JP2001255386A - Electronic apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electronic apparatus having a clock function and a broadcast receiving function and capable of surely correcting time indication by time information included in the broadcast wave. SOLUTION: An FM multiplex broadcasting is searched and received at least when the reception signal of a radio tuner is not output, time information is taken out of the received FM multiplex broadcasting and the time indication is corrected.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic device, and more particularly, to an electronic device having a clock function and a broadcast receiving function.

[0002]

2. Description of the Related Art In a portable radio having a timekeeping function and an FM multiplex broadcasting function, an apparatus for correcting the time of the timekeeping function by adjusting a display time to time information extracted from the FM multiplex broadcasting has been realized.

On the other hand, automobiles are used under severe temperature environments. For this reason, the frequency of the oscillator fluctuates greatly due to a temperature change. Therefore, the display time of the in-vehicle timepiece is easily deviated. For this reason, it is desired to incorporate a function of correcting the display time by adjusting the display time to the time information extracted from the FM multiplex broadcast.

[0004]

However, an audio system for a vehicle is equipped with not only a radio but also various devices such as a compact disk player, a cassette player, a mini disk player, etc., and a compact disk player, a cassette player, Listening to audio using a mini-disc player has become mainstream. For this reason,
To extract the time information from the FM multiplex broadcast and correct the display time, it is necessary to stop the operation of the compact disc player, cassette player, mini disc player, turn on the radio tuner, and select the FM multiplex broadcast. . As described above, many operations are required to correct the display time by the FM multiplex broadcasting.

[0005] Therefore, even if a display time correction function based on FM multiplex broadcasting is installed in the above-described in-vehicle audio system, it may not be possible to take advantage of the display time correction.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has as its object to provide an electronic device capable of correcting a timekeeping time based on time information included in a broadcast wave and performing accurate timekeeping.

[0007]

SUMMARY OF THE INVENTION The present invention provides a receiving means for receiving a broadcast wave including at least time information among a plurality of broadcast waves, and outputting an acoustic signal corresponding to the received broadcast wave; At least one sound output means for outputting a time, a time measuring means for measuring time, an output selecting means for selectively outputting at least one sound signal among output sound signals of the receiving means or the sound output means, and time information. Time information extracting means to be extracted, at least during a period when the output audio signal of the receiving means is not selected by the output selecting means,
And a time adjusting means for adjusting the time measured by the time measuring means in accordance with the time information extracted by the time information extracting means.

According to the present invention, a broadcast wave including time information among a plurality of broadcast waves is received during a period in which the output sound signal of the receiving means is not selected, and time information is extracted from the received broadcast wave. By correcting the clock time of the clock means,
The time can be corrected to an accurate time without affecting the output sound signal from the output selection means.

Further, according to the present invention, when the output audio signal is switched from the reception means to the audio output means by the output selection means, the reception frequency is stored in the storage means, and then the reception frequency is changed to the broadcast signal containing time information. Change to reception frequency,
When the output sound signal is switched from the sound output means to the reception means by the output selection means, the reception frequency of the reception means is returned to the reception frequency stored in the storage means.

According to the present invention, a CD, a tape cassette,
When switching from another audio device such as an MD to a receiving device such as a radio, a broadcast signal received by the receiving device before using the audio device can be automatically received.

[0011]

FIG. 1 is a block diagram showing an embodiment of the present invention.

The present embodiment shows an example in which the present invention is applied to, for example, a vehicle-mounted audio system.

The audio system 1 of this embodiment comprises a compact disc player 2, a cassette player 3, a radio tuner 4, an amplifier 5, a speaker 6, a display unit 7, and a system control unit 8.

The compact disc player 2, cassette player 3, and radio tuner 4 are connected to an amplifier 5 via an audio signal line 9 and to a system controller 8 via a bus 10. Further, the radio tuner 4 is supplied to the display unit 7 via the FM composite signal line 11.

A compact disc 12 is inserted into the compact disc player 2. The compact disk player 2 reproduces an audio signal from the compact disk 12 and supplies the reproduced audio signal to the amplifier 5 via the audio signal line 9. Reproduction, stop, and jump of the compact disc player 2 are controlled by a control signal supplied from the system control unit 8 via the bus 10.

A tape cassette 13 is inserted into the cassette player 3. The cassette player 3 reproduces an audio signal from the tape cassette 13 and supplies it to the amplifier 5 via the audio signal line 9. Operations such as reproduction, stop, fast forward, and rewind of the cassette player 3 are controlled by a control signal supplied from the system control unit 8 via the bus 10.

The radio tuner 4 is connected to a system control unit 8 via a bus 10, and selectively receives a predetermined channel from an AM / FM broadcast wave in accordance with a control signal supplied from the system control unit 8. The radio tuner 4 receives and demodulates the broadcast wave of the selected channel, and supplies an audio signal to the amplifier 5 via the audio line 9. Also,
When receiving the FM multiplex broadcast, the radio tuner 4 supplies an FM composite signal from the FM multiplex broadcast wave to the display unit 7 via the FM composite signal line 11.

