JPH0314842Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a synthesizer receiver suitable for being mounted on a vehicle.

Background Art and Problems When a synthesizer receiver is mounted on a vehicle, it is usually mounted on a dart board that can be easily operated from the driver's seat. However, if the distance between the antenna attached to the car body and the synthesizer receiver is large, it is necessary to lengthen the feeder connected between them. When used in applications, the loss of the received high-frequency signal becomes large. Therefore, it is desirable to install the synthesizer receiver as close to the antenna as possible. Therefore, the synthesizer receiver was separated into a synthesizer receiving section and a remote control section, and the remote control section was attached to the dart board to make it easier to operate, and the synthesizer receiving section was installed close to the antenna to solve the above problems. It is requested that the issue be resolved.

Purpose of the Invention In view of these points, the present invention attempts to propose a synthesizer receiver that has a simple configuration and can be separated into a synthesizer receiver section and a remote control section.

Summary of the invention The synthesizer receiver according to the invention is a shift
a synthesizer receiving section having a store register;
It has a microprocessor and a remote control unit that includes an operation unit and a reception status display unit connected to the microprocessor, and by operating the operation unit, the microprocessor can perform frequency division corresponding to the selected frequency. A remote control signal consisting of a series of data signals including the ratio data signal and the reception mode switching data signal and a latch pulse corresponding to the end of the series of data signals is generated and supplied to the shift/store register, and the reception mode switching data signal is set as the latch pulse. By latching at the same time, the tuning frequency and reception mode of the synthesizer reception section are controlled.

According to the present invention, it is possible to obtain a synthesizer receiver that can be separated into a synthesizer receiving section and a remote control section with a simple configuration.

Embodiment An embodiment of the synthesizer receiver according to the present invention (in the case of a vehicle-mounted receiver) will be described in detail below with reference to FIG. In FIG. 1, 1 is a synthesizer receiving section, and 2 is a remote control section. First, the synthesizer receiving section 1 will be explained. 3 is
This is the FM receiving section. 4 is an AM receiving section which can receive broadcast waves in the MW band and LW band.

First, the FM receiving section 3 will be explained. The received signal from the FM antenna 5 is supplied to a high frequency amplifier 6 and amplified, and the amplified high frequency signal is supplied to a mixer 8 forming a frequency converter 7. 9
is a voltage-controlled variable oscillator as a local oscillator constituting this frequency converter 7. The intermediate frequency signal obtained from the frequency converter 7 is amplified by an intermediate frequency amplifier 10 and then supplied to an FM demodulator 11 for FM demodulation. This FM demodulator 11
The output of
Left and right audio signals are obtained from terminal 13R, and when receiving monaural broadcasting, the monaural audio signal is output from terminal 13.
Commonly obtained for L and 13R.

Next, the AM receiving section 4 will be explained. The high frequency signal from the AM receiving antenna 14 is supplied to a high frequency amplifier 15 and amplified, and then supplied to a mixer 17 that constitutes a frequency converter 16 . Reference numeral 18 denotes a voltage-controlled variable oscillator as a local oscillator constituting the frequency converter 16. Frequency converter 16
The intermediate frequency signals are supplied to the intermediate frequency amplifier 19 and amplified, then supplied to the AM detector 20 for AM detection, and the output thereof is supplied to the multiplexer 12 described above and output terminals 13L and 13R.
Commonly output from .

21 is a PLL for channel selection, which will be explained below. 22 is a reference oscillator made of a crystal oscillator or the like, and the oscillation signal from this is supplied to a prescaler 23 and divided into 1/M, and then sent to a phase comparator 24.
supplied to On the other hand, the local oscillation signals from the local oscillators 9 and 18 of the FM receiver 3 and the AM receiver 4 are passed through a prescaler 25 with a frequency division ratio of 1/K to a programmable frequency divider 26 with a frequency division ratio of 1/N. The output from the prescaler 23 is supplied to the phase comparator 24, where the phase is compared with the output from the prescaler 23. The phase comparison output from the phase comparator 24 is sent to the FM receiver 3 and AM through low-pass filters 27 and 28.
The voltage is supplied to the local oscillators 9, 18 and high frequency amplifiers 6, 15 of the receiving section 4 as a tuning voltage.

29 indicates a shift/store register, which will be explained below. Reference numeral 30 denotes a shift register consisting of, for example, four stages of flip-flop circuits _F1 to _F4 . _L1 ~ _L4 are flip-flop circuits _F1 ~
This is a latch circuit that latches the output of _F4 . From each latch circuit _L1 to _L4 , FM/AM switching control signal, MW/LW switching control signal, local/
A DX control signal and a stereo/monaural switching control signal (“1” and “0”, respectively) are output. Further, the output of the flip-flop circuit _F4 at the final stage of the shift register 30 is connected to the programmable frequency divider 26.
supplied to

Next, the remote control section 2 will be explained. 31 is a microprocessor, which includes an operation section 32.
and a reception status display section 33 are connected. Further, this remote control section 2 is integrally provided with a cassette tape deck 34 (a playback machine, which can also be a digital audio disk deck), which is also controlled by the microprocessor 31. Therefore, the operating section 32 is provided with an operating knob for controlling the tuning frequency and reception mode of the synthesizer receiving section 1 and an operating knob for controlling the operating mode of the cassette tape deck 34. The display section 33 also includes a display section for the selected frequency of the synthesizer receiving section 1, a display section for FM/AM, and a display section for MW/AM.
LW display section, local/DX display section, stereo/monaural display section, power supply display section, synthesizer receiving section 1 and cassette tape deck 34
It is equipped with an operating status display section, etc.

