JPH03159415A - Electronic tuner - Google Patents

Abstract

PURPOSE:To instantaneously channel-selecting a broadcasting radio wave having the strongest electric field strength even if a system is switched to a second function by selecting plural broadcasting radio wave whose electric field strength is strong among the broadcasting radio waves of plural selected channels. CONSTITUTION:A reception operation is to output an intermediate frequency signal from an IF amplifier based on the received broadcasting radio wave and to detect the electric field strength in an electric field strength detection part 3. A higher channel selection part 5 selects the highest five channels of the broadcasting radio wave whose electric field strength is strong among detected electric field strength and the specified channel and they are stored in a memory 7. When a switch changing over from a first function to the second function is turned on, a controller 6 inputs a switch command to the function switch part 2, reads broadcasting radio wave data on the highest five channels whose electric field strength is strong, which are stored in the memory 7 and inputs them in a PLL circuit 9. A mixer speedily generates the intermediate frequency signal of the broadcasting radio waves in the highest five stations whose electric field strength is strong and outputs them to the IF amplifier of a post-stage.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to an audio output device that outputs audio by switching between an audio input signal of broadcast radio waves and an audio input signal other than broadcast radio waves. The present invention relates to an electronic tuner that receives and selects broadcast radio waves while outputting audio based on a signal.

[Conventional technology]

Conventionally, there has been an electronic tuner of this type as shown in FIG. In the figure, the conventional electronic tuner includes a receiver l that receives and selects broadcast waves from a plurality of stations via an antenna, and controls the receiver l and the entire device based on operation input from an operation unit 8. It is equipped with a controller 6 and a PLL circuit 9 that achieves phase synchronization in the mixer of the receiver 1 based on the control of the controller 6, and is configured to control the switching operation of the function switch 2 connected to the output side of the receiver 1. The receiver 1 outputs either an audio signal of broadcast radio waves based on the receiver 1 or an audio signal other than the broadcast radio waves, for example, from a player such as a tape or CD.

Next, the operation of the conventional electronic tuner based on the above configuration will be explained.

First, when an audio output command based on an audio signal from a tape, CD, etc. is input by operating the operation unit 8, the function switching unit 2 outputs an audio signal from the tape, CD, etc. based on the control from the controller 6. function (hereinafter referred to as the first function). By this switching operation, audio from the tape, CD, etc. is input to an output device such as a speaker.

Simultaneously with the switching of the funk switching section 2, the reception and tuning operations of the receiver 1 are stopped, and the receiver 1 does not output any audio signals of broadcast waves.

Furthermore, when the function switching unit 2 switches from the first function to a function (hereinafter referred to as a second function) that outputs a broadcast radio audio signal, the receiver 1
scans all frequency bands and selects the target station as the next station.

[Problem to be solved by the invention]

Since the conventional electronic tuner is constructed as described above, it outputs audio based on the audio input signal of broadcast radio waves from the first function state in which audio output is performed based on an audio input signal other than broadcast radio waves. When switching to the second function state, there was a problem in that broadcast wave tuning had to be restarted from the beginning. In particular, in receivers mounted on mobile objects such as in-vehicle radios, the electric field strength of broadcast waves changes from moment to moment, so in order to select the broadcast waves with the best reception sensitivity, all bands must be scanned ( This problem has arisen in that a channel cannot be selected until after a SCAN operation (or a SEEK operation in the case of preset channel selection).

[Means to solve the problem]

FIG. 1 is a diagram explaining the principle of the present invention.