Audio signals are supplied to the amplifier 5 from the CD player 2, the cassette player 3, and the radio tuner 4. The amplifier 5 includes an amplifier circuit and a filter, and drives the speaker 6 according to the audio signal. In addition, amplifier 5
Is connected to the system control unit 8 via a bus 10, controls an amplifier circuit according to control information supplied from the system control unit 8, controls an audio signal level, and is supplied from the system control unit 8. The filter is controlled according to the control information to control the sound quality of the audio signal. The speaker 6 is driven by the amplifier 5 and outputs sound.

The display unit 7 includes a clock generator 14, a counter 15, an FM multiplex decoder 16, a display controller 17, and a display 18.

The clock generator 14 generates a clock. The counter 15 counts the clock from the clock generator 14 and outputs time information. The counter 15 is supplied with time information from the FM multiplex decoder 16. The counter 15 sets the time information from the FM multiplex decoder 16 to a count value.

The FM multiplex decoder 16 receives the FM signal from the radio tuner 4 via the FM composite signal line 11.
A composite signal is provided. FM multiplex decoder 16
Decodes time information and character information from the FM composite signal.

The time information decoded by the FM multiplex decoder 16 is supplied to a counter 15, and the character information is supplied to a display controller 17.

The display controller 17 controls the display 18 according to the time information supplied from the counter 15 and the character information supplied from the FM multiplex decoder 16. Display 18
Comprises a liquid crystal display panel and the like. Display 18
Is controlled by the display control unit 17 to display time information and character information.

In the counter 15, time information supplied from the FM multiplex decoder 16 is replaced with a count value.

The system control section 8 comprises an operation section 19 and an audio control section 20. The operation unit 19 includes a plurality of operation keys. The operation state of the operation key is transmitted to the audio control unit 20.

The audio control section 20 supplies control information to the compact disc player 2, the cassette player 3, the amplifier 5, and the display section 7 via the bus 10 according to the operation state from the operation section 19.

Next, the time adjustment operation by the audio control unit 20 will be described.

FIG. 2 shows a flowchart of the audio control unit according to one embodiment of the present invention.

When the audio control unit 20 detects an audio mode switching operation by the operation unit 19 in step S1, the audio control unit 20
In step S2, it is determined whether the current audio mode is the radio mode.

If the current audio mode is the radio mode in step S2, the mode is switched to the audio mode corresponding to the operation of the operation unit 19 in step S3. Note that the switchable audio mode includes a mode in which all audio is off, that is, a state in which the user turns off the audio system 1. In such a case, a display relating to sound and audio is not output, but the radio tuner 4 can be kept in the operating state. However, even in this case, when the accessory (Acc) switch of the vehicle is off, the radio tuner 4 is also stopped, and the audio control unit 2 is stopped.
The time adjustment operation by 0 is not performed.

After the audio mode is switched in step S3, it is determined in step S4 whether the currently receiving radio channel is FM multiplex broadcasting by the currently receiving radio tuner 4. If it is determined in step S4 that the currently received radio channel is not an FM multiplex broadcast, the reception frequency of the currently received radio channel is stored in step S5.

When the reception frequency of the currently received radio channel is stored in step S5, then in step S6
To control the radio tuner 4 to perform the seek operation of the reception frequency.

Next, the audio control unit 20 determines in step S
At 7, it is determined whether or not the seek operation of step S6 has been stopped. If it is determined in step S7 that the seek operation has stopped, it is determined in step S8 whether or not the radio channel currently selected by the radio tuner 4 is FM multiplex broadcasting.

When it is determined in step S8 that the selected radio channel is not an FM multiplex broadcast,
Returning to step S6, the radio tuner 4 performs the seek operation again.

If it is determined in step S8 that the selected radio channel is an FM multiplex broadcast, the FM multiplex decoder 16 is controlled in step S9 to extract time information from the FM composite signal.
A step S10 decides whether or not the time information has been extracted in the step S9.

If it is determined in step S10 that the time information has been extracted, the extracted time information is written in the counter 15 in step S11. After writing the time information to the counter 15 in step S11, the process returns to step S1. If no time information is extracted in step S9, the process returns to step S1 without rewriting the counter 15.

If it is determined in step S4 that the currently received radio channel is FM audio multiplex broadcasting, the reception frequency of the radio tuner 4 does not need to be changed. Be executed.

If it is determined in step S2 that the current audio mode is not the radio mode, it is determined whether the audio mode determined in response to the operation of the operation unit 19 in step S12 is the radio mode.

If it is determined in step S12 that the mode is the radio mode, it is determined in step S13 whether a reception frequency is stored. That is, by storing the reception frequency when switching from the radio mode to another audio mode last time (see step S5), it is determined whether or not the user has switched to a radio channel different from the radio channel that the user was listening to. Have judged.

If it is determined in step S13 that the reception frequency is stored, the reception frequency of the radio channel is returned to the stored reception frequency in step S14.
After the reception frequency of the radio channel is returned to the original reception frequency in step S14, the audio mode is switched to the radio mode in step S15.

