TW519849B - System and method for providing rear channel speaker of quasi-head wearing type earphone - Google Patents

Abstract

A method for playing sound effect comprises: providing a quasi-head wearing type earphone or quasi-earphone with rear speaker, wherein the quasi-head wearing type earphone or quasi-earphone structure also includes an opening for receiving signals of front speaker; next, transferring front, rear, and sub-woofer signals to the related speaker; then, processing the signals transferred to the rear speaker by HRTF and device for generating virtual speaker to obtain a virtual speaker at the back side and transferring the processed signals to the rear speaker.

Description

> 19849 V. Description of the invention (1) Field of invention The invention relates to a digital sound effect system, especially a method and system for a home theater. This system allows f-type headphones or earphone-like sound Channel speakers to play the sound effects of the rear channel virtual speakers. Background of the invention:

With the rapid development of the electronics industry, sound effects with advanced acousto-optic effects on toys on computers have become commonplace. Therefore, the demand for video recorder and audio performance has become more and more urgent. In addition to the need for higher resolution and visual quality, in the field of audio frequency and sound effects, multi-channel sound effects have gradually replaced stereo sound and mono sound effects. In order to provide a home theater with a more realistic or engulfing listening experience, many have developed forms of multi-channel sound effects. Each audio channel of a multi-channel signal is sent to one of the many speakers distributed throughout the home theater to provide a thrilling sound, and the sound in it triggers all the ring-field effects. As the market share of home entertainment systems expands, other multi-channel systems are likely to become available systems for home consumers. Humans can localize sound to the left or right depending on what each ear is

519849 V. Description of the invention (2) The difference between the recognized arrival time and sound level. One type of head related transfer functions (HRTFs) is the use of fixed speaker positions to simulate position and virtual image stereo sound. The shape, body and auditory system of the human body influence how the human brain perceives where the sound originates. HRTF is a characteristic description of the human head, body, and auditory system. Therefore, the aforementioned HRTF is affected by the shape and size of the head, the shape and size of the pinnae, and the characteristics of the ear canal. HRTF is a typical function of the frequency and relative orientation between the head and the sound field source. HRTF is responsible for the frequency response (frequency response), frequency elimination (fiitering) and the delay and response inherent in the human head. By adjusting the sound signal frequency and delay of the heart 71 °, stereo sound can be simulated from a fixed speaker position. U.S. Patent No. 5,729, 6 1 2 entitled "Apparatus and Method for Measuring HRTF" was filed on August 5, 1994 (fi 1 ed). The above-mentioned conventional technology discloses an accurate driving sound conversion function (Such as HRTF). HRTF can be calculated separately from detailed actions of head, ears, and body and time expenditure measurements. The above-mentioned individual measurements are converted to a conversion function using an appropriate processing device, which The purpose is to adjust the sound signal output characteristics of individual headphones and simulate their stereo sound in position.

519849 V. Description of the invention (3) Because HRTF is a sound effect model that simulates the three-dimensional space by the sounds heard by the human ear, and the parameters of the stereo sound effect corresponding to each area in the space are its distance, The azimuth and elevation are determined, and the above conditions are exactly when the listener feels that the sound is in the most realistic atmosphere when playing the sound effect. H R T F uses an artificial head or microphones inside the human ear. Each sound source must be measured in the frequency range of 20HZ ~ 20KHZ, and the result becomes a preliminary HRTF database (1 ibrary). The above-mentioned preliminary HRTF database generates the parameters required by the dsp digital wavelet through a mathematical operation process. As long as the single-wave sound is processed by the left and right digital filters, the true 3D stereo sound can be simulated through the headphone device. The HRTF three-dimensional spatial audio device applied to a personal computer includes an analog ring field multi-speaker with two physical speakers to transport five "virtual speakers" to the space surrounding the listener and make Home theater gets sound effects. However, 5.1 CH DVD or 4 CH 3D games use HRTF to generate virtual speakers on the back to replace the physical speakers that provide DVDs and encounter some difficult 3D games. The headphone unit must be capable of providing good bass. The bass has a larger wavelength than the human head, so there is no direct information on the bass.

