Cordless telephone

Claim 2

In a cordless telephone of multi-channel access (MCA) type comprising a master station and a plurality of remote stations, and in which said master station includes a plurality of sets of transmitting and receiving circuits, and communication and control channels are simultaneously opened between said master station and said remote stations: said master station further including memory means, means for causing one of said receiving circuits to sequentially scan said communication channels and to provide data indicating each vacant communication channel, means for storing said data as vacant channel information in said memory means, means for inhibiting storage of said vacant channel information in said memory means in the event that opening of a channel by the respective vacant communication channel between said master and remote stations would subject another of said communication and control channels to cross modulation disturbance, and means for selecting a vacant communication channel for opening between said master and remote stations only from among the communication channels indicated to be vacant by said vacant channel information actually stored in said memory means.

Claim 3

In a cordless telephone of multi-channel access (MCA) type comprising a master station and a plurality of remote stations, and in which said master station includes a plurality of sets of transmitting and receiving circuits, and communication channels are simultaneously opened between said master station and said remote stations: said master station further including memory means, means for causing one of said receiving circuits to sequentially scan said communication channels and to provide data indicating each vacant communication channel, means for storing said data as vacant channel information in said memory means, means for inhibiting storage of said vacant channel information in said memory means in the event that opening of a channel by the respective vacant communication channel between said master and remote stations would subject another of said communication channels to cross modulation disturbance, and means for selecting a vacant communication channel for opening between said master and remote stations only from among the communication channels indicated to be vacant by said vacant channel information actually stored in said memory means.

Claim 4

In a cordless telephone of multi-channel access (MCA) type comprising a master station and a plurality of remote stations, and in which said master station includes a plurality of sets of transmitting and receiving circuits, and communication channels are simultaneously opened between said master station and said remote stations: said master station further including memory means, means for causing one of said receiving circuits to sequentially scan said communication channels and to provide data indicating each vacant communication channel, means for storing said data as vacant channel information in said memory means, means for inhibiting storage of said vacant channel information in said memory means in the event that opening of a channel by the respective vacant communication channel between said master and remote stations would subject another of said communication channels to cross modulation disturbance, and means for selecting a vacant communication channel for opening between said master and remote stations only from among the communication channels indicated to be vacant by said vacant channel information actually stored in said memory means.

Claim 5

In a cordless telephone of multi-channel access (MCA) type comprising a master station and a plurality of remote stations, and in which said master station includes a plurality of sets of transmitting and receiving circuits, and communication and control channels are simultaneously opened between said master station and said remote stations: said master station further including memory means, means for causing one of said receiving circuits to sequentially scan said communication channels and to provide data indicating each vacant communication channel, means for storing said data as vacant channel information in said memory means, means for inhibiting storage of said vacant channel information in said memory means in the event that opening of a channel by the respective vacant communication channel between said master and remote stations would subject said control channel to cross modulation disturbance, and means for selecting a vacant communication channel for opening between said master and remote stations only from among the communication channels indicated to be vacant by said vacant channel information actually stored in said memory means.

Claim 6

In a cordless telephone of multi-channel access (MCA) type comprising a master station and a plurality of remote stations, and in which said master station includes a plurality of sets of transmitting and receiving circuits, and communication and control channels are simultaneously opened between said master station and said remote stations: said master station further including memory means, means for causing one of said receiving circuits to sequentially scan said communication channels and to provide data indicating each vacant communication channel, means for storing said data as vacant channel information in said memory means, means for inhibiting storage of said vacant channel information in said memory means in the event that opening of a channel by the respective vacant communication channel between said master and remote stations would subject said control channel to cross modulation disturbance, and means for selecting a vacant communication channel for opening between said master and remote stations only from among the communication channels indicated to be vacant by said vacant channel information actually stored in said memory means.

Claim 7

In a cordless telephone of multi-channel access (MCA) type comprising a master station and a plurality of remote stations, and in which said master station includes a plurality of sets of transmitting and receiving circuits, and communication and control channels are simultaneously opened between said master station and said remote stations: said master station further including a computer having memory means and being programmed for causing one of said receiving circuits to sequentially scan said communication channels and to provide data indicating each vacant communication channel, for storing said data as vacant channel information in said memory means, for inhibiting storage of said vacant channel information in said memory means in the event that opening of a channel by the respective vacant communication channel between said master and remote stations would subject another of said communication and control channels to cross modulation disturbance, and for selecting a vacant communication channel for opening between said master and remote stations only from among the communication channels indicated to be vacant by said vacant channel information actually stored in said memory means.

