JPH0730454A - Fm news mod automatic setting device - Google Patents

Abstract

PURPOSE: To simplify an operation by automatically setting up a mode so as to automatically set up an optimum FM news sound listening state mode when the reception of FM broadcast is switched to FM news broadcast. CONSTITUTION: When a receiving wave state detector 5 for detecting an wave state specific to news broadcast included in an FM broadcast wave detects FM news broadcast, the detector 5 transmits a control signal to a DSP control unit 6, a microcomputer 7 selects an FM news mode programmed in a ROM 8 and controls a DSP 10 so as to operate an input signal in accordance with the algorithm of the selected mode, so that FM broadcast can be automatically listened in an always optimum listening state.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for setting an FM news broadcast in an optimum audio listening state in an audio device having an FM tuner.

[0002]

2. Description of the Related Art In recent years, in the field of audio, listeners have become more and more motivated to reproduce music more comfortably, and audio equipment is also equipped with various functions according to the listener's intention and has been improved in performance. There is.

A digital signal processor (hereinafter referred to as a DSP) is one that plays a role in improving the function.
There is. This is a process in which an input analog signal is once converted into a digital signal by an A / D converter, and is subjected to arithmetic processing such as delay processing, amplitude processing, and waveform processing according to an algorithm programmed in a memory device in the DSP control unit. It is composed of a semiconductor LSI.

[0004] The sound from each of the front, rear, left and right speakers is temporally shifted by the DSP, the volume is changed, and the reverberation effect is produced by the waveform processing, so that the presence of a theater hall or an outdoor stadium (the surround effect) is enhanced. Be created.

On the other hand, in the conventional audio equipment,
If the listener enjoying the surround effect on the music of FM broadcasting switches to FM news broadcasting, or if the music program changes to the news program while listening to FM broadcasting, the former surround effect can be applied. If left in the same state, the voice of the news becomes unclear and difficult to hear due to the reverberation effect of the surround.

In the past, in this case, the listener had to cancel the surround effect and adjust the news sound with an electronic volume or the like in order to bring the news sound into an optimum state.

[0007]

However, as the performance of audio equipment has become higher and higher, the operation of the equipment has become complicated, and the listener desires that more comfortable music reproduction can be obtained by the simple operation. However, in the above-mentioned conventional audio equipment, each time the music is changed to the news or the news is changed to the music, the listener has to newly set the optimum listening state, which conflicts with the request for the simple operation. Had the problem.

In particular, in a car audio device,
Complicated operation due to higher performance becomes a problem from the viewpoint of safe driving. In other words, the driver who is the listener is
When listening to the stereo music of the broadcast in surround, the setting will be changed to listen to the news more clearly each time it switches to the news broadcast, and when the news ends, it will try to return to the optimal music listening state again. However, since the driver's thoughts and line of sight are directed toward the operation surface of the audio device, the driver's attention is likely to be distracted, resulting in a lack of safe driving.

The present invention has been made in view of the above circumstances, and in particular, for an on-vehicle audio device that requires a simple operation during driving from the viewpoint of safe driving, an FM device having an FM tuner can receive an FM broadcast. At the time of switching from music broadcasting to news broadcasting, the input signal processing was performed by the digital signal processor so that the FM news mode would automatically be in the optimum news audio listening state, and then the news broadcasting returned to music broadcasting. At this time, the FM news mode automatic setting device is provided which is designed to be easily operated so as to return to the original music listening state.

[0010]

In order to achieve the above object, the present invention detects the radio wave condition peculiar to a news broadcast existing in an FM broadcast radio wave in an audio device having an FM tuner to perform FM news broadcast. It is an object of the present invention to provide the FM news mode automatic setting device in which the input signal processing is performed by the digital signal processor so that the optimum audio listening state is automatically obtained as the FM news mode.

[0011]

In the FM news mode automatic setting device of the present invention, by selecting a predetermined key in advance, when the radio wave condition peculiar to the news broadcast contained in the FM radio wave is detected during FM broadcast reception, the received radio wave condition is obtained. The detector is DSP
It serves to transmit a control signal for switching to the FM news mode to the control unit.

In the above case, the DSP control unit serves to control the DSP to operate in the FM news mode, which is the optimum FM news audio listening condition.

When the radio wave condition of the FM news broadcast is not detected, the reception radio wave condition detector transmits the information to the DSP control unit, and the DSP control unit performs the arithmetic processing in the DSP processing mode set previously. Work to do.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An FM news mode automatic setting device according to an embodiment of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of an FM news mode automatic setting device according to the present invention.