519849 V. Description of the invention (4) Since the structure of the headphone device. A subwoofer called a sub-woofer speaker is effective for all channels. Unfortunately, the back bass has to be filtered out of the back signal. θ Therefore, there is a great need for a sound control device to overcome the difficulties mentioned above. Object and Summary of the Invention: The object of the present invention is to disclose a control system of a sound effect system. Another object of the present invention is to provide a system for a virtual speaker with a rear channel similar to headphones. The method of playing the S effect when biting includes: providing a headphone or a headphone structure with a rear channel in it, and a headphone and a headphone structure including receiving front speaker signals. The frightened through hole (opemng), the signal of the receiving sound is transmitted to the relevant speaker ^, depending on the weight, and then; = = the distance between the front speakers is processed to generate the rear two f pseudo speakers. Headphones and speakers

519849 ⑸ i. Description of the invention I. Detailed description: Please refer to the intention. The above speakers 1 4. Rear speakers, speakers and rear left devices or stereo speakers. The speakers are virtual speakers instead of top speakers. They cannot cover the sound of the entire subwoofer opening. On the head-mounted type, the sound effect diagram is shown below. It is a theater drama element 5 · 1 D sound system 1 〇 System 1 〇 includes: front right speaker! 2. Left front, woofer 16, right rear speaker 18, and left 0, γ One of the viewpoints of the present invention is that the right rear channel speaker is composed of a headset-like or a headset-like invitation 2. And the features of the present invention are concentrated on the rear; i ΐ Ξ Ξ i L must pay attention to: the rear channel is put in the first, first, and second configuration of the first machine to provide the user with the device. i two positions, the purpose of which is to generate two ears 2 behind, earphone-like or earphone-like device, device transmission 2 Μ = ί can not receive sound from the front speakers and two sounds. Therefore, the sound from the right rear to the left is transmitted from the front speakers, or the S from the π *, and the left rear channel speakers are located next to the device of the headphone, and the purpose is to produce a virtual speaker. Please refer to FIG. 2. The first system of the earphone structure is to show that the signaU with a similar head of the present invention is provided to the channel signal of the channel of Taiyi Zefang (channel eight, square, front left speaker, and middle

519849 V. Description of the invention (6) The setting signal is provided to the center speaker through a transmission line. Similarly, the subwoofer signal is input to the subwoofer. A low-pass filter (10 w p a s s fs 11 e r: LF) is coupled to the right rear and left rear signals to filter out the high frequency signals, and the low frequency signals are sent to the subwoofer through the filter. Provides a device or means for generating a head related transfer function (HRTF) coupled with the right rear and left rear channel signals to simulate a rear channel virtual speaker. The above HRTF includes a device or means having a delayed signal and a filter. HRTF devices or means can be hardware or software. The device that delays the signal delays the signal transmitted to the right and rear left speakers by coupling with the signals of the right and rear left channels, and the speakers of the right and left rear channels are similar to headphones or headphones. Carried by the structure. This is because the distance from the right rear and left rear speakers to the ear is closer than the distance from other speakers to the ear. Therefore, the virtual speaker device generated at the rear is connected to the device generating the HRTF to determine the delay time, and the delay time is determined according to the distance between the user and the front speaker. The function of generating a virtual speaker device can be performed by hardware or software. A typical delay time is approximately the distance divided by the speed of sound (D / VS) in the air. The above delayed signals processed by HRTF can be provided to the volume controller to

