header. The method and system include extracting, in response to detecting the audio header, the one or more quantized audio data and converting the one or more quantized audio data to an original value of audio data based on the reference level of the audio header. The method and system are configured for storing the one or more quantized audio data in the original value in a First-in-First-Out (FIFO) buffer, and reconstructing, utilizing the FIFO buffer, a continuous audio signal from the one or more quantized audio data in the original value.

A method and an apparatus for improving digital video signal transmission over a long transmission line are disclosed. A simple equalization reference signal is generated and then combined with a digital video signal in the digital domain such that the transmission of the reference signal takes place at a predefined time period during the vertical blanking interval of the video signal. The combined signal is then converted into an analog video transport signal, which analog signal is then transmitted over the long transmission line to a downstream video receiver. The equalization reference signal is extracted and used at the video receiver to restore the analog video signal which in turn is converted back to digital video signal.

Method and apparatus for improving transmission of transport video signal

A video decoder for decoding a composite video signal. The decoder includes an analog-to-digital converter (ADC), an input resampler, and a Y/C separator, all coupled in series. The ADC receives and digitizes the composite video signal to generate ADC samples. The input resampler receives and resamples the ADC samples with a first resampling signal to generate resampled video samples. The Y/C separator receives and separates the resampled video samples into luminance and chrominance components. The Y/C separator includes a delay element configured to receive the resampled video samples and provide a variable amount of delay. The variable amount of delay can be adjustable from line to line, and is typically based on an approximated duration of a video line. For an NTSC signal, the variable delay is select to be (m&middot;n&plus;m/2) samples, where m is a ratio of frequencies of the resampling signal and a color subcarrier of the composite video signal, and n is an integer selected such that (m&middot;n&plus;m/2) samples most approximate the duration of a video line. For a PAL signal, the variable delay is selected to be (m&middot;n&plus;3m/4) samples.

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San Jose, CA, United States of America

Feng Kuo