US5467367A
Expired / Lapsed
US
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Spread spectrum communication apparatus and telephone exchange system
Assignee: Canon Inc
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Filing: 1994-06-13
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Granted: 1995-11-14
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Expires: 2014-06-13
Abstract
Abstract A telephone exchange system of this invention has a terminal connected to an extension by radio. As a radio communication modulation method, a spread spectrum method is used. A speech signal received from a line by the telephone exchange system is exchanged by an exchange switch, and is supplied to a data conversion unit. The data conversion unit causes a serial/parallel converter to covert a serial input signal into a parallel signal. The converted parallel signal is subjected to spread-spectrum modulation in units of parallel bits. The modulated signal bits are added to each other by an adder, and the sum signal is multiplexed on a carrier signal. The multiplexed signal is transmitted to the terminal. Upon reception of the signal, the terminal causes a phase synchronization circuit to generate an inverse spread code corresponding to a spread code, and synchronized with the reception signal, and inversely spreads the reception signal using the generated inverse spread code. The inversely spread signal is converted into a serial signal by a parallel/serial converter, i.e., is demodulated into a speech signal. When a signal is transmitted from the terminal, the said procedure as described above is executed in the opposite direction.
Inventors
- 👤 Michihiro Izumi
- 👤 Kazunari Watanabe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 07:46
CPC Classifications
H; H04; H04J; H04J13/00; H04J13/10; H04B; H04B1/00; H04B1/69; H04J13/0077
Claims Analysis
Total Claims: 52
Claim 1
Independent Claim
72 words
A spread spectrum communication apparatus comprising: generation means for generating a plurality of different spread codes in parallel; modulation means for modulating transmission information of parallel bits using the plurality of spread codes generated by said generation means; and transmission means for transmitting the transmission information modulated by said modulation means, wherein said modulation means modulates each bit of the parallel bits using each of the plurality of spread codes in parallel.
Claim 2
Dependent Claim
72 words
A spread spectrum communication apparatus comprising: generation means for generating a plurality of different spread codes in parallel; modulation means for modulating transmission information of parallel bits using the plurality of spread codes generated by said generation means; and transmission means for transmitting the transmission information modulated by said modulation means, wherein said modulation means modulates each bit of the parallel bits using each of the plurality of spread codes in parallel.
Claim 3
Dependent Claim
42 words
The apparatus according to claim 1, wherein said generation means comprises a plurality of delay means having different delay times, and supplies a common spread code to said plurality of delay means to generate a plurality of spread codes having different phases.
Claim 4
Dependent Claim
43 words
The apparatus according to claim 1, wherein said generation means further generates a synchronization spread code, and said transmission means multiplies the signal accumulated by said accumulation means with the synchronization spread code generated by said generation means, and transmits the product signal.
Claim 5
Dependent Claim
27 words
The apparatus according to claim 3, wherein said generation means generates the synchronization spread code having the same length as that of the plurality of spread codes.
Claim 6
Dependent Claim
30 words
The apparatus according to claim 1, further comprising conversion means for converting serial data into parallel data, and wherein said modulation means modulates parallel data converted by said conversion means.
Claim 7
Dependent Claim
23 words
The apparatus according to claim 1, further comprising conversion means for converting serial transmission information into the transmission information of the parallel bits.
Claim 8
Dependent Claim
60 words
A spread spectrum communication apparatus comprising: reception means for receiving a reception signal; generation means for generating a plurality of different despread codes in parallel; demodulation means for demodulating the reception signal using the plurality of despread codes generated by said generation means, respectively; and conversion means for converting the reception signal demodulated by said demodulation means into parallel bits.
Claim 9
Dependent Claim
60 words
A spread spectrum communication apparatus comprising: reception means for receiving a reception signal; generation means for generating a plurality of different despread codes in parallel; demodulation means for demodulating the reception signal using the plurality of despread codes generated by said generation means, respectively; and conversion means for converting the reception signal demodulated by said demodulation means into parallel bits.
Claim 10
Dependent Claim
44 words
The apparatus according to claim 7, wherein said generation means comprises a plurality of delay means having different delay times, and supplies a common inverse spread code to said plurality of delay means to generate a plurality of inverse spread codes having different phases.
Claim 11
Dependent Claim
64 words
The apparatus according to claim 7, wherein said generation means comprises means for generating a synchronization spread code in synchronism with the plurality of inverse spread codes, and correlation means for checking a correlation between the synchronization spread code and a reception signal, and generates the plurality of inverse spread codes according to the correlation between the synchronization spread code and the reception signal.
