JPH06311578A - Speaker polarity deciding method in audio system - Google Patents

Abstract

PURPOSE:To obtain a speaker polarity deciding method for a superior audio system capable of detecting erroneous connection between an amplifier and a speaker and obtaining the polarity of an audio signal supplied to the speaker arbitrarily. CONSTITUTION:A reference audio signal instead of the audio signal from a main body device 1 is supplied in the audio system in which prescribed signal processing is applied to the audio signal from the main body device and the signal with designated polarity is supplied to the speaker 4. A speaker audio signal obtained by collecting voice generated from the speaker corresponding to the reference audio signal with a microphone 8 is compared with the reference audio signal. The correctness/incorrectness of the polarity of the speaker audio signal is decided based on a comparison result, and the polarity of the audio signal to be supplied to the speaker corresponding to a prescribed operation can be set arbitrarily.

Description

Detailed Description of the Invention

[0001]

[0001]

[0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a speaker polarity determining method in an audio device for supplying a speaker with an audio signal carrying information such as music pieces obtained from a predetermined sound source.

[0003]

[0002]

[0004]

2. Description of the Related Art A recording medium such as a tape or a compact disc (CD) on which a music piece is recorded, or an audio signal obtained from another sound source is amplified and other predetermined signal processing is applied to a speaker with a specified polarity. Providing audio devices is widely known. In such a device, when connecting the amplifier and the speaker, + (positive electrode),-(negative electrode)
Must be connected correctly with the specified polarity. If this polarity is incorrect at the time of connection, the phase of the audio output from the speaker will be inverted, and the sound quality will be significantly reduced. Therefore, it was noted in the instruction manual etc. that the amplifier and the speaker are carefully connected.

[0005]

[0003]

[0006]

However, in the above-mentioned conventional audio apparatus, when connecting the amplifier and the speaker, there is a risk of damaging the apparatus unless the audio apparatus is powered off. Since the sound from the speaker is heard to check whether the connection is correct or not, there is a problem that it is difficult to confirm when there are many speakers.

[0007]

Further, it may be difficult to easily find such confirmation work depending on the type of voice from the speaker and the musical sensitivity of the listener. Furthermore, in the case of an in-vehicle audio device, the connection between the amplifier and the speaker itself is complicated, and even if an error in connection is found, it takes time to correct it.

[0008]

Furthermore, some users may intentionally connect in opposite polarities depending on the genre of music and enjoy their abnormal musicality, but it is complicated to change the connection each time. It was extremely difficult in practice.

[0009]

The present invention solves such a conventional problem, and is an excellent audio device capable of easily detecting an error in connection between an amplifier and a speaker and setting the polarity of an audio signal supplied to the speaker arbitrarily. An object of the present invention is to provide a speaker polarity determination method in.

[0010]

[0007]

[0011]

In order to achieve the above-mentioned conventional object, an audio apparatus for subjecting a voice signal from a main body device to a speaker with a specified polarity by subjecting the audio signal to a predetermined signal processing. The reference sound signal is supplied instead of the sound signal, and the sound generated from the speaker is collected by the microphone according to the reference sound signal to determine whether the polarity of the speaker sound signal is correct, The polarity of the audio signal supplied to the speaker is arbitrarily set according to the operation.

[0012]

[0008]

[0013]

Therefore, according to the speaker polarity determining method in the audio device of the present invention, the reference voice signal is supplied to the speaker after the connection of the speaker is completed, and the polarity of the voice from the speaker is automatically determined. Even if there are many connections, it is easy to make correct connections and the polarity of the audio signal supplied to the speaker can be set freely, so even users who connect to the opposite polarity intentionally and enjoy their abnormal musicality The complexity of connection changes can be eliminated.

[0014]

[0009]

[0015]

Embodiments of the present invention will be described below in detail with reference to the drawings.

[0016]

FIG. 1 is a block diagram showing the configuration of a system to which a speaker polarity determining method in an audio device of the present invention is applied. In FIG. 1, among the connection lines that connect the blocks, the solid line indicates a signal line for transmitting an audio signal, and the dotted line indicates a control line for transmitting a control signal. The audio device of this embodiment is a vehicle-mounted audio device mounted on a vehicle. 1 is a center unit as a main body device, which receives a command from the operation unit,
The master microcomputer installed in the unit centrally controls the slave microcomputer of each source unit such as a tuner unit, tape deck, CD deck, and CD autochanger as a sound source via a computer line, and the source according to the operation. The audio signal of is selected and output.

[0017]

Reference numeral 2 denotes a DSP section (DS
P unit), which performs acoustic correction on the audio signal output from the center unit 1 to create a sound field rich in realism. A main amplifier 3 amplifies and outputs an analog audio signal output from the DSP unit 2. Four
Is a speaker, which receives a voice signal from the main amplifier 3 and generates a sound.

[0018]

An audio analyzer 5 is composed of an analyzer 6 and a personal computer 7. PC 7
The control line between the DSP unit 2 and the DSP unit 2 is composed of RS232C, and the signal line from the analyzer 6 to the DSP unit 2 is composed of an optical cable. Further, 8 is a microphone, which inputs an audio signal obtained by collecting the sound generated from the speaker 4 to the analyzer 6. 1a is the center unit 1
Is a remote control for remote control.

