JP3167545B2 - Automotive audio equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an on-vehicle audio device mounted on a car or the like, and more particularly, to an apparatus for simultaneously reproducing an audio signal from a CD / cassette tape and a radio traffic information signal.

[0002]

2. Description of the Related Art As shown in FIG. 4, a conventional on-vehicle audio device is provided with a tuner 402 for receiving a radio broadcast, an audio signal such as a CD or a cassette tape input from an input terminal 401 or output from the tuner 402, An audio source selecting means 404 for selecting any of the signals input through the tuner input terminal 403; an audio amplifier 406 selected by the audio source selecting means 404 and amplifying the signal input through the audio signal output terminal 405; And a traffic information selection switch 408 which is depressed when making a selection.

In this vehicle-mounted audio apparatus, the audio source selection means 404 receives an audio signal such as a CD / cassette tape applied to an audio signal input terminal 401 and a tuner 402 applied to a tuner signal input terminal 403. The radio signal is input, and the audio source selection means 404 selects one of them and outputs it to the audio signal output terminal 405. The audio amplifier 406 amplifies the signal selected by the audio source selection means 404 and outputs the amplified signal to an amplifier output terminal 407, and the amplified signal is sent to a speaker.

When the traffic information selection switch 408 is depressed, a depression signal is sent to the audio source selection means 404 and the tuner 402, and the tuner 4 is depressed by the depression signal.
The tuning frequency of 02 is switched to a preset radio traffic information station frequency, and the audio source selecting means 404
Selects and outputs a signal input from the tuner signal input terminal 403. As a result, the broadcast signal from the radio traffic information station is amplified and reproduced by the audio amplifier 406.

[0005]

However, in the conventional in-vehicle audio apparatus, when the traffic information selection switch is depressed while selecting and listening to an audio source such as a CD or a cassette tape, the audio source selection means 404 is provided. However, since the audio source is switched to the tuner 402, the audio source is interrupted every time the radio traffic information is heard.

An object of the present invention is to solve such a conventional problem, and an object of the present invention is to provide a vehicle-mounted audio device capable of simultaneously reproducing an audio signal and a radio traffic information signal.

[0007]

Therefore SUMMARY OF THE INVENTION In the present invention, the vehicle audio apparatus for reproducing each audio signal and radio traffic information signal, the audio signal
And localization of sound image by radio traffic information signal
Localization control means for controlling the location and the spread of the sound image;
Position and audio mixing means for combining the audio signal and radio traffic information signal sound image control provided by the control unit, the audio signal and radio traffic information signals,
Different sound image localization position and sound image spread
Te, is configured so as to be able to play at the same time.

[0008]

[0009]

Therefore, when the traffic information is selected, the audio signal and the radio traffic information signal are synthesized and output by the audio mixing means, so that the reproduction of the audio signal is not interrupted.

For an audio signal before being mixed, for example, the sound source is located far away and the sound spreads, whereas for the radio traffic information signal, the sound source is located near and the sound is spread. By localizing the sound image so as to be sharp, the radio traffic information can be clearly heard even when the audio signal and the radio traffic information signal are reproduced simultaneously.

[0011]

【Example】

(First Embodiment) As shown in FIG. 1, a vehicle-mounted audio apparatus according to a first embodiment of the present invention receives a tuner 102 for receiving a radio broadcast, and an audio signal such as a CD / cassette and received by the tuner 102. An audio mixing means 105 that receives a radio broadcast signal and outputs one or both of them; an audio source selection means 104 that selects either an audio signal or a radio broadcast signal as an output signal of the audio mixing means 105; , Traffic information selection switch pressed when selecting traffic information
An audio amplifier 107 amplifies the output signal of the audio mixing means 105.

In this vehicle-mounted audio apparatus, audio mixing means 105 receives an audio signal such as a CD / cassette tape applied to an audio signal input terminal 101 and a tuner 102 applied to a tuner input terminal 103. A radio broadcast signal is input.

[0013] When the audio mixing means 105 receives the notification of the selection from the audio source selection means 104, it outputs the selected signal from the audio signal and the radio broadcast signal to the audio signal output terminal 106. The audio amplifier 107 amplifies the signal output from the audio mixing means 105 and outputs the amplified signal to an amplifier output terminal 108, and this signal is sent to a speaker.

The audio source selecting means 104 selects an audio signal, and the audio mixing means 105
When the traffic information selection switch 109 is depressed while an audio signal such as a D cassette tape is being output, the depression signal is notified to the audio mixing means 105 and the tuner 102, and the tuner 102 that has received the notification, The tuning frequency is switched to a preset transmission frequency of the radio traffic information station, and the received radio traffic information signal is output to the audio mixing means 105.

