CN111965655A - Multimedia system applying time-of-flight ranging and operation method thereof - Google Patents
Multimedia system applying time-of-flight ranging and operation method thereof Download PDFInfo
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- CN111965655A CN111965655A CN202010041733.5A CN202010041733A CN111965655A CN 111965655 A CN111965655 A CN 111965655A CN 202010041733 A CN202010041733 A CN 202010041733A CN 111965655 A CN111965655 A CN 111965655A
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- 238000000034 method Methods 0.000 title claims abstract description 22
- 238000004891 communication Methods 0.000 claims abstract description 23
- 238000012545 processing Methods 0.000 claims abstract description 15
- 230000005540 biological transmission Effects 0.000 claims description 21
- 230000003287 optical effect Effects 0.000 claims description 19
- 230000003190 augmentative effect Effects 0.000 claims description 7
- 238000011017 operating method Methods 0.000 claims description 7
- 238000012163 sequencing technique Methods 0.000 claims description 4
- 238000010586 diagram Methods 0.000 description 7
- 230000000737 periodic effect Effects 0.000 description 4
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N25/00—Circuitry of solid-state image sensors [SSIS]; Control thereof
- H04N25/70—SSIS architectures; Circuits associated therewith
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S17/00—Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
- G01S17/02—Systems using the reflection of electromagnetic waves other than radio waves
- G01S17/06—Systems determining position data of a target
- G01S17/08—Systems determining position data of a target for measuring distance only
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N25/00—Circuitry of solid-state image sensors [SSIS]; Control thereof
- H04N25/70—SSIS architectures; Circuits associated therewith
- H04N25/71—Charge-coupled device [CCD] sensors; Charge-transfer registers specially adapted for CCD sensors
- H04N25/75—Circuitry for providing, modifying or processing image signals from the pixel array
Abstract
The invention provides a multimedia system applying time-of-flight ranging and an operation method thereof. The multimedia system includes a plurality of electronic devices. The electronic devices respectively comprise a processing module, a time-of-flight ranging module and a communication module. The time-of-flight ranging module is used for executing time-of-flight ranging operation. The communication module is used for carrying out wireless communication. The electronic devices communicate via respective communication modules to formulate an operating protocol and respective unique identifiers, and to synchronize time slots (time slots) between the different electronic devices. The plurality of electronic devices sequentially perform a time-of-flight ranging operation according to respective unique identifiers.
Description
Technical Field
The present invention relates to a ranging technique, and more particularly, to a multimedia system using Time-of-Flight (ToF) ranging and an operating method thereof.
Background
In a Virtual Reality (VR) system, an Augmented Reality (AR) system, or other multimedia system, which generally includes a plurality of wearable electronic devices for performing interactive operations, distance information between the wearable electronic devices is obtained by respectively transmitting positioning data back to a main control server for analysis and calculation, and then the main control server transmits corresponding distance information back to the wearable electronic devices respectively. In contrast, the acquisition of the distance information between the wearable electronic devices requires a lot of data calculation time and data transmission time, which easily causes delay in the interactive operation process and continuously occupies a part of the calculation resources of the main control server. In view of this, several embodiments of solutions will be presented below.
Disclosure of Invention
The invention aims at a multimedia system applying time-of-flight ranging and an operation method thereof, which can ensure that each of a plurality of electronic devices in the multimedia system can effectively perform the time-of-flight ranging function.
According to an embodiment of the present invention, a multimedia system applying time-of-flight ranging of the present invention includes a plurality of electronic devices. The electronic devices respectively comprise a processing module, a time-of-flight ranging module and a communication module. The time-of-flight ranging module is coupled to the processing module and is used for executing time-of-flight ranging operation. The communication module is coupled to the processing module and is used for performing wireless communication. The electronic devices communicate via respective communication modules to formulate an operating protocol and respective unique identifiers, and to synchronize time slots (time slots) between the different electronic devices. The plurality of electronic devices sequentially perform the time-of-flight ranging operations through respective time-of-flight ranging modules according to the operating protocol and respective unique identifiers.
In a multimedia system according to an embodiment of the present invention, the operating protocol includes a sequencing of a plurality of time-of-flight ranging periods of the plurality of electronic devices, and the plurality of time-of-flight ranging periods do not overlap with each other.
