Playback device and playback method

Abstract

The present invention discloses a playback device and a playback method, which can play images and / or sounds according to the distance measurement result. The playback device has a wireless communication function and can establish a wireless connection with a portable device. The playback device is used to obtain a received signal strength index of the portable device according to the wireless signal of the portable device, and then calculate the estimated distance between the playback device and the portable device according to the received signal strength index to obtain the distance measurement result, and then determine at least one playback parameter of the playback device, such as brightness or volume, according to the distance measurement result.

Description

Technical Field

[0001] The present invention relates to a playback device and a playback method, and in particular to a playback device and a playback method capable of playing images and / or sounds according to distance measurement results. Background Art

[0002] When a user uses a smart device (e.g., a smart TV or smart speaker), the distance between the user and the smart device may change due to factors such as walking or changing seats. After the distance changes, if the user wants to get a better user experience, the user generally needs to use a remote control or voice recognition to adjust the parameters of the smart device (e.g., brightness and / or volume). However, the control method of the traditional remote control is cumbersome, and the voice recognition method may have problems such as low recognition rate, extended response time, and unstable network signal, which will reduce the user experience.

[0003] In addition, users may forget to turn off their smart devices when they leave, resulting in a waste of power. Summary of the invention

[0004] One of the purposes of the present disclosure is to provide a playback device and a playback method to avoid the problems of the prior art.

[0005] An embodiment of the playback device disclosed in the present invention is capable of playing images and / or sounds based on the distance measurement result. The playback device of this embodiment has a wireless communication function and can establish a wireless connection with a portable device. After establishing the wireless connection, the playback device obtains the received signal strength index (RSSI) of the portable device based on the wireless signal of the portable device, and then calculates the estimated distance between the playback device and the portable device based on the RSSI to obtain the distance measurement result, and then determines at least one playback parameter of the playback device based on the distance measurement result, such as brightness and / or volume.

[0006] An embodiment of the playback method disclosed herein can play images and / or sounds based on the distance measurement result. The playback method of this embodiment is executed by a playback device, and the playback device has a wireless communication function. The playback method of this embodiment includes the following steps: establishing a wireless connection with a portable device to receive a wireless signal of the portable device; obtaining a received signal strength index (RSSI) of the portable device based on the wireless signal; calculating an estimated distance between the playback device and the portable device based on the RSSI to obtain the distance measurement result; and determining at least one playback parameter of the playback device based on the distance measurement result.

[0007] The features, implementations and effects of the present invention will be described in detail as follows with reference to the accompanying drawings and in conjunction with embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 An embodiment of a playback device disclosed in the present invention is shown;

[0009] Figure 2 Shows Figure 1 The list stored in the playback device includes the distance records and standard deviations of the portable device;

[0010] Figure 3 A flow chart showing one embodiment of operations performed by a playback device; and

[0011] Figure 4 An embodiment of the playback method disclosed in the present invention is shown. DETAILED DESCRIPTION

[0012] The present disclosure discloses a playback device and method, which can play images and / or sounds according to distance measurement results.

[0013] Figure 1 An embodiment of a playback device disclosed in the present invention is shown. Figure 1 The playback device 100 has a wireless communication function and can establish a wireless connection with the portable device 10. After establishing the wireless connection, the playback device 100 obtains the received signal strength index (RSSI) of the portable device 10 according to the wireless signal of the portable device 10; then the playback device 100 calculates the estimated distance between the playback device 100 and the portable device 10 according to the RSSI to obtain a distance measurement result; then the playback device 100 determines at least one playback parameter of the playback device 100 according to the distance measurement result. For example, the at least one playback parameter includes at least one of the following: at least one image parameter (e.g., brightness, backlight, contrast, sharpness, tints, tones, shades, color temperature); and at least one sound parameter (e.g., volume, bass, treble, balance, echo). The at least one playback parameter can be a default parameter combination or a user-set parameter combination.

[0014] Please refer to Figure 1In an example implementation, the wireless communication function is a Bluetooth low energy communication function; the playback device 100 acts as a central device; and the portable device 10 acts as a peripheral device; the playback device 100 and the portable device 10 transmit packets based on the connection. The packets comply with the Generic Access Profile (GAP), and the wireless connection complies with the Generic Attribute Profile (GATT).

