Digital radio communication system with efficient audio and non-audio data transmission
First Claim
1. A radio communication system for transmitting audio data and non-audio data between a transmitter personal station and a receiver personal station, the audio data and the non-audio data being transmitted on time slots which have been time-division multiplexed, each of the transmitter personal station and the receiver personal station comprising:
- a transmission/reception means for transmitting and receiving the time slots to and from other personal station, each of the time slots including a data field in which one of the audio data and the non-audio data are written, a control field in which control information is written, and an identifier field in which one of a first identifier for the audio data and a second identifier for the non-audio data is written;
an audio data conversion means provided with a microphone for receiving speech through the microphone and converting the speech into audio data;
a non-audio data holding means provided with an input terminal connected with an output terminal of a data processor, said non-audio data holding means receiving non-audio data from the data processor, and holding the non-audio data received;
an audio data amount detection means for detecting whether an amount of audio data to be produced per unit time by said audio data conversion means is lower or higher than a predetermined threshold;
a write means for, when the amount of the audio data has been detected to be lower than the threshold, fetching a predetermined amount of non-audio data from said non-audio data holding means, writing the non-audio data fetched to the data field of a first time slot, further writing the second identifier to the identifier field of the first time slot, and making said transmission/reception means transmit the first time slot to the other personal station, and when the amount of the audio data has been determined to be higher than the threshold, writing the audio data produced in said audio data conversion means to the data field of a second time slot, further writing the first identifier to the identifier field of the second time slot, and making said transmission/reception means transmit the second time slot to the other personal station;
a speech restoration means provided with a speaker for restoring speech from audio data;
an identifier detection means for detecting whether the identifier field of a third time slot that said transmission/reception means has received from the other personal station has the first identifier or the second identifier; and
a distribution means provided with an output terminal connected with an input terminal of the data processor for, when said identifier detection means has detected that the identifier field of the third time slot has the first identifier, fetching audio data from the data field of the third time slot, and outputting the audio data fetched to said speech restoration means, and when said identifier detection means has detected that the identifier field of the third time slot has the second identifier, fetching non-audio data from the data field of the third time slot, and outputting the non-audio data fetched to the data processor.
1 Assignment
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Accused Products
Abstract
In a radio communication system for performing digital radio communications by using time-division multiplexed time slots, a first personal station receives its user'"'"'s speech through the microphone, converts it into audio data, and transmits them on time slots to a second personal station. On the other hand, the first personal station receives non-audio data from the data processor connected with the second personal station and stores. When the audio data amount inputted to the first personal station in a unit time period is lower than a threshold and the communications between the first personal station and the second personal station are put in a silence condition, the first personal station transmits non-audio data on times slots to the second personal station. When the communications return to a sound condition, audio data transmission is restored. Whether each time slot carries audio data or non-audio data is designated by an identifier which is written in a predetermined field of each time slot.
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Citations
23 Claims
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1. A radio communication system for transmitting audio data and non-audio data between a transmitter personal station and a receiver personal station, the audio data and the non-audio data being transmitted on time slots which have been time-division multiplexed, each of the transmitter personal station and the receiver personal station comprising:
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a transmission/reception means for transmitting and receiving the time slots to and from other personal station, each of the time slots including a data field in which one of the audio data and the non-audio data are written, a control field in which control information is written, and an identifier field in which one of a first identifier for the audio data and a second identifier for the non-audio data is written; an audio data conversion means provided with a microphone for receiving speech through the microphone and converting the speech into audio data; a non-audio data holding means provided with an input terminal connected with an output terminal of a data processor, said non-audio data holding means receiving non-audio data from the data processor, and holding the non-audio data received; an audio data amount detection means for detecting whether an amount of audio data to be produced per unit time by said audio data conversion means is lower or higher than a predetermined threshold; a write means for, when the amount of the audio data has been detected to be lower than the threshold, fetching a predetermined amount of non-audio data from said non-audio data holding means, writing the non-audio data fetched to the data field of a first time slot, further writing the second identifier to the identifier field of the first time slot, and making said transmission/reception means transmit the first time slot to the other personal station, and when the amount of the audio data has been determined to be higher than the threshold, writing the audio data produced in said audio data conversion means to the data field of a second time slot, further writing the first identifier to the identifier field of the second time slot, and making said transmission/reception means transmit the second time slot to the other personal station; a speech restoration means provided with a speaker for restoring speech from audio data; an identifier detection means for detecting whether the identifier field of a third time slot that said transmission/reception means has received from the other personal station has the first identifier or the second identifier; and a distribution means provided with an output terminal connected with an input terminal of the data processor for, when said identifier detection means has detected that the identifier field of the third time slot has the first identifier, fetching audio data from the data field of the third time slot, and outputting the audio data fetched to said speech restoration means, and when said identifier detection means has detected that the identifier field of the third time slot has the second identifier, fetching non-audio data from the data field of the third time slot, and outputting the non-audio data fetched to the data processor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A radio communication system for transmitting audio data and non-audio data between a transmitter personal station and a receiver personal station, the time slots being divided into a first group and a second group which follows the first group, the first group being assigned to the audio data and the second group being assigned to the non-audio data, a ratio of a number of time slots in the first group to a number of time slots in the second group being changed depending on an amount of the audio data to be transmitted, the audio data and the non-audio data being transmitted on time slots which have been time-division multiplexed, each of the transmitter personal station and the receiver personal station comprising:
