RU2273962C2 - Method for inserting acoustic series - Google Patents

Abstract

FIELD: technology for inserting acoustic series into speech channel provided for mobile communication network client through radio-communication interface.

SUBSTANCE: of several transmission modes determined on interface, transmission mode for utilization on speech channel is selected, acoustic series with capability for insertion is stored in multiple data blocks with compression, level of compression of which is appropriate for compression level of at least one of transmission modes, while for inserting acoustic series into speech channel for radio-communication interface of multiple stored blocks of data with compression the data block is elected and inserted into speech channel, compression level of which is appropriate for current compression level utilized in speech channel.

EFFECT: improved efficiency of aforementioned insertion through radio-communication interface, wherein a change may occur between several transmission modes, different by compression levels.

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Description

The invention relates to devices and methods for inserting an acoustic sequence into a voice channel of a radio interface of a mobile radio communication network provided for a user of a mobile radio network.

In the speech channel of the radio interface of the mobile radio network, the user's speech is transmitted in a compressed form (for example, by means of an AMR codec in the UMTS system (Universal Mobile Communication System). The AMR codec contains an algorithm that compresses speech samples of 20 ms in length in accordance with the following 8 modes with bit rates: AMR mode 7 = 12.2 kbit / s, AMR mode 6 = 10.2 kbit / s, AMR mode 5 = 7.95 kbit / s, AMR mode 4 = 7.40 kbit / s, AMR mode 3 = 6.70 kbit / s, AMR mode 2 = 5.90 kbit / s, AMR mode 1 = 5.15 kbit / s, AMR mode 0 = 4.75 kbit / s .

The radio network controller (DAC) (or base station controller) of the mobile radio network prior to establishing a voice connection (for example, UMTS) negotiates with the network switch a set of AMR modes through which the voice connection should be made. During connection establishment or during the existence of a connection, the DAC may require changing the current AMR mode by eliminating the agreed modes. Such a change in the AMR mode can also occur during the reproduction of acoustic sequences, tonal or transmitted messages in the switch.

An object of the present invention is to enable the effective insertion of acoustic sequences into a conversation of mobile users via a radio communication interface, in which a change can occur between several transmission modes differing in correspondingly different degrees of speech compression. This problem is solved by the features of the independent claims.

In accordance with the invention, when changing the permitted transmission modes, a quick, simple and effective embedding of tones and messages in a conversation is provided. Transcoding before playing them is not required.

Particularly preferred embodiments follow from the dependent claims.

It is advisable to reproduce the acoustic sequence in all transmission modes that can be selected, save, which allows for all possible transmission modes in accordance with the invention to facilitate the insertion of acoustic sequences.

The compressed data blocks are preferably stored in a mobile network switch through which user voice sequences are transmitted, from where easy access is provided.

Other features and advantages of the invention are reflected in the claims and the following description of an exemplary embodiment with reference to the drawings, in which the following is presented:

figure 1 - schematic representation of voice over the voice channel of the radio interface of the mobile radio network, provided for the subscriber of the mobile radio network,

figure 2 is a schematic representation of the introduction of an acoustic sequence (message, tone, etc.) into the speech connection of a mobile radio subscriber.

Figure 1 shows the subscriber 2 with a mobile station 1, a node B (base station), a radio network controller (DAC) 20, a radio communication interface 4, a first switch 5, another switch 6, another node B and another DAC, as well as another subscriber 7, uncompressed speech sequences 8 of subscriber 2, compressed sequences 9 of subscriber 2, memory 10, with at least one acoustic sequence 11-18 stored as a data block (with the same speech content or tone, but with different degrees of compression of the speech content or tones), of which one dol to be transmitted via the radio interface to the subscriber 4 2.

Figure 2 shows several time fragments (sequences "1", "m-1", "last") from a tone or message sent to a subscriber compressed in a compressed form via a voice channel of a radio communication network of a mobile radio communication network for two subscribers 2, 7 of one or more telecommunication networks.

