Abstract: An estimator of error rate is provided for reducing variations of an error pulse count value at burst signals of a received signal for digital mobile communications and thereby improving an accuracy of estimating an error rate. The estimator of error rate includes detectors for detecting that phase information derived from a baseband signal of an I channel (I signal) and a baseband signal of a Q channel (Q signal) is located in an error pulse generation area, detectors for detecting that envelope information of the I signal and the Q signal is located in the error pulse generation area, and a counter for detecting that the phase error signal and the envelope error signal are outputted and counting the signals. The estimator operates to estimate an error rate based on an error pulse count value at one period. The estimator operates to detect that the phase information and the envelope information are located in the error pulse generation area.

Abstract: A received signal obtained from an antenna is subjected to high-frequency amplification. The amplified signal is supplied to a first bandpass filter, which extracts only signals of all the channels of a communications system concerned while filtering out other radio signals. The extracted signals are frequency-converted by using a local oscillation frequency, and only a desired wave is passed by a second bandpass filter. The desired wave is supplied to a sample-and-hold circuit, which performs sampling according to the bandwidth-limiting sampling theorem. A resulting discrete signal is supplied to an I-axis-component and Q-axis-component separating circuits, where the polarity of sample values is inverted for every other clock pulse with respect to each of the I and Q axes to thereby effect Hilbert transform. Resulting two orthogonal components on a phase plane are supplied to a complex coefficient filter.

Abstract: A received signal obtained from an antenna is subjected to high-frequency amplification. The amplified signal is supplied to a first bandpass filter, which extracts only signals of all the channels of a communications system concerned while filtering out other radio signals. The extracted signals are frequency-converted by using a local oscillation frequency, and only a desired wave is passed by a second bandpass filter. The desired wave is supplied to a sample-and-hold circuit, which performs sampling according to the bandwidth-limiting sampling theorem. A resulting discrete signal is supplied to an I-axis-component and Q-axis-component separating circuits, where the polarity of sample values is inverted for every other clock pulse with respect to each of the I and Q axes to thereby effect Hilbert transform. Resulting two orthogonal components on a phase plane are supplied to a complex coefficient filter.

Abstract: A differential detector imparted with error correcting function for detecting a differentially phase shifted signal while performing error correction includes a one-symbol differential detector for performing phase comparison between a current input signal and a signal preceding by one symbol, a delay circuit for delaying a one-symbol differential detection signal by two symbol periods, a two-symbol differential detector for performing phase comparison between the current input signal and an input signal preceding by two symbol periods, a four-symbol differential detector for performing phase comparison between the current input signal and an input signal preceding by four symbol periods, and two error correction circuits.

Abstract: A receiving circuit includes a first antenna 1, a second antenna 2, units 10 and 11 for generating a sum signal or a difference signal from signals of two paths received by the respective antennas, a unit 12 for giving delay to either an output of the sum signal generating unit or an output of the difference signal generating unit, a unit 13 for summationally combining an output of the delay unit and the signal of the not-delayed path, a desired-wave pass filter unit 14 for receiving an output of the summationally combining unit, a dividing unit 15 for receiving an output of the desired-wave pass filter unit, an orthogonal detection unit 16-19 for receiving an output of the dividing unit, and a filter unit 20 and 21 for receiving an output of the orthogonal detection unit to extract a base band signal therefrom, wherein the receiving path including the summationally combining unit and the following are made into one path to thereby attain miniaturization and low power consumption.

Abstract: A received signal obtained from an antenna is subjected to high-frequency amplification. The amplified signal is supplied to a first bandpass filter, which extracts only signals of all the channels of a communications system concerned while filtering out other radio signals. The extracted signals are frequency-converted by using a local oscillation frequency, and only a desired wave is passed by a second bandpass filter. The desired wave is supplied to a sample-and-hold circuit, which performs sampling according to the bandwidth-limiting sampling theorem. A resulting discrete signal is supplied to an I-axis-component and Q-axis-component separating circuits, where the polarity of sample values is inverted for every other clock pulse with respect to each of the I and Q axes to thereby effect Hilbert transform. Resulting two orthogonal components on a phase plane are supplied to a complex coefficient filter.

Abstract: A recording apparatus has a main body case housing a printing head. A recording-paper insertion slot is formed in the upper surface of the case and a recording paper discharge slot is formed in the side surface of the case. A pair of stop levers are mounted on the upper surface so as to be pivotable between standing and horizontal positions. A part of the upper surface is used as a continuous-recording-paper receiving portion on which the recording paper is placed and is led to the insertion slot. The standing stop levers contact the insertion-slot-side end of the recording paper to hold it in its predetermined posture or position and restricts the movement of the recording paper toward the insertion opening.

Abstract: The invention provides an original reading apparatus which is small in overall thickness, light in weight and easy to hold by hand. The original reading apparatus includes a body case in the form of a flattened casing in which a power source and an electric controlling section to which power is supplied from the power source are contained. The body case has an original insertion opening formed in a wall thereof, and an original passageway is formed in the body case and communicated with the original insertion opening. An original reading section is disposed in the original passageway, and an operating section is mounted on the body case such that an operating face thereof is disposed on a surface of the body case. The original reading section and the operating section are disposed in a juxtaposed relationship in a horizontal position at a substantially same height.

Abstract: A recording apparatus comprises a recording unit disposed in a case and including support members for supporting a platen a printing head and a sheet feed guide having an outlet situated near a region between the platen and the printing head an an inlet situated on the side of the rolled recording sheet loaded in the case, the sheet feed guide serving to guide the recording sheet from the inlet toward the outlet, thereby delivering the sheet to the region between the platen and the printing head the support members support the sheet feed guide and is rockable between a recording position, where the inlet of the sheet feed guide faces the recording sheet, and a sheet insertion position, where the inlet of the guide faces on opening of the case. The printing head is disengaged from the platen when the support members are brought to the sheet insertion position.