In the figure, the present invention is connected to the input side of a selection means that receives an input of an audio human input signal of a broadcast radio wave and an audio input signal other than the broadcast radio wave, and selects one of the audio input signals, and the above broadcast radio wave An electronic tuner that receives and selects a station includes a receiving means for receiving broadcast waves when an audio input signal other than broadcast waves is selected by the selection means, and a receiving means for receiving a broadcast radio wave, and detecting the electric field strength of the broadcast radio waves received by the receiving means. An electric field strength detection means to detect, a broadcast wave selection means to select a plurality of broadcast waves with strong electric field strengths detected by the electric field strength detection means from the top every predetermined period, and information on the plurality of selected broadcast waves is stored. and a broadcast wave information storage means for inputting a broadcast wave audio input signal corresponding to the broadcast wave information stored in the broadcast wave information storage means when the broadcast wave audio input signal is selected by the selection means. It is output to the selection means.

[Effect]

In the present invention, even when audio is output based on an audio input signal other than the broadcast radio waves, the broadcast radio waves of a plurality of stations selected by the receiving means can be used. By selecting multiple ones with strong electric field strength from among them at predetermined intervals, even when switching from the ↑ Fanokun Yong to the second function that performs audio output based on the audio signal of the broadcast radio wave, the strongest electric field is instantly detected. Broadcast radio waves with electric field strength can be left behind.

〔Example〕

Hereinafter, one embodiment of the present invention will be described based on FIGS. 2 and 3. FIG. 2 is a schematic block diagram of the electronic tuner of this embodiment, and FIG. 2 is an operation flowchart showing the operation details of this embodiment.

In each of the above figures, the electronic tuner according to the present embodiment is configured such that the broadcast radio waves received by the antenna are RF
It is input to a receiver 1 consisting of an amplifier, a mixer, an IF amplifier, and a detector, and output as an audio input signal through the receiver. It is configured to switch from an audio human input signal based on a CD or the like and output it as an audible sound.

In addition to the above configuration, the electronic tuner of this embodiment includes a field strength detection section 3 that detects the field strength of the received broadcast radio wave based on the intermediate frequency signal output from the IF amplifier of the receiver 1, and a station detection unit 4 that detects a specific station from the signal and the low frequency signal output from the detector of the receiver 1;
An upper station selection unit 5 selects the top 5 stations with the strongest electric field strength from the detected electric field strength and specific stations, stores the broadcast radio wave data of the top 5 stations in the memory 7 at predetermined intervals, and controls the operation unit 8. The configuration includes a controller 6 that reads the stored broadcast radio wave data based on a function switching command and outputs it to the PLL circuit 9 to control the entire device, and a memory 7 that stores the broadcast radio wave data based on the control of the controller 6. be.

Next, the operation of this embodiment based on the above configuration will be explained. First, when the switch of the operation unit 8 is turned on (100), the controller 6 determines whether the function is the first function or the second function. If it is determined that the input signal is to be output (1 0 1),
Start the operation of receiving broadcast radio waves as follows.

This reception operation is based on the received broadcast radio waves.
An intermediate frequency signal is output from the F amplifier, and the electric field strength is detected by the electric field strength detector 3 based on this intermediate frequency signal (
10'2). Further, a specific station is detected by a station detecting section 4 based on the detected low frequency signal outputted from the detector 1 and the intermediate frequency signal from the IF amplifier.

Furthermore, based on the above-mentioned detected electric field strength and specific station power, the upper station selection unit 5 selects the top five stations of broadcast radio waves with the strongest electric field strength (103). Broadcast radio wave data regarding the selected top five stations are stored in the memory 7 under the control of the controller 6 (1 0 4).

The controller 6 also accumulates the elapsed time starting from the end of selecting the broadcast radio wave data of the five stations, and determines whether the accumulated time has reached a predetermined time (for example, 5 minutes). (105). If it is determined that the predetermined time has elapsed, each process from (100) to (105) above is repeated again, and new broadcast wave data obtained through each process is stored in the memory 7. and rewrite the old data. On the other hand, if it is determined that the predetermined time has not been reached (105), the current broadcast wave data is stored and held in the memory 7.

