Mitsubishi Electric Corporation

Keiichi Shirasuka

Soichiro Matsumoto

Kazuya Takaki

Daiki Matsuura

Aki Kimura

Tadashi Sakaguchi

Kensaku Saitoh

Minoru Sota

An information processing device includes a reception I/F unit, a reception-time-point measuring unit, and an event-detection-time-point estimation unit. The event-detection-time-point estimation unit estimates an event detection time point, which is a time point at which an event corresponding to latest detection data is detected, from a minimum system delay time, a minimum-system-delay jitter, and a time period from detection of the event corresponding to a target data to detection of the event corresponding to latest detection data. The minimum-system-delay jitter is the difference between a minimum-reception-time expected reception time point and the reception time point of the target detection data. The minimum-reception-time expected reception time point is calculated to be a time point at which the target data is received before the latest detection data. The target detection data is one piece of detection data, out of the multiple pieces of detection data, sent with a minimum system delay time.

Information processing device, non-transitory computer-readable storage medium, and information processing method

A data reception unit as the receiver is a device for estimating an event detection time point and includes: a reception-time-point measurement unit that measures a reception time point when reception is made by a reception I/F unit; a reception-time-point expected value calculation unit that calculates a reception-time-point expected value which is an expected value of a next reception time point when detection data is subsequently received, from the reception time point and a sampling period; a jitter amount estimation unit that calculates a variation amount of the reception time point with respect to the reception-time-point expected value, as a system delay jitter amount; and an event-detection-time-point estimation unit that estimates an event detection time point, from a system delay time measured in advance, the reception-time-point expected value and the system delay jitter amount.

Receiver and event-detection-time-point estimation method

A digital broadcast reception device includes a first broadcast reception system, a second broadcast reception system, an audio similarity-degree detection processor, a service list storage unit, and a reception monitoring unit that sends a notification signal to the first broadcast reception system when a value representing reception status of a channel currently selected by the first broadcast reception system becomes low. Upon receiving the notification signal, the first broadcast reception system refers to values representing audio similarity-degree in a service list stored in the service list storage unit, thereby judges a program which is most similar to the program of the channel currently selected by the first broadcast reception system as an identical program, and switches the channel to a channel judged as the identical program.

Digital broadcast reception device and channel selection method

A digital broadcast receiver includes: a receiver that receives a broadcast signal of a physical channel in digital broadcasting; a current position detector that detects a current position; a current region determiner that determines, as a current region, a region to which the current position belongs; a receivability determiner that controls the receiver to determine whether the broadcast signal of the physical channel can be received; a storage unit that stores receivable area information indicating a receivable area where the broadcast signal of the physical channel can be received; and an updating unit that, when the receivability determiner determines that the broadcast signal can be received, obtains, out of the stored receivable area information, receivable area information for the current region indicating a receivable area in the current region, and performs an update process to update the receivable area information for the current region based on the current position.

Digital broadcast receiver and information updating method therefor

A digital broadcast receiver device () is provided with: a descrambling unit () which uses keys for a plurality of services to decrypt encrypted video data for the plurality of services and generates video data for the plurality of services; and a CAS control unit () which, for each of the plurality of services, measures the update period of the key information and the key processing time for generating keys from the key information and determines, from among the plurality of services, which services are to be descrambled, that is, to be decrypted by the descrambling unit (), selecting services such that the sum of the key processing times of all services to be decrypted is less than each one of the update periods of the services to be decrypted.

Digital broadcast receiver device and digital broadcast receiving method

A digital broadcast receiver on a mobile body includes: a tuner that receives a broadcast signal of a physical channel; a signal intensity detector that detects a signal intensity of the broadcast signal; a current position detector that detects a current position of the mobile body; a movement direction detector that detects a movement direction of the mobile body; a reception judging unit that controls the tuner to judge whether the physical channel can be received; an area information storage unit that stores receivable area information indicating a receivable area of the physical channel; and an area information updating unit that determines, when it is judged that the physical channel can be received, a position apart from the current position in the movement direction according to the signal intensity as a receivable position, and updates the receivable area information to extend the receivable area to the receivable position.

A digital broadcasting reception apparatus () is provided with: a reception unit () that receives a signal; a signal strength detection unit () that detects the received strength of the received signal; a channel scan control unit () that detects receivable physical channels; an area map storage unit () that stores coverage area information indicating coverage areas; a current position detection unit () that detects the current position; a tuning control unit () that determines a distance threshold value on the basis of the received strength detected by the signal strength detection unit when the channel scan control unit () detects a physical channel and the current position, at which the detection was made, is not included within the coverage area of the detected physical channel; and an area map generating unit () that expands the coverage area on the basis of the determined distance threshold value.

