JPH0538000A - Automatic surround mode setting musical performance device - Google Patents

Abstract

PURPOSE: To automate the setting of the surround mode of a playing device being a digital sound source and to simplify an operation. CONSTITUTION: A micro computer chip 9 incorporating RAM 10 where information on the number of tracks and playing time, which the digital sound source have, are made to correspond to the surround modes which a listener sets in the digital sound source and ROM 18 where the algorithm of the various surround modes is programmed are arranged in a DSP control unit 17 controlling DSP 15. When the digital sound source which is previously set is reproduced, the algorithm of the surround mode is sent to DSP 15 and an operation processing is executed. Then, the surround mode is automatically set and played.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a surround mode setting method for a digital sound source playing apparatus in which a plurality of surround modes can be selected. More specifically, information on the number of tracks and playing time is read from a digital sound source and stored in advance. And, the listener selects at least one of the plurality of surround modes so as to store the digital sound source and the selected mode in a one-to-one correspondence with each other, thereby storing the digital sound source. The present invention relates to an automatic surround mode setting performance device that simplifies the operation by automatically setting and playing the selected surround mode.

[0002]

2. Description of the Related Art With the spread of digital sound sources in recent years, listeners have become more and more interested in more comfortable music reproduction.
On the other hand, audio equipment is also equipped with various functions according to the listener's intention, and is becoming more sophisticated.

A surround mode setting function is one of the functions for improving performance. This is a function that allows listeners to experience the realism of a theater hall or outdoor stadium as they wish, while they are still there.

To generate the effect of the surround mode, a digital signal processor (hereinafter referred to as DSP) is usually used.
Called. ). The DSP is composed of a semiconductor LSI that processes a digital input signal according to an algorithm programmed in a memory device in the DSP control unit.

[0005] The sound from each of the front, rear, left and right speakers is temporally shifted by the DSP, and the volume is changed, and the reverberation effect is produced by the waveform processing, and the presence of a theater hall or an outdoor stadium is produced.

Conventionally, this surround mode selection function has a digital sound source such as a compact disc (hereinafter referred to as a CD) mounted on an audio device, and a listener selects a desired surround mode on a control surface with a switch. Was configured to do.

[0007]

However, while the operation of the audio equipment is becoming more complicated as the performance of the audio equipment becomes higher, the listener desires that more comfortable music reproduction can be obtained by the simple operation. However, the above-mentioned conventional digital sound source playing device with surround mode setting function must newly set the surround mode each time the listener mounts the digital sound source on the device, and the listener must select one of a plurality of surround modes. If one of them can be selectively set, the number of surround mode selection and setting operations is increased, which conflicts with the requirement for simple operation.

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 will set the surround mode each time the digital sound source is exchanged while the vehicle is driving, and the driver's thoughts and line of sight will be directed toward the operation surface of the audio device. There was a problem that attention was easily distracted and safe driving was lacking.

The present invention has been made in view of the above circumstances, and particularly for an on-vehicle audio device that requires a simple operation during driving from the viewpoint of safe driving, a digital sound source performance in which a plurality of surround modes can be selected. In the device,
By allowing the listener to select at least one of the plurality of surround modes once, the selected surround mode will automatically be set and played when the digital sound source is played thereafter. The present invention provides an automatic surround mode setting performance device.

[0010]

In order to achieve the above object, the present invention is a digital sound source playing apparatus capable of selecting a plurality of surround modes, in which information on the number of tracks and playing time is read from a digital sound source and stored in advance. ,
The listener sets at least one of the plurality of surround modes so that the digital sound source and the set mode are stored in one-to-one correspondence with each other, and stored, so that the digital sound source is played thereafter. When
The above object is achieved by providing an automatic surround mode setting performance device characterized in that a preset surround mode is automatically set and played.

[0011]

According to the automatic surround mode setting performance device of the present invention, the information of the number of tracks and the playing time of the digital sound source written at the head of the digital sound source mounted on the device is read out and constantly stored in the memory device. This serves to distinguish it from other digital sound sources.

That is, each digital sound source has various numbers of tracks and playing times. Normally, the numbers of tracks and playing times do not match in separate digital sound sources. One-to-one correspondence with digital sound sources is possible. By setting the surround mode of the digital sound source determined by the number of tracks and the playing time, the digital sound source and the set surround mode are stored in the memory device in a one-to-one correspondence.

