• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The present invention relates to a telephone apparatus having a keyboard having a key which prevents any electrical connection with the associated circuit. A sound source frequency generator 23 is provided that includes a mechanical element that can vibrate at a particular frequency under each key. The sub-set 25 detects these frequencies, locates their sound sources, converts them into electrical signals, and then guarantees processing of the data corresponding to these signals and therefore specifically pressed keys.
    公开号:KR19990068206A
    申请号:KR1019990002886
    申请日:1999-01-29
    公开日:1999-08-25
    发明作者:라펠리쥬아
    申请人:요트.게.아. 롤페즈；코닌클리케 필립스 일렉트로닉스 엔.브이.；
    IPC主号:
    专利说明:

    Telephony equipment comprising a keyboard with sound generating keys
    The present invention relates to an electronic device comprising a plurality of control keys and means for identifying the keys.
    The present invention also relates to a key press detection method for identifying a pressed key among a plurality of keys.
    The present invention can be used in any electronic device, especially portable telephone device, for which keyboard-input is required.
    Summary No. 63-233647 (A) of Japanese Patent Application No. 62-65750, published March 23, 1987, details a keyboard to which a sound generator is coupled. The sound transmitted due to the operation of one key is transmitted through the loudspeaker to the appropriate circuit of the telephone receiver and routed to the computer by conventional telephone channels, which will allow the computer to achieve detection of the keyboard.
    It is an object of the present invention to provide a device for detecting the operation of a key that is very different from a keyboard comprising a sound generator. In particular, the detection of the keyboard is achieved by identifying the position of a sound source that is locally operated by pressing a key.
    Therefore, the device defined at the beginning is said identification means,
    A number of local sound sources controlled by said key and for generating a sound signal; And
    A sub-assembly for receiving the sound at an input and for locating the sound source.
    This structure, which forms a mechanically simple device, can be beneficially integrated with a data communication device operating as a printed circuit board, in fact the position of the keyboard relative to the printed wiring board is arbitrary, because This is because there is no link other than the acoustic link between the two. The keyboard may have its original form or may be bent, for example.
    In addition, the absence of an electrical connection between the back of the keyboard and the printed wiring board allows the device to be thinned. Finally, the acoustic frequency should be chosen to be outside of the audible frequency range.
    According to an important feature of the invention, the positioning sub-assembly (sub-assembly),
    Detecting means for detecting the sound signal,
    Storage means for storing the detected signal;
    Calculation means for evaluating a correlation ratio between the stored signals for detecting a detection delay,
    Comparison means for comparing the detection delay with a set delay corresponding to each sound source and for locating the sound source as a function of the comparison result.
    The detecting means comprises at least an acoustic sensor. The activated key is identified by determining the position of the sound source relative to the position of the sensor. By calculating the correlation ratio between the various captured sound signals, it becomes possible to determine the relative detection delay between sounds transmitted by the same sound source to identify the position of the sound source relative to the sensor.
    It is another object of the present invention to provide a key press detection method, wherein each key is associated with a local sound source for generating a sound signal in the direction of at least one sensor, the method comprising:
    Propagating a first sound signal in the direction of the first sensor and a second sound signal in the direction of the second sensor based on the local sound source,
    Detecting and digitizing the first and second signals;
    Storing the digitized signal;
    Calculating a correlation product between the first and second stored signals to determine the detection delay between the signals and to derive the position of the sound source therefrom.
    These and other aspects of the present invention will become apparent from the following examples with reference to the accompanying drawings.
    1 shows an embodiment (portable telephone apparatus) according to the present invention.
    2 is a side view of the telephone apparatus shown in FIG. 1;
    3 illustrates an embodiment of a keyboard key.
    4 and 5 show another embodiment of a key in the rest position and vice versa in a vibraging return movement to the stable position, respectively.
    6 is a view showing a positioning device according to an embodiment of the present invention.
    7 is a view showing another embodiment of the positioning device shown in FIG.
