JP2009200902A - Signal processing apparatus, and signal processing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To freely change a headphone to be connected in a noise canceling system. <P>SOLUTION: In a headphone device, identification information is stored beforehand in accordance with physical structure patterns such as presence/absence of electrode, presence/absence of irregularities, and the like. At the side of a signal processing apparatus, a structure pattern detecting means is provided for detecting electrical signals corresponding to the physical structure patterns. Corresponding relation information is stored which represents a corresponding relation between the identification information and signal processing characteristics of a signal processing means corresponding to a headphone device specified by the identification information. On the basis of the electrical signal detected by the structure pattern detecting means, the identification information is acquired and on the basis of the corresponding relation information, a signal processing characteristic corresponding to the acquired identification information is set to the signal processing means. Thus, information representing the type of headphone device can be automatically acquired, and the signal processing characteristic corresponding to the connected headphone device can be set on the basis of the acquired identification information. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a signal processing device configured to be connectable to a headphone device that is worn on a user's ear and performs sound reproduction, and a signal processing method.

Japanese Patent Laid-Open No. 3-214892 Japanese Patent Laid-Open No. 3-96199

  A so-called noise canceling system for headphone devices that actively cancels external noise that is heard when playing sound of content such as music with a headphone device is known and put into practical use. ing. As such a noise canceling system, two systems, a feedback system and a feedforward system, are broadly known.

For example, Patent Document 1 discloses an audio signal obtained by inverting the phase of noise (noise) inside an acoustic tube collected by a microphone unit provided in the vicinity of an earphone (headphone) unit in an acoustic tube attached to a user's ear. Is generated and output from the earphone unit as sound, thereby reducing the external noise, that is, the configuration of the noise canceling system corresponding to the feedback method is described.
Further, in Patent Document 2, as a basic configuration, a configuration in which a sound signal obtained by collecting a microphone with a microphone attached to the outer casing of the headphone device is given a characteristic by a predetermined transfer function and output from the headphone device. That is, the configuration of a noise canceling system corresponding to the feedforward method is described.

Regardless of which of the feedforward method and the feedback method is employed, the filter characteristic set for noise canceling is, for example, that the sound from an external noise source reaches the user's ear position (noise cancellation point). Is set so that noise is canceled at the user's ear position based on various transfer functions such as the spatial transfer function up to and the characteristics of the microphone amplifier / headphone amplifier.
At this time, the spatial transfer function greatly depends on the structure of the acoustic tube (housing) of the headphone device, and therefore, the filter characteristic for noise canceling is one type having the same structure. This is set assuming a headphone device. In other words, in the noise canceling system, the filter characteristics should be set in a one-to-one relationship with the headphone device.

At present, a noise canceling filter is configured by an analog circuit. For this reason, in the current noise canceling system, the filter (signal processing device) and the headphone device can only be used in a one-to-one combination assumed in advance, and for example, does not have a noise canceling function. As is done in the sound reproduction system, the headphone device cannot be changed to an arbitrary one.
For confirmation, when the filter is configured with an analog circuit, a plurality of filter circuits having different filter characteristics are provided for changing the filter characteristics, and the filter characteristics are changed by switching them. Will do. However, such a configuration is unrealistic in terms of circuit mounting area, and as a result, at present, the signal processing device and the headphone device can be used only in a supposed one-to-one combination. .

  In response to the current situation as described above, there is a strong demand for changing the headphones to another model having another structure in the noise canceling system. For example, the inner type headphone device may be changed to an ear covering type headphone device. Alternatively, it may be assumed that a change is made between the FF system headphone and the FB system headphone.

  As a configuration for variably setting filter characteristics, the present applicant has previously proposed a configuration in which a noise canceling filter is realized by a digital circuit. That is, the noise canceling filter is realized by a digital filter such as an FIR (Finite Impulse Response) filter. By adopting such a noise canceling system using a digital filter, the filter characteristics can be changed by changing the filter configuration and the filter coefficient, and the configuration is simpler than that of an analog circuit. It can be.

Here, when the filter characteristics are variably set according to the headphones to be used, it is naturally necessary to identify the type (type) of headphones actually used.
In such identification, for example, it is conceivable to acquire other information on the headphones to be used based on a user operation. However, when performing identification based on user input information, the user is inevitably burdened with an operation, resulting in a system lacking convenience.
In addition, when performing identification based on the user's operation input in this way, there is a possibility that a headphone different from the headphone that is actually used is selected due to misunderstanding of the user, in which case appropriate noise is selected. There arises a problem that the canceling effect cannot be obtained.

In view of the above problems, the present invention is configured as a signal processing apparatus as follows.
That is, the signal processing device of the present invention is a signal processing device that can be connected to a headphone device in which identification information is stored by a physical structure pattern, and when the headphone device is connected, Structure pattern detection means configured to detect an electrical signal corresponding to the structure pattern is provided.
In addition, an identification information acquisition unit that acquires the identification information based on the electrical signal detected by the structure pattern detection unit is provided.
Further, signal processing means for performing signal processing so as to give a required signal characteristic to a signal supplied to the headphone device is provided.
Correspondence relation information representing correspondence relation between identification information stored in the headphone device and signal processing characteristics to be set in the signal processing means when the headphone device specified by the identification information is connected. A stored storage means is provided.
Furthermore, a control means is provided for performing control so that a signal processing characteristic corresponding to the identification information acquired by the identification information acquisition means is set in the signal processing means based on the correspondence information.

According to the above configuration, the identification information stored in the headphone device is automatically acquired by the signal processing device in response to the connection of the headphone device. That is, it is possible to automatically acquire information representing the distinction of the headphone device regardless of the user operation.
And based on the identification information acquired in this way, the signal processing characteristic of the signal processing means is set (changed) to a characteristic corresponding to the identification information. As a result, appropriate signal processing characteristics according to the type of headphone device to be used can be automatically set on the device side.

According to the present invention, it is possible to automatically acquire information (identification information) indicating the distinction of the headphone device regardless of a user operation. Then, based on the identification information acquired in this way, the signal processing characteristics of the signal processing means can be set (changed) to characteristics determined corresponding to the identification information (connected headphone device).
That is, according to the present invention, it is possible to automatically set appropriate signal processing characteristics according to the type of headphone device to be used on the device side, thereby realizing an excellent system that does not impose an operation burden on the user. Is planned. At the same time, it is possible to effectively prevent the occurrence of a situation in which an incorrect signal processing characteristic is set due to a user's operation input error or the like and proper sound reproduction cannot be performed.

  Further, when the present invention is applied to a noise canceling system, it is possible to realize an excellent noise canceling system in which the headphone device can be freely changed.

Hereinafter, the best mode for carrying out the present invention (hereinafter referred to as an embodiment) will be described.
In the embodiment, a noise canceling system is taken as an example of a sound reproduction system configured to include a signal processing device and a headphone device. Therefore, in the following, first, the basic concept of the noise canceling system will be described prior to describing the configuration of the system as the present embodiment.

<Basic concept of noise canceling system>

As a basic system of the noise canceling system, a system in which servo control is performed by a feedback (FeedBack: FB) system and a feedforward (FeedForward: FF) system are respectively known. First, the FB method will be described with reference to FIG.

FIG. 1A schematically shows a model example of a noise canceling system based on the FB method on the right ear (R channel in two-channel stereo with L (left) and R (right)) of a headphone wearer (user). Is shown.
As the structure on the R channel side of the headphone device here, first, in the housing portion 201 corresponding to the right ear, a driver 202 is provided at a position corresponding to the right ear of the user 500 wearing the headphone device. . The driver 202 is synonymous with a so-called speaker having a diaphragm, and is driven (driven) by an amplified output of an audio signal so as to emit sound into space.

In addition, as the FB method, the microphone 203 is provided at a position in the housing portion 201 that is close to the right ear of the user 500. Depending on the microphone 203 provided in this way, the sound output from the driver 202 and the sound that enters the housing part 201 from the external noise source 301 and reaches the right ear, that is, the right ear can be heard. In-housing noise 302, which is an external audio signal, is collected. Note that the noise 302 in the housing is generated because the noise sound source 301 leaks as a sound pressure from a gap such as an ear pad of the housing, or the headphone device casing vibrates due to the sound pressure of the noise sound source 301. It can be mentioned that this is transmitted into the housing part.
Then, in order to cancel (attenuate or reduce) the in-housing noise 302 such as a signal having a reverse characteristic with respect to the audio signal component of the external audio from the audio signal obtained by collecting the sound with the microphone 203. The signal (cancellation audio signal) is generated, and this signal is fed back so as to be synthesized with the sound signal (audio sound source) of the necessary sound for driving the driver 202. As a result, at the noise cancellation point 400 set at a position corresponding to the right ear in the housing portion 201, the external sound is canceled by synthesizing the output sound from the driver 201 and the component of the external sound. A sound is obtained, and this sound is heard by the user's right ear. By providing such a configuration also on the L channel (left ear) side, a noise canceling system as a headphone device corresponding to normal L, R2 channel stereo can be obtained.

  The block diagram in FIG. 1B shows a basic model configuration example of the noise canceling system based on the FB method. FIG. 1B shows a configuration corresponding only to the R channel (right ear) side as in FIG. 1A, and the L channel (left). A similar system configuration can be provided for the (ear) side. Further, the block shown in this figure indicates one specific transfer function corresponding to a specific circuit part, circuit system, etc. in the system of the noise canceling system by the FB method, and is referred to as a transfer function block here. To. The character shown in each transfer function block represents the transfer function of the transfer function block, and each time a voice signal (or voice) passes through the transfer function block, the transfer function shown there Will be given.

  First, the sound collected by the microphone 203 provided in the housing unit 201 is a transfer function block corresponding to the microphone 203 and a microphone amplifier that amplifies the electric signal obtained by the microphone 203 and outputs a sound signal. It is obtained as an audio signal via 101 (transfer function M). The audio signal that has passed through the transfer function block 101 is input to the synthesizer 103 via the transfer function block 102 (transfer function −β) corresponding to the FB (FeedBack) filter circuit. The FB filter circuit is a filter circuit in which characteristics for generating the above-described cancellation audio signal are set from the audio signal obtained by collecting the sound with the microphone 203, and the transfer function thereof is expressed as -β. It is what.

In addition, the audio signal S of the audio sound source that is the content such as music is assumed to be equalized by an equalizer here, and a synthesizer is connected via a transfer function block 107 (transfer function E) corresponding to the equalizer. 13 is input.
In the FB method, the sound signal S is equalized in this way. In the FB method, a noise-collecting microphone 203 is provided in the housing portion 201, and not only the noise sound but also the output sound from the driver 202 is collected. It comes from that. That is, since the microphone 203 also collects the component of the audio signal S in this way, the transfer function −β is given to the audio signal S in the FB method. There is a risk of sound quality degradation. Therefore, in order to suppress deterioration in sound quality due to the transfer function -β, the required signal characteristics are given to the audio signal S by equalizing.

