JP3747003B2 - Portable communication terminal - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a portable communication terminal, and more particularly, to a portable communication terminal having a voice recording / reproducing function such as a car phone used in a digital car phone system of a TDMA (Time Division Multiple Access) communication method.
[0002]
[Prior art]
First, the concept of mobile communication in the TDMA communication system will be described a little with reference to literature (MARUZEN Advanced Technology <Electronics / Information / Communication> "Mobile communication", "7-5 TDMA mobile communication"). The TDMA (Time Division Multiple Access) communication system is a system that, as the name suggests, time-divides a radio frequency, assigns a specific time zone to a communicator, and performs communication in the assigned time zone.
[0003]
When performing mobile communication using the TDMA communication method, communication is generally performed via a base station. The concept of mobile communication using the TDMA communication system is shown in FIG. Signal transmission / reception is performed using a pair of assigned time zones in a basic frame (referred to as a TDMA frame) (for example, transmission (B → M1) and reception (B → M1) pairs and transmission (M1 → B) and reception (M1 → B) pair). FIG. 4 shows a method of using one radio channel F1 from the base station B to the mobile station (cellular phone) and another radio channel F2 from the mobile station to the base station B. There is also a method for transmitting and receiving between the base station and the mobile station. In either case, burst transmission is performed from the mobile station to the base station.
[0004]
In order to show the time allocation of communication between the base station B and a certain mobile station M1 in a 1TDMA frame in a certain time zone, the time allocation on the radio channel on the base station B side is shown in FIG. FIG. 4B shows time allocation on the mobile station M1 side based on ().
[0005]
In FIG. 4A, the radio channel in which the data transmission direction is the direction from the base station B to the mobile station is indicated as F1, and the radio channel in the direction from the mobile station to the base station B is indicated as F2. As shown in FIG. 4A, the base station B can communicate with a maximum of six (= channel multiplexing number) mobile stations using the radio channels F1 and F2. FIG. 4B shows an example of time allocation when the mobile station M1 transmits and receives data to and from the base station B based on the example of time allocation shown in FIG. The data transmission / reception and the local oscillation frequency (local source frequency) of the mobile station M1 are shown.
[0006]
In the 1TDMA frame, as shown in FIG. 4B, when the mobile station M1 receives data from the base station B, the mobile station M1 sets the local source frequency of the mobile station M1 to F1 (in this case, F1 is determined from the mobile station M1). The data is received in synchronization with the traffic burst for the mobile station M1 of the base station B (hereinafter referred to as this time zone). Is referred to as a local station slot). On the other hand, at the time of data transmission, the mobile station M1 designates the local frequency of the mobile station station M1 as F2, and transmits data in synchronization with the traffic burst of the base station B to the mobile station M1.
[0007]
As described above, in the 1TDMA frame, the mobile station M1 has a free time zone (referred to as idle) with respect to communication with the base station B, except for transmission and reception. That is, when transmission is not performed but only reception is performed, all time periods other than reception are idle.
[0008]
Next, a description will be given of a conventional technique related to voice recording / playback in the portable communication terminal using the TDMA communication method. FIG. 5 shows a block diagram of an example of a conventional portable communication terminal. This portable communication terminal is a TDMA communication type mobile phone, which includes a transmission / reception unit 400, a voice recording / playback control unit 410, an intermittent reception timing generation timer 430 that generates an intermittent reception timing signal during battery saving control, and these transmission / reception units. 400, a central processing unit (CPU) 420 that performs a series of voice recording / playback control including control of the voice recording / playback control unit 410 and the intermittent reception timing generation timer 430, a voice signal processing unit 450, and a CPU 420 for voice recording / playback. A memory 460 that stores audio data and a key operation unit 470 that causes the CPU 420 to detect operation information related to audio recording and reproduction are provided.
[0009]
The transmission / reception unit 400 is synchronized with a radio unit 401 that receives and demodulates a modulated analog signal transmitted from a base station (not shown) via a radio channel, and data received from the base station demodulated by the radio unit 401. It has a synchronous clock generator 402 that outputs a clock.
[0010]
The CPU 420 detects the reception completion timing signal 411b from the timing generation unit 411, the data access performed via the I / O bus 418, the detection of the key input information 470a from the key operation unit 470, and reception OFF (OFF). Reception off designation to the transmission / reception unit 400 by the designation signal 420a, output of alarm time designation to the intermittent reception timing generation timer 430 via the alarm time designation / time readout 420b, and reading of the current time recorded by the intermittent reception timing generation timer 430 I do.
