JPH07307678A - Traffic information reception equipment - Google Patents

Abstract

PURPOSE:To receive traffic information in the middle of reproducing of a CD or a tape by setting an FM reception circuit to the operating state to select the output of the FM reception circuit at the time or operating a traffic information key during mode selection of an acoustic reproducing device. CONSTITUTION:When a traffic information key 13 which instructs the reception start of an SDK signal is depressed, a band changeover switch 21c is made to switch to the FM side if a mode changeover switch 23 is set to the CD side. At this time, this switching is stored in a RAM 18. When an FM broadcast signal higher than prescribed is detected, it is checked whether an SK signal (the signal indicating the station broadcasting traffic information) is included or not by an SDK detection circuit 11; and if the SK signal is included, it is checked whether a DK signal (the signal discriminating a message) is included or not. If the DK signal is included, it is judged that traffic information can be received, and the mode changeover switch 23 is switched to the radio side so that traffic information can be listen to. At this time, this switching is stored in the RAM 18 and is displayed on a display device 19.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a traffic information receiving device having a multi-band radio and a sound reproducing device such as a CD and a tape.

[0002]

[Prior Art] In countries of West Germany and Australia,
ARI using the FM band (AUTOFAHRER RUNDFUNK IN
FORMATION) has been broadcast traffic information. This traffic information is not broadcast by all broadcasting stations, so in order to identify whether or not it is the station broadcasting the traffic information, the station broadcasting this traffic information is called SK signal. The 57kHz subcarrier is constantly transmitted. Therefore, the receiver is configured to easily select the traffic information execution station by detecting the SK signal. In addition, since the traffic information is broadcast irregularly in the middle of the program, a 125 Hz instruction signal called a DK signal for instructing the start of the traffic information,
The 57 kHz SK signal is amplitude-modulated and transmitted together with the SK signal. Therefore, the receiver is constructed so as to reliably receive the traffic information by detecting the SK signal to cancel the muting or increase the volume.

Also, many traffic information receiving devices equipped with sound reproducing devices such as CDs and tapes are commercially available. Even when playing a CD or tape with such a device, the DK signal can be detected by maintaining the FM receiving circuit in an operating state, and the CD or tape is automatically switched to the FM to listen to traffic information. An apparatus capable of performing the above has been developed (for example, Japanese Patent Laid-Open No. 64-81531).

[0004]

However, generally, a radio is a multi-band having not only FM but also MW, SW, LW and the like. In this case, since the traffic information is carried out only in the FM band, MW, SW, L other than the FM band are used.
I was not able to hear traffic information when setting the reception for the W band. Therefore, in order to receive traffic information even while receiving a band other than the FM band, it is necessary to keep the receiving circuit of the FM band in the receiving state at all times. In the electronic tuning receiver of the system, since the PLL circuit is shared by each band, the other band cannot be received while any band is operating. FIG. 3 shows a conventional example FM / M.
It is a block diagram adapted to the traffic information receiver which can receive W band. The FM receiving circuit (2) and the MW receiving circuit (6) also serve as the PLL unit (26) necessary for tuning to a predetermined frequency, and the band changing switch (21c) is adjusted by the control of the control circuit (16). PL that can be switched
The connection of the PLL section (26) is switched by the L changeover switches (21a) (11b). When the band changeover switch (21c) is switched to the FM receiving circuit (2) side, the control circuit (16) controls the PLL circuit (10) having the PLL unit (26), so that the FM receiving circuit (2) ) Is stepped in a predetermined frequency range for each predetermined frequency, and a search is performed so that the SDK detection circuit (11) detects a traffic information signal from radio waves received via the antenna (9). You can Therefore,
When the band changeover switch (21c) is switched to the MW receiving circuit (6) side, the PLL circuit (10) becomes F
Since the M receiving circuit (2) is not operated, the FM receiving circuit (2) is not in the operating state and cannot detect the traffic information signal coming into the FM receiving circuit (2). In the traffic information receiving device equipped with such a multi-band radio receiving unit and a sound reproducing device such as a CD or a tape,
The power of the radio receiver remains on even when playing D or tape. This is to quickly call the previous broadcasting station (last channel) when returning to the original band. Therefore, if the band switch is set to FM when playing a CD or tape, F
Since the M band is in the operating state, the traffic information can be heard by interruption, but the traffic information cannot be heard when the MW, SW or LW other than FM is set. Therefore, in order to hear the traffic information by interruption, it is necessary to manually switch the band changeover switch to the FM side. This increase in the number of operations is not preferable in terms of traffic safety.