[0015] Please refer to Figure 1 . In an example implementation, if the wireless connection is the first connection between the playback device 100 and the portable device 10, the playback device 100 may request the user of the portable device 10 to change the distance between the playback device 100 and the portable device 10 by means of image display or sound playback, thereby implementing the following operations: when the estimated distance is a first distance (e.g., 1 meter), the playback device 100 records the reference strength of the wireless signal; when the estimated distance is a second distance (e.g., 0.5 meters), the playback device 100 calculates an environmental attenuation factor (EAF) based on the RSSI and the reference strength, wherein the first distance is generally a preset distance, and the second distance is different from the first distance; and when the estimated distance is different from the first distance and the second distance, the playback device 100 calculates the estimated distance based on the RSSI, the reference strength, and the environmental attenuation factor. Since the calculation of the strength of the wireless signal and the calculation of the RSSI are both common techniques in the art, the details are omitted here. In addition, the environmental attenuation factor can be calculated using the following formula 1:

[0016]

[0017] In the above formula, “d” represents the distance between the playback device 100 and the portable device 10 , “A” represents the reference intensity, and “n” represents the environmental attenuation factor.

[0018] Please refer to Figure 1 In an example implementation, the playback device 100 calculates the estimated distance periodically (e.g., every 0.5 seconds) or non-periodically (e.g., triggered by any user instruction) to store the estimated distance data. When the estimated distance (i.e., the latest value of the estimated distance) falls within a first range (e.g., 0 to 70 cm, Figure 1), the playback device 100 adopts the first setting (e.g., the eye protection setting of the TV and / or the volume reduction setting of the speaker) to determine the at least one playback parameter (e.g., the brightness parameter and / or the volume parameter); when the estimated distance (i.e., the latest value of the estimated distance) falls within the second range (e.g., 71 to 500 cm, as shown in the small circle dashed line of ... Figure 1 When the playback device 100 is within the range of the large circle dashed line, the playback device 100 adopts the second setting (for example, the initial setting of the TV and / or the initial setting of the volume of the speaker) to determine the at least one playback parameter; the first setting is different from the second setting. An embodiment of the above parameter adjustment is calculated by the following formula 2:

[0019]

[0020] In the above formula, “V d " is an adjusted parameter (e.g., an adjusted volume parameter), "d" is a distance between the playback device 100 and the portable device 10, "D" is a preset distance (e.g., an upper limit of the first range), and "V0" is an initial parameter (e.g., an initial volume parameter) corresponding to the preset distance "D". Those skilled in the art may determine other distance ranges and their corresponding settings based on the above description and implementation requirements.

[0021] Please refer to Figure 1 In an example implementation, when the estimated distance is greater than an upper distance limit (eg, 500 cm), the playback device 100 stops determining the at least one playback parameter based on the distance measurement result; in other words, the playback device 100 no longer refers to the change in the estimated distance to determine the at least one playback parameter. In another example implementation, the playback device 100 can be connected to one of multiple candidate portable devices, and the portable device 10 is one of the multiple candidate portable devices; after the estimated distance is greater than the upper limit of the distance, the playback device 100 determines whether the distance between any candidate portable device and the playback device 100 is not greater than the upper limit of the distance through the aforementioned Generic Access Profile (GAP); if the playback device 100 determines that the distance between a candidate portable device and the playback device 100 is less than the upper limit of the distance, the playback device 100 first establishes a wireless connection with the candidate portable device through the aforementioned Generic Attribute Profile (GATT), and then determines the at least one playback parameter based on the distance between the playback device 100 and the candidate portable device; if the playback device 100 determines that the distance between any candidate portable device and the playback device 100 is less than the upper limit of the distance, the playback device 100 enters a sleep mode, or the playback device 100 shuts down after entering the sleep mode for a predetermined time, or the playback device 100 shuts down directly.