[0011]
Voice recording / playback control unit 410 stores voice encoded data (hereinafter referred to as downlink TCH data) 400a in a baseband digital signal transmitted from the base station to the mobile phone, and CPU 420 uses I / O bus 418. A downlink TCH data read buffer 413 that can be read via the I / O bus 418, and a downlink TCH data write buffer 414 that the CPU 420 can write via the I / O bus 418, and an audio signal processing unit 450 in the mobile phone. A buffer 417 for reading uplink TCH data, which stores voice encoded data (hereinafter referred to as uplink TCH data) 450a in a baseband digital signal to be transmitted to, and is readable by the CPU 420 via the I / O bus 418; , CPU 420 writes via I / O bus 418 That can select one of the outputs of the downlink TCH data 400a and the downlink TCH data write buffer 414 according to an instruction from the CPU 420 and output the selected data as the downlink TCH data 410a. 419, and a switch 41A that selects one of the outputs of the uplink TCH data 450a and the uplink TCH data write buffer 416 according to an instruction from the CPU 420 and outputs the selected data as the uplink TCH data 410b.
[0012]
The timing generation unit 411 transfers the downlink TCH data 400a received by the transmission / reception unit 400 to the downlink TCH data read buffer 413, or reads the downlink TCH data 400a from the downlink TCH data write buffer 414 as the downlink TCH data 410a. The timing signal to be transferred to 450, the uplink TCH data 450a output from the audio signal processing unit 450, the timing signal to be transferred to the uplink TCH data read buffer 417, and the uplink TCH data write buffer 416 or the uplink TCH data read A timing signal for transferring the uplink TCH data 410b read from the buffer 417 to the transmission / reception unit 400 is generated.
[0013]
The timing generation unit 411 is operated by the synchronization clock supplied from the synchronization clock generation unit 402, and the timing at which the CPU 420 detects when the mobile phone completes reception of the baseband digital signal transmitted by the base station. A reception completion timing signal 411b which is a signal is generated.
[0014]
The voice signal processing unit 450 decodes the downlink TCH data 410a selected and extracted by the switch 419, outputs a received voice digital signal, and receives the received voice digital signal output from the decoder 451 as the received voice. A receiving D / A converter 452 for converting into an analog signal, a receiving amplifier 453 for amplifying a receiving voice analog signal output from the receiving D / A converter 452, and an electric signal output from the receiving amplifier as an acoustic signal A speaker 454 for converting (received voice), a microphone 455 for converting sound (transmitted voice) into an electrical signal, a transmitter amplifier 456 for amplifying an electrical signal output from the microphone 455, and a transmitter amplifier 456. A transmission A / D converter 457 for converting an analog signal of a transmission voice to be output into a transmission voice digital signal, and a transmission A / D Performs coding of the reception voice digital signal interrupter 457 outputs, having the encoder 458 outputs the uplink TCH data 450a.
[0015]
FIG. 6 is a time chart showing an example of a voice recording / playback operation using the voice recording / playback function of a conventional mobile phone, taking a case of voice playback during battery saving as an example. It should be noted that in the operation of the voice recording / playback function related during and before voice playback, hardware processing is Hn (n is 1, 2, 3,...) And software processing (CPU 420 operation) is Sn (n is 1, 2, 3,...), The operation of the conventional audio recording / playback function will be described in order from the earliest with reference to FIGS. 5 and 6 together.
[0016]
When the CPU 420 determines that the battery is being saved, first, the switch 419 is switched and connected to the downstream TCH data writing buffer 414 side. Thereafter, when the transmission / reception unit 400 completes reception of P (incoming information) in the information transmitted from the base station to the mobile phone shown in FIG. As shown, reception completion timing 411b is generated and output to CPU 420 (process H21).
[0017]
Upon receiving this reception completion timing 411b, the CPU 420 outputs an alarm time designation / time readout signal 420b for receiving the next incoming information P, designates it as the intermittent reception timing generation timer 430, and starts the timer. A reception off designation signal 420a is output to the transmission / reception unit 400 (processing S11).
[0018]
When the reception off designation signal 420a is input, the transmission / reception unit 400 stops the reception operation as schematically shown at a low level in FIG. 6D, and the operation of the synchronous clock generation unit 402 is performed as shown in FIG. Stop as shown in E) (process H22).
[0019]
In the meantime, the intermittent reception timing generation timer 430 counts up as shown in FIG. 6B, and when it detects that the count value coincides with the alarm time set in the process S11, the reception on designation signal 430a. Is output to the transmitting / receiving unit 400 (processing H23). When the transmission / reception unit 400 detects the reception on designation signal 430a, the synchronous clock generation unit 402 oscillates as shown in FIG. 6E and starts receiving information P (processing H23).
