JP3552273B2 - Headphone equipment - Google Patents

Description

[0001]
[Industrial applications]
The present invention relates to a headphone device having an infrared signal transmission / reception function. More specifically, in an infrared transmitter that modulates an audio signal and transmits / receives the infrared signal, the signal processing is performed on the received audio signal in accordance with the movement of the receiving device, particularly, the rotational movement, and an infrared signal that gives a natural sound image localization to the reproduced sound. It is intended to provide a headphone system having a transmission / reception function.
[0002]
[Prior art]
FIG. 5 shows a block diagram of a headphone device using a conventional infrared signal transmitting / receiving device. In FIG. 5, an infrared signal obtained by modulating an audio signal is transmitted from an infrared transmitting unit 50, and an infrared signal received by an infrared receiving unit 51 is amplified by an RF amplifier 52, then demodulated by a detector 53, and amplified by an amplifier 54. , 55 and then supplied to headphones 56.
[0003]
In a headphone device using such an infrared signal transmitting / receiving device, a cord is not required for the headphone 156 main body, and the trouble that the cord is entangled with the listener is eliminated. Therefore, the listener can freely move his body while listening to the audio signal.
[0004]
However, such a headphone device has a drawback that the reproduced sound image is always localized in the head even when the listener moves, resulting in an unnatural sound field reproduction as compared with the speaker reproduction.
[0005]
[Problems to be solved by the invention]
As described above, when an audio signal is reproduced in a conventional headphone device including an infrared transmitting / receiving headphone, the reproduced sound image is localized in the head, and there is a disadvantage that an unnatural sound field is reproduced.
[0006]
[Means for Solving the Problems]
F Ddohon apparatus of the present invention, the infrared signal the audio signal is an infrared transmitter by Rioku signal is modulated, received by the light receiving element includes an infrared receiver for demodulating the aforementioned audio signal is demodulated by the infrared receiver by the audio signal to drive the headphone 15 a f Ddohon device for audio playback, infrared receiver is provided with at least two light receiving elements 1, the ratio of the light receiving level of each of the light receiving elements 1, 2 Level comparing means 121 for comparison, rotation angle calculating means 122 for calculating the rotation angle of the device equipped with the infrared receiver according to the comparison result of the level comparing means 121, and the angle calculated by the rotation angle calculating means 122 And a signal processing means 123 for changing the output audio signal.
[0008]
As shown in FIGS. 1 to 4, a headphone device having an infrared signal transmission / reception function according to the present invention directly uses a modulated audio signal reception signal as an infrared signal for comparing light reception levels.
[0009]
[Action]
According to the present invention, it is possible to compare the light receiving levels of a plurality of light receiving elements and calculate the rotation angle of the light receiving unit from this, so that optimal signal processing can be performed on the received signal, and even when listening to headphones. Natural sound field feeling can be secured.
[0011]
Further, according to the present invention, since the modulated audio signal reception signal is used as it is as an infrared signal for comparing the light reception level, it is not necessary to provide a new optical transmission / reception device for detecting the rotation angle, and the entire device is small and inexpensive. Can be configured.
[0012]
【Example】
First, before describing an embodiment of the present invention, an embodiment of an audio reproducing apparatus filed by the applicant of the present invention earlier will be described with reference to FIGS. 6 and 7. FIG. The audio reproducing apparatus of the previous example has a sound-reproducing apparatus that reproduces an acoustic signal with headphones, and has a sense of localization equivalent to that when sound is reproduced from a speaker that should be placed in a predetermined positional relationship when the sound signal is reproduced with a speaker. The sound field feeling and the like can be obtained not only for one person but also for a plurality of listeners simultaneously by wirelessly reproducing through headphones.
[0013]
That is, the audio reproducing apparatus of the above-described example is used for a system that wirelessly reproduces a multi-channel acoustic signal collected by a stereo or the like using headphones. In particular, digitized sound signals recorded or transmitted in each channel for the purpose of localizing each sound image in a predetermined positional relationship (for example, front right, front left, center, etc. of the listener) are wirelessly transmitted. This is used when reproducing with headphones or the like.
[0014]