Next, when the switch for switching from the first function to the second function is turned on by operating the operation unit 8, the controller 6 inputs a switching command to the function switching unit 2, and also inputs the electric field strength stored in the memory 7. Read out the broadcast signal data for the top 5 stations with the highest
Input to LL circuit 9. This PLL circuit 9 outputs a local oscillation frequency signal to the mixer of the receiver 1 based on the broadcast radio wave data. This mixer quickly generates an intermediate frequency signal of the broadcast radio waves of the top five stations with the strongest field strength based on the local oscillation frequency signal of the PLL circuit 9, and outputs it to the IF amplifier at the subsequent stage.

Further, after the intermediate frequency signal is amplified by the IF amplifier, a low frequency signal is output by detection by low frequency amplification in a wave detector. This low frequency signal is output as an audio input signal from the speaker via the function switching section 2 as an audible sound.

In the above embodiment, the station detecting section 4 is provided to detect a specific station, but the station detecting section 4 is not provided and the upper station selecting section 5 selects the upper station based on the detection result of the electric field strength detecting section 3. It is also possible to select a configuration.

Further, in the above embodiment, the upper station selection unit 5 is configured to select the top 5 stations of broadcasting waves with strong electric field strength, but it is not limited to 5 stations, but may be configured to select any one or more stations. You can also.

Furthermore, in the above practical example, multiple stations were selected from the top in the order of strength of electric field without specifying the broadcasting wave transmitting station, but RDS (Radio data system)
+tem) and configured in combination with the same. For each program (affiliated station) (PI, Pr+BralIlmeId
en[ilicaion], for each same program (AF,
LiN of Alterna+i4e Frqaen
ci+), each station broadcasting traffic information (T P, Tr
affic PiograaIlle Identif
cation) or for each program of the same genre (P T
Ys? It is also possible to select a plurality of stations according to various classifications of oBammeType.

Furthermore, the present invention can be applied to AM broadcasts, FM broadcasts, and other various broadcasts.

Further, in the above embodiment, a PLL circuit is used as the local oscillator, but the local oscillator may also be configured using a microcomputer, an LC oscillation circuit, or the like.

〔Effect of the invention〕

As explained above, in the present invention, even when audio is output based on the audio input signal other than the broadcast radio wave, which is the first function, the receiving means can select from among the broadcast radio waves of a plurality of stations selected by the receiving means. By selecting a plurality of strong electric field strengths every predetermined period, even when the first function is switched to the second function that outputs audio based on the audio input signal of broadcast radio waves, the strongest electric field strength is instantaneously achieved. This has the effect of allowing broadcast radio waves to be tuned.

[Brief explanation of the drawing]

FIG. 1 is a diagram illustrating the principle of the present invention, FIG. 2 is a schematic diagram of an electronic tuner according to an embodiment of the present invention, and FIG. 3 is an operation flowchart explaining the operation contents of an embodiment of the present invention. FIG. 4 shows a schematic configuration diagram of a conventional electronic tuner. 1...Receiver 2...Function switching unit 3...Field strength detection unit 4...Station detection unit 5...Upper station selection unit 6...Controller 7...Memory 8... Operation unit 9...PLL circuit

Claims (1)

[Scope of Claims] An audio input signal of a broadcast radio wave and an audio input signal other than the broadcast radio wave are inputted, and connected to the input side of a selection means for selecting one of the audio input signals, In an electronic tuner that receives and selects a channel, a receiving means receives the broadcast radio wave when an audio input signal other than the broadcast radio wave is selected by the selection means, and detects the electric field strength of the broadcast radio wave received by the receiving means. an electric field strength detecting means for detecting a field strength, a broadcast wave selecting means for selecting a plurality of broadcast waves having a strong electric field strength detected by the electric field strength detecting means from the top every predetermined period, and storing information on the plurality of selected broadcast waves. and a broadcast wave information storage means, which selects a broadcast wave audio input signal corresponding to the broadcast wave information stored in the broadcast wave information storage means when the broadcast wave audio input signal is selected by the selection means. An electronic tuner characterized by outputting to a means.