[0020]
The processes indicated by H24, S12, and H25 in FIG. 6 after the completion of reception of the information P are performed in the same manner as H21, S11, and H22. In this state, when the user presses the reproduction start key of the key operation unit 470, reproduction start key information is output as the key input information 470a (process H26). Then, the CPU 420 detects the reproduction start key information and performs the following process S13.
[0021]
That is, the CPU 420 writes the first TCH data to be reproduced in the downlink TCH data writing buffer 414 and outputs a timing generation unit on / off designation signal 420c (designated on here) to the timing generation unit 411. For the purpose of generating a synchronous clock and causing the timing generation unit 411 to operate as soon as possible, the alarm time designation time read signal 420b is supplied to the intermittent reception timing timer 430 to designate the alarm time.
[0022]
When the timing generation unit 411 detects the timing generation unit on / off designation signal 420c, the timing generation unit 411 enters a timing generation enabled state as schematically shown at a high level in FIG. 6F (processing H27). In the meantime, the intermittent reception timing generation timer 430 counts up as shown in FIG. 6B, and when it detects that the count value coincides with the alarm time set in the process S13, Similarly, a timing signal for transferring the TCH data written in the downlink TCH data write buffer 414 is generated, the downlink TCH data is read, and is output via the switch 419. The audio signal processing unit 450 detects the downlink TCH data 410 a from the switch 419, decodes it, and outputs the reproduced audio from the speaker 454.
[0023]
Subsequently, the transfer completion point data timing generation unit 411 of the TCH data 410a outputs a TCH data read / write timing signal 412a as shown in FIG. 6G (process H29). When the CPU 420 detects the TCH data read / write timing signal 412a, the CPU 420 first writes the next TCH data to be reproduced in the downlink TCH data write buffer 414 (process S14). Thereafter, the processes of H29 and S14 are repeated until the reproduction is completed.
[0024]
Then, when the CPU 420 detects that the reproduction has been completed due to the end of all reproduction data transfer or the reproduction end key pressed by the user, the CPU 420 outputs an off designation signal as the timing generator on / off designation signal 420c (step S15). . Then, the timing generation unit 411 detects the off-designated timing generation unit on / off designation signal 420c, and stops timing generation as schematically shown at a low level in FIG. 6F (processing H30). Thereafter, the processes indicated by H31, S16, and H32 in FIG. 6 after the reception of the information P is completed are the same processes as H21, S11, and H22.
[0025]
Next, the above series of operations will be described with reference to the sequence diagram of FIG. 7, focusing on the processing procedure performed by the CPU 420 during audio reproduction. For convenience of explanation, “P + number” is attached to each process, and the process is explained in association with each process in FIG. 5 (Hn and Sn indicate those shown in FIG. 6).
[0026]
First, in step P11 (= S13) in FIG. 7, the CPU 420 writes (1) the first TCH data to be reproduced in the downlink TCH data writing buffer 414, and (2) sets the timing generator 411 to a timing on / off designation signal. The alarm time is specified to the intermittent reception timing timer 430 for the purpose of making it ON by 420c and generating the synchronous clock (3) and causing the timing generator 411 to operate as soon as possible.
[0027]
Subsequently, the CPU 420 writes the next TCH data to be reproduced in the downlink TCH data writing buffer 414 in step P12 (= S14) of FIG. In the next step P13 (= S15), the CPU 420 turns off the timing generation unit 411 by the timing generation unit on / off designation signal 420c when the reproduction ends due to the end of all reproduction data transfer or the user pressing the reproduction end key. specify. As described above, sound reproduction (in this example, sound reproduction during battery saving) is performed.
[0028]
[Problems to be solved by the invention]
However, in the above-described conventional portable communication terminal, there is a problem of restrictions due to the restrictions that the voice recording / playback function has. Here, the restriction that the conventional voice recording / playback function has is that the clock for operating the conventional voice recording / playback control unit 410 is used to receive information from the base station generated by the synchronous clock generation unit 402. It is a synchronous clock.
[0029]
In addition, the restriction by the restriction that the conventional voice recording / playback function has is that when the battery is saved, the synchronization clock is stopped except when information is received from the base station. Sometimes it is necessary to release the synchronous clock from the stopped state. Moreover, in order to cancel the synchronization clock from being stopped, the audio recording is performed as soon as possible from the time of occurrence of the voice recording / playback function operation start factor (for example, the user pressing the playback start key) while maintaining the information reception timing from the base station. In order to start the playback function operation (to increase the response speed to key presses), determine the timing of information reception from the base station closest to the time when the voice recording / playback function operation start factor occurred, and release the synchronization clock stop state ( In order to perform reception on designation 430a), it is necessary to designate and change the alarm time of the intermittent reception timing generation timer 430. As described above, in order to start the voice recording / reproducing function, it is necessary to change the alarm time designation of the timer 430 according to the restriction.