Page 10 519849 V. Description of the invention The volume of the turn. HRTF simulates the sound effect model of the human ear in three-dimensional space. After the sound parameter of each area in each area is determined by its distance, orientation and height, the above signal is provided to a rear speaker. The enlarged rear speakers are carried by a headset-like or headphone-like knot. The signal played by the rear speakers is delayed. The Φ sound Snoopy can simultaneously receive the signals from the rear speakers and the front speakers. And the signal transmitted to the rear channel #speaker can be transmitted by, external line (lnfrared: IR) or radio frequency (radio. Therefore, 'headphones or headphones ... constructs a receiver to receive wireless transmission signals Please refer to FIG. 3, which shows Gu + Shi & Step 30. In the present invention, a rear speaker = structure is provided. And a headset or a headset s ^ t ^ ^,] # ^ , 0 ^ f ^ The signal of the loudspeaker is delayed, and the delay is 2 to the distance between the rear channel speaker and the front speaker. Ί 工 =. Medium, processed by the device that generates HRTF. Then, + Passed to the headphone-like structure with m = middle

519849 V. Description of the invention (8) Sounder. The present invention provides a headphone-like or headphone-like structure such that the user wears it on the head. The headphone-like or headphone-like structure includes a rear speaker therein. Headphone-like or headphone-like structures also include openings for receiving signals from the front speakers. The present invention provides better sound effects without losing rear bass. For those skilled in the art, although the present invention is explained above with a preferred example, it is not intended to limit the spirit of the present invention. Modifications and similar arrangements made without departing from the spirit and scope of the present invention should be included in the scope of patent applications described below, and such scope should be consistent with the broadest interpretation covering all modifications and similar structures. Therefore, clarifying a preferred embodiment of the present invention as described above can be used to identify various changes made without departing from the spirit and scope of the present invention.

519849 Brief description of the drawings Brief description of the drawings: The preferred embodiment of the present invention will be described in more detail in the following description supplemented by the following figures: Figure 1 shows the display of the present invention 5. 1 D Schematic diagram of home theater sound system. Figure 2 shows a system with a headset-like structure according to the present invention. FIG. 3 is a schematic diagram showing a process of the present invention. Symbol comparison table: Sound system 1 0 Front right speaker 1 2 Front left speaker 1 4, Subwoofer 16 Rear right speaker 1 8 Rear left speaker 2 0

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Claims (1)

519849 VI. Scope of patent application Patent scope: 1. A method for playing sound effects, including: providing a headphone or headphone-like device, the device having a rear channel speaker therein, the headphone or the like The device of the earphone includes a through hole for receiving the signal from the front speaker; transmitting the front and rear channels and the subwoofer signal to the relevant speaker; using a head related transfer function determined by the distance between the user and the front speaker function; HRTF) processes and delays the signal passed to the rear channel speaker; and passes the processed signal to the rear channel speaker to generate a rear channel virtual speaker without losing the rear channel bass. 2. The method of playing sound effects according to item 1 of the scope of patent application, wherein the delay time of the delay signal is determined by the distance between the user and the front speaker divided by the speed of sound in the air. 3. A sound effect system comprising: a headphone or headphone-like device having a rear channel speaker therein for providing a user to wear on the head, wherein the headphone or headphone-like device Do not cover the entire ear, so as not to receive sound from the front speakers and subwoofer, the rear channel speakers are located in this type of headphones or Page 14 519849 VI. Both sides of the patent-applicable headphone device to generate the rear channel sound effect; Provide a device that generates a headre 1 ated transfer function (HRTF), which is related to the right Signal coupling of rear and left rear channels; providing a device for generating a rear channel virtual speaker, the rear channel virtual speaker is coupled with the device for generating head-related conversion functions to generate a rear channel virtual speaker, and The signal processed by the device that generates the head-related conversion function is provided to the rear channel speaker in the headset or the headset-like device. Φ 4. The sound effect system according to item 3 of the scope of patent application, wherein the device for generating the head-related conversion function includes a device with a delay signal and a filtering function. 5. The sound effect system according to item 4 of the patent application, wherein the delay time of the delay signal is determined by the distance between the user and the front speaker divided by the speed of sound in the air. ❿ 6. The sound effect system of item 3 of the scope of patent application, further includes a wireless signal transmitter coupled with the device for generating head-related conversion functions and transmitting signals. 7. If the sound effect system of the scope of patent application No. 6 includes a Page 15 519849 VI. Scope of patent application The wireless signal receiver in this type of headset or similar headset device, to receive the transmitted signal. 〇 Φ Page 16