JPH0526836Y2 - - Google Patents

Description

[Detailed explanation of the idea] (b) Industrial application fields The present invention relates to a receiver with a clock.

(b) Prior Art Conventionally, a receiver with a clock uses a signal output from a clock section to close the power supply path of the receiver when a preset time arrives, thereby activating the receiver. is publicly known.

However, in this type of receiver with a clock, it is necessary to set the receiver to a tuned state before setting the timer operation time.

This is because the timer operates, so even if the power supply path to the receiver is closed, if the receiver is in tune, only noise will be heard, and for example, the output signal of the receiver may be used as an alarm signal. In this case, it is insufficient.

(c) Problems to be solved by the invention As mentioned above, in the conventional technology, it was necessary to set the receiver to a tuned state before setting the timer operation time, which caused problems in operability.

(d) Means for Solving the Problems In view of the above problems, the present invention includes a clock section, a receiving section having an automatic channel selection function, and a key input section including at least a key for setting the timer operation time. A receiver with a clock, which supplies power to the receiving section to perform a timer operation when time information set at a key input section and current time information from the clock section match. The present invention is characterized in that a control section is provided which detects the tuned state of the receiving section when the timer operates, and sets the receiving section to an automatic tuning state when it is detected that the receiving section is out of tune.

(E) Effect According to the present invention, when the time information set by the key input section and the current time information from the clock section match, first the tuning state of the receiving section is detected.

At this time, if it is tuned to the desired broadcast wave, the broadcast wave is continuously received, whereas if it is not tuned, a control signal is supplied to the receiving section to put it in an automatic tuning state.

(F) Embodiment FIG. 1 is a diagram showing an embodiment of the present invention. In FIG. 1, 1 is an antenna, 2 is a front end that converts the high frequency signal from the antenna 1 into an intermediate frequency signal and outputs it, which is a well-known high frequency amplifier circuit,
It includes a local oscillation circuit consisting of PLL and a mixing circuit. 3 is an intermediate frequency amplification circuit, 4 is a detection circuit,
5 is a low frequency amplifier circuit, 6 is a speaker, and 7 is the above-mentioned
A controller consisting of a microcomputer that controls the frequency division ratio N of the programmable frequency divider constituting the PLL and also has a built-in clock section; 8 is a key input section connected to the controller 7; Contains the key. A level detection section 9 detects whether the level of the intermediate frequency signal exceeds a predetermined level, and outputs a sweep stop signal _S1 to the controller 7 when a signal exceeding the predetermined level is detected. Reference numeral 10 denotes a switch disposed in a power supply path 11 to each circuit of the receiving section, and is controlled to be turned on or off by a control signal _S1 from the controller 7. FIG. 2 is a functional block diagram of the present invention. In FIG. 2, 12 is a control section consisting of a microcomputer, 13 is a ROM storing a program executed by the control section 12, 14 is a preset memory in which preset channel selection data is stored,
15 is a data memory for storing timer operation time information and a flag "1" indicating that the information is set; 16 is a selector for controlling the frequency division ratio of the PLL based on the control signal _S3 from the control unit 12; local circuit section,
17 is a band edge detection section that detects whether the tuned frequency has reached the upper limit or lower limit frequency of the band based on the frequency division ratio of the PLL, and 18 is a clock section. It is assumed that all of the above-mentioned parts are built into the controller 7 shown in FIG.

Next, the operation will be explained with reference to FIG.

After setting the timer operation time by operating the keys on the key input section 8, when the timer key is operated, the time and flag "1" are stored in the data memory 15, and the control section 12 is set to the timer operation mode. Ru.

The control unit 12 accesses a predetermined address of the data memory 15, for example address A, and determines whether the flag is "1" or "0" to determine whether the timer operation start time is set. (step).

If the flag is "1", then data memory 1
It is determined whether or not the time information stored in the clock section 5 matches the time supplied from the clock section 18 (step 2). If they do not match, the above-mentioned procedure is repeated, and if they match, switch 10 is turned on to supply power to the receiver (step 3).

Next, it is determined whether the receiving section is in a tuned state based on the output signal from the level detecting section 9 (step 4), and if it is in a tuned state, reception is continued.

On the other hand, if it is not in the tuned state, a control signal _S3 is output to the tuning circuit section 16 to set it to the automatic tuning state (step 5). In such an automatic channel selection state,
In addition to scan and seek that continuously variable control the frequency division ratio of the PLL, a so-called preset scan that sequentially reads station data stored in the preset memory 14 may be used.

As a result of such channel selection, if a signal of a predetermined level or higher is received, a control signal _S4 is output to the channel selection circuit section 16 to stop the automatic channel selection operation and continue to receive the broadcast.