[0030]
In addition, the conventional portable communication terminal has a problem that software control is complicated. This is because the following operations need to be performed by software control in order to perform voice recording / playback control during battery saving. That is, (a) voice recording / playback control is started by changing the alarm time designation of the intermittent reception timing generation timer 430 which is a part of the control during battery saving ((3) in P11 above).
[0031]
Subsequently, during (b) voice recording / playback control, the number of reception completion timings 411b that occur is counted to recognize incoming information timing. Then, (c) at the end of the voice recording / playback control, from the time to the first incoming call information timing is recognized by counting the number of reception completion timings 411b to be generated, and the alarm time designation of the intermittent reception timing generation timer 430 is specified. Return to the original state and return to the battery saving control.
[0032]
The voice recording / playback control unit 410 has a strong restriction on the software as described above, and invites complicated software control. The complexity of software control also develops to the problem that it is also a factor in prolonging the software development period.
[0033]
The present invention has been made in view of the above points, and it is an object of the present invention to provide a portable communication terminal that can release software processing related to voice recording / playback from the restrictions imposed by the conventional voice recording / playback function. And
[0034]
Another object of the present invention is to provide a portable communication terminal capable of shortening the development period by streamlining software processing.
[0035]
[Means for Solving the Problems]
  In order to achieve the above object, a portable communication terminal according to a first aspect of the present invention includes a transmission / reception unit that wirelessly communicates with a base station and outputs a synchronization clock synchronized with received data from the base station, and a voice recording A memory for storing audio data for reproduction, a first timing signal synchronized with a synchronous clock, and a second timing signal asynchronous with the synchronous clock are generated, and the first and second timing signals are generated. A voice recording / playback control unit that records or plays back voice data to / from the memory, and decodes the first voice data received by the transmission / reception unit or reproduced from the memory to generate a transmitted voice, and a received voice An audio signal processing unit that converts the data into the second audio data and transmits it by the transmission / reception unit, a control unit that controls the transmission / reception unit and the audio recording / reproduction control unit, and at least audio recording / reproduction The operation means has an input means for inputting to the control means, and the control means records to the memory based on the second timing signal based on the voice recording or voice reproduction instruction input to the control means by the input means. The voice recording / playback control unit is controlled to input voice data or read voice data to be played back from the memory.
  According to the present invention, the voice recording / playback control unit temporarily stores the first voice encoded data received by the transmission / reception unit, and then transfers the first voice encoded data to the memory based on the read timing signal based on the second timing signal. The first buffer, the second buffer that temporarily stores the second audio encoded data read from the memory, and then the second buffer that is output to the audio signal processor, and the second buffer that is output from the audio signal processor After temporarily storing the 3 encoded audio data, a third buffer for transferring to the memory based on the read timing signal based on the second timing signal, and a synchronous clock from the transmission / reception unit generate a first timing signal. From the first timing signal generator, the second timing signal generator for generating the second timing signal, and the first timing signal generator A first switch that selects one of the first timing signal and the second timing signal from the second timing signal generator by the control signal from the control means; and the first speech encoded data received by the transmitter / receiver And a second switch that selects one of the second encoded audio data from the second buffer by a control signal from the control means.
[0036]
In the present invention, at the time of voice recording or voice reproduction, voice data to be recorded is input to the memory based on the second timing signal that is asynchronous with the synchronous clock synchronized with the received data from the base station, or the memory The audio data to be reproduced can be read out from.
[0037]
In order to achieve the above object, the portable communication terminal according to the second aspect of the invention is based on the control signal from the control means synchronized with the first timing signal, and the intermittent reception timing at the time of battery saving control to the transmission / reception unit. It further has an intermittent reception timing generation timer for supplying signals and performing intermittent reception operation. In the present invention, the transmission / reception unit can be operated for intermittent reception by the intermittent reception timing signal from the intermittent reception timing generation timer.