Sequence 1 is presented with a first compression ratio (used in the first transmission mode) in the form of a data block A1 (reference position 11 in FIG. 1), with a second compression ratio (used in the second transmission mode) in the form of a data block B1 (reference position 13 on 1) and with a third compression ratio (used in the third transmission mode) as a data block C1 (reference numeral 18 in FIG. 1). The time axis is indicated by an arrow.

The data block A1 is shorter than sequence 1, since A1 represents compression (performed by a known compression method, for example AMR) of the contents of sequence 1. Data block B1 is shorter than sequence 1, and shorter than data block A1, since B1 represents stronger compression the contents of sequence 1 than A1. The data block C1 is shorter than the sequence 1, and shorter than the data block A1, and shorter than the data block B1, since C1 represents a stronger compression of the contents of sequence 1 than A1 and B1.

Stronger compression can be applied, for example, with higher transmission channel quality and / or lower quality requirements.

In a switch (a channel or packet switch; a mobile switching center (MSC) or a media gateway), for example, a linearized signal sampled at a frequency of 8 kHz or encoded according to A-law at a speed of 64 kbit / s of a subscriber signal, speech samples 1 ( temporary fragments of a conversation) lasting 20 ms are converted (i.e. transcoded) into the current actual transmission mode (for example, AMR mode) A, or B, or C.

When establishing a voice channel between the DAC and the switch for transmitting the voice signals 1, 8 of the subscriber, the (one or several) transmission modes A, B, C to be applied are preselected (agreed), from which, when communicating between the subscribers, the corresponding current one (for example, at a given moment or at some specific point in time) the transmission mode A, or B, or C. to be applied.

For example, 8 transmission modes are possible (AMR mode, etc.), from which 3 transmission modes A, B, C are preselected (matched) (corresponding to “AMR modes 7, 5, 0” according to FIG. 2). When introducing an acoustic sequence into a conversation that, for example, is currently using transmission mode A, messages (notifications) are entered in the same transmission mode A, thus, for example, in this case, packet A1 contains a message instead of a time fragment from a subscriber’s conversation, compressed in transmission mode A. Since at least one message in all possible (for example, 8) transmission modes is stored in a compressed form, to enter a message you only need to select the message (from 11-18), the compression of which corresponds to t the current compression used in the speech channel (for example, A, corresponding to AMR mode 1).

Example

Tones and messages are stored in memory 10 in FIG. 1, such as, for example, 8 compressed data blocks (samples 11-18) transcoded into all 8 AMR modes.

The samples thus obtained have a length of, for example, 20 ms (the message may have several consecutive samples 11 with the same or different compression) and are loaded onto the switch in a centralized manner. The number of samples per tone or message is always the same and differs only in bytes per 20 ms sample. DAC agreed with switch 5, for example, a set of modes, consisting of the following AMR modes:

Mode A = 12.20 kbit / s with 244 bits or 31 bytes (including bit filling) for 20 ms speech sampling.

Mode B = 7.95 kbps with 159 bits or 20 bytes (including padding) for 20 ms speech sampling.

Mode C = 4.75 kbps with 95 bits or 12 bytes (including bit filling) for 20 ms speech sampling.

When a tone or message is to be entered, the current valid AMR mode is first determined and the related sample number 11 is selected and transmitted, for example, in mode A. Then the next sample with number 2, and so on, is sent accordingly in the same mode BUT.

After the N-1 sample was sent in mode A, the DAC removes this current valid mode A and mode B from the existing set of modes in order to initiate a mode change. As a result, to transmit the next sample N, a change to the next possible mode C must occur. After that, a sample with the number n-1 from the corresponding sequence of samples (transcoded to the new mode C to be applied) is sent for this tone or this message.

Since in this method it is only necessary to control the sample to be transmitted, and constant transcoding is not required, it is possible to respond with minimal cost to change the AMR modes in the switch. This method is also applicable to other types of codec, in particular, when in the case of such a codec, only samples of the same length are always transcoded.

