JPS637491B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a receiver that has one or more tuning keys and is equipped with a memory device that can store tuning data for a plurality of stations for each tuning key. .

Conventionally, a receiver equipped with an electronic memory device is configured to store tuning data for only one station in the same band for each of a plurality of tuning keys. For fixed receivers,
By storing stations with good reception conditions in the area for these tuning keys, it is possible to always select a good reception station with a single tuning operation. However, with car-mounted receivers, when the receiver is moved, the reception status may become extremely poor as the station moves out of the service area of the stored station, and in this case, the user is forced to perform the tuning operation again. .
When the range of movement becomes large, the receiver often has to perform this tuning operation, making the receiver extremely troublesome.

In view of the above points, the present invention has been made to improve this problem.If a plurality of stations are stored in advance for a tuning key, the stored channels can be used while the tuning key is being selected. It is possible to continue receiving the station at the relatively strongest level among multiple stations, and if you memorize each station on your moving course, you do not have to manually select the station each time you move. provide.

In the present invention, an arbitrary channel selection key is selected, and the reception of the first broadcasting station that is currently receiving any of the stations stored in that channel selection key is periodically interrupted, and the Receive another second broadcast station stored for the same channel selection key as the first broadcast station, compare the reception level of the first broadcast station and the reception level of the second broadcast station, The frequency of checking the reception level of the second broadcasting station is changed depending on the reception level of the first broadcasting station currently being received by a receiver configured to receive stations with relatively good reception level. If the first broadcasting station is received relatively well, the first broadcast station is received at a slower frequency, and when the reception condition is getting worse, it is transmitted at a faster frequency. If you can find a good station and the reception is relatively good, it is rare for the reception condition to deteriorate suddenly, so you can check other stations slowly, and the noise that occurs when checking other stations can be avoided. It is possible to construct a very practical receiver.

An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, an antenna 1 is connected to a tuner 2, and a signal is supplied to the tuner 2. A part of the signal is taken out from the tuner 2 to the level judgment circuit 3, and the output of the level judgment circuit 3 is sent to the averaging circuit 4.
and is led to the input of one level comparison circuit 5. The output of the tuner 2 is sent to the muting circuit 6.
The signal passes through a low frequency amplifier 7 and is guided to a speaker 8. The channel selection device 9 includes channel selection keys 91, 9.
There are 2,93. The channel selection device 9 is connected to a control section 11 composed of a microcomputer or the like. There are many data areas inside the memory device 10, and each data area can store one piece of tuning data. In this example, data areas 101 to 109 are assigned to the channel selection key 91, data areas 201 to 209 are assigned to the channel selection key 92, and data areas 301 to 309 are assigned to the channel selection key 93. It is possible to store up to 9 stations for each channel selection key. Now, for example, when the channel selection key 91 is selected, this selection signal is sent to the control unit 11, and the control unit 11 transfers arbitrary data from the data areas 101 to 109 of the memory device 10 to the current data memory 13. Since it is easy to store in the control unit 11 the station that was last received when this tuning key was selected last time, in this example, the tuning data that is first transferred to the current data memory 13 is: This is the last station that was received when this selection key was selected last time.

The tuning data for this station is transferred to the current station data area 14 in the current data memory 13, and at the same time, the next stored tuning for this station is transferred to the inspection station data area 15. For example, if the tuning data of the first broadcast station is the tuning data of the data area 103, the tuning data of the data area 104 is transferred to the inspection station data area 15. Now, the tuning data of the current station data area 14 is sent to the tuning voltage generation circuit 16, and the output of the tuning voltage generation circuit 16 is guided to the varactor diode 17 of the tuner 2. This tuning voltage generation circuit 16 can easily be constructed from a PLL synthesizer, for example. Now, reception is started using the tuning data in the current station data area 14. The reception status of the first broadcasting station currently being received is determined by taking out the output of the level judgment circuit 3 to the averaging circuit 4 using an appropriate periodic signal from the control unit 11, and the averaging circuit 4 The levels are accumulated and averaged, and the averaged output is led to the other input of the level comparison circuit 5. The output of the averaging circuit 4 is also led to the control section 11, and the reception state of the inspection station is periodically checked at a cycle according to this level. This operation begins with the control section 11 supplying a signal to the muting circuit 6 to interrupt the audio. Next, the tuning data in the current station data area 14 and the inspection station data area 15 of the current data memory 13 are exchanged, and the tuning data in the original inspection station data area 15 is received. Next, the output of the level determination circuit 3 and the output of the averaging circuit 4 are instantaneously compared by the level comparison circuit 5, and an output corresponding to the result is supplied to the control section 11. As a result, if the inspection station is at a lower level, the current station data area 14 and inspection station data area 1 of the current data memory 13 are
5 is replaced, the control section 11 cuts the signal to the muting circuit 6, cancels the audio interruption, and transmits the tuning data of the next data area, in this example, the tuning data of data area 105 to the inspection station. Transfer to data area 15.