Here, in the transmitting section shown in FIG. 6, first, the transmitter 64 transmits a digitized acoustic signal of each channel, which has been subjected to convolution integration with impulse responses stored in the memories 160, 180, 100, 120 in advance. 7, the receiver 65 on the side of the listener 230 equipped with the headphones 240 receives an acoustic signal, and the digital angle detector 280 controls the head movement of the listener 230 relative to the reference direction by a certain angle or Detected at predetermined angles, and converted into a digital address signal representing a magnitude including a direction in the address control circuit 340. Based on this address signal, a digitally recorded control signal from the virtual sound source position with respect to the reference direction of the head to both ears, which is recorded in the memory 350 in advance, is read. The control signals and the acoustic signals are corrected and changed in real time by the control devices 500, 510, 520, and 530. As a result, a reproduction effect as if the reproduction sound is heard from a speaker placed at the virtual sound source position can be realized wirelessly.
[0015]
In the embodiment of the present invention, the digital angle detector 280, the address control circuit 340, the memory 350, and the control devices 500 and 510 in the receiving section shown in FIG. , 520, and 530. In the above example, the rotation angle of the head is detected by the digital angle detector 280 by geomagnetism independently of the received audio signal. In this example, the rotation angle of the head is determined by the reception level of the received infrared signal. The difference is that they are detected. 1 to 4, a block diagram of a headphone device having an infrared signal transmitting / receiving function of the present invention will be shown, and description will be given according to each embodiment.
[0016]
FIG. 1 is a block diagram of an embodiment of a headphone device having an infrared signal transmitting / receiving function of the present invention. In FIG. 1, an infrared signal in which a voice signal is modulated is transmitted from an infrared transmitting unit (not shown), and the infrared signal received by the infrared receiving units 1 and 2 is amplified by the RF amplifier 3 and then demodulated by the detector 4. The signal is input to the signal processing device 5.
[0017]
The light receiving level of the infrared light receiving unit 1 is detected by the infrared light receiving level detector 8, encoded by the A / D converter 10, and taken into the microprocessor 12. Similarly, the light receiving level of the infrared light receiving unit 2 is detected by the infrared light receiving level detector 9, encoded by the A / D converter 11, and taken into the microprocessor 12.
[0018]
FIG. 2 is a diagram showing a microprocessor of an embodiment of a headphone device having an infrared signal transmitting / receiving function according to the present invention. In FIG. 2, output signals 13 and 14 of the A / D converter supplied to the microprocessor 12 are input to the level comparison device 121. Here, the level ratio is output, and the rotation angle calculating device 122 calculates the rotation angle of the infrared light receiving units 1 and 2, that is, the head to which the headphones 15 are attached.
[0019]
Based on the result, the signal processing control device 123 supplies the signal processing device 5 with a control signal 16 corresponding to a signal processing algorithm that provides an optimal sound field according to the rotation angle of the head. The signal processing device 5 performs signal processing with the control signal 16 supplied from the signal processing control device 123, and outputs the result to the amplifiers 6 and 7. The processing here may be performed as an analog signal, or the signal may be converted into a digital signal and then processed, and then converted back to an analog signal. The outputs of the amplifiers 6 and 7 drive the headphones 15.
[0020]
FIG. 3 is a block diagram of another embodiment of the headphone device having an infrared signal transmitting / receiving function of the present invention. In FIG. 3, an infrared signal in which a voice signal is modulated is transmitted from an infrared transmitting unit (not shown), and the infrared signal received by the infrared receiving unit 1 is amplified by the RF amplifier 3 and then demodulated by the detector 4 to obtain a signal. Input to the processing device 5. The light receiving level of the infrared light receiving unit 1 is detected by the infrared light receiving level detector 8, encoded by the A / D converter 10, sampled by the microprocessor 30, and taken in.
[0021]
FIG. 4 is a diagram showing a microprocessor of another embodiment of the headphone device having an infrared signal transmitting / receiving function of the present invention. 4, the output signal 17 of the A / D converter 10 input to the microprocessor 30 is stored in the level storage device 92 in the microprocessor 30. Further, the output signal 17 is compared with the data sampled and recorded before this in the level comparator 91. The result of this comparison is supplied to the rotation angle calculation device 93. Here, it is calculated how much the infrared light receiving unit 1, that is, the head to which the headphone 15 is attached is rotated from a position facing the front with respect to the infrared light emitting unit (not shown).
[0022]
The signal processing control device 94 supplies the control signal 17 to the signal processing device 4 so as to perform signal processing for providing an optimal sound field based on the rotation angle of the head calculated by the rotation angle calculation device 93. In this example, the position facing the infrared light emitting unit (not shown) facing the front may be initialized to the reception zero level or the maximum level in advance.