Note that if a signal of a predetermined level or higher is not received until the band edge is reached, the sweep direction is reversed and the sweep is performed again. In this case, the control signal _S4 is supplied to the channel selection circuit section 16 to stop the sweep and turn off the switch 10, thereby forcibly ending the timer operation mode.

After the continuous reception state is set in Step 4 and Step 6, whether or not the timer operation end time has been set is determined by accessing a predetermined address in the data memory 15, for example, address B, in the same manner as described above, and setting the flag. Determination is made based on whether it is "1" or "0" (step 7).

If the flag is "0", the power is continuously supplied thereafter to set the normal operation mode, and if the flag is "1", the operation end time stored in the data memory 15 and the clock section 18 supply the power. It is determined whether the times match (step 8).

As a result of this determination, if the two times match, the switch 10 is turned off and the timer operation ends.

By the way, in the above embodiment, after it is determined in step 9 that the band edge has been reached,
Although the case where the sweep direction is reversed has been described, a sawtooth wave sweep may be used as the sweep method, and after a band edge is detected, the sweep may be started from the other band edge.

FIG. 4 is a functional block diagram of another embodiment of the present invention, in which a predetermined number of detection signals (for example, two
A counter 19 is provided for counting the number of times, and the control section 12 is configured to supply a band switching signal _S5 to the channel selection circuit 16 in response to the carry or borrow output of the counter 19.

Next, the operation will be explained with reference to Fig. 5, but since the basic operation is the same as Fig. 3,
Description of the same parts as in FIG. 3 will be omitted.

In FIG. 5, when it is detected in step 9 that the band edge has been reached, the control section 12 supplies a control signal S6 to the tuning circuit 16 to reverse the sweep direction and set the value of the counter 19 to "1". (steps 10 and 11).

If it is detected in step 12 that no signal higher than the predetermined level is received during this reverse sweep and that the band edge on the opposite side has been reached, the control section 12 supplies a band switching signal _S5 to the channel selection circuit 16. (step 13), and shifts to sweep operation in other bands. Then, the same operation as described above can be repeated in the band concerned.

In addition, in response to the band switching signal, a flag "1" is set in the C address of the data memory 15 or in the flag register (not shown) to indicate that the sweep of one band has been completed, and the second sweep is performed. The above flag is determined according to the output of the counter 19, and if the flag is "1", the channel selection operation is stopped and the switch 10 is turned off.

It is also assumed that the counter 19 is reset in response to the band switching signal _S5 from the control section 12. When ratio tuning is detected, the receiving section is set to an automatic tuning state, so that the received signal can be reliably reproduced when the timer is activated, which is particularly suitable when the received audio is used as an alarm sound. It is.

Furthermore, if the automatic tuning operation of the receiving section by the control section is performed using a single receiving band and stopped when the edge frequency of the receiving band is detected a predetermined number of times,
It is possible to prevent unnecessary sweeping from continuing when there is no broadcast wave.

Furthermore, if the automatic tuning operation of the receiving section by the control section is performed over multiple bands, and if the edge frequency in one receiving band is detected a predetermined number of times, the shift is made to the other receiving band, the received signal can be reliably tuned. can be played.

[Brief explanation of drawings]

Fig. 1 is a diagram showing an embodiment of the present invention, Fig. 2 is a functional block diagram, Fig. 3 is a flowchart, and Fig. 4 is a diagram showing an embodiment of the present invention.
The figure shows another example of functional blocks, and FIG. 5 is a flowchart thereof. 8...Key input section, 9...Level detection section, 10
. . . switch, 12 . . . control section, 16 . . . channel selection circuit section, 17 . . . band edge detection section, 18 . . . clock section.

Claims (1)

[Scope of claim for utility model registration] (1) A clock section, a receiving section having an automatic channel selection function,
and a key input section including at least a key for setting a timer operating time, and when the time information set by the key input section and the current time information from the clock section match, power is supplied to the receiving section. , a receiver with a clock that performs a timer operation, which detects the synchronized state of the receiving section when the timer is operating, and automatically controls the receiving section when it is detected that the receiving section is out of synchronization. A receiver with a clock, characterized in that it is provided with a control section that sets the channel to a tuned state. (2) The clock according to claim 1, wherein the automatic tuning operation of the receiving section by the control section is performed in a single receiving band, and is stopped when an edge frequency of the receiving band is detected a predetermined number of times. Receiving machine. (3) The automatic tuning operation of the receiving section by the control section is performed over multiple bands, and upon detection of an edge frequency in one receiving band a predetermined number of times, the channel is shifted to the other receiving band. A receiver with a clock according to claim 1.