In the multimedia system according to the embodiment of the invention, the time-of-flight ranging module of each of the plurality of electronic devices performs the time-of-flight ranging operation through an indirect time-of-flight ranging method. The length of an operation period of each of the plurality of electronic devices performing the time-of-flight ranging operation is greater than the length of an indirect time-of-flight ranging period. The time length of one indirect time-of-flight ranging period is equal to the sum of the time length of one light sensing and the time length of one data transmission. The one light sensing time length is longer than the one data transmission time length.
In the multimedia system according to the embodiment of the invention, the respective time-of-flight ranging modules of the plurality of electronic devices perform the time-of-flight ranging operation through a direct time-of-flight ranging method. The length of an operation period of each of the plurality of electronic devices performing the time-of-flight ranging operation is equal to the length of a direct time-of-flight ranging period. The time length of one direct time-of-flight ranging period is equal to the sum of the time length of one light sensing and the time length of one data transmission. The one light sensing time length is shorter than the one data transmission time length.
In the multimedia system according to the embodiment of the present invention, the multimedia system is a virtual reality system or an augmented reality system.
According to an embodiment of the invention, the method of operation of a multimedia system applying time-of-flight ranging of the invention comprises the following steps: communicating by a plurality of electronic devices via respective communication modules to formulate an operating protocol and respective unique identifiers, and synchronizing time slots between different electronic devices; and sequentially performing, by the plurality of electronic devices, a time-of-flight ranging operation via respective time-of-flight ranging modules according to an operating protocol and the respective unique identifier.
Based on the above, the operating method of the multimedia system applying the time-of-flight ranging of the present invention can enable the plurality of electronic devices in the multimedia system to perform the time-of-flight ranging sequentially without signal collision and erroneous determination.
In order to make the aforementioned and other features and advantages of the invention more comprehensible, embodiments accompanied with figures are described in detail below.
Drawings
The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification. The drawings illustrate embodiments of the invention and together with the description serve to explain the principles of the invention.
FIG. 1 is a diagram of an electronic device according to an embodiment of the invention;
FIG. 2 is a diagram of a multimedia system according to an embodiment of the invention;
FIG. 3 is a timing diagram of Indirect Time-of-Flight (I-ToF) signals according to an embodiment of the present invention;
FIG. 4 is a timing diagram of Direct Time-of-Flight (D-ToF) signals according to an embodiment of the present invention;
fig. 5 is a flowchart illustrating an operating method of a multimedia system according to an embodiment of the invention.
Description of the reference numerals
100. 210-240: an electronic device;
110: a processing module;
120: a time-of-flight ranging module;
130: a communication module;
200: a multimedia system;
201-205: sensing light;
PA, PB, P0, P1, PA ', PB', P0 ', P1': a length of time;
I-ToF, D-ToF, T1, T2, T3, T4, T1 ', T2', T3 ', T4': time sequence;
s510, S520: and (5) carrying out the following steps.
Detailed Description
Reference will now be made in detail to exemplary embodiments of the invention, examples of which are illustrated in the accompanying drawings. Wherever possible, the same reference numbers will be used throughout the drawings and the description to refer to the same or like parts.
Fig. 1 is a schematic view of an electronic device according to an embodiment of the invention. Referring to fig. 1, an electronic device 100 includes a processing module 110, a Time-of-Flight (ToF) module 120, and a communication module 130. Processing module 110 is coupled to time-of-flight ranging module 120 and communication module 130. In this embodiment, the electronic device 100 may first communicate with another electronic device through the communication module 130 to establish an operation Protocol (Protocol) and a Unique Identifier (UID) of each electronic device, and synchronize time slots (time slots) between different electronic devices. The unique identifier is used to identify the identity of the electronic device 100, and the operating protocol includes a ranking of a plurality of Time-of-flight ranging periods (Time slots) based on different unique identifiers. Therefore, in the present embodiment, the processing module 110 of the electronic device 100 can then determine the sequence of the femto-interval corresponding to its own unique identifier in the operating protocol according to the operating protocol and the respective unique identifier, so as to determine the time for the femto-module 120 to perform femto-ranging.
In the embodiment, the Processing module 110 may include, for example, a Central Processing Unit (CPU), or other Programmable general purpose or special purpose Microprocessor (Microprocessor), a Digital Signal Processor (DSP), a Programmable controller, an Application Specific Integrated Circuit (ASIC), a Programmable Logic Device (PLD), other similar Processing devices, or a combination thereof. In the present embodiment, the communication module 130 is a wireless communication module, such as a WiFi module.