  The synthesizer 103 synthesizes the above two signals by addition. The synthesized audio signal is amplified by the power amplifier and output to the driver 202 as a drive signal, so that the driver 202 outputs the audio signal. That is, the sound signal from the synthesizer 103 passes through the transfer function block 104 (transfer function A) corresponding to the power amplifier, and further passes through the transfer function block 105 (transfer function D) corresponding to the driver 202 as sound. Released into the space. Note that the transfer function D of the driver 202 is determined by the structure of the driver 202, for example.

  Then, the sound output from the driver 202 passes through the transfer function block 106 (transfer function H) corresponding to the spatial path (spatial transfer function) from the driver 202 to the noise cancel point 400. And is synthesized with the noise 302 in the housing in that space. As the sound pressure P of the output sound that reaches the right ear, for example, from the noise cancellation point 400, the sound of the noise sound source 301 that enters from the outside of the housing portion 201 is canceled.

この[式１]において、ハウジング内ノイズ３０２であるＮに着目すると、Ｎは、１ ／（１＋ＡＤＨＭβ）で表される係数により減衰されることがわかる。 Here, in the model of the noise canceling system shown in FIG. 1B, the sound pressure P of the output sound is N in the noise 302 in the housing and S in the sound signal of the audio sound source. Thus, using the transfer function “M, −β, E, A, D, H” shown in each transfer function block, it is expressed as the following [Equation 1].

In this [Equation 1], when attention is paid to N which is the noise 302 in the housing, it is understood that N is attenuated by a coefficient represented by 1 / (1 + ADHMβ).

However, in order for the system of [Equation 1] to operate stably without oscillating in the noise reduction target frequency band, the following [Equation 2] must be satisfied.

As a general matter, the absolute value of the product of each transfer function in the noise canceling system by the FB method is

1 << | ADHMβ |

In combination with Nyquist's stability discrimination in classical control theory, [Equation 2] can be interpreted as follows.
Here, in the system of the noise canceling system shown in FIG. 1B, a system represented by (−ADHMβ) obtained by cutting a loop portion related to N, which is the noise 302 in the housing, is considered. . This system is called “open loop” here. As an example, if the transfer function block 101 corresponding to the microphone and the microphone amplifier and the transfer function block 102 corresponding to the FB filter circuit are to be disconnected, the above open loop can be formed.

The above open loop has the characteristics shown by the Bode diagram of FIG. 2, for example. In this Bode diagram, the horizontal axis represents frequency, and the vertical axis represents gain in the lower half and phase in the upper half.
When this open loop is targeted, the following two conditions must be satisfied in order to satisfy [Equation 2] based on Nyquist stability determination.
Condition 1: Phase 0 deg. When passing through the (0 degree) point, the gain must be less than 0 dB.
Condition 2: When the gain is 0 dB or more, the phase is 0 deg. Do not include the point.

When the above two conditions 1 and 2 are not satisfied, positive feedback is applied to the loop, causing oscillation (howling). In FIG. 2, phase margins Pa and Pb corresponding to the above condition 1 and gain margins Ga and Gb corresponding to the condition 2 are shown. If these margins are small, the possibility of oscillation increases due to various individual differences of the user who uses the headphone device to which the noise canceling system is applied, and variations in the state when the headphone device is worn.
For example, in FIG. 2, the phase 0 deg. The gain when passing through the point is smaller than 0 dB, and gain margins Ga and Gb are obtained accordingly. However, for example, if phase 0 deg. The gain when passing through the point is 0 dB or more and the gain margins Ga and Gb are eliminated, or the phase is 0 deg. Although the gain when passing through this point is less than 0 dB, when the gain margins Ga and Gb are close to 0 dB and the gain margins Ga and Gb become small, oscillation occurs or the possibility of oscillation increases.
Similarly, in FIG. 2, when the gain is 0 dB or more, the phase is 0 deg. The phase margins Pa and Pb are obtained. However, for example, when the gain is 0 dB or more, the phase 0 deg. The point has been passed. Alternatively, the phase 0 deg. When the phase margins Pa and Pb become small and the phase margins become small, oscillation occurs or the possibility of oscillation increases.

Next, in the configuration of the FB type noise canceling system shown in FIG. 1B, in addition to the above-described external sound (noise) canceling (reducing) function, necessary sound (necessary sound) is output by the headphone device. A case of reproduction output will be described.
Here, as a necessary sound, for example, an audio signal S of an audio source as content such as music is shown.
Note that the audio signal S may be other than the musical or similar content. For example, when the noise canceling system is applied to a hearing aid or the like, a microphone provided outside the housing for collecting the necessary sound around the microphone (different from the microphone 203 provided in the noise cancellation system) The sound signal obtained by collecting the sound. In addition, when applied to what is called a so-called headset, it becomes an audio signal such as a speech of the other party received by communication such as telephone communication. That is, the audio signal S corresponds to general audio that needs to be reproduced and output according to the use of the headphone device.

なお、この伝達特性Ｅは、周波数軸でみた場合に、上記オープンループに対してほぼ逆特性（１＋オープンループ特性）となっている。そして、この[式３]により示される伝達関数Ｅの式を、[式１]に代入すると、図１（ｂ）に示されるノイズキャンセリングシステムのモデルにおける出力音の音圧Ｐについては、次の[式４]のようにして表すことができる。

[式４]におけるＡＤＨＳの項において示される伝達関数Ａ、Ｄ、Ｈのうち、伝達関数Ａはパワーアンプに対応し、伝達関数Ｄはドライバ２０２に対応し、伝達関数Ｈはドライバ２０２からノイズキャンセル点４００までの経路の空間伝達関数に対応するので、ハウジング部２０１内のマイクロフォン２０３の位置が耳に対して近接した位置にあるとすれば、音声信号Ｓについては、ノイズキャンセル機能を有さないようにした通常のヘッドフォンと同等の特性が得られることがわかる。 First, in [Formula 1], attention is paid to the audio signal S of the audio source. Then, it is assumed that the transfer function E corresponding to the equalizer is set to have a characteristic represented by the following [Equation 3].

The transfer characteristic E is almost opposite to the open loop (1 + open loop characteristic) when viewed on the frequency axis. Then, when the expression of the transfer function E expressed by [Expression 3] is substituted into [Expression 1], the sound pressure P of the output sound in the model of the noise canceling system shown in FIG. [Equation 4].

Of the transfer functions A, D, and H shown in the ADHS term in [Equation 4], the transfer function A corresponds to the power amplifier, the transfer function D corresponds to the driver 202, and the transfer function H is noise cancelled from the driver 202. Since it corresponds to the spatial transfer function of the path to the point 400, if the position of the microphone 203 in the housing portion 201 is close to the ear, the audio signal S does not have a noise canceling function. It turns out that the characteristic equivalent to the normal headphones made like this is obtained.

Next, a noise canceling system using the FF method will be described.
FIG. 3A shows a configuration on the side corresponding to the R channel as in FIG. 1A as a model example of the noise canceling system using the FF method.
In the FF method, the microphone 203 is provided outside the housing unit 201 so that sound that is supposed to arrive from the noise sound source 301 can be collected. Then, the external sound collected by the microphone 203, that is, the sound that is assumed to have arrived from the noise sound source 301 is collected to obtain a sound signal, and an appropriate filtering process is performed on the sound signal to cancel the audio signal. To be generated. Then, the canceling audio signal is synthesized with the necessary sound signal. That is, the canceling audio signal that electrically simulates the acoustic characteristics from the position of the microphone 203 to the position of the driver 202 is synthesized with the sound signal of the necessary sound.
The sound signal obtained by synthesizing the canceling audio signal and the necessary sound signal is output from the driver 202 in this way, and the sound obtained at the noise canceling point 400 is output from the noise sound source 301 to the housing portion 201. You can hear the sound that has entered inside is canceled.

FIG. 3B shows a configuration on the side corresponding to one channel (R channel) as a basic model configuration example of the noise canceling system by the FF method.
First, the sound collected by the microphone 203 provided outside the housing part 201 is obtained as an audio signal through the transfer function block 101 having the transfer function M corresponding to the microphone 203 and the microphone amplifier.
Next, the audio signal that has passed through the transfer function block 101 is input to the synthesizer 103 via the transfer function block 102 (transfer function −α) corresponding to an FF (FeedForward) filter circuit. The FF filter circuit 102 is a filter circuit in which a characteristic for generating the above-described cancellation audio signal is set from the audio signal obtained by collecting the sound with the microphone 203, and its transfer function is represented as -α. It is what.

The audio signal S of the audio source here is directly input to the synthesizer 103.
The audio signal synthesized by the synthesizer 103 is amplified by a power amplifier and output to the driver 202 as a drive signal, so that the audio signal is output from the driver 202. That is, also in this case, the audio signal from the synthesizer 103 passes through the transfer function block 104 (transfer function A) corresponding to the power amplifier, and further passes through the transfer function block 105 (transfer function D) corresponding to the driver 202. It is emitted into the space as sound.
The sound output by the driver 202 reaches the noise cancellation point 400 via the transfer function block 106 (transfer function H) corresponding to the spatial path (spatial transfer function) from the driver 202 to the noise cancellation point 400. In this case, the noise is combined with the noise 302 in the housing.

In addition, a path from the noise source 301 to the noise cancellation point 400 until the sound emitted from the noise source 301 enters the housing portion 201 and reaches the noise cancellation point 400, as shown as the transfer function block 110. Is given a transfer function (spatial transfer function F). On the other hand, the microphone 203 collects sound that is supposed to arrive from the noise sound source 301 that is external sound, and at this time, the sound (noise) emitted from the noise sound source 301 is picked up. Before reaching, a transfer function (spatial transfer function G) corresponding to the path from the noise source 301 to the microphone 203 is given, as shown as the transfer function block 111. As the FF filter circuit corresponding to the transfer function block 102, the transfer function −α is set in consideration of the above-described spatial transfer functions F and G.
Thereby, as the sound pressure P of the output sound that reaches the right ear from the noise cancellation point 400, for example, the sound of the noise sound source 301 entering from the outside of the housing portion 201 is canceled.

また、理想的には、ノイズ音源３０１からキャンセルポイント４００までの経路の伝達関数Ｆは、次の[式６]のようにして表すことができる。

次に、[式６]を[式５]に代入すると、右辺の第１項と第２項とが相殺されることとなる。この結果から、出力音の音圧Ｐは、以下の[式７]のようにして表すことができる。

In the model of the noise canceling system based on the FF method shown in FIG. In addition, the transfer function “M, −α, E, A, D, H” shown in each transfer function block is used to be expressed by the following [Expression 5].