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a transmission/reception means for transmitting and receiving time slots in a unit time to and from other personal station, each of the time slots including a data field in which audio data and non-audio data are written, and a control field in which control information is written; an audio data conversion means provided with a microphone for receiving speech through the microphone and converting the speech into audio data; a non-audio data holding means provided with an input terminal connected with an output terminal of a data processor, said non-audio data holding means receiving non-audio data from the data processor, and holding the non-audio data received; a free time slot counting means for monitoring time slots to be transmitted by said transmission/reception means in the unit time, and counting as free time slots a number of time slots whose data fields include data of less than a predetermined amount of threshold; an assignment information determination means for determining an assignment information which indicates a number of a final time slot in the first group, based on the number of time slots counted in said free time slot counting means; an assignment information report means for writing the assignment information to the control field of a first time slot and making said transmission/reception means transmit the first time slot to the other personal station; an assigning means for assigning the time slots in the first group to the audio data and the time slots in the second group to the non-audio data; an assignment information acquisition means for acquiring the assignment information from the control field of a time slot received by said transmission/reception means; a speech restoration means provided with a speaker for restoring speech from audio data; a distribution means provided with an output terminal connected with an input terminal of a data processor for fetching audio data from the data fields of the time slots in the first group, fetching non-audio data from the data fields of the time slots in the second group, and outputting the audio data fetched to said speech restoration means and the non-audio data fetched to the data processor. - View Dependent Claims (21, 22)
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23. A radio communication system for transmitting audio data and non-audio data between a transmitter personal station and a receiver personal station, the transmitter personal station informing the receiver personal station of an occurrence of a silence condition in communications before transmitting non-audio data to the receiver personal station, or informing the receiver personal station of an occurrence of a sound condition in communications before transmitting audio data to the receiver personal station, the audio data and the non-audio data being transmitted on time slots which have been time-division multiplexed, each of the transmitter personal station and the receiver personal station comprising:
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a transmission/reception means for transmitting and receiving time slots in a unit time to and from other personal station, each of the time slots including a data field in which audio data and non-audio data are written, and a control field in which control information is written; an audio data conversion means provided with a microphone for receiving speech through the microphone and converting the speech into audio data; a non-audio data holding means provided with an input terminal connected with an output terminal of a data processor, said non-audio data holding means receiving non-audio data from the data processor, and holding the non-audio data received; an audio data amount detection means for detecting whether an amount of audio data to be produced per unit time by said audio data conversion means is lower or higher than a predetermined threshold; a switch command write means for, when the amount of audio data to be produced by said audio data conversion means has been detected to be lower than a predetermined threshold, fetching a predetermined amount of non-audio data from said non-audio data holding means, writing the non-audio data fetched to the data field of a first time slot, further writing a non-audio data transmission switch command which indicates that audio data transmission has been switched to non-audio data transmission to the control field of the first time slot, and making said transmission/reception means transmit the first time slot, and when the amount of audio data to be produced by said audio data conversion means has been detected to be higher than a predetermined threshold, writing the audio data obtained from said audio data conversion means to the data field of a second time slot, further writing an audio data transmission command which indicates that non-audio data transmission is switched to audio data transmission to the control field of the second time slot, and making said transmission/reception means transmit the second time slot; a transmission/reception control means for making said switch command write means write one of audio data and non-audio data, when a time slot whose data field includes an acknowledgement command which indicates that a reception of non-audio data has been acknowledged has been received from the other personal station; a speech restoration means provided with a speaker for restoring speech from audio data; the flag being on when the communications are in the silence condition and being off when the communications are in the sound condition; and a flag storage means for storing a flag, which indicates a non-audio data reception mode for receiving non-audio data when it is on, and indicates an audio data reception mode for receiving audio data when it is off; a flag setting means for detecting whether the control field of a third time slot received from the other personal station includes a non-audio data transmission switch command or an audio data transmission switch command, and setting the flag at on when the control field of the third time slot includes the non-audio data transmission switch command and setting the flag at off when the control field of the third time slot includes the audio data transmission switch command; a confirmation command application means for writing a non-audio data reception acknowledgement command which indicates that a reception of non-audio data has been acknowledged to the control field of a fourth time slot, and making said transmission/reception means transmit the fourth time slot in response to the non-audio data reception mode, and for writing an audio data reception acknowledgement command which indicates that a reception of audio data has been acknowledged to the control field of a fifth time slot, and making said transmission/reception means transmit the fifth time slot in response to the audio data reception mode; and a distribution means provided with an output terminal connected with an input terminal of the data processor for, in the audio data reception mode, fetching audio data from the data field of a time slot received by said transmission/reception means and outputting the audio data fetched to said speech restoration means, and in the non-audio data reception mode, fetching non-audio data from the data field of a time slot received from the other personal station and outputting the non-audio data fetched to the data processor.
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Specification