Claim 12
Dependent Claim
28 words
The apparatus according to claim 9, wherein said generation means generates the synchronization spread code having the same length as that of the plurality of inverse spread codes.
Claim 13
Dependent Claim
33 words
The apparatus according to claim 7, further comprising conversion means for converting parallel data into serial data, said conversion means converting a parallel signal demodulated by said demodulation means into a serial signal.
Claim 14
Dependent Claim
88 words
A spread spectrum transmission apparatus comprising: generation means for generating a plurality of spread codes; demultiplexing means for demultiplexing transmission information, generated by multiplexing data from a plurality of channels, to data from each of the plurality of channels; spread means for spreading the data from each of the plurality of channels demultiplexed by said demultiplexing means on the basis of the plurality of spread codes generated by said generation means; and transmission means for transmitting the data from the plurality of channels spread by said spread means.
Claim 15
Dependent Claim
88 words
A spread spectrum transmission apparatus comprising: generation means for generating a plurality of spread codes; demultiplexing means for demultiplexing transmission information, generated by multiplexing data from a plurality of channels, to data from each of the plurality of channels; spread means for spreading the data from each of the plurality of channels demultiplexed by said demultiplexing means on the basis of the plurality of spread codes generated by said generation means; and transmission means for transmitting the data from the plurality of channels spread by said spread means.
Claim 16
Dependent Claim
25 words
The apparatus according to claim 12, further comprising conversion means for converting serial transmission information into the transmission information consisting of the plurality of bits.
Claim 17
Dependent Claim
16 words
The apparatus according to claim 12, wherein said demultiplexing means demultiplexes information from a digital network.
Claim 18
Dependent Claim
16 words
The apparatus according to claim 12, wherein said demultiplexing means demultiplexes information from a digital terminal.
Claim 19
Dependent Claim
78 words
A spread spectrum reception apparatus comprising: reception means for receiving a reception signal; generation means for generating a plurality of despread codes; a plurality of despread means for despreading the reception signal on the basis of the plurality of despread codes generated by said generation means, respectively; supply means for supplying the reception signal to said plurality of despread means; and conversion means for converting a plurality of outputs of the plurality of despread means into parallel data.
Claim 20
Dependent Claim
78 words
A spread spectrum reception apparatus comprising: reception means for receiving a reception signal; generation means for generating a plurality of despread codes; a plurality of despread means for despreading the reception signal on the basis of the plurality of despread codes generated by said generation means, respectively; supply means for supplying the reception signal to said plurality of despread means; and conversion means for converting a plurality of outputs of the plurality of despread means into parallel data.
Claim 21
Dependent Claim
22 words
The apparatus according to claim 16, wherein said supply means supplies the reception signal to the plurality of despread means in parallel.
Claim 22
Dependent Claim
118 words
A spread spectrum communication apparatus comprising: first generation means for generating a first spread code; a plurality of delay means for delaying the first spread code to generate a plurality of spread codes having different phases; modulation means for modulating transmission information signals of a plurality of parallel channels using the plurality of spread codes generated by said plurality of delay; accumulation means for accumulating the signals of the channels modulated by said modulation means; second generation means for generating a second spread code; multiplication means for multiplying a signal accumulated by said accumulation means with the second spread code generated by said second generation means; and transmission means for transmitting the signal multiplied by said multiplication means.
Claim 23
Dependent Claim
118 words
A spread spectrum communication apparatus comprising: first generation means for generating a first spread code; a plurality of delay means for delaying the first spread code to generate a plurality of spread codes having different phases; modulation means for modulating transmission information signals of a plurality of parallel channels using the plurality of spread codes generated by said plurality of delay; accumulation means for accumulating the signals of the channels modulated by said modulation means; second generation means for generating a second spread code; multiplication means for multiplying a signal accumulated by said accumulation means with the second spread code generated by said second generation means; and transmission means for transmitting the signal multiplied by said multiplication means.
Claim 24
Dependent Claim
99 words
A spread spectrum communication apparatus comprising: first generation means for generating a first inverse spread code; second generation means for generating a second inverse spread code; correlation means for checking a correlation between the second inverse spread code and a reception signal; third generation means for delaying the first inverse spread code according to the correlation between the second inverse spread code and the reception signal to generate a plurality of inverse spread codes having different phases; and modulation means for parallelly modulating the reception signal using the plurality of inverse spread codes generated by said third generation means.
Claim 25
Dependent Claim
99 words
A spread spectrum communication apparatus comprising: first generation means for generating a first inverse spread code; second generation means for generating a second inverse spread code; correlation means for checking a correlation between the second inverse spread code and a reception signal; third generation means for delaying the first inverse spread code according to the correlation between the second inverse spread code and the reception signal to generate a plurality of inverse spread codes having different phases; and modulation means for parallelly modulating the reception signal using the plurality of inverse spread codes generated by said third generation means.