Claim 8

In a cordless telephone of multi-channel access (MCA) type comprising a master station and a plurality of remote stations, and in which said master station includes a plurality of sets of transmitting and receiving circuits, and communication and control channels are simultaneously opened between said master station and said remote stations: said master station further including a computer having memory means and being programmed for causing one of said receiving circuits to sequentially scan said communication channels and to provide data indicating each vacant communication channel, for storing said data as vacant channel information in said memory means, for inhibiting storage of said vacant channel information in said memory means in the event that opening of a channel by the respective vacant communication channel between said master and remote stations would subject another of said communication and control channels to cross modulation disturbance, and for selecting a vacant communication channel for opening between said master and remote stations only from among the communication channels indicated to be vacant by said vacant channel information actually stored in said memory means.

Claim 9

In a cordless telephone of multi-channel access (MCA) type comprising a master station and a plurality of remote stations, and in which said master station includes four sets of transmitting and receiving circuits, and communication and control channels are simultaneously opened between said master station and said remote stations: said master station further including means for causing one of said receiving circuits to sequentially scan said communication channels and to provide data indicating each vacant communication channel; memory means having four areas for the storage of vacant channel information in respect to four vacant communication channels and four areas for the storage of data identifying opened communication channels; means for storing said data as vacant channel information in said memory means; means for inhibiting storage of said vacant channel information in said memory means in the event that opening of a channel by the respective vacant communication channel between said master and remote stations would subject another of said communication and control channels to cross modulation disturbance, the storage of vacant channel information in said memory means is inhibited whenever the frequency f of the respective vacant communication channel satisfies any of the following conditions: Condition (1)--The frequency f is equal to any one of the frequencies f e1 , f e2 , f e3 and f e4 of communication channels identified by vacant channel information stored in the respective four areas of said memory means, and of the frequencies f u1 , f u2 , f u3 and f u4 of opened communication channels identified by data stored in the respective areas of said memory means; Condition (2)--The frequency f satisfies any one of the following equalities f+(f-f.sub.ei)=fs f+(f-f.sub.uj)=fs f.sub.ei -(f-f.sub.ei)=fs f.sub.uj -(f-f.sub.uj)=fs in which f s represents any one of the frequencies f e1 -f e4 and f u1 -f u4 , and each of i and j in an integer from 1 to 4; and Condition (3)--The frequency f satisfies any one of the following qualities f+(f-f.sub.ei)=fc f+(f-f.sub.uj)=fc f.sub.ei -(f-f.sub.ei)=fc f.sub.ej -(f-f.sub.uj)=fc in which f c represents the frequency of said control channel; and means for selecting a vacant communication channel for opening between said master and remote stations only from among the communication channels indicated to be vacant by said vacant channel information actually stored in said memory means.

Claim 10

In a cordless telephone of multi-channel access (MCA) type comprising a master station and a plurality of remote stations, and in which said master station includes four sets of transmitting and receiving circuits, and communication and control channels are simultaneously opened between said master station and said remote stations: said master station further including means for causing one of said receiving circuits to sequentially scan said communication channels and to provide data indicating each vacant communication channel; memory means having four areas for the storage of vacant channel information in respect to four vacant communication channels and four areas for the storage of data identifying opened communication channels; means for storing said data as vacant channel information in said memory means; means for inhibiting storage of said vacant channel information in said memory means in the event that opening of a channel by the respective vacant communication channel between said master and remote stations would subject another of said communication and control channels to cross modulation disturbance, the storage of vacant channel information in said memory means is inhibited whenever the frequency f of the respective vacant communication channel satisfies any of the following conditions: Condition (1)--The frequency f is equal to any one of the frequencies f e1 , f e2 , f e3 and f e4 of communication channels identified by vacant channel information stored in the respective four areas of said memory means, and of the frequencies f u1 , f u2 , f u3 and f u4 of opened communication channels identified by data stored in the respective areas of said memory means; Condition (2)--The frequency f satisfies any one of the following equalities f+(f-f.sub.ei)=fs f+(f-f.sub.uj)=fs f.sub.ei -(f-f.sub.ei)=fs f.sub.uj -(f-f.sub.uj)=fs in which f s represents any one of the frequencies f e1 -f e4 and f u1 -f u4 , and each of i and j in an integer from 1 to 4; and Condition (3)--The frequency f satisfies any one of the following qualities f+(f-f.sub.ei)=fc f+(f-f.sub.uj)=fc f.sub.ei -(f-f.sub.ei)=fc f.sub.ej -(f-f.sub.uj)=fc in which f c represents the frequency of said control channel; and means for selecting a vacant communication channel for opening between said master and remote stations only from among the communication channels indicated to be vacant by said vacant channel information actually stored in said memory means.

