Mobile communication terminal device

A mobile communication terminal device comprising:

• an A/D converter for converting a transmitting analog signal into a transmitting digital signal;
• a digital filter, to one input of which an output of the A/D converter is supplied and to the other input of which a receiving digital signal is supplied, for applying a decimation process to the output of the A/D converter to send out to an outside, and applying an interpolation process to the receiving digital signal, whereby the output of the A/D converter and the receiving digital signal can be processed on time-division basis;
• a selector for selecting one of the receiving digital signal, which is subjected to the interpolation process by the digital filter, and one channel of broadcasted audio digital signals;
• a first D/A converter for converting one of the receiving digital signal, which is subjected to the interpolation process by the digital filter, and one channel of the audio digital signals into an analog signal in synchronism with a selecting operation of the selector;
• and
• a second D/A converter for converting the other channel of the audio digital signals into the analog signal.

A mobile communication terminal device comprising:

• an A/D converter for converting a transmitting analog signal into a transmitting digital signal;
• a first digital filter, to one input of which an output of the A/D converter is supplied and to the other input of which a receiving digital signal is supplied, for applying a decimation process to the output of the A/D converter to send out to an outside and applying an interpolation process to the receiving digital signal, whereby the output of the A/D converter and the receiving digital signal can be processed on time-division basis;
• a second digital filter to which both channels of broadcasted audio digital signals are supplied, for applying the interpolation process to both channels of the audio digital signals on time-division basis;
• a selector for selecting any one of the receiving digital signal, which is subjected to the interpolation process by the first digital filter, and one channel of the audio digital signals, which is subjected to the interpolation process by the second digital filter;
• a first D/A converter for converting any one of the receiving digital signal, which is subjected to the interpolation process by the first digital filter, and one channel of the audio digital signals, which is subjected to the interpolation process by the second digital filter, into an analog signal in synchronism with a selecting operation of the selector;
• and
• a second D/A converter for converting the other channel of the audio digital signals, which is subjected to the interpolation process by the second digital filter, into the analog signal.

A mobile communication terminal device comprising:

• an A/D converter for converting a transmitting analog signal into a transmitting digital signal;
• a selector for selecting any one of an output of the A/D converter and a receiving digital signal;
• a first digital filter to which an output of the selector is supplied, for applying a decimation process to the output of the A/D converter to send out to an outside if the output of the selector is an output of the A/D converter, and for applying an interpolation process to the receiving digital signal if the output of the selector is the receiving digital signal;
• a second digital filter to which both channels of audio digital signals are supplied, for applying the interpolation process to both channels of the audio digital signals on time-division basis;
• a first D/A converter for converting the receiving digital signal, which is subjected to the interpolation process by the first digital filter, into an analog signal;
• a second D/A converter for converting one channel of the audio digital signals, which is subjected to the interpolation process by the second digital filter, into the analog signal;
• and
• a third D/A converter for converting the other channel of the audio digital signals, which is subjected to the interpolation process by the second digital filter, into the analog signal.

A mobile communication terminal device comprising:

• an A/D converter for converting a transmitting analog signal into a transmitting digital signal;
• a selector for selecting any one of an output of the A/D converter and a receiving digital signal;
• a first digital filter, to one input of which an output of the selector is supplied and to the other input of which one channel of broadcasted audio digital signals is supplied, for applying a decimation process to the output of the A/D converter to send out to an outside if the output of the selector is the output of the A/D converter, and for applying an interpolation process to the receiving digital signal and applying the interpolation process to one channel of the audio digital signals if the output of the selector is the receiving digital signal, whereby the output of the selector and one channel of the audio digital signals can be processed on time-division basis;
• a second digital filter for applying the interpolation process to the other channel of the audio digital signals;
• a first D/A converter for converting the receiving digital signal, which is subjected to the interpolation process by the first digital filter, into an analog signal;
• a second D/A converter for converting one channel of the audio digital signals, which is subjected to the interpolation process by the first digital filter, into the analog signal;
• and
• a third D/A converter for converting the other channel of the audio digital signals, which is subjected to the interpolation process by the second digital filter, into the analog signal.