公开(公告)号：JPS63246945A

公开(公告)日：1988-10-13

申请号：JP7962487

申请日：1987-04-02

Applicant: TOSHIBA CORP

Inventor： UNO SHINTARO ,  NAKAMURA MAKOTO

Abstract: PURPOSE:To accurately verify the system information of each node in a short time by applying multiple address transmission for system information of a node to other node and receiving the result of comparison of system information of other node from other node. CONSTITUTION:In applying multiple address transmission for system information to other node, other node verifies the system information of one node. The result of comparison between the sent system information and the system information of other node is received to discriminate whether or not the system information of its own node is correct. Moreover, when it is discriminated that the information of the transmission node is correct, the correction of data is instructed to a node sending the result of comparison noncoincident with the sent node so as to correct the erroneous system information of other node. Furthermore, when it is discriminated that the sent data is not correct, the transmission right is transferred to the node sending the result of comparison noncoincident with the sent node to allow the other node to send the correct system information with high probability.

公开(公告)号：JPS621331A

公开(公告)日：1987-01-07

申请号：JP13890385

申请日：1985-06-27

Applicant: TOSHIBA CORP

Inventor： UNO SHINTARO ,  NAKAMURA MAKOTO

IPC: H04B7/14

Abstract: PURPOSE:To decrease the connecting time of a call even at link busy state by reserving a generated call even when all lines are closed and allocating an idle line to the said call just after one of the lines is idle. CONSTITUTION:When a station 2 being a calling earth station requests the assignment of an idle line to a station 1 being a centralized control station via a satellite for simultaneous communication, the station 2 sends a line assignment request signal (x). When no idle line exists in the station 1, the call corresponding to the signal (x) is reserved. When calls (y, z) to general communication are sent from other station 2, they arrive at times t3, t4. When one of operating lines is finished at a time t5 and the number of the operating lines changes from N to N-1, the station 1 assigns the line to the reserved call, that is, the call sending a line assignment request signal (x) for simultaneous communication.

公开(公告)号：JPS61200720A

公开(公告)日：1986-09-05

申请号：JP4050785

申请日：1985-03-01

Applicant: TOSHIBA CORP

Inventor： NAKAMURA MAKOTO ,  SUZUKI HIDEO

IPC: H03M7/32 ,  H03M3/02 ,  H03M7/38

Abstract: PURPOSE:To operate the titled circuit as a coder or a decoder without incurring a large sized chip by adding a means attaining switching in matched with the timing of plural input signals inputted in time division. CONSTITUTION:The titled device acts like a coder to a signal inputted from the 1st input terminal 21 by setting the 1st mode setting terminal 25 to an H level and outputs a forecast code signal to the 1st output terminal 23. Further, the device acts like a decoder to a signal inputted from the input terminal 21 by setting a setting terminal 25 to an L level and outputs a decoded signal to the output terminal 23. As to the 2nd mode setting terminal 26, the operation is specified entirely the same as that of the 1st mode setting terminal 25. Thus, circuit integration is attained without remarkable increase in the chip area.

公开(公告)号：JPS6162250A

公开(公告)日：1986-03-31

申请号：JP18491584

申请日：1984-09-04

Applicant: Nippon Telegr & Teleph Corp ,  Toshiba Corp

Inventor： KATO SHUZO ,  UNO SHINTARO ,  NAKAMURA MAKOTO ,  SUZUKI HIDEO

IPC: H04J1/05 ,  H04J4/00

CPC classification number: H04J4/005

Abstract: PURPOSE:To reduce a hardware by applying a common modulator-demodulator circuit using a digital transmultiplexer for inserting a converting circuit, which converts a sampling frequency. CONSTITUTION:A FDM (frequency division multi) signal is sampled by an A/D converter 2 and converted into a digital signal. The FDM signal converted to the digital signal is inputted to a digital transmultiplexer 3 and converted into a time division multi (TDM signal). The digital transmultiplexer 3 channel- separates the inputted FDM signal. Furthermore, after the FDM signal is converted into a based band signal, it is taken as a TDM signal by sampling each channel signal, inputted to an interpolation orthogonalized filter 4, led to a demodulating circuit 5 and a data signal of the plural number of the original channel is demodulated and regenerated.