Claims (11)

1. The method of inserting the acoustic sequence (11; 12; 13; 15; 16; 17; 18) into the speech channel of the radio communication interface (4) of the network (4, 3) provided for the subscriber (2) of the mobile radio network (4, 3, 5) , 5) mobile radio communication, namely, that from several transmission modes defined on the radio interface by varying the compression ratio of the transmitted speech sequences (8) of the subscriber (2), select (3, 5) the transmission mode for use in the speech channel, the insertionable acoustic sequence is stored in a plurality of data blocks (11; 12; 13; 15; 16; 17; 18) with compression, the compression ratio of which corresponds to the compression ratio of at least one of the transmission modes, at the same time, to insert the acoustic sequence (11; 12; 13; 15; 16; 17; 18) into the speech channel of the radio communication interface (4) from the set of stored data blocks (11; 12; 13; 15; 16; 17; 18) with that data block (11) is selected and introduced into the speech channel by compression, the compression ratio of which corresponds to the current compression ratio used in the speech channel. 2. The method according to claim 1, characterized in that for the voice channel (4) several applicable transmission modes are preselected, of which during communication of one subscriber (2) of the mobile radio network (4, 3, 5) with another subscriber ( 7) the mobile radio network or fixed network (6) selects the current transmission mode to be applied, respectively. 3. The method according to claim 1, characterized in that the currently selected transmission mode is the current applied transmission mode or one of the block of allowed transmission modes that has the highest transmission rate. 4. The method according to claim 1, characterized in that the inserted acoustic sequence is stored in all selectable transmission modes (11; 12; 13; 15; 16; 17; 18). 5. The method according to claim 1, characterized in that the voice sequences of the subscriber (2) represent the conversation of the subscriber (2) with another subscriber (7) of the telecommunications network (6). 6. The method according to claim 1, characterized in that the acoustic sequence (11; 12; 13; 15; 16; 17; 18) contains a message. 7. The method according to claim 1, characterized in that the acoustic sequence (11; 12; 13; 15; 16; 17; 18) contains a tone. 8. The method according to claim 1, characterized in that the data blocks (11; 12; 13; 15; 16; 17; 18) with compression are an acoustic sequence of the same length, but because of their different degree of compression, the acoustic sequence has a different bit length. 9. The method according to claim 1, characterized in that the data blocks (11; 12; 13; 15; 16; 17; 18) with compression are stored in the switch (5) of the mobile radio network through which the voice sequences (8) of the subscriber are transmitted (2). 10. The method according to claim 1, characterized in that the transmission modes (11; 12; 13; 15; 16; 17; 18) are respectively codec modes, in particular AMR codec modes. 11. A device (5, 11) for inserting an acoustic sequence (11; 12; 13; 15; 16; 17; 18) into a voice channel of an interface (4) applicable to a subscriber (2) of a mobile radio network (4, 3, 5) a radio communication network (4, 3, 5) of a mobile radio communication containing a device (5) for selecting a transmission mode for use in a speech channel of a radio communication interface (4) from several transmission modes defined on the radio communication interface by varying the compression ratio of the transmitted speech sequences (8) of the subscriber (2) and acoustic sequences, memory (10) for many data blocks (11; 12; 13; 15; 16; 17; 18) with compression, representing the same acoustic sequence for insertion, compression ratio (11; 12; 13; 15; 16; 17 ; 18) which corresponds to the compression ratio of at least one of the transmission modes of the radio interface (4) of the mobile radio communication network, a device (5) for inserting an acoustic sequence (11) into the speech channel of a radio communication interface (4) in the form of a data block (11) with compression from a plurality of stored (10) data blocks (11; 12; 13; 15; 16; 17; 18 ) with compression, the compression ratio of which corresponds to the current compression ratio used in the speech channel.

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