JPH09149099A - Radio telephone set - Google Patents

Abstract

PROBLEM TO BE SOLVED: To set calling sound to optional sound with simple constitution by supplying prescribed compressed sound data stored in a storage means for storing compressed sound data to a decoding means as the data of the calling sound. SOLUTION: Sound signals inputted from a microphone 12 are converted to digital sound signals in an analog/digital converter 14 and supplied through a data processing circuit 8 to a sound data encoding/decoding circuit 30, an encoding processing is performed and the encoded sound data are stored in the storage area for the calling sound of a RAM 21. Then, in the case of outputting the calling sound, when it is judged that the data of the calling sound are registered in the RAM 21, the registered data of the calling sound are read from the RAM 21. Then, the read data are supplied to the sound data encoding/decoding circuit 30, a decoding processing is performed and a processing for converting the decoded sound data to analog sound signals and outputting them from a speaker 11 is performed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wireless telephone such as a mobile telephone, and more particularly to a wireless telephone applied to a wireless telephone system in which a voice signal is transmitted as compressed digital data.

[0002]

2. Description of the Related Art Conventionally, when a mobile radio telephone receives a signal transmitted from a base station or the like and receives a call (that is, when the telephone is called), the telephone is called as a notification means included in the telephone. A process of causing a sound generation circuit to generate a ringing tone signal, supplying the ringing tone signal to a speaker or the like, and emitting the ringing tone signal is performed.
Then, the owner of this telephone can confirm the incoming call by the ringing tone.

FIG. 4 shows an example of a configuration for outputting a ringing tone of a conventional wireless telephone, for example, DTMF.
The frequency signal output from the dial tone forming circuit 51 of the telephone, which is a combination of a plurality of frequencies called (Dual Tone Multi Frequency), is supplied to the attenuator 53 and the amplifier 54 via the low pass filter 52, and the attenuator 5
3 and the amplifier 54 generate a frequency signal having an appropriate level.
Then, the output signal of the amplifier 54 is supplied to the mute circuit 55 to be a signal output intermittently in a predetermined cycle, and this intermittent frequency signal is emitted from the speaker 56.

With such a configuration, a ring tone can be output with a relatively simple structure by using a circuit such as the dial tone forming circuit 51 provided in this telephone.

[0005]

However, the ringing tone output using such a circuit is a beeping tone that sounds like "beep", and there is a slight difference in tone color depending on the model. The sound was almost the same. Therefore,
When there are a plurality of people who carry mobile phones around, it was difficult to distinguish which phone was called.

For this reason, it is conceivable to provide a circuit for generating a ringing tone signal formed of a relatively complicated sound such as some melody and use the output signal from this circuit as the ringing tone. If a dedicated and relatively complicated circuit for outputting a ringing tone is provided, the configuration of the wireless telephone becomes complicated accordingly. In particular, in the case of a wireless telephone that is required to be compact and lightweight for portable use, it is not preferable to provide a dedicated circuit with a large circuit scale for outputting such a complicated ringing tone.

An object of the present invention is to enable the ringing tone of a wireless telephone to be set to an arbitrary tone with a simple structure.

[0008]

According to the present invention, when an incoming call is determined by the control data received by the receiving means, the predetermined compressed voice data stored in the storage means for storing the compressed voice data is used as the ring tone data. Is supplied to the decoding means.

According to this structure, by storing an arbitrary ringing tone in the storage means for storing compressed voice data provided in the wireless telephone, this arbitrary ringing tone can be used as a ringing tone when an incoming call arrives. .

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will now be described with reference to FIGS.
This will be described with reference to FIG.

A radio telephone to which the present invention is applied is a radio telephone that is small in size and is portable, and is capable of communicating with a base station by wirelessly transmitting digitalized voice data to and from the base station. It is a wireless telephone that makes a call with a connected station and wirelessly transmits voice data. For voice data, a vector sum excitation linear predictive coding method (VSELP: Vector-SumEx) is used.
It is transmitted as compressed audio data whose data amount is compressed by an encoding method called cited linear Predictive Coding).