Claim 11

In a cordless telephone of multi-channel access (MCA) type comprising a master station and a plurality of remote stations, and in which said master station includes n sets of transmitting and receiving circuits, and communication and control channels are simultaneously opened between said master station and said remote stations: said master station further including, means for causing one of said receiving circuits to sequentially scan said communication channels and to provide data indicating each vacant communication channel; memory means having n areas for the storage of vacant channel information and n areas for the storage of data identifying n opened communication channels; means for storing said data as vacant channel information in said memory means, means for inhibiting storage of said vacant channel information in said memory means in the event that opening of a channel by the respective vacant communication channel between said master and remote stations would subject another of said communications and control channels to cross modulation disturbance, the storage of vacant channel information in said memory means is inhibited whenever the frequency f of the respective vacant communication channel satisfies any of the following conditions: Condition (1)--The frequency f is equal to any one of the frequencies f ei -f en of communication channels identified by vacant channel information stored in the respective n areas of said memory means, and of the frequencies f ui -f un of opened communication channels identified by data stored in the respective n areas of said memory means; Condition (2)--The frequency f satisfies any one of the following equalities f+(f-f.sub.ei)=fs f+(f-f.sub.uj)=fs f.sub.ei -(f-f.sub.ei)=fs f.sub.uj -(f-f.sub.uj)=fs in which f s represents any one of the frequencies f ei -f en and f ui -f un , and each of i and j in an integer from l to n; and Condition (3)--The frequency f satisfies any one of the following equalities f+(f-f.sub.ei)=fc f+(f-f.sub.uj)=fc f.sub.ei -(f-f.sub.ei)=fc f.sub.ej -(f-f.sub.uj)=fc in which f c represents the frequency of said control channel; and means for selecting a vacant communication channel for opening between said master and remote stations only from among the communication channels indicated to be vacant by said vacant channel information actually stored in said memory means.

Claim 12

In a cordless telephone of multi-channel access (MCA) type comprising a master station and a plurality of remote stations, and in which said master station includes n sets of transmitting and receiving circuits, and communication and control channels are simultaneously opened between said master station and said remote stations: said master station further including, means for causing one of said receiving circuits to sequentially scan said communication channels and to provide data indicating each vacant communication channel; memory means having n areas for the storage of vacant channel information and n areas for the storage of data identifying n opened communication channels; means for storing said data as vacant channel information in said memory means, means for inhibiting storage of said vacant channel information in said memory means in the event that opening of a channel by the respective vacant communication channel between said master and remote stations would subject another of said communications and control channels to cross modulation disturbance, the storage of vacant channel information in said memory means is inhibited whenever the frequency f of the respective vacant communication channel satisfies any of the following conditions: Condition (1)--The frequency f is equal to any one of the frequencies f ei -f en of communication channels identified by vacant channel information stored in the respective n areas of said memory means, and of the frequencies f ui -f un of opened communication channels identified by data stored in the respective n areas of said memory means; Condition (2)--The frequency f satisfies any one of the following equalities f+(f-f.sub.ei)=fs f+(f-f.sub.uj)=fs f.sub.ei -(f-f.sub.ei)=fs f.sub.uj -(f-f.sub.uj)=fs in which f s represents any one of the frequencies f ei -f en and f ui -f un , and each of i and j in an integer from l to n; and Condition (3)--The frequency f satisfies any one of the following equalities f+(f-f.sub.ei)=fc f+(f-f.sub.uj)=fc f.sub.ei -(f-f.sub.ei)=fc f.sub.ej -(f-f.sub.uj)=fc in which f c represents the frequency of said control channel; and means for selecting a vacant communication channel for opening between said master and remote stations only from among the communication channels indicated to be vacant by said vacant channel information actually stored in said memory means.

Claim 13

In a cordless telephone of multi-channel access (MCA) type comprising a master station and a plurality of remote stations, and in which said master station includes n sets of transmitting and receiving circuits, and communication channels are simultaneously opened between said master station and said remote stations: said master station further including, means for causing one of said receiving circuits to sequentially scan said communication channels and to provide data indicating each vacant communication channel; memory means having n areas for the storage of vacant channel information and n areas for the storage of data identifying n opened communication channels; means for storing said data as vacant channel information in said memory means; means for inhibiting storage of said vacant channel information in said memory means in the event that opening of a channel by the respective vacant communication channel between said master and remote stations would subject another of said communication channels to cross modulation disturbance, the storage of vacant channel information in said memory means is inhibited whenever the frequency f of the respective vacant communication channel satisfies any of the following conditions: Condition (1)--The frequency f is equal to any one of the frequencies f ei -f en of communication channels identified by vacant channel information stored in the respective n areas of said memory means, and of the frequencies f ui -f un of opened communication channels identified by data stored in the respective n areas of said memory means; Condition (2)--The frequency f satisfies any one of the following equalities f+(f-f.sub.ei)=fs f+(f-f.sub.uj)=fs f.sub.ei -(f-f.sub.ei)=fs f.sub.uj -(f-f.sub.uj)=fs in which f s represents any one of the frequencies f ei -f en and f ui -f un , and each of i and j in an integer from 1 to n; and means for selecting a vacant communication channel for opening between said master and remote stations only from among the communication channels indicated to be vacant by said vacant channel information actually stored in said memory means.