Abstract translation: 目的：通过使用数字多路复用器应用通用调制解调器电路来插入转换采样频率的转换电路来减少硬件。 构成：FDM（分频多路）信号由A / D转换器2采样并转换为数字信号。 被转换为数字信号的FDM信号被输入到数字多路复用器3并转换成时分多路复用（TDM信号）。 数字多路复用器3通道分离输入的FDM信号。 此外，在将FDM信号转换为基带信号之后，通过对输入到内插正交滤波器4的每个信道信号进行采样，将其作为TDM信号，将其解调电路5和数个多个 原始信道被解调和再生。

公开(公告)号：JPH0969884A

公开(公告)日：1997-03-11

申请号：JP22538695

申请日：1995-09-01

Applicant: TOSHIBA CORP

Inventor： CHINO TETSURO ,  NAKAMURA MAKOTO ,  SHIMOMORI HIROSHI ,  IKEDA TOMOO ,  HATTORI HIROSHI ,  TAKEDA NOBUYUKI ,  IKEGAMI FUMIHIKO ,  SUZUKI KAORU ,  MATSUDA NATSUKO

IPC: G06F15/00 ,  G06F13/00 ,  H04B7/24 ,  H04L12/18 ,  H04M9/00

Abstract: PROBLEM TO BE SOLVED: To enable a smooth and efficient conference support by providing a control means controlling the sound output of an output means and outputting the information from an input means or a communication means from the communication means on a terminal equipment. SOLUTION: A terminal equipment Tn is composed of an input part 1, a communication part 2, a control part 3 and an output part 4. The input part 1 of these parts collects sound signals such as the utterance of the user of the terminal equipment, ambient noise or the outputted sound from another terminal equipment and transmits the signals as sound input information to a control part 3. A communication part 2 is a communication means having a transmission/reception circuit for performing a radio transmission, autonomously links with a communication line with another terminal and establishes a communication path. Inter-terminal communication information transmitted form another terminal equipment is received, the information is delivered to the control part 3 of a self-terminal equipment. Or, based on the control of this control part 3, sound input information, etc., is transmitted to the other equipment even if an input is performed from the input part 1.

公开(公告)号：JPH0787143A

公开(公告)日：1995-03-31

申请号：JP22481193

申请日：1993-09-09

Applicant: TOSHIBA CORP

Inventor： MATSUSHIMA TOMOKO ,  NAKAMURA MAKOTO

IPC: H03M13/00 ,  H04L27/18

Abstract: PURPOSE:To improve reliability and to reduce envelope variance by removing corresponding values of phases, which are shifted from the phase selected by a modulating means by about 180 deg. or 0 deg., from continuously given values. CONSTITUTION:Two bits of transmission information are supplied to an r=2/log27 trellis encoding part 3. The encoding part 3 adds a redundancy to transmission information and supplies 7 values (three bits) to art 8 value differential encoder 5. At this time, data supplied to the encoder 5 is 7 values 0 to 7 except 4. The encoder 5 calculates the sum of modulus 8 between data outputted as the preceding conversion value and next supply data from the encoding part 3 and supplies it to a BPSK modulator 7, and 8 phases are selected in accordance with data from the encoder 5, and the signal modulated by these phases is outputted. Consequently, the variance in amplitude of the envelope is reduced, and the reliability of transmission information is improved because Viterbi decoding corresponding to trellis encoding is performed at the time of demodulation.

公开(公告)号：JPH05335973A

公开(公告)日：1993-12-17

申请号：JP16046792

申请日：1992-06-19

Applicant: TOSHIBA CORP

Inventor： KODAMA TOMOKO ,  NAKAMURA MAKOTO

IPC: H04L25/08 ,  H03M13/23 ,  H03M13/12

Abstract: PURPOSE:To reduce a decoding delay time without deteriorating a decoding rate by using at least one data among data inputted newly to each shift register and selecting a survival path this time. CONSTITUTION:A branch metric calculation circuit 9 calculates a branch metric of reception signals r0, r1 received from an input terminal 8 and outputs it to an ACS circuit 10. The ACS circuit 10 selects a maximum likelihood path able to be transited to each state from the path metric calculated by the accumulation of the branch metrics. When a survival path is revised, a Viterbi decoder does not use oldest bit able to be designated when the state is transited as a bit added newly for the revision of the survival path but uses a new bit. Thus, the decoding delay time is reduced more than that of a conventional decoder. A decoding delay time is made equal to a stop length by using a bit at a location representing newest information especially in the coder among bits expressing the state of the transit destination.