Ideally, the transfer function F of the path from the noise source 301 to the cancellation point 400 can be expressed as the following [Equation 6].

Next, substituting [Expression 6] into [Expression 5] cancels out the first and second terms on the right side. From this result, the sound pressure P of the output sound can be expressed as [Equation 7] below.

In this way, it is indicated that the sound that is supposed to arrive from the noise sound source 301 is canceled and only the sound signal of the audio sound source is obtained as sound. That is, theoretically, the user's right ear can hear a noise-cancelled voice. However, in reality, it is very difficult to construct a complete FF filter circuit that can provide a transfer function that fully satisfies [Equation 6]. In addition, there are relatively large individual differences in the shape of the ears of a person and the manner in which the headphone device is worn, and the change in the relationship between the position where noise occurs and the position of the microphone is particularly affected by noise in the mid-high frequency band. It is known to affect the reduction effect. For this reason, with regard to the mid-high range, active noise reduction processing is refrained, and passive sound insulation mainly depending on the structure of the housing of the headphone device is often performed.
For confirmation, [Expression 6] means that the transfer function of the path from the noise source 301 to the ear is imitated by an electric circuit including the transfer function -α.

Further, in the FF type noise canceling system shown in FIG. 3A, since the microphone 203 is provided outside the housing, the cancellation point 400 is the same as that of the FB type noise canceling system shown in FIG. Differently, it can be arbitrarily set in the housing part 201 so as to correspond to the ear position of the listener. However, the transfer function −α is usually fixed, and is determined for some target characteristic at the design stage. On the other hand, the ear shape and the like vary depending on the listener. For this reason, there may be a phenomenon that a sufficient noise canceling effect cannot be obtained or a noise component is added in a non-reverse phase to generate an abnormal sound.
For this reason, the FF method is generally considered to have a low possibility of oscillation and high stability, but it is difficult to obtain a sufficient noise attenuation amount (cancellation amount). On the other hand, in the FB method, a large amount of noise attenuation can be expected, but attention should be paid to the stability of the system. Thus, the FB method and the FF method have their characteristics.

<Sound reproduction system of embodiment>
[Configuration of signal processor]

FIG. 4 is a block diagram showing an internal configuration of the audio player 1 as an embodiment of the signal processing apparatus of the present invention.
The audio player 1 is configured to be compatible with various types of headphone devices as headphones 20 described later. Here, the type of the headphone device to which the audio player 1 of this example corresponds is shown in FIG. 5 below.

As shown in FIG. 5, the audio player 1 of this example includes (1) a headphone device of an inner ear type and an FF system type (on the outside of the microphone), and (2) an ear cover type and an FB system type. It is possible to support a headphone device (on the inside of the microphone), (3) a headphone device of an ear-mounted type and compatible with the FF method, and (4) a headband device of a neckband type and compatible with the FB method.
In this case, an ID for identifying the type of the headphone device is determined in advance for the headphone device that can be handled by the audio player 1, and the ID of the headphone device of type (1) as shown in FIG. : 0, ID: 1 is assigned to the headphone device of type (2), ID: 2 is assigned to the headphone device of type (3), and ID: 3 is assigned to the headphone device of type (4). Is given.

Returning to FIG.
In FIG. 1, the audio player 1 includes a storage unit 2. The storage unit 2 is used for storing various data including audio data.
As a specific configuration, for example, data may be written (recorded) / read to / from a solid-state memory such as a flash memory, or may be configured by an HDD (Hard Disk Drive), for example.
Also, not a built-in recording medium, but a portable recording medium, for example, a memory card incorporating a solid-state memory, an optical disk such as a CD (Compact Disc) or a DVD (Digital Versatile Disc), a magneto-optical disk, a hologram memory, or the like. It can also be configured as a drive device corresponding to the above.
Of course, both a built-in type memory such as a solid-state memory and an HDD, and a drive device for a portable recording medium may be mounted.
The storage unit 2 writes / reads audio data and other various data based on the control of the system controller 2.

Here, it is assumed that the storage unit 2 stores audio data in a state of being compressed and encoded by a predetermined audio compression encoding method. The compressed audio data read by the storage unit 2 is supplied to the reproduction processing unit 3. The reproduction processing unit 3 performs predetermined reproduction processing (decoding processing) such as expansion processing on the supplied compressed audio data based on the control of the system controller 10.
The audio data reproduced by the reproduction processor 3 is supplied to a DSP (Digital Signal Processor) 4.

The DSP 4 realizes the operation as each functional block shown in the figure by executing digital signal processing based on a program (not shown) stored in the memory 9 in the figure, for example.
Specifically, the DSP 4 performs an equalizing process on the audio data supplied from the reproduction processing unit 3 as a functional operation shown as an equalizer (EQ) 4b in the drawing. For example, the equalizer 4b can be realized by an FIR (Finite Impulse Response) filter or the like.
Further, as a functional operation shown as an NC (noise canceling) filter 4a in the drawing, sound collection detected by a microphone MIC provided in a headphone device 20 described later and input via a microphone amplifier 7 → A / D converter 8 is performed. A signal characteristic for noise canceling is given to the signal (sound pickup data). The NC filter 4a can also be constituted by, for example, an FIR filter.
Further, as the functional operation shown as the adder 4c in the figure, the audio data processed by the equalizer 4b and the sound collection data processed by the NC filter 4a are added. Data obtained by the addition processing as the adder 4c is referred to as addition data. The added data is obtained by adding the collected sound data provided with the noise canceling characteristics by the NC filter 4a. Therefore, the sound output (sound reproduction) based on the added data is performed by the headphones 20 connected to the audio player 1 so that the user wearing the headphones 20 perceives the noise component as canceled. it can.

  In the case of the present embodiment, the DSP 4 also performs processing for variably setting the filter characteristics of the NC filter based on the identification information instructed from the system controller 10 as described later. A functional block for performing a process for setting filter characteristics is not shown.

Further, the equalizer 4b in the DSP 4 functions as a filter (equalizer 107 in FIG. 1) for giving a characteristic for suppressing deterioration of sound quality to audio data when the headphones 20 corresponding to the FB system are connected. To be.
According to the above description, equalization for audio data is not essential in the case of the FF method, but when the headphones 20 corresponding to the FF method are connected, the equalizer 4b may be simply required equalization, for example. What is necessary is just to think that it functions as what performs a process.

  The addition data obtained by the DSP 4 as described above is converted into an analog signal by the D / A converter 5 and then amplified by the power amplifier 6 and supplied to the audio output terminal Tp-A.

  Further, the audio player 1 is provided with a microphone input terminal Tp-M for inputting a sound collection signal from a microphone MIC provided in the headphone device 20. The collected sound signal input via the microphone input terminal Tp-M is amplified by the microphone amplifier 7, converted to digital data by the D / A converter 8, and supplied to the DSP 4.

Here, as will be described in detail later with reference to FIG. 7, the audio player 1 actually handles the Lch (channel) and Rch 2ch audio signals. Therefore, in reality, two audio output terminals Tp-A and two microphone input terminals Tp-M, one for Lch and one for Rch, are provided.
Correspondingly, two NC filters 4a, equalizers 4b, and adders 4c in the DSP 4 are provided for each channel, and a D / A converter 5 and a power amplifier 6 are also provided for each channel. Two each will be provided. Furthermore, two microphones 7 and A / D converters 8 for each channel are provided.

The system controller 10 is configured by a microcomputer including a ROM (Read Only Memory), a RAM (Random Access Memory), a CPU (Central Processing Unit), and the like, and is stored in a storage unit such as the ROM or the memory 9, for example. The audio player 1 is entirely controlled by performing various control processes and calculations based on the program.
For example, data write / read control for the storage unit 2 described above is performed. Further, the storage unit 2 and the reproduction processing unit 3 are controlled to perform reproduction start / stop control of audio data.

Further, the system controller 10 determines whether or not a plug unit 20A (described later) of the headphone 20 is connected to a jack unit 1A (described later) of the audio player 1 based on an output from the illustrated plug connection presence / absence detecting unit 11. A process of determining (determining) is also performed.
Here, the connection presence / absence detection unit 11 is turned on, for example, by the tip of the plug unit 20A in response to the plug unit 20A of the headphone device 20 being inserted into or removed from the jack unit 1A formed on the audio player 1 side. It is a mechanical switch provided so as to be turned off. The connection presence / absence detection unit 11 is turned on in response to the plug unit 20A being inserted into the jack unit 1A (that is, connected), and the plug unit 20A is disconnected (connection is released). In response, an OFF signal is output. The system controller 10 determines whether or not the headphone device 20 is connected based on the ON / OFF signal from the connection presence / absence detection unit 11.

In particular, in the case of the present embodiment, the system controller 10 detects the structure pattern configured to obtain an electrical signal according to the physical structure pattern given to the headphones 20 for storing the ID information described above. Connected to the unit 12.
The system controller 10 receives a detection signal from the structure pattern detection unit 12 and executes a process for acquiring the ID, which will be described later.

Here, the memory 9 that can be read by the system controller 10 stores ID-filter characteristic correspondence information 9a.
As shown in FIG. 6, the ID-filter characteristic correspondence information 9a includes ID information provided for each type of headphone 20 that can be supported by the audio player 1 as shown in FIG. When the headphone 20 of the type specified by the ID is connected, the information is associated with the information of the filter characteristics determined to be set by the NC filter 4a.
As shown in FIG. 6, filter characteristic information as type 0 is associated with ID: 0. Similarly, filter characteristic information as type 1 is associated with ID: 1, type 2 is associated with ID: 2, and type 3 is associated with ID: 3.
For confirmation, the filter characteristics are determined by, for example, the configuration (number of stages, etc.) of the FIR filter as the NC filter 4a and the filter coefficient. As the filter characteristic information, parameter information about these filter configurations and filter coefficients is stored.

Returning to FIG. 4, the external communication interface 13 is connected to the system controller 10. The external communication interface 13 is a communication interface unit configured to perform data communication with an external device according to a required data communication method such as a USB (Universal Serial Bus) method, and is based on an instruction from the system controller 10. Then, data communication is performed with an external device (for example, an information processing apparatus such as a personal computer) connected via the illustrated data communication terminal Td.
The system controller 10 causes the storage unit 2 and the memory 9 to record the transfer data from the external device obtained through the external communication interface 13. Thereby, audio data stored in an external personal computer or the like is recorded in the storage unit 2 or the like, or data such as an upload program for the audio player 1 downloaded from the network by the personal computer is stored in the memory 9 or the like. It is possible to record.

A display unit 14 is connected to the system controller 10. The display unit 14 is a display device such as a liquid crystal display or an organic EL display, for example, and displays necessary information in accordance with an instruction from the system controller 10.