[0039]
Here, the first timing signal generation unit described above generates and outputs a reception completion timing signal indicating a point in time when reception of the first speech encoded data received by the transmission / reception unit is completed together with the first timing signal. It is good also as composition to do. Further, the present invention selects a fourth buffer that stores an answering machine response message in advance and an answering machine response message from the fourth buffer at the time of answering machine, and transfers it to the transmission / reception unit. It may have a configuration including a third switch that selects third speech encoded data from the processing unit and transfers it to the transmission / reception unit. Furthermore, the present invention is characterized in that the transmission / reception unit, the memory, the audio recording / playback control unit, the audio signal processing unit, the control unit, and the input unit constitute a TDMA communication type mobile phone.
[0040]
DETAILED DESCRIPTION OF THE INVENTION
Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows a block diagram of an embodiment of a portable communication terminal according to the present invention. This embodiment is a TDMA communication type mobile phone having a voice recording / reproducing function. In FIG. 1, a cellular phone having a voice recording / playback function according to the present embodiment includes a transmission / reception unit 100, a voice recording / playback control unit 110, and an intermittent reception timing generation timer 130 that generates an intermittent reception timing signal during battery saving control. A central processing unit (CPU) 120 that performs a series of voice recording / playback control including control of the transmission / reception unit 100, voice recording / playback control unit 110, and intermittent reception timing generation timer 130, a voice signal processing unit 150, and a CPU 120. It has a memory 160 for storing and reading voice data for voice recording and reproduction, and a key operation unit 170 for causing the CPU 120 to detect operation information related to voice recording and reproduction.
[0041]
The transmission / reception unit 100 synchronizes with a wireless device 101 that demodulates a modulated analog signal transmitted from a base station (not shown) through a wireless channel and data received from the base station that is demodulated by the wireless device 101. And a synchronous clock generation unit 102 that outputs a clock.
[0042]
The CPU 120 detects the reception completion timing signal 111b, the data access performed via the I / O bus 118, the detection of the key input information 170a, and the reception off designation for the transmission / reception unit 100 performed via the reception off designation signal 120a. The alarm time designation for the intermittent reception timing generation timer 130 and the reading of the current time recorded by the intermittent reception timing generation timer 130 can be performed via the alarm time designation / time readout signal 120b.
[0043]
The voice recording / playback control unit 110 stores voice encoded data (downstream TCH data) 100a in a baseband digital signal transmitted from the base station to the mobile phone, and the CPU 120 reads it via the I / O bus 118. A downlink TCH data read buffer 113, a downlink TCH data write buffer 114 capable of writing the TCH data read from the memory 160 by the CPU 120 via the I / O bus 118, and the cellular phone. The voice encoded data (upstream TCH data) 150a in the baseband digital signal transmitted from the voice signal processing unit 150 to the base station is stored, and the CPU 120 can be read out via the I / O bus 118. TCH data reading buffer 117 and C Connection to the uplink TCH data write buffer 116, the first timing generation unit 111, the second timing generation unit 112, and the audio signal processing unit 150, which the U 120 can write via the I / O bus 118. Whether the downlink TCH data 100a or the readout output of the downlink TCH data write buffer 114 is the switch 119 selectable by the CPU 120 and the connection to the transmission / reception unit 100 is the uplink TCH data 150a, A switch 11A that can be selected by the CPU 120 as to whether to output the uplink TCH data write buffer 116, and a signal supply source of the timing signal 111a required for writing or reading the buffers 113, 114, 116, and 117. The timing generator 111 or the timing generator Whether to 12, and a switch 11B which CPU120 is selectable.
[0044]
The timing generation unit 111 and the timing generation unit 112 transfer the downlink TCH data 100a from the transmission / reception unit 100 to the downlink TCH data read buffer 113 or from the downlink TCH data write buffer 114 via the switch 119. A timing signal to be transferred to the audio signal processing unit 150 as the downlink TCH data 110a, a timing signal to transfer the uplink TCH data 150a from the audio signal processing unit 150 to the uplink TCH data reading buffer 117, and an uplink TCH data writing buffer 116 or a timing signal to be transferred to the transmitting / receiving unit 100 as the uplink TCH data 110b from the uplink TCH data reading buffer 117 via the switch 11A.
[0045]
However, the first timing generation unit 111 operates by the synchronization clock supplied from the synchronization clock generation unit 102, and detects when the mobile station has received the baseband digital signal transmitted by the base station to the CPU 120. A reception completion timing signal that is a timing signal to be generated is generated. On the other hand, the second timing generation unit 112 operates independently of the synchronization clock output from the synchronization clock generation unit 102 and generates a timing signal for operating the audio recording / playback control unit 110.