Fig. 2 is a schematic diagram of a multimedia system according to an embodiment of the invention. Referring to fig. 2, the multimedia system 200 may be, for example, a Virtual Reality (VR) system or an Augmented Reality (AR) system, etc., and the present invention is not limited thereto. The multimedia system 200 may include a plurality of electronic devices 210-240, and the electronic devices 210-240 operate in the same virtual reality application or the same augmented reality application for interactive operation. In the embodiment, the electronic devices 210-240 can be wearable electronic devices, for example. The electronic devices 210-240 may respectively include a display module of virtual reality or augmented reality and related control circuits, and further respectively include a plurality of modules in the electronic device 100 of the embodiment of fig. 1.
In the embodiment, the electronic devices 210-240 can communicate through respective communication modules to establish an operation protocol and respective unique identifiers. The unique identifiers are used to identify each other, and the operating protocol includes a sequencing of a plurality of time-of-flight ranging periods based on the different unique identifiers. Therefore, the processing modules 110 of the electronic devices 210-240 can then determine the sequence of the time-of-flight ranging periods corresponding to their unique identifiers in the operating protocol according to the operating protocol and the respective unique identifiers, so as to determine the time for performing the time-of-flight ranging.
For example, as shown in FIG. 2, the electronic devices 210-240 have established an order for sequentially performing time-of-flight ranging. Therefore, the time-of-flight ranging module of the electronic device 210 first transmits the sensing light 201 to the wearer of the electronic device 220 facing the current direction, and receives the reflected light correspondingly transmitted back, so as to obtain the distance between the wearer of the electronic device 210 and the wearer of the electronic device 220 through calculation. By analogy, the time-of-flight ranging module of the electronic device 220 then transmits the sensing light 202 to the wearer of the currently oriented electronic device 230 for ranging. The time-of-flight ranging module of the electronic device 230 then transmits the sensing light 203 to the wearer of the currently oriented electronic device 220 for ranging. The time-of-flight ranging module of the electronic device 240 then transmits the sensing light 204 to the wearer of the currently oriented electronic device 220 for ranging. Since the electronic devices 210-240 can continuously and repeatedly perform ranging in sequence, the time-of-flight ranging module of the electronic device 210 performs ranging again according to the sequencing of the ranging periods of the operation protocol to transmit the sensing light 205 to the wearer of the electronic device 240 facing the current direction (the wearer of the electronic device 210 may turn around) to obtain the current distance between the wearer of the electronic device 210 and the wearer of the electronic device 240.
Accordingly, the electronic devices 210-240 of the multimedia system 200 of the embodiment can effectively and quickly obtain the distance therebetween, and can also upload the distance information to each other or the main control server through the communication module, so that the application operation in progress can obtain the distance information between the electronic devices 210-240 in real time to perform the corresponding operation.
FIG. 3 is a timing diagram of Indirect Time-of-Flight (I-ToF) according to an embodiment of the present invention. Referring to fig. 2 and 3, the timing sequence I-ToF represents a timing sequence of the periodic ranging operation performed by the single time-of-flight ranging module. According to the timing I-ToF, the time length P0 of an indirect time-of-flight ranging period is equal to the sum of the time length PA of an optical sensing (oblique line) and the time length PB of a data transmission (non-oblique line). In this embodiment, the time length PA of the light sensing means the time difference between the time when the light emitting unit in the time-of-flight ranging module emits the sensing light and the time when the light sensing unit in the time-of-flight ranging module receives the corresponding reflected light. The data transmission time PB refers to a time length of an Analog-to-Digital Converter (ADC) circuit in the time-of-flight ranging module outputting the distance data. In the present embodiment, the timings T1-T4 are timings corresponding to the periodic ranging operations performed by the time-of-flight ranging modules of the electronic devices 210-240, respectively.
In this regard, the time-of-flight ranging modules of the electronic devices 210-240 perform the time-of-flight ranging operation by an indirect time-of-flight ranging method. The indirect time-of-flight ranging method is to calculate the phase difference between the waveform of the sensing light and the waveform of the reflected light to convert the distance, so that the time required for response is longer, and the time length PA of the one light sensing is longer than the time length PB of the one data transmission. In other words, since the time length PA of the one optical sensing is greater than the time length PB of the one data transmission, the length P1 of one operation period of the electronic devices 210-240 performing the fly-time ranging operation respectively is inevitably greater than the length P0 of one indirect fly-time ranging period.
