Radio communication method and apparatus which adds an interrupt enable synchronizing signal to a compressed voice signal in place of a synchronizing A signal

• US 5,734,969 A
• Filed: 06/03/1996
• Issued: 03/31/1998
• Est. Priority Date: 06/08/1995
• Status: Expired due to Term

• Current Assignee: Hitachi Kokusai Electric Incorporated (Hitachi, Ltd.), Tohoku Electric Power Company Incorporated
• Original Assignee: Hitachi Denshi Kabushiki Kaisha, Tohoku Electric Power Company Incorporated
• Inventors: Shiraishi, Mitsuo, Ohira, Sakari
• Primary Examiner(s): Chin, Tommy P.
• Assistant Examiner(s): VINCENT, DAVID ROBERT
• Application Number:
  US08/657,080
• Time in Patent Office: 666 Days
• Field of Search: 370/277-280, 370/294, 370/282, 370/296, 370/504, 370/503, 370/522-4, 370/528, 455/54.1, 455/51.1, 455/54.2, 455/72, 455/58.1, 455/78, 455/79, 379/208, 379/58, 379/63
• US Class Current: 455/72
• CPC Class Codes: H04J 3/0602 Systems characterised by the synchronising information used

Abstract

A time-divisional duplex radio communication apparatus includes the steps of adding an interrupt enable signal to the compressed voice signal in place of the time-divisional synchronizing signal at a predetermined period in a radio communication apparatus served as a calling station, functioning the period corresponding to the time-divisional synchronizing signal as a reception period without having to add the time-divisional synchronizing signal to the compressed voice signal at the next transmission period if the interrupt enable signal from the calling station is received in a radio communication apparatus served as the called station, generating the interrupt request signal a predetermined time later than the reception of the interrupt enable signal of the calling station and transmitting the interrupt request signal in the reception periods of the calling station and the called station in a radio communication apparatus served as an interrupting station, indicating occurrence of an interrupt in response to the reception of the interrupt request signal in the radio communication apparatuses served as the calling station and the called station.

Claims

1. A radio communication apparatus for doing a substantially simultaneous communication with another station using a carrier of a single frequency, wherein a transmission period and a reception period in said apparatus are alternately set in operation, arranged to divide a voice signal into a plurality of signals with predetermined intervals, compress the divided voice signal with a predetermined rate in time axis, add a synchronizing signal to the compressed voice signal for generating a transmission signal, transmit said transmission signal within said transmission period, receive a transmission signal containing a compressed voice signal from another station within said reception period, and expand said compressed voice signal from said another station based on said synchronizing signal in time axis for reproducing an original signal, said apparatus comprising:

means for adding an interrupt enable signal to said compressed voice signal of said transmission signal in place of adding a synchronizing signal at a predetermined period;

means for receiving an interrupt enable signal contained in said transmission signal from said another station;

means for generating an interrupt request signal; and

control means for controlling so as to prohibit that said synchronizing signal is added to said compressed voice signal in the next transmission period when said interrupt enable signal is received to said received means, and for controlling so as to transmit said interrupt request signal at a predetermined time later than the reception of said interrupt enable signal.

2. A radio communication apparatus as claimed in claim 1, further comprising means for indicating occurence of an interrupt in response to the reception of said interrupt request signal.

3. A radio communication apparatus as claimed in claim 1 further comprising means for automatically stopping the transmission at a predetermined time later than the reception of said interrupt request signal from another station.

4. A radio communication apparatus as claimed in claim 1 further comprising means for effectuating only a synchronizing signal received from another station within a predetermined time window located a predetermined time later than the timing of said synchronizing signal generated by its own apparatus, and wherein said compressed voice signal from another station is expanded in time axis for reproducing an original voice signal on said effective synchronizing signal.

5. A radio communication apparatus as claimed in claim 4, wherein when said interrupt request signal is received, the compressed voice signal from another station is expanded in time axis in response to the timing of the center of said predetermined time window for reproducing an original signal.

6. A radio apparatus as claimed in claim 1, wherein the transmitting interval of said interrupt enable signal is 2t₁ ×

2ⁿ (wherein t₁ ;

transmission period, n;

0 or positive integer).

7. A radio communication method for doing a substantially simultaneous communication between two radio communication apparatuses using a carrier of a single frequency, wherein a transmission period and a reception period in said apparatus are alternately set in operation, arranged to divide a voice signal into a plurality of signals with predetermined intervals, compress the divided voice signal with a predetermined rate in time axis, add a synchronizing signal to the compressed voice signal for generating a transmission signal, transmitting said transmission signal within said transmission period, receive a transmission signal containing a compressed voice signal from another station within said reception period, and expand in time axis said compressed voice signal from said another station based on said synchronizing signal for reproducing an original signal, said method comprising the steps of:

adding an interrupt enable signal to said compressed voice signal of said transmission signal in place of adding a synchronizing signal at a predetermined period in the radio communication apparatus served as a calling station;

functioning the period corresponding to said synchronizing signal as said reception period without adding said synchronizing signal to said compressed voice signal in the next transmission period when said interrupt enable signal from said calling station is received in the radio communication apparatus served as a called station;

generating an interrupt request signal at a predetermined time later than the reception of said interrupt enable signal from said calling station and transmitting said interrupt request signal in the reception periods of said calling station and said called station in a radio communication apparatus served as an interrupting station; and

indicating occurrence of an interrupt in response to the reception of said interrupt request signal in said radio communication apparatuses.

8. A radio communication method as claimed in claim 7 further comprising the step of stopping the transmission at a predetermined time later than the reception of said interrupt request signal in said radio communication apparatuses.

9. A radio communication method as claimed in claim 7 further comprising the seep of effectuating only a synchronizing signal received from said called station within a predetermined time window located a predetermined time later than the timing of said synchronizing signal generated by said calling station, and wherein the compressed voice signal from said called station is expanded in time axis based on said effective synchronizing signal for reproducing an original voice signal.

10. A radio communication method as claimed in claim 9, wherein when said interrupt request signal from said interrupting station is received in the calling station, the compressed voice signal from said called station is expanded in time axis for reproducing the original voice signal, based on the timing of the center of said predetermined time window.