Next, the operation of the synthesizer receiver shown in FIG. 1 will be explained with reference to the waveform diagram shown in FIG. 2. When the operation knob for controlling the tuning frequency or reception mode for the synthesizer receiving section 1 is operated on the operation section 32 of the remote control section 2, the tuning frequency as shown in FIG. 2A is output from the output terminal 31A of the microprocessor 31. Frequency division ratio data signal D ₁ and reception mode switching data signal D ₂ with an appropriate number of bits corresponding to
A serial data signal, a clock signal as shown in FIG. 2B from the output terminal 31B, and a latch pulse as shown in FIG. 2C from the output terminal 31C are output. The serial data signal of FIG. 2A is synchronized with the clock signal shown in FIG. 2B. Then, when the sending of the division ratio data signal _D1 of the predetermined number of bits of the serial data signal and the reception mode switching data signal of 4 bits is completed, the signal shown in FIG.
A latch pulse as shown in the figure is obtained.

The serial data signal obtained from the output terminal 31A of the microprocessor 31 is sent to the input terminal 35 through the connection line A to the flip-flop circuit F1 at the first stage of the shift register 30 of the shift/store register 29 of the synthesizer receiver ₁ .
Supplied via A. Further, the clock signal from the output terminal 35B of the microprocessor 31 is supplied via the connection line B to each of the flip-flop circuits _F1 to _F4 of the shift register 30 and the programmable frequency divider 26 via the input terminal 35B. Further, the latch pulse from the output terminal 35C of the microprocessor 31 is supplied via the connection line C to each of the latch circuits _L1 to _L4 of the shift/store register 29 and the programmable frequency divider 26 via the input terminal 35C. .

For example, if the serial data signal is composed of an n-bit frequency division ratio data signal _D1 and a 4-bit reception mode switching data signal _D2 , this serial data signal is supplied to the shift register 30 of the shift/store register 29. , the latch pulse is supplied to the latch circuits _L1 to _L4 and the programmable frequency divider 26, so that the n+4 bit frequency division ratio is The data signal is given to the programmable frequency divider 26 as a frequency division ratio, and "1" or "0" according to the reception mode switching data from each flip-flop circuit _F1 to _F4 of the shift register 30 is applied to the latch circuit _L1. ~Latched to L ₄ .

Note that when any of the operation knobs for controlling the frequency division ratio data signal or the reception mode switching data signal is operated in the remote control unit 2, the data for the remaining operation knobs are previously operated and transferred to the microprocessor. The data stored in the memory of 31 is transmitted. Then, the reception mode switching control of the synthesizer receiving section 1 is performed in accordance with the reception mode switching data of the latch circuits _L1 to _L4 . That is,
Depending on which of the FM/AM modes is selected, power is supplied to either the FM receiver 3 or the AM receiver 4, and the frequency division ratios of the prescalers 23 and 25 are switched. By switching MW and LW, the frequency division ratios of prescalers 23 and 25 are switched. By switching between local and DX, the gains of the high frequency amplifiers 6 and 15 of the FM receiving section 3 or AM receiving section 4 are controlled. The stereo multiplexer 12 is controlled by switching between stereo and monaural.

According to the present invention described above, it is possible to obtain a synthesizer receiver that can be separated into a synthesizer receiving section and a remote control section with a simple configuration. That is, although the remote control section 2 is provided with a microprocessor 31, the synthesizer receiving section 1 is provided with a receiving circuit 3,
In addition to 4, there is a shift/store register 2 that is easy to configure.
9, the configuration of the synthesizer receiving section 1 becomes extremely simple. Furthermore, when connecting the remote control section 2 and the synthesizer receiving section 1 using connection lines, only three connection lines are required. Even if the number of types of reception mode switching data signals increases, there is no need to increase the number of connection lines by simply increasing the number of shift/store registers 29 or using one with a large number of stages. Connect the remote control unit 2 to other electronic devices,
For example, by integrating with the cassette tape deck 34, in the case of a synthesizer receiver mounted on a vehicle, the cassette tape deck 34 and the remote control section 2 of the synthesizer receiver can be integrated and housed in the dashboard. Since the synthesizer receiver can be separated into a remote control section and a synthesizer receiving section, by installing the synthesizer receiving section 1 near the antenna, losses caused by the feeder can be reduced, especially when receiving broadcast waves in the MW band. be able to. Furthermore, even though a frequency division ratio data signal corresponding to the selected channel frequency and a plurality of reception mode switching data signals are transmitted, only one latch pulse is required for the serial data signal, so there is no risk of malfunction.

Effects of the Invention According to the present invention described above, it is possible to obtain a synthesizer receiver that can be separated into a synthesizer receiving section and a remote control section with a simple configuration.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of a synthesizer receiver according to the present invention, and FIG. 2 is a waveform diagram for explaining the same. 1 is a synthesizer receiving section, 2 is a remote control section, 3
is an FM receiving section, 4 is an AM receiving section, 29 is a shift store register, 31 is a microprocessor, 32
Reference numeral 33 indicates an operation section, and 33 indicates a reception status display section.

Claims (1)

[Scope of utility model registration request] It has a synthesizer reception section having a shift/store register, a remote control section comprising a microprocessor, an operation section connected to the microprocessor, and a reception status display section, and by operating the operation section, The microprocessor generates a remote control signal consisting of a series of data signals including a division ratio data signal and a reception mode switching data signal corresponding to the selected channel frequency, and a latch pulse corresponding to the end of the series of data signals. A synthesizer receiver characterized in that the tuning frequency and reception mode of the synthesizer reception section are controlled by supplying the reception mode switching data signal to a shift/store register and simultaneously latching the reception mode switching data signal with the latch pulse.