    8 is a flow chart illustrating a method of detecting key presses in accordance with the present invention.
    ♠ Explanation of symbols for the main parts of the drawings.
    23: signal generator
    24, 61, 62: microphone
    25: sub-assembly
    31: deformable part
    32: push pin
    63, 64: Bandpass Filter
    65, 66: amplifier
    67, 68: Analog-to-digital converter
    In the illustrative embodiment shown in FIG. 1, the keyboard of the portable telephone apparatus 1 has twelve (10a to 101) corresponding to 0 to 9 and function keys (# and *) to be mechanically pressed by the user. It contains the key. Behind each key is a contact that blocks the electronic signal processing circuit in general in connection with the transmission of data corresponding to the key under the influence of the operation of the pressed key, or in connection with any other processing not directly related to the present invention. Is present.
    In the embodiment according to the invention shown in FIG. 2 showing the telephone apparatus from the side, the apparatus comprises a keyboard 20 with keys 21a, 21b etc. pre-positioned on the surface of the housing 22. However, no electrical connection is included on the back side of the key located inside the device.
    Each of these keys, for example 21a, is simply related to a mechanical device for generating sound or soundwaves (such a device 23 schematically shown in FIG. 2 will be described in more detail below).
    Sound waves generated by the operation on the key 21a are propagated and received by the microphone 24. Located away from the housing, this microphone relates to the electronic sound source locating means. These means are shown in detail in FIG. 6, for example, to remember the incoming waves, to measure their correlation ratios to derive their relative delays and to compare these delays with a set value. It will recognize the key pressed in this manner.
    Electronic means associated with the microphone 24 are housed in a sub-assembly 25 that forms an electronic signal-processing module. Module 26 (not shown in detail) couples power supply means together with the telephone apparatus.
    The form of the sound signal generator 23 is, for example, the form of FIG. 3. Under each key there is a push pin 32 against a deformable part 31 which is in a rest position under the influence of a push P on the pin through the key. Can be vibrated at a predetermined frequency.
    According to another embodiment of the device 23 (FIG. 4, stable position), it may for example consist of a convex membrane or diaphragm of metal. When this diaphragm is pressed down in the stable position (FIG. 4, arrow 41), it will deform and take a concave shape (arrow 42). This change is also possible in reverse: once the thrust disappears, the diaphragm (Fig. 5, arrow 43) returns to its original convex position. This rapid double movement causes short vibrations (represented by 44 in FIG. 4) of the diaphragm, or a portion of the diaphragm, to produce sound or sound waves.
    As a matter of course, no matter which embodiment is considered, the frequency of the wave will be chosen to be within or outside the audible frequency range.
    The positioning device according to the invention is shown in FIGS. 6 and 7, in which the elements forming the sub-assembly 25 are shown in detail.
    In these illustrative embodiments of the sound wave generating apparatus described above with reference to FIGS. 3 to 5, the sub-assembly 25 locates the sound source via microphones 61 and 62. The electronic signal is then transmitted in response to the data associated with the pressed key.
    In the following description each key is considered to be related to a local sound source for generating a sound signal (or incoming wave) in the direction of the two sensors. If the incoming waves reaching the sensors from the same sound source can cover different propagation paths (especially paths by reflections on the wall), and one sensor will be sufficient if it is discernible upon detection.
    In the embodiment shown in Figs. 6 and 7, three keys 10a, 10b and 10c operate three sound sources (not shown) and sound waves shown as a1, a2, b1, b2, c1 and c2. Occurs. Two microphones 61 and 62 are arranged in the housing so as to receive an incoming wave from each sound source (the housing inner wall does not reflect). Each microphone 61, 62 is a sound sensor that detects an analog signal corresponding to each incoming wave. This signal is then filtered by a bandpass filter 63, 64 and amplified by amplifiers 65, 66 before being digitized and processed by the computing element.