When it is determined in step S13 that the reception frequency is not stored, the reception frequency has not been changed, and the voice mode is switched to the radio mode in step S15. Further, when the audio mode determined according to the operation of the operation unit 19 in step S12 is not the radio mode, the user does not listen to the radio, so the determination is made according to the operation of the operation unit 19 in step S15. Switch to voice mode.

When the sound mode is switched to the determined sound mode in accordance with the operation of the operation unit 19 in step S15, it is determined in step S16 whether or not the radio channel currently being received by the radio tuner 4 is FM multiplex broadcasting. Step S
When it is determined in step 16 that the received radio channel is FM multiplex broadcasting, time information can be extracted, and then the steps after step S9 are executed.

When it is determined in step S16 that the received radio channel is not FM multiplex broadcasting, time information cannot be extracted, and the process returns to step S1 to continue the processing.

If the voice mode switching operation is not performed in step S1, the process for switching is unnecessary, and the process is performed from step S16.

The processing in steps S1 to S16 takes a time sufficiently shorter than one second, for example, a frequency of 64H.
z, that is, with a period of 15.6 ms. On the other hand, the time information is transmitted from the broadcasting station about once every 1 to 5 minutes. The frequency at which time information can be extracted varies depending on the reception state, and cannot be extracted every time a broadcast station transmits. Therefore, in step S10, it is determined whether or not the time information has been extracted in step S9. If the time information has been received, in other words, if the time information has been received in step S10, the counter 1
Update the value of 5.

Next, a process for writing time information to the counter 15 will be described.

FIG. 3 is a diagram for explaining an operation of writing time information to a counter according to one embodiment of the present invention.

The counter 15 counts up the count value every second by a clock supplied from the clock generator 14. For example, as shown in FIG. 3, the count value is “10:09:59” at time t1 and “1” at time t2.
0:10:00 ".

Time t3 when x [sec] has elapsed since time t2
Then, there is an instruction from the audio control unit 20 to rewrite the time information. At this time, if the time information extracted by the FM multiplex decoder 16 is “10:10:00”, the count value of the counter 15 is again changed to “10:10:00”. 10:10:00 ".

The counter 15 has a count value of “10: 1”.
0:00 ", the counting of 1 [sec] is started again. Thereafter, the counter 15
The clock supplied from is counted. In FIG. 3, at time t4 when 1 [sec] has elapsed from time t3, "10: 1"
0:01 ".

As described above, if the user is listening to the FM multiplex broadcast on the radio tuner 4, when the time information is extracted, the time when the count value of the counter 15 is extracted based on the time information supplied from the FM multiplex broadcast. Since the information is corrected, the correct time can always be displayed.

Further, if the user selects a C other than the radio tuner 4
When any of the sound sources of the D player 2 and the cassette player 3 is selected, or when the audio system 1 is turned off, the count value of the counter 15 is extracted from the time information supplied from the FM multiplex broadcast. The corrected time information is displayed, and the correct time can be displayed.

It should be noted that the present invention is not limited to the above-described embodiment, and various modifications and embodiments can be considered without departing from the scope of the claimed invention.

[0054]

As described above, according to the present invention, a broadcast wave including time information among a plurality of broadcast waves is received during a period in which the output audio signal of the receiving means is not selected, and By extracting the time information and correcting the time measured by the time measuring means, there is a feature that the time can be corrected to an accurate time without affecting the sound signal output from the output selecting means.

According to the present invention, a CD, a tape cassette,
When switching from another audio device such as an MD to a receiving device such as a radio, a broadcast signal received by the receiving device before using the audio device can be automatically received.

[Brief description of the drawings]

FIG. 1 is a block diagram of an embodiment of the present invention.

FIG. 2 is a flowchart of an audio control unit according to an embodiment of the present invention.

FIG. 3 is a diagram illustrating a time switching operation according to an embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Audio system 2 Compact disk player 3 Cassette player 4 Radio tuner 5 Amplifier 6 Speaker 7 Display unit 8 System control unit 9 Audio signal line 10 Bus 11 FM composite signal line 12 Compact disk 13 Tape cassette 14 Clock generation unit 15 Counter 16 FM multiplexing Decoder 17 Display control unit 18 Display

Claims (2)

[Claims] 1. A receiving means for receiving at least one broadcast signal including time information among a plurality of broadcast signals, for outputting an audio signal corresponding to the received broadcast signal, and at least one for outputting an audio signal Sound output means; clock means for measuring time; output selection means for selectively outputting at least one of the output sound signals of the reception means or the sound output means; and a time at which the time information is extracted Information extracting means, and a time for correcting the time measured by the time measuring means in accordance with the time information extracted by the time information extracting means at least during a period when the output sound signal of the receiving means is not selected by the output selecting means. An electronic device, comprising: a correction unit. 2. The time correction means includes: storage means for storing a reception frequency of the reception means; and the storage means when the output sound signal is switched from the reception means to the sound output means by the output selection means. After the reception frequency is stored, the reception frequency is changed to the reception frequency of the broadcast signal including the time information, and the output sound signal is switched from the sound output means to the reception means by the output selection means. 2. The electronic apparatus according to claim 1, further comprising a receiving frequency control unit for returning a receiving frequency of said receiving unit to a receiving frequency stored in said storage unit.