Specifically, referring to the timing sequences T1-T4, the electronic device 220 needs to wait for the optical sensing of the electronic device 210 to be finished before continuing the optical sensing. By analogy, after the optical sensing of the electronic device 240 is finished, the electronic device 210 may perform the optical sensing of the next round again. That is, the electronic devices 210-240 can sequentially perform ranging according to the indirect time-of-flight ranging method, but the Refresh Rate (Refresh Rate) will decrease. In addition, the sequence of the time-of-flight ranging periods mentioned above refers to the sequence of the respective light sensing periods (oblique lines) in the timings T1 to T4.
FIG. 4 is a signal timing diagram of Direct Time-of-Flight (D-ToF) ranging according to an embodiment of the present invention. Referring to fig. 2 and 4, the timing sequence D-ToF represents a timing sequence of the periodic ranging operation performed by the single time-of-flight ranging module. According to the timing sequence D-ToF, the time length P0 ' of a direct time-of-flight ranging period is equal to the sum of the time length PA ' (oblique lines) of one photo sensing and the time length PB ' (non-oblique lines) of one data transmission. In this embodiment, the time duration PA' of the light sensing refers to the time duration of the time difference between the time when the light emitting unit in the time-of-flight ranging module emits the sensing light and the time when the light sensing unit in the time-of-flight ranging module receives the corresponding reflected light. The data transmission time period PB' refers to the time period for the analog-to-digital converter circuit in the time-of-flight ranging module to output the distance data. In the present embodiment, the timings T1 'T4' respectively correspond to the timings of the periodic ranging operations performed by the time-of-flight ranging modules of the electronic devices 210-240.
In this regard, the time-of-flight ranging modules of the electronic devices 210-240 are used for performing time-of-flight ranging operations by direct time-of-flight ranging. The direct time-of-flight ranging method converts the distance by calculating the time difference between the emission of the sensing light and the reception of the reflected light, so that the response thereof is fast, and the time length PB 'of the one data transmission is longer than the time length PA' of the one light sensing. In other words, since the time length PA 'of the one optical sensing is much shorter than the time length PB' of the one data transmission, the time length P1 'of one operation period when the electronic devices 210-240 respectively perform the fly-time ranging operation may be equal to the time length P0' of one direct fly-time ranging period.
Specifically, referring to the timing sequences T1 'to T4', the electronic device 220 needs to wait for the end of the optical sensing of the electronic device 210 before proceeding the optical sensing. In this way, after the optical sensing of the electronic device 240 is finished, the electronic device 210 can just finish outputting the distance data without waiting for directly continuing the optical sensing of the next round. That is, the electronic devices 210-240 can sequentially perform ranging according to the direct time-of-flight ranging method, but the updating frequency is not reduced compared to the embodiment of fig. 3. The sequence of the time-of-flight ranging periods described above refers to the sequence of the respective light sensing periods (diagonal lines) in the timings T1 'to T4'.
Fig. 5 is a flowchart illustrating an operating method of a multimedia system according to an embodiment of the invention. Referring to fig. 2 and fig. 5, the operation method of the embodiment can be applied to the multimedia system 200 of fig. 2. In step S510, the electronic devices 210-240 communicate via respective communication modules to formulate an operation protocol and respective unique identifiers, and synchronize time slots (time slots) between different electronic devices. In step S520, the electronic devices 210-240 sequentially perform the time-of-flight ranging operations through the respective time-of-flight ranging modules according to the operation protocol and the respective unique identifiers. Therefore, the operation method of the present embodiment can enable the plurality of electronic devices 210-240 in the multimedia system 200 to perform time-of-flight ranging in sequence without signal collision or erroneous determination.
In addition, other component features, implementation details and technical features of the multimedia system 200 and the electronic devices 210 to 240 of the present embodiment can be obtained by referring to the descriptions of the embodiments of fig. 1 to 4 to obtain sufficient teaching, suggestion and implementation descriptions, and thus, the description thereof is omitted.
