JPH03280637A - Wire receiver - Google Patents

Abstract

PURPOSE:To easily find out fault by providing a channel reception state storage section, displaying the abnormal reception state of a channel reception state storage section onto a display section and avoiding search of selective fault reception state against a frequency division ratio outputted independently of plural broadcast channels. CONSTITUTION:This receiver is provided with a channel reception state storage section 13 and a display section 14. Then the channel reception state storage section 13 stores a level signal VL from an intermediate frequency amplifier section 7 caused attended with a frequency division ratio outputted corresponding to plural broadcast channels at a prescribed interval from a frequency division ratio setting section 12 and the abnormal reception state of the channel reception state storage section 13 is displayed on the display section 14. Then one of plural abnormal reception states is displayed on the display section 14 and the abnormal reception states are displayed one by one selectively, and when the abnormal reception state takes place against a frequency division ratio independently of plural broadcast channels, the plural abnormal reception states are not selectively searched. Thus, the fault of the receiver for a wired line is easily found out.

Description

[Detailed Description of the Invention] [Summary] The present invention provides an intermediate signal that occurs when a frequency division ratio is output from a frequency division ratio setting section at regular intervals corresponding to a plurality of broadcast channels by inputting a signal that requires abnormality diagnosis. The channel reception state storage section stores the level signal from the frequency amplification section, displays the abnormal reception state of the channel reception state storage section on the display section, and furthermore, the frequency division ratio setting section receives the abnormal reception state by inputting the abnormality diagnosis signal. Before outputting a frequency division ratio corresponding to a plurality of broadcast channels, a frequency division ratio unrelated to the plurality of broadcast channels is output, and the display section displays one state among a plurality of abnormal reception states, A wired receiving device that performs a moving search for receiving states one by one, and further prevents a moving search for a plurality of abnormal receiving states in the case of an abnormal receiving state for a frequency division ratio unrelated to the plurality of broadcast channels, the wired receiving device Device failures can be easily discovered and power consumption can be reduced.

[Industrial application field]

TECHNICAL FIELD The present invention relates to a wired receiving device that retransmits radio broadcasts using the wired equipment of a mobile body that receives broadcast radio waves and receives the radio broadcasts by receivers at each seat of the mobile body.

In particular, the present invention refers to abnormality diagnosis that can easily detect failures in wired receiving devices at an early stage.

[Conventional technology]

FIG. 8 is a diagram showing a conventional wired receiving device.

Note that similar components are represented by the same reference numerals or symbols throughout the drawings. The configuration of this figure will be explained. This figure shows an antenna l that receives broadcast radio waves, a reception and retransmission unit 2 that modulates the received signal of the antenna 1 to a fixed frequency of a plurality of broadcast channels and retransmits it, and a coaxial cable connected to the reception and retransmission 82. A known wired receiving device is shown that includes a cable 3 and a number of receivers 4-1, 4-2, . . . , 4-n connected to the coaxial cable 3. FIG. 9 is a diagram showing a broadcast station selection section in each receiver in FIG. 8. This figure shows a mixer section 6 that converts an input signal V into an intermediate frequency signal, an intermediate frequency amplification section 7 that amplifies the intermediate frequency signal of the mixer section 6, and a phase lock that supplies a local oscillation signal to the mixer section 6. Loop section 11 and broadcast channel change signal V
A frequency division ratio setting unit 1 that sets a frequency division ratio corresponding to the broadcast channel in the phase-locked loop unit 11 upon input of .
2 and a known superhetero gain system configuration using a frequency synthesizer including a display section 14 that lights up and displays the frequency division ratio set by the frequency division ratio setting section 12 in the phase-locked loop section 11 as a broadcast channel. Next, the operation will be explained. In FIG. 8, the broadcast radio waves received by the antenna 1 are modulated into a plurality of fixed frequencies corresponding to the broadcast radio waves by the reception and retransmission unit 2, and are transmitted via the coaxial cable 3.
It is input to each receiver 4-i4-2, . . . , 4-n. In FIG. 9, each of the receivers 4-1, 4-2, . . .
The signal V inputted to 4-n is converted to a constant intermediate frequency by the local oscillation signal from the phase-locked loop 11 in the mixer section 6 using the super-hetero gain method, amplified by the intermediate frequency amplification section 7, and reproduced with earphones. be done. Passengers receive a broadcast channel change signal V by pressing a button (not shown)
, the broadcast channel is changed by changing the frequency division ratio of the frequency division ratio setting section 12 to be set in the phase lock loop 11 while looking at the indicator light of the display section 14. The wired receiver thus provided high quality information, music, etc. to a large number of passengers in a mobile vehicle.

