Voice communication apparatus using a voice operated transmitter

A voice communication system using a voice communication apparatus for transmitting a voice signal over a radio link, comprising:

• a transmitting buffer for temporarily storing in a time series manner voice signal data obtained by encoding a digital voice signal converted from an input voice signal;
• detecting means for detecting voice and voiceless parts in said input voice signal on the basis of the digital voice signal converted from the input voice signal;
• and
• transmission control means, in response to detection of a voice part by said detecting means, for controlling said transmitting buffer to output said voice signal data in a time series manner sequentially from a voice-start-point of the voice part preceding a detected point of the voice part,
• wherein said transmitting means is rendered inoperative after said detecting means detects a voiceless part and, in response to the detection of the voice part by said detecting means, said transmitting means is rendered operative.

A radio telephone apparatus used in a radio communication system for transmitting a voice signal to a base station over a radio link, comprising:

• analog-to-digital (A-D) converting means for converting an input voice signal to a digital signal;
• encoding means for encoding the digital signal output from said A-D converting means;
• a transmitting buffer for temporarily storing voice signal data encoded by said encoding means in a time series manner;
• signal processing means for converting output data of said transmitting buffer with respect to its transmission rate to generate a burst signal;
• transmitting means for transmitting an output signal of said signal processing means over the radio link;
• detecting means for detecting voice and voiceless parts in said input voice signal on the basis of the output data of said A-D converting means;
• and
• transmission control means for stopping output of the voice signal data from said transmitting buffer in response to detection of the voiceless part by said detecting means and, in response to detection of the voice part by said detecting means, for starting output of the voice signal data from said transmitting buffer in a time series manner sequentially from a voice-start-point of the voice part preceding a detected point of the voice part.

A radio telephone apparatus used in a radio communication system for transmitting a voice signal to a base station over a radio link, comprising:

• analog-to-digital (A-D) converting means for converting an input voice signal to a digital signal;
• encoding means for encoding the digital signal output from said A-D converting means;
• a transmitting buffer for temporarily storing voice signal data encoded by said encoding means in a time series manner;
• signal processing means for converting output data of said transmitting buffer with respect to its transmission rate to generate a burst signal;
• transmitting means for transmitting an output signal of said signal processing means over the radio link;
• detecting means for detecting voice and voiceless parts in said input voice signal on the basis of the output data of said A-D converting means;
• and
• transmission control means for stopping the data output of the voice signal data from said transmitting buffer in response to detection of the voiceless part by said detecting means and, in response to detection of the voice part by said detecting means, for starting output of the voice signal data from said transmitting buffer in a time series manner sequentially from a voice-start-point of the voice part preceding a detected point of the voice part;
• receiving means for receiving a signal transmitted over the radio link;
• decoding means for decoding a voice part included in the signal received by said receiving means into voice data signal on the basis of control data included in the signal received by said receiving means;
• digital-to-analog (D-A) converting means for converting output data of said decoding means into an analog signal;
• and
• reproducing means for reproducing a reception voice from an output signal of said D-A converting means.

A voice communication apparatus in a radio communication system for transmitting a voice signal to a base station over a radio link, comprising:

• storing means for temporarily storing voice signal data corresponding to an input voice signal;
• transmitting means for transmitting the voice signal data stored in the storing means over the radio link;
• detecting means for detecting a point of a voice part of the voice signal data;
• and
• transmission control means for controlling the transmitting means to transmit the voice signal data including a voice-start-point of the voice part preceding the point detected by the detecting means in response to that the detecting means detects the point of the voice part of the voice signal data after a certain period when the detecting means has not detected any points of the voice part of the voice signal data.