JPS6013569B2 - sweep receiver - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a sweep receiver, and in particular has a beat function in which the mirror repeats repeatedly within the same band, and switches to another band when reaching the edge frequency of one band. The present invention relates to a sweep receiver characterized in that it is equipped with a sweep function to start cotton stripping, and that a striping method can be arbitrarily selected by a cutting means.

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of the present invention, in which a local oscillator circuit 1 includes a normal superheterodyne receiving section consisting of a phase-locked loop (PLL) 2, and a programmable frequency divider 3 forming the PLL 2. It is made up of a control section that controls and controls the operation. The sweep control unit includes a minute ratio setting counter that counts the sweep pulses from the rust removing pulse generator 4 whose generation is stopped upon detection of reception and changes the division ratio of the programmable frequency divider 3. 5, a ROM (read only memory) 6 in which the lowest and highest receiving frequencies of each receiving band are set, and the lowest receiving frequency fmin is preset in the division ratio setting counter 5; The value of the frequency division ratio setting counter 5 and the highest receiving frequency f set in the ROM 6
A coincidence detection circuit 7 that detects coincidence of the values of
It is composed of a control means 9 for controlling. and 10'
When the band selection keys 11 and 12 are operated and when the coincidence detection signal S is generated, the division ratio setting counter 5 is read from the ROM 6.
13 is a T flip-flop constituting the control means 9, and the set terminal S
The AM band key 11 is connected to the reset terminal R, the FM band key 12 is connected to the reset terminal R, and the repeat key 14 is connected to the trigger terminal T via an inverter 15 and an AND gate 16. is connected to the coincidence detection signal S. and output terminal Q
, Q are connected to the NM and AF band selection states of the ROM6. Next, the operation of the present invention having such a configuration will be explained. First of all, the example is a domestic band, and the receiving frequency is skin 53.
When the sweep reaches the lowest receiving frequency fmin to the highest receiving frequency fm side x as shown in Fig. 2 at sail & ~ l6 dish, FM76MHZ~90, cape Z, the lowest receiving frequency f again.
The so-called sawtooth wave sweep that starts the sweep from min will be explained.

First, repeat key 14 is operated, AM band key-1
1 is selected, the T flip-flop 13 of the control means 9 is set by operating the AM band key 11, the Q output becomes "H", and the ROM 6 outputs fmjn,
53 OKHz and 161 Hz are output to the fmax output terminal respectively, and they turn on at the same time as the AM band keys 1 and 1 are operated.
By the generation of the preset enable signal S2 from the R gate 10, the division ratio setting counter 5 is preset to the 530K ratio of the lowest AM reception frequency. After the initial state setting is completed, the frequency division ratio setting counter 5 counts up from 53 KHz by the sweep pulse from the sweep pulse generator 4, changes the frequency division ratio of the programmable divider 3, and sets the As shown in Figure 2, the highest receiving frequency fma
Perform cotton pulling in the direction of x.

If received during the sweep, the generation of pulses by the sweep pulse generator 4 is stopped by the generation of the reception detection signal S3, so the division ratio setting counter 5 continues to receive that station without changing its value. . When the sweep further progresses and reaches the highest reception frequency, the coincidence detection circuit 7 detects a coincidence with the highest reception frequency #max output from the ROM 6.
, occurs, but since the repeat key 14 is being operated at this time, the AND gate 16 is not opened by the output of the inverter 15, so the T flip-flop 13 is not inverted and band switching is not performed, and the OR gate is opened. 10
With the generation of the preset enable signal S2 from
The lowest AM reception frequency of 53 Hz is preset in the division ratio setting counter 5 from the OM6.

Then, the sweep is repeated as shown in FIG. This is FM
The same applies to band reception. Next, considering the case where the AM band key 11 is selected and the repeat key 14 is not operated, the coincidence detection signal S. When is generated, the AND gate 16 is opened, the T flip-flop 13 is triggered, and Q is inverted to "H".

Therefore, ROM6 is switched to FM, and the fmin output terminal has 76 levels, and the fmax output terminal has 90. With the generation of the reset enable signal S2 that is generated at the same time, the division ratio setting counter 5 is set to 76.0, which is the lowest FM reception frequency. Sengawa z is preset. Thereafter, the sweep progresses in the same manner as described above, and when the highest FM reception frequency of 90.0 MHz is reached, the T flip-flop 13 is inverted again and the ROM 6 becomes the AM function, and as a result, as shown in FIG. Stripes alternately. If another band selection operation is performed during the sweep of one band, the T flip-flop 13 is immediately inverted and the selected band can be switched.

Furthermore, although the above description has been made regarding automatic sweeping, it is of course applicable to manual sweeping as well. In this way, the sweep receiver of the present invention has the ability to repeatedly stripe or beat sweep within the same band, and switch to another band when the end frequency of one band is reached, by simply operating the repeat key. The automatic striping sweep function can be selected at will, which improves functionality and operability and greatly contributes to increasing the added value of products.

[Brief explanation of drawings]

Figure 1 shows the configuration of the present invention, Figures 2, 3, and 4.
The figure is a diagram showing the sweep operation of FIG. 1. 1...Local oscillation circuit, 2...PLL,
4...Full pulse generator, 5...Counter for setting division ratio, 6...ROM, 7...Coincidence detection circuit, 8... Input means, 9...
control means. Fin 1 illustration, 2 illustrations, 3 illustrations, 4 illustrations

Claims (1)

[Claims] 1. In a sweep receiver in which the local oscillator circuit is configured with a phase-locked loop (PLL), a frequency division ratio changing means for changing the frequency division ratio of a programmable frequency divider constituting the phase-locked loop, and a band edge frequency an input means consisting of a band selection key and a repeat key, and when the band selection key of the input means is operated, a band edge frequency corresponding to the operated band is read from the storage means, and the frequency dividing ratio is read from the storage means; setting it in the changing means, and when the end frequency of the other band is reached, the end frequency of another band is read from the storage means and set in the dividing ratio changing means, and when the repeat key of the input means is operated. , control means for reading the end frequency of the same band from the storage means and setting it in the frequency division ratio changing means when the end frequency of the band selected by the band selection key is reached. .