Claim 26
Dependent Claim
86 words
A telephone exchange system having an extension connected by radio, comprising: reception means for receiving a signal from a terminal; demodulation means for despreading the signal received by said reception means to demodulate the signal into a speech signal; exchange means for exchanging the speech signal demodulated by said demodulation means; transmission means for transmitting the speech signal exchanged by said exchange means to a communication partner; and control means for controlling said exchange means on the basis of the signal received by said reception means.
Claim 27
Dependent Claim
86 words
A telephone exchange system having an extension connected by radio, comprising: reception means for receiving a signal from a terminal; demodulation means for despreading the signal received by said reception means to demodulate the signal into a speech signal; exchange means for exchanging the speech signal demodulated by said demodulation means; transmission means for transmitting the speech signal exchanged by said exchange means to a communication partner; and control means for controlling said exchange means on the basis of the signal received by said reception means.
Claim 28
Dependent Claim
21 words
The system according to claim 20, wherein said demodulation means despreads the reception signal using a plurality of inverse spread codes.
Claim 29
Dependent Claim
29 words
The system according to claim 21, wherein said demodulation means converts the data despread by the plurality of inverse spread codes into serial data, and outputs the serial data.
Claim 30
Dependent Claim
35 words
The system according to claim 21, wherein said demodulation means converts the data despread by the plurality of inverse spread codes into Alternate Mark Inversion code data, and outputs the Alternate Mark Inversion code data.
Claim 31
Dependent Claim
60 words
A telephone exchange system having an extension connected by radio, comprising: receiving means for receiving a speech signal from a communication partner; exchange means for exchanging the speech signal received by said receiving means; spread means for spreading the speech signal exchanged by said exchange means; and transmission means for transmitting the signal spread by said means to a terminal.
Claim 32
Dependent Claim
60 words
A telephone exchange system having an extension connected by radio, comprising: receiving means for receiving a speech signal from a communication partner; exchange means for exchanging the speech signal received by said receiving means; spread means for spreading the speech signal exchanged by said exchange means; and transmission means for transmitting the signal spread by said means to a terminal.
Claim 33
Dependent Claim
20 words
The system according to claim 24, wherein said transmission means spreads the speech signal using a plurality of spread codes.
Claim 34
Dependent Claim
32 words
The system according to claim 25, wherein said transmission means converts the speech signal into parallel data, and spreads channels of the parallel data using a plurality of different spread codes, respectively.
Claim 35
Dependent Claim
36 words
The system according to claim 25, wherein said transmission means demultiplexes a speech signal coded by Alternate Mark Inversion in units of channels, and spreads the demultiplexed data using different spread codes in units of channels.
Claim 36
Dependent Claim
85 words
A telephone exchange system having an extension connected by radio, comprising: reception means for receiving a signal; demodulation means for despreading the signal received by said reception means to demodulate the signal into a speech signal; exchange means for exchanging the speech signal; control means for controlling said exchange means on the basis of the signal received by said reception means; spread means for spreading the speech signal exchanged by said exchange means; and transmission means for transmitting the signal spread by said spread means.
Claim 37
Dependent Claim
85 words
A telephone exchange system having an extension connected by radio, comprising: reception means for receiving a signal; demodulation means for despreading the signal received by said reception means to demodulate the signal into a speech signal; exchange means for exchanging the speech signal; control means for controlling said exchange means on the basis of the signal received by said reception means; spread means for spreading the speech signal exchanged by said exchange means; and transmission means for transmitting the signal spread by said spread means.
Claim 38
Dependent Claim
92 words
A telephone exchange system connected to a plurality of mobile terminals by radio, comprising: selection means for selecting one of a plurality of spread codes; information means for informing the spread code selected by said selection means to one of the plurality of mobile terminals by radio; demodulation means for despreading the signal from the mobile terminal informed by said information means in accordance with the spread code selected by selection means to demodulate the signal into a speech signal; and transmission means for transmitting the speech signal to a communication partner.
Claim 39
Dependent Claim
92 words
A telephone exchange system connected to a plurality of mobile terminals by radio, comprising: selection means for selecting one of a plurality of spread codes; information means for informing the spread code selected by said selection means to one of the plurality of mobile terminals by radio; demodulation means for despreading the signal from the mobile terminal informed by said information means in accordance with the spread code selected by selection means to demodulate the signal into a speech signal; and transmission means for transmitting the speech signal to a communication partner.