The FM news mode automatic setting device 40 in the present embodiment, as shown in FIG. 1, is an FM electronic tuner 1 capable of receiving FM broadcasting, and an A / A for converting an analog signal from the FM electronic tuner 1 into a digital signal. D
Converter 3, reception radio wave condition detector 5 for detecting reception condition of FM radio wave, DSP 10 of digital signal arithmetic processing device, memory device 11 for temporarily storing reproduced signal converted into digital signal, DSP control unit 6 for controlling DSP 10. , And a liquid crystal display 13 for displaying the operating state, and a digital filter 1 for various filtering operations.
7. A D / A converter 19 for converting a digital signal into an analog signal, an electronic volume 21 for adjusting the volume and sound quality of front, rear, left and right, a front speaker 27 and a rear speaker 29 by amplifying signals from the electronic volume 21. The power amplifiers 23 and 25 are respectively driven.

The FM electronic tuner 1 selects an FM broadcast and is similar to the FM electronic tuner of a normal audio device.

The received radio wave condition detector 5 detects a radio wave condition peculiar to FM news broadcasting and sends a control signal. For the detection method in this detector, see 2
One embodiment will be described later.

The memory device 11 is an SRAM (Static Random Access Memory), which can always write, erase, and read, and temporarily stores a digitized music signal, and the DSP 10 delays and reads the music signal for surround effect. Has the function of issuing

The liquid crystal display 13 displays various operating states of the apparatus 40, and the set key 15 is composed of a switch for selecting whether or not the listener automatically switches to the FM news mode. To be done.

In the DSP control unit 6, a ROM (read-only memory) chip 8 in which several kinds of surround mode algorithms and FM news mode algorithms are written, and a RAM (random access) for storing a selected DSP processing mode. The microcomputer chip 7 including the memory 9 is included.

The DSP 10 outputs a digital input signal to D
Delay processing according to the instruction of the SP control unit 6,
It performs arithmetic processing such as amplitude processing and waveform processing, and is composed of one LSI chip.

The digital filter 17, the A / D converter 3 and the D / A converter 19 are composed of general-purpose IC chips.

The electronic volume 21 is an LSI chip having a function of adjusting the volume of each speaker and the balance between high and low tones, and the power amplifiers 23 and 25 are general-purpose operational amplifiers.

Reference numerals 27 and 29 denote front, rear, left and right speakers. At this time, the number of speakers varies depending on the system configuration of the audio device, but 27 and 28 in the figure are general terms for the speakers corresponding to the number of channels.

Next, a first embodiment of the FM news mode automatic setting apparatus according to the present invention will be described in detail with reference to the block diagram of FIG.

In FM broadcasting, all music broadcasting is usually stereo broadcasting, and a pilot signal for demodulation on the receiving side is always broadcast as a control signal. On the other hand, news broadcasts are usually monaural broadcasts and are not accompanied by pilot signals. Therefore, the reception radio wave condition detection circuit 5 is set to FM.
As a circuit for detecting the presence or absence of a 19 kHz pilot subcarrier (pilot signal) that is a control signal for stereo broadcasting, it has the same configuration as the circuit of the stereo indicator function (the function for displaying monaural broadcasting or stereo broadcasting) in conventional equipment. As a result, it is possible to detect whether or not the FM news broadcast.

In this embodiment, the listener first sets the set key 1.
If the FM news mode automatic setting state is set in step 5, if the FM stereo broadcast is listened to in a certain DSP processing mode and the mode is switched to monaural news broadcast, the reception radio wave condition detection circuit 5 confirms that there is no pilot signal. DSP
It is transmitted to the microcomputer 7 of the control unit 6. According to this, the microcomputer 7 selects the FM news mode algorithm programmed in the ROM 8 and D
The SP 10 commands the arithmetic processing in the mode.

Next, the DSP 10 follows the instruction, and according to the FM news mode algorithm, the A / D converter 5
The FM broadcast signal converted into a digital signal and the FM broadcast signal of the digital signal which is temporarily stored in the memory 11 and delayed is used as an input signal to perform arithmetic processing such as delay processing, amplitude processing, and waveform processing.

At this time, the FM news mode is a mode for creating an optimum news voice listening state. That is, in the case of a vehicle audio device, this is a mode in which the voice band is extracted so that the driver can hear it most clearly at the position, and the frequency characteristic and time axis are adjusted to the driver.

After the arithmetic processing, the digital signals corresponding to the speakers of each channel are filtered by the digital filter 17 and analogized by the D / A converter 19,
The volume and sound quality of the listener are adjusted via the electronic volume 21, amplified by the power amplifiers 23 and 25, and the speakers 27 and 29 of the respective channels are driven.

