Abstract: A plurality of items and a cursor capable of clearly pointing out an item selected from these items are displayed on a display screen. These plural items are employed so as to select a function and to input a character. On a telephone directory registering screen used to enter a character, when a user depresses a determination switch under such a condition that a cursor 25 is located at a position of a direction indication 26 indicative of a switching position of a cursor mode, the cursor mode is switched. Thus, in response to an operation input of a cursor switch, such a condition that the cursor can be moved along the right/left direction is changed into another condition that the display item can be scrolled along the upper/lower direction. At this time, the direction indication 26 is switched in correspondence with the change in the cursor modes.

Abstract: A selective caller receiver which can facilitate easy setting of a test mode without using an exclusive jig and also easy management and adjustment of a receiving unit. In the selective caller receiver, a memory for storing therein test mode setting data is provided and turning ON of a control switch causes the data to be read out from the memory. When a test mode is judged to be present on the basis of the read-out data, a battery saving operation is released and the receiving unit is continuously operated to set the receiving unit in the test mode. When a test mode is judged not to be present, the receiving unit is operated in its battery saving mode.

Abstract: A selective call receiver which can facilitate easy setting of a test mode without using an exclusive jig and also easy management and adjustment of a receiving unit. In the selective call receiver, a memory for storing therein test mode setting data is provided and turning ON of a control switch causes the data to be read out from the memory. When a test mode is judged to be present on the basis of the read-out data, a battery saving operation is released and receiving unit is continuously operated to set the receiving unit in the test mode. When a test mode is judged not to be present, the receiving unit is operated in its battery saving mode.

Abstract: An FSK signal receiver includes an amplifier which amplifies a first FSK signal at an adjustable gain. A frequency converter converts an output signal from the amplifier into a second FSK signal having a frequency lower than a frequency of the first FSK signal. A demodulator demodulates the second FSK signal into a baseband signal. A bit-state detector detects a bit state from the baseband signal in response to a threshold. A calculator calculates a number of times of occurrence of a fact that the baseband signal moves across the threshold during a given time. The gain of the amplifier is adjusted in response to the number of times which is calculated by the calculator.

Abstract: A bit synchronization circuit receives polarity-judged output signal and a level-judged output signal that are produced through demodulation of a 2-value FSK or 4-value FSK transmission signal. Flip-flop circuits and an exclusive-OR circuit generate a second sampling output by sampling and delaying the polarity-judged output signal. Flip-flop circuits and an exclusive-NOR circuit generate a third sampling signal having a given temporal relationship with the second sampling output by sampling and delaying the level-judged output signal. AND circuits supply a correction signal to a counter circuit when levels of the second and third sampling outputs and a phase signal indicating a correction period of the counter circuit satisfy a given relationship. In response to the correction signal, the counter circuit corrects its count so as to produce a clock signal having a rate that is equal to a transmission rate of the transmission signal.

Abstract: An FSK signal receiver includes an amplifier which amplifies a first FSK signal at an adjustable gain. A frequency converter converts an output signal from the amplifier into a second FSK signal having a frequency lower than a frequency of the first FSK signal. A demodulator demodulates the second FSK signal into a baseband signal. A bit-state detector detects a bit state from the baseband signal in response to a threshold. A calculator calculates a number of times of occurrence of a fact that the baseband signal moves across the threshold during a given time. The gain of the amplifier is adjusted in response to the number of times which is calculated by the calculator.