The configuration of the wireless telephone of this example will be described with reference to FIG. 1. The antenna is provided with two antennas 1 and 2, and the antenna 1 is a reception-only antenna, and the antenna 2 is an antenna for both transmission and reception. Is. And antenna 1
The signal received at 1 is supplied to the front end circuit 5 through the open / close switch 3, and the signal received at the antenna 2 is supplied to the front end circuit 5 through the changeover switch 4 for switching between transmission and reception. In this case, the switches 3 and 4 supply to the front-end circuit 5 the reception signal of the antenna that can receive well.

Then, the front-end circuit 5 carries out high-frequency processing for frequency-converting a signal of a predetermined transmission channel into a first intermediate frequency signal. In this case, frequency conversion is performed using the frequency signal supplied from the frequency synthesizer 7. The output frequency of this frequency synthesizer 7 is
It is controlled by a control unit 20 which is a system controller for controlling the operation of this telephone.

Then, the first intermediate frequency signal output from the front end circuit 5 is supplied to the intermediate frequency circuit 6 to perform intermediate frequency processing such as amplification, and the frequency signal supplied from the frequency synthesizer 7 is used. Frequency conversion into a second intermediate frequency signal. Then, the second intermediate frequency signal is supplied to the data processing circuit 8 to perform demodulation processing of the reception data according to the transmission system to which the wireless telephone is applied, and to extract various reception data included in the demodulation signal. Perform data processing. Then, the audio data in the processed received data is supplied to the audio data encoding / decoding circuit 30. Further, the control data in the received data is supplied to the control unit 20 which controls the operation of each unit of this telephone. The control data supplied to the control unit 20 includes, for example, data indicating an incoming call to each terminal station (wireless telephone).

Then, the voice data encoding / decoding circuit 3
0 is a vector sum excitation linear prediction coding method (hereinafter VSE
(Referred to as the LP system), the audio data supplied from the data processing circuit 8 at the time of reception is decoded in accordance with the vector sum excitation linear predictive coding system to obtain a predetermined signal. System digital audio data (for example, the sampling frequency and the number of bits of one sample are constant digital audio data). Details of this decryption processing will be described later.

Then, the decoded digital audio data is supplied to the data processing circuit 8 and is supplied to the digital / analog converter 9 connected to the data processing circuit 8 to form an analog audio signal. Amplifier 10
The sound is supplied to the speaker 11 via the speaker to emit a sound.

Further, the audio data encoding / decoding circuit 30
A RAM 21, which is a memory for storing voice data, is connected to the VRAM, and voice data such as voice data received under the control of the control unit 20 or voice data for transmission is V
The data can be stored as it is encoded by the SELP method. In this case, the storage capacity of the RAM 21 is such that voice data corresponding to a call for several minutes can be stored.

Next, the structure of the transmission system will be described.
The sound picked up by the microphone 12 is supplied as an audio signal to the analog / digital converter 14 via the amplifier 13,
Convert to digital audio data. Then, the converted audio data is supplied to the audio data encoding / decoding circuit 30 via the data processing circuit 8 to be compressed audio data encoded by the VSELP method. Then, the compressed audio data is supplied to the data processing circuit 8, and the control data and the synchronization data supplied from the control unit 20 are added to form a data structure for transmission.

Then, the transmission data having the data structure for transmission is supplied to the modulation circuit 15 to be a transmission signal which is modulated for transmission and frequency-converted into a predetermined transmission channel. In this case, the frequency signal supplied from the frequency synthesizer 7 is used to perform frequency conversion processing to the transmission channel. Then, the transmission signal output from the modulation circuit 15 is supplied to the changeover switch 4 via the output amplifier 16 and wirelessly transmitted from the antenna 2 connected to the changeover switch 4. The gain when the output amplifier 16 amplifies the output control circuit 17 based on a command from the control unit 20.
It is set by the control of.