[0023]
According to the above example, the light receiving levels of the infrared light receiving sections 1 and 2 as a plurality of light receiving elements are compared, and the rotation angle of the infrared light receiving sections 1 and 2 can be calculated from the comparison. It is possible to provide a natural sound field feeling even when listening to headphones.
[0024]
According to the above example, the light receiving level of the infrared light receiving section 1 as the light receiving element is stored as needed, and the stored level is sequentially compared with the newly input light receiving level. Thus, it is possible to find a state in which the angles at which the infrared transmitting unit and the infrared receiving unit face each other match. Therefore, the rotation angle can be calculated by reading the attenuation level of the received light level with reference to this position, so that the optimum signal processing can be performed on the received signal, and when listening to the headphones. Even if it is, a natural sound field feeling can be secured.
[0025]
Further, according to the above example, since the audio signal reception signal modulated as the infrared signal for comparing the light reception level is used as it is, there is no need to provide a new optical transmission / reception device for detecting the rotation angle, and the entire device is small and inexpensive. Can be configured.
According to the above example, the infrared voice transmission / reception signal can be used as it is as the rotation angle sensor for detecting the movement of the body, so that there is no need to add a new rotation angle sensor, there is no rotation angle accumulation error, and it is inexpensive and mountable. Devices with a small area can be configured.
[0026]
【The invention's effect】
According to the present invention, it is possible to compare the light receiving levels of a plurality of light receiving elements and calculate the rotation angle of the light receiving unit from this, so that optimal signal processing can be performed on the received signal, and even when listening to headphones. Natural sound field feeling can be secured.
[0028]
Further, according to the present invention, since the modulated audio signal reception signal is used as it is as an infrared signal for comparing the light reception level, it is not necessary to provide a new optical transmission / reception device for detecting the rotation angle, and the entire device is small and inexpensive. Can be configured.
[Brief description of the drawings]
FIG. 1 is a block diagram of an embodiment of a headphone device having an infrared signal transmission / reception function of the present invention.
FIG. 2 is a diagram showing a microprocessor of an embodiment of a headphone device having an infrared signal transmitting / receiving function of the present invention.
FIG. 3 is a block diagram of another embodiment of a headphone device having an infrared signal transmitting / receiving function of the present invention.
FIG. 4 is a diagram showing a microprocessor of another embodiment of a headphone device having an infrared signal transmitting / receiving function of the present invention.
FIG. 5 is a block diagram of a headphone device using a conventional infrared signal transmitting / receiving device.
FIG. 6 is a block diagram of an embodiment of a transmitting section of the audio reproducing apparatus, which the applicant of the present invention has previously filed.
FIG. 7 is a block diagram of an embodiment of a receiving section of the audio reproducing apparatus which the applicant of the present invention has previously filed.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Infrared light receiving part 2 Infrared light receiving part 3 RF amplifier 4 Detector 5 Signal processing device 6, 7 Amplifier 8, 9 Infrared light receiving level detector 10, 11 A / D converter 12 Microprocessor 13 Output signal 14 Output signal 15 Headphones 16 Control signal 121 Level comparison device 122 Rotation angle calculation device 123 Signal processing control device 17 Output signal 18 Control signal 30 Microprocessor 91 Level comparison device 92 Level storage device 93 Rotation angle calculation device 94 Signal processing control device

Claims (2)

An infrared signal the audio signal is an infrared transmitter by Rioku signal is modulated, received by the light receiving element includes an infrared receiver for demodulating the said audio signal,
The audio signal demodulated by the infrared receiver to drive headphones A f Ddohon device for audio playback,
The infrared receiver is provided with at least two light receiving elements,
Level comparing means for comparing the ratio of the light receiving level of each light receiving element,
Rotation angle calculation means for calculating the rotation angle of the device equipped with the infrared receiver according to the comparison result of the level comparison means,
F Ddohon apparatus characterized in that a signal processing means for changing the output audio signal in accordance with the angle calculated by the rotation angle calculation means. F Ddohon device according to claim 1, characterized in that the audio signal received signals modulated as an infrared signal for comparing the received light level is used as it is.

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