[0005]

The present invention has been made in view of the above points, and is characterized in that when the traffic information key is operated while the control circuit is selecting the mode of the sound reproducing device, the F
When the M receiving circuit is activated and the DK signal reception is detected,
Controlling the selection means to select the output of the FM receiving circuit.

[0006]

In a traffic information receiving device equipped with a radio receiving circuit having bands other than FM such as MW, SW, LW, and a sound reproducing device such as CD or tape, the radio band is set to other than FM. Even if the traffic information key is pressed while the CD or tape is being reproduced, the FM receiving circuit is held in the operating state, so that the SK signal and the DK signal can be detected and the traffic information can be received by interruption.

[0007]

Embodiments of the present invention FM having a CD player
/ MW radio receiver, and will be described with reference to the drawings. FIG. 1 is a block diagram showing the main part of this receiver. In comparison with FIG. 3, the same parts are designated by the same reference numerals. (1) is a radio receiver that receives FM and MW broadcasts including traffic information. (2) is an FM receiving circuit, which comprises an FM front end (3), an FM-IF detector (4) and an FM stereo demodulation circuit (5). (6) is an MW receiving circuit, which comprises an MW tuner (7) and an MW-IF detector (8). The FM front end (3) and the MW tuner (7) amplify the signal received from the antenna (9) into a high frequency signal, mix the high frequency signal and the oscillation signal from the PLL circuit (10), and output the intermediate frequency signal (IF ) Is output. The FM-IF detector (4) and the MW-IF detector (8) are respectively for the intermediate frequency signals output from the FM front end (3) and the MW tuner (7).
Performs detection and MW detection. The FM stereo demodulation circuit (5) reproduces the L channel and R channel signals using the stereo composite signal input from the FM-IF detector (4), and outputs each channel signal. Reference numeral (11) is an SDK detection circuit that detects an SK signal (a signal indicating a station that broadcasts traffic information) and a DK signal (a signal that identifies a message) in the European ARI. Reference numeral (12) denotes an operation unit, which includes at least a traffic information key (13) for listening to traffic information, a band key (14) for switching between FM and MW of the radio, and a switching operation between the radio and the CD player. It has a mode key (15) for performing. A control circuit (16) includes an SDK detection circuit (11) and an operation unit (1).
The PLL circuit (10) is controlled based on 2). (17)
Is a ROM and stores a program for operating the control circuit (16). (18) is a RAM, which stores data necessary for the operation of the control circuit. A display device (19) displays what the sound output from the speaker (20) is, for example, the frequency of the broadcasting station or the station number of the CD. Reference numeral (21c) is a band changeover switch, which is switched to either the output of the FM stereo demodulation circuit (5) or the output of the MW-IF detector (8) under the control of the control circuit (16). Further, as described above (FIG. 3), the control circuit (16) connects the PLL circuit (10) to the FM receiving circuit (2) and the MW receiving circuit (6) according to the switching direction of the band changeover switch (21c). Switch. (22) is a CD player. Reference numeral (23) is a mode changeover switch, which is switched to either the output from the band changeover switch (21c) or the output of the CD player under the control of the control circuit (16). Reference numeral (24) is a low-frequency amplifier circuit, which amplifies the output of the connected FM stereo demodulation circuit (5) or the MW-IF detector (8) or the output of the CD player, and outputs the sound through the speaker (20). Convert it. Thus, in this embodiment, the output of the FM receiving circuit (2), the output of the MW receiving circuit (6), and the CD player (22).
Is selected by the selection means (25) including the band changeover switch (21c) and the mode changeover switch (23). In the above configuration, the traffic information key (1
Even when switched to the CD mode side by 3),
The output of the PLL circuit (10) is given in the same state as the receiving circuit of the band selected before the switching.