[0022] Please refer to Figure 1 . In an example implementation, the playback device 100 calculates the estimated distance at multiple time points to store multiple (for example, 10) records of the estimated distance, and then calculates the standard deviation based on the multiple records; when the standard deviation is the largest of the multiple standard deviations, the playback device 100 regards the portable device 10 as the active device, and determines the at least one playback parameter of the active device based on the distance measurement result. In the above example, each of the multiple standard deviations represents the standard deviation of multiple records of the distance between the playback device 100 and the candidate portable devices; to be more specific, the playback device 100 can be connected to multiple candidate portable devices at different times, and obtain multiple (for example, 10) records of the distance between the playback device 100 and each candidate portable device and their standard deviations, and then select one of the candidate portable devices as the active device based on the standard deviation of the candidate portable devices. The active device Figure 1 denoted by the portable device 10. The standard deviation can be calculated using the following formula 3:

[0023]

[0024] In the above formula, N is the number of records associated with each candidate portable device (eg, 10). It is worth noting that the playback device 100 can store the distance records and standard deviations of these candidate portable devices in a list. An example of the list is Figure 2 As shown, device 1, device 2, ... and device K are indexes of these candidate portable devices, SD1, SD2, ... and SD K They represent the standard deviations of device 1, device 2, ... and device K, and D10, D11, ... and D1 N N distance records representing device 1, D20, D21, ... and D2 N represents the N distance records of device 2, and DK0, DK1, ... and DKN represent the N distance records of device K.

[0025] Figure 3 A flow chart of an embodiment of the operations performed by the playback device 100 is shown. Figure 3 It includes the following steps:

[0026] S310: The process starts.

[0027] S320: Connecting to a candidate portable device for the first time In this step, the playback device 100 connects to a candidate portable device for the first time and calculates the signal strength (eg, the aforementioned reference strength) and the environmental attenuation factor of the candidate portable device.

[0028] S330: Determine whether any device is not connected; if so, go to step S335; if not, go to step S340.

[0029] S335: The process ends.

[0030] S340: Calculate the RSSI and estimated distance of the connected device. The connected device is the only candidate portable device or one of a plurality of candidate portable devices.

[0031] S350: updating the distance record of the connected device according to the estimated distance in step S340.

[0032] S360: Calculate the standard deviation of each candidate portable device according to the multiple distance records of the device, and then select an active device according to the standard deviation of the candidate portable device / devices and connect with the active device / devices.

[0033] S370: Determine which of multiple ranges the estimated distance between the active device and the playback device 100 falls within, to obtain a distance measurement result.

[0034] S372: When the distance measurement result indicates that the estimated distance falls within the first range, a first setting (e.g., an eye protection setting of the TV and / or a volume reduction setting of the speaker) is adopted to determine at least one playback parameter (e.g., a brightness parameter and / or a volume parameter) of the playback device 100.

[0035] S374: When the distance measurement result indicates that the estimated distance falls within the second range, a second setting (e.g., an initial setting of the TV and / or an initial setting of the volume of the speaker) is used to determine at least one playback parameter (e.g., a brightness parameter and / or a volume parameter) of the playback device 100.

[0036] S376: When the distance measurement result indicates that the estimated distance is greater than the upper limit of the distance, the playback device 100 determines whether there are other candidate portable devices whose distances to the playback device 100 are not greater than the upper limit of the distance; if so, go to step S330; if not, go to step S380. It is worth noting that in this step, the other candidate portable devices are devices that the playback device 100 has been connected to (for example, Figure 2 At least one of device 1, device 2, ... and device K).

[0037] S380: The playback device 100 enters a sleep mode or shuts down.

[0038] Since ordinary technicians in this field can refer to the description of the previous paragraphs to understand Figure 3 The details and variations of the embodiments of the present invention are described in detail, and repeated and redundant descriptions are omitted here.

[0039] Figure 4An embodiment of the playback method disclosed in the present invention is shown. Figure 4 The embodiment is executed by a playback device, which can play images and / or sounds according to the distance measurement results, wherein the playback device has a wireless communication function. Figure 4 The embodiment comprises the following steps:

[0040] S410: Establishing a wireless connection with a portable device to receive a wireless signal from the portable device.

[0041] S420: Obtain a received signal strength index (RSSI) of the portable device according to the wireless signal.

[0042] S430: Calculate the estimated distance between the playback device and the portable device according to the RSSI to obtain the distance measurement result.

[0043] S440: Determine at least one playback parameter of the playback device according to the distance measurement result.

[0044] Since ordinary technicians in this field can refer to Figures 1 to 3 The disclosure of the embodiments of the present invention is to understand Figure 4 Details and variations of the embodiments of Figures 1 to 3 The technical features of the embodiments can be reasonably applied to Figure 4 In the embodiments of the present invention, repeated and redundant descriptions are omitted here.