[Internal configuration of headphone device]

FIG. 7 is a block diagram showing the internal configuration of the headphones 20.
In FIG. 7, in order to clarify the correspondence between the terminals T formed on the audio player 1 side and the headphone 20 side, the internal configuration of the part corresponding mainly to the jack portion 1A in the audio player 1 is also shown. It shows.
It should be noted that the internal configuration of the headphone 20 and the audio player 1 of Example 5 to be described later is slightly different from that shown in FIG. This will be described later with reference to FIG.

  In FIG. 7, the headphone 20 includes an Lch driver DRV-L, an Rch driver DRV-R, an Lch microphone MIC-L, and an Rch microphone MIC-R. Further, as terminals, an Lch audio input terminal Th-AL, an Rch audio input terminal Th-AR, an Lch microphone output terminal Th-ML, and an Rch microphone output terminal Th-MR are provided.

The Lch driver DRV-L is provided so as to be inserted between the Lch audio input terminal Th-AL and the ground terminal Th-GND. The Rch driver DRV-R is provided so as to be inserted between the Rch audio input terminal Th-AR and the ground terminal Th-GND.
The Lch microphone MIC-L is provided so as to be inserted between the Lch microphone output terminal Th-ML and the ground terminal Th-GND, and the Rch microphone MIC-R is connected to the Rch microphone output terminal Th-MR and the ground. It is provided so as to be inserted between the terminal Th-GND.
The ground terminal Th-GND is a common ground terminal for the Lch microphone output, the Rch microphone output, the Lch audio input, and the Rch audio input.

Here, the arrangement relationship among the Lch driver DRV-L, the Rch driver DRV-R, the Lch microphone MIC-L, and the Rch microphone MIC-R included in the headphones 20 is as shown in FIG.
8A is a diagram schematically showing the structure of the headphone 20 when the headphone device is compatible with the FF system, and FIG. 8B is the headphone device 20 when the headphone device is compatible with the FB method.
As shown in these drawings, the headphone 20 includes an Lch housing portion 20L and an Rch housing portion 20R. In both the FF method and the FB method, the Lch driver DRV-L is provided in the Lch housing portion 20L, and the Rch driver DRV-R is provided in the Rch housing portion 20R.

  In the case of the FF method of FIG. 8A, the Lch microphone MIC-L is provided outward in the Lch housing portion 20L. That is, it is provided so as to collect sound generated in the outside of the housing portion 20L. Similarly, the Rch microphone MIC-R is provided outward in the Rch housing portion 20R.

  On the other hand, in the FB system of FIG. 8B, the Lch microphone MIC-L is provided inward in the Lch housing portion 20L. That is, it is provided so as to collect sound within the housing portion 20L, specifically, sound heard by the listener's right ear. Similarly, the Rch microphone MIC-R is provided inward at the Rch housing portion 20R.

Returning to FIG. 7, on the audio player 1 side, the Lch microphone MIC-L and the Rch microphone MIC are obtained through the Lch microphone output terminal Th-ML and the Rch microphone output terminal Th-MR on the headphone 20 side, respectively. An Lch microphone input terminal Tp-ML and an Rch microphone input terminal Tp-MR for inputting a sound pickup signal by -R are provided.
The Lch microphone input terminal Tp-ML is connected to an Lch microphone amplifier 7-L via a capacitor CL. Similarly, the Rch microphone input terminal Tp-MR is connected to the Rch microphone amplifier 7-R via a capacitor CR.
In this case, the Lch microphone input line connected to the Lch microphone input terminal Tp-ML and the Rch microphone input line connected to the Rch microphone input terminal Tp-MR are given a microphone bias voltage Vbias at a predetermined level. It has been.

  On the audio player 1 side, a ground terminal Tp-GND connected to the ground terminal Th-GND on the headphone 20 side is provided. The ground terminal Tp-GND is grounded.

  On the audio player 1 side, an Lch audio output terminal Tp-AL connected to the Lch power amplifier 6-L and an Rch audio output terminal Tp-AL connected to the Rch power amplifier 6-R are provided. . By connecting the Lch audio output terminal Tp-AL and the Lch audio input terminal Th-AL on the headphone 20 side, the Lch driver DRV-L is driven according to the output signal of the power amplifier 6-L. Further, the Rch audio output terminal Tp-AR and the Rch audio input terminal Th-AR on the headphone 20 side are connected, so that the Rch driver DRV-R is driven according to the output signal of the power amplifier 6-R. The

In FIG. 7, the plug connection presence / absence detecting unit 11 described in FIG. 4 is also shown. The plug connection presence / absence detecting unit 11 is configured to include a mechanical switch 11a as shown in the figure. One contact of the mechanical switch 11 a is grounded, and the other contact is connected to the system controller 10. The connection line to the system controller 10 is given a bias voltage at a predetermined level. When the mechanical switch 13a is turned on, that is, when the contacts are in a conductive state, the input to the system controller 10 is L (Low). Become. Further, when the mechanical switch 11a is turned off, that is, when each of the contacts is in a non-conductive state, the input to the system controller 10 becomes H (High). The system controller 10 can determine the presence / absence of plug connection according to the H / L of the input signal (detection signal) from the plug connection presence / absence detection unit 11.

[Configuration for headphone identification]

Here, the sound reproduction system according to the present embodiment is intended to obtain an appropriate noise canceling effect corresponding to each of a plurality of types of headphones 20 on the audio player 1 side.
As described above, in order to obtain an appropriate noise canceling effect, a predetermined filter characteristic for each type of headphones 20 connected to the audio player 1 is set according to the type of headphones 20 connected. Therefore, it is necessary to variably set the NC filter 4a. When the filter characteristics are variably set according to the headphones used in this way, it is natural that it is necessary to identify which type of headphones 20 actually used corresponds to.

For such identification, for example, it is conceivable that other information on the headphones 20 to be used is acquired based on a user operation. However, when performing identification based on user input information, an operation burden is inevitably imposed on the user. It becomes a strong system and it becomes a system that lacks convenience.
In addition, when performing identification based on the user's operation input in this way, there is a possibility that a headphone 20 different from the headphone 20 that is actually used is selected due to misunderstanding of the user. This causes a problem that it becomes impossible to obtain a noise canceling effect.

Therefore, in the present embodiment, ID information (ID: 0 to ID: 3 shown in FIG. 5) indicating the type of the headphone 20 is stored in a physical structure pattern, and the audio player 1 is stored. On the side, a detection unit (structure pattern detection unit 12) for detecting the difference between the structural patterns is provided, and the ID information is acquired based on the detection result of the detection unit. That is, by using such a method, the type of the headphones 20 can be automatically identified on the device side.
Hereinafter, a configuration example for realizing the ID identification method as such an embodiment will be described.

[Example 1]

First, Example 1 will be described with reference to FIGS.
In the first embodiment, an ID is stored and read according to the presence or absence of an electrode at a predetermined position on the headphone 20 side. Example 1 can be specifically divided into Example 1-1 and Example 1-2. First, FIG. 9 shows a configuration as Example 1-1.

  9A is a perspective view showing the structure of the jack portion 1A formed on the audio player 1 side and the structure of the plug portion 1A formed on the headphone 20 side, and FIG. These are the figures typically shown about the internal wiring state with respect to each electrode shown by Fig.9 (a).

9A, first, the plug unit 20A on the headphone 20 side has the Lch audio input terminal Th-AL, the Rch audio input terminal Th-AR, the Lch microphone output terminal Th-ML, and the Rch microphone output terminal described above. Th-MR and ground terminal Th-GND are provided according to the arrangement relationship shown in the figure.
At this time, the Lch audio input terminal Th-AL, the Rch audio input terminal Th-AR, the Lch microphone output terminal Th-ML, and the Rch microphone output terminal Th-MR are coaxially arranged in independent ring shapes. On the other hand, the ground terminal Th-GND is provided not to be coaxial with the terminals Th but to protrude from the portion where the coaxial terminals Th are disposed.

Here, the jack portion 1A on one audio player 1 side is formed with a positioning portion X for positioning by fitting the ground terminal Th-GND (protrusion portion). That is, since the positioning portion X is formed, the jack portion 1A and the plug portion 20A are connected in a predetermined positional relationship.
For convenience of illustration, the Lch audio output terminal Tp-AL, the Rch audio output terminal Tp-AR, the Lch microphone input terminal Tp-ML, the Rch microphone input terminal Tp-MR, and the ground terminal Tp- on the jack 1A side are shown here. Although illustration of GND is omitted, these terminals Tp are connected to the corresponding terminals Th provided on the plug part 20A side in a one-to-one relationship when the plug part 20A is connected. Is formed.

In the case of this example, on the plug portion 20A side, an electrode formation position P is preset as a position where each electrode Eh for storing ID information is to be formed.
On the other hand, on the jack portion 1A side, each electrode Ep is provided at a position where it comes into contact with each electrode forming position P when the plug portion 20A is connected.
Here, in the case of this example, the ID information is stored according to the presence or absence of the electrode Eh at each of the three electrode formation positions P on the plug portion 20A side. As shown in the drawing, these three electrode formation positions P set in the plug portion 20A are defined as a first electrode formation position P1, a second electrode formation position P2, and a third electrode formation position P3.
Further, when the plug part 20A is connected, the electrode Ep on the jack part 1A side provided so as to be in contact with the first electrode formation position P1, the second electrode formation position P2, and the third electrode formation position P3 on a one-to-one basis. Are referred to as a first electrode Ep1, a second electrode Ep2, and a third electrode Ep3, respectively.

  In the example of this figure, the case where the electrode Eh is formed at all of the first electrode formation position P1, the second electrode formation position P2, and the third electrode formation position P3 on the plug portion 20A side is illustrated. Regarding the electrode Eh formed at the first electrode formation position P1, the electrode Eh formed at the first electrode Eh1, the second electrode formation position P2 is the second electrode Eh2, and the electrode Eh formed at the third electrode formation position P3 is The third electrode is Eh3.

In Example 1-1, the wiring of the electrodes Eh and Ep formed as described above is as shown in FIG. 9B, so that the ID information can be read on the audio player 1 side. .
As shown in the figure, on the headphone 20 side, each of the first electrode Eh1, the second electrode Eh2, and the third electrode Eh3 is connected to a ground line connected to the ground terminal Th-GND. That is, all the electrodes Eh formed at the electrode formation position P are connected to the ground line.
On the other hand, on the audio player 1 side, the electrode Ep1, the electrode Ep2, and the electrode Ep3 are connected to the system controller 10 through lines to which a bias voltage of a predetermined level is applied.
In the figure, the notation “2.8V” represents a voltage level that is digitally treated as H (High).