When a listener listens to a digital sound source,
First, the number of tracks and playing time of the mounted digital sound source are read, compared with those already stored in the memory device, and if they match, the corresponding surround mode stored and stored in the past is automatically set and played. Work like.

If the comparison does not match the one already stored in the memory device, a certain mode is automatically set until the listener sets the surround mode as a new digital sound source. To work.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of an automatic surround mode setting performance device according to 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 automatic surround mode setting performance device according to the present invention.

The automatic surround mode setting performance device 40 in this embodiment is an on-vehicle CD performance device, and is shown in FIG.
The CD changer player 1 in which CDs are mounted in multiple stages as shown in FIG. 1 and the A / D that converts analog signals from the CD changer player 1 into digital signals
A converter 5, a CD player control unit 7 for controlling the CD changer player 1, a mode set key 11 for setting a surround mode, a liquid crystal display 13 for displaying an operating state, a DSP 15 of a digital signal arithmetic processing unit, and a digital signal. A memory device 19 for temporarily storing a reproduction signal, a DSP control unit 17 for controlling the DSP 15, digital filters 21, 23 for various filtering operations, a D / A converter 25, 2 for converting a digital signal into an analog signal.
7. Further, it is composed of an electronic volume 29 for adjusting the volume and sound quality of front, rear, left and right, and power amplifiers 31, 33 for amplifying signals from the electronic volume 29 to drive the front speaker 35 and the rear speaker 37, respectively.

The CD changer player 1 is mounted on a vehicle trunk or a seat front part for mounting on a vehicle, and can store a plurality of CDs. Any one of the stored CDs can be selected. It can be played back.

The memory device 19 is an SRAM (Static Random Access Memory), which is capable of writing, erasing, and reading at all times, and temporarily stores a digitized music signal, and the DSP 15 delays and reads the music signal, thereby producing a surround effect. Has a function of issuing.

The liquid crystal display 13 is for displaying various operating states of the apparatus 40, and the set key 11 is for the listener to press C.
The D changer 1 comprises a key for designating an arbitrary one of the CDs or a playing order of a plurality of CDs and a switch for setting a surround mode.

In the DSP control unit 17, a ROM (read only memory) chip 18 in which five kinds of surround mode algorithms are written, and a CD
RAM (random access memory) 10 for storing the number of tracks, playing time, and selected surround mode
The microcomputer chip 9 containing the

The DSP 15 receives the digital input signal D
It performs arithmetic processing such as delay processing, amplitude processing, and waveform processing in accordance with a command from the SP control unit 17, and is composed of one LSI chip.

The digital filters 21, 23, A /
The D converter 5 and the D / A converters 25 and 27 are composed of general-purpose IC chips.

The electronic volume 29 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 31 and 33 are general-purpose operational amplifiers.

Reference numeral 35 denotes front left and right front speakers inside the vehicle, and 37 denotes left and right rear speakers rearward in the vehicle.

Next, the operation of the automatic surround mode setting performance device 40 according to the present invention will be described in detail with reference to FIG.

First, the CD player control unit 7 instructs the CD changer player 1 to reproduce the selected CD according to the content selected by the listener with the set key 11.

Then, according to the command, the CD changer player 1 starts playing the selected CD, and the information of the number of tracks and the playing time read from the CD is transferred to the microcomputer in the DSP control unit 17 through the CD player control unit 7. It is stored in the RAM 10 built in the chip 9 and held in the memory until the reproduction of the CD is completed.

On the other hand, while the CD is being reproduced, the set key 11
The listener sets the desired surround mode among the 5 types of surround modes. The set surround mode information is stored through the CD player control unit 7 in the RAM 10 incorporated in the microcomputer chip 9 in the DSP control unit 17 in association with the information on the number of tracks and playing time of the CD, and the surround of the CD is stored. Mode registration is completed. Both pieces of information are played back after the device 4
It is always held even after the power switch of 0 is turned off.

Next, when the listener reproduces the registered CD, first, at the start of reproduction, the information on the number of tracks and the playing time of the CD is read, and the DSP control unit 1 is read.
The surround mode corresponding to the track number and the playing time, which are sent to the microcomputer chip 9 in the RAM 7 and are compared with the information group of the registered track number and the playing time stored in the RAM 10, are matched.