[0046]
The audio signal processing unit 150 decodes the downlink TCH data 110a input from the audio recording / playback control unit 110, outputs a received audio digital signal, and receives the received audio digital signal output from the decoder 151. A receiving D / A converter 152 for converting into a voice analog signal, a receiving amplifier 153 for amplifying a receiving voice analog signal output from the receiving D / A converter 152, and an electric signal output from the receiving amplifier 153 A speaker 154 that converts sound (received voice) into sound, a microphone 155 that converts sound (transmitted voice) into an electrical signal, a transmitter amplifier 156 that amplifies the electrical signal output from the microphone 155, and a transmitter amplifier A transmission A / D converter 157 for converting an analog signal of a transmission voice output from 156 into a voice digital signal, A / A for transmission Performs coding of the reception voice digital signal converter 157 outputs, and a encoder 158 for outputting an uplink TCH data 150a with respect to the voice recording and reproducing controller 110.
[0047]
FIG. 2 is a time chart showing an example of the voice recording / playback operation of a mobile phone having the voice recording / playback function of the present invention, taking the case of voice playback during battery saving as an example. It should be noted that in the operation of the voice recording / playback function related during and before voice playback, hardware processing is Hn (n is 1, 2, 3,...) And software processing (CPU 120 operation) is Sn (n is 1, 2, 3, ...). In addition, as information that the base station schematically shown in FIG. 2A issues to the mobile phone, P is incoming information and B is base station information.
[0048]
Based on the above, the operation of the voice recording / playback function of the present embodiment will be described in order from the earliest with reference to the time chart of FIG. When the CPU 120 determines that the battery is being saved, first, the switch 11B is connected to the terminal 1 side, that is, the output side of the second timing generation unit 112, and the switch 119 is connected to the terminal 2 side, that is, the downlink TCH data write buffer 114. Connect to the output side.
[0049]
After that, when the transmission / reception unit 100 completes reception of P (incoming information) in the information transmitted from the base station to the mobile phone shown in FIG. 2A, the first timing generation unit 111 As shown in C), the reception completion timing 111b is generated and output to the CPU 120 (processing H1).
[0050]
Upon receiving this reception completion timing 111b, the CPU 120 outputs an alarm time designation / time readout signal 120b for receiving the next incoming call information P, designates the alarm time in the intermittent reception timing generation timer 130, and starts the timer. In addition, the reception off designation signal 120a is output to the transmission / reception unit 100 (processing S1).
[0051]
When the reception off designation signal 120a is input, the transmission / reception unit 100 stops the reception operation as schematically shown at a low level in FIG. 2D, and the operation of the synchronous clock generation unit 102 is performed as shown in FIG. Stop as shown in E) (process H2).
[0052]
In the meantime, the intermittent reception timing generation timer 130 counts up as shown in FIG. 2B, and when it detects that the count value coincides with the alarm time set in the process S1, the reception ON designation signal 130a. Is output to the transmission / reception unit 100 (processing H3). When the transmission / reception unit 100 detects the reception on designation signal 130a, the synchronous clock generation unit 102 oscillates as schematically shown in FIG. 2E and starts receiving the incoming information P (processing H3).
[0053]
The processes indicated by H4, S2, and H5 in FIG. 2 after the reception of the incoming call information P are performed in the same manner as H1, S1, and H2. When the user presses the reproduction start key of the key operation unit 170 in this state, reproduction start key information is output as the key input information 170a (processing H6). Then, the CPU 120 detects the reproduction start key information and performs the following process S3.
[0054]
That is, the CPU 120 reads out the first TCH data to be reproduced from the memory 160, supplies it to the downlink TCH data write buffer 114 via the I / O bus 118, writes it, and outputs the timing generator on / off designation signal 120c (here) Then, “ON” is specified) is output to the timing generation unit 112.
[0055]
When the timing generation unit 112 detects the ON designation by the timing generation unit ON / OFF designation signal 120c, the timing generation unit 112 is brought into an operation state as schematically shown at a high level in FIG. 2F, and is stored in the downlink TCH data writing buffer 114. A timing signal for reading the written TCH data is generated and supplied to the downlink TCH data writing buffer 114. As a result, the TCH data read from the downlink TCH data writing buffer 114 is output to the audio signal processing unit 150 as the downlink TCH data 110a via the switch 119.
[0056]
Here, in the present embodiment, the timing signal generation operation by the timing generation unit 112 described above is performed independently of the synchronization clock from the synchronization clock generation unit 102, and therefore, from the downlink TCH data write buffer 114. The TCH data read operation can be performed regardless of synchronization with the base station via the wireless device 101. The audio signal processing unit 150 detects the downlink TCH data 110 a from the switch 119, decodes it, and outputs reproduced audio from the speaker 154.
