JPS6134773Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is based on a preset receiver (e.g.
AM, FM receiver) as well as various functions (e.g., tape playback function, record playback function, etc.), and these functions can be selectively selected. Regarding improvements.

Figure 1 shows an example of a conventional multi-functional device, in which 1 is an FM tuner that can digitally set the frequency like a synthesizer tuner, 2 is an AM tuner of a similar type, and 3 is a tuning control circuit. It has a built-in RAM that stores 5 frequency data each for AM and FM. Reference numeral 4 denotes a frequency display consisting of a 5-digit, 7-segment display, which is statically driven by the received frequency data outputted from the tuning control circuit 3 at that time.

PS ₁ to _{PS 5} are preset switches, which in this example are momentary type switches, whose outputs (+B) are supplied to address input terminals AD1 to AD5 of the tuning control circuit 3.
MS is a memory switch and its output (+B)
is supplied to the memory input terminal M of the tuning control circuit 3. “AM/FM” is a band switching input terminal (enable terminal).

“PHONO” is a player input terminal for connecting the output of a record player, “TAPE” is a tape input terminal for connecting the output of a tape deck, “AUX” is for connecting other audio signal sources (microphones, etc.) This is the auxiliary input terminal.

Each of FSI to FSV is a function switch, and is mechanically interlocked so as to be capable of selectively operating.

5 is an audio amplifier, which outputs FM and AM tuners or outputs "PHONO", "TAPE",
Selectively amplify the input signal supplied to “AUX”.

In the above configuration, the function switch
If FS or FS is selectively turned on and then one of the preset switches PS ₁ to PS ₅ is selectively turned on, this device will switch to preset type AM or
It functions as an FM receiver, and by selectively turning on the function switches FS to FS, the device functions as a record playback amplifier, tape playback amplifier, microphone amplifier, etc.

By the way, the tuning control circuit 3 is usually an IC.
As mentioned above, the address input terminal AD
1 to AD5 and a band switching terminal "AM/FM". Then, during the preset tuning operation, a predetermined signal is supplied to each of the above input terminals.
Conventionally, this type of IC has address input terminals AD1 to AD.
5 and the signal supplied to the band switching input terminal "AM/FM" cannot be processed simultaneously. In other words, it is designed so that no address input is taken in during the transition period of the band switching operation.

Therefore, assuming that the switch buttons are arranged on the front panel as shown in Figure 2, for example, in order to switch from functioning as a tape playback amplifier to functioning as an FM receiver, first press the It is necessary to press the FM switch button 6, and after a predetermined period of time (for example, 1 second), press the switch button 7 for the desired channel (for example, in the case of the first channel). cannot switch functions. When the switch buttons 6 and 7 are pressed in this normal order, the band switching input terminal "AM/
FM" is supplied with +B, and after a predetermined period of time, a predetermined switching operation is completed in the tuning control circuit 3. Next, when the switch button 7 is pressed, the address input terminal AD1 of the tuning control circuit 3 is
is supplied with +B, and its rising edge is taken in as an address signal.

In this way, in conventional multi-function devices of this type, it is possible to function as a receiver (for example, an FM receiver) from some state (for example, a state in which it is functioning as an AM receiver, record playback device, player playback device, etc.). At least two button operations were required in order to switch to the state where the

The purpose of this invention is to switch from a state in which it is operating with a function other than the receiver to a state in which it operates with a function of the receiver, as described above, and to set the receiving frequency to a desired preset frequency.
The object is to enable two operations to be performed by operating a single button.

In order to achieve the above purpose, this invention generates two signals, a function switching signal and a receiving channel setting signal, in response to the operation of the preset channel selection operation section (switch button, etc.), and also The switching signal is immediately supplied to the drive terminal (for example, band switching input terminal) of the tuning control circuit, while the reception channel setting signal is delayed for a certain period of time and then supplied to the address input terminal of the tuning control circuit. It is characterized by a wild animal.

A preferred embodiment of this invention will be described below in detail with reference to the accompanying drawings.

FIG. 3 is an electric circuit diagram showing an example of a multifunctional device according to the invention, and FIG. 4 is a diagram showing an arrangement of switch buttons provided on the front panel of the device.