With such a configuration, when the jack portion 1A and the plug portion 20A are connected and the electrode Eh is formed at the electrode formation position P, the line of the corresponding electrode Ep on the jack portion 1A side becomes L, and vice versa. When the electrode Eh is not formed at the electrode forming position P, the line of the corresponding electrode Ep on the jack portion 1A side is set to H.
In this way, on the audio player 1 side, the structure pattern detection unit 12 for obtaining an electrical signal for detecting the presence or absence of the electrode Eh is formed for each electrode formation position P on the plug unit 20A side. The system controller 10 can acquire the ID information stored on the headphone 20 side based on the physical structure pattern as the presence / absence of the electrode Eh based on the electrical signal obtained by the structure pattern detection unit 12.

  Here, for confirmation, if the ID is stored based on the presence / absence of the electrode Eh at the three electrode formation positions P as described above, there are eight combinations of each position and the presence / absence of the electrode Eh. Therefore, it is possible to identify up to eight types of headphones 20.

Next, the configuration of Example 1-2 will be described with reference to FIG.
As can be understood with reference to FIG. 10, in the example 1-2, the electrode Eh on the plug portion 20A side in the previous example 1-1 was connected to the ground line, and an Lch microphone was used. The Lch microphone signal line connected to the output terminal Th-ML or the Rch microphone signal line connected to the Rch microphone output terminal Th-MR is connected.
In Example 1-2, in response to connecting the electrode Eh on the plug portion 20A side to the microphone signal line as described above, on the audio player 1 side, each electrode Ep is connected to the system via a grounded line. The controller 10 is connected.

Here, as can be understood with reference to FIG. 7, the microphone signal voltage is supplied with the microphone bias voltage Vbias from the audio player 1 side. Therefore, according to the configuration shown in FIG. 10, when the electrode portion E is formed at the electrode formation position P when the jack portion 1A and the plug portion 20A are connected, the corresponding electrode Ep on the jack portion 1A side The line is H. Conversely, when the electrode Eh is not formed at the electrode formation position P, the line of the corresponding electrode Ep on the jack portion 1A side is set to L.
In this way, the structural pattern detection unit 12 that obtains an electrical signal for detecting the presence / absence of the electrode Eh for each electrode formation position P on the plug unit 20A side is formed also in the embodiment 1-2 shown in FIG. Then, the system controller 10 can acquire the ID information stored on the headphone 20 side based on the electrical signal obtained by the structure pattern detection unit 12.

The flowchart of FIG. 11 shows a processing operation for realizing the change setting of the filter characteristic of the NC filter 4a based on the ID information acquired by the system controller 10 in this way.
In FIG. 11, the processing operation shown as the system controller in the figure is executed by the system controller 10 based on a program stored in, for example, the ROM described above. Further, the processing operation shown as DSP is executed by the DSP 4 based on a program stored in the memory 9.

  First, on the system controller 10 side, in step S101 in the figure, a process of waiting until a plug is connected is executed. As described above, the presence / absence of connection of the plug unit 20A can be detected based on the ON / OFF signal from the plug connection presence / absence detection unit 11 described with reference to FIGS.

  In response to the plug being connected, an ID reading process is executed in step S102. That is, based on the result of determining whether the electric signal level on the line for each terminal Ep is H / L, the information on the ID stored based on the presence or absence of the electrode Eh on the headphone 20 side is acquired.

In a subsequent step S103, a determination process is performed as to whether or not there is an ID that matches the correspondence information. That is, it is determined whether or not there is an ID that matches the ID read in step S102 in the ID-filter characteristic correspondence information 9a stored in the memory 9.
If a negative result is obtained in step S103 that there is no ID that matches the correspondence information, the process advances to step S105 to execute an unsupported notification process. Here, as a case where a negative result is obtained in step S <b> 103, a case where the connected headphone 20 is an unsupported model at that time, for example, a newly released headphone 20 is assumed. In response to this, as the unsupported notification process in step S105, the display unit 14 shown in FIG. 4 displays information indicating that the connected headphones 20 are unsupported. Specific information contents to be displayed include information indicating that the connected headphones 20 are not supported, and an external information processing apparatus such as a personal computer that can be connected to a network. Information for instructing download of ID information / filter characteristic information to be added to the correspondence information 9a may be displayed.
When the processing of step S105 is executed, the processing operation on the system controller 10 side shown in this figure is finished.

  On the other hand, if a positive result is obtained in step S103 that there is an ID that matches the correspondence information, the process proceeds to step S104 to instruct the DSP of the ID. That is, the DSP 4 is instructed with the ID information acquired in the process of step S102.

The DSP 4 side waits for an ID instruction from the system controller 10 side in step S201 in the figure. If there is an ID instruction, in step S202, processing for setting the NC filter characteristic is executed based on the filter characteristic information associated with the instructed ID. That is, in the ID-filter characteristic correspondence information 9a, a process of setting the filter characteristic of the NC filter 4a is executed based on the filter characteristic information associated with the ID information that matches the instructed ID.
When the process of step S202 is executed, the processing operation on the DSP 4 side shown in this figure is finished.

[Example 2]

Subsequently, Example 2 will be described.
In the following description, parts that are the same as those already described so far are assigned the same reference numerals and description thereof is omitted.

FIG. 12A is a perspective view showing the structure of the jack portion 1A and the plug portion 1A, and FIG. 12B is a diagram for explaining the configuration of the second embodiment. It is the figure which showed typically about the internal wiring state with respect to each electrode in the side.
In the second embodiment, ID information is stored depending on the presence or absence of a conductive plate at a predetermined position of the plug portion 20A and is read.

Specifically, in the plug portion 20A in this case, as shown in FIG. 12A, the first conductive plate forming position P11, the second conductive plate forming position P12, and the third conductive plate forming position P13 are previously set at predetermined positions. Is set, and ID information is stored depending on the presence or absence of the conductive plate at each of the formation positions P11, P12, and P13. In the example of this figure, the case where a conductive plate is formed at all of the first conductive plate formation position P11, the second conductive plate formation position P12, and the third conductive plate formation position P13 is shown. As shown, the conductive plates formed at the first conductive plate formation position P11, the second conductive plate formation position P12, and the third conductive plate formation position P13 are the first conductive plate Eh11, the second conductive plate Eh12, 3 conductive plate Eh13.
In this case, there is no internal wiring for each of the conductive plates Eh11, Eh12, and Eh13, and these are formed by attaching a metal plate or the like, for example.

  A pair of [electrode Ep11a, electrode Ep11b] provided to contact the first conductive plate formation position P11 when the plug portion 20A is connected to the jack portion 1A on the audio player 1 side, and a second conductive plate A set of [Electrode Ep12a, Electrode Ep12b] provided so as to be in contact with the formation position P12 and a set of [Electrode Ep13a, Electrode Ep13b] provided so as to be in contact with the third conductive plate formation position P13 are provided.

  As shown in FIG. 12B, among the [Electrode Ep11a, Electrode Ep11b], [Electrode Ep12a, Electrode Ep12b], and [Electrode Ep13a, Electrode Ep13b], the electrode Ep11b, the electrode Ep12b, and the electrode Ep13b are respectively. Grounded to earth. On the other hand, the electrode Ep11a, the electrode Ep12a, and the electrode Ep13a are connected to the system controller 10 through lines to which a bias voltage of a predetermined level is applied.

With such a configuration, the structure pattern detection unit 12 for detecting the presence / absence of the conductive plate Eh at each conductive plate forming position P on the headphone 20 side by an electric signal is formed.
In this case, when the conductive plate Eh is formed at the conductive plate formation position P on the plug portion 20A side, the line connected to the corresponding terminal Ep on the jack portion 1A side is L, and when the conductive plate Eh is not formed, it corresponds. The line connected to the terminal Ep to be operated becomes H. The system controller 10 obtains ID information stored based on the presence or absence of the conductive plate Eh on the headphone 20 side by determining the H / L of the electric signal obtained from the line connected to each terminal Ep. Can do.

Here, also in the second embodiment, a process for changing and setting the filter characteristic of the NC filter 4a according to the ID information acquired in this way is performed. Since it becomes the same as what was demonstrated in (4), the new description is abbreviate | omitted.

[Example 3]

In the third embodiment, ID information is stored depending on the presence or absence of a protrusion (convex portion) at a predetermined position on the plug portion 20A side, and a mechanical switch for detecting the presence or absence of the protrusion portion on the jack portion 1A side is correspondingly stored. It is provided to read the ID information.
FIG. 13A is a perspective view illustrating the structure of the jack portion 1A and the plug portion 1A, and FIG. 13B is a diagram illustrating the configuration of the third embodiment. It is the figure which showed typically about the internal wiring state with respect to each mechanical switch in.

  First, in FIG. 13A, in the plug portion 20A, a first protrusion formation position P21, a second protrusion formation position P22, and a third protrusion formation position P23 are set in advance at predetermined positions. ID information is stored depending on the presence or absence of the protrusion Jh at P21, P22, and P23. In the example of this figure, the case where the protrusion Jh is formed at all of the first protrusion formation position P21, the second protrusion formation position P22, and the third protrusion formation position P23 is shown. The protrusion Jh at the first protrusion formation position P21 is the first protrusion Jh1, the protrusion Jh at the second protrusion formation position P22 is the second protrusion Jh2, and the protrusion Jh at the third protrusion formation position P23 is the second. 3 projections Jh3.

The first mechanical switch MSW1 provided so as to face the first protrusion forming position P21 when the plug part 20A is connected to the jack section 1A on the audio player 1 side, and the second protrusion forming position P22. And a third mechanical switch MSW3 provided so as to face the third projection forming position P23.
Each of the mechanical switches MSW1 to MSW3 is turned on when the plug portion 20A is connected and the protrusion Jh is formed at the opposite protrusion formation position P, and is also at the opposite protrusion formation position P. When the protruding portion Jh is not formed or when the plug portion 20A is removed, the protrusion portion Jh is provided in an OFF state.

In addition, inside the audio player 1, as shown in FIG. 13B, one terminal of each mechanical switch MSW is grounded and the other terminal is connected via a line to which a bias voltage of a predetermined level is applied. A system controller 10 is connected.
With such a configuration, the structure pattern detection unit 12 for detecting the presence / absence of the projection Jh at each projection formation position P on the headphone 20 side by an electric signal is formed.
Specifically, when the protruding portion Jh is formed at the protruding portion forming position P on the plug portion 20A side, the line connected to the corresponding mechanical switch MSW on the jack portion 1A side becomes L, and the protruding portion Jh is formed. If not, the line connected to the corresponding mechanical switch MSW becomes H. The system controller 10 obtains ID information stored based on the presence or absence of the protrusion Jh on the headphone 20 side by determining whether the electric signal H / L obtained on the line connected to each mechanical switch MSW is different. be able to.

In the third embodiment, the process for changing and setting the filter characteristics of the NC filter 4a is performed according to the acquired ID information. In this case as well, the contents are described with reference to FIG. Since it becomes the same as that of a thing, the another description is abbreviate | omitted.

