Abstract: In a digital oscilloscope, a sharp and fine line can be displayed at high horizontal resolution. The digital oscilloscope includes a memory for storing waveform data to be displayed; a display data output unit including sync signal generating unit for generating a sync signal and an output unit for reading the waveform data from the memory in synchronism with the sync signal to output said read waveform data; and an audio/visual color dot matrix plane display device including a display unit having dots arranged in a matrix form for color representation. The scan clock signal generator generating the scan clock signal in synchronism with the sync signal produced from sync signal generating unit, and the dot scan control unit sequentially supplying the display data outputted from the output unit in synchronism with the scanning clock signal to the dots of the display unit, whereby the content of the waveform data is displayed on the display unit.

Abstract: Each solid image pick-up element of G, R and B channels has a light-receiving portion composed of light-receiving pixels arranged two-dimensionally, that is, in the horizontal and the vertical scanning directions. The light-receiving pixels of the second and the third solid image pick-up elements are shifted to a horizontal direction by a half of a horizontal interval between the adjacent pixels with respect to the light-receiving pixels of the first solid image pick-up element in the horizontal scanning direction. The output of the first solid image pick-up element is sampled at every predetermined period so that the video signal of the G channel is obtained. The output of the second and the third solid image pick-up elements are sampled at every predetermined period to obtain the video signals of the R and the B channels so that the video signals are out of phase by 180 degrees with respect to the video signal of the G channel.

Abstract: The SHF output power and channel frequency switching apparatus having an SHF power amplifier for amplifying an SHF signal and supplying the amplified SHF output power signal to a transmitting antenna, an amplification degree control circuit for controlling the amplification degree of the amplifier, an output power change-over switch for switching a plurality of levels of the SHF output power, a channel frequency change-over switch for switching channel frequencies of the output power signal, a memory having stored therein a table of control signals which are selected to have proper values for the respective positions of each of the output power change-over switch and the channel frequency change-over switch in order that a necessary output power level can be produced each time the channel frequency change-over switch is operated to switch, a control signal supply unit for reading from the table the control signals corresponding to the output power and channel frequency specified by the SHF output power change

Abstract: In radio communication system in which single frequency simultaneous transmission and reception is performed, a speech audio signal is divided by a predetermined time interval. A transmission time and a reception time are allotted in the predetermined time. A time-compressed signal is transmitted during the transmission time, and a time-compressed signal transmitted from other transceiver is received during the reception time and it is decompressed to the original length. The transmission time and the reception time are alternately repeated to transmit and receive the audio signals substantially simultaneously by a single frequency, and the audio signal is reproduced from the received signal. When communication with a telephone set is to be established, a DTMF signal is used as a dialing signal to call the telephone set from the transceiver. The DTMF signal is time-compressed and then transmitted along with the speech signal.

Abstract: An oscilloscope of the following type is disclosed. Even though a main unit of the oscilloscope is horizontally placed, a display can be adjusted at an optimal angle. Also, while the main unit remains in such a position, press buttons can be depressed stably. An operating section is covered in the case of carrying the oscilloscope and knobs of the operating section, and the like, can be kept out of the way, thereby not hampering portability. An oscilloscope casing is divided into a display section and an operating section. A part of the top surface of the main unit is lowered and the operating section is placed on the lowered surface. The display section doubles as a cover for the operating section and is pivotally fixed to the top surface of the main unit via a hinge so as to freely open and close. The display section has a display screen inside and forms the top surface of the main unit and covers the operating section outside when the display section is closed.

Abstract: A television camera apparatus having at least one image-pickup element with a light incidence portion and supported by an image-pickup element holder, a housing connected with the image-pickup element holder and enabling light to pass through a portion thereof for incidence on the light incidence portion of the image-pickup element, and a temperature controlling cooling section provided in a predetermined portion of the housing. The temperature controlling cooling section includes a cooling-side surface portion which is controlled to have a temperature lower than a temperature of the light incidence portion of the image-pickup element during operation of the television camera apparatus, so that free water contained in air inside of the housing is condensed on the cooling-side surface portion. The apparatus also enables discharge of the condensed water outside of the housing.