Claim 14

In a cordless telephone of multi-channel access (MCA) type comprising a master station and a plurality of remote stations, and in which said master station includes n sets of transmitting and receiving circuits, and communication channels are simultaneously opened between said master station and said remote stations: said master station further including, means for causing one of said receiving circuits to sequentially scan said communication channels and to provide data indicating each vacant communication channel; memory means having n areas for the storage of vacant channel information and n areas for the storage of data identifying n opened communication channels; means for storing said data as vacant channel information in said memory means; means for inhibiting storage of said vacant channel information in said memory means in the event that opening of a channel by the respective vacant communication channel between said master and remote stations would subject another of said communication channels to cross modulation disturbance, the storage of vacant channel information in said memory means is inhibited whenever the frequency f of the respective vacant communication channel satisfies any of the following conditions: Condition (1)--The frequency f is equal to any one of the frequencies f ei -f en of communication channels identified by vacant channel information stored in the respective n areas of said memory means, and of the frequencies f ui -f un of opened communication channels identified by data stored in the respective n areas of said memory means; Condition (2)--The frequency f satisfies any one of the following equalities f+(f-f.sub.ei)=fs f+(f-f.sub.uj)=fs f.sub.ei -(f-f.sub.ei)=fs f.sub.uj -(f-f.sub.uj)=fs in which f s represents any one of the frequencies f ei -f en and f ui -f un , and each of i and j in an integer from 1 to n; and means for selecting a vacant communication channel for opening between said master and remote stations only from among the communication channels indicated to be vacant by said vacant channel information actually stored in said memory means.

Claim 15

In a cordless telephone of multi-channel access (MCA) type comprising a master station and a plurality of remote stations, and in which said master station includes n sets of transmitting and receiving circuits, and communication and control channels are simultaneously opened between said master station and said remote stations: said master station further including, means for causing one of said receiving circuits to sequentially scan said communication channels and to provide data indicating each vacant communication channel; memory means having n areas for the storage of vacant channel information and n areas for the storage of data identifying n opened communication channels, means for storing said data as vacant channel information in said memory means; means for inhibiting storage of said vacant channel information in said memory means in the event that opening of a channel by the respective vacant communication channel between said master and remote stations would subject said control channel to cross modulation disturbance, the storage of vacant channel information in said memory means is inhibited whenever the frequency f of the respective vacant communication channel satisfies any of the following conditions: Condition (1)--The frequency f is equal to any one of the frequencies f ei -f en of communication channels identified by vacant channel information stored in the respective n areas of said memory means, and of the frequencies f ui -f un of opened communication channels identified by data stored in the respective n areas of said memory means; and Condition (2)--The frequency f satisfies any one of the following equalities f+(f-f.sub.ei)=fc f+(f-f.sub.uj)=fc f.sub.ei -(f-f.sub.ei)=fc f.sub.uj -(f-f.sub.uj)=fc in which f c represents the frequencies of said control channel, and each of i and j is an integer from 1 to n; and means for selecting a vacant communication channel for opening between said master and remote stations only from among the communication channels indicated to be vacant by said vacant channel information actually stored in said memory means.