    The operation of the positioning device 25 will be described with reference to FIG. The filtered and amplified analog signal is sampled and digitized by analog-to-digital converters (CAN) 67 and 68 and then stored in RAM and then processed by element 69. This device, for example a digital signal processor (DSP), also includes a read-only memory (ROM) in which the setting values are stored. The two microphones 61 and 62 then capture the two sound waves a1 and a2 generated by the pressing of the key 10a before being digitized and stored in the RAM of the DSP.
    It is then verified whether the captured sound originates from the pulse generated by the sound generator provided directly below each key. For this purpose, the DSP calculates the energy of each incoming wave a1 and a2 and compares it with the set energy threshold in the ROM memory. If the calculated energy is above the set threshold, the DSP proceeds to the next step. If not, a detection error occurs and no key is recognized.
    In order to improve detection reliability, a facultative additional calculation is performed to verify that the shape of the received sound resembles the shape of the expected sound. Thus, the model of the signal transmitted by the sound generator is compared with the type of signal stored in the ROM and transmitted to the DSP by the converter CAN. The reference model is formed by L samples called Xref (n), where n is a digitizing index ranging from 0 to L-1. The signal received from the microphone 61 by the DSP is formed by the samples X1 (0) to X1 (L-1). To detect the similarity between the received sample and the reference sample, the DSP calculates their correlation ratio:
    The result is then compared with a threshold that is between 0.5 and 1. Typically this value is taken to be equal to 0.9. If the result is above this threshold, an appropriate signal is considered detected and processing continues. If not, an error is detected.
    This acceptable step makes the method used to recognize the spatial source of sound received by the sensor even more certain.
    If the shape of each received signal is sufficiently similar to the reference model, the relative delay between the two signals received at the level of the sensor is determined by calculating the correlation ratio between the received samples. The calculation of the delay is performed by the DSP based on the L samples received from the transducers 67 and 68 in the sampling period Te.
    Assume that X1 is the signal captured by microphone 61 and X2 is the signal captured by microphone 62. Rmin and Rmax are defined as Rmin. Te is assumed to be equal to the minimum detection shift between the two microphones and the minimum detection shift of Rmax. Te is assumed to be equal to the maximum detection shift between the two microphones. The following formula can be calculated:
    Where R represents the time shift between detections and r is an integer lying between Rmin and Rmax. If R is positive, 61 leads 62. In the opposite case, 62 leads 61. If near zero, the two signals are detected almost simultaneously. In the correspondence table stored in the ROM, it is verified which key corresponds to this result.
    In fact, pressing a key on the keyboard corresponds to a detection delay between the two sensors. Thus the delay corresponding to each key is referenced in ROM to enable the DSP to know which key was pressed. In the above embodiment, 61 leads to 62 correspond to the detection of the key 10a, 62 leads to 61 correspond to the detection of the key 10c, and simultaneous detection of 61 and 62 results in the key 10b. Corresponds to the detection of.
    7 illustrates another embodiment of the present invention. Only the part of the device 25 located in the right part of FIG. 6 is shown. Obviously, the same modifications can be made in the left part of the device to perform the operation. This variant consists of the addition of a threshold-detection device 70 to prevent the incoming energy calculation step. Such a device known per se would be, for example, a diode detector with one input connected to the output of an amplifier 65 or 66 and the output connected to an activation port of the DSP 69. This measure aims to minimize the DSP's energy consumption by activating the DSP only to process already selected signals.
    The key press detection method according to the present invention shown in FIG. 7 is shown in the flowchart of FIG. 8. The method comprises the following steps K1 to K10:
    K1: The local sound source is activated by pressing a key, the first sound signal X1 propagates in the direction of the first sensor and the second sound signal X2 propagates in the direction of the second sensor. ;
    K2: detection of each signal by either sensor;
    K3: level check of each signal and comparison with a threshold;
    K4: Digitization of each signal by means of an analog-to-digital converter (CAN), said steps K3 and K4 are performed in parallel;
    K5: If the levels of the two signals are above the threshold according to K3, then each digitized signal X1 (n) and X2 (n) is stored in memory, if not, the method indicates a detection error ( K6);
    K7: The correlation ratio for the reference model is calculated for each signal. If the shape of the two signals is sufficiently similar to the reference model, go to step K8, if not, a detection error appears (K6);
    K8: The correlation product between the two signals X1 (n) and X2 (n) is calculated to determine the detection delay R between these two signals;
    K9: this delay is compared with the setpoint corresponding to each sound source to determine the activated sound source;
    K10: Acknowledge and terminate the pressed key.
