Portable radio communication device
A portable radio communication device includes a radio section using a frequency for at least one of signal reception and signal transmission. The frequency used by the radio section is set to a frequency assigned to a memory channel. A mute circuit mutes an audio output circuit when a mute-cancel or monitor switch is not operated, and unmutes the audio output circuit when the switch is operated. A display is controlled to indicate a name assigned to the memory channel when the switch is not operated, and to indicate the frequency assigned to the memory channel when the switch is operated.
1 . A portable radio communication device comprising:
a radio section including a transmitting section and a receiving section, the transmitting section being configured to subject a to-be-transmitted signal to modulation to get a modulation-result signal and transmit the modulation-result signal, the receiving section being configured to receive an incoming signal and subject the received incoming signal to demodulation to get a demodulation-result signal;
a frequency operation section configured to vary at least one of a frequency used by the radio section for signal transmission and a frequency used by the radio section for signal reception when being operated;
a mute section configured to mute the outputting of the demodulation-result signal;
a mute cancel operation section configured to cancel the muting by the mute section when being operated;
a memory configured to store data sets assigned to respective memory channels, wherein each of the data sets includes frequency data representing at least one of a frequency used for signal transmission and a frequency used for signal reception, and letter data representing letters;
a display; and
a display control section configured to access the memory and control the display to indicate letters represented by letter data in a data set assigned to selected one of the memory channels when the mute cancel operation section is not operated to cancel the muting, and configured to access the memory and control the display to indicate at least one of a frequency for signal transmission and a frequency for signal reception which are represented by frequency data in the data set assigned to the selected one of the memory channels when the mute cancel operation section is operated to cancel the muting.
2 . A portable radio communication device as recited in claim 1 , further comprising a general operation section configured to implement various types of setting in the communication device, wherein the mute cancel operation section and the general operation section are designed so that when the mute cancel operation section is operated by user's one hand, the general operation section can be operated by user's other hand without interference with user's one hand.
3 . A portable radio communication device as recited in claim 2 , further comprising a mute control section configured to decide whether a received signal is present or absent, and enable the mute section when it is decided that a received signal is absent.
4 . A portable radio communication device as recited in claim 2 , further comprising a mute control section configured to decide whether a specified signal addressed to the communication device is present in or absent from a received signal, and enable the mute section when it is decided that a specified signal addressed to the communication device is absent from a received signal.
5 . A portable radio communication device as recited in claim 3 , wherein a frequency used by the radio section is varied as the frequency operation section is operated in cases where the display indicates a frequency in response to operation of the mute cancel operation section.
6 . A portable radio communication device as recited in claim 5 , wherein frequency data representing a varied frequency used by the radio section at a moment of the end of operation of the mute cancel operation section is written over the frequency data in the data set assigned to the selected one of the memory channels.
7 . A portable radio communication device as recited in claim 5 , wherein frequency data representing a varied frequency used by the radio section at a moment of the end of operation of the mute cancel operation section is discarded.
8 . A portable radio communication device as recited in claim 5 , wherein the memory channels are separated into a first group and a second group, wherein frequency data representing a varied frequency used by the radio section at a moment of the end of operation of the mute cancel operation section is written over the frequency data in the data set assigned to the selected one of the memory channels in cases where the selected one of the memory channels is in the first group, and wherein frequency data representing a varied frequency used by the radio section at a moment of the end of operation of the mute cancel operation section is discarded in cases where the selected one of the memory channels is in the second group.
9 . A portable radio communication device as recited in claim 5 , further comprising reception frequency changing means configured to exchange a frequency used by the radio section for signal transmission and a frequency used by the radio section for signal reception to monitor the frequency for signal transmission when being operated, wherein the frequency for signal transmission and the frequency for signal reception are alternately indicated each time the reception frequency changing means is operated while the mute cancel operation section remains operated.
10 . A portable radio communication device as recited in claim 9 , wherein a frequency used by the radio section for signal reception is varied as the frequency operation section is operated in cases where the display indicates a frequency for signal reception in response to operation of the mute cancel operation section.
11 . A portable radio communication device as recited in claim 9 , wherein a frequency used by the radio section for signal transmission is varied as the frequency operation section is operated in cases where the display indicates a frequency for signal transmission in response to operation of the mute cancel operation section and operation of the reception frequency changing means.
12 . A portable radio communication device as recited in claim 9 , wherein a frequency used by the radio section for signal transmission and a frequency used by the radio section for signal reception are simultaneously varied and a difference therebetween remains constant as the frequency operation section is operated in cases where the display indicates a frequency in response to operation of the mute cancel operation section.
13 . A portable radio communication device comprising:
a radio section using a frequency for at least one of signal reception and signal transmission;
means for setting the frequency used by the radio section to a frequency assigned to a memory channel;
an audio output circuit;
a switch;
a mute circuit muting the audio output circuit when the switch is not operated, and unmuting the audio output circuit when the switch is operated;
means for indicating to a user a name assigned to the memory channel when the switch is not operated; and
means for indicating to the user the frequency assigned to the memory channel when the switch is operated.
14 . A portable radio communication device as recited in claim 13 , wherein indication of the frequency replaces indication of the name when the switch is operated.
15 . A portable radio communication device as recited in claim 13 , wherein indication of the frequency is added to indication of the name when the switch is operated.