The operation of the control circuit (16) having the above configuration will be described with reference to the drawings. FIG. 2 is a flowchart showing the operation of the control circuit (16). When the traffic information key (13) for instructing the start of receiving the SDK signal is pressed (Y in S1), it is checked whether or not the mode changeover switch (23) is set to the CD side (band changeover switch side) (S).
2). If it is not on the CD side (N in S2), other processing is performed. The other processing is a band changeover switch (21
If c) is the FM receiving circuit (2) side, the SK signal is searched to receive the traffic information, and if it is the MW receiving circuit (3) side, the process returns to step S1. If the mode selector switch (23) is set to the CD side in step S2 (Y in S2),
It is checked whether the band change switch (21c) is on the FM side (S4). If it is not on the FM side (N of S4), the band change switch (21c) is changed to the FM side (S5). At this time, the switching is stored in the RAM (18). Then, the search for the 57 kHz SK signal is started (S6). The FM receiving circuit (2) and the PLL circuit (10) search for an FM broadcast signal of a first level or higher while increasing the frequency in a predetermined frequency range in predetermined steps, and when an FM broadcast signal of a predetermined level or higher is detected, The FM is detected by the SDK detection circuit (11).
It is checked whether or not there is a SK signal in the broadcast signal. If there is a SK signal, the search is terminated, and then it is checked whether or not there is a DK signal (S7). When there is no FM broadcast signal of the first level or higher, the frequency is lowered to the second level lower than the first level and the predetermined frequency range is searched again. If there is no SK signal even in the search at the second level or higher, step S1
Return to (not shown). If there is a DK signal in step S7, it is determined that the traffic information can be received, and the mode selector switch (23) is switched to the radio side so that the traffic information can be heard (S8). At this time, RA
It is stored in M (18). Then, the display device (19) displays that the traffic information is being received (S9). As a result, it is possible to automatically hear the traffic information even when playing the CD. While receiving the DK signal, listen to the traffic information (Y of S10), and when the DK signal is not received (N of S10), the mode selector switch (23) is returned to the CD side (S11).

In the flow chart of FIG. 2, once the DK signal is cut off and the mode returns to the CD mode, the traffic information key (13) must be pressed again to hear the traffic information again. It is possible to listen to the traffic information as many times as necessary until it is canceled.

Further, in steps S5 and S8, RAM (1
Although it was memorized that it switched to 8), it is possible to return to the original switching state by this information when the interruption reception of the traffic information is finished in step S11 or the traffic information key (13) is released. is there.

Further, in this embodiment, when the traffic information key (13) is pressed during reproduction of the CD, the control circuit (16) sets the PLL changeover switches (21a) (21b) to the band changeover switch (21c). To the FM receiver circuit (2) side. However, as for the band changeover switch (21c), the mode changeover switch (23) is the band changeover switch (2).
It is not necessary to switch to the FM receiving circuit (2) side until switching to the 1c) side. Therefore, the control circuit (16) is
After the L changeover switches (21a) and (21b) are changed over to the FM receiving circuit (2) side, the band changeover switch (21c) may be changed over to the FM receiving circuit (2) side when the SK signal or the DK signal is detected. .

[0012]

In the traffic information receiving apparatus having the radio receiving section having a plurality of bands including FM and the CD or tape, even if the radio band is set to other than FM, the traffic information key is being reproduced while the CD or tape is being reproduced. By pressing, the traffic information can be heard by interruption without the operation of returning the radio band to the FM. Radio band is usually F
To return to M, it is necessary to operate the mode key and band key, and the fact that these operations can be omitted means that you can listen to traffic information with the same operation as a device that has only FM even for multiple bands. However, it is possible to supply a multi-band device whose operability does not change. Further, it is a useful function for traffic safety for the traffic information receiving device mounted on the vehicle.

[Brief description of drawings]

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

FIG. 2 is a flowchart showing an example.

FIG. 3 is a block diagram showing a conventional example.

[Explanation of symbols]

 1 Radio Reception Section 2 FM Reception Circuit 6 MW Reception Circuit 10 PLL Circuit 11 SDK Detection Circuit 13 Traffic Information Key 14 Band Key 15 Mode Key 16 Control Circuit 18 RAM 21a PLL Change Switch 21b PLL Change Switch 21c Band Change Switch 22 CD Player 23 Mode changeover switch 25 Selection means 26 PLL section

Claims (1)

[Claims] 1. An FM receiving circuit and D from the FM receiving circuit
Any one of a DK detection circuit that detects a K signal, a radio reception circuit other than FM, a sound reproduction device that outputs a signal other than radio, the FM reception circuit, a radio reception circuit other than FM, and a sound reproduction device. A selection means for selecting an output, a traffic information key for operating reception of traffic information, a band key for switching between FM and other bands, a mode key for switching between a radio mode and a mode of the sound reproducing device, and each of the above. While controlling each circuit based on the key, when switching to the mode of the sound reproducing device, the receiving circuit corresponding to the radio band before switching to the mode of the sound reproducing device is held in the operating state, and the radio mode is set. In the control circuit that selects the output of the receiving circuit of the radio band that is in operation when switched, the control circuit is a mode of the sound reproducing device. When the traffic information key is operated while selecting, the FM receiving circuit is activated and the selection means is controlled to select the output of the FM receiving circuit by detecting the reception of the DK signal. Information receiving device.