Abstract: A communication system of a time division multiple access method in which transmission data are transmitted in a unit of a frame having a predetermined number of symbols in which a pilot symbol is periodically inserted in a series of data symbols for compensation of fading distortion and a carrier is reset at each frame. A phase correction circuit for correcting phase variation due to the reset of carrier phase at each frame is provided. When pilot symbols except a frame in which fading distortion is to be compensated are used in a receiving side, the pilot symbols corrected by the phase correction circuit can be selected to thereby compensate fading distortion exactly regardless of an insertion position of pilot symbols in the frame even by using the interpolation method.

Abstract: An optical image of an object from the lens system is split in a predetermined ratio of light quantity and applied to first and second image pickup devices as first and second optical images. The dynamic range of a camera utilizing the first and second image pickup devices is increased and a signal from a first one of the first and second image pickup devices is utilized to control an iris and a signal from the second on of the first and second image pickup devices is utilized to control a charge storage time.

Abstract: A speech signal bandwidth compression and expansion apparatus and its method. On the transmitting side, system parameters are extracted from a speech signal by a linear prediction analyzer. A prediction residual signal is obtained by inverse filtering processing by using the system parameters. The prediction residual signal is lowered in sampling rate by a down-sampler and converted to a baseband signal. From the baseband signal, a time series signal is derived by a linear prediction synthesizer. Thereafter, the time series signal is converted to an analog signal and transmitted. On the receiving side, a received signal is subjected to inverse filtering processing to reproduce a baseband signal. The sampling rate of the reproduced baseband signal is raised to derive a time series signal. From the time series signal, a high frequency band component is generated. The high frequency band component is added to the baseband signal to generate an excitation signal.

Abstract: A radio communication system includes: a plurality of forward base stations each forming a macrocell; a plurality of reverse base station each forming a microcell in the associated macrocell; and a mobile communication control office connected between the forward base stations and a public or local area network. The mobile communication control office monitors the received signal's levels of signals sent from portable wireless terminals located in the reverse base stations, thereby specifying each reverse base station which is to exercise jurisdiction over the associated portable wireless terminals and performing the handover control. Since the reverse base station is installed every microcell, the transmitted power of each portable wireless terminal has only to be weak. Thus, the installation number of forward base stations and mobile communication control offices is increased, whereby the service area can be readily enlarged.

Abstract: There is provided a maximum likelihood decoding method, and an apparatus, capable of correcting burst errors caused by abrupt lowering of the signal amplitude. The soft decision maximum likelihood decoding method is a maximum likelihood decoding method for conducting maximum likelihood decoding on a received train resulting from addition of an error train to a transmission code train, which has been obtained by coding an information train by using convolutional codes on a transmission side. The soft decision maximum likelihood decoding method includes the step of making corrections by multiplying the soft decision likelihood metric having a multi-valued level, which has been obtained by soft decision likelihood metric from the received train, by weighting coefficients depending upon an instantaneous amplitude of the received signal, and the step of conducting maximum likelihood decoding by using corrected soft decision likelihood metric values.

Abstract: The transmitter section has a coder for converting an image signal into the coded data and producing the coded data at its output, a timer for producing time information which indicates a time lapse from a reference time, a first time data adding unit for adding the time information from the timer as the first time data to the coded data from the coder, a transmitter-side buffer for writing and reading the coded data with the first time data added, and a second time data adding unit for adding the time information from the timer as the second time data to the coded data read from the transmitter-side buffer, and sending the coded data to the transmission path.