At the same time, the audio mixing means 105
Adjusts the audio signal input from the audio signal input terminal 101 and the radio traffic information signal input from the tuner signal input terminal 103 to appropriate levels, and then adds the signals. The added signal is output to the audio signal output terminal. Output to 106. The output signal is amplified by the audio amplifier 107 and sent to the speaker via the amplifier output terminal 108.

Here, the above-mentioned appropriate level is, for example, an adjustment for reducing the volume of the audio signal and increasing the volume of the radio traffic information broadcast signal. Can be played without lowering

As described above, in the vehicle audio system according to the first embodiment, both the audio signal and the radio traffic information signal can be reproduced simultaneously.

(Second Embodiment) The on-vehicle audio device of the second embodiment can appropriately set the position of a sound image in a vehicle for an audio signal and a radio signal.

As shown in FIG. 2, this apparatus localizes sound image positions between the audio signal input terminal 101 and the audio mixing means 105 and between the tuner signal input terminal 103 and the audio mixing means 105, respectively. Control means 210 is provided. Other configurations are the same as those of the first embodiment (FIG. 1).

In this on-vehicle audio apparatus, the audio signal applied to the audio signal input terminal 101 and the output of the tuner 102 applied to the tuner signal input terminal 103 are input to the localization control means 210, where they are input to the vehicle interior. Signal processing is performed so that the sound image localization is optimal at the listening position of the
Supplied to Except for the processing in the localization control means 210, the operation of this device is the same as the operation of the device of the first embodiment.

The localization control means 210 includes, for example, an anti-aliasing LPF 303 for removing aliasing distortion of left and right audio signals input from the input terminal 301 as shown in FIG.
An A / D converter 304 for converting an analog signal into a digital signal, and FIR filters 305, 306, 30 for converting an input signal into a signal having desired characteristics according to a coefficient to be multiplied.
7, 308, adders 309 and 310 for adding the filtered left and right audio signals, a D / A converter 311 for converting a digital signal into an analog signal, and smoothing the output waveform of the D / A converter 311. By appropriately selecting the coefficients of the FIR filters 305 to 308, for example, the audio signal is located far away from the sound source, the sound spreads right and left, and the radio traffic information signal is The sound image localization is set so that a sharp sound image is obtained nearby.

As described above, in the on-vehicle audio apparatus according to the second embodiment, it is possible to set so that the audio signal such as a CD / cassette and the radio traffic information can be heard from different positions with different sounds depending on the sound image localization. The listener can clearly hear the radio traffic information even though the radio traffic information is reproduced while being superimposed on the audio sound.

[0023]

As is apparent from the above description of the embodiment, the on-vehicle audio apparatus according to the present invention converts an audio signal and a radio traffic information signal into different sound image localizations.
Set, at the same time Runode can play, without interrupting the playback of the audio source, the light of the traffic information
Listen without losing clarity .

[0024]

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a vehicle-mounted audio device according to a first embodiment of the present invention;

FIG. 2 is a block diagram showing a configuration of a vehicle-mounted audio device according to a second embodiment of the present invention;

FIG. 3 is a block diagram illustrating a configuration of a localization control unit in the vehicle-mounted audio device according to the second embodiment;

FIG. 4 is a block diagram of a conventional in-vehicle audio device.

[Explanation of symbols]

 101, 401 Audio signal input terminal 102, 402 Tuner 103, 403 Tuner signal input terminal 104, 404 Audio source selection means 105 Audio mixing means 106, 405 Audio signal output terminal 107, 406 Audio amplifier 108, 407 Amplifier output terminal 109, 408 Traffic information selection switch 210 Localization control means 301, 302 Audio input terminal 303 LPF for anti-aliasing 304 A / D converter 305, 306, 307, 308 FIR filter 309, 310 Adder 311 D / A converter 312 LPF for smoothing 313, 314 Audio output terminal

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-6-140955 (JP, A) JP-A-3-3000 (JP, A) JP-A-63-136831 (JP, A) JP-A-5-139 300038 (JP, A) Japanese Utility Model Showa 60-4045 (JP, U) Japanese Utility Model Application Hei 5-65134 (JP, U) Japanese Utility Model Application Hei 4-27231 (JP, Y2) (58) Fields surveyed (Int. Cl. ⁷ , DB name) H04B 1/06 H04B 1/16

Claims (1)

(57) [Claims] 1. An in-vehicle audio device for reproducing an audio signal and a radio traffic information signal, respectively , wherein the audio signal and the radio traffic information signal are respectively
Position of sound image by sound and localization to control the spread of sound image
And control means, the localization control unit and an audio mixing means for combining the audio signal and radio traffic information signal sound image control provided by the audio signal and radio traffic information signals, expansion of different sound image localization position and the sound image, respectively But
Ri and made to have, car audio system, characterized in that to be able to play at the same time.