Next, when the monaural FM news broadcasting is switched to FM stereo broadcasting again, the reception radio wave condition detection circuit notifies the microcomputer 7 of the DSP control unit 6 that the pilot signal is present, and the microcomputer 7
Selects the DSP processing mode for the previous FM stereo broadcast stored in the built-in RAM 9 and sends the algorithm of this mode from the ROM 8 to the DSP 10.

The DSP 10 carries out arithmetic processing according to the algorithm, and then drives the speakers 27 and 29 of each channel by the same operation as described above.

In the above embodiment, the set key 15
Needless to say, the FM news mode automatic setting state can be canceled by. In this case, regardless of whether the FM broadcast is monaural or stereo, the DSP 10 always performs arithmetic processing in the DSP processing mode preset by the listener.

Next, the second embodiment will be described.

In the second embodiment, the received radio wave condition detection circuit 5 is a music broadcast or a talk broadcast (broadcast of only human voice such as news) depending on the spectrum (dispersion of frequency components) of the signal demodulated after reception. ) Is detected by the method of determining whether or not.

That is, for example, the spectrum of a music broadcast has a characteristic that it is widely distributed over the entire audible frequency band, whereas the spectrum of a talk broadcast has a characteristic that it is distributed over a narrow band. This is based on the fact that it is possible to detect whether or not it is a talk broadcast by comparing the intensity with a reference value.

The operation of other components is the same as that of the first embodiment in the block diagram of FIG.

According to the above method, the reception radio wave condition detection circuit 5
If it is detected that it is a talk broadcast, a control signal for mode setting is transmitted to the microcomputer 7 of the DSP control unit 6, and the same processing as in the first embodiment is performed thereafter.

In the second embodiment, not only news broadcast but also general talk broadcast other than music is automatically set to FM news mode in the sense that human voice can be clearly heard. It will be.

Further, in the above-mentioned two embodiments, in the configuration of the DSP control unit 6, the ROM in which the algorithms of various DSP processing modes (surround mode and FM news mode) are programmed is one chip, but it is not limited to this. It is not something, for example, the microcomputer 7
It may be one that is built in.

On the contrary, R built in the microcomputer 7
The AM 9 is not limited to this, and may be, for example, a RAM incorporated in the DSP.

Further, although the above-mentioned two embodiments are mainly intended for the on-vehicle audio equipment which is particularly required to be easily operated, the present invention is not limited to this, and it is applicable to general households. It may be an audio device for use.

Further, in the block diagrams (FIG. 1) of the two embodiments, only the FM electronic tuner for receiving the FM broadcast is shown as the sound source, but of course the system of the audio equipment is not limited to this. Alternatively, a CD player, cassette deck, etc. may be added to the system.

[0045]

Since the FM news mode automatic setting device according to the present invention is configured as described above, it has the following effects.

(1) In the FM news mode automatic setting apparatus according to the present invention, if the key operation is performed once so as to be in the FM news mode automatic setting state, when the FM broadcasting mode is switched to the news broadcasting after that, the listener is Since there is no need to switch the mode setting to the optimum news voice listening state and the mode is automatically switched to the optimum news voice listening state, the listener has the excellent effect of always enjoying a comfortable FM broadcast.

(2) In a car audio device, a simple operation is indispensable from the viewpoint of safe driving, but the automatic mode switching enables comfortable FM broadcasting reception without reducing attention to driving, which contributes to safe driving. It has an excellent effect.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of an FM news mode automatic setting device according to the present invention.

[Explanation of symbols]

 1 FM electronic tuner 3 A / D converter 5 Reception electric wave condition detector 6 DSP control unit 7 1 chip microcomputer 8 ROM 9 Microcomputer built-in RAM 10 DSP (digital signal processor) 11 Memory 13 Display 15 Set key 17 Digital filter 19 D / A converter 21 Electronic volume 23 Power amplifier 25 Power amplifier 27 Speaker 29 Speaker 40 FM news mode automatic setting device

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yuichi Osawa 180 Sakata, Oizumi-machi, Gunma Prefecture Oizumi-cho, FMS Audio Cendirien Bahad (72) Inventor Kiyoshi Hosoya Gunma Prefecture Ogura County Univ. 180 Izumicho, Sakata, F.M.S.Audio Sendiriyan Bahd

Claims (1)

[Claims] 1. An audio device having an FM tuner detects a radio wave condition peculiar to a news broadcast existing in an FM broadcast radio wave, and in the case of FM news broadcast, automatically detects an optimum audio listening state as an FM news mode. An FM news mode automatic setting device characterized in that an input signal processing is performed by a digital signal processor so that