JPS5999812A - Preset device of synthesizer receiver - Google Patents

Abstract

PURPOSE:To attain very easily the adjustment by storing a data from which a check frequency is outputted independently of a part of preset or a preset memory and outputting the check frequency when no backup battery exists. CONSTITUTION:A discriminating circuit 21 detects a voltage of a backup battery E and when it is discriminated that the preset memory 10 is not backed up by the battery E, a signal is applied to a control circuit 7. When a preset button of a keyboard 8 is depressed, the data stored in a fixed memory 20 is read out and received at a check frequency in response to this data. When the memory 10 is backed up by the battery E, the data of a receiving frequency stored in the memory 10 is read out.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a synthesizer receiver in which eight reception frequencies can be selected by control of a microcomputer having a memory function, and in particular, This relates to a preset device.

[Background technology and its problems]

P L that uses a crystal oscillator as a reference signal in the receiver's tuning circuit
L (Phase-Locks+d Loop)
Synthesizer receivers use a circuit to set the frequency output from this PLL circuit as a local oscillation frequency and control various tuning circuits with control voltages corresponding to this frequency.Since the PLL circuit can be controlled by digital signals, the reception Channel selection, presetting, etc. can be easily performed using button switches, making it extremely easy to operate.

Figure 1 is a schematic block diagram of a synthesizer receiver, in which 1 is a front end that selects the receiving frequency;
2 is an intermediate frequency amplification section, and 3 is a demodulation section.

4 indicates a low frequency amplification section. Note that 5 indicates a part of another front end that receives, for example, AM broadcast waves.

Reference numeral 6 denotes a PLL circuit constituting a frequency synthesizer, which is composed of a reference signal source, a comparison circuit, a programmable divider, etc. as is well known, and is connected to the front end 1.
The local oscillator 1b injected into the frequency converter 1a and the tuning frequency voice 9 of the high frequency amplifier 1C are controlled by a control meter.
J+ru.

? f1 my-1 etc.゛τ・configuration t1 before 1i P L
The control circuit that controls the L circuit 6 is shown in Fig. 1-5.
This control circuit T1τ is the human-powered port 1-4':FM
/'AM selection switch - Scan, /Nice frequency -L knob, or D'/'S selection switch, Receive - fN' set in memory.
10, write the reception channel number 10 frequency, and read it out (the preset switch etc. is provided).

In addition, the mIj direction 1 circuit T is provided with a preset memory 10 that stores preset functions. Vessel 9
<, it is possible to drive 4-75.

By operating the various operation switches 2' on the keyboard 8, you can manually select the desired number/
Able to select 1 and 2. In addition, in order to perform auto-tuning, the peak output of the demodulator 3 is inputted through the 0777 circuit 11, and at that point, the reception state is changed to -f, and the control signal at that time is written into the preset memory 10. The synthesizer/receiver with the more detailed configuration described above has a preset button with 1 and 1.
It is possible to extract the data in the memory 10 from the memory 10 and put it in the trap receiving state, but at this time, the data written in the memory 101 of the memory 7 and the receiver's power is turned off in the evening. When it's off, I'm backing up Kaiike EC.

However, at the manufacturing stage in factories etc.
d[]Hack: Since the gamma battery F is not normally equipped, you can use the preset button to immediately set the IA to the reception state of the desired frequency. is a normal receiver with a dial, and while looking at the display g, check the frequency pressure of the measuring device. I adjusted the voltage, the tuning circuit of the receiver, the footing, the severance, etc.

However, since such adjustment work is repeatedly performed for each receiving band, each time the receiving frequency must be adjusted to the check frequency of the measuring instrument, and the time required for the adjustment process is also long. There was a drawback.

[Purpose of the invention]

The invention of ,', takes advantage of the characteristics of the C/Size receiver, and makes it possible to easily perform the adjustment work at the manufacturing stage and the adjustment work at the time of maintenance by pressing a preset button.5. It is something.

[Summary of the invention]

In order to achieve the dual purpose, the present invention provides a control circuit for a PLL circuit with a determination circuit (1') for detecting the presence or absence of a battery that uses the Bricella 1 memory as a base. If the backup battery is not used to reset the battery, the 1M disconnection (-2) will be written to the previous dC precent memory.
The configuration is such that the 1"C check frequency is read out using a preset button, making it easier to adjust the synthesizer receiver and also detecting the consumption of the backup amplifier battery. It has been made possible.

〔Example〕

FIG. 2 shows an embodiment of the present invention (synthesizer → J-Izer receiver). The same functions as those in FIG. 1 are indicated by the same symbols. .

From this point on, (IJ's synthesizer machine is equipped with a read-only fixed memory 20 consisting of the above-mentioned serial memory IOIC MASK ROM, etc.).
A row 5 determination circuit 21 is provided to detect the presence or absence of the I, .

The determination circuit 21 detects the voltage of the bank-up battery E.
(- or physically detects the presence of 2 ticks/tube batteries E, and the preset memory 10 stores the bank-up battery E.
When it is determined that the bank is not banked up by ti, the control circuit 7 supplies τiJ.

When the preset button 1-'8 is pressed as shown in FIG. 3, the data stored in the fixed memory 20 is read out. 11. When the memory 10 is backed up by the backup battery E, if the memory 10 is backed up by the backup battery E, the receiver stored in the preset memory 10 is Data of 14 frequencies is read out.

The data stored in the fixed memory 20jC corresponds to the check frequencies necessary for adjusting the receiver. For example, Table 1 shows an example of the check frequencies when there are six reception bands.

As explained in Table 1 onwards, this Genmei synthesizer receiver operates like a normal synthesizer receiver when the backup battery E is attached, suppressing the preset button (switch) on the keyboard. (When it is -, the data of the reception channel stored in the preset memory is read out, and the reception state is set on that reception channel. However, when there is no backup battery E, as mentioned above, When you press the Brisera l button, the check frequency shown in Table 1 above (this check frequency is a normal broadcast signal, and a frequency with no waves is selected) will enter the receiving state.

Therefore, when the backup battery E is not installed at the factory manufacturing stage, the (-nick frequency in Table 1 is j(
If equipped with a primary output measurement device, a receiver equipped with the device of the present invention can be dragged very easily.
Adjustments such as 4-even are possible.

In addition, even outside the manufacturing stage, for example, when re-adjusting after repairs, removing the backup battery E will return to the receiving state at the check frequency, which has the advantage of making readjustment easier. can also be used.

The fixed memory 20 is a conventional preset memory (RAM).
) may be constructed by performing MASKf, and the determination circuit 21 may also be formed integrally within the same IC circuit.

〔Effect of the invention〕

As described above, the synthesizer receiver of the present invention has the effect that the check frequency can be outputted as a part of the preset memory or independently of the preset memory, and the check frequency can be outputted very easily. This has the advantage that readjustment becomes easy.

[Brief Description of the Drawings] Fig. 1 is a block diagram showing an overview of a synthesizer receiver, Fig. 2 is a block diagram of a synthesizer receiver of the present invention, and Fig. 3 is a flowchart of a control circuit. , 1 is the front end, 6 is the PLL circuit, 1 is the control circuit, 8 is the keyboard, 1o is Briceratome Senri, 20
21 indicates a fixed memory, and 1° indicates a judgment circuit.

Claims (1)

[Claims] A synthesizer receiver having a preset memory function is provided with a determination circuit that detects the presence or absence of a backup battery connected to the preset memory, and when the determination circuit determines that bank amplification by batteries is not performed, the preset memory is 1. A preset device for a synthesizer receiver, characterized in that a check frequency stored in the receiver is controlled to be read out by operating a preset button.