[0057]
Subsequently, the transfer completion point data timing generation unit 112 of the TCH data 110a outputs the TCH data read / write timing signal 112a as shown in FIG. 2G and supplies it to the CPU 120 (process H8). When the CPU 120 detects the input of the TCH data read / write timing signal 112a, the CPU 120 first writes the next TCH data to be reproduced read from the memory 160 to the downlink TCH data write buffer 114 via the I / O bus 118. (Processing S4). Thereafter, the processes of H8 and S4 are repeated until the reproduction is completed. However, in FIG. 2, in H9, the same processing as the processing H3 described above is performed, and in H10, S5, and H11, the same processing as the processing H1, S1, and H2 described above is performed.
[0058]
When the CPU 120 detects the end of reproduction due to the end of all reproduction data transfer or the user pressing the reproduction end key, the CPU 120 outputs an off designation signal to the timing generation section 112 as the timing generation section on / off designation signal 120c. (Processing S6). Then, the timing generation unit 112 detects the off-designated timing generation unit on / off designation signal 120c, and stops timing generation as schematically illustrated at a low level in FIG. 2F (processing H12).
[0059]
Next, the series of operations described above will be described with reference to the sequence diagram of FIG. 3, focusing on the processing procedure performed by the CPU 120 during audio reproduction. For convenience of explanation, “P + number” is attached to each process, and explanation is given in association with each process in FIG. 3 (Hn and Sn indicate those shown in FIG. 2).
[0060]
First, in step P1 (= S3) in FIG. 3, the CPU 120 reads the first TCH data to be reproduced from the memory 160 and writes it to the downlink TCH data writing buffer 114 via the I / O bus 118, 2) The timing generator 112 is turned on by the timing on / off designation signal 120c.
[0061]
Subsequently, in step P2 (= S4) in FIG. 3, the CPU 120 reads the next TCH data to be reproduced from the memory 160 and writes it to the downlink TCH data writing buffer 114 via the I / O bus 118. Then, in the next step P3 (= S6), when the CPU 120 finishes reproduction due to the completion of all reproduction data transfer or the reproduction end key pressed by the user, the timing generator 112 is turned off by the timing generator ON / OFF designation signal 120c. specify. As described above, sound reproduction (in this example, sound reproduction during battery saving) is performed.
[0062]
The above is the sound reproduction operation during battery saving. When recording the downlink TCH data 100a, the CPU 120 controls the CPU 120 after serial-parallel conversion (so-called serial-parallel conversion) by the downlink TCH data reading buffer 113. Are read based on the timing signal 111 a output from the timing generation unit 112 and written to the memory 160 via the I / O bus 118. Further, the uplink or downlink TCH data for reproduction is written in the downlink CH data writing buffer 114, where it is subjected to parallel / serial conversion (so-called paraserial conversion) and output to the decoder 151.
[0063]
The upstream TCH data 150a is automatically serial-parallel converted by the upstream TCH data reading buffer 117, stored, read under the control of the CPU 120, and stored in the memory 160 via the I / O bus 118. . The uplink TCH data writing buffer 116 is used when an answering message is transmitted to the other party as uplink TCH data. Only at this time, the switch 11A is connected to the terminal 1 side by the CPU 120, and the uplink TCH data writing is performed. The TCH data of the answering machine response message read from the buffer 116 is output to the transmission / reception unit 100.
[0064]
Next, another embodiment will be described. In the above-described embodiment, the CPU 120 analyzes the key input information 170a to start or end the voice recording / playback operation. However, the present invention is not limited to this. The voice recording / playback function may be configured only by hardware by configuring a series of operations for starting or ending the voice recording / playback operation as a result of the logic circuit.
[0065]
In this case, for example, the CPU 120 analyzes the input key from the key input information 170a by the key operation unit 170 and outputs the timing generation unit on / off designation information to the timing generation unit 112 by a logic circuit.
[0066]
Note that the present invention is not limited to the above embodiment. For example, the reception TCH data is written to the memory 160 based on the timing signal output from the second timing generation unit 112 even during voice recording. Is done. Further, the present invention can be widely applied to portable communication terminals such as mobile phones other than the mobile phone used in the TDMA communication type digital mobile phone system.
[0067]
【The invention's effect】
As described above, according to the present invention, at the time of voice recording or voice reproduction, recording is performed on the memory based on the second timing signal that is asynchronous with the synchronous clock synchronized with the received data from the base station. Since voice data is input or voice data to be played back is read out from the memory, the voice recording / playback function can be operated regardless of synchronization with the received data from the base station. There is no need to change the alarm time of the intermittent reception timing generation timer to release the synchronous clock from the stopped state when saving, and it can be released from restrictions due to restrictions of the conventional voice recording and playback function, and it can be used for voice recording and playback Such software processing can be simplified.