Digital broadcasting reception apparatus and digital broadcasting reception method

A digital broadcast receiving apparatus with enhanced tuning speed is provided. The digital broadcast receiving apparatus includes a data separating unit that separates the encoded stream of a tuned broadcast program and a plurality of latest tuning information from a digital broadcast stream, on the basis of stored tuning information recorded in a tuning information table, a decoding unit that performs a decoding process on the separated encoded stream, and a tuning control unit. The tuning control unit concurrently executes a first reception confirmation process to decide whether first tuning information included in the latest tuning information is consistent with the stored tuning information and a second reception confirmation process to decide whether second tuning information in the latest tuning information is consistent with the stored tuning information. The tuning control unit executes the first and second reception confirmation processes concurrently with the decoding process.

Digital broadcast receiving apparatus, digital broadcast receiving method and computer program

Disclosed is a digital broadcast reception device that includes a plurality of tuner/demodulator units; a tuning control unit; a current position detection unit for detecting a current position; a channel scan control unit that has one of the plurality of tuner/demodulator units perform tuning for program viewing or listening, and has another one of the plurality of tuner/demodulator units perform a channel scan by tuning to the physical channels sequentially and detecting receivable physical channels; a broadcast area map generation unit for generating broadcast area maps including the receivable physical channels when the channel scan is executed, broadcast service information regarding broadcast content of the physical channels, and receivable position information; and a broadcast area map storage unit for storing the generated broadcast area maps.

Digital broadcast reception device and digital broadcast reception method

The present invention provides a digital broadcast receiver which reduces the time needed for channel scans by performing efficient channel scanning when broadcasts in a plurality of broadcast protocols are received. As a first phase channel scan, a first controller and a second controller divide a plurality of channels included in an overlapping frequency band of a first broadcast protocol and a second broadcast protocol, and execute parallel channel scans. After the first phase channel scan, the first controller scans channels in which electrical signals generated from electromagnetic waves received by a second tuner in the first phase channel scan could not be demodulated by a second demodulator, and the second controller scans channels in which electrical signals generated from electromagnetic waves received by a first tuner could not be demodulated by a first demodulator.

Digital broadcast receiver

An object of the present invention is to provide a digital broadcast reception apparatus that allows a stable viewing even if a reception environment changes along with a movement. In the present invention, based on current position information indicating a current position detected by a current position detection section and broadcast area information stored in a broadcast area information storage section, a search-mode switching control section instructs a tuning control section to select a diversity operation mode if the current position is close to a boundary of a broadcast area, and select an independent reception operation mode if the current position is not close to the boundary of the broadcast area. In the diversity operation mode, a first system and a second system are tuned to the same physical channel, and cooperate with each other to demodulate a digital broadcast signal and a make an output through a diversity process. In the independent reception operation mode, the first system and the second system individually and independently demodulate the digital broadcast signal and make an output.

Digital broadcast reception apparatus

An unreceivability detector () that, based on various information obtained from a signal received from a broadcasting station of a digital broadcast program being viewed/listened to, detects that the received signal of that broadcasting station is currently unreceivable and outputs an unreceivability notification, an affiliated station memory () that stores channel information of the program being viewed/listened to and channel information of a station affiliated with that broadcasting station, and a tuning control unit () that, when it receives an unreceivability notification from the unreceivability detector, retrieves the channel information of the affiliated station from the affiliated station memory () and permits the program of the affiliated station to be viewed/listened to, if it is currently in a receivable state, and outputs an instruction to make a channel search for an affiliated station if no affiliated station is stored in the affiliated station memory are provided. When the program being viewed/listened to becomes unviewable/unlistenable, the time during which program viewing/listening is interrupted can be shortened.

Digital broadcast receiver and receiving method

A digital broadcast receiver includes an affiliated station storage unit that stores affiliated station information in which broadcasting stations are associated with information identifying affiliated stations of the broadcasting stations and reception service areas to which the affiliated stations broadcast, and a switching history storage unit that stores switching history information in which each reception service area is associated with information identifying other reception service areas; when the signal of the program being viewed/listened to becomes currently unreceivable, a tuning control unit identifies, from the switching history information, another reception service area to which switching was performed from the reception service area to which the broadcasting station broadcasting the program being viewed/listened to is broadcasting, determines an affiliated station in the identified other reception service area that is an affiliated station of the broadcasting station broadcasting the program being viewed/listened to, and tunes to the identified affiliated station.

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Tokyo, Japan

Keiichi Shirasuka