In FIG. 3, the same reference numerals are given to the same components as in the prior art, and the explanation thereof will be omitted.

In Fig. 3, FS1 to FS8 are function switches that are mechanically interlocked so that they can perform self-holding operations alternatively, and each switch has two circuits of single-pole, double-throw slide contacts. Minutes are provided. Function switch FS1
~FS5 is for specifying the 1st to 5th memory channels of FM or AM, and FS6 to FS8
are used to switch the input source to "PHONO", "TAPE" or "AUX", respectively.

BS ₁ to _{BS 5} are band changeover switches, each of which is configured to perform a mechanical self-holding operation, and each switch is provided with one circuit of single-pole double-throw slide contacts.

Band switching switches BS ₁ to BS ₅ are each function switch FS1 for the 1st to 5th channels.
-Used to switch FS5 for either AM or FM band memory.

The MTS is a muting switch that is mechanically interlocked and turned on for a short period of time only when one of the function switches FS1 to FS5 is switched.

And each function switch FS1~FS
8 switch buttons FB ₁ to FB ₈ and each band selection switch BS ₁ to BS ₅ switch buttons BB ₁ to _{BB 5}
are arranged on the front panel as shown in FIG.

+ _B1 is the first power supply, and this power supply + _B1 is connected to each band changeover switch _BS1 via the normally open contact of the first circuit of each function switch FS1 to FS5.
~ BS ₅ common terminal, and further selectively supplied to FM tuner 1 or AM tuner 2 depending on the switching status of switches BS ₁ to _{BS 5} , and also supplied to AM tuner 2. At the same time, it is supplied to the band switching input terminal "AM/FM" (enable terminal) of the tuning control circuit 3. Also, +B ₁ is the enable terminal “AM/FM”
When this is applied to the enable terminal “AM/FM”, the state of the enable terminal “AM/FM” changes from “0” to “1”, and the tuning control circuit 3 switches to the AM side. A selection of functions is made. On the other hand, enable signal +
When the supply to the enable terminal "AM/FM" of _B1 is stopped, the state of the enable terminal "AM/FM" changes from "1" to "0", and the function of the tuning control circuit 3 is selected to the FM side. Ru. moreover,
+ _B2 is a second power supply, and this power supply + _B2 is connected to each address input terminal AD1 to AD5 of the tuning control circuit 3 via a resistor _R1 and a normally open contact of the second circuit of the function switches FS1 to FS5. supplied to. In addition, each function switch FS1
A transistor TR is inserted between the common terminal of ~FS5 and the ground, and a second power supply +B is supplied to the base of the transistor TR via a muting switch MTS and an RC integrating circuit 8.

LED ₁ to _{LED 2} are light emitting diodes for displaying the memory channel designated at that time.

In the above configuration, as shown in FIG. 3, assume that the band switching switches BS ₁ to BS 2 and BS ₄ for the first, _second and fourth channels are FM, and the band switching switches BS for the third and fifth channels are FM. ₃ and BS ₅
It is assumed that each channel is set to AM, that desired frequency data is stored in each channel in each band memory in the tuning control circuit 3, and that only the function switch FS7 is in an on state.

In this state, the audio signal supplied to the input terminal "TAPE" is amplified by the audio amplifier 5 and then output to the output terminal OUT.

Next, when the function changeover button switch FB ₃ shown in FIG. 4 is pressed, the function switch FS3 is turned on and the function switch FS7 is turned off as shown in FIG. The switch MTS turns on only for a short period of time and turns off after switching completely. In other words, to explain this operation in detail, first, when switch button FB ₃ begins to be pressed, the muting switch MTS turns on after a small time delay, and as the button continues to be pressed further, the normally open contact of function switch FS 3 changes from OFF to ON. After that, the mutating switch MTS is turned off after a short delay.

Therefore, the base potential of the transistor TR rises to + _B2 with a slight time delay after the switch button FB ₃ begins to be pressed, drawing a time constant curve as shown in FIG. While drawing a curve, it drops to almost ground potential. Then, after the normally open contact of the function switch FS3 switches from OFF to ON, the muting switch MTS turns OFF after a minute delay, and the base potential of the transistor TR rapidly drops to the ground potential, while the collector potential Suddenly +
Stand up to B ₂ .