[Problem to be solved by the invention]

However, in conventional wired receiving devices, if there is a failure, it is very difficult to detect it, and if the failure is left untreated, the device cannot be used effectively. This is because, in the event of a failure in each unit that modulates the fixed frequency of a plurality of broadcast channels constituting the reception and retransmission unit 2, it is necessary to check whether or not each broadcast station has reproduced sound. Furthermore, if there is a failure in the coaxial cable 3, no sound will be reproduced for all channels, but if there is a failure in the receiver itself, it must be identified. Therefore, the crew of the mobile vehicle had to check the playback sound from all the receivers individually through earphones, making it difficult to easily discover malfunctions.

Therefore, in view of the above-mentioned problems, it is an object of the present invention to provide a wired receiving device that facilitates the discovery of failures.

[Means to solve the problem]

FIG. 1 is a diagram showing the basic configuration of the present invention. The wired receiving device of the present invention includes a channel reception state storage section 13, and the channel reception state storage section 13 is configured to respond to the plurality of broadcast channels from the frequency division ratio setting section 12 at regular intervals in response to the input of the abnormality diagnosis request signal Vs. A level signal V from the intermediate frequency amplification section 7 generated in accordance with the output frequency division ratio is stored. Furthermore, the frequency division ratio setting section 12 outputs an abnormality diagnosis signal V.
By inputting s, a frequency division ratio unrelated to the plurality of broadcast channels is output before outputting a frequency division ratio corresponding to the plurality of broadcast channels.

[For production]

In FIG. 1, the abnormal reception state of the channel reception state storage section 13 is displayed on the display section 14.

One of the plurality of abnormal reception states is displayed on the display section 14, and the abnormal reception states are searched one by one. , multiple abnormal reception states are not searched. Therefore, failures in the wired receiving device can be easily discovered, and power consumption can also be reduced.

〔Example〕

Embodiments of the present invention will be described in detail below with reference to the drawings. FIG. 2 is a diagram showing a wired receiving device according to an embodiment of the present invention. The configuration of this figure will be explained. This diagram shows antenna 1
For example, 8 channels of broadcast radio waves received on FM (
Frequency Modulation) Each carrier requires an oscillator unit for modulation) (C) II2,...
, 8) from the reception/retransmission unit 2 via the coaxial cable 3 to a plurality of receivers 4-1.4-2. ...
, 4-n, and is mounted on a moving body such as a mass transportation means such as an express train, bus, or airplane, and provides music and information to passengers in each seat.
-1, 4-2..., 4-n are a high frequency amplification section (RF) 5 connected to the coaxial cable 3, and a mixer (RF) that converts the input signal v1 from the high frequency amplification section 5 into an intermediate frequency signal. MIX) section 6 amplifies the intermediate frequency signal of the mixer section 6 to a signal V0 used as a reproduction signal, and compares the averaged signal after detecting and rectifying the amplified signal with a reference signal to obtain the averaged signal. is higher than the reference signal, “L”
an intermediate frequency amplification section (IF) 7 that outputs a level signal VL which is an "H (High)" signal when the signal is low, and a detection section (DET) that detects the amplified signal V of the intermediate frequency amplification section 7. 8, a power amplifier 1 (AI, tP) 9 for power amplifying the demodulated signal of the detection section 8, an earphone 9 for reproducing the amplified signal of the power amplifier section 9, and supplying a local oscillation signal to the mixer section 6. a phase-locked loop section (PLL) 11 for inputting a broadcasting channel change signal V and an abnormality diagnosis mode request signal v5 to the phase-locked loop 11, and a frequency division ratio setting section that supplies a frequency division ratio corresponding to the broadcasting channel. 12, and a level from the intermediate frequency amplification section 7 that is generated in accordance with the frequency division ratio outputted from the frequency division ratio setting section 12 at regular intervals corresponding to the plurality of broadcast channels in response to the input of the abnormality diagnosis request signal V5. a channel reception state storage unit 13 that stores the signal V;
It includes a display section 14 that receives the frequency division ratio from the frequency division ratio setting section 12 and displays the received broadcasting channel, and further displays the abnormal reception state of the channel reception state storage section 13. Note that the reception and retransmission unit 2 is installed in the central control room of the mobile object, and the abnormality diagnosis mode request signal Vs is sent from the central control room at the time of the crew's initial inspection. The broadcast channel change signal vd is generated by the channel up/down button in response to a passenger's tuning request.

FIG. 3 is a diagram showing the relationship between the frequency division ratio corresponding to the broadcast channel and the level signal of the intermediate frequency amplification section when the abnormality diagnosis mode is requested. In this figure (a), when the abnormality diagnosis mode request signal Vs is input to the frequency division ratio setting section 12, for example, C111. CI(
2, . This diagram (b) shows that the level signal vL is “L”
'' indicates that the reception condition is good, and "H" indicates that there is an abnormality. In this case, CH2 is "H".
Therefore, it indicates that there is an abnormality in the CH2 carrier wave oscillator unit of the reception and retransmission section, and this is displayed on the display section 14.
This example shows that the other channels are normal. If an abnormality occurs in antenna 1 or coaxial cable 3, all channels (CHI, CH2,..., CH8
) Telelevel signal VL becomes "H". In this case, if all the indicator lights of all the seats blink, the power consumption will become too large, so a solution to this problem will be described later.