A RAM 21 and a memory of a ROM 22 are connected to the control unit 20 which is a system controller of the telephone, and the ROM 22 stores a control program necessary for controlling the telephone. Also R
The AM 21 is provided with an area in which data such as a telephone number that can be freely registered by the user can be stored and an area in which the above-described voice data can be stored. in this case,
In this example, a part of the area of the RAM 21 capable of storing voice data is used to store the ringing tone data. The ringing tone data is also stored as compressed voice data encoded by the VSELP method, like the voice data for communication. The ringing tone is formed by periodically and repeatedly outputting a tone of a relatively short time (about 1 second to several seconds).
In the AM 21, only this one cycle of voice data is stored as ringing tone data.

Then, when the ring tone data is registered in the RAM 21, and when the control unit 20 determines the incoming call to its own station based on the received control data, the RAM 2
1 or one cycle of ringing tone data stored in the ROM 22 is repeatedly read out periodically and supplied to the voice data encoding / decoding circuit 30. Then, in the voice data encoding / decoding circuit 30, the ringing tone data is converted into V
Decoding from the SELP system, and the decoded audio data is passed through the data processing circuit 8 to the digital / analog converter 9
Is supplied to the speaker 11 via the amplifier 10 and the analog voice signal of the ringing sound is repeatedly output as the ringing sound. And
Until the control unit 20 determines that the response to the incoming call is made by a key operation or the like (or until there is no incoming call, the output process of the ringing tone is continuously performed.

In the case of the telephone of this example, in addition to the ringing tone output process using the stored data of the RAM 21, the normal ringing tone output process, that is, a signal of a predetermined frequency is intermittently applied. When the RAM 21 is not registered with the ringing tone data, the normal ringing tone output process is performed. I am going to do it.

Further, this telephone is provided with a key 23 such as a dial number key and a display section 24 including a liquid crystal display panel and a drive circuit thereof, and operation information of the key 23 is stored in the control section 2.
0 is supplied to the display unit 24, and the operating state of the telephone is displayed on the display unit 24 under the control of the control unit 20.

Next, a configuration in which the decoding process is performed by the VSELP system in the audio data encoding / decoding circuit 30 of this example will be described with reference to FIG. This VSELP system is a code-excited linear prediction coding system (CELP: vector-quantization of excitation (residual) signal using a codebook).
Code Excited Linear Predictive Coding) is an improved coding method that uses a codebook of a predefined data structure to perform coding / decoding. First, received compressed speech data, which is speech data encoded by this method, includes short-term filter coefficient α _i , quantized long-term prediction coefficient β _q , quantization gain γ _q , quantum prediction lag L, and code word I.
(This code word is a word selected from a code book determined by the VSELP method). Then, by supplying the data of the codeword I to the codebook 31, this codeword is selected and the data of the codeword is output. This output data is supplied to the multiplier 32, multiplied by the quantization gain γ _q to obtain the data of the corresponding gain, and supplied to the adder 33.

Then, the output of the adder 33 is returned to the long-term filter state circuit 34 as long-term filter state data, and the long-term filter state circuit 34 obtains the output b _L (n) of the long-term filter state with respect to the quantum prediction lag L and multiplies it. This output b _L (n) is multiplied by the quantized long-term prediction coefficient β _q in the adder 35, and this multiplied data is supplied to the adder 33 to generate the excitation signal e _X (n ) Get.

Then, the excitation signal e _X (n) is supplied to the synthesis filter 37 via the pitch pre-filter 36,
Filtering is performed based on the short-term filter coefficient α _i, and the output of the synthesis filter 37 is processed by the spectrum filter 38 to obtain the output of audio data having a predetermined sampling frequency.

In the case of the wireless telephone of this example, the voice data thus decoded is supplied to the digital / analog converter 9 via the data processing circuit 8,
When the analog voice signal is obtained and the decoded voice is output from the speaker 11 and the ringing tone described above is output, the data read from the RAM 21 is processed by the voice data encoding / decoding circuit 30. It is decrypted and output from the speaker 11.

