Topic
Digital signal
About: Digital signal is a research topic. Over the lifetime, 44213 publications have been published within this topic receiving 345279 citations.
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Patent•
21 Mar 1994TL;DR: A recording and/or reproducing apparatus includes an optical system arranged to form an optical image, a photo-electric conversion part arranged to convert the optical imaged into an electrical signal, an A/D conversion circuit arranged to transform the electrical signal and audio signal into a digital signal, and a connector arranged to permit mounting and demounting a recording medium on which the digital signal obtained from the A/S conversion circuit is to be recorded as discussed by the authors.
Abstract: A recording and/or reproducing apparatus includes an optical system arranged to form an optical image, a photo-electric conversion part arranged to convert the optical imaged into an electrical signal, an A/D conversion circuit arranged to convert the electrical signal and/or an audio signal into a digital signal, a connector arranged to permit mounting and demounting a recording medium on which the digital signal obtained from the A/D conversion circuit is to be recorded, and a signal processing part for processing and converting the digital signal. The signal processing part is arranged to be mountable and demountable on and from the apparatus.
63 citations
Patent•
14 Feb 2002
TL;DR: In this paper, a solid-state imaging device is provided, which is capable of increasing an S/N ratio while enhancing a dynamic range, when a photoelectric signal is converted into a digital signal.
Abstract: A solid-state imaging device is provided, which is capable of increasing an S/N ratio while enhancing a dynamic range, when a photoelectric signal is converted into a digital signal. This solid-state imaging device comprises: a plurality of photoelectric conversion devices arrayed in rows and columns, each of the photoelectric conversion devices converting an optical signal into an electric signal and outputting a first signal voltage; a difference signal generation circuit provided for each column, for sequentially inputting the first signal voltage and a second signal voltage obtained by initializing the photoelectric conversion devices, thereafter converting the first signal voltage and the second signal voltage into charges, generating a difference signal therebetween, and then outputting the difference signal after adjusting a gain according to a level of the difference signal; and an analog/digital conversion circuit connected to the output of the difference signal generation circuit.
63 citations
Patent•
28 Nov 1994TL;DR: In this paper, an optical transmission system is disclosed in which an electric multilevel signal (V) composed of two electric digital signals (V1, V2) modulates a semiconductor laser.
Abstract: In optical transmission systems it is desirable to increase the bit rate of digital signals to, e.g., 40 Gb/s and more. In such systems there is an upper bit-rate limit above which conventional directly modulated lasers and their drive electronics cannot be employed. An optical transmission system is disclosed in whose optical transmitter (1) an electric multilevel signal (V) composed of two electric digital signals (V1, V2) modulates a semiconductor laser (4), so that an optical multilevel signal (V) is transmitted. The optical receiver (2) contains a decision circuit (7) which recovers the digital signals (V1, V2).
62 citations
Patent•
02 Feb 1999TL;DR: In this paper, a descrambler descrambles a transport stream output from a front end unit and supplies it to a digital interface and a demultiplexer, where the demultanexer extracts from the transport stream a compressed video signal and a compressed audio signal of a program specified by a user, and supplies the extracted signals to an MPEG decoder.
Abstract: In a digital broadcast receiving apparatus, digital broadcast signals provided by a digital broadcast method are supplied to various types of external units and are effectively utilized. In the above apparatus, a descrambler descrambles a transport stream output from a front end unit and supplies it to a digital interface and a demultiplexer. The demultiplexer extracts from the transport stream a compressed video signal and a compressed audio signal of a program specified by a user, and supplies the extracted signals to an MPEG decoder. The MPEG decoder decompresses the supplied video signal and the audio signal and supplies them to the digital interface, an NTSC encoder, and an audio signal D/A converter. The digital interface supplies either of the transport stream or the decompressed data to a digital external unit under the control of the controller.
62 citations
Patent•
13 Nov 1996
TL;DR: In this paper, an automatically gin-controlled digital received signal is AD converted to a digital signal, which is subjected to quadrature modulation processing through operation, that is, a digital detection is performed by software processing to change variable in each software processing in accordance with changes in the modulation method of the received signal and in the symbol transmission rate.
Abstract: An automatically gin-controlled digital received signal is AD converted to a digital signal, which is subjected to quadrature modulation processing through operation. The quadrature demodulation result is subjected to low-pass filter processing through operation, that is, a digital detection is performed by software processing to change variable in each software processing in accordance with changes in the modulation method of the received signal and in the symbol transmission rate.
62 citations