[Example 4]

In the fourth embodiment, ID information is stored based on the presence or absence of a recess at a predetermined position of the plug portion 20A, and the ID information is read by providing a switch for detecting the presence or absence of the recess on the jack portion 1A side.
FIG. 14 is a perspective view and a front view showing the structure of the plug portion 20A as a diagram for explaining the configuration of the fourth embodiment.
In the example of this figure, the case where the formation position of a recessed part is made into the existing terminal Th is shown. Specifically, the recess forming position in this case is set to the Lch audio input terminal Th-AL formed at the tip of the plug portion 20A.

  In FIG. 14, a first recess forming portion P31, a second recess forming portion P32, and a third recess forming portion P33 are set in the Lch audio input terminal Th-AL in this case. As can be seen with reference to the front view in FIG. 14, in this case, an example is shown in which recesses are formed in all of the first recess forming portion P31, the second recess forming portion P32, and the third recess forming portion P33. (In the figure, the first recess Jh11, the second recess Jh12, the third recess Jh13).

  FIG. 15 shows an internal configuration on the audio player 1 side in the fourth embodiment. In FIG. 15, the configuration (system controller 10, structure pattern detection unit 12) for reading ID information included in the audio player 1 as the fourth embodiment is mainly shown. Further, in this drawing, the tip end portion (portion where each terminal Th is formed) in the plug portion 20A is also shown.

  As shown in FIG. 15, in the structure pattern detection unit 12 provided in the audio player 1 in this case, a switch SW for detecting the presence or absence of a recess on the plug unit 20A side is provided. In this case, the switch SW is provided so as to face the recess forming portion P when the plug portion 20A is connected. In FIG. 15, for the sake of illustration, only the switch SW provided at a position facing the second recess Jh12 (second recess formation portion P32) is shown, but in practice, it is set to the plug portion 20A. Each switch SW is provided for each position facing each recess forming position P.

Here, in FIG. 15, the plug portion 20 </ b> A is connected, and FIG. 15 (a) shows a case with a recess, and FIG. 15 (b) shows a case without a recess. As shown in the figure, it is provided so that it is OFF when there is a recess and ON when there is no recess.
Specifically, the switch SW in this case includes a first metal part that receives a pressing force from the Lch audio input terminal Th-AL on the plug part 20A side when there is no recess, the first metal part, and the insulator Z. And a second metal part connected to a line from the system controller 10 to which a bias voltage of a predetermined level is applied. The second metal part is not connected to the ground in the OFF state with the recess and is connected to the ground in the ON state without the recess.

  With such a configuration of the structure pattern detection unit 12 as the fourth embodiment, an electric signal indicating the presence or absence of the recess Jh at each recess formation position P on the plug unit 20A side can be obtained. Specifically, when the recess Jh is formed at the recess formation position P (FIG. 15A), the line connected to the corresponding switch SW becomes H, and the recess Jh is not formed (FIG. 15B). ), The line connected to the corresponding switch SW becomes L. The system controller 10 determines the L / H of the electrical signal in each line connected to each of such switches SW, thereby acquiring ID information stored based on the presence or absence of the recess Jh at a predetermined position on the headphone 20 side. be able to.

In the fourth embodiment as well, the process for changing and setting the filter characteristics of the NC filter 4a according to the acquired ID information is performed. In this case as well, the content is the same as that described with reference to FIG. Therefore, the description is omitted.

[Example 5]

In the fifth embodiment, ID information is stored and read according to the resistance value of a resistance element provided on the headphone 20 side.
FIG. 16 shows an internal configuration of the audio player 1 and the headphones 20 as the fifth embodiment. Also in FIG. 16, as in FIG. 7, the internal configuration on the audio player 1 side is mainly shown by extracting the configuration corresponding to the jack portion 1A.

  16, the headphone 20 of the fifth embodiment is different from the configuration shown in FIG. 7 in that a resistor R1, a resistor R2, and a detection terminal Th-DT are added. Further, the audio player 1 according to the fifth embodiment has a detection terminal Tp-DT added to the configuration shown in FIG.

  On the headphone 20 side, the resistor R1 has one end connected to the Lch microphone output line and the other end connected to the detection terminal Th-DT. The resistor R2 has one end connected to a ground line connected to the ground terminal Th-GND, and the other end connected to a connection point between the resistor R1 and the detection terminal Th-DT.

On the headphone 20 side, the detection terminal Th-DT is provided as an independent terminal with respect to a predetermined position in the plug portion 20A, for example, as shown in FIG.
Correspondingly, the detection terminal Tp-DT on the audio player 1 side is provided at a position where the plug part 20A comes into contact with the detection terminal Th-DT when the plug part 20A is positioned and connected by the positioning part X (illustrated). Is omitted).
As shown in FIG. 16, the detection terminal Tp-DT on the audio player 1 side is connected to the system controller 10.

Here, as described above, when the headphones 20 are connected to the audio player 1 side, the microphone bias voltage Vbias at a predetermined level is applied to the microphone output line from the audio player 1 side. Therefore, according to the configuration described above, an intermediate potential of the microphone bias voltage Vbias divided by the resistors R1 and R2 is obtained at the detection terminal Th-DT on the headphone 20 side.
Here, if this intermediate potential is Vmid and the resistance values of the resistors R1 and R2 are Rv1 and Rv2, respectively, the intermediate potential Vmid is

Vmid = Vbias · Rv2 / (Rv1 + Rv2)

It is represented by In this case, since the microphone bias voltage Vbias can be regarded as a constant level, according to the above equation, the intermediate potential Vmid is determined by the ratio of the resistance values Rv1 and Rv2 of the resistors R1 and R2. In other words, the ID information can be stored in a form that can be read by the audio player 1 by setting the ratio of the resistance values Rv1 and Rv2.

According to the configuration shown in FIG. 16, the intermediate potential Vmid is obtained at the detection terminal Tp-DT on the audio player 1 side in response to the plug portion 20A being connected. Based on the result of detecting the intermediate potential Vmid obtained at the detection terminal Tp-DT in this way, the system controller 10 can obtain the ID information stored by the ratio of the resistance values Rv1 and Rv2.
For confirmation, in this case, the detection terminal Tp-DT functions as the structure pattern detection unit 12.

  When the ID information is stored according to the ratio of the resistance values Rv1 and Rv2 of the resistors R1 and R2 that divide the microphone bias voltage Vbias as in the fifth embodiment, the type of ID information that can be stored is an error of the resistance value or the system controller. It is determined depending on the detection accuracy (resolution) of the voltage value on the 10 side.

In the fifth embodiment, processing for changing and setting the filter characteristics of the NC filter 4a is performed according to the acquired ID information. In this case as well, the contents are described with reference to FIG. Since it becomes the same as that of a thing, the another description is abbreviate | omitted.
In the example of FIG. 16, the case where the resistor R1 is connected to the Lch microphone output line is illustrated.

[Example 6]

In the sixth embodiment, ID information is stored and read according to the presence or absence of a light guide material at a predetermined position on the headphone 20 side.
FIG. 18A is a perspective view showing the structure of the jack portion 1A and the plug portion 1A, and FIG. 18B is a diagram for explaining the configuration of the sixth embodiment. The internal structure of the part mainly related to reading ID information is extracted and shown.

18A, in the plug portion 20A of the headphone 20 in this case, the first light guide portion formation position P41, the second light guide portion formation position P42, and the third light guide portion formation position P43 are at predetermined positions. The ID information is stored depending on the presence or absence of the light guide portion Oh at each of the formation positions P41, P42, and P43. As shown in the drawing, the light guide part Oh at the first light guide part formation position P41 is the first light guide part Oh1, and the light guide part Oh at the second light guide part formation position P42 is the second light guide part Oh2, and the third light guide. The light guide part Oh at the part formation position P43 is the third light guide part Oh3.
Each light guide part Oh1, Oh2, Oh3 has transparency, for example, comprises transparent glass, transparent resin, etc.

Further, in this case, the jack portion 1A on the audio player 1 side is provided so as to face the first light guide portion formation position P41 when the plug portion 20A is connected [first light emitting portion Op−. E1, first light detection unit Op-D1] and [second light emission unit Op-E2, second light detection unit Op-D2] provided to face the second light guide unit formation position P42. And a set of [third light emitting unit Op-E3, third light detecting unit Op-D3] provided so as to face the third light guide unit formation position P43.
Each of the light emitting units Op-E1, Op-E2, and Op-E3 includes a light emitting element such as an LED (Light Emitting Diode). Each of the light detection units Op-D1, Op-D2, and Op-D3 includes a light detection element (photoelectric conversion element) such as a phototransistor.

As shown in FIG. 18B, each light emitting section Op-E1, Op-E2, Op-E3 is connected to the system controller 10. Each of the light detection units Op-D1, Op-D2, Op-D3 is also connected to the system controller 10.
In this case, the system controller 10 performs ON / OFF control of the light emission operations of the light emitting units Op-E1, Op-E2, and Op-E3. Moreover, the level detection signal (electric signal) from each photon detection part Op-D1, Op-D2, Op-D3 is detected.

In this case, each light emitting part Op-E1, Op-E2, Op-E3 and each light detection part Op-D1, Op-D2, Op-D3 function as the structure pattern detection part 12. That is, it functions as a part for detecting the presence or absence of the light guide part Oh at each light guide part forming position P on the headphone 20 side by an electric signal.
When the light guide part Oh is formed at the light guide part formation position P on the plug part 20A side, the light guide part Oh is turned on by the light emitted by the corresponding light emitting part Op-E, and this lighting light corresponds. Is detected by the photodetection unit Op-D. That is, the detection signal by the corresponding light detection unit Op-D becomes H. On the other hand, when the light guide part Oh is not formed at the light guide part forming position P, the detection signal from the corresponding light detection part Op-D becomes L because there is no lighting part.
In this way, the system controller 10 obtains the ID information stored based on the presence or absence of the light guide unit Oh on the headphone 20 side by determining the H / L of the detection signal from each light detection unit Op-D. be able to.

Here, also in the sixth embodiment, processing for changing and setting the filter characteristics of the NC filter 4a according to the acquired ID information is performed.
The flowchart of FIG. 19 shows the contents of the filter characteristic change setting process to be executed in the sixth embodiment. As can be seen by comparing FIG. 19 with the previous FIG. 11, the system controller in this case As the process on the 10th side, first, when a plug is connected in step S101, a process for turning on each light emitting unit Op-E is executed in step S301. In the subsequent step S302, as the ID reading process, a process of acquiring ID information from the result of the determination of the H / L of the detection signal by each light detection unit Op-D is executed, and in the next step S303 Processing for turning off each light emitting unit Op-E is executed.
The subsequent processing on the system controller 10 side and the processing on the DSP 4 side are the same as those described with reference to FIG. 11, so a repetitive description is omitted (the same step numbers are assigned to the processing having the same contents). is doing).