[0068]
Thereby, according to the present invention, since the software processing is simplified, the design / evaluation period, which is the software development process, can be shortened naturally, leading to a shortened development period.
[Brief description of the drawings]
FIG. 1 is a block diagram of an embodiment of a portable communication terminal having a voice recording / playback function of a TDMA communication system according to the present invention.
2 is a time chart for explaining the operation of the portable communication terminal of FIG. 1;
3 is a diagram showing a processing procedure of a CPU of the portable communication terminal of FIG.
FIG. 4 is an explanatory diagram of a concept of mobile communication in a general TDMA communication system.
FIG. 5 is a block diagram of an example of a portable communication terminal having a voice recording / playback function of a conventional TDMA communication method.
6 is an operation time chart of the portable communication terminal of FIG.
7 is a diagram showing a processing procedure of a CPU of the portable communication terminal of FIG.
[Explanation of symbols]
119, 11A, 11B switch
100 transceiver
100a, 110a Downlink TCH data
101 radio
102 Synchronous clock generator
110 Voice recording / playback controller
110b, 150a Uplink TCH data
111, 112 Timing generator
111a Timing signal for writing / reading each buffer
111b Reception completion timing signal
112a Downlink TCH data read / write timing signal
113 Buffer for reading downlink TCH data
114 Downstream TCH data write buffer
116 Uplink TCH data write buffer
117 Uplink TCH data read buffer
118 I / O bus
120 Central processing unit (CPU)
120a Reception off designation signal
120b Alarm time designation / time readout signal
120c Timing generator on / off designation signal
130 Intermittent reception timing generation timer
130a Reception ON designation signal
150 Audio signal processor
160 memory
170 Key operation unit

Claims (4)

A wireless communication unit with the base station, and a transmission / reception unit that outputs a synchronous clock synchronized with the received data from the base station;
A memory for storing voice data for voice recording and playback;
A first timing signal synchronized with the synchronous clock and a second timing signal asynchronous with the synchronous clock are generated, respectively, and audio is sent to the memory using the first and second timing signals. A voice recording / playback control unit for recording or playing back data;
Audio signal processing that decodes the first audio data received by the transmission / reception unit or reproduced from the memory to generate a transmitted voice, converts the received voice into second audio data, and transmits the second audio data by the transmission / reception unit And
Control means for controlling the transmission / reception unit and the voice recording / playback control unit;
Input means for inputting at least operation information related to the voice recording / playback to the control means, and the voice recording / playback control section temporarily stores the first voice encoded data received by the transmission / reception section. A first buffer for transferring to the memory based on a read timing signal based on the second timing signal; and a second audio encoded data read from the memory after temporarily storing the audio signal processing unit And temporarily storing the second buffer to be transmitted and the third encoded audio data to be transmitted output from the audio signal processing unit, and then to the memory based on the read timing signal based on the second timing signal A third buffer to be transferred, and a first timing signal that operates in accordance with a synchronous clock from the transmission / reception unit and generates the first timing signal. A signal generation unit, a second timing signal generation unit that generates the second timing signal, the first timing signal from the first timing signal generation unit, and the second timing signal generation unit A first switch that selects one of the second timing signals according to a control signal from the control means; the first speech encoded data received by the transceiver; and the second from the second buffer. A second switch for selecting one of the encoded audio data by a control signal from the control means,
Based on voice recording or voice playback instruction input to the control means by the input means, the control means inputs voice data to be recorded to the memory or plays back from the memory based on the second timing signal. A portable communication terminal that controls the voice recording / playback control unit to read voice data to be read.   An intermittent reception timing generation timer for supplying an intermittent reception timing signal during battery saving control to the transmission / reception unit based on a control signal from the control unit synchronized with the first timing signal to perform an intermittent reception operation; The portable communication terminal according to claim 1. The first timing signal generation unit generates and outputs a reception completion timing signal indicating a time point when reception of the first speech encoded data received by the transmission / reception unit is completed together with the first timing signal. The portable communication terminal according to claim 1 . A fourth buffer storing an answering machine response message in advance, and an answering machine response message from the fourth buffer at the time of answering machine answer are selected and transferred to the transmission / reception unit. the third third of the mobile communication terminal of any one of claims 1 to 3, characterized in that a switch for transferring selected audio encoded data to the transceiver unit of the.

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