JPH0344346U - - Google Patents

Description

[Brief Description of the Drawings] Fig. 1 is a block diagram of the overall configuration according to an embodiment of the device of the present invention, Fig. 2 is a block diagram showing a specific configuration for band identification display, and Fig. 3 is a block diagram of each part of the device shown in Fig. 2. Signal waveform diagram, Figure 4 is a block diagram showing the specific configuration for band identification notification, Figure 5 is a signal waveform diagram of each part in Figure 4, Figures 6 and 7 are as shown in Figures 2 and 4. FIG. 3 is a diagram showing a specific circuit of a corresponding portion. 11...First heterodyne detection section, 12...Antenna (waveguide section), 13...First local oscillator, 1
5...First intermediate frequency amplifier, 16...Second heterodyne detection section, 17...Second local oscillator, 19...
...Second intermediate frequency amplifier, 20...Logic section, 2
1...PLL synchronous detection unit, 22...Amplifier (circuit), 23...Sweep oscillator, 25...Display means, 26...Switching circuit, 27...Buzzer (
notification means), 28... oscillation circuit, 38, 39...
D flip-flop, 40, 41...LED, 5
1...OP amplifier, 52...Tone selection switch,
53...OP amplifier.

Claims (1)

[Claims for Utility Model Registration] (1) A first device that obtains a first intermediate frequency from a received wave of a waveguide and an oscillated wave of a first local oscillator forming a PLL circuit.
a second heterodyne detection section that obtains a second intermediate frequency from the first intermediate frequency and an oscillation wave of a second local oscillator that sweeps the oscillation frequency; In a frequency band identification display device in a superheterodyne receiver equipped with a PLL synchronous detection section for performing identification, a second intermediate frequency signal is provided between the second heterodyne detection section and the PLL synchronous detection section for band identification. a D flip-flop which is provided with a processing logic section and receives a band switching pulse for outputting a detection signal every other cycle of the sweep obtained by the logic section and a PLL lock output from a PLL synchronous detection section; A frequency band identification display device for a superheterodyne receiver, comprising a frequency band identification display means for each band driven by the output of the D flip-flop. (2) A first circuit that obtains a first intermediate frequency from the received wave of the waveguide and the oscillation wave of the first local oscillator forming the PLL circuit.
a second heterodyne detection section that obtains a second intermediate frequency from the first intermediate frequency and an oscillation wave of a second local oscillator that sweeps the oscillation frequency; In a frequency band identification notification device in a superheterodyne receiver equipped with a PLL synchronous detection section for performing identification, a second intermediate frequency signal is transmitted between the second heterodyne detection section and the PLL synchronous detection section for band identification. A logic section for processing is provided, and when synchronous detection is performed by the PLL synchronous detection section, a notification means for notifying it with sound and a plurality of oscillators for driving this notification means are connected to the front via a switch means.・Equipped with an oscillation circuit connected to the latter stage, and the above P
Based on the synchronous detection signal from the LL synchronous detection section and the band switching pulse obtained from the logic section,
Frequency band identification in a superheterodyne receiver, characterized in that when detecting one of the two types of bands, the switching means is turned on to give the output of the oscillator in the previous stage to the oscillator in the latter stage. Notification device.