  Note that, in FIG. 18, as an example, the case where both the light emitting unit Op-E and the light detecting unit Op-D are provided at the position facing each light guide unit forming position P is illustrated, but the light emitting unit Op− Regarding E, it is not always necessary to provide one for each light guide portion forming position P. For example, only one light emitting part Op-E that is common to each light guide part forming position P may be provided.

In the example of FIG. 18, for example, transparent glass or transparent resin is provided as the light guide unit Oh. However, as the light guide unit Oh, for example, a mirror-like member that reflects light from the light emitting unit Op-E. Can also be used. The light guide section Oh in this case does not need to have a structure having a depth in the light incident direction as shown in FIG. 18, and is, for example, a thin plate like the conductive plate Eh in FIG. A structure may be provided and attached to a predetermined position.
For confirmation, the “light guide” in this case is used to guide the light emitted from the light emitting unit Op-E to the light detecting unit Op-D. It is.

[Example 7]

In the seventh embodiment, ID information is stored and read according to the number of irregularities of the key-like portion at a predetermined position on the headphone 20 side.
FIG. 20 is a perspective view and a front view showing the structure of the plug portion 20A in the headphone 20 as the seventh embodiment.
In FIG. 20, the plug portion 20A in this case is set with a key-shaped portion forming position P51 for forming a key-shaped portion Jh21 having a continuous uneven shape at a predetermined position. In this case, the key-like portion formation position P51 is set at any terminal Th. In the example of this figure, the case where the key-shaped part formation position P51 is set in the Lch audio input terminal Th-AL formed at the tip of the plug part 20A is shown.
In this case, as the key-shaped portion Jh formed at the key-shaped portion formation position P51, as shown in the figure, two concave portions and one convex portion formed so as to be inserted between the two concave portions It shall have.

  FIG. 21 is a diagram schematically illustrating an internal configuration on the audio player 1 side according to the seventh embodiment. FIG. 21 mainly shows the configuration for reading ID information (system controller 10, structure pattern detection unit 12) included in the audio player 1 as in FIG. 15. Also in this drawing, the tip portion where each terminal Th is formed in the plug portion 20A is also shown.

  In FIG. 21, the audio player 1 of the seventh embodiment is also provided with a structure pattern detection unit 12 having the same configuration as that of the fourth embodiment shown in FIG. The switch SW provided in the structural pattern detection unit 12 in this case is provided so as to face the key-shaped portion formation position P51 when the plug portion 20A is connected.

  Here, in FIG. 21, as a transition from FIG. 21 (a) → FIG. 21 (b) → FIG. 21 (c), a state in which the plug portion 20A is inserted (connected) into the jack portion 1A is schematically shown. ing. FIG. 21A shows a state in which the convex portion of the key-like portion Jh21 passes over the switch SW (state A), and FIG. 21B shows a second concave portion of the key-like portion Jh21 over the switch SW. FIG. 21C shows a state after the entire key-like portion Jh21 has passed over the switch SW (referred to as state C).

FIG. 22 shows a waveform deformation of an electric signal obtained by the structural pattern detection unit 12 in response to the plug unit 20A being inserted as described above.
The H period up to the time point t1 in the figure represents the period during which the tip (tapered) portion of the Lch audio input terminal Th-AL in the plug portion 20A passes. The switch SW is turned on and the signal level becomes L level (t1-t2) in a period until the first recess of the key-like portion Jh21 is reached after the tip portion has passed. When the first concave portion is reached, the switch SW is turned OFF and the signal level becomes H (t2-t3). Further, when the first concave portion passes and reaches the convex portion, the switch SW is turned ON and the signal level becomes L (t3-t4: state A). When the convex portion passes and reaches the second concave portion, the switch SW is turned OFF and the signal level is set to H (t4-t5: state B). After the second concave portion has passed, The switch SW is turned ON and the signal level becomes L (state C).

In this case, the system controller 10 stores the ID information stored by the number of protrusions and recesses of the key-like portion Jh21 based on the electrical signal obtained by the structure pattern detecting portion 12 corresponding to the connection of the plug portion 20A as described above. get.
Here, as can be understood from the above description, the number of irregularities in the key-like portion Jh21 is detected by counting the number of falling points to the L level as indicated by the broken-line arrows in FIG. Can do. At this time, whether or not it is the falling point in the key-like portion Jh21 can be determined by whether or not the falling point at the time point t1 in FIG. 22 is detected. That is, the falling point at this time point t1 is a point indicating that the key-like portion Jh21 reaches from these points. Therefore, by counting the number of falling points after the falling point, unevenness in the key-like portion Jh21 is obtained. Can be detected (counted).
However, in order to properly detect the number of irregularities in the key-like portion Jh21, it is important to set the count end point as well as the count start point. In this example, the count end point is set after a predetermined time has elapsed since the detection of the count start point (the first H → L falling point as time t1) (time t6 in FIG. 22). If the length of time set as the “predetermined time” is too short, the count ends before all of the key-like portion Jh21 passes. In this case, the ID information cannot be read properly. End up. On the other hand, if it is too long, it takes more time than necessary to read the ID information, resulting in a longer time for the user to wait.
In the case of this example, the time length set as the “predetermined time” is set to the maximum time length assumed as the time length required for connection of the plug unit 20A.

  The flowchart of FIG. 23 shows processing operations to be executed on the audio player 1 side as the seventh embodiment. In this case as well, the processing on the DSP 4 side is the same as that shown in FIG. 11 described above, and therefore the description thereof is omitted. In this figure, only the processing operation executed on the system controller 10 side is shown.

In FIG. 23, in step S401, the process waits until an H → L falling point is detected. That is, the process waits until the first falling point (time point t1) is detected in the detection signal from the structure pattern detection unit 12 shown in FIG.
If a falling point is detected, the time count is started in step S402, and then the count value n is reset to 0 in step S403.

When the reset process of step S403 is executed, either of the re-detection of the falling point of H → L or the elapse of a predetermined time is waited by steps S404 and S405.
Specifically, in step S404, if an affirmative result is obtained by redetecting the falling point of H → L, the count value n is incremented by 1 (n = n + 1) in step S406, and then the process proceeds to step S404. It is made to go back. On the other hand, if a negative result is obtained in step S404 that the falling point of H → L has not been detected again, the process proceeds to step S405, and whether a predetermined time (t1-t6) set in advance has elapsed. Determine whether or not.
If a negative result is obtained in step S405 that the predetermined time has not elapsed, the process returns to step S404.

In step S405, if a positive result is obtained that the predetermined time has elapsed, the process proceeds to step S406 to reset the time count, and in step S408, an ID is acquired from the count value n.
After executing the processing in step S408, the same processing as in steps S103 to S105 described above with reference to FIG. 11 is executed as illustrated. Thereby, also in this case, the filter characteristic corresponding to the ID information stored on the headphone 20 side can be set in the NC filter 4a.

In the seventh embodiment, the case where the key-shaped portion forming portion P51 (key-shaped portion Jh21) is provided only at one place and only one switch SW is provided corresponding to this is illustrated. If a plurality of switches SW are used, the amount of information that can be stored as an ID can be further increased.
As described above, when a plurality of sets of the key-like portion Jh21 and the switch SW are used, the system controller 10 performs, for example, the processes from steps S401 to S407 in FIG. Thus, the number of irregularities for each key-like portion Jh21 is counted. In the ID acquisition process in step S408, ID information is acquired from information on the number of protrusions and recesses for each key-like portion Jh21.

In the seventh embodiment, since the contact portion of the switch SW has a mechanical mechanism, when counting the number of projections and depressions from the detection signal of the structure pattern detection unit 12, the processing for actually preventing chattering is performed. It is preferable to add.

[Summary]

As described above, according to the present embodiment, the filter characteristic of the NC filter 4a to be set corresponding to the headphone 20 can be variably set according to the type of the headphone 20. .
Thereby, the outstanding system which can change freely the headphones 20 to be used as a sound reproduction system which has a noise canceling function is realizable.

  And according to this Embodiment, the variable setting of the filter characteristic according to the headphones 20 to be used can be automatically performed based on the ID information memorize | stored in the headphones 20 side. Thus, for example, it is possible to realize a highly convenient system that reduces the operation burden on the user as compared with the case of selecting another headphone 20 to be used based on the user operation. In addition, the headphone 20 different from the headphone 20 that is actually used is selected due to a user's misunderstanding or the like, so that an appropriate noise canceling effect cannot be obtained effectively. Can be prevented.

  Further, regarding each embodiment, as a second embodiment, the method using the conductive plate Eh is, for example, as in the first embodiment, an analog signal mainly including a microphone signal and an audio signal, and a digital mainly including the system controller 10. There is an advantage that noise generation can be prevented because the signal portions are not mixed. Further, in the second embodiment, it is only necessary to attach the conductive plate Eh on the plug portion 20A side in storing the ID information, and there is an advantage that the manufacturing process can be simplified in this respect.

Further, as a seventh embodiment, in the method of reading the ID stored by the key-like portion Jh, the value that can be expressed by one formation position P can be larger than the two values “0, 1”. , The amount of information that can be stored as an ID can be increased accordingly.
In the case of the seventh embodiment, the connection of the plug unit 20A can be detected by the process of step S401 in FIG. In this regard, in the seventh embodiment, the plug connection presence / absence detecting unit 11 shown in FIG. 4 (FIG. 7) can be omitted.

Similarly, in the fifth embodiment, a potential corresponding to the intermediate potential Vmid is obtained at the detection terminal Tp-DT according to the connection of the plug portion 20A. By doing so, it is possible to detect whether or not the plug portion 20A is connected. That is, also in the fifth embodiment, the plug connection presence / absence detecting unit 11 can be omitted.

[Modification]

Although the embodiments of the present invention have been described above, the present invention should not be limited to the specific examples described above.
For example, in the description so far, only the case where the number of formation positions P is three at the maximum is exemplified, but the number of formation positions P is not particularly limited.

Here, if the set number of formation positions P is increased, information with a larger number of bits can be stored. When the formation position P is increased in this way, the ID information can include not only information indicating the type of the headphones 20 but also information for identifying variation in characteristics of each model, for example. As a specific example, for example, information indicating the type of the model is stored in the lower several bits, and information indicating the characteristic of each headphone 20 is stored in the upper several bits.
Here, examples of the characteristic variation for each model include the sensitivity of the driver DRV, the sensitivity of the microphone MIC, and the shape of the frequency characteristic. For example, the driver DRV and microphone MIC sensitivity is roughly defined as “Large / Medium / Small”, and the frequency characteristic shape is roughly defined as several types. These characteristics are measured for the headphones 20 at a required timing at the time of manufacture, and each headphone 20 is classified into which category each characteristic belongs. In each headphone 20 in this case, information including information on the classification of each characteristic based on such measurement results is stored as ID information in a physical structure pattern, along with other information on the model.
On the audio player 1 side, as the ID-filter characteristic correspondence information 9a, as described above, ID information for identifying each type as well as each model and each ID information, that is, each model / characteristic. Information that associates filter characteristic information that should be set for each combination is stored.
In this case as well, the process for changing and setting the filter characteristics of the NC filter 4a based on the acquired ID information may be the same as that described in each embodiment.
By doing in this way, it is possible to change and set the filter characteristics for the headphones 20 of the same model in consideration of the characteristic variation for each individual.