公开(公告)号：JPH04165831A

公开(公告)日：1992-06-11

申请号：JP29073990

申请日：1990-10-30

Applicant: TOSHIBA CORP

Inventor： NAKAMURA MAKOTO ,  BABA SHINICHI ,  TOMIOKA TAZUKO

IPC: H04J1/08

Abstract: PURPOSE:To improve a frequency using efficiency without complexing a transmitter and a receiver by making the muximum frequency shift width of a carrier wave in each channel bigger than the frequency interval of the carrier wave between the respective channels. CONSTITUTION:From respective light transmitters 10 of ch.1-ch.n, an optical carrier wave which is frequency-modulated is outputted by an information signal, and synthesized and frequency-multiplexed by a coupler 11, then transmitted by a fiber 12. The information transferring velocity of each channel is defined as an R, and the frequency interval of each channel is defined as the 2 times frequency interval of, for example, an occupied band width decided based on the occupied band width as a reference. At this time, when setting an intermediate frequency fIF as a 3R, an image frequency interference is not generated, and a good reception can be done. Thus, without complexing the transmitter and the receiver, it is possible to set the maximum frequency shift width comparatively widely, and to improve the frequency using efficiency by optimizing the relation with the frequency interval of the carrier wave as well.

公开(公告)号：JPH02312338A

公开(公告)日：1990-12-27

申请号：JP13428089

申请日：1989-05-26

Applicant: TOSHIBA CORP

Inventor： NAKAMURA MAKOTO ,  BABA SHINICHI ,  KODAMA TOMOKO

IPC: H04L27/34 ,  H04L27/36

Abstract: PURPOSE:To suppress the mean distortion of a reproducing analog signal by employing such methed to conform a signal obtained by digitizing an analog signal to a bit string representing the signal point of a multivalue modulation signal that a bit with low reproducing distorion sensitivity in a digital signal is allocated to a bit with a high mean error rate in the bit string. CONSTITUTION:An information source encoder circuit 11 inputs the analog signal 100, and outputs the digital signal 110, and a serial-parallel conversion circuit 12 converts the digital signal 110 into a two-bit parallel signal 120 at every n bits. A sequence conversion circuit 13 receives the parallel signal 120 of n bits, and performs the replacement of sequence of the bit based on a prescribed rule. In other words, as the method to respond the digital signal 110 to the bit string representing the signal point of the multivalue modulation signal, such method that the sequence of the signal is converted so as to allocate the bit with the low reproducing distortion sensitivity in the digital signal 110 to the bit with the high mean error rate in the bit string, is employed. Thereby, it is possible to keep the distortion of a reproducing analog voice signal due to a frequently generated transmission error at a low level.

公开(公告)号：JPH01289341A

公开(公告)日：1989-11-21

申请号：JP11830388

申请日：1988-05-17

Applicant: TOSHIBA CORP

Inventor： SAKAKIBARA KATSUMI ,  NAKAMURA MAKOTO

IPC: H04L1/18

Abstract: PURPOSE:To improve the transmission efficiency and to reduce the probability of dead lock state at the sender side by sending a new data packet of a number corresponding to the difference between data packet number and retransmission packet number constituting one frame in succession to the retransmission packet. CONSTITUTION:A transmission station 1 has a means constituting a prescribed number of data packets as one frame and sending new data packets of a number corresponding to a difference between the retransmission packet number and the data packet number constituting one frame in succession to the retransmission packet. A reception station 2 has a means identifying whether a series of reception signals from the transmission station is the retransmission packet or the new data packet and a means correcting an error included in one frame packet sent by the retransmission packet obtained by the identification means. Thus, number of data packets is increased substantially without increasing the data length of the data packet. Thus, the communication transmission efficiency is improve and the probability of being in dead lock at the sender station side is reduced.