Next, the process of storing ringing tone data in the RAM 21 will be described. When the ringing tone data is stored, the voice signal input from the microphone 12 is stored in the RAM 21 in the RAM 21 while the control unit 20 sets the operation mode of the telephone to the ringing tone storage mode based on the operation of the key 23. Remember. That is, in the state where the ringing tone storage mode is set, the voice signal input from the microphone 12 is converted into the analog / digital converter 14
Is converted into a digital audio signal with the data processing circuit 8, and the digital audio signal is supplied to the audio data encoding / decoding circuit 30 via the data processing circuit 8 to be encoded by the VSELP method similar to the transmission. The encoded voice data is stored in the storage area for the ringing tone of the RAM 21.

Further, instead of the voice input to the microphone 12, the V obtained by the data processing circuit 8 after being received by the front end circuit 5 and the intermediate frequency circuit 6 is obtained.
The voice data encoded by the SELP method may be stored in the RAM 21 as ringing tone data.

Further, a voice signal input from a voice input terminal (not shown) provided separately from the microphone 12 may be coded by the VSELP method and stored in the RAM 21 as ringing tone data. In this case, the input terminal may be either a terminal for inputting an analog audio signal or a terminal for inputting audio data converted into digital data.

Next, the processing by the control of the control unit 20 when the ring tone is output by the wireless telephone of this example will be described with reference to the flowchart of FIG.

First, it is judged whether or not an incoming call to the own station is detected by the control data supplied to the control unit 20 (step 1).
01). When an incoming call to the own station is detected, R
It is judged whether or not ringing tone data is registered (stored) in the ringing tone storage area of the AM 21 (step 10).
2) If not stored, a normal ringing tone output process using a frequency signal or the like is performed (step 10).
3) Determine whether it is necessary to stop the ringing tone by responding to the incoming call by some key operation, or because the incoming call is no longer called.
04). If it is not necessary to stop the ringing tone, the ringing tone output process in step 103 is continuously performed, and if it is determined in step 104 that the ringing tone needs to be stopped, the process proceeds to step 105. The process is moved to stop the ringing tone, and step 101
Returning to the judgment, wait until the next incoming call.

When it is determined in step 102 that the ringing tone data is registered in the RAM 21, the registered ringing tone data is read from the RAM 21 (step 111). Then, the read data is supplied to the audio data encoding / decoding circuit 30, and V
Decoding by the SELP method is performed (step 11
2) A process of converting the decoded voice data into an analog voice signal and outputting it from the speaker 11 is performed (step 113). Then, it is judged whether or not it is necessary to stop the ringing sound by responding to the incoming call by some key operation or the like, or the call by the incoming call is lost. Then, when it is not necessary to stop the ringing tone, the steps 111 to 11 are performed.
If the ringing tone output process up to 3 is continuously performed and it is determined in step 114 that the ringing tone needs to be stopped, the process proceeds to step 105, the ringing tone is stopped, and the determination in step 101 is performed. Return to and wait for the next incoming call.

By performing the processing for outputting the ringing tone in this way, it becomes possible to use any tone color, melody, voice, etc. registered by the user of this telephone as the ringing tone. In this case, since the audio data is stored as compressed audio data in the same format as the received audio data, the audio data encoding / decoding circuit 30 which is a processing circuit for transmission / reception is used to compress the compressed audio data. Can be used as the ringing tone, and there is no need for a dedicated processing circuit for outputting the ringing tone that is registered arbitrarily,
The circuit configuration can be simplified. In addition, RAM21
As for the storage state of the ringing tone data to be stored as compressed and encoded voice data, a very small storage capacity is required, and a small capacity of the RAM 21 prepared for storing the voice communication. Can be dealt with by simply using, and the configuration of the telephone is not complicated in this respect. For example, only the capacity for storing the voice data for several seconds, out of the RAM 21 having the capacity for storing the voice data for several minutes, may be used as the ringing tone area.