As a result, the band switching input terminal "AM/FM" of the tuning control circuit 3 has a switch button.
After starting to press FB ₃ , the power is turned on after a minute delay.
B ₁ is supplied, and when the switch button FB ₃ is further pressed, the potential of the address input terminal AD 3 of the control circuit 3 rises rapidly, and this rise causes channel designation and automatically
Preset tuning is performed based on the frequency data stored in the third AM channel.

Also, while the third channel is specified,
Since this power supply + _B2 is also supplied to the light emitting diode LED3, the currently designated channel can be confirmed based on this lighting state.

As described above, in this embodiment, each switch has two circuits of contacts and is mechanically interlocked with each other so that it operates as a self-holding single-point selection type switch. , a mutating switch that is turned on only during the switching of each switch is used, and the band switching input terminal of the tuning control circuit is energized through the contact point of the first circuit of each of the switches. The structure is configured so that each address input terminal of the tuning control circuit is energized through the contacts of two circuits, and the output of the mutating switch is further configured to delay the rise of energization to each address input terminal. By simply pressing one function button while performing any function operation, you can switch it to function as a receiver and simultaneously select the preset channel of your choice. .

In this embodiment, a muting switch is used as a means for delaying the signals to each address input terminal AD1 to AD5 of the tuning control circuit 3 relative to the signal to the band switching input terminal "AM/FM".
The MTS off point is each function switch FS
Although the delay from the on-point of FS1 to FS5 has been utilized, it is of course possible to use a pure electronic circuit instead of such a mechanical delay mechanism.

As is clear from the above explanation, the switching circuit according to the present invention is configured so that the function as a receiver is automatically selected in response to the operation of each switch button for specifying a channel. Since the channel designation signal is supplied to the address input terminal of the tuning control circuit after a time delay, simply by operating the channel designation switch, you can switch from the operating state of any function to the state of functioning as a receiver, and at the same time It is possible to select a preset desired channel.

[Brief explanation of the drawing]

Figure 1 is the circuit diagram of the conventional device, Figure 2 is the layout of the switch buttons on the front panel, Figure 3 is the circuit diagram of the device of the present invention, and Figure 4 is the layout of the switch buttons on the front panel. 5 are waveform diagrams for explaining the operation of the transistor TR. 1, 2...Tuner, 3...Tuning control circuit, FS1 to FS5...Channel switch, FS
6 to FS8...Switches for other functions, FB ₃ to _{FB 7} ...
...Channel switch, FB ₁ , FB ₂ , FB ₈ ...
Switch buttons for other functions, BS ₁ to BS ₅ ... Band selection switch, MTS... Muting switch, AM/FM... Enable terminal.

Claims (1)

[Claims for Utility Model Registration] (1) In addition to a receiver, the receiver has at least one other function, and the receiver has a tuner for digitally setting the reception frequency and a tuner for digitally setting the reception frequency, and a tuner for transmitting digital data to be provided to the tuner. a tuner control circuit having a built-in memory of a plurality of channels stored therein; and the tuner control circuit has an enable terminal for activating the circuit, and a predetermined period of time after an enable signal is supplied to the enable terminal. In a multi-function device having a channel designation signal input terminal that enters a state in which a channel designation signal is taken in with a delay, a switch button is provided, one switch button corresponding to each channel of a memory and a function other than the receiver;
Switches are provided corresponding to each of these switch buttons and interlocked with each other so that they operate selectively, and a channel designation signal is generated after a certain time delay from the time when the switch for each channel is operated. and a delay means for supplying the switch output of each channel to the enable terminal, and supplying the output of the delay means to each channel designation input terminal. switching circuit. (2) A utility model registration request characterized in that the delay means is a switch that is mechanically linked to the operation of the switch button of each channel and operates a certain period of time later than the switching timing of each channel switch. A switching circuit for a device with a built-in receiver according to item 1. (3) The receiver is equipped with two tuners, AM and FM, and the tuner control circuit is equipped with a band switching input terminal, and between each channel switch and the band switching input terminal, and between each channel switch and each tuner. A switching circuit for a device with a built-in receiver according to claim 1, wherein a band switching switch is inserted between the switching circuit and the switching circuit.