FIG. 4 is a diagram showing frequency division ratios unrelated to broadcast channels that are added before the series of frequency division ratios corresponding to the broadcast channels shown in FIG. 3 when requesting abnormality diagnosis mode. First, the level signal V of the intermediate frequency amplification section 7 of the receiver may remain at "H" or "L" if there is an abnormality due to a failure in the receiver.

When the level signal VL remains "H", the display section 1
4 is displayed blinking, allowing you to detect an abnormality, but the level signal VL
If it remains "L", no blinking is displayed on the display unit 14, so an abnormality due to a failure cannot be detected. This figure (a)
The frequency division ratio of CHO is the CH corresponding to other broadcast channels.
, CH2,..., CH8, so even if it is supplied to the phase-locked loop section 11, the mixer section 6 cannot generate an intermediate frequency signal, and if it is normal, the intermediate frequency signal will be , the level signal VL becomes "H". Therefore, when the level signal VL maintains "L" when there is a frequency division ratio based on CHO, it can be determined that there is an abnormality.

FIG. 5 is a diagram showing the display state of the display section. In this figure, numbers 1, 2, 3. . . , 8 indicates broadcast channels. Each broadcast channel is provided with an indicator light made of, for example, an LED, and the broadcast channel at the time of reception is indicated by lighting.

As shown in FIG. 3, when an abnormality diagnosis mode is requested and there is an abnormality in channel 2, the indicator light flashes.

Next, the operation of this embodiment will be explained. FIG. 6 is a flowchart at the time of reception. In this figure, the receiver is turned on (step 1), and it is determined from the content heard through the earphone 10 whether or not the current channel is the desired channel (step 2). If you want to change the broadcast station, turn up or down the channel using a button (not shown), input the broadcast channel change signal V to the frequency division ratio setting section 12,
Change the frequency division ratio setting (step 3). If it is the desired channel in step 2, it is received (step 4).

FIG. 7A is a diagram showing a flowchart in the abnormality diagnosis mode. The abnormality diagnosis mode request in this figure is made by a crew member before the start of work, and the presence or absence of an abnormality is checked. In this figure, when the abnormality diagnosis mode request signal VS is input to the frequency division ratio setting section 12, the frequency division ratio of channel 0 is supplied to the phase lock loop 11 (step 1). Set ordinal number 1 to 1-1 (step 2). Wait 100 msec after supplying the frequency division ratio (step 3). This is to ensure the lock-up time of the phase-locked loop 11. It is determined whether the level signal VL of the intermediate frequency section 7 is "H" (step 4). If the level signal VL is "H", the ordinal number 1 is set to 2 (step 5), waits for 50 msec (step 6), and returns to step 4. Level signal VL
If not "H", an error flag is set in the channel reception storage section 13 using the channel as an address (step 7). In this case, channel 1 of the display section 14
The indicator light blinks (Step 8), and the process ends (Step 9). Indicates a malfunction and performs repairs. In this way, if the level signal vL is not "H" even once in two determinations, that is, if it is "L", it is determined to be abnormal, thereby improving reliability.

The reason why the process ends at step 9 is because there is an abnormality in the receiver, so there is no point in performing the following operations. Next, if there is no abnormality, then the channel is added by 1 and the frequency division ratio of channel 1 is supplied to the phase-locked loop 11 (step 10).

Set ordinal number 1 to 1=1 (step 11). After supplying the frequency division ratio, wait 100 msec (step 12). This is for the same reason as above. Next, it is determined whether the level signal VL is "L" (step 13). If the level signal Vt is "L", the ordinal number i is set to 2 (step 14), waits for 50 msec (step 15), and returns to step 13. If the level signal V becomes "H" even once out of the two determinations, an error flag is set in the channel reception storage section 13 (step 16).

In step 17, it is determined whether the indicator light 14 is blinking (step 17), and if it is not blinking, it is blinked (step 18), and if it is already blinking, the process returns to step 14. In this way, channels with smaller ordinal numbers are stored. Therefore, it can be determined that there is no abnormality in channels smaller than the blinking channel ordinal number. Repeat the above operations up to channel 8 (step 19)
), so return to step 10.