    The key press detection apparatus and method according to the present invention applied to a telephone apparatus have been described and illustrated. Obviously, the present invention would be readily applicable to other electronic devices, in particular any telecommunication device, including a control key.
    权利要求:
    Claims (9)
    [1" claim-type="Currently amended] An electronic device comprising a plurality of control keys and means for identifying the keys,
    The identification means,
    A number of local sound sources controlled by the key and for generating a sound signal, and
    And a sub-assembly for receiving the sound signal at an input to determine the position of the sound source.
    [2" claim-type="Currently amended] The method of claim 1, wherein the positioning sub-assembly,
    Detecting means for detecting the sound signal;
    Storage means for storing the detected signal;
    Calculation means for evaluating a correlation ratio between the stored signals to detect a detection delay;
    And comparison means for defaming the detected delay with a set delay corresponding to each sound source and for locating the sound source as a function of the comparison result.
    [3" claim-type="Currently amended] 2. The device of claim 1, wherein the sound source comprises a mechanical frequency generator under each key that includes a deformable portion that can vibrate around a position of rest at a particular frequency under the influence of a pin located under the key. Characterized by an electronic device.
    [4" claim-type="Currently amended] 4. The mechanical element of claim 3, wherein the mechanical element associated with each key is a convex diaphragm capable of returning to its original convex position by vibrating at a particular frequency under the influence of a deformation that brings the convex diaphragm to a concave position. Characterized by an electronic device.
    [5" claim-type="Currently amended] The apparatus of claim 1, wherein the apparatus comprises providing the input control signal to a data communication device comprising a signal processing stage for converting the input control signal into an electronic signal corresponding to the data. Characterized by an electronic device.
    [6" claim-type="Currently amended] 6. The electronic device of claim 5, wherein the data communication device is integrated with a telephone device.
    [7" claim-type="Currently amended] In the key press detection method for identifying a key pressed from a plurality of keys,
    Each key is related to a local sound source for generating a sound signal in at least one sensor direction, the method comprising:
    Based on the local sound source, propagating a first sound signal toward a first sensor and propagating a second sound signal toward a second sensor;
    Detecting and digitizing the first and second signals;
    Storing the digitized signal;
    Calculating a correlation product between the first and second stored signals to determine a detection delay between the signals and derive the position of the sound source therefrom. Way.
    [8" claim-type="Currently amended] 8. The method of claim 7, wherein the detecting and digitizing step comprises a checking substep, wherein the checking substep comprises selecting a signal having a level higher than a first threshold for the remainder of the method. Key press detection method.
    [9" claim-type="Currently amended] 8. The preliminary selection step of claim 7, wherein the calculating step includes a preliminary selection step comprising evaluating a correlation ratio between each stored signal and a reference model stored in the memory and storing only a signal whose ratio is greater than or equal to a second set value. The key press detection method characterized by the above-mentioned.
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    同族专利:
    公开号 | 公开日
    EP0933909A1|1999-08-04|
    JPH11273493A|1999-10-08|
    CN1233125A|1999-10-27|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    法律状态:
    1998-01-30|Priority to FR9801078
    1998-01-30|Priority to FR9801078
    1999-01-29|Application filed by 요트.게.아. 롤페즈, 코닌클리케 필립스 일렉트로닉스 엔.브이.
    1999-08-25|Publication of KR19990068206A
    优先权:
    申请号 | 申请日 | 专利标题
    FR9801078|1998-01-30|
    FR9801078|1998-01-30|
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