Claim 40
Dependent Claim
35 words
The system according to claim 29, wherein said selection means comprises storage means for storing use conditions of the plurality of spread codes, and looks up said storage means to select an unused spread code.
Claim 41
Dependent Claim
83 words
A telephone exchange system connected to a plurality of mobile terminals by radio, comprising: selection means for selecting one of a plurality of spread codes; receiving means for receiving a speech signal from a communication partner: exchange means for exchanging the speech signal received by said receiving means; modulation means for modulating the speech signal exchanged by said exchange means in accordance with the spread code selected by said selection means; and transmission means for transmitting the signal modulated by said modulation means.
Claim 42
Dependent Claim
83 words
A telephone exchange system connected to a plurality of mobile terminals by radio, comprising: selection means for selecting one of a plurality of spread codes; receiving means for receiving a speech signal from a communication partner: exchange means for exchanging the speech signal received by said receiving means; modulation means for modulating the speech signal exchanged by said exchange means in accordance with the spread code selected by said selection means; and transmission means for transmitting the signal modulated by said modulation means.
Claim 43
Dependent Claim
57 words
A spread spectrum communication apparatus comprising: storage means for storing a plurality of sets of spread codes; selection means for selecting one set of the plurality of sets of spread codes stored in said storage means; and communication means for performing a communication on the basis of the set of spread codes selected by said selection means.
Claim 44
Dependent Claim
57 words
A spread spectrum communication apparatus comprising: storage means for storing a plurality of sets of spread codes; selection means for selecting one set of the plurality of sets of spread codes stored in said storage means; and communication means for performing a communication on the basis of the set of spread codes selected by said selection means.
Claim 45
Dependent Claim
30 words
The apparatus according to claim 32, wherein said selection means comprises reception means for receiving a selection signal for selecting one set of the plurality of sets of spread codes.
Claim 46
Dependent Claim
59 words
The apparatus according to claim 32, wherein said selection means comprises second storage means for storing data indicating whether or not each of the plurality of sets of spread codes is in use, and selects a spread code, corresponding data of which is stored in said second storage means to indicate that the spread code is not in use.
Claim 47
Dependent Claim
82 words
A spread spectrum transmission apparatus comprising: generation means for generating a plurality of different spread codes in parallel corresponding to parallel bits of transmission information; a plurality of modulation means for modulating parallel bits of transmission information using spread codes generated by said generation means; transmission means for transmitting output of said plurality of modulation means; wherein each of said plurality of modulation means modulates each bit of the parallel bits of transmission information using each of the plurality of spread codes.
Claim 48
Dependent Claim
82 words
A spread spectrum transmission apparatus comprising: generation means for generating a plurality of different spread codes in parallel corresponding to parallel bits of transmission information; a plurality of modulation means for modulating parallel bits of transmission information using spread codes generated by said generation means; transmission means for transmitting output of said plurality of modulation means; wherein each of said plurality of modulation means modulates each bit of the parallel bits of transmission information using each of the plurality of spread codes.
Claim 49
Dependent Claim
94 words
A spread spectrum communication apparatus comprising: reception means for receiving a reception signal; generation means for generating a plurality of different despread codes in parallel; demodulation means for demodulating the reception signal using the plurality of despread codes generated by said generation means, to output a plurality of demodulated signals corresponding to the plurality of despread codes; multiplexing means for multiplexing the plurality of demodulated signals demodulated by said demodulation means to output a multiplexed signal; and transmission means for transmitting the multiplexed signal multiplexed by said multiplexing means via a digital signal line.
Claim 50
Dependent Claim
94 words
A spread spectrum communication apparatus comprising: reception means for receiving a reception signal; generation means for generating a plurality of different despread codes in parallel; demodulation means for demodulating the reception signal using the plurality of despread codes generated by said generation means, to output a plurality of demodulated signals corresponding to the plurality of despread codes; multiplexing means for multiplexing the plurality of demodulated signals demodulated by said demodulation means to output a multiplexed signal; and transmission means for transmitting the multiplexed signal multiplexed by said multiplexing means via a digital signal line.
Claim 51
Dependent Claim
23 words
The apparatus according to claim 36, wherein said transmission means transmits the multiplexed signal to a digital network via the digital signal line.
Claim 52
Dependent Claim
23 words
The apparatus according to claim 36, wherein said transmission means transmits the multiplexed signal to a digital terminal via the digital signal line.
References Cited (Backward Citations)
US4225935A
Cited
US4308617A
Cited
US4392220A
Cited
US4494238A
Cited
US4635274A
Cited
US4672629A
Cited
US4759034A
Cited
US4969159A
Cited
US5204877A
Cited
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