  Alternatively, the gain adjustment may be performed so as to correct, for example, according to the driver DRV sensitivity or the microphone MIC sensitivity information stored as the ID information as described above. Such gain adjustment (correction) can be realized by either digital gain adjustment in the DSP 4 or analog gain adjustment for an analog signal.

Moreover, although the case where the positioning part X was provided with respect to the jack part 1A by the side of the audio player 1 was illustrated in the above description, this positioning part X can be abbreviate | omitted in Example 5, for example. That is, in the fifth embodiment, the formation position of the detection terminal Th-DT on the headphone 20 side is changed from the position shown in FIG. 17, and the ring shape is coaxial with the audio input terminal Th-A and the microphone output terminal Th-M, for example. In this case, the positioning portion X can be dispensed with in particular (in this case, it goes without saying that the ground terminal Th-GND also has a ring shape).
Also in other embodiments, the positioning portion X can be made unnecessary as appropriate by devising the arrangement of the respective formation positions P. For example, also in the first embodiment, the second embodiment, the sixth embodiment, and the like, if each forming position P (and the ground terminal Th-GND) is formed coaxially with the audio input terminal Th-A or the like in an independent ring shape, The positioning part X can be dispensed with.
Or in Example 7, when the number of the key-like part Jh21 is one, if the recessed part and the convex part are each formed in a ring shape, the positioning part X is unnecessary especially.

  In the above description, the operation when the plug portion 20A is pulled out is not particularly mentioned. However, when it is detected that the plug portion 20A is pulled out, the audio data is being reproduced. The playback can be paused.

  Also, when the plug unit 20A is connected, the filter characteristics are changed and set, so that playback can be paused during that time. That is, in this case, the system controller 10 controls the storage unit 2 and the reproduction processing unit 3 according to the plug connection to temporarily stop reproduction, and then executes the filter characteristic change setting process described in each embodiment. . Then, the reproduction is resumed in response to the notification of the completion of the filter characteristic setting from the DSP 4.

  In the description so far, the case where the filter (NC filter) that gives signal characteristics for noise canceling is configured with a digital filter is exemplified. However, the NC filter can also be configured with an analog filter.

  In the above description, the filter characteristic for noise canceling is changed based on the ID information stored in the headphone device. However, the equalizing characteristic (filter characteristic) in the equalizer 4b is changed based on the ID information. You can also change it. Alternatively, in addition to the equalizing characteristic, it is also possible to variably set characteristics of a filter that gives various acoustic effects such as a reverberation effect.

  In the above description, the case where the signal processing device of the present invention is configured as an audio player has been exemplified. However, as the signal processing device of the present invention, for example, other mobile phones having a noise canceling function are available. It can also be implemented as a device form.

It is a figure which shows the model example about the noise cancellation system of the headphone apparatus by a feedback system. It is a Bode diagram which shows the characteristic about the noise canceling system shown in FIG. It is a figure which shows the model example about the noise canceling system of the headphone apparatus by a feedforward system. It is the block diagram which showed the internal structure of the signal processing apparatus of embodiment. It is a figure for demonstrating the kind of headphone apparatus with which the signal processing apparatus of embodiment corresponds. It is the figure shown about the data structure of ID-filter characteristic corresponding | compatible information. It is the figure which showed about the internal structure of the headphone apparatus connected with the signal processing apparatus of embodiment, and the internal structure of the connection part with the said headphone apparatus mainly in a signal processing apparatus. It is a figure for demonstrating the arrangement | positioning relationship of the driver (speaker) and microphone which a headphone apparatus has. It is a figure for demonstrating the structure as Example 1-1. It is a figure for demonstrating the structure as Example 1-2. 3 is a flowchart showing processing operations to be executed to realize the operation as the first embodiment. FIG. 6 is a diagram for explaining a configuration of a second embodiment. FIG. 10 is a diagram for explaining a configuration of Example 3. FIG. 10 is a diagram for explaining a configuration of a headphone device to which a signal processing device according to a fourth embodiment corresponds; FIG. 10 is a diagram for explaining a configuration of a signal processing device according to a fourth embodiment. FIG. 10 is a diagram for explaining a configuration of a fifth embodiment. FIG. 10 is a diagram for explaining a configuration of a headphone device to which a signal processing device according to a fifth embodiment corresponds; FIG. 10 is a diagram for explaining a configuration of Example 6. 14 is a flowchart showing processing operations to be executed to realize the operation as the sixth embodiment. FIG. 10 is a diagram for describing a configuration of a headphone device to which a signal processing device according to a seventh embodiment corresponds; FIG. 10 is a diagram for explaining a configuration of a signal processing device according to a seventh embodiment. As a diagram for explaining a method of reading identification information in the signal processing apparatus according to the seventh embodiment, it is a diagram illustrating a waveform deformation of an electrical signal obtained by a structural pattern detection unit in response to insertion of a plug unit. 18 is a flowchart showing processing operations to be executed in order to realize the operation as the seventh embodiment.

Explanation of symbols

  1 audio player, 1A jack section, 2 storage section, 3 playback processing section, 4 DSP, 5 D / A converter, 6 power amplifier, 7 microphone amplifier, 8 A / D converter, 9 memory, 9a ID-filter characteristics Corresponding information, 10 system controller, 11 plug connection presence / absence detection unit, 12 structure pattern detection unit, 13 external communication interface, 14 display unit, Tp-M microphone input terminal, Tp-A audio output terminal, Td data communication terminal, 20 headphones 20A plug part, Th-M microphone output terminal, Th-A audio input terminal, Tp-GND, Th-GND ground terminal, MIC microphone, DRV driver, X positioning part, Ep1-Ep3 electrode, P1-P3 Third electrode formation position, Eh1 to Eh3 First to third electrodes, Ep11a to Ep13a Ep11b to Ep13b electrode, P11 to P13 first to third conductive plate forming position, Eh11 to Eh13 first to third conductive plate, MSW mechanical switch, P21 to P23 first to third projecting portion forming position, Jh1 to Jh3 1st to 3rd protrusion, P31 to P33 1st to 3rd recess formation position, Jh11 to Jh13 1st to 3rd recess, SW switch, R1, R2 resistance, Th-DT, Tp-DT detection terminal, Op-E1 -Op-E3 1st-3rd light emission part, Op-D1-Op-D3 1st-3rd light detection part, P41-P43 1st-3rd light guide part formation position, Oh1-Oh3 1st-3rd Light guiding part, P51 key-like part forming position, Jh21 key-like part

Claims (9)

A signal processing device capable of connecting a headphone device in which identification information is stored according to a physical structure pattern,
A structure pattern detecting means configured to detect an electrical signal corresponding to the physical structure pattern when connected to the headphone device;
Identification information acquisition means for acquiring the identification information based on the electrical signal detected by the structure pattern detection means;
Signal processing means for performing signal processing so as to give a required signal characteristic to a signal supplied to the headphone device;
Correspondence relation information representing the correspondence relation between the identification information stored in the headphone device and the signal processing characteristics to be set in the signal processing means when the headphone device specified by the identification information is connected is stored. Storage means,
Control means for performing control so that a signal processing characteristic corresponding to the identification information acquired by the identification information acquisition means is set in the signal processing means based on the correspondence information;
A signal processing apparatus comprising: The identification information is stored as a physical structure pattern as the presence or absence of an electrode at a predetermined position of a connection portion of the headphone device with the signal processing device,
The structure pattern detection means includes
By including an electrode provided so as to be in contact with the predetermined position when connected to the headphone device, an electric signal corresponding to the structure pattern is detected.
The signal processing apparatus according to claim 1. The identification information is stored as a physical structure pattern as the presence or absence of a conductive material at a predetermined position of a connection portion with the signal processing device in the headphone device,
The structure pattern detection means includes
It is configured to detect an electrical signal corresponding to the structure pattern by including two electrodes provided so that both are in contact with the predetermined position when connected to the headphone device.
The signal processing apparatus according to claim 1. The identification information is stored as a physical structure pattern as the presence or absence of a concave or convex portion at a predetermined position of a connection portion with the signal processing device in the headphone device,
The structure pattern detection means includes
By providing a switch that is provided at a position facing the predetermined position when connected to the headphone device and is turned on / off according to the concave portion or the convex portion. Configured to detect electrical signals,
The signal processing apparatus according to claim 1. The headphone device is provided with a voltage supply line that receives a voltage supply at a predetermined level from the signal processing device, and the identification information includes a difference in resistance value of a resistance element connected to the voltage supply line. And is stored by the physical structure pattern as
The structure pattern detection means includes
By including a terminal portion connected to the resistance element when connected to the headphone device, an electric signal corresponding to the structure pattern is detected.
The signal processing apparatus according to claim 1. The identification information is stored as a physical structure pattern as the presence or absence of a light guide material at a predetermined position of a connection portion with the signal processing device in the headphone device,
The structure pattern detection means includes
By including a light emitting element and a light receiving element provided so as to face the predetermined position when connected to the headphone device, an electric signal corresponding to the structure pattern is detected. ,
The signal processing apparatus according to claim 1. The identification information is stored as a physical structure pattern as the number of irregularities at a predetermined position of the connection portion of the headphone device with the signal processing device,
The structure pattern detection means includes
An electrical signal corresponding to the structure pattern is provided by providing a switch that is provided at a position opposite to the predetermined position when the headphone device is connected and is turned on / off according to the unevenness. Configured to be detected,
The signal processing apparatus according to claim 1. The headphone device includes a microphone,
The signal processing means performs signal processing so as to give a signal characteristic for noise cancellation to a signal supplied from the microphone.
The signal processing apparatus according to claim 1. A structure pattern detecting means configured to detect an electrical signal corresponding to the physical structure pattern when connected to a headphone device in which identification information is stored by a physical structure pattern, and the headphones A signal processing method in a signal processing apparatus comprising signal processing means for performing signal processing so as to give a required signal characteristic to a signal supplied to the apparatus,
An identification information acquisition step of acquiring the identification information based on the electrical signal detected by the structure pattern detection means;
Based on the correspondence information representing the correspondence between the identification information stored in the headphone device and the signal processing characteristics to be set in the signal processing means when the headphone device specified by the identification information is connected, A control step for performing control so that a signal processing characteristic corresponding to the identification information acquired by the identification information acquisition step is set in the signal processing means;
A signal processing method comprising:

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