[0045] Please note that, under the premise of being implementable, a person of ordinary skill in the art may selectively implement part or all of the technical features in any of the aforementioned embodiments, or selectively implement a combination of part or all of the technical features in the aforementioned multiple embodiments, thereby increasing the flexibility of the implementation of the present invention.

[0046] In summary, the playback device and method disclosed in the present invention can play images and / or sounds according to the distance measurement result, thereby avoiding the problems of the prior art.

[0047] Although the embodiments of the present invention are described above, these embodiments are not intended to limit the present invention. A person skilled in the art may make changes to the technical features of the present invention according to the explicit or implicit contents of the present invention. All these changes may fall within the scope of patent protection sought by the present invention. In other words, the scope of patent protection of the present invention shall be subject to that defined in the claims of this specification.

[0048]

Explanation of symbols

[0049] 100: Playback device

[0050] 10: Portable Devices

[0051] SD1~SD K : Standard deviation

[0052] D10~D1 N :N distance records of device 1

[0053] D20~D2 N :N distance records of device 2

[0054] DK0~DKN: N distance records of device K

[0055] S310~S380: Steps

[0056] S410~S440: Steps

Claims

1. A playback device capable of playing images and / or sounds according to the distance measurement result, the playback device having a wireless communication function, wherein: The playback device is used to establish a wireless connection with a portable device, and then obtain a received signal strength indicator RSSI of the portable device according to a wireless signal of the portable device, and then calculate an estimated distance between the playback device and the portable device according to the RSSI to obtain the distance measurement result, and then determine at least one playback parameter of the playback device according to the distance measurement result; wherein the playback device calculates the estimated distance at multiple time points to store multiple records of the estimated distance, and then calculates the standard deviation based on the multiple records; In a case where the standard deviation is the largest of the plurality of standard deviations, the playback device regards the portable device as an active device, and determines the at least one playback parameter of the playback device according to the distance measurement result; The portable device is one of a plurality of candidate portable devices, and each of the plurality of standard deviations represents a standard deviation of a plurality of records of distances between the playback device and a candidate portable device among the plurality of candidate portable devices. 2 . The playback device according to claim 1 , wherein the playback device is a television, and the at least one playback parameter comprises at least one of the following: at least one image parameter; and at least one sound parameter.

3. The playback device according to claim 1, wherein the wireless communication function is a Bluetooth low energy communication function, the playback device acts as a peripheral device, and establishes the wireless connection with the portable device by sending an advertising packet; the advertising packet complies with a general access specification; the wireless connection complies with a general attribute specification; under the general attribute specification, when the peripheral device is connected to the portable device, it cannot be connected to other devices.

4. The playback device according to claim 1, wherein when the estimated distance is a first distance, the playback device records a reference strength of the wireless signal; when the estimated distance is a second distance, the playback device calculates an environmental attenuation factor based on the RSSI and the reference strength; the first distance is different from the second distance; when the estimated distance is different from the first distance and different from the second distance, the playback device calculates the estimated distance based on the RSSI, the reference strength and the environmental attenuation factor. 5 . The playback device according to claim 1 , wherein the playback device calculates the estimated distance periodically or aperiodically to store data of the estimated distance.

6. The playback device according to claim 1, wherein when the estimated distance falls within a first range, the playback device adopts a first setting to determine the at least one playback parameter; when the estimated distance falls within a second range, the playback device adopts a second setting to determine the at least one playback parameter; the first setting is different from the second setting. 7 . The playback device according to claim 6 , wherein when the estimated distance is greater than an upper distance limit, the playback device stops determining the at least one playback parameter based on the distance measurement result.

8. The playback device according to claim 7, wherein when the estimated distance is greater than the upper distance limit, the playback device determines whether the distance between any candidate portable device and the playback device is not greater than the upper distance limit; if the playback device determines that the distance between a candidate portable device and the playback device is less than the upper distance limit, the playback device determines the at least one playback parameter based on the distance between the candidate portable device and the playback device.

9. The playback device according to claim 7, wherein after the estimated distance is greater than the upper distance limit, the playback device enters a sleep mode or shuts down.

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