Abstract: A radio communication apparatus for transmitting a voice signal and a data signal in a multiplex form. The transmitting side of the radio communication apparatus includes: a sampling unit for sampling the voice signal and the data signal and generating a digital voice signal and a digital data signal; a time division unit for dividing the digital voice signal and the digital data signal on the basis of a predetermined period; a modulation unit for modulating the divided digital data signal by a predetermined digital modulation scheme; a unit for compressing the divided digital voice signal at a predetermined compression factor and generating a compressed voice signal; a unit for combining the divided and compressed voice signal and the divided and digitally modulated digital data signal and generating a multiplex signal; and a unit for modulating a carrier signal by the multiplex signal and transmitting the modulated carrier signal as a transmission signal.

Abstract: A method and apparatus for detecting a peak value of a waveform signal continuously inputted during a predetermined time period.

Abstract: An image pickup device providing favorable images which effectively suppress the interference stripe noise originating in the interference stripes created on an image sensor surface of the image pickup device. The image pickup device includes an image sensor 3 and an overlying lid glass 2. By providing a prescribed inclination angle with respect to the relative position of the image sensor 3 and the lid glass 2 protecting it, the same number of interference stripes are provided with respect to each constitutional image-defining element within the image sensor 3, and prevention of interference stripe noise is achieved by leveling the average light intensity each constitutional image-defining element receives so that sensitizing of interference stripe noise does not occur at the specific elements.

Abstract: A transceiver having a transmitting unit and a receiving unit for performing substantially simultaneous communication with another transceiver in both directions by using a single frequency carrier. The transceiver includes a unit for generating a synchronizing signal for alternately switching between a transmission time period and a reception time period of the transceiver at a predetermined period, a signal processing unit for converting an input signal into a compressed signal by compressing a time axis of the input signal by a predetermined ratio, and affixing the synchronizing signal to the compressed signal, a unit for supplying the compressed signal with the synchronizing signal to the transmitting unit during the transmission time period, and a unit for reproducing an original signal from a signal transmitted from the other transceiver and received by the receiving unit during the reception time period, by expanding a time axis of the signal by a predetermined ratio.

Abstract: A radio apparatus including a circuit board and a housing in which the circuit board is mounted. An antenna portion, a receiving portion, and a transmitting portion are disposed on the circuit board. The transmitting portion includes a carrier-wave oscillator. The receiving portion includes a high-frequency section, a first intermediate frequency section, a second intermediate frequency section, and a first local oscillator. The high-frequency section, the first intermediate frequency section, the second intermediate frequency section, and the transmitting portion are disposed on the circuit board so as to surround the first local oscillator and the carrier-wave oscillator. The high-frequency section, the first intermediate frequency section, and the second intermediate frequency section each include a filter having an input terminal and an output terminal, and an amplifier having an input terminal and an output terminal.

Abstract: A digital video signal processing device for clipping a digital video signal to keep the signal at a predetermined level, includes an interpolation data signal generating unit for predicting video signal levels between adjacent sampling points for generating an interpolation data signal, clipping units for clipping the sampled video signal and the interpolation data signal at their levels, and a synthesizing unit for performing a predictive coding operation with respect to at least any one of the clipped video signal and the interpolation data signal and synthesizing these signals with each other.

Abstract: A picture signal encoding multiplexing method and apparatus in which encoded data of a plurality of picture signals, which are respectively output from a plurality of picture signal encoding processing units, is multiplexed in a channel multiplexing unit. The method includes the steps of: generating a transmission rate control signal corresponding to information related to the encoded distortion supplied from each of picture signal encoding processing units in a channel multiplexing unit, and supplying the transmission rate control signal to each of the picture signal encoding processing units; and outputting the encoded data of the picture signal from each of the picture signal encoding processing units in accordance with the transmission rate control signal.

Abstract: A radio apparatus having a unit for receiving a first signal from a first transceiver compressed in time by a predetermined rate, a unit for reproducing a first original signal from the first signal, a unit for receiving a second signal from a second transceiver compressed by the predetermined rate during the reception period of the first transceiver, a unit for reproducing a second original signal from the second signal, and a unit for adding the first and second original signals and outputting the added signal.