Also, when the ringing tone data is stored, the ringing tone data is specially encoded by encoding the ringing tone data by using the compressed voice data by the circuit 30 that performs the encoding process at the time of transmission. Any ring back tone data can be registered without the need for a circuit.

In the above embodiment, the ringing tone data registered in the RAM is described as one type, but the ringing tone data of a plurality of types is stored in the RAM so that the ringing state can be changed. In response, control may be performed so as to output a predetermined ringing tone from the stored ringing tones.

Further, in the above-mentioned embodiment, the RA for storing the call voice is used as the storage means for storing the data of the ringing tone.
Although a part of the area of M is used, other storage means included in the wireless telephone may be used. However, since the wireless telephone is a device driven by a battery, it is not preferable to use a memory that erases the stored contents when the battery runs out. Therefore, it is preferable to use a non-volatile memory or a memory provided with a dedicated backup battery.

In the above embodiment, the VSELP system is applied by processing the audio data by compressing and encoding it.
If the encoding method of voice data used for transmission in a wireless telephone system using a wireless telephone is another method, store the voice data compressed by the encoding applied to that telephone in the memory. Good.

Further, in the above-mentioned embodiment, the RA which is a memory in which the voice data arbitrarily registered by the user can be written
I tried to store it in M, but when manufacturing this phone,
The ROM, which is a read-only memory, stores in advance one type or a plurality of types of ringing tone data (encoded data), and the ringing tone data is stored in this ROM. You may make it generate | occur | produce.

[0040]

According to the present invention, by storing an arbitrary ringing tone in the storage means for storing compressed voice data provided in the wireless telephone, this arbitrary tone color, melody, voice, etc. can be used as the ringing tone. become. In this case, since the compressed voice data is stored as compressed voice data in the same format as the received voice data, the compressed voice data can be used as a ringing tone by using the decoding means provided in this telephone. The ring tone can be output using the circuit provided for processing the voice data received by the telephone, the dedicated processing circuit for the ring tone is not required, the circuit configuration can be simplified, and the ring tone can be generated. The storage capacity of the storage means for storing as data can be reduced, and the storage means with the minimum capacity can be used.

In this case, as the compressed voice data used as the ringing tone data, the voice data input to the voice input means of this telephone is stored in the storage means as the compressed voice data by the encoding means for transmission. Since it is data, compressed voice data for ringing tone is created using the processing circuit for transmission that this telephone has, and even when storing ringing tone data, a dedicated circuit is not required. I can deal with it.

Since the storage means also serves as a storage means for storing the call voice, in the case of a wireless telephone having a storage means for storing the call voice, a part of this storage means is used. It can be dealt with only by using the area, and it is not necessary to provide a dedicated storage means.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing a wireless telephone to which an embodiment of the present invention is applied.

FIG. 2 is a configuration diagram showing an audio data decoding unit according to an embodiment.

FIG. 3 is a flowchart showing a ringing tone output process of one embodiment.

FIG. 4 is a configuration diagram showing a configuration for outputting a conventional ringing tone.

[Explanation of symbols]

 8 data processing unit 9 digital / analog converter 10 amplifier 11 speaker 20 control unit 21 RAM 30 voice data encoding / decoding unit

Claims (3)

[Claims] 1. A radiotelephone for making a call with a station on the other side connected by a radiotelephone line, receiving means for receiving data transmitted by the radiotelephone line, and compression in the data received by the receiving means. Decoding means for decoding the audio data, output means for outputting the audio data decoded by the decoding means, storage means for storing the compressed audio data and supplying the stored data to the decoding means. A radio telephone provided with a control means for supplying predetermined compressed voice data stored in the storage means to the decoding means as ringing tone data when an incoming call is determined by the control data received by the receiving means. . 2. The compressed voice data to be used as the ringing tone data is the voice data input to the voice input means of the telephone set, stored in the storage means as the compressed voice data by the encoding means for transmission. The wireless telephone according to claim 1, wherein the wireless telephone is data that has 3. The wireless telephone according to claim 1, wherein the storage unit also serves as a storage unit for storing call voice.