Communication method, transmitting method and apparatus, and receiving method and apparatus
View Patent ↗In a mobile telephone terminal at the transmitting end, voice data to be transmitted are sequentially inputted, and it is determined whether the inputted voice data are silent. The voice data regarded as silent voice are replaced by group numbers, while the voice data indicative of sonant voice as well as the group numbers as replaced are transmitted by wireless. On the other hand, in a mobile telephone terminal at the receiving end, the signals transmitted by wireless are received, and the voice data and group numbers of the received signals are discriminated. The voice data are reproduced as they are, while the group numbers are reproduced as silent, and further processings based on the group numbers are executed. This allows predetermined data to be repetitively transmitted with a high efficiency without degrading communication quality very much. This also facilitates a follow-up participation in a group call.
1. A communication method that gives permission of participation to a receiving apparatus intending to participate in a group by performing follow-up participation in a group call communication being performed among a plurality of numbers belonging to a predetermined group, wherein
at a transmission end, the method comprising:
a step of encoding and framing an inputted voice signal to generate voice frames of voice data;
a step of discriminating which of sonant audio or silent audio the inputted voice signal is when starting a group call and of incorporating a group number needed for the group call communication into a voice frame which is discriminated to be silent audio;
a step of composing at least a predetermined number N of continuous voice frames and a flag of identifying whether all the N continuous voice frames are sonant audio or at least any one of the N continuous voice frames is not sonant audio, to form a transmission frame;
a step of wirelessly transmitting the transmission frame,
at a reception step performing the follow-up participation to a group, the method comprising:
a step of receiving the wirelessly transmitted signal to decode it to a transmission frame;
a step of decoding a voice frame in the decoded transmission frame;
a first judgment step of judging from the flag in the decoded transmission frame whether all the N voice frames are sonant audio or at least any one of the N voice frames is not sonant audio;
a step of outputting voice data in the decoded voice frame if all the N voice frames are judged to be sonant audio in the first judgment step;
a second judgment step of judging whether data in the decoded voice frame is valid or invalid as voice data if at least any one of the N voice frames is judged to be sonant audio in the first judgment step;
a third step of outputting the data in the decoded voice frame as voice data if it is judged to be valid as voice data in the second judgment step and of judging whether the data in the decoded voice frame is valid or invalid as a group number if it is judged to be invalid as voice data in the second judgment step;
a step of performing error handling if it is judged to be invalid as a group number in the third step;
a step of performing a protocol process based on the group number if it is judged to be valid as a group number;
a step of allowing a group call to be received, converting the voice data to a voice signal and canceling a mute to emit sound if the group number is judged to coincide with a group number of a group to which itself belongs, in the protocol process; and
a step of not canceling the mute if the group number is judged not to coincide with a group of a group to which itself belongs, in the protocol process.