公开(公告)号：JPH01268321A

公开(公告)日：1989-10-26

申请号：JP9566688

申请日：1988-04-20

Applicant: TOSHIBA CORP

Inventor： KUDO KYOICHI ,  NAKAMURA MAKOTO

IPC: H04J4/00 ,  H04B7/15 ,  H04B7/208

Abstract: PURPOSE:To simultaneously use two or more terminal equipments in one earth station by providing a first modulating circuit for executing a modulation output by changing a transmission frequency band, and a second demodulating circuit for executing a demodulation by changing a demodulation synchronizing speed. CONSTITUTION:A signal from an earth station 1 which has passed through a communication satellite 3 is received by a central control station 2, and a receiving signal is demodulated by a second demodulating circuit 22. When a line control circuit 25 receives a calling signal from other terminal equipment 11b than, for instance, a terminal equipment 11a in the earth station 1 being in the course of communication already, a synchronizing speed control circuit 32 leads out a demodulation synchronizing speed signal of two times and generates a line allocating signal so as to supply said signal to the second demodulating circuit 22. The first control signal extracting circuit 14 of the earth station 1 extracts the line allocating signal from in the demodulating signal and supplies it to the first modulating circuit and a modulation frequency band is doubled. In such a way, plural terminal equipments can be operated simultaneously without raising the transmission power.

公开(公告)号：JPS63166329A

公开(公告)日：1988-07-09

申请号：JP31537286

申请日：1986-12-26

Applicant: TOSHIBA CORP

Inventor： NAKAMURA MAKOTO

IPC: H04J3/00 ,  H04B7/15 ,  H04B7/212

Abstract: PURPOSE:To allocate many slave stations with a low access line utilizing rate through a few channel numbers by assigning a private access channel to a slave station having a high access line utilizing rate and assigning a common access channel to a slave station having a low access line utilizing rate. CONSTITUTION:A time slot N1 being a private access channel is assigned to a large sized earth station 201 having lots of traffics and then selecting an assignment request signal frequently. The transmission of a signal from other large sized earth stations 201-205 and small sized earth stations 101-1040 is inhibited in the time slot N1. Similarly, as to the other earth stations 202-205, exclusive time slots N2-N5 are assigned. Five time slots are used in common in the small sized earth stations 101-1040 having less traffic and rarely sending the assignment request signal. Thus, many stations with a low traffic are accommodated more than a conventional system.

公开(公告)号：JPS6343428A

公开(公告)日：1988-02-24

申请号：JP18690186

申请日：1986-08-11

Applicant: TOSHIBA CORP

Inventor： NAKAMURA MAKOTO

IPC: H04J3/00 ,  H04B7/15 ,  H04B7/204

Abstract: PURPOSE:To send a low speed call with efficient utilization of line by sending plural low speed calls in the lump even if the TDMA timing control in matching with a high speed call is used. CONSTITUTION:Earth stations 501-50N identify whether or not a call during communication managed by one's own station is a high speed call or a low speed call, and TDMA transmission/reception is applied with an opposite earth station by using TDMA timing in matching with a high speed call in case of the high speed call. On the other hand, in case of the low speed call, an address representing an opposite earth station is added to multiplex plural calls and the result is sent to a low speed relay earth station 20. The low speed relay earth station 20 reconstitutes a data at each earth station receiving the low speed call and multiplexes it and sends the result to each reception earth station.

公开(公告)号：JPS62176235A

公开(公告)日：1987-08-03

申请号：JP1720386

申请日：1986-01-29

Applicant: TOSHIBA CORP

Inventor： UNO SHINTARO ,  NAKAMURA MAKOTO ,  TAKADA TAIJI

IPC: H04J3/00

Abstract: PURPOSE:To attain the data communication between a master station and a slave station with less propagation delay by switching the system into a time division multiplex system when data collision takes place between slave stations due to increased traffic or the occurrence of data collision is estimated. CONSTITUTION:A radio channel is sectioned into a time slot of a prescribed length and plural slave stations S1-S5 send a data at random to the master station in synchronism with the time slot. When the traffic of the radio channel is increased and the data collision takes place between the slave stations or the occurrence of data collision is expected, the system is changed over into the time division multiplex system.

公开(公告)号：JPS61218240A

公开(公告)日：1986-09-27

申请号：JP5986885

申请日：1985-03-25

Applicant: TOSHIBA CORP

Inventor： NAKAMURA MAKOTO

IPC: H04J3/06 ,  H04L7/00 ,  H04L7/08 ,  H04L27/22

Abstract: PURPOSE:To establish main frame synchronization by using a reception signal having phase uncertainty to detect a received synchronizing signal including the 1st and 2nd synchronizing signals and a signal having a different phase thereby establishing a sub-frame synchronization and comparing the signal with the received synchronizing signal before one sub-frame period. CONSTITUTION:The frame synchronization circuit consists of a frame signal detection circuit 11, an OR circuit 12, a sub-frame synchronizing circuit 13, a differential detection circuit 14 and a main frame synchronizing circuit 15. Since the 1st synchronizing signal MF and the 2nd synchronizing signal SF are in the relation where 0, 1 levels are inverted, the sub-frame synchronization is attained without increasing the number of detectors especially. Since it is utilized that the reception synchronizing signal received at present and the received synchronizing signal existing before one sub-frame period differ at the tip of the main frame only and the main frame synchronization is established by comparing the both, the sure main frame synchronization is established without using a main frame detection detector 15 and a sub-frame detection detector 13 separately.

