Telephone set of distinctive ringing type wherein pattern of telephone number call signal is registered for determination of telephone number being called

DETAILED DESCRIPTION It is therefore an object of the present invention to provide a telephone set of distinctive ringing type which permits easy and correct registration of the pattern of a call signal which calls one of telephone numbers used for the telephone set.
The above object may be achieved according to one aspect of the present invention, which provides a telephone set of distinctive ringing type of a called party capable of effecting telephone communication with a remote calling party calling one of a plurality of telephone numbers, the plurality of telephone numbers being called by respective call signals having respective different patterns, the telephone set comprising: (a) a pattern data memory for storing pattern data representative of the pattern of each of at least one of the call signals which call the plurality of telephone numbers; (b) operator-controlled means for establishing a registering mode in which the pattern data representative of the pattern of the at least one call signal are stored in the pattern data memory; (c) pattern detecting means for detecting the pattern of the at least one call signal when the at least one call signal is received while the telephone set is placed in the registering mode; (d) pattern registering means, operable in the registering mode, for registering the pattern of the at least one call signal as detected by the pattern detecting means, in the pattern data memory as the pattern data in relation to the corresponding telephone number; and (e) pattern determining means, operable when the telephone set is not placed in the registering mode, for comparing the pattern of a call signal which is currently received, with each pattern represented by the pattern data stored in the pattern data memory, and thereby determining the telephone number being called by the received call signal.
In the telephone set of the present invention constructed as described above, the pattern of each of at least one call signal calling at least one telephone number is detected by the pattern detecting means while the telephone set is placed in the registering mode established by the operator-controlled means