In summary, the multimedia system and the operating method thereof applying the time-of-flight ranging of the present invention can provide an effective and real-time ranging function by the time-of-flight ranging, and the multimedia system and the operating method thereof of the present invention can enable a plurality of electronic devices in the multimedia system to communicate via the communication module first to formulate an operation protocol and respective unique identifiers, and then sequentially perform the time-of-flight ranging respectively without signal collision and erroneous judgment.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. A multimedia system employing time-of-flight ranging, comprising:
a plurality of electronic devices, each comprising:
a processing module;
a time-of-flight ranging module coupled to the processing module and configured to perform a time-of-flight ranging operation; and
a communication module coupled to the processing module and configured to perform wireless communication,
wherein the plurality of electronic devices communicate via respective communication modules to formulate an operating protocol and respective unique identifiers and synchronize time periods between different electronic devices, and the plurality of electronic devices sequentially perform the time-of-flight ranging operations via respective time-of-flight ranging modules according to the operating protocol and respective unique identifiers.
2. The multimedia system of claim 1, wherein the operating protocol comprises a sequencing of a plurality of time-of-flight ranging periods for the plurality of electronic devices, and wherein the plurality of time-of-flight ranging periods do not overlap with each other.
3. The multimedia system of claim 1, wherein the time-of-flight ranging module of each of the plurality of electronic devices performs the time-of-flight ranging operation by an indirect time-of-flight ranging method, and a length of one operation cycle of each of the plurality of electronic devices performing the time-of-flight ranging operation is greater than a length of one indirect time-of-flight ranging cycle, wherein the length of one indirect time-of-flight ranging cycle is equal to a sum of a length of one optical sensing and a length of one data transmission, and the length of one optical sensing is greater than the length of one data transmission.
4. The multimedia system of claim 1, wherein the time-of-flight ranging module of each of the plurality of electronic devices performs the time-of-flight ranging operation by direct time-of-flight ranging, and wherein a length of one operation cycle of each of the plurality of electronic devices performing the time-of-flight ranging operation is equal to a length of one direct time-of-flight ranging cycle, wherein the length of one direct time-of-flight ranging cycle is equal to a sum of a length of one optical sensing and a length of one data transmission, and wherein the length of one optical sensing is less than the length of one data transmission.
5. The multimedia system of claim 1, wherein the multimedia system is a virtual reality system or an augmented reality system.
6. A method of operating a multimedia system employing time-of-flight ranging, comprising:
communicating through a respective communication module by a plurality of electronic devices to formulate an operating protocol and respective unique identifiers, and synchronizing time periods between different electronic devices; and
sequentially performing, by the plurality of electronic devices, a time-of-flight ranging operation via respective time-of-flight ranging modules in accordance with the operating protocol and the respective unique identifiers.
7. The method of operation of claim 6, wherein the operating protocol comprises an ordering of a plurality of time-of-flight ranging periods for the plurality of electronic devices, and wherein the plurality of time-of-flight ranging periods do not overlap with each other.
8. The method of claim 6, wherein the time-of-flight ranging module of each of the plurality of electronic devices performs the time-of-flight ranging operation by an indirect time-of-flight ranging method, and a length of one operation cycle of each of the plurality of electronic devices performing the time-of-flight ranging operation is greater than a length of one indirect time-of-flight ranging cycle, wherein the length of one indirect time-of-flight ranging cycle is equal to a sum of a length of one optical sensing and a length of one data transmission, and the length of one optical sensing is greater than the length of one data transmission.
9. The method of claim 6, wherein the time-of-flight ranging module of each of the plurality of electronic devices performs the time-of-flight ranging operation by direct time-of-flight ranging, and wherein a length of one operation cycle of each of the plurality of electronic devices performing the time-of-flight ranging operation is equal to a length of one direct time-of-flight ranging cycle, wherein the length of one direct time-of-flight ranging cycle is equal to a sum of a length of one optical sensing and a length of one data transmission, and wherein the length of one optical sensing is less than the length of one data transmission.
10. The operating method according to claim 6, wherein the multimedia system is a virtual reality system or an augmented reality system.
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| TW202101968A (en) | 2021-01-01 |
| TWI745852B (en) | 2021-11-11 |
| TW202041884A (en) | 2020-11-16 |
| CN111885322B (en) | 2022-11-22 |
| TWI723743B (en) | 2021-04-01 |
| TWI732424B (en) | 2021-07-01 |
| CN111885322A (en) | 2020-11-03 |
| TW202041881A (en) | 2020-11-16 |
| CN111965656A (en) | 2020-11-20 |
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