Reception of this inspection station is carried out periodically at a period according to the reception level of the first broadcasting station, for example, if it is relatively bad, it is a 1 second period, and if it is relatively good, it is a 5 second period. In this way, by sequentially switching and checking the data of the inspection station, for example, if at some point the reception status of the inspection station is higher than the current level,
That is, when a certain inspection station is received, the output of the averaging circuit 4 and the output of the level judgment circuit 3 are compared to the level comparison circuit 5.
If the output of the level determination circuit 3 is higher than the output of the level comparison circuit 5, the control section 11 detects the output of the level comparison circuit 5 and compares the current station data area 14 of the current data memory 13 with the inspection station data. Without replacing the contents of area 15,
The signal to the muting circuit 6 is cut off to cancel the audio interruption, and the tuning data in the data area is then transferred to the inspection station data area 15. In this way, the current receiving station is switched to a station with better reception conditions. This corresponds to automatically switching to another station when you move away from the service area of the station you are currently receiving and enter the service area of another station.

Among the above operations, the functions of the control section 11 are expressed in a flow diagram as shown in FIG. 2.

In this way, according to the present invention, if several stations in a moving course are stored in advance for the same channel selection key, even when moving, the station automatically selects the highest station among them. It is possible to provide a receiver that can continue to receive stations at a certain level.

Incidentally, it is preferable that the first station to be received when a channel selection key is selected is the station that has the best reception condition among the stations stored for that channel selection key. To achieve this, the reception status of all stations may be checked at the moment the channel selection key is pressed, and the station with the best reception status may be selected and set as the current reception station. The moment of channel selection is several tens of milliseconds
Even if there is a muting time of about 500 ms, there is no sense of strangeness, so the averaging circuit 4 functions as a memory circuit for the reception status of the first broadcasting station by the above operation, and the inspection stations are replaced one after another before canceling the mutating. Muting can be canceled once all the stations in the memory corresponding to that selection key have been checked. This corresponds to setting the cycle of checking other stations to zero. At this time, the station with the best reception status is the first station currently receiving the signal.
It is clear that it has become a broadcasting station.

It is also effective to perform such an operation of checking all stations at once when the reception condition of the current receiving station suddenly deteriorates.

As described above, according to the present invention, it is possible to realize a very convenient receiver for use in a vehicle. The stations stored for the same selection key can be used in various ways, such as stations running the same program, or stations having broadcast content of the same genre. Particularly when driving long distances, you are freed from the troublesome tuning operation, making the drive truly comfortable.

[Brief explanation of the drawing]

FIG. 1 is a book diagram showing one embodiment of the present invention, and FIG. 2 is a flow diagram showing the functions of the control section. DESCRIPTION OF SYMBOLS 1...Antenna, 2...Tuner, 3...Level judgment circuit, 4...Averaging circuit, 5...Comparison circuit, 6...Muuting circuit, 7...Low frequency amplifier, 8...Speaker, 9... ...Tuning device, 91,
92, 93...Tuition selection key, 10...Memory device, 11...Control unit, 13...Current data memory, 14...Current station data area, 15...
...Inspection station data area, 16...Tuning voltage generation circuit, 17...Varactor diode.

Claims (1)

[Scope of Claims] 1. A memory device that stores tuning data corresponding to a plurality of broadcast stations, a tuner that receives tuning data according to the tuning data selected from the memory device, and a tuning frequency of the tuner that changes. A tuning voltage generating circuit, a means for determining the level of the received signal selected by the tuner, and a means for interrupting reception at a period according to the level of the received signal so that radio waves of other frequencies can be received at the time of interruption. In addition, based on the comparison result between the level of the received signal of the other frequency received at the time of the interruption and the level of the received signal of the interrupted frequency, reception of the radio wave of the frequency whose received signal level is higher. A receiver comprising a control section that controls the tuning voltage generation circuit so as to continue the tuning voltage generation circuit. 2. Claim 1, characterized in that the control unit controls the reception interruption cycle to be slow when the level of the signal being received is high and to be fast when the level of the signal is low. Receiver as described.