Claim 16

In a cordless telephone of multi-channel access (MCA) type comprising a master station and a plurality of remote stations, and in which said master station includes n sets of transmitting and receiving circuits, and communication and control channels are simultaneously opened between said master station and said remote stations: said master station further including, means for causing one of said receiving circuits to sequentially scan said communication channels and to provide data indicating each vacant communication channel; memory means having n areas for the storage of vacant channel information and n areas for the storage of data identifying n opened communication channels, means for storing said data as vacant channel information in said memory means; means for inhibiting storage of said vacant channel information in said memory means in the event that opening of a channel by the respective vacant communication channel between said master and remote stations would subject said control channel to cross modulation disturbance, the storage of vacant channel information in said memory means is inhibited whenever the frequency f of the respective vacant communication channel satisfies any of the following conditions: Condition (1)--The frequency f is equal to any one of the frequencies f ei -f en of communication channels identified by vacant channel information stored in the respective n areas of said memory means, and of the frequencies f ui -f un of opened communication channels identified by data stored in the respective n areas of said memory means; and Condition (2)--The frequency f satisfies any one of the following equalities f+(f-f.sub.ei)=fc f+(f-f.sub.uj)=fc f.sub.ei -(f-f.sub.ei)=fc f.sub.uj -(f-f.sub.uj)=fc in which f c represents the frequencies of said control channel, and each of i and j is an integer from 1 to n; and means for selecting a vacant communication channel for opening between said master and remote stations only from among the communication channels indicated to be vacant by said vacant channel information actually stored in said memory means.

Claim 17

In a cordless telephone of multi-channel access (MCA) type comprising a master station and a plurality of remote stations, and in which said master station includes n sets of transmitting and receiving circuits, and communication and control channels are simultaneously opened between said master station and said remote stations: said master station further including a computer being programmed for causing one of said receiving circuits to sequentially scan said communication channels and to provide data indicating each vacant communication channel, said computer having memory means with n areas for the storage of vacant channel information and n areas for the storage of data identifying n opened communication channels; for storing said data as vacant channel information in said memory means, for inhibiting storage of said vacant channel information in said memory means in the event that opening of a channel by the respective vacant communication channel between said master and remote stations would subject another of said communication and control channels to cross modulation disturbance, the storage of vacant channel information in said memory means is inhibited whenever the frequency f of the respective vacant communication channel satisfies any of the following conditions: Condition (1)--The frequency f is equal to any one of the frequencies f ei -f en of communication channels identified by vacant channel information stored in the respective n areas of said memory means, and of the frequencies f ui -f un of opened communication channels identified by data stored in the respective n areas of said memory means; Condition (2)--The frequency f satisfies any one of the following equalities f+(f-f.sub.ei)=fs f+(f-f.sub.uj)=fs f.sub.ei -(f-f.sub.ei)=fs f.sub.uj -(f-f.sub.uj)=fs in which f s represents any one of the frequencies f ei -f en and f ui -f un , and each of i and j in an integer from 1 to n; and Condition (3)--The frequency f satisfies any one of the following equalities f+(f-f.sub.ei)=fc f+(f-f.sub.uj)=fc f.sub.ei -(f-f.sub.ei)=fc f.sub.ej -(f-f.sub.uj)=fc in which f c represents the frequency of said control channel; and for selecting a vacant communication channel for opening between said master and remote stations only from among the communication channels indicated to be vacant by said vacant channel information actually stored in said memory means.

Claim 18

In a cordless telephone of multi-channel access (MCA) type comprising a master station and a plurality of remote stations, and in which said master station includes n sets of transmitting and receiving circuits, and communication and control channels are simultaneously opened between said master station and said remote stations: said master station further including a computer being programmed for causing one of said receiving circuits to sequentially scan said communication channels and to provide data indicating each vacant communication channel, said computer having memory means with n areas for the storage of vacant channel information and n areas for the storage of data identifying n opened communication channels; for storing said data as vacant channel information in said memory means, for inhibiting storage of said vacant channel information in said memory means in the event that opening of a channel by the respective vacant communication channel between said master and remote stations would subject another of said communication and control channels to cross modulation disturbance, the storage of vacant channel information in said memory means is inhibited whenever the frequency f of the respective vacant communication channel satisfies any of the following conditions: Condition (1)--The frequency f is equal to any one of the frequencies f ei -f en of communication channels identified by vacant channel information stored in the respective n areas of said memory means, and of the frequencies f ui -f un of opened communication channels identified by data stored in the respective n areas of said memory means; Condition (2)--The frequency f satisfies any one of the following equalities f+(f-f.sub.ei)=fs f+(f-f.sub.uj)=fs f.sub.ei -(f-f.sub.ei)=fs f.sub.uj -(f-f.sub.uj)=fs in which f s represents any one of the frequencies f ei -f en and f ui -f un , and each of i and j in an integer from 1 to n; and Condition (3)--The frequency f satisfies any one of the following equalities f+(f-f.sub.ei)=fc f+(f-f.sub.uj)=fc f.sub.ei -(f-f.sub.ei)=fc f.sub.ej -(f-f.sub.uj)=fc in which f c represents the frequency of said control channel; and for selecting a vacant communication channel for opening between said master and remote stations only from among the communication channels indicated to be vacant by said vacant channel information actually stored in said memory means.