The DSP control unit 17 stores the called surround mode algorithm information in the ROM 1
8 to the DSP 15 to instruct arithmetic processing. DS
P15 is the reproduction information of the CD converted into a digital signal by the A / D converter 5 and the memory 1 according to the algorithm.
The delay time, the amplitude process, the waveform process and the like are used as an input signal with the reproduction information which is temporarily stored in 9 and delayed.

After the arithmetic processing, the digital signals corresponding to the front, rear, left and right speakers inside the vehicle are respectively filtered by the digital filter 2.
After being filtered by 1, 23 and analogized by the D / A converters 25, 27, the volume and sound quality of the listener are adjusted via the electronic volume 29, amplified by the power amplifiers 31, 33, and then the front part of the vehicle interior. The left and right front speakers 35 and the left and right rear speakers 37 at the rear of the vehicle are driven.

Next, if the listener plays an unregistered CD, that is, if the number of tracks on the CD and the playing time do not match with those already stored in the memory device 10, a new recording is made. Until the listener sets and registers the surround mode as a CD, the DSP control unit 17 selects the hi-fi mode as the normal mode, and the RO
DSP from M18 to the high-fidelity mode algorithm
Send to 15.

After performing the arithmetic processing according to the algorithm, the DSP 15 drives the left and right speakers 35, 37 in the front and rear of the vehicle by the same operation as described above.

Also, the setting registration of the surround mode is not limited to one time, but by operating the set key 11, the CD player control unit 7 can display the DS.
It is possible to issue a reset registration command to the P control unit 17 and rewrite the registration information in the RAM 10.

Although the number of surround modes is five in this embodiment, the number of surround modes is not limited to this and may be three or seven, for example.

In the present embodiment, the number of speakers is four on the left and right sides in the front and rear of the vehicle, but the present invention is not limited to this. For example, two speakers are installed on the left and right sides of the center of the vehicle. It may be six. In this case, ROM1
The 8 surround mode algorithms may be programmed for the 6 speakers to perform the arithmetic processing of the DSP 15.

Next, although the present embodiment relates to a vehicle-mounted CD changer playing device, the present invention is not limited to this, and a CD player for playing one CD and a CD player control unit. It may be a car-mounted CD player playing device that integrates
Further, it is not limited to being mounted on a vehicle, but may be indoors or outdoors.

Further, the type of digital sound source is not limited to CD, but may be digital audio tape or laser disk as long as it has unique information such as the number of tracks and playing time.

[0040]

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

(1) In the automatic surround mode setting performance device of the present invention, once the listener sets the surround mode of the digital sound source to the preferred mode, it is necessary to set the surround mode again when the digital sound source is reproduced thereafter. Instead, it is automatically played back in the previously set mode, which has the excellent effect that the listener can enjoy comfortable music playback by a simple operation.

(2) In the in-vehicle digital audio device, a simple operation is indispensable from the viewpoint of safe driving. However, the simple operation has an excellent effect that comfortable music can be reproduced without reducing attention to driving. Have.

[Brief description of drawings]

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

[Explanation of symbols]

 1 CD Changer Player 5 A / D Converter 7 CD Player Control Unit 11 Set Key 13 Liquid Crystal Display 15 DSP (Digital Signal Processor) 17 DSP Control Unit 9 1 Chip Microcomputer 10 Microcomputer Built-in RAM 18 ROM (Read Only Memory) 21 Digital Filter 23 Digital Filter 25 D / A Converter 27 D / A Converter 29 Electronic Volume 31 Power Amplifier 33 Power Amplifier 35 Front Speaker 37 Rear Speaker 40 Automatic Surround Mode Setting Performance Device

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Yuichi Osawa Inventor Yuichi Osawa 180 Sakata, Oizumi-cho, Gunma-gun, F.M.S.

Claims (1)

Claim: What is claimed is: 1. A digital sound source playing apparatus capable of selecting a plurality of surround modes, in which information on the number of tracks and playing time is read out from the digital sound source and stored in advance.
In addition, the listener selects at least one of the plurality of surround modes so that the digital sound source and the selected mode are stored in one-to-one correspondence with each other, and stored. When
An automatic surround mode setting performance device characterized in that a selected surround mode is automatically set and played.