JPS61343U - car radio - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Brief explanation of the drawing]

Fig. 1 is a block diagram of the present invention, Fig. 2 is a block diagram of an embodiment of the invention, Fig. 3 is a diagram showing the tuning characteristics of the tuning circuit, and Fig. 4 is an explanatory diagram of the operation of Fig. 2. , Fig. 5 is a flowchart showing an example of the processing contents of the microprocessor, Fig. 6 is a diagram showing the tuning characteristics of the tuning circuit used when roadside communication is performed at two frequencies, and Fig. 7 is a flowchart showing an example of the processing contents of the microprocessor. A flowchart showing an example of the processing contents of the processor, FIG. 8 is a block diagram of another embodiment of the present invention, FIG. 9 is a flowchart showing the processing contents of the microphone d processor, and FIG. 10 is a block diagram of the conventional example. It is a diagram. 1 is a reception antenna, 2 is a branching filter, 3 is a reception section, 4 is a roadside communication reception section, 5 is an RF amplifier, 6 is a frequency converter,
7 is a positive amplifier, 8 is a demodulator, 9 is a power amplifier, 10 is a crystal oscillator, 11 is a phase comparator, 12 is a low-pass filter, 13 is a voltage controlled oscillator, 14 is a frequency divider, 15 is a detector, 16 is A microprocessor, 17 is a memory, 18 is an output section, 19 is an input section, 20 is an RF amplifier, 21 is a frequency converter, 22 is an IF amplifier, 23 is a demodulator, 24 is a power amplifier, 25 is a comparator, 26 is a Base oscillator, 27 is a switching circuit, 28 is a speaker, 30, 40.41 is a tuning circuit, 31, 42, 43- is an amplifier, 32, 44.45 is a detection circuit, 33, 34. 46 to 49 are differentiating circuits , 50.
51 is an OR gate, 100 is a receiving means, 101 is an antenna, 102 is a speaker, 103 is a switching means, 10-4 is a detection means, 105 is a control means, and 106 is a storage means.

Claims (1)

[Scope of utility model registration request] A receiving means that amplifies and demodulates a signal received through an antenna and applies the signal to a speaker, a switching means that switches a receiving frequency of the receiving means, a detecting means that detects the presence or absence of radio waves for roadside communication, and the detecting means If the presence of the radio waves for roadside communication is detected, the switching means is controlled to change the receiving frequency of the receiving means to the frequency of the radio waves for roadside communication, and the storage means stores frequency information regarding the frequency of the broadcast that was being received. and when the detection sento stage detects the absence of the roadside communication radio waves, the switching means is controlled based on the frequency information stored in the storage means to change the receiving frequency of the receiving means to the above. An in-vehicle radio characterized by comprising: control means for setting a frequency corresponding to frequency information.