[0019]

The audio analyzer 5 can supply the DSP unit 2 with a reference audio signal in place of the audio signal from the center unit 1. A pulse signal is used as the reference audio signal in this embodiment. FIG. 2 shows a pulse signal output from the audio analyzer 5 (referred to as an “input pulse signal”) and an audio signal obtained by collecting audio generated by the speaker 4 in response to the pulse signal with the microphone 8 It is a figure which shows the phase relationship with a "pulse signal."

[0020]

In FIG. 2, when the connection between the amplifier 3 and the speaker 4 has the correct polarity, the phases of the input pulse signal and the output pulse signal are positive, and when the connection has the opposite polarity, the input pulse signal is And the output pulse signal have opposite phases. Since this phase relationship is displayed on the display unit of the personal computer 7, the user can easily recognize the correctness of the connection polarity. Further, by inverting the polarity of the audio signal supplied to the speaker 4 by the key operation of the personal computer 7, the polarity of the audio signal supplied to the speaker can be freely set without actually changing the connection.

[0021]

FIG. 3 is a flowchart of speaker polarity determination. The speaker polarity determination method and the polarity setting method will be described with reference to FIG.

[0022]

First, after connecting the audio analyzer to the DSP section (step S1), a speaker is selected on the audio analyzer side (step S2). When the pulse signal which is the reference voice signal is output from the audio analyzer (step S3), the pulse signal passes through the DSP unit, and the selected speaker outputs a sound corresponding to the pulse signal (step S4). Sound generated by the pulse signal is collected by a microphone and input to the audio analyzer (step S5).

[0023]

The audio analyzer displays the input pulse signal (step S6) and analyzes the pulse signal (step S7). That is, the phases of the input pulse signal and the output pulse signal are analyzed. As a result of this analysis, it is determined whether or not the phase is a positive phase (step S8). When it is in the positive phase, it is displayed that the speaker polarity is the positive phase (step S9). In this case, in addition to the display indicating that the connection is normal, a beep sound only once or a message "normal" by voice synthesis may be transmitted.

[0024]

On the other hand, if the result of determination is that it is not in positive phase, it is displayed that the speaker polarity is in reverse phase (step S10). Further, in this case, an error message indicating that the connection is opposite is displayed (step S1).
1). In this case as well, in addition to the error display, a warning message "Error" due to a periodic beep sound or voice synthesis may be transmitted.

[0025]

Thereafter, it is judged whether or not the polarity reversal operation has been performed by a predetermined key operation of the personal computer (step S1).
2) If the polarity inversion operation is performed, a control signal for inverting the polarity of the audio signal supplied to the speaker is sent to the DSP unit (step S13). After that, it is determined whether or not the ending operation is performed (step S14), and when the ending operation is not performed, the process proceeds to step S2, and the polarity determination routine of the next selected speaker is executed.

[0026]

In this way, the polarities of all the speakers are sequentially determined to determine whether the connection polarities are correct or false, and the polarity of the audio signal to be input to each speaker is arbitrarily set by a predetermined key operation. Virtually any connection error can be corrected without actually changing the connection.

[0027]

In the above embodiments, the car audio system has been described, but it goes without saying that the present invention can be applied to a general home audio system.
A condenser microphone or the like is built in such a home audio device, and after connecting a speaker, a test mode is set, and the correctness of the connection is diagnosed by the speaker polarity determination method similar to that of the above embodiment. Then, if the connection is incorrect, a system for issuing a warning by display or voice is constructed.

[0028]

According to such a configuration, even a user who is unfamiliar with audio technology can perform polarity of speaker connection without error.

[0029]

[0023]

[0030]

As is apparent from the above embodiments, according to the speaker polarity determining method in the audio device of the present invention, the speaker sound signal generated from the speaker and the reference sound according to the reference sound signal supplied to the speaker. The polarity of the speaker audio signal is determined by comparing it with the signal, and the polarity of the audio signal supplied to the speaker is arbitrarily set according to a predetermined operation, so that the correctness of the connection can be established even if many speakers are connected. And the polarity of the audio signal supplied to the speaker can be set freely, so that the connection error can be virtually corrected without actually changing the connection. Furthermore, there is an effect that the user can consciously connect to the opposite polarity to eliminate the complexity of connection change even for a user who enjoys an abnormal musicality.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a system to which a speaker polarity determination method in an audio device of the present invention is applied.

FIG. 2 is a diagram showing a phase relationship between a reference audio signal supplied to the speaker in FIG. 1 and an audio signal obtained from the speaker.

FIG. 3 is a flowchart showing a speaker polarity determination method in the audio device of the present invention.

[Explanation of symbols]

 1 Center unit (main unit) 2 DSP section 4 Speaker 8 Microphone 5 Audio analyzer

[Procedure amendment]

[Submission date] March 22, 1994

[Procedure Amendment 1]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 1

[Correction method] Change

[Correction content]

[Figure 1]

Claims (2)

[Claims] 1. An audio device that performs predetermined signal processing on an audio signal from a main body device and supplies the audio signal to a speaker with a specified polarity, and supplies a reference audio signal in place of the audio signal from the main body device, The polarity of the audio signal supplied to the speaker according to a predetermined operation is determined by determining whether the polarity of the speaker audio signal obtained by collecting the sound generated from the speaker with a microphone according to the reference audio signal is correct. A speaker polarity determination method for an audio device, characterized in that 2. The speaker polarity determination method for an audio device according to claim 1, wherein a warning is generated when the determined polarity is different from the designated polarity.