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    • 6. 发明专利
    • CONFERENCE TALKING SYSTEM
    • JPS61224647A
    • 1986-10-06
    • JP6361085
    • 1985-03-29
    • HITACHI LTDNIPPON TELEGRAPH & TELEPHONE
    • KIKUCHI SUSUMUSATO HIROHIKO
    • H04M3/56
    • PURPOSE:To attain less background noise and to prevent changeover of voice sent to each subscriber from being caused frequently by selecting a subscriber having the maximum voice level not being an effective talker among subscribers sending a voice in the voice presence region and using it as the effective talker when the number of effective talkers does not reach the designated value. CONSTITUTION:A sound volume detecting circuit 7 supervises always the sound volume of each subscriber and informs the result of comparison with a threshold value of presence/absence voice designated from a microprocessor 8 in advance to the microprocessor (or the result is read by the microprocessor 8). Further, the round volume detection circuit 7 itself stores the presence/absence of voice at each subscriber and starts a timer corresponding to the subscriber provided to a timing circuit 9 as to the subscriber changing from the voice presence region into the voice absence region. The microprocessor 8 uses the information from the sound volume detection circuit 7, the information from the timing circuit 9 and the information stored in a memory 10 so as to discriminate an effective talker, a selection circuit 4 is drived, the voice signal of the effective talker is sent as it is to an adder circuit 5 and the voices of the other subscribers are not sent.
    • 8. 发明专利
    • HARDWARE/SOFTWARE INTERFACE CONTROL SYSTEM
    • JPH03211648A
    • 1991-09-17
    • JP618290
    • 1990-01-17
    • HITACHI LTD
    • OGAWA ATSUSHIKIKUCHI SUSUMUIDO NOBUHIKOHIGAKI NORITOSHI
    • G06F13/10
    • PURPOSE:To efficiently attain a specified processing in spite of the number of total peripheral equipments by temporarily transferring identification information of the specified peripheral equipment from a controller-side to the peripheral equipment, adding identification information at the time of transferring information from the peripheral equipment to the controller-side so as to return information. CONSTITUTION:A controller 1 is connected with the peripheral equipments 2 through an interface 3. The controller 1 transmits control information having an information field to which a value showing that it is the specified equipment is set to the specified peripheral equipment executing the specified processing. The specified peripheral equipment edits notice information including the information field and transmits it to the controller 1-side. Since the value that it is the specified equipment is set in the information field of the controller 1 at the time of receiving notice information, it can judge whether the specified processing is to be executed or not. Thus, a processing for referring to whether it is the specified peripheral equipment executing the specified processing or not is executed in the peripheral equipment 2 and a load by the specified processing of the controller 1 is reduced.
    • 9. 发明专利
    • MULTIPLE CALL REPEATING SYSTEM
    • JPH03177150A
    • 1991-08-01
    • JP31522689
    • 1989-12-06
    • HITACHI LTD
    • KIYOHISA HARUYOSHIKIKUCHI SUSUMUOTANI KATSUMIOTSU KAZUYUKI
    • H04M7/00H04Q11/04
    • PURPOSE:To repeat a multiple call not necessitating TSSI guarantee by a switching network against TSSI guarantee by adding the indication of the necessity/non-necessity of the TSSI guarentee to the call setting information of a subscriber, and connecting the multiple call to the switching network against the TSSI guarantee if the TSSI guarantee is not necessitated. CONSTITUTION:When a call originating subscriber 1 executes the multiple call connection for a call terminating subscriber 6, as for the call setting information sent from the subscriber at the time of call origination, TSSI guarantee necessity indication is set to transmission capacity in an information element in the case of a TSSI(Time Slot Sequence Integrity) guaranteed call, and TSSI guarantee non-necessity indication is set to the transmission capacity in the information element in the case of a TSSI non-guaranteed call. A subscriber exchange 2 analyzes the received cell setting information, and selects a transit switch and switching network to connect. Thus, in the case of the TSSI non- guaranteed call, it can be repeated by selecting the transit switch the switching network against the TSSI guarantee.