Figure 7B is a flowchart in the abnormality diagnosis mode.
This is a continuation of the figure. This diagram shows the channel reception status storage unit 13.
This figure shows a flow of sequentially accessing the error flags set in , displaying them on the indicator lights of the display unit 14, and moving and searching for abnormal reception status one by one. In this figure, it is determined whether the indicator light of the display unit 14 is blinking (step 20). If there is no blinking, the process ends (step 21). As a result of the inspection, the fishing was found to have no abnormalities. Next, the error flag of each channel is accessed from the channel reception storage section 13 by raising/lowering the channel using a button (not shown) (step 22). If there is no error flag, display section 1
Step 24) Return to step 22 to turn on the indicator light of channel N of 4. If there is an error flag in step 23 and the error flag is on channel 0 (step 25), the channel 1 indicator light on the display section 14 will blink (step 26), and the process will end (step 21). If the error flag is not channel 0, display 81
4, channel N indicator light blinks (step 26)
. The instructions for termination are repeated (steps 22, 21) until the central control room is located (step 27). In this way, the display section 14 displays one of the plurality of abnormal reception states, and an abnormal channel can be detected while preventing an increase in the power of the indicator light. Incidentally, when channel 1 blinks, an abnormality in channel 1 of the carrier wave oscillator unit and an abnormality in the receiver overlap, but in the case of an abnormality in the receiver, if channel 1 blinks, the mobile search cannot be performed thereafter, so they can be distinguished.

In addition, in this implementation, the broadcast radio waves are retransmitted to each receiver by the reception and retransmission section, but it is also possible to retransmit the audio signals from other audio devices, such as tape players, digital audio discs, etc. to each receiver. You can also do this.

〔Effect of the invention〕

As explained above, according to the present invention, in response to the input of the abnormality diagnosis request signal, the intermediate frequency amplifying section generates an output signal from the intermediate frequency amplifying section that is generated in accordance with the dividing ratio that is output from the dividing ratio setting section at regular intervals corresponding to a plurality of broadcast channels. a channel reception state storage section that stores a level signal of the channel reception state storage section, displays the abnormal reception state of the channel reception state storage section on the display section, and further includes a frequency division ratio setting section that sets the channel reception state to the plurality of broadcast channels by inputting an abnormality diagnosis signal. Before outputting the corresponding frequency division ratio, a frequency division ratio unrelated to the plurality of broadcast channels is output, the display unit displays one state among the plurality of abnormal reception states, and the abnormal reception state is moved one by one to be searched. However, in the case of an abnormal reception state for a frequency division ratio unrelated to the plurality of broadcast channels, the mobile search for multiple abnormal reception states is not performed, so a failure of the wired receiving device can be easily discovered and power consumption can be reduced. It is hoped that this will also be possible.

[Brief explanation of drawings]

Fig. 1 is a diagram showing the principle configuration of the present invention, Fig. 2 is a diagram showing a wired receiving device according to an embodiment of the present invention, and Fig. 3 is a diagram showing the frequency division ratio corresponding to the broadcast channel when requesting abnormality diagnosis mode. A diagram showing the relationship with the level signal of the intermediate frequency amplification section. Figure 4 shows a frequency division unrelated to the broadcast channel that is added before a series of frequency division ratios corresponding to the broadcast channels shown in Figure 3 when requesting abnormality diagnosis mode. Figure 5 is a diagram showing the display state of the display unit, Figure 6 is a flowchart during reception, Figure 7A is a flowchart in abnormality diagnosis mode, and Figure 7B is a diagram showing the display state of the display unit.
8 is a flowchart in the abnormality diagnosis mode, FIG. 8 is a diagram showing a conventional wire receiving device, and FIG. 9 is a section showing a broadcast station selection section in each receiver in FIG. 8. In the figure, 6... Mixer section, 7... Intermediate frequency amplification section, 11... Phase lock roof section, 12... Frequency division ratio setting section, 13... Channel reception state storage section, 14. ...Display section.

Claims (1)

[Claims] 1. A reception and retransmission unit (2) that modulates and retransmits a signal received from an audio signal source to a plurality of broadcast channels, and a transmission line connected to the reception and retransmission unit (2). (3), and a plurality of receivers (4-1) that receive signals from the transmission line (3).
, 4-2, . A channel reception state storage unit (13) that stores
) and a display section (14) that displays an abnormal reception state in the channel reception state storage section (13). 2. Upon input of the abnormality diagnosis request signal (V_s), the reception and retransmission unit (2) transmits a signal on a broadcast channel unrelated to the plurality of broadcast channels, and the receiver receives the unrelated selected channel. The wired receiving device according to claim 1, which displays an abnormal reception state. 3. The wired receiving device according to claim 1, wherein the display section 14 displays only one of the plurality of abnormal reception states. 4. The wired receiving device according to claim 3, wherein the abnormal reception state displayed on the display section 14 is searched one by one by operating a channel changeover switch. 5. The wired receiving device according to claim 4, wherein if there is an abnormal reception state for a broadcast channel unrelated to the plurality of broadcast channels according to claim 2, the mobile search for the plurality of abnormal reception states is not performed.