公开(公告)号：JPS61129925A

公开(公告)日：1986-06-17

申请号：JP25115284

申请日：1984-11-28

Applicant: Nippon Telegr & Teleph Corp ,  Toshiba Corp

Inventor： OTANI KOICHI ,  KISHINO AYANORI ,  NAKAMURA MAKOTO ,  SUZUKI HIDEO

IPC: H04B3/06 ,  H04B3/04 ,  H04J99/00

CPC classification number: H04B3/04

Abstract: PURPOSE:To keep always a power level of each channel to a prescribed value even when the operating channel number is changed by controlling variably a power level of a multilex signal in response to the operating channel number and applying an output to a common demodulation circuit for demodulation. CONSTITUTION:The operating channel number is detected by a channel number detection circuit 3 from each channel output of a channel common demodulation circuit 2. Then the channel common AGC is controlled in response to the operating channel number detected by the channel number detection circuit 3 to keep the power level of each channel to a prescribed value at all times.

Abstract translation: 目的：即使通过根据操作通道号控制多值信号的可变功率电平来改变操作通道号，也可以将每个通道的功率电平始终保持在规定值，并将输出应用于公共解调电路 解调。 构成：通道号检测电路3从通道公共解调电路2的每个通道输出检测工作通道号。然后响应由通道号检测电路3检测到的工作通道号而控制通道公共AGC 始终将每个通道的功率电平保持在规定的值。

公开(公告)号：JPS58215839A

公开(公告)日：1983-12-15

申请号：JP9951382

申请日：1982-06-10

Applicant: Toshiba Corp

Inventor： SUGIYAMA FUMIO ,  NAKAMURA MAKOTO ,  SUU HIROSHI

IPC: H03M1/12 ,  H04B1/66 ,  H04B14/04

CPC classification number: H04B1/66

Abstract: PURPOSE:To secure the quality of signal and to attain effective encoding, by detecting the period of pitch of a voice signal for obtaining an average power of the voice signal within a time being an integer multiple of the period of pitch, and encoding the result. CONSTITUTION:The voice signal (v) is applied to a pitch extracting circuit 1 and to an accumulating adder 3 via a delay circuit 2. Further, the circuit 2 supplies the voice signal (v) to the adder 3 until the circuit 1 detects the period of pitch of the voice signal (v). The adder 3 performs adding processing within a time being an integer multiple of the period of pitch, e.g., a time limited to N-times the time of the period of pitch, with counting a clock signal by means of a built-in counter. When the adder 3 obtains the amplitude voltage of the voice signal (v) and accumulates the voltage, the average voltage value of the voice signal (v) is obtained with a divider 4 dividing the summed value with the N. Thus, the average power of the voice signals within one frame is applied to the encoding circuit and the signals are encoded digitally at each frame.

Abstract translation: 目的：为了确保信号的质量并实现有效的编码，通过检测语音信号的间距周期，以获得语音信号的平均功率，作为音调周期的整数倍，并对结果进行编码 。 构成：语音信号（v）经由延迟电路2被施加到音调提取电路1和积累加法器3.此外，电路2将语音信号（v）提供给加法器3，直到电路1检测到 语音信号（v）的音调周期。 加法器3通过内置计数器对时钟信号进行计数，在时间周期的整数倍的时间内执行加法处理，例如，限制为间距周期的N倍的时间。 当加法器3获得语音信号（v）的振幅电压并累积电压时，用除法器4将求和值除以N获得语音信号（v）的平均电压值。因此，平均功率 一帧内的语音信号被施加到编码电路，并且信号在每帧被数字地编码。

公开(公告)号：JPS58181344A

公开(公告)日：1983-10-24

申请号：JP6342582

申请日：1982-04-16

Applicant: Toshiba Corp

Inventor： NAKAMURA MAKOTO

IPC: H03M7/32 ,  H03M3/04 ,  H04B14/06

CPC classification number: H03M3/042

Abstract: PURPOSE:To simplify the entire scale and to improve the S/N of a reproducing signal, by using a predictive filter taking partial autocorrelation and spectrum versus parameter as coefficients for both an adaptive type predictive encoder and an encoder. CONSTITUTION:A predictive coefficient is extracted by an analysis circuit 37 from a signal Sn supplied to a terminal 31 and it is applied to a predictive filter 36 at the transmission side and a predictive filter 45 at the reception side, respectively. A substractor 34 performs subtraction between signal Sn set from the terminal 31' and a signal Sn' sent from an adder 35 and supplies an output signal 6n to an encoder 33 for quantization and then to a decoder 43 at the reception side vai a terminal 38. An output signal 6n' is outputted to an adder 35 via a decoder 34 at the transmission side. The adder 35 adds the signal 6n' to an output signal gamman of the filter 36 and gives the result to a subtractor 32 as a predictive signal sn'. The signal of a decoder 43 is added to an output signal of the filter 45 and the added signal is outputted as a reproducing signal from a terminal 46.

Abstract translation: 目的：为了简化整个尺度并改善再现信号的S / N，通过使用预测滤波器，采用部分自相关和频谱对参数作为自适应型预测编码器和编码器的系数。 构成：分析电路37从提供给终端31的信号Sn提取预测系数，分别将其应用于发送侧的预测滤波器36和接收侧的预测滤波器45。 减法器34执行从端子31'设置的信号Sn与从加法器35发送的信号Sn'之间的减法，并将输出信号6n提供给编码器33进行量化，然后送到接收侧的解码器43，端子38 输出信号6n'通过发送侧的解码器34输出到加法器35。 加法器35将信号6n'与滤波器36的输出信号gamman相加，并将结果作为预测信号sn'给予减法器32。 解码器43的信号被加到滤波器45的输出信号，并且相加的信号作为再现信号从端子46​​输出。